Scotsman FM2400R Service Manual page 20

FM2400R
OPERATION: Refrigeration
There are two separate refrigeration systems in this machine.
During the pump down cycle (usually initiated
by the circuit board de-energizing the liquid
line valve) the discharge gases flow through
their normal path to the remote condenser,
through the head pressure control, and into
the receiver. At this point the refrigerant flow
DISCHARGE
LINE
HEAD
PRESSURE
CONTROL
VALVE
PUMP DOWN
Refrigeration Schematic
LIQUID LINE
KING
VALVE
RECEIVER
December, 1988
is stopped by the closed liquid line valve. This
action forces the refrigerant into the receiver
and keeps it out of the compressor. The
pump down continues until the low pressure
control turns the compressor off.
LIQUID LINE
VALVE
SUCTION
LINE
COMPRESSOR
Page 20
REMOTE CONDENSER
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR