Filter
Top Products
97
GUIDE SPECIFICATIONS — 548F AND 549B036-120 UNITS
PACKAGED ROOFTOP AIR-TO-AIR HEAT PUMP —
CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 3 TO 10 TONS, NOMINAL (COOLING)
BRYANT MODEL NUMBER: 548F,
549B
PART 1 — General
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, electrically controlled air-to-air
heat pump unit utilizing a hermetic reciprocating (548F) or
scroll (549B) compressor for cooling and heating duty and
electric resistance coils for auxiliary 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.
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, and
shall be manufactured in a facility registered to ISO 9002/
BS5750, Part 2.
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
status 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 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 or
reciprocating type.
2. Factory mounted on rubber grommets and internally
spring mounted for vibration isolation.
3. On independent circuits (548F090-120 and
549B090,120).
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. 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.
50TFQ004-012
548F/549B036-120