Service manual

110
15
Backup Operation
Emergency Operation
Outdoor backup setup 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 setup
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 P.C. 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.