MACRO-EDGE
Table of Contents
TECHNICAL SPECIFICATIONS
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PARTICULAR PROJECT REQUIREMENTS
1.0
General
5
1.1
Scope of this Division
5
1.2
Particulars of the Works Scope
5
1.3
Submittals
6
1.4
Quality Assurance
7
1.5
Definitions and Abbreviations
7
1.6
Equipment and Materials
8
1.7
Shop Drawings, Calculations, Product Data and Samples
9
1.8
Reviews
9
1.9
Fees
10
1.10
Shop Drawings & Product Data
10
1.11
Contractors Coordination Drawings
11
1.12
Coordination of Work
12
1.13
Cutting and Patching
13
1.14
Responsibility for Evaluation
13
1.15
Fire Access to Fire Apparatus
14
1.16
Equipment Pad and Anchor Bolts
14
1.17
Delivery, Rigging and Hauling
14
1.18
Equipment and Material Protection
14
1.19
Electrical Equipment and Electrical Room Precautions
15
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2.0
1.20
Equipment Guards
15
1.21
Lubrication
15
1.22
Date of Completion and Testing of the Air Conditioning Systems
15
1.23
Operating Instructions
16
1.24
Operating and Maintenance Books
16
1.25
Record Drawings
16
1.26
Certification
17
1.27
Final Review
17
1.28
Early Occupancy
18
1.29
Relevant Regulations and Standards
18
Products
2.1
18
AIR-CONDITIONING UNITS
18
1. Air-cooled Split Type Fan coil Units
19
2. Air-Cooled Condensing Unit
20
2.2
21
REFRIGERANT PIPING
1. Standard Commercial Products
21
2. Electrical Works
21
3. Refrigerant Piping System
22
4. Pipe, Fittings and End Connections (Joints)
22
5. Valves
22
6. Piping Accessories
24
7. Fabrication
25
2.3
26
FANS
1. Centrifugal Fans
26
2. Axial Flow Propeller Fans
28
3. Axial Flow Aerofoil Fans
28
2.4
29
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VIBRATION ISOLATOR
2.5
PIPE HANGERS, SUPPORTS AND ANCHORS
30
2.6
SOUND ATTENUATION
30
1. Acoustic Insulation
30
2. Sound Attenuators
31
2.7
31
INSULATION
1. General
31
2. Duct Insulation
31
3. Piping Insulation
32
4. Vapour Barrier
33
5. Sealing of Joints
33
6. Adhesives
33
2.8
ACCESS DOORS
34
2.9
FIRE STOPPING
34
1. Firestops
34
2. Damming Material
35
3. Materials
35
2.10
35
SHEET METAL
1. Sheet Metal Ductwork
35
2. Sheet Metal Ductwork Design
36
3. Fire Rated Ductwork
36
4. Kitchen Exhaust Ductwork
36
5. Outdoor Ductwork
37
6. Joints 37
7. Flexible Connections
37
8. Splitters
37
2.11
38
DAMPERS
1. Butterfly Opposed Blade Dampers
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38
3.0
2. Motorised Volume Control Dampers
38
3. Fire Dampers
38
4. Pressure Relief Dampers
39
5. Non-Return Dampers (Back draft dampers)
39
2.12
39
AIR OUTLETS AND INLETS
1. Linear Diffusers
39
2. Adjustment and Measurement Unit Specification
39
3. Toilet Exhaust
40
4. Ceiling Diffusers
40
5. Wall Grille
40
6. Access Doors – General
40
7. Kitchen Hood
40
EXECUTION
40
3.1
Examination
40
3.2
Installation
40
3.3
Cleaning of Systems
41
3.4
Safety Procedure
41
3.5
Refrigerant Piping Tests
41
3.6
Testing of HVAC Systems
41
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PARTICULAR PROJECT REQUIREMENTS
1.0
General
1.1
Scope of this Division
1. This division shall include the design, supply, packing for transport, delivery to site,
unloading, installation, connecting, final testing and putting into commission, handingover in approved working order and maintenance during the maintenance period of
the air conditioning and mechanical ventilation system. This includes the whole of the
Works, as detailed hereunder.
2. The works to be carried out under this division shall include the whole of the materials,
and all necessary labour for the completion of the Works, in every detail, ready for
continuous and economic operation whether such be directly mentioned in the
specifications or not.
3. The Contractor shall apply for and obtain all necessary permits, certificates and
approvals for the work done from the relevant authorities and shall lodge the same
with the Employer’s Representatives (E.R.) before final payment is made.
1.2
Particulars of the Works Scope
1. Design, supply, manufacture, test at Works, deliver to site, test and commission at site,
service and maintain the complete Air Conditioning and Mechanical Ventilation
Services.
2. Provide all labour, materials, equipment, tools, appliances, auxiliaries, services,
hoisting, scaffolding, support, supervision, and perform all operations for the
furnishing, installation, testing, commissioning, service and maintenance of the
complete Air Conditioning and Mechanical Ventilation Services.
3. The works of this package shall include co-ordination with other Works Contractors so
as to provide a Complete, Operational and Acceptable Air Conditioning and Mechanical
Ventilation Services.
4. The works to be included in this Section shall cover but not limited to the following
items:a. Control Panels
b. Automatic Controls
c. Electric Motors
d. VFD Compartment Units (Variable Frequency Drive)
e. Power Cabling and Control Cabling
f.
Cable Support System
g. Painting and Labeling
h. Building Control System (BCS) Interface
i.
Fire Alarm System (FAS) Interface
j.
Instruments
k. Dampers
l.
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Air Inlets and Outlets.
6/19/23
m. Vibration Isolation
n. Sound Attenuation
o. Firestopping
p. System Identification
q. Fans
r.
Variable Air Volume Fan Coil Units and Air Cooled Condensing Units
s. Split Type Air-conditioning
t.
Window type Air-conditioning Units
u. Air Filters
v. Piping and Accessories
w. Pipe Hangers, Anchors and Support
x. Valves
y. Piping Specialties
z. Inspect and witness testing and site testing, adjusting, commissioning and
handing over.
aa. Testing & Commissioning is to be headed by a Commissioning Company with
adequate experience.
bb. Service and Maintenance for twelve (12) months.
cc. Equipment supports for Air Conditioning and Mechanical Ventilation Services.
dd. Electrical power, water and fuel consumed during the supply, installation,
testing and commissioning of the system.
ee. Sealing of sleeves and other electrical openings.
ff. Shop drawings, construction/installation drawings and installation manuals.
gg. All Authorities approvals.
hh. As-built reproducible tracings, AutoCAD drawing files and operation and
maintenance manuals.
ii. Adequate instructions and Training for Employer’s Representatives.
1.3
Submittals
1. Submit all shop drawings, manufacturer's data, samples and test reports as called for
hereinafter.
2. Submit a single guarantee stating that all parts of the work are in accordance with
Contract requirements. Guarantee work against faulty and improper material and
workmanship for a period as specified elsewhere in the contract from date practical
completion, except that where guarantees or warranties for longer terms are specified
herein, such longer term to apply. Within 24 hours after notification, correct any
deficiencies which occur during the guarantee period at no additional cost to the
Employer (Owner), to the satisfaction of the E.R. Obtain similar guarantees from
manufacturers, suppliers and other specialists.
Page 6 of 42
3. Indemnify the Employer and the E.R. against loss, liability, damage or expense,
including attorneys' fees, in connection with any claim resulting from damage which
may be asserted by any third party.
1.4
Quality Assurance
1. Comply with current governing codes, ordinances and regulations, as well as with
requirements and all other applicable codes.
2. Comply with the requirements of agencies or authorities having jurisdiction over any
part of the work and secure all necessary permits.
3. Where codes or standards are listed herein, the applicable portions apply.
4. Plans, specifications, codes and standards are minimum requirements. Where
requirements differ, apply the more stringent.
5. Should any change in plans or specifications be required to comply with governing
regulations, notify the Owner’s Representatives at the time of submitting this bid.
6. Execute work in strict accordance with the best practices of the trades in a thorough,
substantial, workmanlike manner by competent workmen. Provide a competent,
experienced full-time Superintendent who is authorized to make decisions on behalf of
the Contractor.
1.5
Definitions and Abbreviations
1. Definitions
a.
"PROVIDE" means to supply, purchase, transport, place, erect, connect, test
and turn over to Employer, complete and ready for regular operation, the
particular work referred to.
b.
"INSTALL" means to join, unite, fasten, link, attach, set up or otherwise
connect together before testing and turning over to Employer, complete and
ready for regular operation, the particular work referred to.
c.
"FURNISH" means to supply all materials, labour, equipment, testing
apparatus, controls, tests, accessories and all other items customarily
required for the proper and complete application for the particular work
referred to.
d.
"AS DIRECTED" means as directed by the Employer’s Representatives.
e.
"CONCEALED" means embedded in masonry or other construction, installed
behind wall furring or within double partitions, or installed within hung
ceilings.
f.
"SUBMIT" means submit to Employer’s Representatives for review. Refer to
Project GeneraI and Special Conditions for proper procedures.
2. Abbreviations
Page 7 of 42
a. ARI
American Refrigeration Institute
b. ANSI
American National Standards Institute
c. ASHRAE
Engineers
American Society of Heating, Refrigeration and Air Conditioning
d. ASME
American Society of Mechanical Engineers
e.
American Society for Testing Materials
ASTM
f.
1.6
ASA
Acoustical Society of America
g. lSO
International Standards Organisation
h. NFPA
National Fire Protection Association
i.
Underwriters Laboratories
UL
Equipment and Materials
1. If products and materials are specified for a specific item or system, use those products
or materials. If products and materials are not listed in either of the above, use first
class products and materials, subject to approval of the Employer.
2. Provide products and materials that are new, clean, free of defects and free of damage
and corrosion.
3. Replace materials of less than specified quality as designated by the Employer and
relocate work incorrectly installed as determined by the E.R.
4. Provide name/data plates on all components of equipment with manufacturer's name,
model number, serial number, capacity data and electrical characteristics attached in a
conspicuous place.
5. lnstall materials and equipment with qualified trades’ people.
6. Maintain uniformity of manufacture for equipment used in similar applications and
sizes.
7. Applicable equipment and materials to be approved by local authorities having
jurisdiction.
8. Fully lubricate equipment when installed.
9. Do not operate air systems until ductwork is complete, temporary filters are in place
and construction debris’ are removed. Provide one-inch thick fiberglass filter media
across the face of each return air opening prior to start of each air system during
temporary system operation and system clean-out.
10. Locate all floor mounted equipment on concrete plinths. Concrete works to be
provided by another section of the specifications (Structural specifications).
Coordinate size and location with division providing concrete plinths.
11. Secure equipment with bolts, washers and locknuts of ample size to support
equipment. Embedded anchor bolts to have bottom plate and pipe sleeves. Grout
machinery set in concrete under the entire bearing surface. After grout has set,
remove wedges, shims and jack bolts and fill space with grout.
12. Locate valves, traps, damper operators, access doors, etc. to be easily accessible, either
in mechanical spaces or through access panels as specified hereinafter, or as required.
Coordinate and obtain Employer’s approval of access panel locations.
13. Follow manufacturer’s instructions for installing, connecting, and adjusting equipment.
Provide one copy of such instructions to the Employer before installing any equipment.
Provide a copy of such instructions at the equipment during work on the equipment.
14. Equipment capacities, etc., are scheduled or specified for job site operating conditions.
Equipment sensitive to altitude shall be derated with the method of derating identified
on shop drawings.
15. Where factory testing or equipment is required to ascertain performance and
attendance by the E.R. is required to witness test, associated travel costs will be borne
Page 8 of 42
by the Contractor. Witness testing by the E.R. does not relieve the contractor of the
requirements of the contract documents.
1.7
Shop Drawings, Calculations, Product Data and Samples
1. Shop drawings, calculations, project data sheets and samples shall be submitted with
Project General and Special Conditions.
2. Within one (1) month after notice to proceed by the E.R., or after execution of
Employer/Contractor Agreement, submit to the E.R. for review, a complete typed list
of all mechanical equipment manufacturers and material suppliers for the equipment
intended to be furnished and installed on this project. The submission shall be in
stages and provide sufficient time for review before confirmation of procurement.
