Specifications
Form No. PDS 580F.36.1
COMMERCIAL
SINGLE PACKAGE ROOFTOP
GAS HEATING/ELECTRIC COOLING UNITS
Model 580F
The Dura
Pac
Series
Sizes 036-150
3 to 12
1
/
2
To n s
Standard-Efficiency Rooftop Units with:
• Exclusive integrated gas control board with diagnostics
• Alumagard™ heat exchanger coating
• Induced-draft fan for gas combustion
• Tubular, dimpled heat exchangers
• Pre-painted galvanized steel cabinet for long life and quality
appearance
• Commercial strength base rails with built-in rigging capability
• Convertible design for vertical or horizontal supply/return
• Non-corrosive, sloped condensate drain pan, meets
ASHRAE 62 (IAQ)
• Two-inch return-air filters (IAQ)
• A wide assortment of factory-installed options available,
including high static drives that provide additional perfor-
mance range
• High and low (loss-of-charge) pressure switches and
freezestat
• Refrigerant filter drier
FEATURES/BENEFITS
Every compact one-piece unit arrives fully assembled,
charged, tested, and ready to run.
INTEGRATED GAS CONTROLLER (IGC) —
All ignition com-
ponents are contained in the compact IGC which is easily
accessible for servicing. The IGC control board provides built-
in diagnostic capability. An LED (light-emitting diode) simplifies
troubleshooting by providing visual fault notification and system
status confirmation.
The IGC also contains an exclusive anti-cycle protection for
gas heat operation. After 4 continuous cycles on the unit high-
temperature limit switch, the gas heat operation is disabled,
and an error code is issued. This feature greatly improves reli-
ability of the rooftop unit.
The IGC also contains burner control logic for accurate and
dependable gas ignition. The LED is visible without removing
the unit control box access panel. This LED fault-notification
system reduces service person troubleshooting time and mini-
mizes service costs. The IGC also maximizes heating effi-
ciency by controlling indoor-fan on and off delays.
QUIET, EFFICIENT OPERATION AND DEPENDABLE PER-
FORMANCE —
Compressors have vibration isolators for quiet
operation. Efficient fan and motor design permits operation at
low sound levels and all 580F units are mounted either on
mounting plate (036-072) or on an exclusive polycore plate
(090-150).
The 580F090-150 units offer lower utility costs through part-
load operation using 2 stages of cooling.
Quiet and efficient operation is provided by two-speed direct-
drive evaporator fans on sizes 036-060 and by belt-driven
evaporator fans (on all units). The belt-driven evaporator-fans
are equipped with variable-pitch pulleys which allow adjust-
ment within the rpm ranges of the factory-supplied pulleys.
Increased operating efficiency is achieved through computer-
designed coils featuring staggered internally enhanced copper
tubes. Fins are ripple-edged for strength, lanced, and double
waved for higher heat transfer.
Tubular, dimpled gas heat exchangers optimize heat transfer
for improved efficiency. The tubular design permits hot gases to
make multiple passes across the path of the supply air. The
dimpled design creates a turbulent gas flow to maximize heat-
ing efficiency.
The California Air Quality Management Districts NO
x
require-
ment of 40 nanograms/joule or less is met on 036-060 size Low
NO
x
models.
The extra thick Alumagard™ heat exchanger coating provides
corrosion resistance and ensures long life. Low NO
x
models
have 409 stainless steel firing tubes.
The unsightly appearance of flue stacks is eliminated and the
effects of wind on heating operations are diminished by the
induced draft combustion system. The inducer fan draws hot
combustion gas through the heat exchanger at the optimum
rate for the most effective heat transfer. The heat exchanger
operates under negative pressure, preventing flue gas leakage
into the indoor supply air.
During the Heating mode, the evaporator-fan relay automati-
cally starts the evaporator fan after the heat exchanger warms
up to a suitable temperature. The 30-second fan delay prevents
cold air from entering the supply duct system when the condi-
tioned space is calling for heat to maximize efficiency and
comfort.
The direct-spark ignition system saves operating expense
when compared to pilot ignition systems. No crossover tube is
required, therefore no sooting or pilot fouling problems can
occur.
All 580F standard units are designed for natural gas, but an
accessory LP (liquid propane) conversion kit is available.
580F036-072
580F090-150










