When Back-Up Operation Has Been Utilised - Toshiba HFCR407C Service Manual

A-3) 10 minutes after the system has been activated, close the gas pipe and balance pipe service valves of the failed
outdoor unit fully.
A-4) Turn off the power source for all the outdoor units.
A-5) Recover the remaining gas in the failed outdoor unit using a refrigerant recovery device.
(Calculate the recovered refrigerant, and be sure to add the calculated amount of refrigerant after repair has
completed.)
A-6) The refrigerant recovery work is finished.
Work procedure (B)

When back-up operation has been utilised.

B-1) Turn on the power source of all the outdoor units, and keep the system in stop status (Indoor unit stop).
If insulation resistance of the failed outdoor unit compressor is insufficient, remove the compressor cable before
turning on the power source.
B-2) For the failed outdoor unit, execute the operations in Work procedure A-2, from steps 1) to 4).
* During set-up of back-up, the system can automatically activate. Execute operation in item B-3).
B-3) For the outdoor unit selected as the master unit (usually the Inverter unit), execute the following operations.
1) Set the rotary switches on the interface PC board to the following numbers:
• SW03 [No.1]/SW02 [No.5]/SW01 [No.2] (Trial cooling mode)
• 7 segment display: [C .][ ][ ][ ]
2) Hold the push-switch SW04 on the interface PC board for 5 seconds or more.
The system starts operation in trial cooling mode.
• 7 segment display: [C ][ ][– ][C ]
* To interrupt the work, turn off the power source of all the outdoor units or push the push-switch SW05 on the
interface PC board.
3) Push the switch SW04 on the interface PC board to set the mode to Ps pressure data display mode.
* Every push of the switch SW04 for approx. 2 seconds, display content changes as follows:
Initial display
[r.] [d ] [ 1] [ 1]
B-4) 10 minutes after the system has started the operation in trial cooling mode, close the gas pipe and balance pipe
service valves of the failed outdoor unit fully.
B-5) Complete steps A4 to A6 as explained previously.
19
Replacing the compressor
Refrigerant recovery method
Pd pressure: [Pd]
[H ] [* .] [* ] [* ]
TE temperature: [tE]
[ ] [* ] [* ] [* .]
Ps pressure: [Ps]
[L] [* .] [* ] [* ]
TS temperature: [tS]
[ ] [* ] [* ] [* .]
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TD1 temperature: [td1]
[ ] [* ] [* ] [* .]
TD2 temperature: [td2]
[ ] [* ] [* ] [* .]