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Wire connection
REQUIREMENT
Be sure to connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
Be sure to pass the wires through the bushing of wiring connection port of the indoor unit.
The low-voltage circuit is provided for the remote controller. (Do not connect the high-voltage circuit)
Make a loop on the wire for margin of the length so that the electrical control box can be taken out during
servicing.
1. Remove the cover of the electrical control box by taking off the mounting screw and pushing the hooking
section. (The cover of the electrical control box remains hanged to the hinge.)
2. Connect the power supply wire and remote controller wire to the terminal block of the electrical control box.
3. Tighten the screws of the terminal block, and fix the wires with cord clamp attached to the electrical control box.
(Do not apply tension to the connecting section of the terminal block.)
4. Mount the cover of the electrical control box without pinching wires.
(Mount the cover after wiring on the ceiling panel.)
Louver connector
Hinge
Terminal cover
Screw
Hanger
* Make sure insert the terminal cover on the top of hanger.
Power supply wire port
Indoor - Outdoor
inter-unit wire /
Remote controller
wire port
31-EN
Indoor - Outdoor inter-unit
Cord clamp
Electric control
wire / Remote controller
box cover
terminal block
Uv(U1) Uv(U2) A B
Grounding wire
Screw
Power supply wire
L1 L2
Power supply terminal block
* Cable clamp can be attached on left side.
Wire
Cable clamping
Specification
type
Cabtyre
3-core stranded
cable
wire AWG14
Cabtyre
4-core stranded
cable
wire AWG16
Remote controller wiring
Strip of
Wiring diagram
2-core with non-polarity wire is used for the remote controller wiring and group remote controllers wiring.
Remote controller wiring, remote controller inter-unit wiring
Total wire length of remote controller wiring and
remote controller inter-unit wiring = L + L1 + L2 + ... Ln
Max. length of each remote control wiring between indoor units = L1, L2, ... , Ln
NOTE
Use copper supply wire.
(L1)(L2)
Use UL wire rated 600V for the power supply.
Use UL wire rated 300V for the remote control wires and control wires.
CAUTION
The remote controller wire (Communication line) and AC 208/230V wires cannot be parallel to contact each
other and cannot be stored in the same conduits. If doing so, a trouble may be caused on the control
system due to noise or other factor.
If U series models (TU2C-Link) are combined with models other than U series (TCC-Link), the wiring
specifications and maximum number of connectable indoor units will be changed. Pay attentions to their
communication specifications when carrying out the installation, maintenance, or repair. For its details, refer to
the "Communication line" in Electrical connection.
(4 mm))
Indoor unit
Remote
controller
wiring
position
Side D
Side C
Max. number of connectable indoor units, and communication type
Outdoor unit
Indoor unit
Remote controller
C
o
m
m
u
n
c i
t a
o i
n
y t
p
e
Max. number of connectable
units
*
: Other than U series
– 16 –
Terminal block for
remote controller
Terminal block
wiring of indoor unit
Remote controller wire
(Locally procured)
Wire size: AWG20
In case of one remote
controller
In case of two remote
controller
Indoor unit
Indoor unit
L
L1
L2
Remote
Remote controller inter-unit wiring
For number of max. connectable units,
controller
refer to the following table.
Unit type
U series
U series U series U series
U series
U series
*
*
U series
U series
*
*
T
U
2
C
L -
n i
k
1
6
Remote
controller
unit
Indoor unit
Ln
EN
*
*
*
*
U series U series
*
*
FR
U series
U series
*
*
T
C
C
L -
n i
k
ES
8
32-EN
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