Scotsman NME650R Service Manual page 19

OPERATION: Refrigeration
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.
DISCHARGE
LINE
HEAD
PRESSURE
CONTROL
VALVE
PUMP DOWN
Refrigeration Schematic
LIQUID LINE
KING
VALVE
RECEIVER
At this point the refrigerant flow 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
August 1993
Page 19
NME650R
REMOTE CONDENSER
THERMOSTATIC
EXPANSION
VALVE
EVAPORATOR