3. Within two (2) months after notice to proceed by the E.R., prepare an index of all
submittals for the project. Include a submittal identification number, a cross-reference
to the Specification sections or Drawing number, and an item description. Prefix the
submittal identification number by the Specification sections to which they apply.
Indicate on each submittal, the submittal identification number in addition to the
other data specified.
4. After the Contractor is awarded, obtain complete shop drawings, calculations, product
data and samples from the manufacturers, suppliers, vendors, and all other parties, for
all materials and equipment as specified herein in various sections of the specification.
Submit data and details of such materials and equipment for review by the E.R. Prior
to submission of the shop drawings, product data and samples to the E.R., review and
certify the shop drawings, product data and samples are in compliance with the
Contract Documents. Further, check all materials and equipment upon their arrival on
the job site and verify their compliance with the Contract Documents. Modify any
work which proceeds prior to receiving accepted shop drawings as required to comply
with the Contract Documents and the shop drawings, at no cost to the project.
5. Prior to fabrication or installation of any work, completely coordinate all work and
prepare a complete set of Coordination Drawings.
6. The Employer reserves the right to employ an independent consultant to inspect,
review, or judge the progress and performance of the Contractor.
7. Calculations shall be submitted in detail and full. Calculations shall be for the whole
system. Worst-case calculation only is not adequate. Critical or computational points
referred to in the calculations sheet shall be clearly indicated on the shop drawings.
For calculation performed by computer programme, full detail of the software shall be
submitted for review and approval, this shall include, but not limited to, software
version, accuracy of calculation, number of iterations, computational steps and track
record of software writer. Source of reference, formulas, charts, tables etc. shall be
submitted as appendix to the calculations. Calculations shall be submitted together
with the shops drawings and one complete set of calculations shall accompany each
set of shop drawings. Submission of shops drawings without complete calculations will
not be reviewed.
1.8
Reviews
1. E.R.'s review is for general compliance with the design concept and contract
documents. Markings or comments or the lack thereof does not relieve the Contractor
from compliance with the project plans and specifications. The Contractor remains
solely responsible for details and accuracy, for confirming and correlating all quantities
and dimensions, for selecting fabrication processes, for techniques of construction, for
Page 9 of 42
performing his work in a safe manner, and for coordinating his work with that of other
Divisions of this Specification.
2. No part of the work shall be started in the shop or in the field until the E.R. have
reviewed the shop drawings and samples for that portion of the work.
3. A minimum period of twenty (20) working days, exclusive of transmittal time, will be
required by the E.R. each time a shop drawing, product data and/or samples are
submitted for review. This time period must be considered by the Contractor when
scheduling his work.
4. Submit five (5) prints of all sheet metal and piping drawings. Submit sufficient copies of
original catalog cuts (to ER requirement) with minimum of five (5) copies of catalog
cuts.
5. Submissions will be stamped as follows:
a. Reviewed and Accepted - Fabrication, manufacture or construction may
proceed providing submittal complies with the Contract Documents.
b. Reviewed with Correction - Work may proceed as above so long as the E.R.'s
notations are complied with.
c. Not Accepted. The submittal does not comply with the Contract Documents;
do not proceed with fabrication, manufacture or construction. The work and
shop drawings are not permitted at the job site. Resubmit appropriate shop
drawings.
6. The Employer reserves the right to employ an independent consultant to inspect,
review or judge the progress and performance of the contractor.
1.9
Fees
1. Pay all required fees, taxes, duties and other surcharges.
2. Pay royalties or fees required in connection with the use of patented devices and
systems.
1.10
Shop Drawings & Product Data
1. Submit materials and equipment by manufacturer, trade name and model number.
Include copies of applicable brochure or catalog material. Do not assume applicable
catalogs are available in the E.R.'s office. Maintenance and operating manuals are not
suitable substitutes for shop drawings.
2. Identify each sheet of printed submittal pages (using arrows, underlining or circling) to
show applicable sizes, types, model numbers, ratings, capacities and options actually
being proposed. Cross out non-applicable information. Note specified features such
as special linings, seals, materials or painting.
3. Include dimensional data for roughing in and installation, technical data sufficient to
verify that equipment meets requirements of drawings and specifications. Include
wiring, piping and service connection data, motor sizes complete with voltage ratings
and schedules.
4. Maintain a complete set of reviewed and stamped shop drawings and product data on
site (at the work locations).
Page 10 of 42
5. Prepare and submit detailed shop drawings for piping work and other distribution
services of suitable scale, including locations and sizes of openings in floor, walls and
roofs.
6. The Contractor is not relieved of the responsibility for dimensions or errors that may
be contained on submissions reviewed by the E.R., or for deviations from requirements
in the Contract Documents. Understand clearly that the E.R.'s noting some errors but
overlooking others does not grant the Contractor permission to proceed in error.
Regardless of any information contained in the shop drawings, product data and
samples, the Contract Documents govern the work and are neither waived nor
superseded in any way by the review of shop drawings, product data and samples.
7. Inadequate or incomplete shop drawings, product data and/or samples will not be
reviewed by the E.R. and will be returned to the Contractor for re-submittal.
8. Indicate in the lower right hand corner of each shop drawing, and each product data
brochure on the front cover, the following: The submittal identification number; title
of the sheet or brochure; name and location of the Project; names of the E.R.,
Contractor, manufacturer, supplier, and vendor; the date of submittal; and the date of
each correction and version and revision. Number all pages and drawings in product
data brochures consecutively from beginning to end. Unless the above information is
included, the submittal will be returned for resubmission. Include with resubmittals of
product data or brochures a cover letter summarizing the corrections made in
response to the review comments and the submittal page numbers which were
revised.
1.11
Contractors Coordination Drawings
1. Coordinate efforts and furnish, in writing, any information necessary to permit the
work of all Divisions to be installed satisfactorily and with the least possible
interference or delay.
2. Prepare a complete set of construction Coordination Drawings indicating the
equipment actually purchased and the exact routing for all lines such as piping,
busway, conduit, ductwork, etc., including conduit embedded in concrete. Use the
sheetmetal shop drawings as the base drawings to which all work will be shown.
Complete each Coordination Drawing prior to the installation of the work in the area
covered by the specific drawing.
3. Indicate piping loads and support points for all piping, racked piping, racked conduit,
and busway, and submit to the E.R. for review and approval. Indicate the elevation,
location, support points, static, dynamic and expansion forces and loads imposed on
the structure at support, anchor points, and size of all lines. Indicate all beam
penetrations and slab penetrations sized and coordinated. Indicate all work routed
underground or embedded in concrete by dimension to column and building lines.
4. This requirement for Coordination Drawings is not authorization to make any
unauthorized changes to the Design/ Contract Drawings. Maintain all Design Drawing
space allocations such as ceiling height, 200 mm high zone directly above the ceiling
for tenant build-out and flexibility, chase walls, equipment room size, etc., unless prior
written authorization is received from the E.R. to change them.
5. Work installed which interferes with work of any other Division of this Specification
shall be corrected at no cost to the project.
Page 11 of 42
1.12
Coordination of Work
1. The plans show the general arrangement of equipment, ductwork, piping and
appurtenances. Follow these drawings as closely as the actual construction and the
work of other Divisions of this Specification will permit. Provide offsets, fittings, and
accessories which may be required but not shown on the drawings. Investigate the
site, structural and finish ground conditions affecting the work, and arrange the work
accordingly. Provide such work and accessories as may be required to meet such
conditions, at no additional cost to the project.
2. Certain materials will be provided by other specification divisions. Examine the
Contract Documents to ascertain these requirements.
3. Carefully check space requirements to insure that material can be installed in the
spaces allotted thereto with sufficient access space, including finished suspended
ceilings.
4. Wherever work interconnects with work of other specification divisions, coordinate
with those divisions to insure that they have the information necessary so that they
may properly install the necessary connections and equipment. Identify items (valves,
dampers, coils, etc.) requiring access in order to install access doors and panels in the
ceiling.
5. Furnish and set sleeves for passage of pipes, ducts and conduits through structural
masonry and concrete walls and floors and elsewhere as will be required for the
proper protection of each pipe and duct passing through building surfaces.
6. Properly provide firestopping around all pipes, conduits, ducts, sleeves, etc. which pass
through rated walls, partitions and floors.
7. Provide detailed information on openings and holes required in precast members.
Cast holes of all diameters. Field-cut holes will not be allowed.
8. Provide required supports and hangers for ductwork, piping and equipment, designed
so as not to exceed allowable loadings of structures.
9. Examine and compare the contract drawings and specifications with the drawings and
specifications of all divisions, and report any discrepancies between them to the E.R.
and obtain from him written instructions for changes necessary in the work. Install
and coordinate the work in cooperation with other related divisions. Before
installation, make proper provisions to avoid interferences.
10. Wherever the work is of sufficient complexity, prepare additional detail drawings to
scale similar to that of the design drawings, prepared on tracing medium. With these
layouts, coordinate the work. Such detailed work to be clearly identified on the
drawings as to the area to which it applies. Submit these drawings to the E.R. for
review. At completion, include a set of such drawings with each set of as-built
drawings.
11. Before commencing work, examine adjoining work on which this work is in any way
dependent for perfect workmanship and report conditions which preventperformance of first class work. Become thoroughly familiar with actual existing
conditions to which connections must be made or which must be changed or altered.
12. Adjust location of pipes, ducts, panels, equipment, etc., to accommodate the work to
prevent interferences, both anticipated and encountered. Determine the exact route
and location of each pipe and duct prior to fabrication.
Page 12 of 42
a. Right-of-Way: Lines which pitch have the right-of-way over those which do
not pitch. For example: condensate, and plumbing drains normally have rightof-way. Lines whose elevations cannot be changed have right-of-way over
lines whose elevations can be changed.
b. Make offsets, transitions and changes in direction in pipes and ducts as
required to maintain proper head room and pitch on sloping lines. Furnish
and install air vents, drains, etc., as required to effect these offsets, transitions
and changes in direction.
13. Install work to permit removal (without damage to other parts) of coils, heat
exchanger plates and tube bundles, fan shafts and wheels, filters, belt guards, sheaves
and drives, and other parts requiring periodic replacement or maintenance. Arrange
pipes, ducts, and equipment to permit access to valves, cocks, starters, motors, and
control components, and to clear the openings of swinging doors and access panels.
14. Changes in the cross-sectional dimensions of the ductwork are permissible when
required to meet job conditions. Maintain at least the same equivalent cross-sectional
duct area in accordance with the latest edition of the SMACNA and ASHRAE Guide.
Secure the approval of the E.R. prior to fabrication of ductwork requiring such changes.
15. Provide access panels in equipment, ducts, etc., as required for inspection and
maintenance of internal equipment, dampers, plenums, etc.
16. In cases of doubt as to the Work intended, or in the event of need for explanation
thereof, request supplementary instructions from the E.R.
1.13
Cutting and Patching
1. Lay out the work in advance and fully coordinate. Where cutting, channeling, chasing
or drilling of floors, walls, partitions, ceilings or other surfaces is necessary for the
proper installation, support or anchorage of ductwork, piping or other equipment, do
the work carefully so as not to damage adjacent work. Repair any damage to the
building, piping, equipment or defaced finish plaster, woodwork, metalwork, etc. using
skilled mechanics at no additional cost to the Employer.
2. Do no cutting, channeling, chasing or drilling of unfinished masonry, tile, etc., unless
permission from the E.R. is first obtained. If permission is granted, perform this work
in a manner approved by the E.R.
3. Where ductwork, piping or equipment are mounted on a painted finished surface, or a
surface to be painted, paint to match the surface. Cold galvanize bare metal whenever
support channels are cut.
4. Slots, chases, openings and recesses through floors, walls, ceilings, and roofs will be
provided by the various division with their respective materials. The division requiring
them to properly locate such openings and be responsible for any cutting and patching
caused by the neglect to do so.
1.14
Responsibility for Evaluation
1. The E.R. makes no representations, regarding the character or extent of the subsoils,
water levels, existing structural, mechanical and electrical installations, above or below
ground, or other subsurface conditions which may be encountered during the work.
The Contractor must make his own evaluation of existing conditions which may affect
methods or cost of performing the work, based on his own examination of the facility
or other information. Failure to examine the drawings or other information does not
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relieve the Contractor of his responsibility for satisfactory accomplishment of the
work.
