HVAC SPECIFICATIONS
Page 1
HVAC SPECIFICATIONS
GENERAL
.01
Furnish and install a Heating, Ventilating and Air Conditioning system in accordance with
these plans and State of Wisconsin and local codes, in acceptable working order, using
new equipment except where noted.
.02
Scope of HVAC work includes all equipment, duct work, piping, controls, and balancing;
equipment curbs, supports, and pads, and roof penetrations. Owner will provide
electrical work and precast wall penetration, and roof repairs..
.03
Secure and pay for all permits applicable to the work, and pay all State and Federal
taxes imposed.
.04
Submit 5 copies of certified drawings for all equipment to Engineer for approval. At
completion of project, submit (2) bound sets of submittals along with operating and
maintenance instructions for all equipment to Owner. Guarantee all equipment and
workmanship 1 year from date of acceptance.
.05
Perform all cutting and patching necessary for installation of HVAC work and to restore
existing surfaces to their previous condition. Cutting and patching necessary to expose
defective work for repair will be done at HVAC installer’s expense.
.06
If a manufacturer other than that whose equipment is shown on the plans is used,
installer is responsible for redesign of the structure, foundations, utilities, piping, wiring or
of any other part of the Work. The cost of all such redesign, drawings, detailing and
accompanying additional costs of any item of the Work shall be paid for by the installer
and such redesign shall be subject to the approval of the Engineer
.07
Plans and specifications are intended to conform to governing codes and standards. If
non-conformities are discovered, bring same to attention of the Engineer for clarification
before submitting a bid or proceeding with the work. Code compliance of work installed
without such consultation will be the installer’s responsibility.
INSULATION
.01
Ducts: Apply external insulation as noted below. Fasten with weld pins. Secure seams
with foil face tape approved by insulation manufacturer.
a. Outside air ducts: 1-1/2” 3.0 pcf rigid insulating board with FSK facing (min. R-value
6.5).
.02
All insulation installed inside building shall have 25 or less flame spread, 50 or less
smoke developed rating.
HVAC Modifications to Metal Shop for Omro High School
HVAC SPECIFICATIONS
Page 2
NATURAL GAS PIPING
.01
Piping installation shall meet requirements of International Fuel Gas Code and local gas
utility.
.02
Provide piping from existing gas main to make-up air unit. Install dirt legs and shutoff
valves at all equipment. Final connections to heating equipment by HVAC installer.
.03
Pipe and fittings (for up to 5 PSIG distribution): Schedule 40 carbon steel, 150 lb.
malleable iron threaded fittings. Type L copper with brazed fittings is also acceptable for
sizes 2" and under.
HEATING, VENTILATING, AIR CONDITIONING EQUIPMENT
.01
Furnish and install HVAC equipment as noted or scheduled on plans. Be responsible for
receiving and storage. Provide structural steel brackets, supports, and stands as
required, and concrete pads as noted on plans.
a. Acceptable manufacturers - Fans: Loren Cook, Greenheck, New York Blower, Penn
b. Acceptable manufacturers – Make-up Air units: Absolut Aire, Applied Air Systems
.02
Label all equipment and piping using stencils, snap-on labels, or adhesive-backed
labels.
DUCTWORK
.01
Metal Ductwork, rectangular: G60 galvanized steel. Transverse joints - standing "S" and
drive slips to 18", flange system over 18". Seal all ducts to SMACNA Class “B”
(transverse joints and longitudinal seams sealed) or better, using mastic type duct sealer
equal to Foster 32-14 or 32-17. Cross-break or bead all ducts over 18".
.02
Sizes on plans are inside dimensions.
.03
Fabricate duct using gauges and reinforcement per SMACNA tables for 2" static
pressure or use the following (based on 2" pressure class):
DUCT DIM. GAUGE
0-10"
26
11-12"
26
13-18"
26
19-22"
24
23-26"
24
27-30”
24
31-36"
22
37-42"
22
43-48"
22
.04
CLASS & TYPE
JOINT REINFORCEMENT
SPACING
None
A
Flat drive slip
5'
A
Flat drive slip
5'
B
1" x 24 ga. Flange
8'
C
1" x 24 ga. Flange
8'
C
1" x 24 ga. Flange
8'
D
1" x 24 ga. Flange
8'
E
1-3/8" x 24 ga. Flange
8'
F
1-3/8" x 20 ga. Flange
5'
Metal ductwork, round: Spiral lockseam or welded longitudinal seam construction. Use
smooth formed elbows through 8" dia., welded segmented elbows over 8" and other
fittings. Joints: couplings with sheet metal screws; seal after installation with approved
HVAC Modifications to Metal Shop for Omro High School
HVAC SPECIFICATIONS
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duct sealer. Provide gauges per SMACNA recommendations for 2" positive pressure.
.05
Provide manual dampers at major duct branches, all branch takeoffs and (in addition to
automatic damper) outside air intakes.
.06
Follow procedures noted in SMACNA Thermoplastic Duct (PVC) Construction manual
for installation of PVC duct.
CONTROLS AND CONTROL SEQUENCES
.01 All equipment will be manually energized.
.02
Provide a variable mixture control system (80/20) for the makeup unit, controlled by a
building static pressure sensor, to maintain a slightly positive building pressure as
exhaust fans cycle on and off.
.03
Provide a digital discharge temperature control system for the make-up air unit, with
sensor in the discharge plenum
TESTING & BALANCING
.01
General: Start up, test and balance entire system. Testing personnel shall be NEBB
qualified or under supervision of AABC certified agency. Advise Engineer of problems
encountered during balancing procedure before continuing.
.02
Air side balancing: Adjust central fan equipment to from +5 to +10% of specified air
flows from pitot tube traverses of main supply, return, and exhaust ducts, then adjust all
air outlets to from 0 to -10% of values shown using a calibrated flow hood. For VAV
systems, set VAV maximum and minimum flows to scheduled values using VAV box
airflow sensor.
.03
Complete AABC or NEBB test report forms at conclusion of activities and include in
operation and maintenance manual.
HVAC Modifications to Metal Shop for Omro High School