[Wiring changes to communication line]
(9) Redirect the indoor-outdoor communication line connected to the failed header unit [U1/U2] to the unit selected
as the header
unit [U1/U2].
(10)If a central control device is connected, connect the central control communication line [U3/U4] to the
communication line terminal of the unit selected as the new header unit [U3/U4], and connect up the tie
connector between the [U1/U2] and [U3/U4] terminals.
1234
1234
1234
1234
1234
1234
1234
1234
SW06 SW07 SW09 SW10
SW11 SW12
1234
1234
SW16 SW17
SW13 SW14
(6)
Outdoor interface P.C. board of unit selected as new header unit
(7)
Turn on Bit 2 of SW09.
Set SW13 and SW14
identically to failed header unit.
(8)
Set Bits 1 and 2 of SW30
identically to failed header unit.
− 220 −
[Selection of new header unit]
(5) Select a new header unit from the follower units on the basis of the following criteria:
• If only one follower unit is connected, select it as the header unit.
[Setup of new header unit]
(6) Set SW13 and SW14 on the interface P.C. board same as the setting of failed header unit (refrigerant line
address setting).
(7) Turn on Bit 2
of SW09 on the interface P.C. board. (Setting to prevent connected indoor unit capacity over
trouble
. (E16))
(8) Set Bits 1 and 2 of SW30 on the interface P.C. board same as that of the failed header unit (terminator
resistance setting).
Outdoor-outdoor communication line(U5/U6)
Central control communication line
(U3/U4 terminal)
Indoor-outdo
or communication line
(U1/U2 term
inal)
(9)
Redirect the indoor-outdoor communication
line from failed header unit to unit selected
as header unit [U1/U2].
(10)
If central control device is connected, redirect central
control communication line from failed header unit to
unit selected as new header unit [U3/U4].
Failed header unit
Unit selected as new header unit
(previously follower unit No.1)
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