Control Box And Connecting Position Of Wiring; Outdoor Unit; Wiring Transmission Cables - Mitsubishi Electric PURY-P72TJMU-A(-BS) Manuel D'installation

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

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
• 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