NET Wiring Method | Mitsubishi Electronics PUZ-A30NHA2, PUY-A36NHA2

8-4. M-NET WIRING METHOD

(Points to notice)

(1)Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 5cm. Do not put them in the same conduit tube.

(2)Terminal block (TB7) for transmission wires should never be connected to 208/230V power supply. If it is connected, electronic parts on M-NET P.C. board may be burnt out.

(3)Use 2-core x 1.25mm2 [AWG16] shield wire (CVVS, CPEVS) for the transmission wire. Transmission signals may not be sent or received normally if different types of transmission wires are put together in the same multi-conductor cable. Never do this because this may cause a malfunction.

Group remote controller

Power supply unit for transmission wire

Refrigerant address 00

M-NET address 01

Refrigerant address 00

M-NET address 02

Refrigerant address 00

M-NET address 03

A-control	A-control	A-control
remote	remote	remote
controller	controller	controller

It would be ok if M-NET wire (non-polar, 2-cores) is arranged in addition to the wiring for A-control.

(4)Ground only one of any appliances through M-NET transmission wire (shield wire). Communication error may occur due to the influence of electromagnetic noise.

“Ed” error will appear on the LED display of outdoor unit. “0403” error will appear on the central-control remote controller.

✕Bad example (Multi spot grounding of shield wire)

Central	Power	M-NET type	M-NET type
remote	supply	M-NET type	M-NET type
remote	supply	outdoor unit	outdoor unit
controller	appliance	outdoor unit	outdoor unit
controller	appliance

M-NET type outdoor unit

M-NET transmission wire

Good example 1 (Single spot grounding of shield wire)
Central	Power	M-NET type	M-NET type	M-NET type
remote	supply
		outdoor unit	outdoor unit	outdoor unit
controller	appliance

M-NET transmission wire

Good example 2 (Single spot grounding of shield wire)
Central	Power	M-NET type	M-NET type	M-NET type
remote	supply
		outdoor unit	outdoor unit	outdoor unit
controller	appliance

M-NET transmission wire

If there are more than 2 grounding spots on the shield wire, noise may enter into the shield wire because the ground wire and shield wire form one circuit and the electric potential difference occurs due to the impedance difference among ground- ing spots. In case of single spot grounding, noise does not enter into the shield wire because the ground wire and shield wire do not form one circuit.

To avoid communication errors caused by noise, make sure to observe the single spot grounding method described in the installation manual.

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