Service manual

Remote Air Cooled Refrigeration
The compressor concentrates the heat from ice
making into high pressure, hot discharge gas. The
high pressure forces the gas to the remote
condenser. At the remote condenser, the discharge
gas will either enter the coils or bypass them
through the headmaster. The head master
maintains a minimum discharge pressure to keep
flash gas out of the liquid line.
From the condenser, refrigerant flows to the
receiver. It can be either liquid or gas, depending
upon the modulation of the head master.
From the receiver, liquid refrigerant flows to the
thermostatic expansion valve. At the expansion
valve, liquid refrigerant passes from a high
pressure zone to one of relatively low pressure,
and in the low pressure zone it evaporates,
absorbing heat.
From the evaporator, the refrigerant, carrying the
heat from ice making, flows back to the compressor
through the suction line, and the cycle continues.
When enough ice has been made, the control
system closes the liquid line solenoid valve and the
machine pumps down, forcing refrigerant out of the
low side until the pump down pressure switch stops
the compressor.
September 2009
Page 26
N0422, F0522, N0622, F0822, N0922, F1222, N1322, F1522
Air, Water or Remote Service Manual
Refrigeration Schematic
Remote Air
Cooled
Condenser
Compressor
Discharge Line
Liquid Line
Thermostatic
Expansion
Valve
Suction Line
Evaporator
Headmaster
Receiver
Liquid Line
Solenoid Valve