Setup For The Unit Selected As The Header Unit; Connection Change Of The Communication Line - Toshiba Super MMU-AP0091H Service Manual

[Setup for the unit selected as the header unit]

6. Match the setup of SW13 and SW14 on the interface P.C. board with SW setup of the unit with trouble.
(Refrigerant system address setup)
7. Turn on Bit 2 of SW09 on the interface P .C. board. (Setup not to detect the indoor capacity over)
8. Match the setup of SW30 Bit 1 and 2 on the interface P.C. board with SW setup of the unit with trouble.
(Setup for end terminal resistance of communication)
Set SW13 and SW14 to same values
as those of the unit with trouble.

[Connection change of the communication line]

9. Change the communication line between outdoor and indoor from [U1, U2] terminal of the header unit with trouble to
[U1/U2] of the unit selected as the header unit.
10. If a central control device is connected, connect the communication line [U3/U4] of the central control system to the
communication line [U3/U4] terminal of the unit selected as the header unit, and connect a relay connector between
[U1/U2] and [U3/U4] terminals.
Header unit with trouble
Communication line between
outdoor units (U5/U6)
Change the connection of communication
line between indoor and outdoor from the
unit with trouble to the terminals (U1/U2)
of the unit selected as the header unit.
11. Turn on the power supplies of each outdoor unit.
Turn on the main power supplies of all the units other than the unit with trouble. As for power supply of the unit with
trouble, follow the procedure below.
Leave the main power supply of the unit with trouble as it is.
<In case of trouble on the compressor or electric parts system (Compressor, electric system parts, I/F P .C.
board, IPDU P.C. board)> Keep OFF for the main power supply of the unit.
< In case of trouble on the refrigerant circuit parts system (Pressure sensor, temperature sensor, refrigerat
circuit parts, fan system parts)> Turn on the main power supply to protect the compressor. (Case heater ON)
(Although [E19] (Outdoor header unit quantity error) is displayed on 7-segment display after turning on the
power supply of the unit, it is not a problem because it is only interruption of communication with the
header unit.)
Then all the backup setup for the header unit has finished. Check the operation.
6
Outdoor interface P.C. board of the unit selected as the header unit
7
Turn on Bit 2 of
SW09.
Outdoor unit selected as the header unit
Central control system communication line (U3/U4 terminals)
Communication line between indoor and outdoor units (U1/U2 terminals)
9
8
Set Bit 1, 2 of SW30 to
same values as those of the
unit with trouble.
10
When a central control device is connected, change the
connection of communication line of the central control
system from the unit with trouble to the terminals
(U1/U2) of the unit selected as the header unit.
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