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GEM0650/0956/1256 Remote Operation: Refrigeration
Page 22
Low Condensing Temperature
The refrigeration system under low condenser air temperatures is much the same as it is under higher
temperatures, with the exception that the resulting low head pressures cause the head pressure control to
close off the liquid line between the condenser and the receiver.
This forces more refrigerant into the condenser (with a small amount of discharge gas going into the receiver to
maintain pressure until the head pressure is built back up to 180 PSIG). At that pressure the valve opens up
the liquid line from the condenser to the receiver.
Refrigeration Schematic
Remote Condenser
Discharge
Line
Liquid Line
Detail of Head Pressure Control Valve
Head Pressure
Control Valve
Receiver Com
p
ressor
Eva
p
orator
Suction Line
Thermostatic Ex
p
ansion Valve
Liquid Line Valve