Types And Maximum Allowable Length Of Cables - Mitsubishi Electric e Series Service Handbook

[ II Restrictions ]

[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 unit as required.
4) Run the cable from the electric box of the 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 units that
belong to different refrigerant systems. The use of a multiple-core cable may result in signal transmission errors and malfunc-
tions.
unit
MA
MB
unit
MA
MB
(2) Control wiring
Different types of control wiring are used for different systems.

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.
HWE1417B
unit
2-core 2-core
MA
MB
shielded cable shielded cable
unit
2-core 2-core
MA
MB
shielded cable shielded cable
unit
MA
MB
MA
MB
- 14 -
unit
multiple-
MA
core cable
MB
MA
MB
GB