Appendix Si39-303
150 General Information
7.12.7 Example 7: Transmission wiring between the cool/heat selector and
the outdoor unit is too close to a high voltage wire.
Situation
Heating is indicated despite having selected cooling with the cool/heat selector.
Cause and
Remedial Action
The transmission wiring between the cool/heat selector and the outdoor unit is too close to a high voltage
wire. An induced voltage is, therefore, being impressed on the transmission wiring which is causing a
heating/cooling malfunction in the outdoor unit PC board.
Bypassing the transmission wiring will allow the unit to function normally.
Main Points
!
Keep low and high voltage wiring away from each another.
7.12.8 Example 8: The centralized control group number cannot be set
(Inverter K Series).
Situation
An attempt was made to set the centralized control group number with the indoor unit remote controller, but
“00” cannot be selected in the field setting mode.
Cause
1. The central remote controller or unified ON/OFF controller is OFF.
2. The central remote controller or unified ON/OFF controller, or indoor unit is not wired to the centralized
control line (F1 & F2).
Remedial Action
Supply power to either the central remote controller or unified ON/OFF controller.
Wire the central remote controller or unified ON/OFF controller, or indoor unit to the centralized control
line.
Main Points
!
When communications with the central remote controller are down, “00” cannot be selected in the field
setting mode.
!
Activate power to the central remote controller, unified ON/OFF controller and indoor unit before setting
the centralized control group number.
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