Toshiba MMY-MAP0804FT7(Z), Service Manual, Page: 250 / 333

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9-3. Backup Setup for Outdoor Unit
Outline
In this model, setup of the backup operation is available in either the header unit or the follower unit in a
situation where the outdoor units are defective. In a system in which two or more outdoor units are connected,
carry out the backup operation on the outdoor unit if the error modes described below occur.
• Compressor error (Rare short error or when one compressor cannot operate, etc.)
• Pressure sensor (Pd, Ps) / Temperature sensor (TD1, TD2, TD3, TS1, TS2, TE1, TE2, TK1, TK2, TK3, TK4,
TK5, TL) error
Note only one outdoor unit within a given system can be subjected to the backup procedure.
Procedure
(1) Turn off the main power supplies to all the units connected to the system.
[Set up procedure for the malfunctioning outdoor unit]
(The following work is common to the header unit and follower units in the system.)
(2) Set the DIP switches of SW06, provided on the interface P.C. board of the outdoor unit with the faulty
compressor, as shown in the table below.
Three-compressor model
SW06
SW06
Bit 1 Bit 2 Bit 3 Bit 4
Bit 1 Bit 2 Bit 3 Bit 4
Factory default setting
Outdoor unit backup
Two-compressor model
Factory default setting
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF Outdoor unit backup
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
SW06 SW07 SW09 SW10
SW11 SW12
1 2 3 4 1 2 3 4
SW16 SW17
SW13 SW14
(3) When there is leakage of outdoor PMV (does not close) or a trouble, close the liquid valve service valves fully.
(4) Turn on the power supply to all the units connected to the system.
When a trouble due to insufficient insulation, etc. occurred, remove in advance lead wire of the compressor.
This is the end of compressor backup operation setting.
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