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12. P.C. BOARD EXCHANGE PROCEDURES
12-1. Indoor Unit
12-1-1. Exchange of P.C. Board for Indoor Service
Part code
4316V437
Model type
MMU-AP
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2WH series
P.C. board model
MCC-1402
Requirement at exchange of P.C. board assembly for indoor service
Before exchange, in the fixed memory (hereinafter EEPROM, IC10) installed on the indoor P.C. board,
the type exclusive to the model and the capacity code are stored at shipment from the factory. The
important setup data such as line/indoor/group address which are set up (Auto/Manual) or high ceiling
exchange setup at installation time, respectively.
Proceed with exchange of P.C. board assembly for indoor service in the following procedure.
After exchange work, check again the setup for indoor unit No. or group header/follower units to
confirm whether the setup contents are correct or not, and then check also the refrigerant circuit
system by a test operation, etc.
<Exchange procedure>
Method 1
Before exchange, it is possible to turn on power of the indoor unit and read out the
setup contents from the wired remote controller.
Readout of EEPROM data:
Procedure 1
ò
Exchange of P.C. board for service & power ON:
Procedure 2
ò
Writing-in of the readout EEPROM data:
Procedure 3
ò
Power supply reset
(All the indoor units connected to the remote controller in case of group operation control)
