Scotsman CME855A - Manual (Page 13)

Drier
Thermostatic
Expansion Valve
Hot Gas Valve
Condenser
Suction
Line
Evaporators
Compressor
Hot
Gas
Line
Refrigeration System Schematic
REFRIGERATION SYSTEM OPERATION
FREEZE CYCLE
The compressor forces the refrigerant into the
discharge tube. The refrigerant, now a very hot,
high pressure gas flows to the condenser. At the
condenser the refrigerant’s heat is transferred to
the air blowing thru the condenser. The refrigerant
changes from a gas to a liquid.
After the condenser, the now liquid refrigerant
flows thru the thermostatic expansion valve. The
thermostatic expansion valve liquid refrigerant thru
the refrigerant distributor and into the three
evaporators.
Inside the evaporators, the liquid refrigerant rapidly
expands, because it has moved from a high
pressure zone to one of much lower pressure. The
heat from the water going over the evaporators
keeps the refrigerant expanding, and the
refrigerant absorbs this heat. This causes the
evaporators and the water going over them to
loose heat.
The refrigerant then flows into the suction line and
back to the compressor.
HARVEST CYCLE
The only change between freeze and harvest is
that a valve opens a path between the discharge
line and the evaporator inlet. This valve is called
the Hot Gas Valve. It allows hot discharge
refrigerant gas to flow directly from the compressor
to the evaporator inlet, warming the evaporators
and causing the ice cubes to release.
CME855A & CME1000A
October, 1994
Page 13