Remote Refrigeration With Condensing Unit Or Rack - Scotsman Prodigy Plus A Series Service Manual

FS2330L
Remote Low Side Service Manual

Remote Refrigeration with Condensing Unit or Rack

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.
The EPR valve in the ice machine keeps the suction
pressure at the correct pressure, regardless of a lower
pressure in the suction line between the ice machine
and the condensing unit or rack.
When enough ice has been made, the control
system closes the liquid line solenoid valve and the
condensing unit, when used, pumps down (a rack will
likely continue to operate), forcing refrigerant out of
the low side until its pump down pressure switch stops
the compressor.
December 2022
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