Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1063

(b) If plural outdoor units are used
1) A maximum of 48 indoor units can be connected by using the crossover wiring method, with 2 wires for
each side of the outdoor and indoor units.
Outdoor unit
Indoor unit
2) Indoor/outdoor wiring method for multiple floors.
Outdoor
unit
3) Loop wiring is inhibited
Outdoor Outdoor
unit unit
Indoor Indoor
unit unit
(5) Remote controller wiring
(a) Wiring for controlling only one indoor unit.
X Y Z
Red White Black
X Y Z
Red White Black
Outdoor unit
A B A B
A B A B
Indoor unit
Outdoor Outdoor
unit unit
Indoor Indoor
unit unit
Indoor Indoor
unit unit
Outdoor Outdoor
unit unit
(No)
Indoor Indoor
unit unit
Indoor unit
terminal blocks
Note (1) Cables for the remote controller have polarity. Be sure
Remote controller
terminal blocks
Outdoor unit Outdoor unit
A B A B
2
Double cores 0.75 ~ 2 mm
Total length of signal wires: 1000 m or less
A B A B
Indoor unit Indoor unit
Outdoor
unit
Double cores 0.75 ~ 2 mm
Total length of signal wires: 1000 m or less
Indoor
unit
Indoor
unit
Loop wiring of signal wires is inhibiteed
Wiring at the Portion indicated by a
dotted line is inhibited.
to connect terminal blocks with the same numbers. If
mis wiring occurs, E1 is displayed and disables the
unit from operating.
FDC-HKXR
2
1061