Bryant 580D - Manual (Page 70)

GUIDE SPECIFICATIONS — 579F180-300
PACKAGED ROOFTOP ELECTRIC COOLING UNIT WITH
GAS HEAT — CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 15 TO 25 TONS, NOMINAL (COOLING)
172,000 to 360,000 BTUH, NOMINAL
(INPUT HEATING)
MODEL NUMBER: 579F
Part 1 — General
1.01 SYSTEM DESCRIPTION
Unit is an outdoor rooftop mounted, electrically controlled
heating and cooling unit utilizing a reciprocating semi-
hermetic compressor(s) for cooling duty and gas combus-
tion for heating duty. Supply air shall be discharged
downward or horizontally (with horizontal supply/return
curb adapter assembly), as shown on contract drawings.
Standard unit shall include a manual outdoor-air inlet.
1.02 QUALITY ASSURANCE
A. Unit (180-290) shall be rated in accordance with ARI
Standards 270 and 360 and all units shall be designed in
accordance with UL Standard 1995.
NOTE: The 579F300 is beyond the scope of the ARI cer-
tification program.
B. Unit shall be designed to conform to ASHRAE 15.
C. Unit shall be ETL and ETL, Canada tested and certified in
accordance with ANSI Z21.47 Standards as a total pack-
age.
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 manufactured in a facility registered to ISO
9002/BS5750, Part 2.
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:
The 579F unit shall be a factory assembled, single-piece
heating and cooling unit. Contained within the unit enclo-
sure 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 prepainted baked
enamel
finish.
2. Indoor blower compartment interior surfaces shall be
insulated with a minimum 1 ⁄
2
-in. thick, 1 lb density neo-
prene cooled, fiberglass insulation 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. Filters shall be accessible through an access panel.
5. Holes shall be provided in the base rails for rigging
shackles to facilitate overhead rigging.
6. Unit shall have a factory-installed internal condensate
drain connection and a sloped condensate pan.
C. Fans:
1. Indoor blower (evaporator fan):
a. Fan shall be belt driven. Belt drive shall include an
adjustable pulley. The standard fan drive shall
have a factory-installed low-medium static pres-
sure fan drive. The alternate fan drive option shall
have a factory-installed high static pressure fan
drive.
b. Fan wheel shall be made from steel with a corro-
sion resistant finish. It shall be a dynamically bal-
anced, double-inlet type with forward-curved
blades.
2. Condenser fans shall be of the direct-driven propeller
type, with corrosion-resistant blades riveted to
corrosion-resistant steel supports. They shall be dy-
namically balanced and discharge air upwards.
3. Induced-draft blower shall be of the direct-driven,
single inlet, forward-curved, centrifugal type. It shall
be made from steel with a corrosion-resistant finish
and shall be dynamically balanced.
D. Compressor(s):
1. The reciprocating semi-hermetic compressor(s) has
factory-installed external spring vibration isolation.
2. Factory-installed crankcase heater prevents refriger-
ant dilution of oil.
3. The 180 size semi-hermetic compressor shall be
equipped with an electric unloader for capacity con-
trol. Additional field-supplied unloaders are not recom-
mended on any 180-300 sizes.
4. Compressors shall be on mechanically and electrically
independent circuits (216-300 sizes).
E. Coils:
1. Standard evaporator and condenser coils shall have
copper or aluminum plate fins mechanically bonded to
seamless internally grooved copper tubes with all
joints brazed.
2. Optional precoated coils shall be coated with a
baked-on organic, epoxy, phenolic coating.
F. Heating Section:
1. Induced-draft combustion type with energy saving
direct-spark ignition system and redundant main gas
valve.
2. The heat exchanger shall be of the tubular-section
type constructed of a minimum of 20-gage steel
coated with a nominal 1.2 mil aluminum-silicone alloy
for corrosion resistance.
3. Burners shall be of the in-shot type constructed of
aluminum-coated steel.
4. All gas piping shall enter the unit at a single location.
G. Refrigerant Components:
Refrigerant circuit components shall include:
1. Fixed expansion device with filter driers.
2. Service valve gage and connections on suction, dis-
charge, and liquid lines.
3. Thermostatic expansion valve (size 180) or fixed ori-
fice feed system (sizes 216-300).
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