01/29/16
DESIGN NO. _____
SECTION 15855
COMMERCIAL PACKAGED ROOFTOP HEATING AND COOLING UNITS
[Designer Note: (Remove from the Specification) 15855 RTUs will only
be used on CIP projects. (If approved for use on capacity projects,
provide “Maintenance Contract” article from custom spec.)
CIP
projects that utilize digital controls will only have stand-alone
digital controls.
There will not be any network at all.
The
commercial RTUs must use OEM controllers which may be non-Lon
controllers. For non-native Lon controllers, the A/E of Record needs
to determine at design time and again at submittal time that a Lon
gateway is available (but not provided) to be able to integrate the
RTUs into a possible future Lon BMS/DDC network. RTUs that are not
native Lon and for which there is no gateway presently available,
should not be utilized on CIP projects.]
13
23
PART 1 - GENERAL
1.01
DESCRIPTION OF WORK
A.
1.02
14
COMMISSIONING REQUIREMENTS
A.
1.03
1.05
During construction, the HVAC Contractor shall comply with
the Indoor Air Quality (IAQ) Requirements indicated in
Contract Specifications Section S01550.
RELATED SECTIONS
A.
Division 15 Sections
B.
Division 16 Sections
DESIGN REQUIREMENTS
A.
NYCSCA
HVAC Contractor shall comply with the Commissioning
Requirements of Contract Specification Section S01660.
INDOOR AIR QUAILTY (IAQ) REQUIREMENTS DURING CONSTRUCTION
A.
1.04
Provide packaged commercial type rooftop heating and
cooling units as specified herein, as shown on the
Drawings and as needed for a complete and proper
installation. Product specific requirements are contained
herein; Section 15501, General Provisions for Heating,
Ventilating and Air Conditioning Work, shall be referred
to for general requirements.
Provide control devices as coordinated by the Mechanical
Contractor (MC) and the Temperature Controls Contractor
(TCC). All digital controls shall be able to function in a
stand-alone mode without any network connections. There are
various optional methods for achieving the required
seamless integrated controls.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 1
01/29/16
DESIGN NO. _____
B.
It is recognized that controls furnished by other vendors
and by trades other than mechanical necessitate that both
the General Contractor (GC) and Mechanical Contractor (MC)
actively facilitate the coordination of controls between
all parties. It is the responsibility of each vendor
furnishing, a digital controller for its proper operation,
configuration,
and
compliance
with
all
appropriate
specification sections. It is the responsibility of each
vendor to comply with the intent of this specification
section relating to, but not limited to providing direct,
technical assistance to the TCC to connect the field
sensors,
technical
performance,
warranties,
services
response, etc.
The MC and the GC shall determine which combination of
providing digital controls best meets the intent of the
specification. The combination is the responsibility of the
Mechanical Contractor however the final combination must
comply with the specified requirements for each piece of
mechanical equipment as described below and in the
respective equipment specification. The required control
interoperability remains identical for each of the
following options, listed in decreasing desirability.
1.
The OEM may furnish and install an approved nativeLonWorks controller and the specified control devices
including all wiring internal within the unitary
equipment, including all low-voltage power. The I/O
points to be furnished are as described on the plans
and
specifications
including
the
sequence
of
operation. The unit will be delivered to the site
ready for connection of field-based control devices.
The OEM shall furnish to the Authority a licensed
fully-functional copy of the toolset necessary for
communication with and the adjustment of their
LonWorks controller.
2.
Commercial unitary equipment OEMs may furnish and
install an approved non-LonWorks controller together
with the specified control devices, including all
wiring internal to the unitary equipment, including
all low-voltage power. The I/O points to be furnished
are as described on the plans and specifications
including the sequence of operation. The equipment
will be delivered to the site ready for termination of
field-based control devices. The OEM shall furnish to
the Authority a licensed, full-functional copy of the
toolset necessary for communication with and the
adjustment of their controller.
7
1.06
SUPPLEMENTAL SUBMITTALS
A.
Product Data
1.
NYCSCA
Manufacturer’s product data
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 2
01/29/16
B.
8
9
DESIGN NO. _____
2.
Fan Curves
3.
Compressor Efficiency Data
4.
Gas Fired Unit Efficiency Data
5.
Installation Instructions
6.
Start-up Instructions
7.
Radiated, supply discharge and return inlet computer
generated sound power levels
Shop Drawings
1.
Include with the shop drawings mounting details for
securing
and
flashing
roof
curb
and/or
duct
penetrations to roof structure. Indicate coordination
requirements with roof membrane system.
2.
Wiring Diagrams: Submit manufacturer's electrical
requirements for power supply wiring to packaged
heating and cooling units by the Division 16
electrical contractor. Submit manufacturer's wiring
diagrams for interlock and control wiring required for
final installation of packaged heating and cooling
units and controls. Clearly differentiate between
portions of wiring that are factory-installed and
portions to be field-installed by the Temperature
Controls System Contractor (TCC).
3.
Piping Diagrams: Submit manufacturer’s gas piping
requirements for fuel supply piping for packaged
rooftop units. Submit manufacturer’s diagrams for
final installation of package rooftop units. Clearly
indicate
field
tie
in
points
and
capacity
requirements.
4.
Provide gas train shop fabrication drawings.
C.
Coordination Drawings: Rooftop units to roof-curb mounting
details drawn to scale, on which the following items are
shown and coordinated with each other, based on input from
installers of the items involved: size and location of
rooftop unit mounting rails and anchor points and methods
for
anchoring
units
to
roof
curb;
required
roof
penetrations for ducts, pipes, and electrical raceways,
including size and location of each penetration.
D.
Test Reports
1.
NYCSCA
Manufacturers’ factory test results.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 3
01/29/16
E.
22
F.
DESIGN NO. _____
Certifications
1.
Contractor’s start-up and demonstration affidavit.
2.
Certification
of
operability
for
smoke
control
systems that are to remain operable following the
design earthquake ground motion per Section 13.2.2 of
ASCE 7-10.
Maintenance Materials
1.
2.
1.07
G.
Operation and Maintenance Data to include in emergency,
operation, and maintenance manuals; and the maintenance
data specified in Section 15501.
H.
Warranties specified in this Section
SUPPLEMENTAL QUALITY ASSURANCE
A.
Codes and Standards
1.
ARI Compliance: Provide capacity ratings for packaged
heating and cooling units in accordance with ARI
Standard 360: Standard for Commercial and Industrial
Unitary Air-Conditioning Equipment.
2.
Refrigeration
system
shall
be
constructed
in
accordance with ASHRAE 15-2010: Safety Standard for
Refrigeration Systems as modified by Chapter 11 of the
2014 NYC Mechanical Code.
3.
Refrigeration equipment shall be listed and labeled to
UL 1995-1998. UL listing shall be indicated on the
Shop Drawings.
4.
5.
NYCSCA
Spare Filters
Spare Belts
Packaged rooftop units shall comply with the EER
requirements of the 2014 edition of the New York City
Energy Conservation Code, ARI 340/360, and ASHRAE
90.1-2010 as modified by Appendix A of the 2014
NYCECC.
All appliances regulated by the New York City
Construction Codes shall be listed and labeled
(reference Sections MC 301.4 and MC 301.6 of the 2014
NYC Mechanical Code). Testing of material shall be in
accordance
with
Section
§28-113
of
the
NYC
Administrative Code (reference Section MC 301.5).
Whenever the NYC Construction Codes or the Rules of
the Department of Buildings requires that material be
listed or labeled and material proposed to be used is
not so listed or labeled, the use of such material
shall be subject to prior approval by the Commissioner
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 4
01/29/16
DESIGN NO. _____
(Office of Technical Certification and Research OTCR)
and such material shall be used only to the extent set
forth in such approval. Materials that were previously
approved by the Board of Standards and Appeal (BSA) or
by the Department (MEA) before the effective date of
the NYC Construction Codes may continue to be used,
but only to the extent set forth in such approval, and
only if such approval is not specifically amended or
repealed by the Commissioner.
B.
1.08
Before submitting any equipment shop
the
HVAC
Contractor,
Automatic
Contractor and the Equipment Vendor
coordinate the controls required for
COORDINATION
A.
9
1
Coordinate size, location, and installation of rooftop unit
curbs and dunnage supports with roof installer.
1.
1.09
Coordinate
installation
of
restrained
vibration
isolation and seismic roof-curbs (Reference Section
15503 or 15504).
MAINTENANCE
A.
1.10
Provide with each unit, one spare set of air filters.
Suitable box and label spare as to their usage. Provide
also spare belts for belt-driver equipment.
WARRANTY
A.
24
25
drawings for approval,
Temperature
Controls
and Manufacturer shall
the system.
