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10. OUTDOOR UNIT REFRIGERANT RECOVERY METHOD
10-1. Refrigerant Recovery from Troubled Outdoor Unit (Reclaim)
This product supports refrigerant reclaim, a function which allows refrigerant to be recovered from an outdoor
unit in need of repair using a normal outdoor unit in a system featuring multiple outdoor units.
10.1.1 Note for refrigerant recovery operation
Can troubled unit energized?
10.1.2 Refrigerant recovery procedure A
(It's possible to turn on to an outdoor unit.)
Do you drive during outdoor repairs?
10.2 How to Operate System While
Troubled Outdoor Unit Being Repaired
10.3 Work procedure after Repair
10-1-1. Note for refrigerant recovery operation
When performing reclaim operation, take note of the following matters:
Note 1: The reclaim refrigerant recovery rate changes with outside temperature and other factors.
After reclaim is completed, recover any residual gas using a refrigerant recovery device, etc., and be
sure to measure the amount of recovered refrigerant. (The refrigerant recovery rate can be improved
by heating the accumulator of the outdoor unit to be repaired during reclaim operation.)
Note 2: If reclaim has been performed, the system cannot be operated until the troubled outdoor unit is
repaired.
(Continued operation would be impossible due to a refrigerant overcharge.)
Note 3: If outdoor PMV 1 happens to be unable to open or PMVs 2 and 3 happen to be unable to open, the
refrigerant in the heat exchangers cannot be recovered. In that case, recover any residual gas in the
heat exchangers using a tube piercing valve or some other tool. After a reclaim operation, do not
perform any brazing until the residual gas in the heat exchangers is recovered.
10-1-2. Refrigerant recovery procedure A (Case that the troubled outdoor unit turn on)
<Work procedure>
Turn on the power supply to the system at the source, but leave the system switched off.
If the trouble involves poor insulation of a compressor motor, remove the motor leads before the power is turned on.
[Setup of failed outdoor unit]
(1) Connect the check joint of liquid pipe and the low pressure-side check joint using a charge hose, and purge
the hose of air (to recover refrigerant from the liquid tank and heat exchangers).
(2) Fully close the liquid pipe service valve of the troubled outdoor unit.
(Leave the service valves of the gas pipe fully open.)
(3) Set SW01/02/03 on the interface P.C. board of the failed outdoor unit to 2/11/1. After [rd] [... ... ...] is
displayed on the 7-segment display, push SW04 and hold for 5 seconds or more.
START
YES
YES
- 255 -
NO
10.1.3 Refrigerant recovery procedure B
(It's impossible to turn on to an outdoor unit.)
NO
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Troubleshooting
