PROVEN COMPRESSOR RELIABILITY — Design techniques
feature computer programmed balance between compressor,
condenser, and evaporator. Hermetic (036-150 units) and semi-
hermetic (180-300 units) compressors with suction and
discharge service valves are equipped with compressor over-
current and overtemperature protection to ensure dependability.
Crankcase heaters (180-300 units) prevent refrigerant dilution
of oil during off cycles and ensure proper lubrication at start-up
to prolong compressor life. Crankcase heaters are not neces-
sary on 036-150 units due to high-side crankcase design (sizes
072,150) and low refrigerant charge levels (sizes 036-150).
The 579F180 unit (with factory-supplied unloading) is equipped
with a thermostatic expansion valve to precisely adjust refriger-
ant flow during Stage 1 (unloaded) operation. All other 579F/
580D units have the exclusive Acutrol™ metering device which
precisely controls refrigerant flow, preventing slugging and
flood-back, while maintaining optimum unit performance.
Additional unloaders are not recommended on the 579F180-
300 units.
INTEGRATED ECONOMIZERS AND OUTDOOR AIR —
Optional economizers and manual outdoor-air dampers intro-
duce outdoor air which mixes with the conditioned air, improving
indoor air quality and often reducing energy consumption.
During a first stage call for cooling, if the outdoor-air tempera-
ture is below the control changeover set point, the discharge-air
sensor modulates the economizer outdoor-air damper open to
achieve the changeover set point. When second-stage cooling
is called for, the compressor is energized in addition to the
economizer. If the outdoor-air temperature is above the change-
over set point, the first stage of compression is activated and
the economizer stays at vent position. Economizer operation is
controlled by Accusensor™ I dry-bulb thermostat that senses
outdoor-air temperature. Accessory upgrade kits include Accu-
sensor II solid-state enthalpy control (sizes 036-150) and Accu-
sensor III enthalpy sensor.
The Durablade economizer (option or accessory) on the
580D036-150 units has a reliable sliding plate damper which is
easily adjusted for 100% outdoor air, 100% return air, or any
proportions of mixed air.
The 580D036-150 units can also utilize the optional Parablade
economizer. This economizer incorporates a parallel-opposed
blade design with standard enthalpy controls. In addition, the
Parablade economizer has a spring return built into the damper
motor to provide reliable close-on-power-loss. The Parablade
economizer comes equipped with up to 45% barometric relief
capability for high outdoor airflow applications.
For units without economizer, year-round ventilation is en-
hanced by a manual outdoor-air damper (ordered as standard
on 579F180-300; ordered as an accessory or an option
on 580D036-150 units). The damper can be preset to admit
up to 25% outdoor air (sizes 180-300) or 50% outdoor air
(sizes 036-150).
In addition, the barometric relief damper or power exhaust
accessory can be utilized to help maintain proper building
pressure.
INDOOR-AIR QUALITY — Sloped condensate pans minimize
biological growth in rooftop units in accordance with ASHRAE
(American Society of Heating, Refrigeration, and Air Condition-
ing Engineers) Standard 62-89. Two-inch filters with optional
dirty filter indicator switch provide for greater particle reduction
in the return air. The face-split evaporator coils improve the de-
humidification capability of standard units, and standard en-
thalpy controls provided with the optional or accessory (sizes
036-150) economizers maximize building humidity control.
TABLE OF CONTENTS
Page
Features/Benefits ..........................1-3
Model Number Nomenclature ...................4,5
ARI Capacity Ratings ........................6,7
Physical Data ............................8-13
Options and Accessories .....................14-16
Base Unit Dimensions .......................17-20
Accessory Dimensions ......................21-24
Selection Procedure .........................25
Performance Data .........................26-55
Electrical Data ............................56,57
Typical Piping and Wiring ....................58,59
Typical Wiring Schematics ....................60-62
Controls ................................63,64
Application Data ..........................65,66
Guide Specifications ........................67-72
3
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