1.11
In addition the warranties specified in Section G01740 and
15501, provide written warranty signed by manufacturer,
agreeing to replace/repair motors/compressors that have
inadequate and defective materials and workmanship including
leakage, breakage, improper assembly, or failure to perform
as required, within the warranty period.
All warranties
shall start at the Date of Substantial Completion. Five-(5)
year warranty shall be provided for the refrigeration
compressors. All total enthalpy energy recovery wheels shall
be warranted for parts and labor by the manufacturer for a
period of 60 months.
Other components within the rooftop
units shall have a two-(2) year warranty.
PREVENTATIVE MAINTENANCE
A.
NYCSCA
Provide a two (2) year full preventative maintenance
contract on the rooftop unit (RTU) equipment equipped with
furnaces and compressors. The two year term shall commence
at Substantial Completion of the project or after
submission of correctly completed applicable guarantee and
warrantee documentation for the units, whichever is later.
The Contractor shall perform all maintenance on the
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 5
01/29/16
DESIGN NO. _____
equipment
contract.
B.
NYCSCA
until
start
of
the
preventative
maintenance
1.
The firm engaged for the preventative maintenance
contract
must
be
authorized
by
the
equipment
manufacturer to provide such maintenance.
The
maintenance work shall be performed by trained
personnel
directly
employed
and
supervised
by
manufacturer’s authorized maintenance contractor.
2.
The cost of this preventative maintenance contract
shall be included in the bid price.
3.
This maintenance contract shall be managed
administered by the Department of Education (DOE)
4.
The preventative maintenance requirements for the
specified equipment shall be in accordance with the
equipment
manufacturer’s
preventative
maintenance
requirements
(as
defined
in
the
manufacturer’s
Installation and Operations Manual) and as specified
herein.
5.
Perform scheduled maintenance work during regular
working hours. All work shall be coordinated with the
Custodians Office.
and
Preventative Maintenance Procedures
1.
Preventative maintenance procedures shall follow all
safety and O.S.H.A. requirements.
2.
The Contractor shall submit for the Designer of
Record’s approval a preventative maintenance plan and
schedule,
conforming
to
either
the
equipment
manufacturer’s preventative maintenance requirements
and schedule or as indicated below, whichever is more
rigorous and stringent.
All system components
requiring preventative maintenance shall be included.
The plan shall identify:
a.
the equipment and manufacturer
b.
components requiring maintenance
c.
type and description
performed.
d.
maintenance interval
e.
maintenance contractor approved by the equipment
manufacturer (include certifying documentation by
the equipment manufacturer)
of
maintenance
to
be
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 6
01/29/16
DESIGN NO. _____
f.
component replacement schedule
(i.e. belts, bearings, etc.)
g.
filter replacement schedule
h.
lubrication schedule
i.
lubrication types
applicable
3.
The plan shall include a copy of the equipment
manufacturer’s published maintenance requirements and
schedule.
4.
The costs of all parts requiring periodic replacement
(i.e. filters, belts, etc.) are to be included in the
preventative
maintenance
contract.
Supply
all
necessary lubricants, filters, refrigerants, cleaning
materials, etc. as required to keep the system in good
working order during the preventative maintenance
period.
5.
Maintenance of equipment and parts shall be either as
per the manufacturer’s maintenance requirements and
schedule as published in their Installation and
Operations Manual or as indicated herein, whichever is
more rigorous and stringent.
Any preventative
maintenance defined in the manufacturer’s Installation
and Operations Manual for components not defined below
shall be followed and included in the plan.
The
interval between preventative maintenance visits shall
be as defined in the manufacturer’s Installation and
Operations Manual, but in no case shall the interval
between maintenance visits be greater than three (3)
months.
a.
NYCSCA
as
RTU – Casing/Cabinet Integrity
1)
Inspect for defective
access doors, clogged
screens.
integral dampers,
louvers and bird
2)
Clean, align and lubricate as required.
3)
Replace screws, linkage or latches and patch
or replace gaskets.
4)
Inspect
for
broken,
loose
or
missing
connections and parts. Correct as required.
5)
Inspect for water leaks through rooftop unit
enclosure. Seal as required.
6)
Inspect for improper setting of outside air,
recirculation and exhaust dampers. Correct
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 7
01/29/16
DESIGN NO. _____
as required by cleaning and lubricating
pivot points and actuator mechanisms.
7)
b.
c.
NYCSCA
Inspect guards, casing, supports, platforms,
and mounting bolts.
RTU – Filters
1)
Replace pre-filters and final filters as per
manufacturer’s maintenance schedule, but as
a minimum at every 6 months.
2)
Check and log
filter set.
pressure
drop
across
the
RTU – Condenser, Supply and Return Fans & Motors
1)
Perform maintenance at each visit. Report
all
findings
and
non-maintenance
deficiencies to the custodian and note in
the log.
2)
Remove all debris from fan section and unit
in general and check all fan safeties
including
but
not
limited
to
thermal
overloads and static pressure sensors.
Adjust as needed.
3)
Visually inspect all fans. Make sure nothing
is blocking the fan blades and check for
obvious signs of damage.
4)
Measure each fan’s flow by measuring the
total static pressure change across the fan
and measure fan shaft rotation with a
tachometer. Use manufacturer’s fan curve to
determine the flow based on measured fan
speed and pressure change across the fan.
5)
Verify that the fan motor amperage is
compliant with manufacturer’s fan curves for
the measured flow magnitude. Verify that the
fan motor is running in the correct
direction.
6)
Check that the wire leads on the motor have
not been switched. Monitor condenser fan
cycling. Rapid on-off cycling of a condenser
fan (three minutes or less) leads to poor
control of the refrigeration system and can
wear out the fan motor prematurely.
7)
Check the settings on the condenser
controller and adjust as required.
fan
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 8
01/29/16
DESIGN NO. _____
d.
NYCSCA
8)
Check for excessive bearing temperatures,
noise and vibration indicating inadequate
lubrication of bearings and moving parts.
9)
Fill all grease dispensers or oil cups at
each visit.
If fan bearings are sleeve
bearings, lightly oil with the recommended
lubricant (Do not over lubricate). Follow
manufacturer’s
lubrication
interval
and
recommended lubricant type. Fans equipped
with
self-lubricating
bearings
(sealedcassette ball-bearing cartridges preloaded
with grease) are not to be re-greased.
10)
Grease any conventional ball bearings. Open
the drain plug and inject grease through the
fill fitting until clean grease comes out of
the drain.
11)
Clean fan/impeller blades.
12)
Adjust belts to provide proper belt tension.
Belts should be aligned with a straightedge
to prevent lateral wear. Change belts as
required depending on wear. All belts shall
be replaced as a minimum at every year upon
commencement of the maintenance contract.
13)
Check fan vibration isolators.
RTU - Refrigeration Cycle
1)
Clean condenser coils at each visit. Power
Wash with a cleaning solution in a highpressure water spray.
(Spray-on cleaning
solutions that are intended to be used with
a brush and a hose are not adequate for
condenser coils, even though they may
brighten the outer surface.)
2)
Clean evaporator coils at each visit.
Clean/Brush with a quality cleaning solution
allowing an appropriate dwell time necessary
to effectively remove all microorganisms/
biofilms. The entire air flow path shall be
treated with a germicide once it is cleaned
to
assure
the
unit
remains
free
of
microorganisms
between
cleanings.
Check
condensate
drain
piping
(multiple
connections) and verify condensate drain
pans
are
clean.
Log
each
coil
air
temperature
change
and
each
coil
air
pressure drop.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 9
01/29/16
DESIGN NO. _____
3)
e.
f.
NYCSCA
Check compressor. Check crank case heater
operation and compressor oil level. Check
expansion valves. Check positive pressure
forced lubrication system. Check hot gas
reheating coil with diverting modulating
valves.
Check
high
limit
thermostat
condition settings. Check refrigerant gas
pressure.
If below recommended level, add
refrigerant of same type to the correct
level. Check hot gas bypass controls. Log
each coil air temperature change and each
coil air pressure drop. Check compressor
vibration isolators.
Report all findings
and non-maintenance deficiencies to the
custodian and include in the maintenance
log.
RTU - Furnace
1)
Perform during each maintenance visit.
2)
Check gas piping connections. Verify secure
connectivity & supports. Check gas pressure.
3)
Check ignition control and burner operation
sequence.
Check
and
calibrate
safety
controls. Check power supply and tighten all
electrical connections. Check air intake
hoods and (screens). Check forced or induced
draft blower/ motor assembly. Check spark
detector. Inspect heat exchanger surfaces.
Report all findings and non-maintenance
deficiencies to the custodian and include in
the maintenance log.
RTU – Integral Smoke Detector/Smoke Damper/Fire
Damper
1)
Perform a minimum of twice a year.
2)
Check and make sure smoke detectors and
dampers are functioning properly in the RTU.
Check smoke detectors with magnet or smoke
can. Check dampers close upon activation
from the Fire Alarm Control Panel.
