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RECOMMENDED M-NET WIRING PROCEDURE
Installation of the M-Net is an essential part of any City Multi installation. The wiring itself is simple but there are a number of
basic rules that must be followed to avoid communication problems within the system.
ALWAYS FOLLOW THE PIPING AND WIRING SCHEMATICS
• There are two separate M-Net control daisy chains in most City Multi installations:
1. The first M-Net starts from TB3 on the first outdoor unit, it is 24-30VDC and daisy chains between outdoor units, branch
controller and indoor units within that system. Star point connections are not acceptable except when wiring in a sub BC
and must have only one star point connection leading to the sub BC (as shown on the piping and wiring schematic).
2. The second M-Net starts from TB7 on the first outdoor unit, it is 22-28VDC and daisy chains from system/central
controllers and all other outdoor units on all systems that are connected to the central controller. Star point connections
are not acceptable.
• Each M-Net shield must be earthed in one place only. Multiple earths can cause the shield to act like an aerial, causing
communication problems.
• M-Net wiring must be kept separate from other wiring to avoid induced noise.
M-Net Wiring
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