Automatic Pump Down - Daikin LXE10E-A Service Manual

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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
Automatic pump down setup
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
M
①
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) 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)
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
Pump down is
started when the
key is pressed.
② ③
② Alter the display from
"OFF" to "ON" with the
"△" key.
③ Fix the display with the
enter key.
4-3
Automatic pump
down operation
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
Automatic pump down
completed
COMP. DEFROST IN RANGE DE-HUMID.
SUPPLY
RETURN
ALARM
R.H.
④
I/O
④ Turn the Switch OFF.
⑤ Deactivate the circuit breaker.
・The unit is stopped
when pumpdown is
finished.
・When abnormal
finish error occurs,
E201 (faulty pump down)
is displayed.