Report
all
findings
and
non-maintenance
deficiencies to the custodian and include in
the maintenance log.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 10
01/29/16
DESIGN NO. _____
g.
RTU – Piping
1)
h.
i.
Inspect for corrosion at each visit and
report all findings and non-maintenance
deficiencies to the custodian and include in
the maintenance log.
RTU – Wiring/Power
1)
Inspect for wiring and electrical defects at
each visit. Inspect for loose connections;
charred, frayed, broken, or wet insulation;
short
circuits;
lose
or
weak
contact
springs; worn or pitted contacts; and other
deficiencies.
2)
Adjust settings; tighten connections; clean
contacts and adjust alignment.
3)
Inspect and test all power supplies. Record
all voltage readings. Check all relays and
terminal connections. Clean/wipe down panel
face. Check variable frequency drives on
units.
4)
Variable Frequency Drives (VFD): Check
integral cooling fan for functionality.
Clean air inlet filter. Vacuum off dust from
printed circuit boards.
5)
Report all findings and non-maintenance
deficiencies to the custodian and include in
the maintenance log.
RTU – Integral OEM Provided Sensors
Check sensor calibration at each
visit and recalibrate if necessary.
NYCSCA
maintenance
6.
During each preventative maintenance visit and in
addition to the preventative maintenance recommended
by
the
equipment
manufacturer,
the
qualified
technician shall also activate and inspect all
components
of
the
equipment
for
wear,
leaks,
condition, operation, and report findings in the log
and directly to the custodian.
7.
During each preventative maintenance visit, the
maintenance technician shall make all necessary
adjustments as necessary to meet the performance
requirements as specified in the manufacturer’s
Installation and Operation Manual.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 11
01/29/16
DESIGN NO. _____
C.
The preventative maintenance contractor shall advise the
custodian
of
every
preventative
maintenance
visit,
including any material that was used, as well as any
deficiencies noted in the system.
1.
2.
D.
The
technician
shall
maintain
a
visit
log(s)
indicating,
for
each
unit
covered
under
the
maintenance contract, the following:
a.
date of visit
b.
the unit (name/location etc.)
c.
component(s) receiving the maintenance
d.
maintenance performed
e.
lubrication performed
f.
parts and filters replaced
g.
condition and operability of all components
h.
date of next required maintenance
i.
deficiencies noted and reported to the custodian.
Copies of log(s) shall be kept in the custodian’s
office. The originals shall be maintained by the
maintenance contractor until the expiration date of
the maintenance contract at which time the originals
shall be turned over to the custodian.
End of the Preventative Maintenance Contract
Approximately three (3) months prior to the end of the
maintenance contract term, the DOE and the preventative
maintenance contractor shall make a thorough inspection of
all rooftop unit equipment covered under the Contract. At
the conclusion of this inspection, the DOE will give the
preventative maintenance contractor written notice of any
maintenance
deficiencies
for
which
the
maintenance
contractor was responsible.
The preventative maintenance
contractor shall be responsible for correction of these
maintenance deficiencies within 30 days after receipt of
such notice. Other than the referenced walk through prior
to the end of preventative maintenance period, the DOE may
conduct
inspections
during
the
2-year
preventative
maintenance
period
and
the
preventative
maintenance
Contractor
shall
comply
and
clear
any
maintenance
deficiencies found within 30 days after receipt of such
notice.
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 12
01/29/16
DESIGN NO. _____
PART 2 - PRODUCTS
2.01
GENERAL
A.
3
2.02
Provide rooftop air conditioners with gas fired heating,
air-cooled, direct expansion refrigeration for cooling.
Units shall be weatherproof and designed for outside
mounting on a roof. Units shall supply the conditioned air
and return the required air as shown on the Drawings.
Condenser fan/coil section shall be designed with vertical
discharge for minimum sound levels.
COMMERCIAL ROOFTOP UNITS
A.
2
12
24
B.
Roof top unit gas fired heating and electric cooling:
Factory assembled, piped, internally wired, fully charged
and factory tested; designed for exterior installation;
consisting of compressor, indoor and outside refrigerant
coils, R-407C or R-410A refrigerant charge, supply fan,
exhaust fan, outside coil fan, gas burner, electronic
refrigeration, operating controls, filters, and dampers.
Article 1.05 above describes the various options regarding
how the controllers may be furnished and installed.
Equipment manufacturer has the responsibility of verifying
and
providing
the
environmental
conditions
that the
controllers must operate under. The equipment manufacturer
shall provide auxiliary heating/cooling for the control
panel enclosure and/or vestibule if required to guarantee
that the required controller operating environmental
conditions are provided during all occupied and unoccupied
cycles when the equipment cycles intermittently to meet the
setback/setup conditions.
Casing: Galvanized-steel construction with enamel paint
finish, removable panels or access doors with neoprene
gaskets for inspection and access to internal parts, 1/2”
minimum
thermal
insulation
thickness,
knockouts
for
electrical and piping connections, exterior condensate
drain connection, and lifting lugs. All gas piping and
electric power shall enter the unit cabinet at a single
location.
For
units
greater
than
20
tons,
provide
doublewall galvanized sheet metal construction with minimum 1”
thick thermal insulation, with perforated-metal liner.
Thermal insulation may be a fiber-free polyamide open cell
foam or fiberglass. If fiberglass lining is used, it shall
be covered with a matte-faced neoprene covering and sealed
with an acrylic polymer. Surface burning characteristics
shall have a flame spread index less than 25 and smoke
developed index less than 50 per ASTM E84. Lining shall be
secured with pins or mechanical fasteners. Lining that is
secured with adhesive only is not acceptable. Fiberglass
lining shall conform to the erosion test method described
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 13
01/29/16
DESIGN NO. _____
in UL Publication No. 181. The fiberglass lining shall not
support fungi or bacterial growth as per ASTM C1338, ASTM
G21, and ASTM G22. Double walled units may be provided with
rigid fiberglass boards that shall not erode.
C.
1.
19
D.
5
Supply and Exhaust Fans: Forward curved, centrifugal, belt
driven with adjustable motor sheaves, grease-lubricated
ball bearings and motor.
Smoke Control
a.
Per Section MC 513.10 equipment utilized in Smoke
Control systems such as fans and automatic
dampers shall be suitable for their intended use,
suitable for the probable exposure temperatures
and shall be as approved by the Commissioner.
Fans shall be rated and certified by the
manufacturer for the probable temperature rise to
which the components will be exposed. This
temperature rise is _______.
Per
Section
BC 909.4.6 of the 2014 NYC Building Code, all
portions of active smoke control systems shall be
capable of continued operation after detection of
the fire event for not less than 20 minutes or
1.5 times the calculated egress time, whichever
is more.
b.
Per Section BC 909.10.6, Seismic Requirements,
smoke control systems covered by Section BC 909
are life safety systems and are required to
function after an earthquake. Such smoke control
systems
shall
be
seismically
designed
in
accordance with Section BC 1613 and Section
13.2.2 of ASCE 7-10.
The component importance
factor, Ip, shall be taken as 1.5 in accordance
with ASCE 7-10, Section 13.1.3.
The smoke
control system includes all components required
for its operation.
Smoke control systems in
structures
classified
in
Seismic
Design
Categories A or B shall have a component
importance factor, Ip, of 1.0.
Outside Coil Fan: Propeller
permanently lubricated motor.
type,
directly
driven
by
16 E.
Refrigerant Coils: Aluminum-plate fin and seamless copper
tube in steel casing with equalizing-type vertical
distributor. Provide corrosion-protection coating to both
coils.
F.
Compressor: Hermetic reciprocating or scroll compressor (15
HP max - number as required to avoid the need for
refrigeration operator’s license as per NYC Fire Department
Code)
with
integral
vibration
isolators,
internal
overcurrent, overtemperature protection, internal pressure
6
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 14
01/29/16
DESIGN NO. _____
relief and crankcase heater. Provide label in compressor
section indicating rated horsepower and kilowatt equivalent
for each compressor.
G.
Refrigerant System: Compressor(s); Outside coil and fan;
Inside coil and fan; Expansion valves with replaceable
thermostatic elements; Refrigerant dryers; High-pressure
switches; Low-pressure switches; Thermostats or sensors for
coil freeze-up protection during low-ambient temperature
operation or loss of air; Brass service valves installed in
discharge and liquid lines; Hot-gas bypass: factoryinstalled capacity modulating valves; Timed off control:
automatic-reset control shuts compressor off after five
minutes. The lead compressor shall have hot gas bypass
control for additional capacity control in addition to
compressor unloading or staging. Hot gas bypass capacity
control shall use suction pressure controlled discharge
bypass valve and isolation ball valve. The hot gas
discharge bypass valves shall be Siemens M3FB LX Series or
equal. Hot gas discharge bypass valve shall be normally
closed, so that in the event of the failure of the valve,
no hot gas bypass capacity modulation will be available. A
spring shall close the bypass valves if power is switched
off or fails.
