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HOW TO REPLACE SERVICE BOARD OF INDOOR UNIT (Continued)
∗∗∗∗∗
1 Reading EEPROM Data
(Read EEPROM data that was updated at site in addition to factory setting.)
1) Push
SET
,
CL
, and
TEST
on the remote controller simultaneously for 4 seconds or more.
1
(see page 62)
∗
In the group control mode, the header unit number is displayed first.
At this time, code (DN)
is displayed, and the fan of the selected indoor unit runs, its louver
swings,and the OPERATION, TIMER, and PREPARING lamps blink.
2) Each pushing of
UNIT LOUVER
indicates indoor unit number in the group sequentially.
2
Specify indoor unit number whose board is to be replaced.
3) Each pushing of TEMP.
/
buttons increments or decrements DN.
3
4) Change DN from
to
first. (Setting of filter sign ON time)
Write down the setting data displayed.
5) Change DN with TEMP.
/
buttons, and write down the setting data displayed.
6) Repeat step 5) in the same way, and write down the important setting data shown in the table (page 59).
∗
DN =
to
)>
. DN does not always shift sequentially.
7) After writing down setting data, push
TEST
to return the operation mode to normal OFF.
6
(It takes about one minute until remote controller operation is enabled.)
Essential DN codes
DN
11
12
13
14
Description
Indoor unit capacity
Refrigerant line address
Indoor unit address
Group address
(1) Indoor unit capacity is necessary for fan speed setting.
(2) If refrigerant line address, indoor unit address or group address
differs from that before replacement, the unit enters auto address
setting mode, which requires manual re-setting for group opera-
tion including twin or triple operation.
∗∗∗∗∗
2 Replacing Service Board and Power ON
1) Replace the board with a service board.
Reflect the jumper wire (cut) setting and switch setting on the board in the service board. For switch
setting and component layout, see page 63.
2) Power ON the indoor unit in either way of the following according to system configuration.
a) Single (individual) operation. Power ON the indoor unit with no operation.
i) Go to
∗
3
when auto address setting mode ends (about 5 minutes).
(Refrigerant line address=1, indoor unit address=1, and group address=0 are set automatically.)
ii) Push
SET
,
CL
, and
TEST
on the remote controller simultaneously for 4 seconds or more (
1
) to
cancel auto address setting mode, and then go to
∗
3
. (UNIT No.
is indicated.)
b) Group operation (including twin/triple/double twin)
Power ON the indoor unit whose service board is replaced in either way of the following.
i) Power ON the indoor unit only whose service board is replaced in the same way as a) i) and ii) above.
There must be remote controller connection. If not, operation
*3
is disabled.
ii) Power ON multiple indoor units including the unit whose service board is replaced.
• Twin, triple, double twin: One system only
• Group control: All indoor units
Go to *
3
when auto address setting mode ends (about 5 minutes).
∗
Header indoor unit may change depending on auto address setting.
The refrigerant line address and indoor unit address of the indoor unit whose service board is replaced are
automatically set to an address that is not used in other units.
It is recommended that you take a memo beforehand that to which refrigerant system the indoor unit belongs
and that the indoor unit is header or follower unit in the group.
