Toshiba MM-A0280HT Service Manual page 101

Fault in fixed-speed unit (Backup of slave outdoor unit)
Outline
When a fixed-speed unit connected to the system fails, firstly perform emergency process
according to the following work procedure, and then perform emergency operation on the
inverter unit and other fixed-speed units.
Work procedure
(1) First, turn off the source power of all the outdoor units which are connected to
the system.
(2) The following works are performed to the failed fixed-speed unit.
1) Close service valve of gas pipe fully (fully close by turning clockwise).
2) If refrigerant leakage occurs on PMVB, close service valve of the
liquid pipes.
(Fully close by turning clockwise)
3) Check service valve of the balancing pipe is open fully (fully open by turning
counterclockwise).
4) [In case of fault of compressor/fault of electric part system]
a. Works to the failed fixed-speed unit are complete.
b. Then, keep the source power OFF.
5) [In case of fault of other cycle part system]
a. Remove BUS-1 communication connector (BLU)[CN601] on the interface
b. Works to the failed fixed-speed unit are complete.
c. Then, turn on the source power to protect the compressor.
(3) Perform the following works for the inverter unit.
1) Set DIP SW 07/Bit 3 on the interface P .C. board to ON.
(Setup to correct oil recovery capacity)
2) Turn on the source power of each outdoor unit.
3) Set operation permission of outdoor unit backup operation (alarm clear setup).
a. Set rotary switches on the interface P .C. board, SW03 to [No.1]/SW02 to
b. After [U.][1 ][8 ][d ] is displayed on the 7 segment LED of the interface P .C. board,
c. After [E.][r ][ ][ ] is displayed on the 7 segment LED of the interface P .C. board, keep
d. Set SW03 to [No.1]/SW02 to [No.1]/SW01 to [No.1].
(4) Then, emergency process is complete. The operation then starts by a command from the
indoor unit.
15
Backup Operation
Emergency Operation
P .C. board.
(Turn on crank case heater)
[No.1]/SW01 to [No.1].
set SW03 to [No.1]/SW02 to [No.16]/SW01 to [No.2].
push-switch SW04 pushed for 5 seconds or more.
[E. ][r ][C ][L ] is displayed on the 7 segment LED for 5 seconds, and work is complete.
If [U.][1 ][ ][ ] is displayed on the 7 segment LED, it is normal.
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