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PACKAGED HEAT PUMP UNITS
CONSTANT VOLUME APPLICATION

HVAC GUIDE SPECIFICATIONS

SIZE RANGE:

2 TO 5 TONS, NOMINAL COOLING

BRYANT MODEL NUMBER:

604B

PART 1—GENERAL

SYSTEM DESCRIPTION

Outdoor rooftop or ground mounted, heat pump unit uti-
lizing a hermetic compressor for heating and cooling
duty and optional electric heating. Unit shall discharge
supply air vertically or horizontally as shown on contract
drawings. Outdoor fan/coil section shall have a draw-
thru design with vertical discharge for minimum sound
levels.

QUALITY ASSURANCE

A. Unit shall be rated in accordance with ARI Standards 210/

240-94 and 270-95.

B. Unit shall be designed in accordance with UL Standard

1995.

C. Unit shall be manufactured in a facility registered to ISO

9001 manufacturing quality standard.

D. Unit shall be UL listed and c-UL certified as a total package

for safety requirements.

E. Roof curb shall be designed to conform to NRCA Stan-

dards.

F. Insulation and adhesives shall meet NFPA 90A require-

ments for flame spread and smoke generation.

G. Cabinet insulation shall meet ASHRAE Standard 62P.

DELIVERY, STORAGE AND HANDLING

Unit shall be stored and handled per manufacturer’s

recommendations.

PART 2 — PRODUCTS

EQUIPMENT

A. General:

Factory-assembled, single-piece, heat pump unit. Con-
tained within the enclosure shall be all factory wiring, pip-
ing, controls, refrigerant charge (R-410A), and special
features required prior to field start-up.

B. Unit Cabinet:

1. Unit cabinet shall be constructed of phosphated, zinc-

coated, pre-painted steel capable of withstanding 500
hrs of salt spray.

2. Normal service shall be through a single removable

cabinet panel.

3. The unit shall be constructed on a rust proof unit base

that has an externally trapped, integrated sloped drain
pan.

4. Indoor fan compartment top surface shall be insulated

with a minimum 1/2-in. thick, flexible fiberglass insula-
tion, coated on the air side and retained by adhesive
and mechanical means. The indoor wall sections will
be insulated with a minimum semi-rigid foil-faced board
capable of being wiped clean. Aluminum foil-faced fi-
berglass insulation shall be used in the entire indoor air
cavity section.

5. Unit shall have a field-supplied condensate trap.

C. Fans:

1. The indoor fan shall be variable speed motor and con-

trol, as shown on equipment drawings.

2. Fan wheel shall be made from steel, and shall be dou-

ble-inlet type with forward curved blades with corrosion
resistant finish. Fan wheel shall be dynamically bal-
anced.

3. Outdoor fan shall be direct drive propeller type with alu-

minum blades riveted to corrosion resistant steel spi-
ders, be dynamically balanced, and discharge air
vertically.

D. Compressor:

1. Fully hermetic compressors with factory-installed vibra-

tion isolation.

2. Scroll compressors shall be standard on all units.
3. Compressor Protection:

Defrost control shall protect compressor by preventing
“short cycling.”

E. Coils:

Indoor and outdoor coils shall have aluminum plate fins
mechanically bonded to seamless copper tubes with all
joints brazed. (Copper/copper and vinyl-coated construc-
tion available as option.) Tube sheet openings shall be
belled to prevent tube wear.

F. Refrigerant Metering Device:

Refrigerant metering device shall be of the single body
fixed orifice feed type (outdoor) and TXV (indoor).

G. Filters:

Filter section shall consist of field-installed, throwaway, 1-
in. thick fiberglass filters of commercially available sizes.

H. Controls and Safeties:

1. Unit controls shall be complete with a self-contained

low voltage control circuit.

2. Units shall incorporate an internal compressor protec-

tor that provides reset capability.

3. Unit shall provide High and Low/Loss-of-Charge Pres-

sure Safety Protection.

Operating Characteristics:
1. Unit shall be capable of starting and running at 125°F