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10-1-3. Refrigerant recovery procedure B (Case that the troubled outdoor unit does not turn on)
<Outline>
If outdoor unit backup operation setting is performed, use an alternative refrigerant recovery procedure as
described below, provided that the power cannot be turned on for the troubled outdoor unit. (Refrigerant will be
recovered from the failed outdoor unit using the test cooling operation function.)
Note: If the power cannot be turned on the troubled outdoor unit, the solenoid valves and PMVs of the unit
cannot be turned on, so that it reduces the amount of recovered refrigerant compared to a standard
reclaim operation. Recover the residual gas in the unit using a refrigerant recovery device, and be sure
to measure the amount of recovered refrigerant.
<Work procedure>
[Setup of troubled outdoor unit]
(1) Connect the liquid pipe check joint and the low pressure-side check joint using a gauge manifold, and purge
the manifold of air (to recover refrigerant from the heat exchangers).
(2) Fully close the liquid pipe packed valve of the troubled outdoor unit.
(Leave the service valve of the HP/LP gas pipe and the LP gas pipe fully open.)
[Setup of unit selected as header unit (hereafter "header outdoor unit")]
(3) Set SW01/02/03 on the interface P.C. board of the header outdoor unit to 2/5/1. After [C. ] [... ... ...] is
displayed on the 7-segment display, push SW04 and hold for 5 seconds or more.
(4) After [C. ...] [... – C] is displayed on the 7-segment display, the system starts operating in the test cooling
operation mode.
(5) Set SW01/02/03 on the interface P.C. board of the header outdoor unit to 1/2/2 to have the low-pressure
sensor\ output (MPa) displayed on the 7-segment display.
(6) Approx. 20 minutes after the system starts on , fully close the HP/LP gas pipe and the LP gas pipe
service value of the failed outdoor unit.
(7) Push SW05 on the interface board to finish the reclaim operation.
(8) Turn off the power supply to all the outdoor units , and recover the residual refrigerant in the outdoor unit
using a refrigerant recovery device. Be sure to measure the amount of recovered refrigerant.
(This is necessary to determine how much additional refrigerant will be needed after the completion of the
repair.)
Header unit
(8)
Turn off the power supply to all the outdoor units ,
and recover the residual refrigerant in the outdoor
Push SW05 on the interface board
Approx. 20 minutes after the system starts up , fully close
Liquid pipe
(3) Set SW01/02/03 to 2/5/1.
[C. ] [... ... ...] is displayed.
(4) Push SW04 and hold for 5 seconds or more.
[C. ...] [... – C] is displayed.
(Test cooling operation begins).
(5) Set SW01/02/03 to 1/2/2 to have low-pressure
sensor output (MPa) displayed.
Pd→Ps→C–C
This is the end of the refrigerant recovery operation.
Set SW01/02/03 of the troubled outdoor unit and the outdoor unit for pressure adjustment back to 1/1/1.
Troubled outdoor unit
(7)
(6)
The check joint color shows below:
LP gas pipe
HP/LP gas pipe
↓
↓
Connect the check joint of liquid pipe and
the low pressure-side check joint using a
Fully close the liquid pipe service valve of the troubled
Interface P.C. board of troubled outdoor unit
CN30
CN31 CN32
SW04
SW05 SW06
D600
D601
D602 D603 D604
SW01
SW02
SW03
1
1
1
- 296 -
(1)
(2)
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Troubleshooting
