Toshiba A90-0132, Service Manual

Page: 123 / 176

123
15
Back-up operation
Emergency operation
Fault in fixed-speed unit (Back-up 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 power source 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 power source OFF.
5) [In case of fault of other cycle part system]
a.
Remove BUS-1 communication connector (BLU)[CN601] on the interface PC board.
b. Works to the failed fixed-speed unit are complete.
c.
Then, turn on the power source to protect the compressor.
(Turn on crank case heater)
(3) Perform the following works
for the inverter unit.
1) Set
DIP SW 07/Bit 3 on the interface PC board to ON.
(Set-up to correct oil recovery capacity)
2)
Turn on the power source of each outdoor unit.
3)
Set operation permission of outdoor unit back-up operation (alarm clear set-up).
a. Set rotary switches on the interface PC board, SW03 to [No.1]/SW02 to [No.1]/SW01 to [No.1].
b. After [U.][1 ][8 ][d ] is displayed on the 7 segment LED of the interface PC board, set SW03 to [No.1]/SW02 to
[No.16]/SW01 to [No.2].
c. After [E.][r ][ ][ ] is displayed on the 7 segment LED of the interface PC board, keep 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.
d. Set SW03 to [No.1]/SW02 to [No.1]/SW01 to [No.1].
If [U.][1 ][ ][ ] is displayed on the 7 segment LED, it is normal.
(4) Then, emergency process is complete. The operation then starts by a command from the indoor unit.