141
10. P.C. BOARD EXCHANGE PROCEDURES
10-1.
4-Way Cassette type , Compact 4-Way Cassette type, Ceiling type
Points to Note When Replacing Indoor P.C. Board Assembly
The electrically erasable programmable read-only memory (hereinafter EEPROM,IC503,
or IC10) mounted on an
indoor
P.C. board holds important setting data, including the type and capacity codes intrinsic to the model (set
factory), as well as the line/indoor/group addresses, high ceiling adjustment setting and the like
(during
either automatically or manually). Proceed with the replacement of an indoor P.C. board assembly
in accordance
with the procedure described below.
After completion of the work, check the settings again, including the indoor unit 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 indoor unit 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 indoor units connected to remote controller in case of group operation)
Part code Model type P.C. board type
431-6V-447 MMU-AP
2H2UL series
1MH2UL series
1H2UL series
MCC-1570
431-6V-445
MMU-AP
MMC-AP
MCC-1402
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. high ceiling adjustment setting and
optional connection setting): Procedure 3
Resetting power supply (applicable to all indoor units connected to remote controller in case of group operation)
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installation,
at the
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