Bryant 548F User Manual

Page 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

-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

-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.

00
4-
01
2

548

F/
549

B0
36-

This manual is related to the following products:

542J