Bryant 549B - Manual (Page 158)

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GUIDE SPECIFICATIONS — 542J150,180
PACKAGED ROOFTOP AIR-TO-AIR HEAT PUMP —
CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 13 AND 15 TONS, NOMINAL (COOLING)
136,000 TO 172,000 BTUH, NOMINAL
(HEATING)
19 TO 50 kW NOMINAL (ELECTRIC
HEATING)
BRYANT MODEL NUMBER:
542J
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, electrically controlled air-to-air
heat pump unit utilizing reciprocating, semi-hermetic
compressor(s) for cooling duty and electric resistance coils
for heating duty. Unit shall discharge supply air vertically or
horizontally (with horizontal supply/return adapter assem-
bly or roof curb) as shown on contract drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/
240 or 360 and 270. Designed in accordance with UL
Standard 1995. Units shall be Energy Star qualified.
B. Unit shall be designed to conform to ASHRAE 15, latest
revision.
C. Unit shall be UL-tested and certified in accordance with
ANSI Z21.47 Standards and UL-listed and certified under
Canadian standards as a total package for safety
requirements.
D. Roof curb shall be designed to conform to NRCA
Standards.
E. Insulation and adhesive shall meet NFPA 90A require-
ments for flame spread and smoke generation.
F. Unit casing shall be capable of withstanding 500-hour salt
spray exposure per ASTM B117 (scribed specimen).
G. Unit shall be designed in accordance with
ISO 9001:2000, and shall be manufactured in a facility
registered to ISO 9001:2000.
H. Each unit shall be subjected to a completely automated
run testing on the assembly line. Units contain a factory-
supplied printout indicating tested pressures, amperages,
data, and inspectors; providing certification of the unit sta-
tus at the time of manufacture.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT (STANDARD)
A. General:
Factory assembled, single-piece heat pump unit. Con-
tained within the unit enclosure shall be all factory wiring,
piping, controls, refrigerant charge (R-22), and special
features required prior to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel,
and shall be bonderized and coated with a pre-
painted baked enamel finish on all externally
exposed surfaces.
2. Indoor fan compartment interior cabinet surfaces
shall be insulated with a minimum 1 /
2
-in. thick, 1 lb.
density, flexible fiberglass insulation, neoprene
coated on the air side. Aluminum foil-faced fiberglass
insulation shall be used in the gas heat
compartment.
3. Cabinet panels shall be easily removable for
servicing.
4. Holes shall be provided in the base rails for rigging
shackles to facilitate maneuvering and overhead
rigging.
5. Unit shall have a factory-installed, sloped conden-
sate drain pan made of a non-corrosive material, pro-
viding a minimum
3 /
4
-in. 14 NPT connection with both
vertical and horizontal drains, and shall comply with
ASHRAE Standard 62.
6. Unit shall have a factory-installed filter access panel
to provide filter access with tool-less removal.
7. Unit shall have standard thru-the-bottom gas and
power connection capability (accessory kit is
required).
C. Fans:
1. Indoor Fan:
a. Fan shall be belt driven with an adjustable-pitch
motor pulley. The standard fan drive shall have a
factory-installed low-medium static pressure fan
drive. The alternate fan drive option shall have a
factory-installed high-static pressure fan drive.
b. Fan wheel shall be double-inlet type with
forward-curved blades.
c. Bearings shall be sealed, permanently lubricated
ball-bearing type for longer life and lower
maintenance.
d. Bearings shall be pillow block type (180 only).
2. Indoor fan shall be made from steel with a corrosion-
resistant finish and shall be dynamically balanced.
3. Outdoor fan shall be of the direct-driven (with totally
enclosed motors) propeller type and shall discharge
air vertically.
4. Outdoor fan shall have aluminum blades riveted to
corrosion-resistant steel spiders and shall be dynam-
ically balanced.
D. Compressor(s):
1. Reciprocating semi-hermetic compressors with
factory-installed crankcase heaters.
2. Factory mounted on rubber grommets and internally
spring mounted for vibration isolation.
3. On independent circuits (180).
4. The size 150 unit semi-hermetic compressor shall be
equipped with an electric unloader for capacity
control.
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