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GUIDE SPECIFICATIONS — 580D036-150
PACKAGED ROOFTOP ELECTRIC COOLING UNIT
WITH GAS HEAT — CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 3to12
1
⁄
2
TONS, NOMINAL (COOLING)
72,000 TO 250,000 BTUH, NOMINAL
(INPUT HEATING)
MODEL NUMBER: 580D
Part 1 — General
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, electrically-controlled heating
and cooling unit utilizing a hermetic compressor(s) for
cooling duty and gas combustion for heating duty. Unit
shall discharge supply air vertically or horizontally as
shown on contract drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/
240 or 360 and 270. Designed in accordance with UL
Standard 1995.
B. Unit shall be designed to conform to ASHRAE 15, latest
revision.
C. Unit shall be UL-tested and certified in accordance
with ANSI Z21.47 Standards and UL listed and certified
under Canadian standards as a total package for safety
requirements.
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 designed in accordance with ISO 9001, and
shall be manufactured in a facility registered to ISO 9002/
BS5750, Part 2.
H. Each 580D unit is subjected to completely automated run
testing on the assembly line. Each unit contains a factory-
supplied printout indicating tested pressures, amperages,
data, and inspectors; providing certification of the unit sta-
tus at the time of manufacture.
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:
Factory assembled, single-piece heating and cooling unit.
Contained within the unit 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 galvanized steel,
and shall be bonderized and coated with a prepainted
baked enamel finish on all externally exposed
surfaces.
2. Evaporator fan compartment interior cabinet surfaces
shall be insulated with a minimum
1
⁄
2
-in. thick, flexible
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. Holes shall be provided in the base rails for rigging
shackles to facilitate maneuvering and overhead rig-
ging.
5. Unit shall have a factory-installed, sloped condensate
drain pan made of a non-corrosive material, providing
a minimum
3
⁄
4
-in. connection with both vertical and
horizontal drains, and shall comply with ASHRAE
Standard 62.
6. Unit shall have a factory-installed filter access panel to
provide filter access with tool-less removal.
7. Unit shall have standard thru-the-bottom power
connection capability.
C. Fans:
1. Evaporator Fan:
a. Fan shall be direct or belt driven as shown on the
equipment drawings. Belt drive shall include an
adjustable-pitch motor pulley.
b. Fan wheel shall be double-inlet type with forward-
curved blades.
c. Bearings shall be sealed, permanently lubri-
cated ball-bearing type for longer life and lower
maintenance.
2. Evaporator fan shall be made from steel with a
corrosion-resistant finish and shall be dynamically
balanced.
3. Condenser fan shall be of the direct-driven propeller
type and shall discharge air vertically.
4. Condenser fan shall have aluminum blades riveted
to corrosion-resistant steel spiders and shall be dy-
namically balanced.
5. Induced-draft blower shall be of the direct-driven,
single inlet, forward-curved centrifugal type, made
from steel with a corrosion-resistant finish and shall be
dynamically balanced.
D. Compressor(s):
1. Fully hermetic type, internally protected.
2. Factory spring-shock mounted and internally spring
mounted for vibration isolation.
3. On independent mounting circuits (090-150).
E. Coils:
1. Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to copper tubes with
all joints brazed.
2. Tube sheet openings shall be belled to prevent tube
wear.
3. Evaporator coil shall be of the face-split design which
proves effective in removing additional moisture from
the supply air.
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 cabinet at a
single location.
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