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11. Wiring (For details, refer to the installation manual of each indoor/outdoor unit and controller.)
11.1. Caution
1 Follow ordinance of your governmental organization for technical standard re-
lated to electrical equipment, wiring regulations and guidance of each electric
power company.
2 Wiring for control (hereinafter referred to as transmission line) shall be (5 cm
or more [2 in or more]) apart from power source wiring so that it is not influenced
by electric noise from power source wiring. (Do not insert transmission line
and power source wire in the same conduit.)
3 Be sure to provide designated grounding work to the outdoor unit.
4 Give some allowance to wiring for the electrical part box on the indoor and
outdoor units, because these boxes are sometimes removed at the time of
service work.
5 Never connect the main power source to terminal block of transmission line. If
connected, electrical parts will burn out.
6 Use 2-core shield cable for the transmission line. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor trans-
mitting and receiving will cause erroneous operations.
7 Only the transmission line specified should be connected to the terminal block
for outdoor unit transmission.
Erroneous connection does not allow the system to operate.
8 When connecting a System Controller to outdoor units or performing a group
operation of indoor units that are connected to different outdoor units, a
transmission line for centralized control is required. When using a transmission
line for centralized control, connect the transmission line (non-polar 2 core
wire) to all TB7 terminals between all outdoor units.
9 Grouping is set by operating the remote controller.
11.2.
Control box and connecting position of wiring
1 Outdoor unit
1. Remove the front panel of the control box by removing the 4 screws and push-
ing it up a little before pulling it out.
2. Connect the indoor - outdoor transmission line to the terminal block (TB3) for
the indoor - outdoor transmission line.
If multiple outdoor units are connected in the same refrigerant system, daisy-
chain TB3 (M1, M2, ground terminal
) on the outdoor units. Connect the
indoor - outdoor transmission line for the outdoor units to TB3 (M1, M2, ground
terminal
) of only one of the outdoor units.
3. Connect the transmission lines for centralized control (between the centralized
control system and the outdoor unit of different refrigerant systems) to the
terminal block for centralized control (TB7). If the multiple outdoor units are
connected to the same refrigerant system, daisy-chain TB7 (M1, M2, S Termi-
nal) on the outdoor units in the same refrigerant system. (*1)
*1: If TB7 on the outdoor unit in the same refrigerant system is not daisy-
chained, connect the transmission line for centralized control to TB7 on
the OC (*2). If the OC is out of order, or if the centralized control is being
conducted during the power supply shut-off, daisy-chain TB7 on the OC
and OS. (In the case that the outdoor unit whose power supply connector
CN41 on the control board has been replaced with CN40 is out of order or
the power is shut-off, centralized control will not be conducted even when
TB7 is daisy-chained.)
*2: OC and OS of the outdoor units in the same refrigerant system are auto-
matically identified. They are identified as OC and OS in descending order
of capacity. (If the capacity is the same, they will be in ascending order of
their address number.)
4. In the case of indoor-outdoor transmission line, connect the shield ground to
the ground terminal
. In the case of transmission lines for centralized con-
trol, connect it to the shield terminal (S) on the terminal block for centralized
control (TB7). Furthermore, in the case of the outdoor units whose power
supply connector CN41 is replaced with CN40, short circuit the shield terminal
(S) and the ground terminal
in addition to the above.
5. Fix the connected wires securely in place with the cable strap at the bottom of
the terminal block. External force applied to the terminal block may damage it
and may cause a short circuit, ground fault, or a fire.
[Fig. 11.2.1]
Terminal block for indoor –
outdoor transmission line
(TB3)
Terminal block for
centralized control
(TB7)
Power supply terminal block
(TB1)
Control box
C
A
B
L1 L2 L3
A Power source B Transmission line
C Ground screw
[Fig. 11.2.2]
A
B
C
1
2
3
4
5
A Cable strap B Power source line
C Transmission line
•
When using wire size AWG 6, be sure to use knockout hole 4.
• When using wire size AWG 4, AWG 3, AWG 2, or AWG 1, be sure to use
knockout hole 2.
• When using wire size AWG 0, AWG
0
/
2,
or AWG
0
/
3
, be sure to use knockout
hole 5.
• If there are any gaps around the wires, please be sure to fill these in with a
suitable material.
2 Conduit tube installation
• Close by hammering the knockout holes for the conduit tube located on the
base and the bottom part of the front panel.
• When installing the conduit tube directly through the knockout holes, remove
the burr and protect the tube with masking tape.
• Use the conduit tube to narrow down the opening if there is a possibility of
small animal’s entering the unit.
11.3. Wiring transmission cables
1 Types of control cables
1. Wiring transmission cables
•Types of transmission cables: Shielding wire CVVS, CPEVS or MVVS
• Cable diameter: More than 1.25 mm
2
[AWG 16]
• Maximum wiring length: Within 200 m [656 ft]
• Maximum length of transmission lines for centralized control and indoor/out-
door transmission lines (Maximum length via outdoor units): 500 m [1640 ft]
MAX
The maximum length of the wiring between power supply unit for transmission
lines (on the transmission lines for centralized control) and each outdoor unit
and system controller is 200 m [656 ft].
2. Remote control cables
• M-NET Remote Controller
Kind of remote control cable
Cable diameter
Remarks
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
2
[AWG 22 to 16]
(0.75 to
1.25 mm
2
[AWG 18 to 16])*
When 10 m [32 ft] is exceeded, use cable with
the same specifications as 1. Wiring
transmission cables.
* Connected with simple remote controller.
Kind of remote control cable
Cable diameter
Remarks
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm
2
[AWG 22 to 16]
(0.75 to
1.25 mm
2
[AWG 18 to 16]
)*
Within 200 m
[656 ft]
• MA Remote Controller