1.15
Fire Access to Fire Apparatus
1. Do not interfere with access to hydrants and fire alarm boxes. In no case allow material
or equipment to be within 6 meters of a hydrant or fire alarm box.
1.16
Equipment Pad and Anchor Bolts
1. Concrete plinths for various pieces of equipment will be furnished by the Contractor
under another Division. This shall include floor mounted equipment, equipment
mounted on legs and pipe support stands.
2. Generally conform equipment pads to the shape of the piece of equipment it serves
with a minimum 80 mm margin around the equipment and supports. Pads will be a
minimum of 100 mm high. Use shop drawings stamped "NO EXCEPTIONS" for
dimensional guidance in sizing pads.
3. Furnish and install galvanized anchor bolts for all equipment placed on concrete
equipment pads, inertia blocks, or on concrete slabs. Provide bolts of the size and
number recommended by the manufacturer of the equipment and locate by means of
suitable templates. When equipment is placed on vibration isolators, secure the
equipment to the isolator and secure the isolator to the floor, pad, or support as
recommended by the vibration isolation manufacturer.
4. Where control panels, motor controllers, etc., are mounted on gypsum board
partitions, the mounting screws will pass through the gypsum board and be securely
attached to the partition studs. At the Contractor's option, the mounting screws may
pass through the gypsum board and be securely attached to 150 mm square
galvanized metal backplates which are attached to the gypsum board with an
approved non-flammable adhesive. Toggle bolts installed in gypsum board partitions
are not acceptable.
1.17
Delivery, Rigging and Hauling
1. Include all rigging, hauling, hoisting, shoring and placement in the building of
equipment specified herein. Be responsible for the timely delivery and introduction of
equipment to the project as required by the construction schedule for this project. If
any item of equipment is received prior to the time it is required, be responsible for its
proper storage and protection until such time as it may be required. Pay for all costs of
storage.
2. If any item of equipment is not delivered to or installed at the project site in a timely
manner as required by the project construction schedule, be solely responsible for
disassembly, re-assembly, manufacturer's supervision, shoring, general construction
modification, delays, overtime costs, etc. No additional cost or delays to be incurred
by the Employer.
1.18
Equipment and Material Protection
1.
Protect the work, equipment and materials from damage by work or workmen.
Correct all damage without additional cost to the Employer.
2. Be responsible for all work, materials and equipment until finally inspected, tested and
accepted; protect work against theft, injury or damage; and carefully store material
and equipment received on site which are not immediately installed. Close open ends
of work with temporary covers or plugs during construction to prevent entry of
Page 14 of 42
obstructing material. Cover and protect in an acceptable manner to the Employer, all
equipment and materials from damage due to weather, water, spray-on fireproofing,
construction debris, etc.
3. Provide adequate means for fully protecting finished parts of the materials and
equipment against damage from whatever cause during the progress of the work until
final acceptance. Protect materials and equipment in storage and during construction
in such a manner that no finished surfaces will be damaged or marred, and moving
parts kept clean and dry. If items are damaged, do not install, but take immediate
steps to obtain replacement or repair.
1.19
Electrical Equipment and Electrical Room Precautions
1. In general, do not install any piping systems not included as part of the electrical work,
in any switchgear, transformer, elevator equipment, telephone, or electrical
equipment room.
2. Do not install piping above switchboards, panelboards, control panels, motor control
centers, individual motor controllers, etc.
1.20
Equipment Guards
1. Provide easily removable expanded metal guards for all belts, couplings, exposed fan
inlets and outlets, and other moving parts of machinery. Provide tachometer openings
in the guards at least 50 mm in diameter, for all belt-driven or variable speed
machinery. Comply with applicable requirements for all equipment guards.
1.21
Lubrication
1. Provide means for lubricating all bearings and other machine parts. If a part requiring
lubrication is concealed or inaccessible, extend a metallic lubrication tube with suitable
fitting to an accessible location and suitably identify it.
2. After installation, properly lubricate all parts requiring lubrication and keep them
adequately lubricated with a lubricant recommended by the equipment manufacturer
until the Employer issues a Certificate of Substantial Completion for the specific
equipment item or system.
3. Provide list to E.R of lubricants that are locally available. Use of those lubricants will
not in any manner decrease guarantee and/or warranty liability to Employer.
1.22
Date of Completion and Testing of the Air Conditioning Systems
1. Comply with the project construction schedule for the date of final performance and
acceptance testing, and be sufficiently in advance of the Contract completion date to
permit the execution of the testing prior to occupancy and the close-out of the
Contract. Complete any adjustments and/or alterations which the final acceptance
tests indicate as necessary for the proper functioning of all equipment prior to the
completion date. See individual sections for extent of testing required.
2. Provide a detailed schedule of completion indicating when each system is to be
completed and outlining when tests will be performed. Submit completion schedule
to the E.R. and Employer for review within four (4) months after the notice to proceed
by the E.R. has been given. Update this schedule periodically as the project
progresses.
Page 15 of 42
1.23
Operating Instructions
1. Provide the services of a factory trained specialists to supervise the operation of all
equipment specified herein and to instruct the Employer’s operators for a thirty (30)
day operating instruction period. The operating instruction period is defined as
straight time working hours and not including nights, weekends or travel time to and
from the project. See individual sections for additional instructions by manufacturer's
trained specialists. Coordinate with "Commissioning Manual".
1.24
Operating and Maintenance Books
1. Provide operating instructions and maintenance data books for all equipment and
materials furnished under this Division.
2. Submit five (5) final copies of operating and maintenance data books for review at
least ten (10) weeks before final review of the project. Assemble all data in a
completely indexed volume or volumes in three-ring binders and identify the size,
model, and features indicated for each item. Print the project name and logo on the
outside of the binders.
3. Deliver four (4) initial copies of the operation and maintenance data books to the E.R.
six (6) months after notice to proceed has been given. Include in the initial copies all
the information in Paragraph 1.24.5 below, except Item 1.24.5.d.
4. Maintenance instruction manuals to include complete oiling, cleaning, and servicing
data compiled in clearly and easily understandable form. Show all model numbers of
each piece of equipment, complete lists of replacement parts, motor ratings, and
actual loads.
5. Include the following information where applicable:
a. Identifying name and mark number.
b. Locations (where several similar items are used, provide a list).
c. Complete nameplate data.
d. Certified Record Drawings and "Final Reviewed" Shop Drawings.
e. Parts list.
f.
Performance curves and data.
g. Wiring diagrams.
h. Lubrication charts.
i.
Manufacturer’s recommended operating and maintenance instructions with
all non-applicable information deleted.
j.
List of spare parts recommended for normal service requirements.
k. Assembly and disassembly instructions with exploded view Drawings where
available.
l.
1.25
Trouble shooting diagnostic instructions where applicable.
Record Drawings
1. Maintain on a daily basis at the project site a complete black and white set of "As-Built
Drawings", reflecting an accurate dimensional record of all deviations between work
shown on Drawings and that actually installed.
Page 16 of 42
2. Record dimensions clearly and accurately to delineate the work as installed; suitably
identify locations of all equipment by at least two dimensions to permanent structures.
In addition, mark the Record Drawings to show the precise location of concealed work
and equipment, including concealed or embedded piping and valves and all changes
and deviations in the mechanical work from that shown on the Contract Documents.
This requirement is not construed as authorization for the Contractor to make changes
in the layout or work without written definite instructions from the E.R.
3. Upon completion of the installation, obtain from the E.R. a complete set of mylar
transparencies on heavy gauge film with firm names removed. Enter thereon, in a
neat and accurate manner, a complete record of all revisions of the original drawings,
as actually installed. Bear the cost for transparencies and for making required
changes. Submit three (3) sets of black and white prints of these revised
transparencies to the E.R. for review of completeness. After review by the E.R., make
necessary changes to transparencies and then deliver them to the E.R. for transmittal
to the Employer. E.R. will not review these drawings for accuracy nor will the E.R. bear
any responsibility for accuracy or completeness.
4. Mark all As-Built Drawings on the front lower right hand corner with a permanent ink
or rubber stamp impression that states the following:
"AS-BUILT DRAWINGS" (10 mm high letters)
“To be used for recording Field Deviations and
Dimensional Data Only". (5 mm high letters)
As built drawings will be prepared on "AutoCad". Version to be determined by E.R.
5. The Record Drawings will also consist of a set of prints of the final "Signed Off"
Contractor's "Coordination Drawings".
1.26
Certification
1. Any certifications required by the Specifications, in addition to those required for shop
drawings, product data, equipment and other items, are to be so certified by the
Employer, a Partner, or a Corporate Officer of the firm required to provide the
Certification, or by another person duly authorized to sign binding agreements for and
in behalf of the Employer, Partner or Corporation.
2. All tests as required by this division of the specification that reference an agency such
as ASME shall be properly certified. Each and every piece of equipment, piping system,
etc. tested shall have a certificate from the factory stating test conditions, date of test,
inspector, equipment identification, and test requirements.
1.27
Final Review
1. At a time designated by the E.R., the entire system will be reviewed for compliance
with the Contract Drawings and Specifications. Be available at all times during this
review.
2. Demonstrate to the E.R. prior to the Final Review that all systems and all equipment
have been properly balanced and adjusted and are in compliance with the
requirements of the Contract Documents. After these demonstration tests are
satisfactorily completed, but prior to the Final Review field visit, the Contractor will
submit to the E.R. a written certification that attests to the Contract Document
compliance for this Project prior to the E.R.'s Final Review field visit.
3. Operate the entire system properly with all systems balanced and all controls adjusted.
Page 17 of 42
4. Certificates and Documents required herein to be in order and presented to the E.R. at
least eight (8) weeks prior to the Final Review.
5. After the review, any changes or corrections noted as necessary for the work to
comply with these specifications and the Drawings to be accomplished without delay
in order to secure final acceptance of the work.
1.28
Early Occupancy
1. Be responsible for completing those systems which are necessary to allow partial
occupancy of the buildings even if systems in the unoccupied areas are incomplete.
2. Verify requirements for temporary occupancy with the local Building Department.
1.29
Relevant Regulations and Standards
1. The whole of the works covered by this Specification shall be carried out in accordance
with the latest Uniform Building Code. Works performed shall be to the approval of
the relevant local Authorities.
2. Comply with all statutory obligations and regulations of any Local Authority, Public
Service or Statutory Undertaking relating to the execution of the Works as well as with
requirements of the Uniform Building Code and all other applicable codes.
3. Where codes or standards are listed herein, the applicable portions apply. The
published version current at the time the Tenderer receives the tender documents will
apply.
4. Plans, specifications, codes and standards are all minimum requirements. Where
requirements differ, apply the more stringent.
5. Should any change in plans or specifications be required to comply with governing
regulations, the Tenderer to notify the E.R. at the time of submitting his tender.
6. All items of plate and equipment, including gauges and all drawings and schedules shall
be in system international (SI) units. The specific approval of the E.R. shall be obtained
before any equipment dimensioned or calibrated in imperial units is incorporated in
works.
2.0
Products
2.1
AIR-CONDITIONING UNITS
1. The Contractor shall design, supply, packing for transport, delivery to site, unloading,
installation, connecting, final testing and putting into commission, handing-over in
approved working order and maintenance air-cooled split cooling units as required.
The units shall have the capacities not less than that given in the Schedule of
Equipment and Works when supplied with condenser air at an entering temperature of
35°C and condensing temperature of 46°C.
2. Each split package air-conditioner shall be complete with outdoor condensing unit,
indoor fan coil units, all interconnecting pipework and drains, all necessary electrical
wiring and all necessary controls such as remote and wired controller, central
controller per system per floor, for the proper and efficient operation of the complete
system.
A.
Submittals
1. Shop Drawings
Page 18 of 42
a.
Submit dimensioned drawings with operating weights, piping connections,
wiring diagrams, and control interface diagrams.
b.
Submit wiring diagrams for all controls, including panel layout and remote
devices.
2. Product Data: Manufacturer’s latest listed data for materials, equipment and installation.
3. Test Reports
B.
a.
Certified sound power levels.
b.
Certification of all factory tests as required herein.
c.
Statement of compliance with all required authorities.
d.
Submit sound power levels and rating data for all units.
Quality Assurance
1. Each unit, including factory-installed options, performance tested and rated in
compliance with ARI 210 and ARI 360, Commercial and Industrial Unitary Air
Conditioning Equipment.
