Toshiba A90-0132, Service Manual

Page: 125 / 176

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15
Back-up operation
Emergency operation
Outdoor back-up set-up in cooling season (simple setting method)
Outline
When either inverter unit or fixed-speed unit fails during cooling season, this function is used to perform emergency
operation quickly.
When the interface or electric circuit system fails, emergency operation by this set-up cannot be performed.
In this
case, refer to “When outdoor unit has failed” section.
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 outdoor unit.
(Even if the failed outdoor unit is the inverter unit or fixed-speed unit, the following works are common specifications.)
1)
Set
DIP SW06/Bit 1 and Bit 2 on the interface PC board to ON.
2) If refrigerant leakage occurred on PMVB, close the service valve of the liquid pipe fully. (Fully close by turning
clockwise)
(3)
Turn on power source of each outdoor unit.
If the fault is a compressor insulation error, etc., disconnect the lead wire of the compressor previously before work.
(4) Emergency process is complete. The operation then starts by a command from the indoor unit.