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
FME1500R
June 1994
Page 18
