Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 897

(2) Precaution in electric wiring.
(a) Use separate power supplies for the outdoor and indoor units respectiveliy (Standard specification)
(b) Signal wiring (for indoor and outdoor units)
• Double-core cable with a diameter 0.75 to 2 mm
• Never make the indoor and outdoor connecting signal line use "co-axial cable" or "strand" with the power
wiring for indoor and outdoor unit and other ower line.
(Never use a multiconductor wire together with power line. It may cause erroneous operation.)
• Do not connect high voltage wires 220/240 V or 380/415 V to signal wires. as these wires are DC 5V. Signal wires should be
connected so that the terminal Nos. conform with each other for between outdoor and between indoor units. However, they
will work properly if different polarities are connected.
(Connect (A) and (A), (B)and (B).)
• Do not strand or run the remote control cord with power line, electric line, etc.
• The total length of the signal wires Should be 1000m or less.
• Recommended signal wire list
No.
Vinyl cabtire round cord
1
2 Vinyl cabtire round cable
3 Control vinyl insulated, vinyl sheathed cable
4 Shielding wire
When No. 4 shielding wire is used, always ground the single wire side of the shielding wire . In addition, using the shielding
wire is helpful to prevent the incorrect connection between 5V DC and 220/240V or 380/415V AC because the
discrimination from the power supply wire is clear.
(3) Wiring system Diagram
Model FDC140type
Circuit breaker
Earth leakage
breaker
Power source (indoor unit side)
1phase 220/240V50Hz
2
should be used for the signal wires.
Name
Power source (outdoor unit side)
3phase 380/415V50Hz
Earth leakage
breaker
Circuit Breaker
Earth
Signal wire (Between indoor units)
Indoor
unit
<I> <II> <III>
remote
controller
wire
Remote controller
Symbol
VCTF double-core 0.75 to 2 mm
VCT double-core 0.75 to 2 mm
CVV double-core 0.75 to 2 mm
MVVS double-core 0.75 to 2 mm
Outdoor unit
Signal wire (Between outdoor and indoor units)
<IV> <V> <VI>
FDC-HKX
2
2
2
2
895