1. Air-cooled Split Type Fan coil Units
1.
Manufacturers: Subject to compliance with requirements, provide products by one of the
manufacturers specified.
a. Mitsubishi
b. Daikin
c. Or approved equivalent.
2.
Indoor Fan Coil Unit Description: Factory-assembled and tested, in configurations as
scheduled, consisting of unit casing, fans, filters, coils and controls.
a. Refrigerant: R-410A.
b. Thermostat/Controller: Infrared Remote.
3.
Evaporator: Direct-expansion copper tube/aluminum fin evaporator coil with fan,
configured in integral cabinet complete with electronic controls. Provide mounting
plate/hardware, integral polypropylene air filter and piping/wiring connections
(refrigerant, condensate drain and electrical). Provide Units in following configurations
and as shown on drawings:
a.
b.
c.
d.
e.
Page 19 of 42
W.all Surface-mounted.
Ceiling Surface-mounted.
Concealed Low-Profile Ducted – Horizontal.
Concealed High-Static-Pressure Ducted – Horizontal.
Ceiling Recessed-cassette.
4.
The Fan Coil Unit shall have 3-speeds of operation, a timer control and a temperature
setting control. The external housing of each unit shall be constructed from galvanised
or zinc coated steel, bonderized and painted with corrosion resistant enamel, or
otherwise finished to approval. The housing shall include sufficient inspection panels to
provide easy access to all components or maintenance purpose and shall be drained in
approved manner.
5.
The portion of each housing around and after the cooling coil shall be thermally
insulated with approved insulation. No condensation shall be allowed to form inside and
outside the housing.
6.
Each housing shall incorporate all necessary openings and/or grilles for supply, return
and fresh air. Coil shall be adequately sized to pass the required air volume at a face
velocity not exceeding 2.5 meter per second (500 ft. per minute). The arrangement of
the filter shall be such that it can be easily removed and replaced.
7.
Cooling coil shall be of the direct expansion type and shall be of non-ferrous
construction. The coil shall be made from seamless copper tube fitted with either
copper or aluminium fins.
8.
Fins shall be mechanically bonded tube and shall have fin spacing of not more than 12
fins per in and not less than 8 fins per inch.
9.
Each coil shall be fitted with suction headers, liquid distributors expansions devices,
isolating valves, solenoid valve etc. as necessary for proper operation of the unit. Air
velocity across the coil surface not to exceed 2.5 meter per second (500 ft. per minute).
Each coil shall have an insulated condensate tray with drain.
2. Air-Cooled Condensing Unit
1.
Outdoor Condensing Unit Description: Factory assembled and tested, air-cooled;
consisting of casing, multiple compressors, condenser coils, condenser fans and motors
(DC), and unit controls. Provide direct-expansion air-cooled condensing unit in
polyester powder-coated galvanized steel casing, suitable for outdoor use. Provide
copper tube/aluminum fin condenser coil, both Variable-speed rotary/scroll-hermetic
compressor w/ internal overload protection, plastic-resin spiral condenser fan and
integral electronic operating controls, including refrigeration thermal expansion valve.
Include the following:
a. The enclosure shall have provision for easy access during installation and for
future maintenance. The base shall be of steel fully galvanised, with provisions
for rigging and mounting. The whole assembly shall be thoroughly reinforced
at all points of stress.
b. The air discharge from the condensing section shall be either horizontal or
vertical. The fan outlet shall be protected by means of zinc plated, iridite or
suitable anti-corrosion coated fan guard.
c. Condenser coil shall be similar to the cooling coil, and shall be designed for
outdoor operation.
d. The fan shall be drip proof, grease lubricated ball bearing type. The motors
shall be protected from the weather. Fan motor shall incorporate internal
overload protection and shall be interlocked with the compressor.
e. The refrigerant compressor for each unit shall be of the hermetically sealed
type, multi-cylinder machines, shall be mounted on springs or rubber
mountings and shall be free from excessive noise and vibration. Any adequate
lubrication system suitable for each compressor shall be incorporate and all
necessary ancillaries such as mufflers, oil separator, dryers, etc. shall be
provided. A shield to muffle operating noise shall be provided.
f.
Cranked case heater shall be provided to compressor (for 3 phase)
g. The storage tank or receiver shall be sized to accommodate an average
system refrigerant charge in the receiver and condenser coil. The receiver
shall be constructed of heavy gauge steel tubing conforming to relevant ASME
code.
h. Pressure gauge connection points shall be provided in suitable location in the
high and low pressure lines of the refrigerant circuit for testing purposes.
i.
The units shall be fitted with all necessary controls and safety devices for
automatic operation.
j.
High and low pressure safety control shall be incorporate in the refrigerant
circuit.
k. Thermal overload protection shall be provided for each motor on each phase.
Page 20 of 42
2.2
2.
The cooling operation of the unit shall be controlled by a thermostat with its bulb located
in the return air stream unless otherwise indicated on the drawing. The thermostat shall
have a temperature range of approximately 12.8 °C (55°F) to 32.2°C (90°F) and
adjustable set joint.
3.
Refrigerant pipe shall be carried out in seamless copper tube of appropriate grade for
the operation pressure conforming to A.S.T.M. specification B 88-33. Insulation shall be
in accordance to the sub-heading insulation in this Specification.
REFRIGERANT PIPING
1.
This section details the requirements in respect of materials and workmanship in general
for the installation of pipework, fittings and accessories for the pipework system required
for this project.
2.
The installation of the pipework system shall comply with the relevant Standard
specification, Local Authority Regulations and By-Laws. All installations shall be tested
and approved by the relevant Local Authority where necessary.
3.
All necessary fees, for approval of the installation shall be paid by this sub-Contractor.
4.
All pipework shall be supplied, installed, connected up and tested in the positions
generally as shown on the accompanying drawings. The exact location of the pipe runs
shall be ascertained by this sub-contractor on site to suit the prevailing conditions. The
work shall be executed in an approved manner avoiding as far as possible any
interference with the work of other trades.
5.
All pipework shall be installed following the latest technique and practice. Allowance
shall be made for thermal expansion of the pipework as shown on the drawings where
required.
6.
All pipes shall c/w mill certificate from factory of manufacture.
1. Standard Commercial Products
1.
Provide materials and equipment which are standard products of a manufacturer
regularly engaged in the manufacturing of such products, that are of a similar material,
design and workmanship and that have been in satisfactory commercial or industrial
use for 2 years prior to bid opening.
2.
The 2 year use shall include applications of equipment and materials under similar
circumstances and of similar size. The 2 years’ experience shall be satisfactorily
completed by a product which has been sold or is offered for sale on the commercial
market through advertisements, manufacturer's catalogs, or brochures. Products having
less than a 2 year field service record will be acceptable if a certified record of
satisfactory field operation, for not less than 6000 hours exclusive of the manufacturer's
factory tests, can be shown.
3.
Products shall be supported by a service organization. System components shall be
environmentally suitable for the indicated locations.
4.
Exposed equipment moving parts, parts that produce high operating temperature, parts
which may be electrically energized, and parts that may be a hazard to operating
personnel shall be insulated, fully enclosed, guarded, or fitted with other types of safety
devices. Install safety devices so that proper operation of equipment is not impaired.
Welding and cutting safety requirements shall be in accordance with AWS Z49.1.
2. Electrical Works
1.
Page 21 of 42
Electrical equipment wiring and field wiring shall be in accordance with manufacturer's
instructions. Manual or automatic control and protective or signal devices required for
the operation specified and any control wiring required for controls and devices
specified, but not shown, shall be provided.
3. Refrigerant Piping System
1.
Refrigerant piping, valves, fittings, and accessories shall be in accordance with
ANSI/ASHRAE 15 & 34 and ASME B31.5, except as specified herein. Refrigerant
piping, valves, fittings, and accessories shall be compatible with the fluids used and
capable of withstanding the pressures and temperatures of the service. Refrigerant
piping, valves, and accessories used for refrigerant service shall be cleaned,
dehydrated, and sealed (capped or plugged) prior to shipment from the manufacturer's
plant.
4. Pipe, Fittings and End Connections (Joints)
1.
Copper Tubing
a. Copper tubing shall conform to ASTM B 280 annealed or hard drawn as required.
Copper tubing shall be soft annealed where bending is required and hard drawn
where no bending is required. Soft annealed copper tubing shall not be used in
sizes larger than 35 mm (1-3/8 inches). Joints shall be brazed except that joints on
lines 22 mm (7/8 inch) and smaller may be flared. Cast copper alloy fittings for
flared copper tube shall conform to ASME B16.26 and ASTM B 62. Wrought
copper and bronze solder-joint pressure fittings shall conform to ASME B16.22 and
ASTM B 75M ASTM B 75. Joints and fittings for brazed joint shall be wroughtcopper or forged-brass sweat fittings. Cast sweat-type joints and fittings shall not
be allowed for brazed joints. Brass or bronze adapters for brazed tubing may be
used for connecting tubing to flanges and to threaded ends of valves and
equipment.
2.
Solder
a. Solder shall conform to ASTM B 32, grade Sb5, tin-antimony alloy for service
pressures up to 1034 kPa (150 psig). Solder flux shall be liquid or paste form, noncorrosive and conform to ASTM B 813.
3.
Brazing Filler Metal
a. Filler metal shall conform to AWS A5.8/A5.8M, Type BAg-5 with AWS Type 3 flux,
except Type BCuP-5 or BCuP-6 may be used for brazing copper-to-copper joints.
5. Valves
Valves shall be designed, manufactured, and tested specifically for refrigerant service.
Valve bodies shall be of brass, bronze, steel, or ductile iron construction. Valves 25 mm
(1 inch) and smaller shall have brazed or socket welded connections. Valves larger than
25 mm (1 inch) shall have [tongue-and-groove flanged] [butt welded] end connections.
Threaded end connections shall not be used, except in pilot pressure or gauge lines
where maintenance disassembly is required and welded flanges cannot be used.
Internal parts shall be removable for inspection or replacement without applying heat or
breaking pipe connections. Valve stems exposed to the atmosphere shall be stainless
steel or corrosion resistant metal plated carbon steel. Direction of flow shall be legibly
and permanently indicated on the valve body. Control valve inlets shall be fitted with
integral or adapted strainer or filter where recommended or required by the
manufacturer. Purge, charge and receiver valves shall be of manufacturer's standard
configuration.
1. Refrigerant Stop Valves
a. Valve shall be the globe or full-port ball type with a back-seating stem especially
packed for refrigerant service. Valve packing shall be replaceable under line
pressure. Valve shall be provided with a wrench operator and a seal cap. Valve
shall be the straight or angle pattern design as indicated.
2. Check Valves
Page 22 of 42
a. Valve shall be the swing or lift type as required to provide positive shutoff at the
differential pressure indicated. Valve shall be provided with resilient seat.
3. Liquid Solenoid Valves
a. Valves shall comply with ANSI/ARI 760 and be suitable for continuous duty with
applied voltages 15 percent under and 5 percent over nominal rated voltage at
maximum and minimum encountered pressure and temperature service conditions.
Valves shall be direct-acting or pilot-operating type, packless, except that packed
stem, seal capped, manual lifting provisions shall be furnished. Solenoid coils shall
be moisture-proof, UL approved, totally encapsulated or encapsulated and metal
jacketed as required.
b. Valves shall have safe working pressure of 2760 kPa (400 psi) and a maximum
operating pressure differential of at least 1375 kPa (200 psi) at 85 percent rated
voltage suitable for the refrigerant used.
c.
Valves shall have an operating pressure differential suitable for the refrigerant
used.
4. Expansion Valves
a. Valve shall conform to ANSI/ARI 750 and ASHRAE 17. Valve shall be the
diaphragm and spring-loaded type with internal or external equalizers, and bulb
and capillary tubing.
b. Valve shall be provided with an external superheat adjustment along with a seal
cap. Internal equalizers may be utilized where flowing refrigerant pressure drop
between outlet of the valve and inlet to the evaporator coil is negligible and
pressure drop across the evaporator is less than the pressure difference
corresponding to 1 degree C of saturated suction temperature at evaporator
conditions. Bulb charge shall be determined by the manufacturer for the application
and such that liquid will remain in the bulb at all operating conditions. Gas limited
liquid charged valves and other valve devices for limiting evaporator pressure shall
not be used without a distributor or discharge tube or effective means to prevent
loss of control when bulb becomes warmer than valve body.
c.
