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9. REPLACEMENT OF SERVICE P.C. BOARD
9-1. 4-Way Air Discharge Cassette Type / Under Ceiling Type
<Note: when replacing the P.C. board for indoor unit servicing>
The nonvolatile memory (hereafter called EEPROM) on the indoor unit P.C. board before replacement includes
the model specific type information and capacity codes as the factory-set value and the important SET DATA
which have been automatically or manually set when the indoor unit is installed, such as system/indoor/group
addresses, high ceiling select setting, etc.
When replacing the P.C. board for indoor unit servicing, follow the procedures below.
After replacement completes, confirm whether the settings are correct by checking the indoor unit No., Group
header unit/follower unit settings and perform the cooling cycle confirmation through the trial operation.
<Replacement procedures>
CASE 1
Before replacement, the indoor unit can be turned on and the SET DATA can be read out by wired
remote control operation.
EEPROM data read out
[1]
ò
Replacement of P.C. board for Indoor unit servicing and power on
[2]
ò
Writing the read out EEPROM data
[3]
ò
Power reset
(For all indoor units connected to the remote control when the group operation control is performed.)
CASE 2
The EEPROM before replacement is defective and the SET DATA cannot be read out.
EEPROM data read out
[2]
ò
Writing the SET DATA to EEPROM, such as high ceiling installation setting and
optional connection setting, etc., based on the customer information.
[3]
ò
Power reset
(For all indoor units connected to the remote control when the group operation control is performed.)