Mitsubishi Electric Mr.Slim PUZ-HA30NHA2 Service Manual page 15

9-3. INDOOR – OUTDOOR CONNECTING CABLE
Outdoor power supply
Indoor unit-Outdoor unit
The Max. cable length may vary depending on the condition of installation, humidity or materials, etc.
Indoor/Outdoor separate
power supply
Indoor unit-Outdoor unit
The optional indoor power supply terminal kit is necessary.
Be sure to connect the indoor-outdoor connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient
insulation to ground or a poor electrical contact at the intermediate connection point.
9-4. 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 1.25mm
2
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
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.
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 grounding 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 1 circuit.
To avoid communication errors caused by noise, make sure to observe the single spot grounding method described in the
installation manual.
Max. 45m, 147ft
3 AWG15(polar)
[AWG16] shield wire (CVVS, CPEVS) for the transmission wire. Transmission signals may not be
Refrigerant
address 00
M-NET
address 01
A-control
remote
controller
×
Bad example (Multi spot grounding of shield wire)
Central Power
remote supply
controller appliance
M-NET transmission wire
Good example 1 (Single spot grounding of shield wire)
Central Power
remote supply
controller appliance
M-NET transmission wire
Good example 2 (Single spot grounding of shield wire)
Central Power
remote supply
controller appliance
M-NET transmission wire
Wire No. Size
Max. 50m, 164ft
3
3 AWG13(polar)
Wire No. Size
Max. 120m, 393ft
2 Min. AWG22
Refrigerant
address 00
M-NET
address 02
A-control A-control
remote remote
controller controller
M-NET type M-NET type
outdoor unit outdoor unit
M-NET type M-NET type
outdoor unit outdoor unit
M-NET type M-NET type
outdoor unit outdoor unit
15
Max. 80m, 262ft
AWG13(polar) and S3 separated
Refrigerant
address 00
M-NET
address 03
M-NET type
outdoor unit
M-NET type
outdoor unit
M-NET type
outdoor unit