4-3
4.1.3 Automatic Pump Down
An automatic pump down system is applied to the unit to prevent the unit from extra decrease of low
pressure due to pump down operation or burning of scroll compressor due to a close stop valve.
(1) Controller operation
q
Press
key twice during operation, and go to Automatic Pump Down
Mode.
w
Select "ON" by using
or
key, and press
key to start the Automatic
Pump Down.
*No displayed in LED during Automatic Pump operation
*When Automatic Pump is completed, "GOOD" is displayed. and the unit
stops.
e
Turn the UNIT ON/OFF switch off.
M
™
Controller display
COMP.
DEFROST IN RANGE
DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
Pump down set
Pump down completed
COMP.
DEFROST IN RANGE
DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
•When the pump down
operation is ended
abnormally, "E201"
(pump down malfunction)
will be displayed.
•When the pump down
operation is completed,
the unit stops state.
COMP.
DEFROST IN RANGE
DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
Pump down operation
Press
key to start
pump down
Fig. 2
OFF
LED
LCD
P DOWN
ON
P DOWN
P DOWN
GOOD
P DOWN
After the automatic pump down operation, conduct the following jobs.
q
Replacement of drier
As soon as the automatic pump down operation is complete, replace the drier in order to prevent
air from entering the drier inlet/outlet piping. (Refer to 4.2.7 for detail.)
w
Recovery of refrigerant
Conduct the automatic pump down operation in advance and, then, recover the refrigerant.
(Refer to 4.1.4
s
,
d
for more detail.)
e
Refrigerant charge
Operate Automatic pump down when the specific refrigerant amount can not be charged due to
the pressure balance.
(Refer to 4.1.4
f
for more detail.)
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