Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 899

(4) Indoor and outdoor signal wiring
(a) If only one Outdoor unit is used
Outdoor signal teminal block
Indoor signal terminal block
Notes (1) The indoor and outdoor signal wiring are without polarity
(2) For connection to the terminal block, use as M3.5 (5/32) round eye-let terminal is shown below.
(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.
2) Indoor/outdoor wiring method for multiple floors.
Outdoor
unit
3) Loop wiring is prohibited
Outdoor Outdoor
unit unit
Indoor
unit
A B
A B
B
A
7 mm or less
Outdoor unit Outdoor unit
A B A B
A B A B
Indoor unit Indoor unit
Outdoor Outdoor
unit unit
Indoor Indoor
unit unit
Indoor Indoor
unit unit
Outdoor Outdoor
unit unit
(No)
Indoor Indoor Indoor
unit unit unit
2
Double cores 0.75 ~ 2 mm
Total length of signal wires: 1000 m or less
A B
B B B
A A A
Outdoor unit Outdoor unit
A B A B
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 prohibited
Wiring at the Portion indicated by a
dotted line is prohibited.
FDC-HKX
A B
Either of the above wiring is correct.
2
2
897