Control Box And Connecting Position Of Wiring; Wiring Transmission Cables - Mitsubishi Electric CITY MULTI PURY-P72TJMU-A Installation Manual

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

pushing 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

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 Terminal) 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

automatically identifi ed. They are identifi ed 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

control, 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

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 fi re.

[Fig. 11.2.1]

A

Power supply terminal block

Terminal block for indoor –

(TB1)

Control box

L1 L2 L3

C

A Power source

C Ground screw

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

•

Maximum wiring length: Within 200 m [656 ft]

•

Maximum length of transmission lines for centralized control and indoor/outdoor 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 2-core cable (unshielded) CVV

0.3 to 1.25 mm

Cable diameter

(0.75 to 1.25 mm

When 10 m [32 ft] is exceeded, use cable

Remarks

with the same specifi cations as 1. Wiring

transmission cables.

•

MA Remote Controller

Kind of remote control cable

Sheathed 2-core cable (unshielded) CVV

0.3 to 1.25 mm

Cable diameter

(0.75 to 1.25 mm

Remarks

Within 200 m [656 ft]

*

Connected with simple remote controller.

) on the outdoor units. Connect

in addition to the above.

B

Terminal block for

outdoor transmission line

centralized control

(TB3)

(TB7)

B Transmission line

2

[AWG16]

2

[AWG 22 to 16]

2

[AWG 18 to 16])*

2

[AWG 22 to 16]

2

[AWG 18 to 16])*

[Fig. 11.2.2]

A

B

C

A Cable strap

C Transmission cable

•

When using wire size AWG 14, AWG 12, or AWG 10, be sure to use

knockout hole 2.

•

When using wire size AWG 8 or AWG 6, be sure to use knockout hole 4.

•

When using wire size AWG 4, AWG 3, or AWG 2 be sure to use knockout

hole 3.

•

When using wire size AWG

3

/

, AWG

0

hole 5.

•

If there are any gaps around the wires, please be sure to fi ll these in with a

suitable material.

2 Conduit tube installation

•

Open 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 animals entering the unit.

•

When taking the conduit tube out from the bottom part of the unit, caulk

around the tube opening to prevent water penetration.

5

4

3

2

1

B Power source cable

2

/

, or AWG 0, be sure to use knockout

0

17