Nm1250r, Operation: refrigeration, Pump down – Scotsman NM1250R User Manual
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OPERATION: Refrigeration
PUMP DOWN
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
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 pump down
control, opens turning the compressor off.
REMOTE CONDENSER
LIQUID LINE VALVE
(CLOSED)
COMPRESSOR
RECEIVER
LIQUID LINE
DISCHARGE
LINE
NM1250R
November, 1988
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