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4-4
(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.
q
w
e
r
t
[Preperation]
Turn on
Automatic pump
down.
Normal operation
for 1 minute
[Pump down-Twice]
w
→
e
→
w
→
e
[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)
SMV
ON
ON
ON
ON
ON
ESV
ON
→
OFF
DSV
HSV
ON (1st)
BSV
ISV
ON (2nd)
Increase
pressure to
0~300Kpa in
low pressure
side.
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