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10-27. Caution for Pump Down
Pump down means refrigerant gas in the system is
returned to the outdoor unit. Pump down is used
when the unit is to be moved, or before servicing the
refrigerant circuit.
CAUTION
●
This outdoor unit cannot col-
lect more than the rated refrig-
erant amount as shown by the
nameplate on the back.
●
If the amount of refrigerant is
more than that recommended,
do not conduct pump down. In
this case use another refriger-
ant collecting system.
Important Information Concerning Pump Down
Observe the following items when using pump down operation to recover refrigerant.
(1) If the length of inter-unit tubing exceeds 30 m, pump down cannot be used to recover the refrigerant. (The overload
protection device may be activated.)
In that case, use refrigerant recovery equipment to recover the refrigerant.
(2) Press and hold the “Recover refrigerant” button on the outdoor unit PCB for 1 second or longer.
• During refrigerant recovery, LED 1 blinks and LED 2 is lit.
• Close the liquid-side valve during refrigerant recovery. If the unit is operated for 10 minutes or longer with the
liquid-side valve open, operation will be stopped, although no alarm will be displayed on the remote con-
troller. If this occurs, close the valve and restart operation.
(3) When the valve service port pressure is approximately 0.1 MPa, press the S005 (Refrigerant recovery) button again
to end refrigerant recovery.
• In order to protect the compressor, do not continue operating to generate a negative pressure in the inter-
unit tubing.
Auto
address
The S005 (Refrigerant recovery) button is
located at the bottom right of the outdoor unit
PCB, as shown in the figure at left.
Refrigerant
recovery
ON
ON
(S001)
IC001
(S005)
System address
(S002)
04-393 DC INV Tech p 64-110 12/13/04 11:35 AM Page 98
