Operation: Refrigeration - Scotsman FM1202RL Service Manual

Single System RL

OPERATION: Refrigeration

LIQUID
The remote high side supplies high
LINE
pressure liquid refrigerant to the
liquid line connection on the ice
machine. After the sight glass, there
SIGHT GLASS
is a liquid line leading to a liquid line
valve. When the ice level sensor
causes the circuit board to energize
the liquid line valve, the valve
opens, allowing the liquid refrigerant
to enter the expansion valve. The
thermostatic expansion valve
HAND VALVE
meters the liquid refrigerant into the
evaporator, where it boils off
(evaporates) and absorbs heat. It
LIQUID LINE
then moves through the ball valve
VALVE
and into the evaporator pressure
regulator valve, or EPR. The EPR
THERMO VALVE
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
EVAPORATOR
suction line of the remote high side
system.
BALL VALVE
SUCTION LINE
EPR VALVE
January 1997
Page 12