Pilot-operated valves shall have a characterized plug to provide required
modulating control. A de-energized solenoid valve may be used in the pilot line to
close the main valve in lieu of a solenoid valve in the main liquid line. An isolatable
pressure gauge shall be provided in the pilot line, at the main valve. Automatic
pressure reducing or constant pressure regulating expansion valves may be used
only where indicted or for constant evaporator loads.
5. Safety Relief Valves
a. Valve shall be the two-way type, unless indicated otherwise.
b. Valve shall bear the ASME code symbol.
c.
Valve capacity shall be certified by the National Board of Boiler and Pressure
Vessel Inspectors.
d. Valve shall be of an automatically reseating design after activation.
6. Evaporator Pressure Regulators, Direct-Acting
a. Valve shall include a diaphragm/spring assembly, external pressure adjustment
with seal cap, and pressure gauge port. Valve shall maintain a constant inlet
pressure by balancing inlet pressure on diaphragm against an adjustable spring
load. Pressure drop at system design load shall not exceed the pressure difference
corresponding to a 1 degree C change in saturated refrigerant temperature at
evaporator operating suction temperature. Spring shall be selected for indicated
maximum allowable suction pressure range.
7. Refrigerant Access Valves
Page 23 of 42
a. Refrigerant access valves and hose connections shall be in accordance with ARI
720.
6. Piping Accessories
1.
Filter Driers
a. Driers shall conform to ARI 711/ARI 710. Sizes 15 mm (5/8 inch) and larger shall
be the full flow, replaceable core type. Sizes 13 mm (1/2 inch) and smaller shall be
the sealed type. Cores shall be of suitable desiccant that will not plug, cake, dust,
channel, or break down, and shall remove water, acid, and foreign material from
the refrigerant.
b. Filter driers shall be constructed so that none of the desiccant will pass into the
refrigerant lines. Minimum bursting pressure shall be 10.3 MPa (1,500 psi).
2.
Sight Glass and Liquid Level Indicator
a. Assembly and Components
Assembly shall be pressure- and temperature-rated and constructed of materials
suitable for the service. Glass shall be borosilicate type. Ferrous components
subject to condensation shall be electro-galvanized.
b. Gauge Glass
Gauge glass shall include top and bottom isolation valves fitted with automatic
checks, and packing followers; red-line or green-line gauge glass; elastomer or
polymer packing to suit the service; and gauge glass guard.
c.
Bull's-Eye and Inline Sight Glass Reflex Lens
Bull's-eye and inline sight glass reflex lens shall be provided for dead-end liquid
service. For pipe line mounting, two plain lenses in one body suitable for
backlighted viewing shall be provided.
d. Moisture Indicator
Indicator shall be a self-reversible action, moisture reactive, color changing media.
Indicator shall be furnished with full-color-printing tag containing color, moisture
and temperature criteria. Unless otherwise indicated, the moisture indicator shall
be an integral part of each corresponding sight glass.
e. Vibration Dampeners
Dampeners shall be of the all-metallic bellows and woven-wire type.
f.
Flexible Pipe Connectors
Connector shall be a composite of interior corrugated phosphor bronze or Type
300 Series stainless steel, as required for fluid service, with exterior reinforcement
of bronze, stainless steel or monel wire braid. Assembly shall be constructed with a
safety factor of not less than 4 at 150 degrees C (300 degrees F). Unless
otherwise indicated, the length of a flexible connector shall be as recommended by
the manufacturer for the service intended.
g. Strainers
Strainers used in refrigerant service shall have brass or cast iron body, Y-or anglepattern, cleanable, not less than 60-mesh non-corroding screen of an area to
provide net free area not less than ten times the pipe diameter with pressure rating
compatible with the refrigerant service. Screens shall be stainless steel or monel
and reinforced spring-loaded where necessary for bypass-proof construction.
h. Pressure and Vacuum Gauges
Gauges shall conform to ASME B40.100 and shall be provided with throttling type
needle valve or a pulsation dampener and shut-off valve. Gauge shall be a
Page 24 of 42
minimum of 85 mm (3-1/2 inches) in diameter with a range from 0 kPa to
approximately 1.5 times the maximum system working pressure. Each gauge
range shall be selected so that at normal operating pressure, the needle is within
the middle-third of the range.
i.
Temperature Gauges
Temperature gauges shall be the industrial duty type and be provided for the
required temperature range. Gauges shall have Celsius scale in 1 degree
Fahrenheit scale in 2 degrees graduations scale (black numbers) on a white face.
The pointer shall be adjustable. Rigid stem type temperature gauges shall be
provided in thermal wells located within 1.5 m (5 feet) of the finished floor.
Universal adjustable angle type or remote element type temperature gauges shall
be provided in thermal wells located 1.5 to 2.1 m (5 to 7 feet) above the finished
floor. Remote element type temperature gauges shall be provided in thermal wells
located 2.1 m 7 feet above the finished floor.
j.
Stem Cased-Glass
Stem cased-glass case shall be polished stainless steel or cast aluminum, 229 mm
(9 inches) long, with clear acrylic lens, and non-mercury filled glass tube with
indicating-fluid column.
k.
Bimetallic Dial
Bimetallic dial type case shall be not less than 89 mm (3-1/2 inches), stainless
steel, and shall be hermetically sealed with clear acrylic lens. Bimetallic element
shall be silicone dampened and unit fitted with external calibrator adjustment.
Accuracy shall be one percent of dial range.
l.
Liquid-, Solid-, and Vapor-Filled Dial
Liquid-, solid-, and vapor-filled dial type cases shall be not less than 89 mm (3-1/2
inches), stainless steel or cast aluminum with clear acrylic lens. Fill shall be
nonmercury, suitable for encountered cross-ambients, and connecting capillary
tubing shall be double-braided bronze.
m. Thermal Well
Thermal well shall be identical size, 13 or 19 mm (1/2 or 3/4 inch) NPT connection,
brass or stainless steel. Where test wells are indicated, provide captive plug-fitted
type 13 mm (1/2 inch) NPT connection suitable for use with either engraved stem
or standard separable socket thermometer or thermostat. Mercury shall not be
used in thermometers. Extended neck thermal wells shall be of sufficient length to
clear insulation thickness by 25 mm (1 inch.)
n. Pipe Hangers, Inserts, and Supports
Pipe hangers, inserts, guides, and supports shall conform to local and International
Standards
o. Escutcheons
Escutcheons shall be chromium-plated iron or chromium-plated brass, either one
piece or split pattern, held in place by internal spring tension or set screws.
7. Fabrication
1.
Factory Coating
Unless otherwise specified, equipment and component items, when fabricated from
ferrous metal, shall be factory finished with the manufacturer's standard finish,
except that items located outside of buildings shall have weather resistant finishes
that will withstand 125 hours exposure to the salt spray test specified in ASTM B
117 using a 5 percent sodium chloride solution. Immediately after completion of the
test, the specimen shall show no signs of blistering, wrinkling, cracking, or loss of
Page 25 of 42
adhesion and no sign of rust creepage beyond 3 mm (1/8 inch) on either side of
the scratch mark. Cut edges of galvanized surfaces where hot-dip galvanized
sheet steel is used shall be coated with a zinc-rich coating conforming to ASTM D
520, Type I.
2.
Factory Applied Insulation
Refrigerant suction lines between the cooler and each compressor shall be
insulated with not less than 19 mm 3/4 inch thick unicellular plastic foam. Factory
insulated items installed outdoors are not required to be fire-rated. As a minimum,
factory insulated items installed indoors shall have a flame spread index no higher
than 75 and a smoke developed index no higher than 150. Factory insulated items
(no jacket) installed indoors and which are located in air plenums, in ceiling spaces,
and in attic spaces shall have a flame spread index no higher than 25 and a smoke
developed index no higher than 50. Flame spread and smoke developed indexes
shall be determined by ASTM E 84. Insulation shall be tested in the same density
and installed thickness as the material to be used in the actual construction.
Material supplied by a manufacturer with a jacket shall be tested as a composite
material. Jackets, facings, and adhesives shall have a flame spread index no
higher than 25 and a smoke developed index no higher than 50 when tested in
accordance with ASTM E 84.
2.3
FANS
1. Fans shall be capable of giving the specified capacity performance when tested in
accordance with AMCA 210-85 standard, ANSI/ASHRAE Standard 51-1985 “Laboratory
Methods Of *Testing Fans For Rating” capacity and sound performance shall conform
to AMCA Standard 300-85, “Reverberant Room Method for Sound Testing Of Fans”.
Although estimated values of the resistance to air-flow of items of equipment may be
indicated this does not relieve the Contractor of the responsibility for providing fans
capable of delivering the required air volume through the system.
2. Each fan shall be capable of continuous operation, having the capacity as indicated in
the Schedule of Equipment & Works and/or in the drawings when running at the
specified speed against the friction in the system as installed.
3. For centrifugal fan and axial fan, the whole fan, shaft and motor assembly shall be
statically and dynamically balanced to ISO1940.1973 quality grade G6.3 and complete
with matching housing. Bearings shall be heavy duty self-aligning ball type amply sized
for the loads with factory-sealed lubrication and with provisions for relubrication
externally thru grease nipples. The ball bearing shall be designed for a life not less
than 50,000 (L 10) hours. Contractor shall submit bearing calculation details.
4. Kitchen exhaust fan shall be bifurcated axial or SISW backward curved centrifugal with
belt driven type. Fans for kitchen exhaust shall have anti-sparking impeller such as
Glass-reinforced Polyamide (PAG). DIDW centrifugal and direct drive assemblies
exposed to air stream is not acceptable.
5. Fans for smoke spill
6. Certification fans efficiency requirement
1. Centrifugal Fans
1. Scroll Type
a. Provide airfoil (AF) fan wheels, and single width single inlet (SWSI), or double
width double inlet (DWDI), as indicated on the Schedule, enclosed in a scroll
shaped fan housing.
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b. All blades shall be backwardly inclined from the direction of rotation for nonoverloading power characteristics unless otherwise indicated in the schedule.
Blades shall be continuously welded to hub plat and inlet rim.
c. Shafts shall be of SAE 1040 hot rolled stainless steel, accurately turned,
ground and polished. Shaft shall be sized so that the maximum speed is no
more than 80% of the first speed.
d. Fan housing shall be air-tight construction, with the side sheets fastened to
the scroll sheets either by a lock seam or by continuous welding. Bolts,
screws or rivets will not be acceptable. Fan outlet shall have a rolled, sloping
type cut-off to minimise air pulsation at the discharge velocity. On double
width fans, a double sloping `Vee-type’ cut-off shall be provided. Fan outlet
cone shall be one piece construction, spun and contoured to smoothly match
the inlet rim of the fan wheel inlet, and discharge duct collars shall be drilled
or punched at regular intervals to facilitate connection of duct work.
e. Access doors are required in all fans over 910mm (36”) wheel diameter.
Doors shall be of the quick opening type, secured to the frame by hand grip
bolts and provided with lift handles. Raised type access doors shall be
provided on all insulated fans (inner surface to be flushed with the scroll).
2. Tubular Type
a. Centrifugal in line fan shall be designed as a fully ducted fan with cylindrical
housing.
b. Housing shall be of galvanised steel material or its equivalent and
aerodynamically designed to guide the air efficiently into the eye of impeller
where the inherent features of the backward curve blade provides the
pressure development allows the housing to direct the air flow back into the
line. The fan housing shall have a bracket support which can be bolted to the
overhead structural frame.
c. It shall comprise of an external rotor motor directly coupled to a factory
matched high efficiency, backward curved centrifugal impeller and balanced
to quality class reference G63-VD 12060 to give quiet, virtually vibration free
running. The motor enclosure is to minimum IP 54 according to DIN 40050
with electrical design corresponding to VDE 0530 or equal Class `F’ insulation
as standard being suitable for ambient air temperature up to 50 deg. C. (122
deg. F).
d. Fitted with sealed for lift ball bearings packed with a specially developed
lubricant.
e. Specially wound for 220V/60 Hz/1 Ph AC supply. All motors are fitted with a
motor protection by means of a thermal contact switch incorporated in the
motor windings to prevent motor damaged by overloading.