The hot gas bypass shall be limited
according Article 6.5.9 of ASHRAE 90.1-10 and Section
C403.4.7 of the 2014 NYCECC.
Per Section MC 1101.1,2
refrigerant circuit access ports located outdoors shall be
fitted with locking-type tamper-resistant caps requiring a
special tool or key to open.
H.
Filters: Per Section MC 605, the filter section shall
include a minimum efficiency MERV 11 filter.
Provide
filter for the outside air intake upstream of the total
enthalpy wheel. Provide filter on the return side upstream
of the total enthalpy wheel, upstream of the recirculation
port.
Filters shall be selected for a velocity not to
exceed 500 fpm. Filters shall be listed and labeled per UL
900-2004.
24
I.
NYCSCA
Heat Exchanger: Aluminized-steel construction for natural
gas-fired burners with the following controls: redundant
dual
gas
valve
with
manual
shutoff,
spark-ignited
intermittent safety pilot(1) ignition, electronic flame
sensor, induced-draft blower and flame rollout switch. Gas
Heater Module shall be in accordance with UL 795 or ANSI
Z21.47 per Section FGC 618.1 of the NYC Fuel Gas Code. All
burner operating and safety controls shall be provided by
the rooftop unit manufacturer.
Provide gas train in
accordance with the guidelines of GE Global Asset
Protection Services (formerly IRI).
Provide internal gas
pressure regulators.
Provide manual reset high gas
pressure switches and automatic reset low gas pressure
switches. The vent piping for any normally open vent valves
(if required by the GE GAP Guidelines) shall be 1” minimum
diameter, standard weight schedule 40 black steel pipe.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 15
01/29/16
21
DESIGN NO. _____
The vent piping for any normally open vent valves shall be
caulked where it penetrates the unit exterior skin and
shall be equipped with a utility approved weatherproof cap
that has an insect resistant screen. Any normally open vent
valve vents shall terminate at least 10’ away from any
outside air intake openings. The furnace exhaust shall
terminate at least 10’ away from any outside air intake
openings.
When the distance from the outside air intake
port to any normally open vent valve terminal or to the
furnace exhaust is less than 10’, the normally open vent
valve vent terminal (if any) and the top of the furnace
exhaust shall be terminated at least 3’ above the top of
the outside air intake port per Section FGC 618.5. If the
entire length of any normally open vent valve line can not
be shipped as an integral part of the roof top unit
assembly, the roof top unit manufacturer shall provide a
supported capped line for subsequent field continuation by
the plumber.
(1) Provide pilot for burners with nominal capacity
exceeding 400 MBH. For burners with nominal capacity equal
to and less than 400 MBH, direct spark ignition may be
provided.
Provide a cool down cycle in the control system that allows
air handler fan to operate for at least two (2) minutes
after gas burner shut-down to dissipate residual heat.
The unit manufacturer factory engineer shall supervise
final adjustments. The unit manufacturer shall also provide
technical support from the burner manufacturer at startup
of the unit for supervision.
Normally open vent valves, if required by the GE GAP
Guidelines, shall be piped separately and directly to the
outside of the enclosure. A UL listed valve proving system
may be substituted for the normally open vent valve (when a
normally open vent valve is otherwise required by the GE
GAP Guidelines). The valve proving system shall be wired
to operate on a call for startup locking out the burner
prior to pilot ignition and/or after burner shutdown if an
internal gas valve leak is detected. Wiring diagrams of the
valve proving system shall be included with the burner
submittal package.
The following valve proving systems may be utilized:
Karl Dungs model# VDK 200a/CM100 pressure module
and control relay
Siemens model# LDU11, LMV, WFM, LFL/LAL/LFE/LME
valve pressure proving systems
Honeywell RM7800L, RM7840L integral valve
pressure proving system
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 16
01/29/16
DESIGN NO. _____
Per Section FGC 403.9.3, joints and connections shall be
approved and of a type approved for natural gas piping
systems. All threaded joints and connections shall be made
tight with suitable lubricant or pipe compound. Pipe joint
compounds and thread seal tape that utilize Teflon (PTFE)
shall be approved for usage on natural gas lines.
Provide gas train shop fabrication drawings when the units
are delivered to the site. All gas train component parts
shall be identified by manufacturer and by part number.
Product data/cuts shall be submitted for all gas train
component parts. Provide gas trains in accordance with the
guidelines of GE Global Asset Protection Services (formerly
IRI). Fabrication drawings shall illustrate (at a minimum)
all regulators, modulating gas valves, safety shutoff
valve(s), any normally open vent valves, high and low gas
pressure switches and manual isolation valves. All details
for any hard piped normally open vent valve venting shall
be shown including pipe diameters, pipe materials and pipe
routing.
The gas train shall be complete and field ready for a
singular connection to a natural gas supply with inlet gas
pressure between 7" and 13.5" maximum W.C.
J.
Economizer: Provide recirculation and outside-air dampers
with neoprene seals. Provide hood for outside air intake
port.
1.
Damper Motor:
Provide outside air intake and
recirculation dampers with fully modulating spring
return with adjustable minimum position.
2.
Control:
Electronic-control system uses relative
outside-air to return air enthalpy to determine
economizer cycle.
3.
Exhaust Damper:
Provide two position power actuated
with bird screen and hood.
Provide air flow monitoring stations for
intake, exhaust air and total supply air.
8
NYCSCA
outside
air
Outside air, recirculation air, and exhaust air dampers
shall have factory mounted fast acting spring return Belimo
or approved equal, damper actuators. Outside air intake
dampers and exhaust dampers shall be normally closed.
Recirculation air damper shall be normally open. Outside
air intake dampers and spill exhaust dampers shall close
when the fans stop. Motorized dampers shall be Class 1 low
leakage type, limiting leakage to 4 CFM/ft2 at a pressure
differential of 1” when tested in accordance with AMCA
500D.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 17
01/29/16
DESIGN NO. _____
K.
Power Connection: Provide for single connection of power to
unit with unit-mounted disconnect switch accessible from
outside unit and control-circuit transformer with built-in
circuit breaker. All unit power wiring shall enter the
unit cabinet at a single location.
L.
The unit control system shall include all required
temperature and pressure sensors, input/output boards,
transformers,
main
microprocessor
and
Human
Machine
Interface (HMI) operator interface and shall perform all
unit control function and safeties. Microprocessor based
control system shall contain at least the following:
1.
Supply fan on/off delay.
2.
Default control to ensure proper operation after power
interruption.
3.
Service relay output.
4.
Unit diagnostics and diagnostic code storage.
5.
Field-adjustable control parameters.
6.
Economizer control.
7.
Gas valve delay between stage firing.
8.
Low-ambient control, allowing operation down to 0°F.
9.
Minimum run time.
10.
7-Day scheduling for occupied/un-occupied
with Night setback mode.
11.
Return-air temperature limit.
12.
Low-refrigerant pressure control.
control,
13.
Human Machine Interface (HMI) digital display of
outside temperature, supply-air temperature, returnair temperature, economizer damper position, CO2
24 indoor-air quality, and control parameters.
NYCSCA
14.
Thermostat
or
sensor:
Programmable,
digital
electronic; with heating/cooling setback and setup
respectively. OEM shall furnish and the Temperature
Controls Contractor (TCC) shall install all field
sensors/controllers.
15.
Touch sensitive keyboard.
16.
Automatic switching between heating and cooling.
17.
Temperature readout.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 18
01/29/16
DESIGN NO. _____
18.
LED indicators.
19.
Hour/day programming.
20.
Manual override capability.
21.
Time and operational mode readout.
22.
Status indicator (heat/cool).
23.
Seventy two (72) hours battery backup.
24.
System switch (on-heat-auto-cool)
(auto-on). See item 28 below.
25.
Fan proving to lock out unit if fan fails.
26.
Dirty-filter Indication.
27.
Loss of charge protection.
and
fan
switch
28.
OEM shall provide a furnace control Hand-Off-Auto
toggle selector switch. In the “Auto” position, the
furnace shall be controlled as defined in Section
15985 Sequence of Operation. In the “Off” position,
the furnace shall be disabled.
In the “Hand”
position, the units’ DDC furnace operating controls
shall be overridden and the furnace started and ramped
up to the full heat output capacity. In all modes, the
furnace operation shall be subject to all safety
devices
including
but
not
limited
to the
manufacturer's high temperature cut-out safety and a
unit airflow proving switch.
Field controls (space thermostats or sensors, outside
temperature thermostats or sensors, etc.) shall be
furnished by OEM and field installed by Temperature
Controls Contractor. DDC Controllers to be mounted in the
rooftop unit (to accomplish the specified sequence of
operation as defined in Section 15985) shall be furnished
and installed by the OEM unit manufacturer. DDC Controllers
shall be factory programmed/configured.
