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9. P.C. BOARD EXCHANGE PROCEDURES
Hot water module
Replacement of Hot water module P.C. boards
Points to note when replacing hot water module P.C. board assembly
The electrically erasable programmable read-only memory (hereinafter EEPROM, IC10) mounted on a P.C.
board holds important setting data, including the type and capacity codes intrinsic to the model (set at the
factory), as well as the line / indoor (including hot water module) / group addresses, and the like (during
installation, either automatically or manually). Proceed with the replacement of a P.C. board assembly in
accordance with the procedure described below.
After completion of the work, check the settings again, including the hot water module No. and group header /
follower designation, and confirm the integrity of the refrigerating cycle by conducting a test operation, etc.
<Replacement procedure>
Method 1
If it is possible to turn on the hot water module and read the setting data from the P.C. board to be replaced via
a wired remote controller -
Reading EEPROM data:
Procedure 1
Replacing P.C. board and turning on power:
Procedure 2
Writing EEPROM data in new EEPROM:
Procedure 3
Resetting power supply (applicable to all hot water module units connected to remote controller in case of
group operation)
Method 2
If it is not possible to read the setting data due to the failure of the EEPROM itself -
Replacing P.C. board and turning on power:
Procedure 2
Writing EEPROM data on basis of information supplied by customer (e.g. optional connection setting):
Procedure 3
Resetting power supply (applicable to all hot water module units connected to remote controller in case of group
operation)
Part code
Model type
P.C. board type
431-6V-529
MMW-AP
∗∗∗
1LQ series
MCC-1403