3. Cabinet Centrifugal Fan
a. Box housing centrifugal in-line fan shall be the same as the cylindrical housing
centrifugal in-line fan, except for the following:
1. The casing shall be of rectangular box type, constructed of galvanised
steel sheet of 1.2m thick with flange connection.
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b. Integrated fan impeller and motor, mounted on a separate plate shall be
designed for withdrawal from the unit whilst leaving the unit connected to
the ductwork.
4.
Ceiling (Cassette) Type Fans
a. Each fan shall consist of centrifugal fan, discharge gravity damper, tightly
sealed motor with automatic oil circulation system, and baked on enamel
casing.
b. The fan shall be specifically designed for mounting at ceiling only and shall be
easily taken-off for maintenance without dismantling all the connected
exhaust duct.
2. Axial Flow Propeller Fans
1. The Contractor shall supply and install propeller fans capable of delivering the required
air volumes as shown in the drawings and given in the schedule of Equipment &
Works.
2. Fans shall be designed for maximum reliability and performance with minimum power
consumption and noise level.
3. Fans shall be capable of providing volume regulation and speed control down to 10% of
the full speed. Motors shall be totally enclosed squirrel cage induction type with lifelubricated bearings.
4. The basic fan shall be tested in accordance with AMCA and shall comprise motor,
impeller, mounting arms which incorporate neoprene anti-vibration mounts at the arm
extremities. The fans shall be completed with wire guides; external grilles, fan
chambers and VCD shall be provided if deem necessary or/and where indicated in the
drawings.
5. The propeller fan shall be directly driven by a motor. The motor can either be a singlephase capacitor start-run or a three-phase induction motor. The motor shall have
built-in inherent protection against overloading. Motor with shaded pole or
centrifugal switch type is not acceptable.
3.
Axial Flow Aerofoil Fans
1. Fans shall have aerofoil impellers made of die-cast aluminium alloy driven by squirrelcage induction motors and housed in hot dipped galvanised casings to give reliable
performance. Standard motors shall have Class ‘F’ insulation and suitable for
operation in ambient temperatures of -40°F to 104°F in a relative humidities up to
95%. Suitable starters subjects to approval of electrical engineer shall be used.
2. Fans wherever used for purpose of pressurisation and smoke spill purposes shall start
upon activation of any fire detection, alarm or extinguishing device. The Contractor
shall supply and install all necessary relays and contactors (manual/automatic) for the
purpose of connection of control wiring to the master alarm control panel.
3. All hubs shall be cast aluminium alloy.
4. Running clearance between blade tips and casing shall not exceed 1 percent of the
impeller diameter, and 2 percent for smoke spill high temperature fan where
mechanical expansion coefficients is different from normal ambient temperature. Fan
manufacturer shall provide the fan assembly similar to the tested prototype where
performance rating is published especially on clearance between blade tips and casing
where fan air performance and pressure loss are greatly affected.
Page 28 of 42
5. The impeller shall be secured to the drive shaft by a key and keyway. Axial location
shall be provided by a collar or shoulder on the drive shaft together with a retaining
washer and screw fitted into a tapped hole at the end of the shaft and locked in
position. Blades shall be secured in place to the angle setting the setscrews, locking
nuts or setting pins. Blade angle secure only by the hub and retaining tighten in
position is not acceptable.
6. The complete fans shall be “trim balance” immediately after factory assembly to
control to 4 mm/s vibration speed and below. A vibration spectrum chart of at least 6
Hz to 200 Hz shall be attached on every fan delivered. Only balancing of fan impeller
alone is not acceptable.
7. The maximum fan speed during normal operation shall be 1500 rpm (Noise control)
2.4
VIBRATION ISOLATOR
1. Restrained Spring Isolators:
a.
Minimum diameter of 0.8 of the loaded operating height and horizontal spring
stiffness 1.1 times rated vertical spring stiffness. Corrosion resistance where
exposed to corrosive/outdoor environment shall be with:
•
Springs neoprene coated.
•
Hardware cadmium plated.
•
All other metal parts hot-dip galvanized.
b. Reserve deflection, from loaded to solid height, of 50% of rated deflection with
levelling device.
c.
Minimum 6mm or 13mm thick neoprene acoustical base pad as scheduled.
d. Designed and installed so that ends of springs remain parallel.
e.
Non-resonant with equipment forcing frequencies or support structure natural
frequencies.
f.
Provide levelling devices.
g.
Restraint, provide heavy mounting frame and limit stops.
Spring hanger rod isolators shall incorporate the following additional features:
a.
Spring element seated on a steel washer with a neoprene washer.
b. Steel retainer box encasing the spring and neoprene washer.
c.
Minimum 12mm clearance between retainer box and spring hanger rod.
e.
Minimum 15 degree allowable rod misalignment from centerline axis.
Where operating weight differs from installed weight provide built-in adjustable limit
stops to prevent equipment rising when weight is removed. Stops shall not be in
contact during normal operation.
2. Neoprene Pad Isolators:
a.
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Rubber or neoprene waffle pads.
•
30 durometer.
•
Minimum 13 mm thick.
•
Maximum loading 275 kPa (40 psi).
•
Height of ribs shall not exceed 0.7 times width.
b. Configuration: Single layer 13 mm thick waffle pads bonded each side 6 mm thick
steel plate.
2.5
PIPE HANGERS, SUPPORTS AND ANCHORS
1. All piping shall be supported by means of pipe supports in accordance with the
relevant SMACNA Standard Specification.
2. All pipes supports shall be steel, adjustable for height and prime coated with rust
preventive paint and finish coated black, in the types shown in the following table.
This table does not apply for buried pipes.
Services
Pipe Size
Refrigerant Pipes All sizes
Drain
6 mm– up
Type of Support
as approved
Clamp
3. All buried pipes shall be laid in accordance with manufacturer’s recommendations
and/or local codes and ordinances.
4. Vertical risers when passing through each floor slab shall be supported to the floor by
means of clamps, collars or pipe guides attached to the pipe which in turn shall be
attached to angles. Vertical risers shall be supported at the lowest point with hanger at
elbow.
5. In instances where the pipes and clamp are of different materials, an approved type of
gasket shall be inserted between the pipe and clamp.
6. Insulated pipes shall be supported such that the insulation is not damaged due to
undue pressure on it. Care shall be taken to ensure that the vapour seal around the
supports is uninterrupted.
7. The hangers shall be fixed to the main structure by means of expanding metal plugs
and steel bolts and arranged to be loaded in shear.
8. All piping shall generally be graded to eliminate air pockets or gas locks depending on
the service.
9. The piping installation shall incorporate provisions for the venting of high points and
drawings of low points.
2.6
SOUND ATTENUATION
1. Acoustic Insulation
1. Suitable Acoustic Insulation on all vibration equipment, parts and all other necessary
connections shall be included in the tender. The acoustic treatment shall be capable of
reducing all noise transmitted from the Plantroom ductwork and etc., to noise level
not exceeding the noise criterion curves as given in the current edition of the ASHRAE
Guide and Data Book recommendation.
2. Notwithstanding the above, all supply and return ductwork of G.I. sheet metal
construction shall be internally lined with 50 mm thick duct liner especially made from
glass fibres or resin bonded fibreglass with Neoprene or similar facing having a density
of 2 lb/ft3 for a minimum distance of 6 metres from the unit. Perforated GI sheet
having minimum opening of 40 % shall be firmly fixed to the liner. The lining and its
method of fixing shall be suitable for air velocities up to 15 m/s without erosion of the
lining and to the approval of the Engineer. Ductwork acoustically treated shall have its
Page 30 of 42
external dimensions increased by 100 mm from those shown on the drawings to
maintain the required internal dimensions.
3. Unless the work is strictly adhered to the two paragraphs above, and to the
satisfaction of the Engineer, the work shall not be passed satisfactory and no
certificate of taking over shall then be issue.
2. Sound Attenuators
1. Locally factory prefabricated and be ISO9002 certified.
2. Casing to be galvanized steel: Minimum 1.20 mm and leakage proof at pressure
differential of 2000 pascals.
3. Media:
a.
Ignitability (0-20)
0
a. Spread of Flame (0-10)
0
b. Heat Evolved (0-10)
0
c. Smoke Developed (0-10)
0
d. Minimum 60Kg/cu.m density mineral fiber or rock wool packed under 5
percent compression.
e. Filler to be inert, vermin and moisture proof.
4. Internal Construction
a. Galvanized Perforated Steel Baffles: Minimum 0.50 mm.
2.7
INSULATION
1. General
1. Only skilled craftsmen related to the air-conditioning industry shall carry out all the
insulation work and special attention must be paid to the final coating of insulation
that will be on view. All plane surfaces shall be trowelled to a truly smooth surface and
all pipe insulation shall be finished using purpose made metal or hardwood formers as
necessary for a clean, smooth, unlined surface to the approval of the ER.
2. All duct and pipe insulation materials and fire-resistant double-sided aluminium foils to
be used as vapor seals for the whole installation work shall have been approved by the
ER.
2. Duct Insulation
1. The supply and return ductwork of the air-conditioning systems shall be insulated with
physically cross-linked polyolefin type insulation material as specified below.
2. The ductwork shall be externally insulated and vapour sealed with aluminium
sisalation.
3. The ductwork thermal insulation shall conform to the requirements listed below:a. The thermal conductivity of the insulation materials shall not be greater than
0.036 watt per meter degree Kelvin at a mean temperature of 20 deg.C.
b.
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The density of the insulation materials shall be 24 kg/m3 and 32 kg/m3
minimum for thickness of 25mm and 50 mm respectively.
c.
The insulation materials must be classified as non- combustible by the Fire
Authority and tested in accordance with local and International Standards.
d.
The external insulation shall be faced with fire resistance double sided
reinforced aluminium foil.
e.
The aluminium foil shall have Class I surface spread of flame and be tested in
accordance with International Standards.
f.
The vapour permeance of the aluminium foil shall not exceed 0.01 perm. The
aluminium foil shall be of 8 layer Grade Sisalation 450 or approved equivalent.
g.
The thickness of the thermal insulation shall be as shown on the drawings
and/or as follows:▪
25mm thick thermal insulation shall be used where the ductwork is
located in the return-air ceiling space between two air-conditioned
floors.
▪
50mm thick thermal insulation shall be used on ductwork in other areas
and on the area exposed to weather.
4. Insulation shall be carried out over all flexible connections and points subject to
condensation. A channel section of 1 ½ inches wide with ½ inch deep leg of 20 gauge
galvanized iron sheet shall run along the bottom of ductwork over 2 feet in width so as
to prevent sagging of insulation. The channel shall be secured to flanged connection
with self-tapping screws; the head of screws shall be covered with vapour seal
adhesive tape.
3. Piping Insulation
1. Factory Assembled Plant
a. The factory assembled plant shall be insulated as recommended by the
manufacturers and as specified earlier. This insulation may be applied at the
manufacturer’s work or on site during or after installation to the approval of
the ER.
2. Refrigerant Pipework
a. After completion of all pressure tests and charging with refrigerant, all
refrigerant suction piping and suction liquid heat exchangers shall be
insulated.
b. Insulation shall be CFC free chemically blown PVC nitrile black coloured
rubber sponge type material or physically cross-linked polyolefin type having a
thermal conductivity factor not greater than 0.30 Btu/hr/sq ft/in°F at a mean
temperature of 75°F and a thickness sufficient to prevent condensation. It
shall be supplied in tubular form, preferably without longitudinal joint. All
surfaces over which insulation is to be applied shall be dry and grease free.
Adhesive plaster shall be applied evenly on the surface. The insulation shall
then be fixed and secured by a ½ inch wide aluminum band at not more than
1 ½ feet centres. Afterwards, the whole length of insulated piping shall be
completely and neatly wrapped with an approved grey or white PVC pressure
sensitive tape. The tape shall be spirally wound around the pipe insulation
with a minimum of ¾ inch overlap of the successive tape runs. The visible
ends of pipe insulation shall be neatly coned down to the pipe of adjacent
fitting.