DDC controllers
shall be field commissioned by the OEM or OEM’s authorized
field representative. The OEM or OEM’s authorized field
representative shall provide all system passwords for
system configuration and programming to the Department of
Education on CD media. Two (2) copies of all system control
data shall be provided; one maintained on site by the local
school custodian and an additional copy for off-site
storage by the Department of Education.
For all proprietary
manufacturer’s controllers providing
safety interlocking, compressor staging, condenser fan
operation, gas heat modulation, DX cooling reset and other
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 19
01/29/16
7
M.
9
N.
15 O.
DESIGN NO. _____
internal control functions, a communications gateway shall
be
available
(but
not
provided)
to
interface
the
manufacturer’s control system to a possible future LonWorks
specified BMS/DDC network control system, as required.
Accessories:
1.
Cold-Weather
Kit:
Electric
heater
temperature in gas burner compartment.
maintains
2.
Condensate drain trap.
3.
Hail guards of steel, painted to match casing
4.
Vertical vent extension
Roof
Curb:
Steel
with
corrosion-protection
coating,
gasketing, and factory-installed wood nailer; complying
with
NRCA
standards;
height
as
required
by
the
manufacturer. Curbs shall be compliant with those defined
in Section 15503.
Approved Manufacturers
Carrier Corp.
McQuay International
Trane
YORK International Corporation.
P.
The maximum
follows:
Center Frequency (Hz)
Band Designation
4
radiated
sound
power
levels
shall
be
as
63
125
250
500
1000
2000
4000
8000
1
2
3
4
5
6
7
8
DB
The maximum supply discharge sound power levels shall be as
follows:
Center Frequency (Hz)
Band Designation
4
63
125
250
500
1000
2000
4000
8000
1
2
3
4
5
6
7
8
DB
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 20
01/29/16
DESIGN NO. _____
The maximum return inlet sound power levels shall be as
follows:
Center Frequency (Hz)
Band Designation
4
63
125
250
500
1000
2000
4000
8000
1
2
3
4
5
6
7
8
DB
Q.
Fire Alarm Interface Requirements: The packaged rooftop
unit shall have UL 268A (per Section MC 606.1) manual reset
listed type smoke detectors factory mounted and wired in
the supply and return openings to the unit as required by
the NYC Construction Codes and NYC Electrical Code. Upon
detection of smoke, a signal shall be sent to the building
fire alarm system and the fans shall stop. Installing
Mechanical Contractor shall coordinate this interlock with
the Division 16 Fire Alarm Contractor. Division 16 Fire
Alarm Contractor shall furnish fire alarm system compliant
photoelectric smoke detectors to the Mechanical Contractor
who shall in turn furnish them to the rooftop unit
manufacturer for factory installation. Detectors shall be
rated from -4°F to 158°F and 100 fpm to 4,000 fpm and shall
be furnished with a weatherized housing to prevent
condensation from humidity.
The packaged rooftop unit shall have terminal strips and
interlocking relays factory mounted and wired to interlock
with other components of the building. It is the
responsibility of the installing contractor to advise the
manufacturer of requirements for additional interlocks not
covered in this specification.
Smoke Dampers for Units of 15,000 CFM and Greater Capacity:
NYCSCA
1.
Each air conditioning unit of 15,000 CFM and greater
capacity shall be factory provided with two-position
smoke dampers installed in the unit supply discharge
and in the return air stream immediately upstream of
the return air modulating control damper. Smoke
dampers shall be (NC) normally closed in the event of
a power loss and shall close in response to activation
of the fire alarm control panel. The fans shall not be
permitted to start by the fire alarm control panel
until the fire alarm panel has enabled the fan safety
interlock motor starter circuit.
2.
Smoke dampers shall meet or exceed the following
specifications. Frame shall be a minimum of 12 gauge
galvanized steel formed into a structural hat channel
shape
with
tabbed
corners,
for
reinforcement.
Bearings shall be stainless steel sleeve turning in an
extruded hole in the frame. The blades shall be
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 21
01/29/16
DESIGN NO. _____
aluminum airfoil shaped 0.080” minimum thickness
double skin construction with internal structural
support. Blade edge seals shall be silicone rubber,
mechanically locked into the blade edge, designed to
withstand minimum 250°F (per Section MC 513.5.2.1) and
jamb seal shall be stainless steel flexible metal
compression type. Blade action shall be parallel
blade.
Each smoke damper shall be classified by Underwriters
Laboratory as a leakage rated damper for use in smoke
control systems under the latest version (Rev. 4 or
later) of UL555S and shall be minimum leakage Class II
per Section MC 513.5.2.1.
R.
3.
The smoke dampers and their operator shall be
qualified under UL555S (Rev 4 or later) to a minimum
elevated
temperature
of
250°F
per
Section
MC
513.5.2.1.
Appropriate 120V electric operators shall
be installed by the damper manufacturer at the time of
damper fabrication. Damper and operator shall be
supplied as a single entity which meets all applicable
UL555S qualifications for both dampers and operators.
Damper and operator assembly shall be factory cycled
10 times to assure operation.
All wiring material
required to interconnect the operator with the fire
alarm control panel shall be provided as specified
under Division 16, Electrical. Damper shall be Ruskin
Model SD102 or approved equal.
4.
Blade Position Indicators: Each smoke damper shall be
equipped with Ruskin SP100 switch package or equal.
The switch package shall include two position
indicator switches linked directly to the damper blade
to provide the capability of remotely indicating
damper blade position (through the Fire Alarm System).
5.
Electric operator shall be provided with damper by
damper manufacturer and shall be UL listed as an
assembly. Smoke damper operators shall be slow acting
upon damper closure, with 60 second (adjustable)
closure duration. Damper operators shall be model SQB12.1, as manufactured by Siemens Landis Division, or
approved equal.
Variable Frequency
Manufacturer)
1.
NYCSCA
Drive
(Provided
by
the
Rooftop
Unit
Provide Variable Frequency Drive (VFD) for variable
volume units. Also, provide Variable Frequency Drive
(VFD) for constant volume units to aid in the
balancing process. Packaged rooftop unit fan motors
shall be provided with solid state variable frequency
drives to convert three phase, 60 hertz power to
adjustable frequency and voltage three phase power for
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 22
01/29/16
DESIGN NO. _____
step-less motor speed control from 0% to 100% of base
speed. Input voltage shall be 460-3-60 or 208-3-60 as
available. The VFD shall be capable of operating
within the range of 10% over to 10% under the rated
input voltage. The VFD shall be designed for use on
variable torque loads and shall be capable of
providing sufficient torque to start motor from rest
with initial influx of power. The VFD operation shall
be fully factory tested by the drive manufacturer
prior to shipment and installation. The VFD controller
shall have the following features: isolated power for
control circuits, automatic type reset faults for
over-current, under-voltage, over-voltage, phase loss
or over-temperature, fault counter reset, adjustable
current limiting circuitry, independent acceleration
and deceleration time adjustment, 4-20 mA control
signal
interface,
0-10
Vdc
output
signal,
and
automatic frequency adjustment. VFD shall be provided
with digital read output meter indicating percent
speed
and
load,
local/remote
selector
switch,
power/on,
diagnostic, and fault trip indicating
lights, Hand/Off/Auto selector switch, manual by-pass
switch, by-pass starter, and manual speed control
adjustment. The complete drive shall be tested to ANSI
C37.90.1 and UL Standard 508 and be ETL or UL listed.
Power line noise distortion shall be limited to
voltage distortion factor and line notch depth defined
in IEEE Standard 519-1981. Total voltage distortion
shall not exceed 5%. VFD shall be provided with two
normally open and two normally closed dry contacts
rated at 120 volts, 10 amps, 60 Hz for remote
indication of the following: controller shutdown with
automatic restart, system shutdown with automatic
restart, and system running condition. Controller
shall include a door interlock fused safety disconnect
or circuit breaker that will disconnect all input
power.
The VFD supply and exhaust fan package shall be
selected with inverted rated duty motors and motor
winding insulation complying with IEC Part 34.17.
2.
Variable Frequency Drive (VFD) LonWorks Card
The VFD drive for variable speed fan shall be able to
be provided with a LonWorks interface card to provide
the LonTalk open protocol (ANSI approved standard
EIA/CEA-709.1-A-1999) for control communications with
“plug & play” capabilities for a possible future
LonWorks BMS/DDC network. The LonWorks interface card
need not be provided as part of the CIP project.
Hand/Off/Auto functionality shall be built into the
VFD digital operator keypad for operation from remote
NYCSCA
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 23
01/29/16
DESIGN NO. _____
(Auto) or local (Hand) signals. A copy function shall
be provided for set-up parameters when programming
multiple drives. Factory “default” parameters shall be
user selectable for typical fan applications and shall
be able to be field refined for custom applications.
