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) Access to automatic pump down operation mode
M
①②③
④
I/O
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
Automatic pump down setup
Automatic pump
down operation
Automatic pump down
completed
④ Turn the Switch OFF.
⑤
Deactivate the circuit breaker.
・When abnormal
finish error occurs,
E201 (faulty pump down)
is displayed.
・The unit is stopped
when pumpdown is
finished.
① Press the "M" key
twice while the unit is
running (press it once
during the
dehumidification
control setup). Then,
the unit enters the
pump down mode.
② Alter the display from
"OFF" to "ON" with the
"△" key.
③ Fix the display with the
enter key.
Pump down is
started when the
key is pressed.
(2) Use of automatic pumpdown
[1] Replacement of dryer
※After the automatic pumpdown operation is completed, pressure in the pipe in and out of the
dryer is slightly higher than the atmospheric pressure.
Thus, although no ambient air will not be entered in the piping, even when the dryer is replaced,
replace it quickly in a short period. (For details, see clause 4.2.6)
※Therefore, the system inside does not need to be dried with vacuum after the dryer is replaced.
[2] Recycling refrigerant
※Before recycling refrigerant, execute the automatic pump down operation.
(As for the details, see (2) of clause 4.1.4)
[3] Charging refrigerant (third step)
※ If the ambient temperature is low, and the refrigerant cannot be charged to the specified
amount because of pressure balance, execute the automatic pump down operation. (As for the
details, see (3) of clause 4.1.4)
04LXE10E-A(1-8)07.2.206:08PMページ4-3
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