Mitsubishi Electric American Standard NAXMMX48A182A Serie Manuel D'installation page 11

7. Electrical work
L1 L2 GR B1 B2
M1
TB1 TB1B TB3
B
C
A
CONDUIT PLATE:
accessory
ø24 knock-out hole
(For transmission wires)
A : Power source
B : Power supply for branch box
C : Screw on the electrical component box
D : Transmission line
Fig. 7-1
7.3. Wiring transmission cables
1 Types of control cables
1. Wiring transmission cables
Kind of transmission cables Shielding wire CVVS, CPEVS or MVVS
Cable diameter More than 1.25 mm
Maximum wiring length Within 200 m [656 ft]
2. MA Remote control cables
Kind of remote control cable Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm² [AWG 22 to AWG 16] (0.75 to
Cable diameter
1.25 mm² [AWG 18 to AWG 16] )*
Remarks Within 200 m [656 ft]
* Connected with simple remote controller.
2 Wiring examples
[1] Basic systems
OC:
BC:
A-IC:
OC
MA-RC: MA remote controller
WL-RC: Wireless remote controller
BC (5-branch type)
A B C D
A-IC A-IC A-IC A-IC
MA-RC MA-RC
WL-RC WL-RC
[2] Standard systems
2-1. Only 3-branch type
OC
(3-branch type)
BC
A B C
A-IC A-IC A-IC
WL-RC WL-RC WL-RC
E
M2 S M1 M2 S
F
TB7
D
ø37 knock-out hole
(For power supply wires)
E : Screw on the electrical component box
F : Screw on the electrical component box
[AWG 16]
2
Outdoor unit
Branch box
A-Control indoor unit
BC (3-branch type)
E A B C
A-IC A-IC A-IC A-IC
WL-RC WL-RC WL-RC WL-RC
2-2. Only 5-branch type
OC
BC (5-branch type)
A B C
A-IC A-IC A-IC
WL-RC WL-RC WL-RC
7.2. Control box and connecting position of wiring
(Fig. 7-1)
1. Connect the wiring between the outdoor unit and the branch box to the trans-
mission terminal block (TB3) of the outdoor unit.
Connect the wiring between the outdoor unit and the centralized control system
to the transmission terminal block (TB7) of the outdoor unit.
When using shielded wiring, connect the ground of the shielded wiring to the
shield terminal (S) of the terminal block (TB3) or (TB7).
If the connection of the outdoor unit's transmission power supply connector
has been changed from CN41 to CN42, connect the shield terminal (S) of the
terminal block (TB7) to the screw (E or F) using the included lead wire.
2. Conduit mounting plates (ø27) are being provided. Pass the power supply and
transmission wires through the appropriate knock-out holes, then remove the
knock-out piece from the bottom of the terminal box and connect the wires.
3. Fix power source wiring to terminal box by using buffer bushing for tensile force
(PG connection or the like).
4. The terminal bed (TB1B) is for supplying power to the branch box (220
max 6A).
Caution:
Never connect the transmission line for the branch box or the central control
system transmission line to this terminal bed (TB1B). If the transmission
lines are connected, the branch box or centralized control system could be
damaged.
OC
BC
A B
A-IC A-IC
MA-RC MA-RC
2-3. 2-branch boxes (3-branch type)
D E
A-IC
A-IC A-IC
WL-RC
WL-RC WL-RC
Note:
The indoor units can be connected
to any of the 5 connectors (5-branch
type) or 3 connectors (3-branch type)
of the branch box.
(5-branch type) BC
(3-branch type)
C D E A B
A-IC A-IC
WL-RC WL-RC
OC
BC BC
(3-branch type) (3-branch type)
B C B
A A
A-IC A-IC A-IC A-IC
WL-RC WL-RC WL-RC WL-RC
240 V.
~
C
A-IC
WL-RC
C
A-IC
WL-RC
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