The VFD shall be provided with a PI controller that
shall maintain setpoint for control of the fans based
on pressure, flow or temperature regulation.
3.
Acceptable Manufacturers
Yaskawa
Asea Brown Boveri (ABB)
Siemens
Danfoss
Vacon
GE Fuji
Square D
Or approved equal
24
S. Total Enthalpy Wheel Heat Exchanger
1.
NYCSCA
Wheel Matrix: Rotor shall be constructed of rotating
honeycomb matrix consisting of a highly selective
desiccant
permanently
bonded
to
aluminum
(with
prototype performance tested in accordance with ASHRAE
Standard 84-91 and ARI Standards 1060-01).
Moisture
as well as sensible energy shall be transferred
between the two airstreams.
The desiccant material
shall be a molecular sieve with pore diameter of 3A to
minimize
the
carryover
of
undesirable
gases.
Corrugated media shall provide individual flutes to
channel
the
airflow
and
thus
minimize
cross
contamination and ensure rated performance under all
differential pressure conditions.
The desiccant
coating shall provide corrosion resistance against
attack from laboratory chemicals, etc. and protection
in coastal and marine environments. Wheel rotor media
that is 72” diameter or smaller can be either
segmented or single piece construction.
Wheel rotor
media larger than 72” diameter shall be segmented. If
segmented, each segment shall consist of media
supported by spokes and tensioned in place by the rim.
Wheels shall have a flatness of + 1/32”. No adhesives
or silicone shall be necessary to secure the media in
place in order to allow for future replacement in the
event of damage to a segment. The structural frame,
casing and rotor shall be designed and manufactured so
as to allow a maximum rotor deflection of 1/32”, as
measured at the outer radius, during maximum rated
airflow conditions.
The media shall have a flame
spread of 0 and a smoke developed of 5 or less when
rated in accordance with ASTM E84-07.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 24
01/29/16
DESIGN NO. _____
2.
Wheel Casing:
The wheel frames shall consist of
evenly spaced extruded aluminum or corrosion resistant
polyurethane coated galvanized steel or epoxy painted
heavy duty structural steel spokes, extruded aluminum
or corrosion resistant polyurethane coated galvanized
steel or epoxy painted heavy duty structural steel
outer band, and a rigid center hub.
The wheel
construction shall allow for wheel alignment. The
wheel seals shall be easily adjustable. Seals shall
be included to separate fresh air from exhaust air
across entire surface of air entering side, air
leaving side and outer band (all four planes).
Additionally, the entire circumference of the rotor
shall include seal to minimize air bypass. The case
construction shall be aluminum or corrosion resistant
polyurethane coated galvanized steel or epoxy painted
heavy duty structural steel.
Bearings shall be
outboard-flanged ball bearing with concentric locking
collars or tapered roller bearings with double
setscrew locking collars. Bearings shall be provided
with
easily
accessible
grease
fittings
for
maintenance. Bearings shall provide a minimum L-10
life of 100,000 hours of operation.
Sealed bearings
are also acceptable.
Drive system shall consist of a belt driven heavy-duty
inverter rated AC motor. The drive system shall have
a minimum life expectancy of 50,000 hours. The speed
control system shall be a variable frequency drive
(VFD) capable of operating the rotor from nominally
1/4 RPM to 20 RPM or to the required speed for the
type of media used. The OEM controller for the drive
system shall be integrated with the temperature
control system to provide the required dry and wet
bulb temperatures.
The OEM temperature controller
shall monitor entering and leaving temperatures for
the exhaust and supply air.
Adjustable set points
shall be provided for wheel frost control.
3.
Energy wheel shall be arranged within the heat
recovery system so as to minimize differential
pressure while keeping the exhaust side negative in
comparison to fresh air side.
The wheel shall have
the thickness required to achieve at least a nominal
75% effectivity and shall have a pressure drop not
exceeding that as indicated on the Drawings.
4.
Wheel Accessories:
a.
NYCSCA
OEM
controls
and
factory
set
(but
field
adjustable) purge system shall be provided to
remove exhaust air from the depth of the wheel as
it revolves from exhaust to outside air.
The
purge system shall be provided to eliminate
transfer of exhaust air into the supply air.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 25
01/29/16
DESIGN NO. _____
5.
b.
Provide rotation detector, wheel RPM readout and
wheel stoppage alarm contacts.
c.
Provide variable speed drive. The wheel will stop
rotation in the economizer mode and modulate in
the frost control mode. Wheel shall run full
speed in the occupied cooling mode and occupied
heating mode. Wheel shall be deactivated while
the unit is running in the morning warm up, preoccupied pull down, pre-occupied purge and
unoccupied modes when the wheel is bypassed by
the recirculation dampers.
Maintenance:
a.
6.
The entire rotor and wheel assembly shall require
only
limited
maintenance
and
shall
be
manufactured not to require more than biannual
greasing of the main bearings and inspection of
the drive system.
Manufacturers
a.
Subject to compliance with requirements, provide
enthalpy wheel heat exchangers from one of the
following manufacturers (or equal). “Equal”
indicates
that
all
capacities,
dimensions,
weights, materials, and performance criteria are
equal or better than that described herein.
Thermotech Enterprises TC-Series Thermowheel
Des Champs Thermo-Wheel
AIRotor
Innergy Tech ERW3000
PART 3 - EXECUTION
3.01
INSTALLATION
A.
Install packaged heating and cooling units in accordance
with manufacturer's installation instructions. Install
units plumb and level, firmly anchored in locations
indicated,
and
maintain
manufacturer's
recommended
clearances.
1.
9
NYCSCA
The roof curb shall be designed to mate with the unit
and provide support and a watertight installation when
installed properly. The roof curb design shall allow
field-fabricated rectangular supply/return ductwork to
be connected directly to the curb. Curb design shall
comply with NRCA requirements. Curb shall be shipped
knocked down for field assembly and shall include wood
nailer strips.
COMMERCIAL PACKAGED ROOFTOP HEATING AND
COOLING UNITS 15855 - 26
01/29/16
DESIGN NO. _____
B.
Electrical Wiring: The Division 16 Electrical Contractor
shall install electrical devices furnished by manufacturer
but not specified to be factory-mounted. Furnish copy of
manufacturer's wiring diagram submittal to Electrical.
1.
Verify that electrical wiring installation is in
accordance
with
manufacturer's
submittal
and
installation requirements of Division-16 Sections. Do
not proceed with equipment start-up until wiring
installation is acceptable.
C.
Ductwork: Refer to Section 15891: Metal Ductwork. Connect
supply and return ducts to unit with flexible duct
connections. Provide transitions to exactly match unit
duct connection size.
D.
Gas Piping: Connect gas supply piping to unit as indicated
on the drawings with unions and shutoff valves.
E.
Drain Piping: Connect primary unit drain to splash block.
Provide trap at primary drain pan; construct primary pan
at least 1" deeper than fan pressure in inches of water.
17 F.
For curb mounted units, per Section MC 307.2.3, Mechanical
Contractor or manufacturer shall provide a [primary pan
overflow drain line] [auxiliary drain pan and associated
drain line] as shown on the Drawings for each DX evaporator
coil (when the unit is curb mounted, not dunnage mounted)
to avoid damage to any building component as a result of
overflow from the primary equipment drain pan or stoppage
in the primary condensate drain piping. One of the
following methods shall be used:
18
17
17
NYCSCA
1.
Mechanical Contractor shall coordinate with sheet
metal subcontractor to provide (or manufacturer shall
provide) an auxiliary drain pan as shown on the
Drawings with a separate drain under the coils on
which condensation will occur. The auxiliary pan drain
shall discharge to a conspicuous point of disposal (as
shown on the Drawings) to alert occupants in the event
of a stoppage of the primary drain. The auxiliary pan
shall have a minimum depth of 1.5”, shall not be less
than 3” larger than the unit or the coil dimensions in
width and length and shall be constructed of
corrosion-resistant material. Auxiliary metallic pans
shall have a minimum thickness of 0.0236” (No. 24
gage) for galvanized sheet metal pans, .0179” (No. 26
gage) for stainless steel pans, or 0.0320” (No. 20
gage) for aluminum pans. Nonmetallic pans shall have a
minimum thickness of not less than 0.0625”
or
1.
Mechanical Contractor (or manufacturer) shall provide
a separate overflow drain line connected to the
primary drain pan provided with the equipment. Such
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overflow drain shall discharge to a conspicuous point
of disposal (as shown on the Drawings) to alert
occupants in the event of a stoppage of the primary
drain. The overflow drain line shall connect to the
primary drain pan at a higher level than the primary
drain connection or
2.
