11.Wiring (For details, refer to the installation manual of each indoor/outdoor unit and controller.)
11.1. Caution | [Fig. 11.2.2] |
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1Follow ordinance of your governmental organization for technical standard re- lated to electrical equipment, wiring regulations and guidance of each electric power company.
2Wiring 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.)
3Be sure to provide designated grounding work to the outdoor unit.
4Give 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.
5Never connect the main power source to terminal block of transmission line. If
connected, electrical parts will burn out.
A
2
3
1
6Use
7Only the transmission line specified should be connected to the terminal block for outdoor unit transmission.
Erroneous connection does not allow the system to operate.
8When 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
9Grouping is set by operating the remote controller.
11.2. Control box and connecting position of wiring
1Outdoor 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,
*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
*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 
. 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]
A | B |
|
Power supply terminal block | Terminal block for indoor – | Terminal block for |
(TB1) | outdoor transmission line | centralized control |
Control box | (TB3) | (TB7) |
| ||
L1 L2 L3 |
|
|
| C |
|
A Power source | B Transmission line | |
CGround screw
4 5
B C
A Cable strap | B Power source line |
CTransmission 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.
2Conduit 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
1Types of control cables
1. Wiring transmission cables
•Types of transmission cables: Shielding wire CVVS, CPEVS or MVVS
•Cable diameter: More than 1.25 mm2 [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 | Sheathed |
Cable diameter | 0.3 to 1.25 mm2 [AWG 22 to 16] (0.75 to |
| 1.25 mm2 [AWG 18 to 16])* |
Remarks | When 10 m [32 ft] is exceeded, use cable with |
| the same specifications as 1. Wiring |
| transmission cables. |
|
|
• MA Remote Controller |
|
|
|
Kind of remote control cable | Sheathed |
Cable diameter | 0.3 to 1.25 mm2 [AWG 22 to 16] (0.75 to |
| 1.25 mm2 [AWG 18 to 16] )* |
Remarks | Within 200 m [656 ft] |
|
|
*Connected with simple remote controller.
GB
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