Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 900

FDC-HKX
(5) Remote controller wiring
(a) Wiring for controlling only one indoor unit.
X Y Z
Red White Black
X Y Z
Red White Black
(b) When controlling plural units.
1) Use the same procedure shown in the drawing above for the wiring of the power supply, both indoor and outdoor units
and remote controller
When the wiring length for the remote controller exceeds 100 m, use the wiring procedure shown in the drawing below.
2) Connect each of the indoor units for group controlling (3 cables)
a) Connect the cables to the terminal blocks of X, Y, and Z for the indoor unit remote controller. Since the cables have
polarity, be sure to connect them to terminal blocks with the same numbers.
b) Use cables of more than 0.5 mm2 (Flexible and easily moved)
c) The total length of cables for crossover connection and the remote controller should be less than 600 m.
Note (1) Refer to the wire size chart on page 851 for any wiring exceeding 100 meters.
3) When there is more than one outdoor unit, they can be controlled by one remote controller.
4) One remote controller is capable of controlling up to 16 units in group.
Note (1) Use shielded cables, when wiring in parallel with cables for other power supply or when there is a possibility of
being affected by outer noise such as noise from a high-frequency unit.
(c) Settings for main and secondary units when multiple remote controllers are used.
Up to two remote controllers can be used for each indoor
unit (or each group of indoor units).
1) There are two methods for arranging this. One
method is to take a remote control connection wire
(3-strand) from the indoor unit for the secondary
remote control. The other method is to use a jumper
wire from the main remote control.
2) Set the remote control switch for the secondary unit (SW4) to
secondary unit. (It was set to main unit a the factory.)
Note (1) The remote controller sensor setting is only enabled on the main remote controller.
Be sure to position the main remote controller in a location where it can detect
the room temperature.
898
Indoor unit
Note (1) Cables for the remote controller have polarity. Be sure
terminal blocks
Remote controller
terminal blocks
Outdoor unit
Unit address
A B
No.01
Indoor unit
(Outdoor unit
address No.01)
(Indoor unit
A B
address No.00)
Indoor unit
(Outdoor unit
address No.01)
(Indoor unit
A B
address No.02)
Indoor unit
(Outdoor unit
address No.01)
(Indoor unit
A B
address No.03)
Remote controller
to connect terminal blocks with the same numbers. If
mis wiring occurs, E1 is displayed and disables the
unit from operating.
Outdoor unit
Unit address
A B
No.02
Indoor unit
(Outdoor unit
address No.02)
(Indoor unit
A B
address No.04)
Indoor unit
(Outdoor unit
address No.02)
(Indoor unit
A B
address No.05)
Indoor unit
(Outdoor unit
address No.02)
(Indoor unit
A B
address No.006
Indoor unit
X Y
X Y
Remote
control
Remote control signal wire (has
Z polarity)
Match X Y and Z and connect.
Z X Y Z
SW4 SW4
Remote
control
Main Secondary