Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook page 28

(2) Control wiring
Different types of control wiring are used for different systems.
Refer to section "[4] An Example of a System to which an MA Remote Controller is connected " before performing wiring
work.
[Types and maximum allowable length of cables]
Control lines are categorized into 2 types: transmission line and remote controller line. Use the appropriate type of cables
and observe the maximum allowable length specified for a given system. If a given system has a long transmission line
or if a noise source is located near the unit, place the unit away from the noise source to reduce noise interference.
1) M-NET transmission line
Facility
type
Type
Cable type
Number of
cores
Cable size
Maximum transmission
line distance between the
outdoor unit and the far-
thest indoor unit
Maximum transmission
line distance for central-
ized control and Indoor/
outdoor transmission line
(Maximum line distance
via outdoor unit)
2) Remote controller wiring
Type
Cable type Number of
cores
Cable size
Maximum overall line
length
*1 The use of cables that are smaller than 0.75mm
Shielded cable CVVS, CPEVS, MVVS
500 m max.
*The maximum overall line length from the power supply unit on the transmission lines for
centralized control to each outdoor unit or to the system controller is 200m max.
MA remote controller
VCTF, VCTFK, CVV, CVS,
VVR, VVF, VCT
2-core cable
2 *1
0.3 to 1.25mm
200 m max.
2
is recommended for easy handling.
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All facility types
2-core cable
2
Larger than 1.25mm
200 m max.
[ II Restrictions ]