Bryant – Bryant 579F User Manual

Page 64

ENGINEERS’ SPECIFICATION GUIDE — MODELS 579F180-300 (15 TO 25 TONS)

GENERAL: Furnish and install single-package, outdoor rooftop-
mounted, electrically controlled, heating and cooling unit utiliz-
ing reciprocating compressor(s) for cooling and gas combustion
for heating duty. Unit shall discharge supply air vertically or hori-
zontally as shown on the contract drawings.

Nominal unit electrical characteristics shall be

3 ph, 60 Hz. The unit shall be capable of satisfactory operation
within voltage limits of

v to

COOLING CAPACITY: Total cooling capacity of the unit shall be

Btuh or greater, and sensible capacity shall be Btuh or

greater at conditions of

cfm evaporator air entering at

unit at

F dry bulb,

F wet bulb and condenser

entering air of

F dry bulb. Total design conditions shall

be a minimum of

Btuh/Watt.

HEATING CAPACITY: Total heating capacity of the unit shall be

Btuh or greater with a gas input of

Btuh.

CABINET: The cabinet shall be constructed of galvanized steel,
bonderized and coated with a prepainted, baked enamel finish.

COMPRESSOR: Compressor(s) shall be of the fully- or semi-
hermetic type with crankcase heaters (180 and 300) and suit-
able vibration isolators and dual independent refrigeration
circuits shall be supplied (216-300).

CONDENSER SECTION: The condenser coils shall have alu-
minum plate fins mechanically bonded to seamless copper
tubes with all joints brazed. Condenser fan shall be of the direct-
driven propeller type and shall discharge air vertically. Fan shall
have permanently lubricated bearings.

EVAPORATOR SECTION: Evaporator coils shall have alumi-
num plate fins mechanically bonded to seamless copper tubes
with all joints brazed. Evaporator fan shall be belt driven as
shown on the equipment drawings. Bearings shall be sealed,
permanently lubricated, ball-bearing type.

HEATING SECTION: The unit shall be equipped with an
induced-draft combustion system with energy saving intermit-
tent spark ignition and redundant main gas valve. The heat ex-
changer 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. Burners shall
be of the in-shot type constructed of aluminum coated steel.

REFRIGERANT SYSTEM: Refrigerant system shall include fil-
ter drier, fixed orifice feed system, and service gage connec-
tions on suction line, liquid line, and compressor discharge line,
as well as low-pressure and high-pressure protection.

FILTER SECTION: Filter section shall consist of factory-
installed low velocity, 2-in. thick fiberglass throwaway filters of
commercially available sizes. Filter access panel shall be easy
access.

CONTROLS: Unit shall be complete with self-contained low-
voltage control circuit. Safeties shall include compressor over-
temperature and overcurrent.

Heating section shall be provided with the following minimum
protection: High temperature limit switch, induced-draft pres-
sure switch, manual reset flame rollout switch and flame proving
controls.

OPTIONS: Factory-installed integrated economizer shall in-
clude all hardware and controls to provide cooling using outdoor
air alone or in conjunction with mechanical cooling. Dampers
shall be low leakage type, not to exceed 2% leakage at 1.0 in.
wg pressure differential. Economizer shall be capable of intro-
ducing up to 100% outdoor air and shall be equipped with a
gravity relief damper. Economizer controls shall be dry-bulb
type.

On all units where the factory-installed economizer is not cho-
sen, the factory-installed manual outdoor-air damper shall be in-
cluded.

APPROVALS: The unit shall be Warnock Hersey design certi-
fied and ETL tested and certified. All wiring shall be in accor-
dance with NEC and units shall meet ASHRAE Standard 62.
The unit shall be rated in accordance with ARI Standards 360
and 270. Units shall be designed to conform to NRCA stand-
ards. Insulation and adhesive shall meet NFPA 90A require-
ments for flame spread and smoke generation.

ACCESSORIES: Field-installed accessories shall include: Roof
curb (14 in. or 24 in.), horizontal adapter, economizer, two-
position damper, low-ambient kit, Time Guard

ா

II short-cycle cir-

cuit protection, thermostat and subbase, barometric relief
damper, power exhaust, head pressure control device, winter
start time-delay relay, fan/filter status switch, and enthalpy con-
trol sensor.

Bryant

Air Conditioning

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

UNIT MUST BE INSTALLED IN ACCORDANCE

WITH INSTALLATION INSTRUCTIONS

Printed in U.S.A.

3/95

CATALOG NO. BY-3258-016