Alternate
Acceptable
Installation:
Mechanical
Contractor
shall
coordinate
with
sheet
metal
subcontractor to provide (or manufacturer shall
provide) an auxiliary drain pan without a separate
drain line under the coils on which condensate will
occur. Mechanical Contractor shall coordinate with the
Temperature Controls subcontractor to provide (or
manufacturer shall provide) a hard-wired water-level
detection device for the auxiliary pan that will shut
off the equipment served prior to overflow of the
auxiliary pan. The auxiliary pan shall have a minimum
depth of 1.5”, shall not be less than 3” larger than
the unit or the coil dimensions in width and length
and shall be constructed of corrosion-resistant
material. Auxiliary metallic pans shall have a minimum
thickness of 0.0236” (No. 24 gage) for galvanized
sheet metal pans, .0179” (No. 26 gage) for stainless
steel pans, or 0.0320” (No. 20 gage) for aluminum
pans. Nonmetallic pans shall have a minimum thickness
of not less than 0.0625”
or
17 2.
Alternate
Acceptable
Installation
per
Section
MC 307.2.3.1 water-level monitoring devices: On downflow units and all other coils that do not have a
secondary drain or provisions to install a secondary
or auxiliary drain pan, a water-level monitoring
device shall be installed by the Mechanical Contractor
or Temperature Controls Contractor inside the primary
drain pan. This device shall shut off the equipment
served in the event that the primary drain becomes
restricted. Devices installed in the drain line shall
not be permitted.
17
3.02
SIGNS, NAMEPLATES
INSTRUCTIONS
A.
NYCSCA
AND
OPERATION
AND
EMERGENCY
SHUTDOWN
Signs, nameplates, and operation and emergency shutdown
instructions for refrigeration systems shall comply with
the following (per Section MC 1101.11):
1.
Sections 9.15, 11.2.1, 11.2.2 and 11.7 of ASHRAE 15-10
as identified below.
2.
Each refrigeration unit or system shall be provided
with a nameplate indicating the “rated” horsepower of
the prime mover or compressor and the equivalent of
such horsepower in kilowatts.
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3.
Section MC 1105.11 which states that emergency signs
shall comply with the following:
a.
B.
Refrigeration
units
or
systems
having
a
refrigerant circuit containing more than 220
pounds of Group A1 or 30 pounds of any other
group refrigerant shall be provided with approved
emergency signs, charts, and labels in accordance
with NFPA 704.
Per ASHRAE 15-10, Section 9.15:
Nameplate: Each unit system and each separate condensing
unit, compressor, or compressor unit sold for field
assembly in a refrigerating system shall carry a nameplate
marked with the manufacturer’s name, nationally registered
trademark or trade name, identification number, the design
pressures, and the refrigerant for which it is designed by
the refrigerant number (R number as shown in Table 1 or
Table 2 of ASHRAE 34-10).
C.
Per ASHRAE 15-10, Section 11.2.1:
Installation Identification: Each refrigerating system
erected on the premises shall be provided with a legible
permanent sign, securely attached and easily accessible,
indicating (a) the name and address of the installer, (b)
the refrigerant number and amount of refrigerant, (c) the
lubricant identity and amount, and (d) the field test
pressure applied.
D.
Per ASHRAE 15-10, Section 11.2.2:
Controls and Piping Identification: Systems containing more
than 110 lb (50 kg) of refrigerant shall be provided with
durable signs having letters not less than 0.5 in. in
height designating: (a) valves or switches for controlling
the
refrigerant
flow,
the
ventilation,
and
the
refrigeration
compressor(s),
and
(b)
the
kind
of
refrigerant or secondary coolant contained in exposed
piping outside the machinery room. Valves or piping
adjacent to valves shall be identified in accordance with
ANSI A13.1, Scheme for Identification of Piping Systems.
E.
Per ASHRAE 15-10, Section 11.7:
Responsibility for Operation and Emergency Shutdown: For a
refrigerating system containing more than 55 lb (25 kg) of
refrigerant, provide a schematic drawing or panel giving
directions for the operation of the system at a location
that is convenient to the operators of the equipment.
Emergency shutdown procedures, including precautions to be
observed in case of a breakdown or leak, shall be displayed
on a conspicuous card located as near as possible to the
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refrigerant compressor. These precautions shall address (a)
instructions for shutting down the system in case of
emergency; (b) the name, address, and day and night
telephone numbers for obtaining service; and (c) the names,
addresses, and telephone numbers of all corporate, local,
state, and federal agencies to be contacted as required in
the event of a reportable incident.
3.03
FIELD QUALITY CONTROL
A.
3.04
3.05
Start-up packaged heating and cooling units, in accordance
with manufacturer's start-up instructions and in the
presence of a manufacturer's representative. Test controls
and demonstrate compliance with requirements.
Replace
damaged
or
malfunctioning
controls
and
equipment.
Contractor shall submit written affidavit indicating that
the equipment is operating as designed.
The Temperature
Controls Contractor shall test the digital DDC system and
demonstrate compliance with the requirements of the
Specifications to the satisfaction of the Authority’s
representative. The Contractor shall perform necessary
Interdisciplinary Tests and Functional Performance Tests
according to the manufacturer’s procedures.
TRAINING
A.
Provide services of manufacturer's technical representative
for two days to instruct the Department of Education
Custodial Staff and DOE Maintenance Representative in the
operation and maintenance of the packaged heating and
cooling units.
B.
Schedule training with the Authority. Provide at least 2days notice of training date to the Custodian and DOE
Maintenance Representative.
C.
The documentation for each controller shall include an
accurate graphic flow diagram of the software program for
future owner reference.
INTERDISCIPLINARY TESTS AND FUNCTIONAL PERFORMANCE TESTS
A.
Interdisciplinary Pre-Start-Up and Start-Up Tests:
The Contractor shall conduct interdisciplinary pre-start up
and start up tests as per the manufacturer’s start up
procedures. Contractor shall submit signed start up
affidavit signed by the factory authorized service
representative indicating that all of the manufacturer’s
pre-start up and start up procedures have been successfully
completed.
NYCSCA
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B.
DESIGN NO. _____
Functional Performance Tests
Contractor shall also submit signed functional performance
testing affidavit signed by the factory authorized service
representative indicating that all of the manufacturer’s
functional
performance
tests
have
been
successfully
completed.
3.06
COMMISSIONING OF ROOFTOP HVAC UNITS
A.
14
HVAC Contractor shall comply with the Commissioning
Requirements of Contract Specification Section S01660 for
rooftop HVAC units.
END OF SECTION
* * *
BB:JV:RE:AK
01/29/16
Notes to Specifier (Delete from Specification)
1.
Edit as required. Section 15503 is to be utilized if the project
involves construction of a New Building or Addition to building
in Seismic Design Category C or D. Section 15503 is also to be
utilized if project involves retrofit work in Existing Buildings
in Seismic Design Category C or D constructed after LL17/1995
went into effect. Use Section 15504, Vibration Isolation,
(without seismic restraints) for retrofit work on Existing
Buildings constructed prior to the effective date of LL17/1995
and for any buildings in Seismic Design Category B.
2.
Note deleted.
3.
Architect/Engineer of Record shall engage the services of an
acoustical consultant during the design of the project.
The
report findings of the acoustical consultant shall be submitted
to the Authority.
Acoustical consultant shall address the
possible need for the following (including but not limited to):

The need for sound traps and/or acoustical lining upstream
and downstream of the air conditioning units

Mounting the rooftop equipment on dunnage in lieu of curb
mounting (especially for NC 25 Auditoriums)

Locating the units over non-critical spaces where possible
(e.g. corridors, storage spaces)

The need to run commercial rooftop unit ductwork externally
on the roof
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
The need to provide acoustic noise barrier walls around the
rooftop units in special circumstances

The need to provide floating slabs

Internal isolation of all rotating components

Insulation of void spaces within roof curbs (where curbs
are used in lieu of dunnage)

Individual acoustical jackets for each compressor
4.
The Architect/Engineer of Record (through his/her Acoustical
sub-consultant) shall provide the maximum acceptable radiated,
supply discharge, and return inlet sound power levels of each of
the rooftop units based on the particular construction (nature
of roof deck, type of suspended ceiling if any, type of rooftop
unit mounting (roof curb or dunnage), proximity to adjacent
buildings, routing of ductwork, possible presence of acoustical
duct lining, thickness of possible acoustical duct lining, sound
trap attenuation capabilities, etc.
5.
Coils that are exposed to a marine environment (i.e. school is
located near the shore) shall utilize copper fins in lieu of
aluminum fins. Edit the section as required.
6.
Edit as required. Architect/Engineer of Record shall determine
if the factory provided isolators sufficiently attenuate the
vibration considering the flexibility and nature of the
structural roof (beam frame spacing, deck construction, etc.).
If it is determined that the factory provided isolators are
insufficient, equipment shall be provided without factory
vibration isolators (or shipping hold down bolts shall remain
secured
thus
defeating
the
factory
isolators).
