IMSS E3265
REFRIGERATION OPERATION
Self-Contained Models
The self-contained models are shipped from the factory with a completely operational
R449A 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
BTU Requirements
12,800 BTU’S @20F EVAP / 90F Ambient
16,400 BTU’S @20F EVAP / 90F Ambient
25,200 BTU’S @20F EVAP / 90F Ambient
Pressure Control Settings
- Use pressure gauges to set pressure control.
Remote Low Press. Switch Cut In
Remote Low Press. Switch Cut Out
Remote High Press. Switch Cut Out
The remote models are designed to use R449A 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 on the next page.
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