CONTROLS & ADJUSTMENTS FOR CONVENTIONAL OPERATION
(Single Compressor System)
Refrigeration temperature may be controlled by either the condensing unit’s low-pressure
control or by an (optional) refrigeration thermostat, (one per condensing unit). Thermostatic
control is preferred since it will provide a more constant year-round control of temperature. The
thermostat may be field or factory installed, must have a differential of 3° F to 6° F and have its
sensing bulb located to monitor the air leaving the evaporator. One thermostat per condensing
unit is required and should be wired into the compressor motor contactor control circuit.
A pump down system is recommended for outdoor condensing units.
ISFGG / RGG, models have electrical defrost and are time initiated with pressure
termination.
For Koolgas application, a Klixon sensor is mounted on the coil to provide a temperature
termination control signal.
ISMGG / RGG model is off-time defrost.
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