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Turn on bit 1 and bit 2 of dip SW06.
11-3. 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 situa-
tion 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, TS1, TE1, TK1, TK2, TK3, TK4, 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. Turn on both bit 1 and 2 of the SW06 on the interface P.C. board.
3. Fully close the liquid service valve when the outdoor PMV is suspected to be leaking
(i.e. when the PMV will not close fully).
4. Turn on the main power supplies of all of the units connected to the system.
If the fault is a compressor insulation error, remove the wiring to the compressor before turning the power
supply on.
After the backup set up for the outdoor unit in cooling season is complete, check the system operates.