Bryant 549B - Manual (Page 135)

135
GUIDE SPECIFICATIONS — 549B036-120, 549C024-060
PACKAGED ROOFTOP AIR-TO-AIR HEAT PUMP —
CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 2 TO 10 TONS, NOMINAL (COOLING)
34,800 TO 114,000 BTUH, NOMINAL
(HEATING)
4 TO 50 kW NOMINAL (ELECTRIC
HEATING)
BRYANT MODEL NUMBER:
549B
549C
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, electrically controlled air-to-air
heat pump unit utilizing a scroll compressor for cooling
duty and electric resistance coils for heating duty. Unit
shall discharge supply air vertically or horizontally 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. A factory-supplied print-
out indicating tested pressures, amperages, data, and
inspectors; providing certification of the unit status at the
time of manufacture shall be provided upon request.
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.
Contained 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. Evaporator fan compartment interior cabinet sur-
faces 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 power con-
nection capability (accessory kit is required).
C. Fans:
1. Indoor Fan:
a. Fan shall be direct or belt driven as shown on the
equipment drawings. Belt drive shall include an
adjustable-pitch motor pulley.
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.
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. Fully hermetic type, internally protected scroll-type.
2. Factory mounted on rubber grommets and internally
spring mounted for vibration isolation.
3. On dual electrically and mechanically independent
circuits (090-120).
E. Coils:
1. Standard indoor and outdoor coils shall have copper
or aluminum plate fins mechanically bonded to
seamless internally grooved copper tubes with all
joints brazed.
2. Testing:
a. Indoor and outdoor coils shall be qualified to UL
1995 burst test at 2,200 psi.
b. Indoor and outdoor coils shall be leak tested to
150 psig and pressure tested to 400 psig.
549
B, 5
49C