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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.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at 125°F
ambient outdoor temperature, exceeding maximum
load criteria of ARI Standard 240-94.
2. Compressor with standard controls shall be capable of
operation down to 55° F ambient outdoor temperature in
cooling and -10°F in heating.
3. Fan on/off delay profile is selected (for compressor
modes) on the Easy Select™ board.
J. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single
location.
K. Motors:
1. Compressor motors shall be of the refrigerant-cooled
type with line-break thermal and current overload pro-
tection.
2. All fan motors shall have permanently lubricated bear-
ings, and inherent, automatic reset, thermal overload
protection.
3. Outdoor fan motor shall be totally enclosed.
GUIDE SPECIFICATIONS
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