Bryant 549B - Manual (Page 69)

69
GUIDE SPECIFICATIONS — 548F036-120
PACKAGED ROOFTOP AIR-TO-AIR HEAT PUMP WITH
ELECTRIC HEAT OPTION — CONSTANT VOLUME
APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 3 TO 10 TONS, NOMINAL (COOLING)
34,400 TO 105,000 BTUH,
NOMINAL (HEATING)
4 TO 50 kW NOMINAL (ELECTRIC HEATING)
BRYANT MODEL NUMBER: 548F
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop-mounted or slab-mounted, electrically
controlled air-to-air heat pump utilizing a hermetic com-
pressor for heating and cooling 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 and 270.
B. Unit shall be designed to conform to ASHRAE 15, latest
revision, and in accordance with UL 1995.
C. Unit shall be UL tested and certified in accordance
with ANSI Z21.47 Standard 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 Federal Test
Method Standard No. 141 (Method 6061) 500-hour salt
spray test.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit(s) shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT (STANDARD)
A. General:
Factory-assembled, single-piece, air-to-air heat pump.
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,
bonderized and coated with a baked enamel finish
on all externally exposed surfaces with primer coated
internal panels.
2. Indoor fan cabinet interior shall be insulated with a
minimum 1 /
2
-in. thick flexible fiberglass insulation
coated on the air side.
3. Cabinet panels shall be easily removable for
servicing.
4. Holes shall be provided in the base rails for rigging
shackles to facilitate overhead rigging, and forklift
slots shall be provided to facilitate maneuvering.
5. Unit shall have a factory-installed, sloped conden-
sate drain pan made of a non-corrosive material,
providing a minimum
3 /
4
-in. connection with both
vertical and horizontal drains and shall comply with
ASHRAE 62.
6. Unit shall have 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.
C. Fans:
1. Indoor blower shall be of the direct-driven or
belt-driven, double inlet, forward-curved centrifugal
type. Belt drive shall include an adjustable-pitch
motor pulley.
2. Indoor blower shall be made from steel with a corro-
sion-resistant finish and shall be dynamically
balanced.
3. Bearings shall be of the sealed, permanently lubri-
cated, ball-bearing type for longer life and lower
maintenance.
4. Outdoor fan shall be of the direct-driven propeller
type and shall discharge air vertically.
5. 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.
2. Factory rubber shock-mounted and internally spring
mounted for vibration isolation.
E. Coils:
1. Outdoor and indoor coils shall have aluminum plate
fins mechanically bonded to enhanced copper tubes
with all joints brazed.
2. Tube sheet openings shall be belled to prevent tube
wear.
3. Indoor coil shall be of the face split design.
4. Coils:
a. Copper-fin coils shall be constructed of copper
fins mechanically bonded to copper tubes and
copper tube sheets. Galvanized steel tube sheets
shall not be acceptable. A polymer strip shall pre-
vent coil assembly from contacting the sheet
metal coil pan to minimize potential for galvanic
corrosion between coil and pan. All copper con-
struction shall provide protection in moderate
coastal environments.
b. E-Coated aluminum-fin coils shall have a flexible
epoxy polymer coating uniformly applied to all coil
surface areas without material bridging between
fins. Coating process shall ensure complete coil
encapsulation. Color shall be high gloss black
with gloss — 60 deg of 65 to 90% per ASTM
D523-89. Uniform dry film thickness from 0.8 to
1.2 mil on all surface areas including fin edges.
Superior hardness characteristics of 2H per
ASTM D3363-92A and cross-hatch adhesion of
4B-5B per ASTM D3359-93. Impact resistance
shall be up to 160 in./lb (ASTM D2794-93).
Humidity and water immersion resistance shall be
up to minimum 1000 and 250 hours respectively
(ASTM D2247-92 and ASTM D870-92). Corro-
sion durability shall be confirmed through testing
to be no less than 1000 hours salt spray per
ASTM B117-90. Coil construction shall be alumi-
num fins mechanically bonded to copper tubes.
548F