N0922L, N1322L, F1222L, F1522L
Remote Low Side Service Manual Includes Prodigy Plus
December 2014
Page 19
Remote Refrigeration with Condensing Unit
A condensing unit's compressor concentrates the heat
from ice making into high pressure, hot discharge gas.
The high pressure forces the gas to the 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 ice
making head's 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
condensing unit, when used, pumps down, forcing
refrigerant out of the low side until its pump down
pressure switch stops the compressor.
Remote Low Side Refrigeration Schematic
Generic
Condensing
Unit
Liquid
Suction
Ice Making Head
EPR
Liquid Line
Valve
TXV