Page 32 of 42
c. For refrigerant pipe exposed to view and weather, an approved vapour seal
shall be used in lieu of PVC pressure sensitive tape. The insulation shall be
held securely by ½ inch wide aluminium band applied not more than 1 ½ feet
centres and vapour sealed by using the appropriate ‘Flinkote’ emulsion in two
coats. The piping with insulations shall be cladded with aluminum sheet
metal, gauge #26, stiffened on all joints. Sheet metal cladding shall be
machine bent and be free from buckles and waves. Cladding shall be painted
to match the architectural finish.
d. All joints shall be staggered and carefully sealed with vapor barrier.
e. For refrigerant pipe buried underground, the whole length of insulated piping
shall be completely and neatly wrapped with 4 inch wide water-proof tape
similar to proprietary. The tape shall be spirally wound around the pipe
insulation with a minimum of 1 inch overlap of the successive tape runs.
3. Condensate Drains
a. The insulation to be used on all condensate drain piping shall be chemically
blow PVC nitrile black-coloured rubber sponge type of material having a
thermal conductivity not greater than 0.30 Btu/Hr/Sq Ft/In/°F at a mean
temperature of 75°F.
b. It shall be supplied in tubular form, preferably without a longitudinal joint.
The insulation shall be 1 inch thick unless specified otherwise.
4. Vapour Barrier
1. After fixing the insulation, all voids in the surface shall be filled with plastic filling water
proofing compound.
2. The vapour barrier shall have a water vapour permeability of not exceeding 0.02 perm.
And have one layer of aluminium, and another layer of white paper laminate
reinforced with fibreglass. The vapour barrier must be factory pre-laminated all
purpose type, pre-sized and suitable for printing.
a. Condensate Drains
No separate vapour barrier shall be applied over the insulation. However,
care shall be taken, to ensure that all joints in the insulation are thoroughly
filled with the insulation adhesive and that there are no gaps in the
longitudinal seams and between the adjoining sections of the insulation.
5. Sealing of Joints
1. All segments of pipe insulation shall be firmly butted against the proceeding sections
and the joint shall be sealed with a butt strip. The butt strip shall be applied with
aluminum pressure sensitive adhesive tape with a minimum width of 3 inch. Joint of
aluminum foil vapour barrier shall be overlapped 4” minimum and sealed with an
approved brand of vapour seal adhesive.
6. Adhesives
1. Adhesives shall be waterproof compounds formulated for long life and suitable for the
particular materials and service temperature specified.
2. Adhesive shall be tested in accordance with BS. 476, Part 3 after uniform application to
asbestos mullboard to the thickness recommended by the manufacturer for the
proposed application and shall meet the following requirements after the
manufacturer’s specified drying time.
Page 33 of 42
Ignitability Index
0
Spread Of Flam Index
0
Heat Evolved Index
0
Heat Evolved Index
0
Smoke Developed Index Less Than
2
3. Adhesive shall be applied strictly in accordance with the manufacturer’s
recommendations for the particular application.
2.8
ACCESS DOORS
1. Access door in masonry ceiling and walls shall have heavy steel frames, steel plated
doors, substantial door stops, concealed butt hinges, brass hinge pins, screwdriver
operated or finger operated catches, and shall be flush projecting hinges or other
parts. Floating or pivot hinges or lift out doors will not be accepted. These minimum
requirements shall be made known to the Builder.
2. Access doors in duct work, casings, or sheet metal partitions shall be of double
construction with insulation of the same general character as adjacent sections of
ductwork, of not less than 20 gauge sheet metal and shall have not less than 15 mm
wide neoprene rubber gaskets around their entire perimeter.
3. Access doors in sheet metal shall be hung on heavy brass-plated flat hinges and shall
be secured in the closed position by means of brass wedge type catches, except as
indicated in paragraph 2.4 below.
4. All hinges shall be so placed to enable the doors to remain open without additional
support. All doors will be hinged with two hinges, and two latches will be used on
doors over 400 mm x 400 mm. In no case shall any access door require removal of
nuts, bolts, screws, wing nuts, wedges or any other screwed or loose devices.
5. Sizes of access doors shall be as shown on the drawings or as shown below. When the
duct is of smaller dimensions than the access door specified, the door shall be the full
width of the duct.
a. 500mm x 1000mm into every duct having one dimension of 1200mm or more.
b. 300mm x 400mm at each supply fan discharge.
c. 300mm x 400mm at each single inlet centrifugal fan suction where the
outward bearing is within the ductwork.
d. 450mm x 600mm at each automatic damper and fire damper.
e. 300mm x 400mm into every run of duct less than 1200mm.
2.9
FIRE STOPPING
1. Firestops
1. Firestop compounds shall be provided for caulk, pour, trowel or pump application.
Material must be capable of sealing openings around single or multiple ducts, cables,
wire or conduits against fire, smoke and toxic gases, and maintaining rating with a
thickness no greater than the structure.
2. The firestop compound shall not contain any solvents or inorganic fibres. The
penetration seal material must be unaffected by moisture and must maintain the
Page 34 of 42
integrity of the floor or wall assembly for its rated time period when tested in
accordance with ASTM E814 or UL 1479 requirement.
3. Firestop system shall consist of a material, or combination of materials, to retain the
integrity of fire-rated construction by maintaining an effective barrier against the
spread of flame, smoke or gases through penetrations in fire-rated barriers. It shall be
used in specific locations as follows:a. Penetration for the passage of duct, cable tray, conduit, and electrical
busways and raceways through fire-rated vertical barriers (walls and
partitions), horizontal barriers (floor slabs and floor/ceiling assemblies), and
vertical services shafts.
b. Locations shown specifically on the drawings or where specified in other
sections of these specification.
2. Damming Material
1. Damming material, shall be provided where required as per manufacturer’s
recommendations.
3. Materials
1. Firestopping materials/systems shall be flexible to allow for normal movement of
building structure and penetrating item(s) without affecting the adhesion or integrity
of the system.
2. Firestopping materials shall not require hazardous waste disposal of used
containers/packages.
3. Firestopping materials shall not free of solvents which will experience shrinkage while
curing.
2.10
SHEET METAL
1. This section sets out the requirements of materials and standards of construction with
respect to ducting and ducting accessories to be used on this project. All ductwork for
air distribution to the various air conditioned spaces shall not be less than the clear
internal dimensions as indicated in the drawing and shall be installed generally as
shown.
2. It is the responsibility of this Contractor to check actual spaces available on site, prior
to fabrication of the ducts. If any departures from the drawings are deemed
necessary, the sub-contractor shall submit details of such departures and reasons to
the engineer for approval. All ductwork installations shall also meet Local Fire
Authority’s requirements.
1. Sheet Metal Ductwork
1. All G.I. sheet ductwork shall be supported and anchored to the building structure in
approved manner using steel hanger’s, anchors, brackets and supports which shall be
fixed to the building structure by means of inserts on expansion shields of adequate
size and number to support the loads imposed thereon.
2. All ducts shall be machine formed, to true dimensions, cross broken on all surfaces
exceeding 12 inches in width and be free from waves, bulges and buckles. Raw and
sharp edges shall be removed from all duct components, and gaskets and other parts
of joints shall not intrude into the air stream. Ductwork shall be constructed so that
branding and other identification marks are displayed on the outside surfaces.
Page 35 of 42
3. The gauge of sheet metal, type of joints and bracings shall be constructed in
accordance to the latest SMACNA standard and its addendum.
2. Sheet Metal Ductwork Design
1. All sheet metal ductwork shall be machine bent and be free from buckles and waves.
On all bends and offsets, changes in duct sizes and direction shall be made in gradual
manner with a maximum 15, unless otherwise shown. Where right-angles bends are
used, double thickness turning vanes shall be incorporated. Full use may be made of
duct transformation around obstruction, local restrictions at beams, etc, provided
guarantees on noise and performance are not thereby voided.
3. Fire Rated Ductwork
1. General
a. Fire rated ductwork shall be provided for ductwork and plenums where
necessary in accordance to Local fire code requirements.
b. Specified fire resistance of the duct shall be applied to the duct installed
system in relation to its material properties, supporting system, duct
fabrication, construction joints and ancillaries in maintaining the integrity of
the duct system.
c. Fire rated ductwork to be approved by the consultant prior to installation.
2. Standards
Comply with the following standards:
a. Surface spread of flame to Class 1 of BS 476 Part 7.
b. Fire propagation to Class O of BS 476 Part 6.
c. Impact test to British Standard 5669.
d. No loss to integrity, insulation and stability of the ductwork system to BS 476
Part 24 or equal for fire inside and outside the ducts.
e. Duct construction to be tested to DW 143 High Velocity Table D leakage
standards.
f.
Two (2) hours integrity test to fire inside duct to ISO 6944 or equal.
g. Two (2) hours integrity test to fire outside duct to BS 476 Part 24 or equal.
h. Insulation property with the application of the mineral wool of minimum
60mm thick.
3. Material Properties
a. Fire resistance of the ducts shall be minimum two (2) hours unless otherwise
noted elsewhere in the specification or drawings.
b. Sizing of the duct supporting system shall take into account of the reduce
tensile strength of the steel supports as the temperature increases.
4. Kitchen Exhaust Ductwork
1. Construct kitchen exhaust duct of minimum 1.2mm BI steel sheet with welded joints.
Provide double wall insulated access doors for cleaning at intervals of 6m, at every
change of direction, at each duct junction and as required by local authority
requirements.
Page 36 of 42
2. For each kitchen exhaust duct riser, a 25 mm diameter G.I. pipe of 600 mm length with
a ball valve shall be connected to the base of the duct riser for draining kitchen grease.
5. Outdoor Ductwork
1. Coat outdoor ductwork exposed to the weather with an approved weather protective
coating.
6. Joints
1. Longitudinal joints of sheet metal ductwork shall be made at corners only with
Pittsbury or equally approved seams. Transverse joints either shop-made or fieldmade shall be flanged on ducts 25 and above with matching angles bolted together.
Angles shall be of size not less than 1’ x 1” x 1/8” and shall be riveted to ducts. Angles
shall be coated with approved non-setting compound before bolting up. No ductwork
joints, bends or fittings shall be permitted within the thickness of the wall, floor or
ceiling structures.
7. Flexible Connections
1. Air tight pre-insulated flexible connections consisting of two layers of 16 oz/sq.ft.
canvas or neoprene impregnated terylene shall be provided on the suction and
discharge connection to each fan and all expansion and settlement joints in the
building structure. The connection shall be arranged to permit renewal of canvas or
neoprene impregnated terylene without dismantling the ductwork. In fire hazardous
locations, glass fabric reinforced with wire or approved equivalent shall be used.
2. The fibreglass thermal insulation shall conform to the requirements listed below:a. The thermal conductivity of the insulated materials shall not be greater than
0.036 watt per meter degree Kelvin at a mean temperature of 20 deg. C.
b. The density of the insulation materials shall be 32 kg/m3 minimum.
c. The insulation materials must be classified as non-combustible by the Fire
Authority and tested in accordance to BS 476: Part 4 - 1970.
d. The external insulation shall be faced with fire resistance double sided
reinforced aluminium foil.
3. The entire assembly shall be capable of passing the test of flame spread to Class `O’
rating.
8. Splitters
1. Splitters for adjustment or air distribution to the respective branches shall be installed
whether indicated on the drawings or not.
2. Splitter shall be made from not less than 22gage galvanised steel in double streamline
section securely fastened to a ½ inch steel rod which is pivoted in bronze or nylon
bushes fixed to the duct and provided with a lockable type quadrant for splitters of
length under 20 inches. Splitters of 20 inches and over shall be steel rods hinged to
the air entering edge and passing through a suitable clamp on the side of the large
duct to permit positional adjustment and provide rigid anchorage in any position.
3. Splitters may be of the fixed type if the branch duct serves only one outlet diffuser but
must be of the adjustable type if more than one outlet is served by the same branch
duct.
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2.11
DAMPERS
1. Dampers shall be design, supply, packing for transport, delivery to site, unloading,
installation, connecting, final testing and putting into commission, handing-over in
approved working order and maintenance, in the sizes, types and locations as required
and as may be necessary for the smooth functioning of the air conditioning system.
2. Fully furnished samples of types of dampers to be installed shall be submitted to the
Engineer for approval prior to ordering.
1. Butterfly Opposed Blade Dampers
1. Butterfly dampers shall be constructed not less than 18gage galvanised iron in double
streamline section, securely fastened to 40 mm mild steel rod pivoted in bronze or
nylon bushes fixed to the duct and provided with a lockable type quadrant. The
quadrant shall be clearly marked to indicate the position of the damper.
