4-19
(2) Automatic pump down operation
Once the automatic pump down is started, all of the service works from refrigerant collection into
the receiver, to the equalizing in suction piping system, can be executed automatically.
When "Good" is displayed, service works such as replacing the dryer, etc. can be conducted
without any other operation.
qwert
[Preperation]
Turn on
Automatic pump
down.
Normal operation
for 1 minute
[Pump down-Twice]
w→e→r→w→e→r
[Termination]
EV full close
Termination
GOOD
Pump down
start
Compressor
stop at
LP≦–55kPa
Compressor
stop for 20
seconds.
Compressor ON ON OFF OFF OFF
LSV ON
EV ON ON ON ON ON (full close)
SMVONONONONON
ESV
ON→OFF
DSV
HSV ON (1st)
BSV
ISV ON (2nd)
: Refrigerant
Increase
pressure to
0~300Kpa in
low pressure
side.
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