ECSS E3335
- 26 -
REFRIGERATION OPERATION
Self Contained Models
Refrigeration R404 Charge
6 Pounds
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.
Self Contained Refrigeration Operation
The unit temperature is controlled by the Electronic control and timers 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
CHARGED IN FIELD
Remote Low Press. Switch Cut In
50 psi
Remote Low Press. Switch Cut Out
15 psi
Adjustable Head Master
200 psi
Remote High Press. Switch Cut Out
400 psi
The remote models are designed to use 448/ 449A refrigerant and shipped from the factory with
the evaporator coil, expansion valve, sight glass and refrigerant solenoid valve. Drier filter most
be installed in field for proper operation. 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.
The condensing unit and pressure controls are optionally supplied from the factory for remote
location installation. The condensing unit must be mounted and wired by the installer. The high
low pressure switch must be wired in series with the compressor power supply as shown in
diagram below.
