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.
Step
q
w
e
r
t
[Preperation]
Turn on
Automatic pump
down.
Normal operation
for 30 minute
※1
［
Pump down
］※
2
［
Termination]
EV full close
Termination
"
GOOD"
Pump down
start
Compressor
stop at
LP
≦
–55kPa
Compressor
stop for 20
seconds.
COMP
ON
ON
OFF
OFF
OFF
EFM
High speed
High speed
High speed
OFF
OFF
CFM
ON
ON
ON
OFF
OFF
LSV
ON
ESV
ON
ISV
ON (2nd)
※
3
HSV
ON (1st)
※
3
EV
77pls(18%)
146pls(34%)
146pls(34%)
146pls(34%)
0pls(fullclose)
［
Pressure
equalizing
］
All stop for 40
seconds.
Prevention of air mixing
(vacuum) in the system
DSV
BSV
SMV
328pls(100%)
328pls(100%)
328pls(100%)
328pls(100%)
328pls(100%)
RSV
Refrigerant collected line after automatic pump down operation
HSV
Compressor
Reheat coil (optional)
BSV
DSV
LSV
ESV
EV
Evaporator
RSV
DPR
Condenser
Checkvalve
Receiver
SMV
ISV
Drier
※
1. If HPT exceeds 1700 kPA, no operation is executed for thirty seconds.
※
2. The pumpdown operation described in
w
⇒
e
shown in the table above is repeated
depending on the status 20 seconds after the compressor is stopped (three times, maximally).
※
3. If LPT exceeds 0 kPa 40 seconds after the unit is stopped completely, next operation of
shifting from "HSV ON" to "ISV ON" is not executed.
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