Architect/Engineer of Record shall define the required field
erected vibration isolators (stiffness, static deflection, etc.)
and reflect the field erected isolators on the Schedule of
Equipment on the Drawings. Contractor’s registered professional
engineer shall be responsible for the seismic restraints of all
equipment. Contractor’s registered professional engineer may
elect to provide the equivalent vibration isolators in combined
vibration
isolator/seismic
restraint
supports.
Architect/Engineer of Record’s vibration analysis shall be
submitted to their acoustical sub-consultant for review.
Reference Section 15503 and Section 15504.
7.
Edit the custom rooftop unit points list to reflect the points
list for the commercial rooftop units. Also edit the custom
rooftop unit sequence of operation to reflect the commercial
rooftop unit sequence of operation in Section 15985. Non-native
LonWorks controllers may be provided on CIP projects if there
exists an available gateway to Lon. The gateway is not to be
provided at the time of the construction of the CIP project. The
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availability of a gateway is required to be determined for a
connection to a possible future LonWorks BMS/DDC network.
8.
Post fire smoke purge systems need not be on emergency power.
Smoke control systems that must function for a minimum of 20
minute duration or 1.5 times the calculated egress time,
whichever is more per Section BC 909.4.6, during the fire are to
be on standby power per Sections BC 909.11, BC 2702.2.2 and
MC 513.11.
9.
Refer to Building Envelope Design Requirement 4.4 for cases when
dunnage, curbs, platforms and ladders are to be provided. Edit
as required.
10.
All rooftop units mounted on a fluid applied protective membrane
roofing system shall be provided with adjacent pavers to allow
for service access.
Depending on location within the roof,
provide double or triple layer of pavers to ensure all servicing
shall be able to be performed above the maximum possible water
line when a roof detention/fluid applied protective membrane
roofing system is used. Provide protection pads adjacent to the
rooftop units to grant access when the rooftop units are mounted
on a built-up roofing system. HVAC Engineer of Record shall
coordinate with all other required related design disciplines.
All details shall be reflected on the bid drawings.
11.
Not used.
12.
Edit as required.
13.
MERV 13 filters, reheat coils for ASHRAE Standard 55 humidity
control are required for projects subject to LL86/05. Standard
commercial units may only be used for non-LL86/05 projects. For
LL86/05 projects, units exceeding 6,000 cfm must be full custom
units as described in Sections 15853 and 15854.
For LL86/05
projects, units less than 6,000 cfm must still provide all of
the above features but other full custom characteristics may be
omitted resulting in “semi-custom” units. “Semi-custom” units
may require external sound control wall with acoustic louvers
due to the reduced integral sound attenuation package.
Belt
driven fans may only be available in lieu of direct driven fans.
The integral “semi-custom” unit vibration isolators may be
inadequate thus requiring external isolators.
4” MERV 13
cartridge filters may have to be used in lieu of 12” MERV 13
cartridge filters. 18 gauge exterior galvanized panels may have
to be used in lieu of 16 gauge exterior panels. 20 gauge
galvanized steel interior panels may have to be used in lieu of
16 gauge interior panels. Custom supply/return plenum sections
may have to be reduced to smaller “semi-custom” plenum sections.
Condenser section fans may not be available with variable speed
drives. Compressors may not be available with acoustic jackets.
Walk-in vestibules for maintenance may have to be eliminated.
LL86/05 projects with units less than 6,000 cfm may be “semicustom” units as provided by Coolbreeze or equivalent.
For
leased building projects subject to LL86/05, “semi-custom” units
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DESIGN NO. _____
may be utilized for all sizes subject to approval by the
Authority. Edit Sections 15853 and 15854 as required to reflect
the “semi-custom” unit characteristics.
14.
This paragraph is intended for projects that must comply with the
NYC Green Schools Rating System (generally all capacity projects)
and the following CIP projects:
a.
b.
HVAC
upgrades
(boiler
replacements/
DDC-only systems/ AC upgrades, etc)
Temperature Control systems
BMS/DDC
Systems
15.
Any of the approved manufacturers listed in the Custom Rooftop
Unit Sections, (15853 and 15854) can be considered as approved
manufacturers for commercial unit applications. Verify the usage
of such custom units is within the project’s budget.
16.
If the air velocity exceeds 500 fpm when delivering the required
volumetric flow and the unit dimensions can not be enlarged due
to physical space limitations, provide mist eliminators in order
to limit condensate carryover (Mistop or approved equal),
nominally 1” thick, stainless steel with 0.1” wc pressure drop
at 500 fpm. Provide mounting clips and frames to secure and
support the mist eliminators. Edit section as required. Designer
is to verify that fans have adequate static pressure capability
to deliver the required volumetric flow considering the
additional pressure losses associated with the mist eliminators.
Designer is to show any required mist eliminators on the
Drawings.
17.
Edit as required. For curb mounted units (not dunnage mounted
units), designer shall show drain line for auxiliary pan (and
shall show auxiliary pan, minimum depth 1.5”, not less than 3”
larger than the unit or coil dimensions per Section MC 307.2.3)
or overflow drain line for primary pan.
Show routing and
diameter of all drain lines. An option is to use a sight glass
in the drain line from the auxiliary pan or primary pan overflow
drain line to achieve the “conspicuous point of disposal” effect
referred to in Section MC 307.2.3. Designer shall indicate on
the Drawings that there are alternate design options of
providing an auxiliary drain pan (without an additional drain
line) with a Temperature Controls Contractor (TCC) provided (or
manufacturer provided) water level detection device or providing
a primary drain pan with a Temperature Controls Contractor (TCC)
provided (or manufacturer provided) water level detection device
which will shut down the unit upon an overfill condition. Show
all details on the Drawings and identify the acceptable water
level detection device alternate designs. Designer to select
appropriate
paragraph
1
with
corresponding
appropriate
paragraph 2.
18.
Edit as required.
Delete for dunnage mounted units. Specify
which units are curb mounted where this Article applies.
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19.
Delete article if smoke control systems are not used on the
project. Components of smoke control fans shall be rated and
certified by the manufacturer for the probable temperature rise
to which the components will be exposed. This temperature rise
shall be computed by the designer in accordance with Section MC
513.10. Edit the Section by defining the probable temperature
rise and insert into Article. Verify that when the submittals
are received, the components are suitable for the probable
exposure temperature. Fans shall be selected for stable
performance based on normal temperature and, where applicable,
elevated temperature. Calculations and manufacturer's fan curves
shall be part of the documentation procedures.
20.
Note deleted.
21.
For any normally open vent valve line, show field continuation
from RTU manufacturer’s capped line to terminal of any normally
open vent valve line on the Plumbing Drawings if the RTU
manufacturer can not ship the normally open vent valve line as
an integral part of the RTU assembly.
22.
Delete submittal for CIP projects and if smoke control systems
are not used on a capacity project.
23.
For PA spaces, per Section 6.4.3.10 of ASHRAE 90.1-2010 and
Section C403.3.3 of the 2014 NYCECC, single zone VAV systems
(SZVAV) are required when the cooling capacity at AHRI
conditions is greater than or equal to 110,000 BTUH. If single
zone VAV systems are required instead of constant volume
systems, edit Section as required.
See control details and
associated points list (1598512f).
24.
Provide Energy Recovery Wheel (ERW) per
90.1-2010 and Section C403.2.6 of the
Controlled Ventilation (DCV) per Section
2010 and Section C403.2.5.1 of the 2014
required.
25.
Delete for CIP projects unless a full
installed. Discuss with the Authority.
Section 6.5.6 of ASHRAE
2014 NYCECC or Demand
6.4.3.9 of ASHRAE 90.1NYCECC. Edit section as
BMS
system
is
being
* * *
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LIST OF SUBMITTALS
SUBMITTAL
DATE SUBMITTED
DATE APPROVED
Product Data:
______________
1. Manufacturers Product Data
2. Fan Curves
3. Compressor Efficiency Data
4. Gas Fired Unit Efficiency Data
5. Installation Instructions
6. Start-up Instructions
7. Radiated, supply discharge
and return inlet computer
generated sound power levels
____________
Shop Drawings:
1. Mounting Details
2. Wiring Diagrams
3. Piping Diagrams
4. Gas Train Shop
Fabrication Drawings
______________
____________
Test Reports:
1. Manufacturers’ Factory
Test Results:
_____________
____________
______________
____________
Maintenance Material:
1. Spare Filters:
2. Spare Belts (Omit for
direct drives)
____________
__________
Maintenance Data:
1. Maintenance Manual
______________
____________
Preventative Maintenance
Plan and Schedule
______________
____________
Warranties
____________
__________
Certificates:
1. Contractor’s Start-Up and
Demonstration Affidavit
2.
Seismic certificate
22
of operability
* * *
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