Filter
Top Products
GUIDE SPECIFICATIONS
PACKAGED GAS HEATING/ELECTRIC COOLING UNITS
CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 2 to 5 TONS, NOMINAL COOLING
40,000 TO 130,000 BTUH
NOMINAL HEATING INPUT
BRYANT MODEL NUMBER: 583A
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit
utilizing a hermetic compressor for cooling duty. Unit shall
discharge supply air vertically or horizontally as shown on
contract drawings. Condenser fan/coil section shall have a
draw-thru design with vertical discharge for minimum
sound levels.
1.02 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 CSA certified as a total pack-
age for safety requirements.
E. Roof curb shall be designed to conform to NRCA
Standards.
F. Insulation and adhesives shall meet NFPA 90A require-
ments for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62P.
1.03 DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT
A. General:
Factory-assembled, single-piece, heating and cooling
unit. Contained within the 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 phosphated, zinc-
coated, pre-painted steel capable of withstanding
500 hours in salt spray.
2. Normal service shall be through a single removable
cabinet panel.
3. The unit shall be constructed on a rust proof basepan
that has an externally trapped, integrated sloped drain
pan.
4. Evaporator fan compartment top surface shall be insu-
lated with a minimum
1
⁄
2
-in. thick, flexible fiberglass in-
sulation, coated on the air side and retained by
adhesive and mechanical means. The evaporator wall
sections will be insulated with a minimum semi-rigid
foil-faced board capable of being wiped clean. Alumi-
num foil-faced fiberglass insulation shall be used in
the entire indoor air cavity section.
5. Unit shall have a field-supplied condensate trap.
C. Fans:
1. The evaporator fan shall be 3-speed, direct-drive, as
shown on equipment drawings.
2. Fan wheel shall be made from steel, and shall be
double-inlet type with forward curved blades with cor-
rosion resistant finish. Fan wheel shall be dynamically
balanced.
3. Condenser fan shall be direct drive propeller type with
aluminum blades riveted to corrosion resistant steel
spiders, be dynamically balanced, and discharge air
vertically.
D. Compressor:
1. Fully hermetic compressors with factory-installed vi-
bration isolation.
2. Scroll compressors shall be standard on all units.
E. Coils:
Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless copper tubes
with all joints brazed (copper/copper and vinyl-coated
construction available as option). Tube sheet openings
shall be belled to prevent tube wear.
F. Heating Section:
1. Induced-draft combustion type with energy saving di-
rect spark ignition system and redundant main gas
valve.
2. Induced-draft motors shall be provided with solid-state
hall-effect sensor to ensure adequate airflow for
combustion.
3. The heat exchangers shall be constructed of alumi-
nized steel for corrosion resistance.
4. Burners shall be of the in-shot type constructed of alu-
minum coated steel.
5. All gas piping and electric power shall enter the unit
cabinet at a single location.
G. Refrigerant Components:
Refrigerant components shall be of the fixed orifice feed
type.
H. Filters:
Filter section shall consist of field-installed, throwaway,
1-in. thick fiberglass filters of commercially available
sizes.
I. Controls and Safeties:
1. Unit controls shall be complete with a self-contained
low voltage control circuit.
2. Compressors shall incorporate a solid-state compres-
sor protector that provides reset capability.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at 125 F
ambient outdoor temperature per maximum load crite-
ria of ARI Standard 210.
2. Compressor with standard controls shall be capable of
operation down to 40 F ambient outdoor temperature.
3. Units shall be provided with fan time delay to prevent
cold air delivery before the heat exchanger warms up.
4. Unit shall be provided with 30-second fan time delay
after the thermostat is satisfied.
K. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single
location.
25