27-EN 28-EN
– 14 –
EN
q Power supply
Power supply 220V ~, 50Hz
Power supply switch / circuit breaker or power supply wiring / fuse rating for indoor units should be selected by the
accumulated total current values of the indoor units.
Power supply wiring Below 50 m 2.5 mm²
Control wiring, Central controller wiring
y 2-core with polarity wires are used for the Control wiring between indoor unit and outdoor unit and Central
controller wiring.
y To prevent noise trouble, use 2-core shield wire.
y The length of the communication line means the total length of the inter-unit wire length between indoor and
outdoor units added with the central control system wire length.
q Communication line
Uv line and Uc line (L2, L3, L4)
(2-core shield wire, non-polarity)
Wire size :
0.5 mm
2
(Up to 500 m)
0.75 to 1.25 mm
2
(Up to 1000 m)
Uh line (L1)
(2-core shield wire, non-polarity)
Wire size :
0.75 to 1.25 mm
2
(Up to 1000 m)
2.0 mm
2
(Up to 2000 m)
y U (v, h, c) line means of control wiring.
Uv line : Between indoor and outdoor units.
Uh line : Central control line.
Uc line : Between outdoor and outdoor units.
y Uv line and Uc line are independent from another refrigerant line. Total length of Uv and Uc lines
(L3+L4) in each refrigerant line is up to 1000 m.
[Uh line]
L1 = Up to 2000 m
[Uv and Uc line]
L2 = Up to 1000 m
(L3+L4) = Up to 1000 m
Central control device
Outdoor unit
Indoor unit
Remote controller
L 1
L 4
L 2 L 3
Uh
U3 U4
Uv
U1 U2
Uv
U1 U2
Uv
U1 U2
Uc
U5 U6
Uc
U5 U6
Uc
U5 U6
U3 U4
Uh
U1 U2
Uv
U1 U2
Uv
U1 U2
Uv
U1 U2
Uv
A B A B A B A B
U3 U4
Uh
U3 U4
Uh
Remote controller wiring
y 2-core with non-polarity wire is used for wiring of the remote controller wiring and group remote controllers wiring.
Remote controller wiring, remote controller inter-unit
wiring
Wire size: 0.5 mm² to 2.0 mm²
Total wire length of remote controller wiring and remote
controller inter-unit wiring = L + L1 + L2 + … Ln
In case of wired type only Up to 500 m
In case of wireless type
included
Up to 400 m
Total wire length of remote controller inter-unit wiring = L1 + L2 + … Ln Up to 200 m
CAUTION
y The remote controller wire (Communication line) and AC 220V 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.
L1
L
nL2L
Indoor unit
Remote
controller
Indoor unit Indoor unit Indoor unit
Remote
controller
wiring
Remote controller inter-unit wiring
(Max. 16 units)
Wire connection
REQUIREMENT
y Be sure to connect the wires matching the terminal numbers. Incorrect connection causes a trouble.
y Be sure to pass the wires through the bushing of wiring connection port of the indoor unit.
y Keep a margin (Approx. 100 mm) on a wire to hang down the electrical control box at servicing, etc.
y The low-voltage circuit is provided for the remote controller. (Do not connect the high-voltage circuit)
y Make a loop on the wire for margin of the length so that the electrical control box can be taken out during
servicing.
IM_1115350185.indb 14IM_1115350185.indb 14 26/6/2566 BE 14:5726/6/2566 BE 14:57
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