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Allowable Length Of M-net Transmission Lines - Mitsubishi Electric PAC-SC50KUA Installation Manual

Building air conditioning control system.
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CAUTION
• Both of PAC-SC50KUA and Outdoor unit can supply DC power to the M-NET transmission line.
Set the outdoor unit central control system transmission line power supply to the factory setting CN41 (no supply). For further
details, refer to the installation manual of the outdoor unit. Not doing so may cause unit failure or fire.
NOTE
The shied wire of M-NET transmission line shall be grounded by one point similar to earthing method.
The shield wire shall be connected to the S terminal of only one unit on the common transmission line.
After connection for the each cable, fasten each cable with the cable fixture.

5 Allowable length of M-NET transmission lines

• Maximum length of M-NET transmission
• Maximum power feeding length
NOTE
* 1: Not including the remote control cables up to 10m in length. If the remote control cable exceeds 10m, the excess must be
added to the total length in order to avoid exceeding the maximum length.
Example
Central
controller
DC Power
supply
(DC12V)
Length: max.10m
M-NET transmission line
(Centralized control line)
M-NET transmission line
(Indoor control line)
1) Maximum length of M-NET transmission
1 L2+L3+L4+r1+r2+r3 (r4)
2 L2+L3+L4+r1+r5
3 L2+L3+L5+r6+r7 (r8)
4r3 (r4) +r2+r1+L4+L5+r6+r7 (r8) 500m
5 r5+r1+L4+L5+r6+r7 (r8)
2) Maximum power feeding length for the indoor control line
1 r1+r2+r3 (r4) 200m
2 r1+r5
200m
3) Maximum power feeding length for the centralized control line
1 L1 +L2
200m
2 L1 +L3+L4 (L5) 200m
NOTE
If the remote control cable (r4,r8) do not exceed 10m in length, the length for r4,r8 may not consider to the total length.
500m*1
200m*1
L2
L3
L4
Outdoor
unit
L1
Power
supply
unit
L5
Outdoor
500m
500m
500m
500m
r 2
r 1
Indoor
Indoor
r 4
Remote controller
Indoor
Indoor
r6
Indoor
Indoor
r8
Remote controller
– 6 –
r3
Indoor
r5
Indoor
r7
Indoor

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