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[ II Restrictions ]
- 18 -
HWE09080 GB
[2] Types and Maximum allowable Length of Cables
1. Wiring work
(1) Notes
1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man-
ual.
2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference.
(Do not put the control cable and power supply cable in the same conduit tube.)
3) Provide grounding for the heat source unit as required.
4) Run the cable from the electric box of the indoor or heat source unit in such way that the box is accessible for servicing.
5) Do not connect power supply wiring to the terminal block for transmission line. Doing so will damage the electronic compo-
nents on the terminal block.
6) Use 2-core shielded cables as transmission cables.
Use a separate 2-core control cable for each refrigerant system. Do not use a single multiple-core cable to connect indoor
units that belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and
malfunctions.
(2) Control wiring
Different types of control wiring are used for different systems.
Refer to section "[5] An Example of a System to which an MA Remote Controller is connected - [7] An Example of a System
to which both MA Remote Controller and ME Remote Controller are 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
Cable type
Facility
type
All facility types
Type Shielded cable CVVS, CPEVS, MVVS
Number of
cores
2-core cable
Cable size Larger than 1.25mm
2
[AWG16]
Maximum transmission
line distance between the
heat source unit and the
farthest indoor unit
200 m [656ft] max.
Maximum transmission
line distance for central-
ized control and Indoor-
heat source transmission
line (Maximum line dis-
tance via heat source unit)
500 m [1640ft] max.
*The maximum overall line length from the power supply unit on the transmission lines for
centralized control to each heat source unit or to the system controller is 200m [656ft] max.
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB
3
TB
7
TB3: Terminal block for indoor-heat source transmission line TB7: Terminal block for centralized control
multiple-core cable
BC Controller
Indoor unit
Remote Controller
Remote Controller
2-core shielded cable
2-core shielded cable
Heat source unit
BC Controller
Indoor unit
Heat source unit