Operation: Refrigeration - Scotsman FME2400RL Service Manual

OPERATION: Refrigeration

The remote high side supplies high pressure liquid
refrigerant to the liquid line connection on the ice
machine. After the sight glass, there are two
separate liquid lines, each leading to a liquid line
valve. When the individual ice level sensor causes
the circuit board to energize the liquid line valve,
the valve opens, allowing the liquid refrigerant to
enter that expansion valve. The thermostatic
expansion valve meters the liquid refrigerant into
the evaporator, where it
boils off (evaporates) and
absorbs heat. It then
moves through the ball
valve and into the
evaporator pressure
regulator valve, or EPR.
The EPR keeps the
evaporator pressure
above a predetermined
point, even though the
suction line pressure of
the remote high side
system may vary. The
refrigerant, now a low
pressure gas, moves into
the suction line of the
remote high side system.
SUCTION LINE
LIQUID
SIGHT GLASS
HAND VALVE
LIQUID LINE
VALVE
THERMO VALVE
EVAPORATORS
BALL VALVES
November 2000
Page 13
Double System RL
LINE
EPR VALVE