2-2
Design of VRF SYSTEMS
1
2
3
4
5
6
7
8
9
1. Electrical Wiring
1. Electrical Wiring
1-1. General Precautions on Wiring
1-2. Recommended Wire Length and Wire Diameter for Power Supply System
Control wiring
(C) Inter-unit control wiring
(between outdoor and indoor units)
0.75 mm² (AWG #18)
Use shielded wiring*
Max. 1,000 m
(D) Remote control wiring
0.75 mm² (AWG #18)
Max. 500 m
NOTE
* With ring-type wire terminal.
(E) Control wiring for group control
0.75 mm² (AWG #18)
Max. 200 m (Total)
Design of VRF SYSTEMS
Indoor unit
Type
(B) Power supply
Time delay fuse or
circuit capacity
2.5 mm²
Minimum 2 mm²
Max. 150 m
Max. 130 m
Max. 150 m
10 – 16 A
15 A
15 A
K1
K2
Y2
U1
10 – 16 A
Max. 130 m
F2
10 – 16 A
Max. 130 m
T2
10 – 16 A
Max. 130 m
M1
10 – 16 A
Max. 130 m
E2
10 – 16 A
Max. 30 m
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring closely
following the wiring diagram.
(2) This equipment is strongly recommended to be
installed with Earth Leakage Circuit Breaker (ELCB)
or Residual Current Device (RCD). Otherwise, it may
cause electrical shock and fire in case of equipment
breakdown or insulation breakdown.
Earth Leakage Circuit Breaker (ELCB) must be
incorporated in the fixed wiring in accordance with the
wiring regulations. The Earth Leakage Circuit Breaker
(ELCB) must be an approved 10-16 A, having a
contact separation in all poles.
(3) To prevent possible hazards from insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done in accordance with
the wiring system diagram. Wrong wiring may cause the
unit to misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be very
dangerous. The manufacturer will accept no responsibility
for any damage or misoperation that occurs as a result of
such unauthorized changes.
(7) Regulations on wire diameters differ from locality to
locality. For field wiring rules, please refer to your LOCAL
ELECTRICAL CODES before beginning.
You must ensure that installation complies with all relevant
rules and regulations.
(8) To prevent malfunction of the air conditioner caused by
electrical noise, care must be taken when wiring as follows:
The remote control wiring and the inter-unit control wiring
should be wired apart from the inter-unit power wiring.
Use shielded wires for inter-unit control wiring between units
and ground the shield on both sides.
(9) If the power supply cord of this appliance is damaged,
it must be replaced by a repair shop designated by the
manufacturer, because special-purpose tools are required.
WARNING
2-3
1
2
3
4
5
6
7
8
9
1-3. Wiring System Diagrams
(1)
Wire Diameter for Power Supply System ” for the
explanation of “B”, “C”, “D” and “E” in the above
diagram.
(2)
the 7P terminal board, so the terminal boards in your
equipment may differ from the diagram.
(3)
turning the power on.
(4)
Refer to Section “1-2. Recommended Wire Length and
The basic connection diagram of the indoor unit shows
Refrigerant Circuit (R.C.) address should be set before
Address setting can be executed by remote controller
automatically. Refer to Section 5.
(5) Regarding Type E2, the power supply is
220/230/240V ~50Hz and 220/230V ~60Hz.
U2
U1
R2
R1
L
N
R2
R1
R2
R1
R2
R1
2
1
2
1
U2
U1
L
N
U2
U1
L
N
U2
U1
L
N
2
1
2
1
2
1
D
E
C
B
L
N
L
N
L
N
L
N
2
1
B
B
B
C
D
D
C
C
Power supply
220/230/240V ~50/60Hz
Remote
controller
Remote
controller
Remote
controller
WHT
BLK
WHT
BLK
WHT
BLK
Power supply
220/230/240V ~50/60Hz
Power supply
220/230/240V ~50/60Hz
Power supply
220/230/240V ~50/60Hz
Ground
Ground
Ground
Ground
Ground
Ground
To outdoor unit
Outdoor unit
Ground
Ground
Ground
Ground
Ground
Indoor unit
(No. 1)
Indoor unit
(No. 2)
Indoor unit
(No. n)
Indoor unit
(No. 3)
Group control:
L
N
L
N
L
N
L
N
U1 U2
5P terminal board
Power
Supply
Inter-unit
Control
Wiring
6P terminal board
6P terminal board
6P terminal board
Type U1
Type F2
Type Y2
Terminal Board
Power
Supply
Inter-unit
Control Wiring
Remote
Control Wiring
Fig. 2-1
6P terminal board
6P terminal board
Type K1
Type K2
Type T2
Power
Supply
Power
Supply
Remote
Control
Wiring
Remote
Control
Wiring
Inter-unit
Control
Wiring
Inter-unit
Control
Wiring
Power
Supply
Remote
Control
Wiring
Inter-unit
Control
Wiring
Power
Supply
Remote
Control
Wiring
Inter-unit
Control
Wiring
Power
Supply
Remote
Control
Wiring
Inter-unit
Control
Wiring
L
N
U1 U2 R1 R2
7P terminal board
Type E2
Design of VRF SYSTEMS
1. Electrical Wiring
U1
U2
R1
R2
U1 U2 R1 R2
U1 U2 R1 R2
L
N
U1 U2 R1 R2
Type M1
Power
Supply
Remote
Control
Wiring
Inter-unit
Control
Wiring
TD831172-03 VRF SYS INDOOR.indb 2
2015/05/25 17:57:59