2. The size of the damper shall be sufficient to close off the duct in the shut position. The
main damper blades shall not exceed 254mm (10 inches) in width or 762mm (30
inches) in length between bearings.
2. Motorised Volume Control Dampers
1. Motorised volume control dampers shall be the opposed blade parallel action type.
The frame and blades shall be fabricated with not less than 16 gauge corrosion
resistant galvanised steel or extruded aluminium.
2. Both the side and top rail extrusions shall have reinforcing ribs for rigidity. The blades
shall be actuated by a drive shaft attached to a stainless steel slide bar.
3. Each opposed blade shall set at both top and bottom in nylon bearings to eliminate
metal to metal contact at the critical pivot points. The blade configuration shall be
such that when fully closed, each blade interlocks with adjacent blades to ensure a
positive seal. The last blade on either end shall also interlock against the reinforcing
rib of the side rail when fully closed.
4. The motor shall be externally mounted, and suitable for 24V, 60 hertz supply.
3. Fire Dampers
1. All fire dampers to be installed shall be UL listed and approved for use for Fire Services.
The successful Tenderer shall submit to the Engineer, a certified photocopy of valid UL
certificate stating the fire dampers hour rating before installation work may proceed.
2. Fire dampers shall be supplied and fitted in all points where ducts enter through floor,
fire walls and party wall and in all locations as may be required by the local Authorities,
whether indicated or not on the drawings.
3. All fire dampers shall be of the multi-louvred plate gravity type and shall be
constructed of not less than 18 inches mild steel plate mounted on ½ inch diameter
mild steel shaft. The shaft shall rotate in sintered bronze bearings. After fabrication,
the damper and blade shall be chemically de-rusted and finished with two coats of zinc
chromate paint. Its break at (41C) 105F and shall lock shut and be manually
reopened, having external indicator of damper position.
4. Fire dampers for smoke spill and lobby pressurization application shall be of extra low
leakage type.
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4. Pressure Relief Dampers
1. Pressure relief dampers shall be of single blade, fabricated from heavy gauge corrosion
resistant galvanised steel or extruded aluminium. The movement of pressure relief
dampers shall be controlled by the bushing on the weight arm which can be adjusted
at site and lockable.
2. Barometric adjustment to set the correct position of bushing shall be done on site.
The damper shall be installed with a weatherproof cowl if exposed to weather.
5. Non-Return Dampers (Back draft dampers)
1. Non-return dampers shall be provided on all external wall openings of the exhaust fan
systems and also in ducts on suction sides of duplicate fan installations.
2. The dampers shall be rigid vibration-less construction. The shaft shall be of steel and
the bearings shall be of graphite impregnated bronze bushes or of similar bearings.
3. Damper shall be tipped with 6mm (¼ inch) thick hard felt to ensure silent operation.
2.12
AIR OUTLETS AND INLETS
1. Design, supply, packing for transport, delivery to site, unloading, installation,
connecting, final testing and putting into commission, handing-over in approved
working order and maintenance supply air, return air, and exhaust registers and
diffusers as required, to be ADC or NATA rated. Brands indicated in the Base
Specifications can be imported type including those manufactured under license.
2. Supply and install anti-smudge gaskets to all exhaust diffusers.
3. Supply, return and exhaust registers and diffusers shall be aluminium and finished in
colour as selected by Architect.
4. Samples of finishes shall be submitted for approval.
5. The inside of all components and surfaces of all diffusers, grilles and registers shall be
painted matt black.
6. Supply and install sheet metal plenum boxes at ceiling mounted supply diffusers and
grilles as specified.
7. All diffusers, registers and grilles shall be selected to meet the noise levels as specified.
8. Supply registers shall be selected for air throws to suit the dimensions of the space
served, so that air movement in areas below 1.8 m above the floor, and more than 300
m from walls does not exceed 0.25 m/s.
1. Linear Diffusers
1. Linear diffusers shall be of continuous slot type, with precision butt joints. When
installed, they shall present a straight appearance without misalignment distortion.
2. Linear diffuser shall be adopted for side throw and down thrust applications.
3. Diffusers shall have natural anodised aluminium finish.
2. Adjustment and Measurement Unit Specification
1. The unit shall have air flow adjustment and measurement abilities at the duct collar
branching to the diffusers. The unit shall be made of hot galvanised steel and
incorporate rubber gaskets surrounding the spigot joint to ensure leak proof
installation.
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2. There must be published performance data comprising sound level, throw pattern and
pressure loss for the unit.
3. Toilet Exhaust
1. Toilet exhaust registers shall be of aluminium type.
4. Ceiling Diffusers
1. Ceiling mounted supply diffusers shall be aluminium and of the two, three or four way
blow louver faced or round type with either square or round duct connections as
applicable.
5. Wall Grille
1. Wall mounted side blow supply and return registers and grillers shall be aluminium
and of the universal double deflection type with plenum box for either square or round
duct connections as applicable, with opposed blade damper behind. All grille fixings
shall be concealed.
6. Access Doors – General
1. Access doors shall be installed at every air chamber, filter section, fire damper,
automatic damper, valves, temperature control equipment, fan bearings, turning
vanes, traps, coils, etc. to permit inspection, operation and maintenance.
2. Access door shall be exactly located with respect to their respective equipment. Any
access door not close to its equipment will not be accepted.
3. Pilot tubes shall be provided for by circular gasketted access doors over circular cutouts at each fan suction and wherever it is necessary to measure performance. Such
holes shall be so located to enable accurate measurements to be taken.
4. This contractor shall submit locations, sizes and design of all access doors in finished
surfaces and exposed areas to the Employer’s Representative for approval in good
time to enable them to be incorporated into the construction.
5. To show any access doors required in building construction on shop drawings.
7. Kitchen Hood
1. Kitchen Hood shall be of stainless steel type or per architectural preferred type.
3.0
EXECUTION
3.1
Examination
After becoming familiar with all details of the work, perform a verification of dimensions
in the field, and advise the Project Management group of any discrepancy before
performing any work.
3.2
Installation
Pipe and fitting installation shall conform to the requirements of ASME B31.1. Pipe shall
be cut accurately to measurements established at the jobsite, and worked into place
without springing or forcing, completely clearing all windows, doors, and other openings.
Cutting or other weakening of the building structure to facilitate piping installation will not
be permitted without written approval. Pipe or tubing shall be cut square, shall have
burrs removed by reaming, and shall permit free expansion and contraction without
causing damage to the building structure, pipe, joints, or hangers.
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3.3
Cleaning of Systems
Pipe:
Clean uncontaminated system(s) by evacuation and purging procedures currently
recommended by refrigerant and refrigeration equipment manufacturers, and as
specified herein, to remove small amounts of air and moisture. Systems containing
moderate amounts of air, moisture, contaminated refrigerant, or any foreign matter shall
be considered contaminated systems. Restoring contaminated systems to clean
condition including disassembly, component replacement, evacuation, flushing, purging,
and re-charging, shall be performed using currently approved refrigerant and
refrigeration manufacturer's procedures and at no additional cost to the Government as
determined by the Contracting Officer. Water shall not be used in any procedure or test.
Duct:
Clean fan coil unit and ductwork prior to the duct system unit-by-unit as it is installed.
Clean external surfaces of foreign substance which may cause corrosive deterioration of
facing.
Temporary Closure: At ends of ducts which are not connected to equipment or
distribution devices at time of ductwork installation, cover with polyethylene film or other
covering which will keep the system clean until installation is completed.
3.4
Safety Procedure
Ventilate work area, avoiding skin contact by using solvent resistant gloves. Observe
precautions and warnings on manufacturer's product labels and comply with
requirements of OSHA 29.
3.5
Refrigerant Piping Tests
After all components of the refrigerant system have been installed and connected,
subject the entire refrigeration system to pneumatic, evacuation, and startup tests as
described herein. Conduct tests in the presence of the Contracting Officer. Water and
electricity required for the tests will be furnished by the Government. Provide all
material, equipment, instruments, and personnel required for the test. Provide the
services of a qualified technician, as required, to perform all tests and procedures
indicated herein.
3.6
Testing of HVAC Systems
Preliminary Procedures
Prior to pneumatic testing, equipment which has been factory tested and refrigerant
charged as well as equipment which could be damaged or cause personnel injury by
imposed test pressure, positive or negative, shall be isolated from the test pressure or
removed from the system. Safety relief valves and rupture discs, where not part of
factory sealed systems, shall be removed and openings capped or plugged.
1. Pneumatic Test
Pressure control and excess pressure protection shall be provided at the source of test
pressure. Valves shall be wide open, except those leading to the atmosphere. Test gas
shall be dry nitrogen, with minus 55 degrees C (minus 70 degree F) dewpoint and less
than 5 ppm oil. Test pressure shall be applied in two stages before any refrigerant pipe
is insulated or covered. First stage test shall be at 69 kPa (10 psi) with every joint being
tested with a thick soap or color indicating solution. Second stage tests shall raise the
system to the minimum refrigerant leakage test pressure specified in ANSI/ASHRAE 15
& 34 with a maximum test pressure 25 percent greater. Pressure above 690 KPa (100
psig) shall be raised in 10 percent increments with a pressure acclimatizing period
between increments. The initial test pressure shall be recorded along with the ambient
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temperature to which the system is exposed. Final test pressures of the second stage
shall be maintained on the system for a minimum of 24 hours. At the end of the 24 hour
period, the system pressure will be recorded along with the ambient temperature to
which the system is exposed. A correction factor of 2 kPa (0.3 psi) will be allowed for
each degree C change between test space initial and final ambient temperature, plus for
increase and minus for a decrease. If the corrected system pressure is not exactly equal
to the initial system test pressure, then the system shall be investigated for leaking
joints. To repair leaks, the joint shall be taken apart, thoroughly cleaned, and
reconstructed as a new joint. Joints repaired by caulking, remelting, or backwelding/brazing shall not be acceptable. Following repair, the entire system shall be
retested using the pneumatic tests described above. The entire system shall be
reassembled once the pneumatic tests are satisfactorily completed.
2. Evacuation Test
Following satisfactory completion of the pneumatic tests, the pressure shall be relieved
and the entire system shall be evacuated to an absolute pressure of 300 micrometers.
During evacuation of the system, the ambient temperature shall be higher than 2
degrees C. No more than one system shall be evacuated at one time by one vacuum
pump. Once the desired vacuum has been reached, the vacuum line shall be closed
and the system shall stand for 1 hour. If the pressure rises over 500 micrometers after
the 1 hour period, then the system shall be evacuated again down to 300 micrometers
and let set for another 1 hour period. The system shall not be charged until a vacuum of
at least 500 micrometers is maintained for a period of 1 hour without the assistance of a
vacuum line. If during the testing the pressure continues to rise, check the system for
leaks, repair as required, and repeat the evacuation procedure. During evacuation,
pressures shall be recorded by a thermocouple-type, electronic-type, or a calibratedmicrometer type gauge.
3. System Charging and Startup Test
Following satisfactory completion of the evacuation tests, the system shall be charged
with the required amount of refrigerant 410A by raising pressure to normal operating
pressure and in accordance with manufacturer's procedures. Following charging, the
system shall operate with high-side and low-side pressures and corresponding
refrigerant temperatures, at design or improved values. The entire system shall be
tested for leaks.
4. Refrigerant Leakage
If a refrigerant leak is discovered after the system has been charged, the leaking portion
of the system shall immediately be isolated from the remainder of the system and the
refrigerant pumped into the system receiver or other suitable container. Under no
circumstances shall the refrigerant be discharged into the atmosphere.
5. Contractor's Responsibility
At all times during the installation and testing of the refrigeration system, take steps to
prevent the release of refrigerants into the atmosphere. The steps shall include, but not
be limited to, procedures which will minimize the release of refrigerants to the
atmosphere and the use of refrigerant recovery devices to remove refrigerant from the
system and store the refrigerant for reuse or reclaim. At no time shall more than 85 g of
refrigerant be released to the atmosphere in any one occurrence. Any system leaks
within the first year shall be repaired in accordance with the requirements herein at no
cost to the client including material, labor, and refrigerant if the leak is the result of
defective equipment, material, or installation.
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