Toshiba MMU-P0121H Service Manual page 140

A-3) 10 minutes after the system had been activated, close the gas pipe service valve of the failed outdoor unit
fully.
A-4) For the outdoor unit operating in reclaim mode, execute the following operations.
1) Select an outdoor unit having the lowest unit No. (Usually, inverter unit) as "Outdoor unit to adjust
pressure".
2) Close fully service valves of the balancing pipes on the other outdoor units than the outdoor unit to
adjust pressure and the failed outdoor unit.
* NOTE : Open service valves of the balancing pipe of outdoor unit selected for pressure adjustment and the
failed outdoor unit fully.
* Outdoor unit No.
When SW01, SW02, and SW03 are set to [No.1], No. displayed on 7 segment is the outdoor unit
No. (Ex. [U.][# ][ ][ ] : # mark is the unit No.)
A-5) For the outdoor unit selected to pressure adjustment, execute the following operations.
1) Set the rotary switches on the interface P.C. board to the following numbers.
The presently operating low-pressure pressure data (MPa) is displayed.
n SW03 [No.2]/SW02 [No.2]/Sw01 [No.1]
n 7 segment display : [L ][
2) Observing the low pressure data, close service valve of the gas pipe gradually to adjust it to approxi-
mately 0.12MPa. (7 segment display : [L ][0.][1 ][2 ])
3) Compare data with the pressure data of the failed outdoor unit.
4) After the pressure data displayed on two outdoor units is almost the same value, operate the units for a
while, and then close service valve of the gas pipe fully.
5) When the service valve is closed fully, shift to the failed outdoor unit.
A-6) The outdoor unit selected for pressure adjustment stops automatically due to low pressure cut, etc. When
the compressor has stopped, close immediately the service valve of balancing pipe of the failed outdoor
unit fully.
A-7) Turn off the power supply of all the outdoor units. Reclaim operation is complete.
A-8) Recover the remained 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-9) The refrigerant recovery work is finished.
<Work procedure (B)>
[In case that backup operation has been executed for fault of outdoor unit]
B-1) Turn on the power supply of all the outdoor units, and keep the system in stop status (Indoor unit stop).
If insulation of the compressor is insufficient, remove lead wire of the compressor before turning on the
power supply.
B-2) For the failed outdoor unit, execute the operations in Work procedure A-2, from 1) to 4).
During set up of backup, the system cannot automatically activate. Execute operation in item B-3).
*
.][ ][ ] ( : Value of Ps pressure sensor)
* * * *
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