Toshiba MMY-MAP1006FT8(J)P-E Service Manual page 243

[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.
• If two follower units are connected, select the follower unit that is nearest to the failed 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 interface P.C. board of unit selected as new header unit
Turn on Bit 2 of SW09.
SW06
1 2 3 4 1 2 3 4
SW11
1 2 3 4 1 2 3 4
SW16
1 2 3 4 1 2 3 4
[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.
Failed header unit
Redirect the indoor-outdoor communication
line from failed header unit to unit selected
as header unit [U1/U2].
(7)
SW07 SW09
1 2 3 4 1 2 3 4
SW12 SW13
1 2 3 4 1 2 3 4
SW17
(6)
Set SW13 and SW14
identically to failed header unit.
Unit selected as new header unit
(previously follower unit No.1)
Outdoor-outdoor communication line(U5/U6)
(9)
SW10
SW14
Set Bits 1 and 2 of SW30
identically to failed header unit.
Central control communication line
(U3/U4 terminal)
Indoor-outdo or communication line
(U1/U2 term inal)
If central control device is connected, redirect central
control communication line from failed header unit to
unit selected as new header unit [U3/U4].
− 242 −
(8)
Follower unit No.2
(10)