Appendix SiE33-102
118 General Information
7.8 Bad Examples and Good Examples in Installation
7.8.1 Example 1: Signal interference due to use of multiple core cable (all model)
Situation Although for the purposes of group control there are only 2 units per group there are transmission
malfunctions between the indoor units and the remote control and the remote control’s address display is
showing non-existent addresses such as 13 or 15.
Source of Problem
and Remedial
Action
Multiple core cable has been used for at least part of the interconnecting wiring between the remote
control and the indoor units.
This has resulted in signal interference leading to a transmission malfunction.
The multiple core cable was replaced by twin core cable and the fault disappeared.
Main Points Although twin core cable had been run from each unit, multiple core cable was used on the way.
In schools, etc., because remote controls are often installed in a single first floor control room, it is
easier to use a multi-core cable.
Signal interference can result in non-existent addresses appearing on the display.
Si33-102.book Page 118 Tuesday, June 26, 2001 3:18 PM
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