1
3
.
P.C. BOARD EXCHANGE PROCEDURES
[Requirement when replacing the service indoor P.C. board assembly]
In the non-volatile memory (Hereinafter said EEPROM, IC10) installed on the indoor P.C. board before
replacement, the type and capacity code exclusive to the corresponding model have been stored at shipment
from the factory and the important setup data such as refrigerant line /indoor unit /group address in
(AUTO/MANUAL) mode have been stored at installation.
Replace the service indoor P.C. board assembly according to the following procedure.
After replacement, make sure that the indoor unit address is set correctly and also the refrigerant cycle is
working correctly by test operation.
<Replacement procedure>
CASE 1
Before replacement, power of the indoor unit can be turned on and the setup data can be readout
by the wired remote controller.
Read EEPROM data (see
H
1
in Page 139, 140)
ò
Replace service P.C. board & power ON (see
H
2
in Page 140, 141)
ò
Write the read data to EEPROM (see
H
3
in Page 142)
ò
Power reset
(If in group operation, reset the power for all indoor units which are connected to the remote controller.)
CASE 2
Before replacement, the setup data can not be read out by the wired remote controller.
Replace service P.C. board & power ON (see
H
2
in Page 140, 141)
ò
Write the data such as “option input selection” setup to EEPROM (see
H
3
in Page 142)
(According to the customers’ information)
ò
Power reset
H
1 Readout of the setup data from EEPROM
(Data in EEPROM contents, which have been changed at the local site, are read out together with data in
EEPROM set at shipment from the factory.)
1. Push
SET
,
CL
and
TEST
buttons of the remote controller at the same time for 4 seconds or more.
1
(Corresponded with No. in Remote controller as shown below picture)
∗
When group operation, the header indoor unit address is displayed at the first time. In this time, the CODE
No. (DN)
is displayed. The fan of the second indoor unit operates and the flap starts swinging if any.
Model type
MML-AP
✻✻✻
4NH
1
series
P.C. board model
MCC-1510
Label display on P.C. board
WP-025
111
