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DEFROST
Control Display
The control display is located in the unit base. It is programmed to display the current
temperature from the control sensor located inside the center tower at the top.
Refrigeration Operation
Self Contained Models
The self-contained models are shipped from the factory with a completely operational 404A refrigeration
system and require no modifications or adjustments upon installation. Case must be installed as per the
installation section of this manual to provide proper condensing air cooling.
The unit temperature is controlled by the Electronic control outlined in the control section of this manual.
Note: The condenser fan runs continuously.
Remote Models Use pressure gauges to set pressure control.
Refrigeration R404 Charge
Remote Low Press. Switch Cut In
Remote Low Press. Switch Cut Out
Adjustable Head Master
Remote High Press. Switch Cut Out
The remote models are designed to use 404A refrigerant and shipped from the factory with the evaporator
coil, expansion valve, sight glass, and refrigerant solenoid valve. Filter Drier must be installed in field.
Electronic control runs identical to the Self Contained models except the electronic control opens and
closes a refrigeration solenoid valve located on the suction line instead of turning on and off a compressor.
The solenoid valve closes and shuts off the refrigeration flow to the unit and initiates a pump down cycle.
This will allow the remote low pressure switch to open and shut off remote compressor.
Defrost
38
Termination
Temperature
Time to First
39
Defrost
(hh:mm)
Time to
40
subsequent
Defrost
Defrost Max
41
Duration
41ºF
43ºF
6 hr
8 hr
6 hr
8 hr
1 hr
30 min
- 29 -
CHARGED IN FIELD
50 psi
15 psi
200 psi
400 psi
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