Remote Air Cooled Refrigeration - Scotsman Prodigy Plus A Series Service Manual

NH0422, NS0422, FS0522, NH0622, NS0622, FS0822, NH0922, NS0922, FS1222, NH1322, NS1322, FS1522
Air, Water or Remote 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
Headmaster
Receiver
Discharge Line
Liquid Line
Refrigeration Schematic
July 2020
Page 29
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.
Suction Line
Compressor
Liquid Line Solenoid Valve
Remote Air Cooled
Condenser
TXV