Mitsubishi Electric MXZ-8C48NAHZ Mode D'emploi 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
• Types of transmission cables: Shielding wire CVVS or CPEVS or MVVS
• Cable diameter: More than 1.25 mm
• Maximum wiring length: Within 200 m
2. M-NET Remote control cables
Kind of remote control cable Shielding wire (2-core) CVVS, CPEVS or MVVS.
Cable diameter 0.5 to 1.25 mm
When 10 m [32 ft] is exceeded, use cable with
the same specifications as transmission line
Remarks
wiring.
* Connected with simple remote controller.
[1] Basic systems
OC
BC (5-branch type)
A B C
IC IC IC IC
RC RC
R R
C C
[2] Standard systems
2-1 Only 3-branch type
OC
BC (3-branch type)
A B C
IC IC IC
R R R
C C C
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
2
2 [AWG 20 to AWG 16]*
OC: Outdoor unit
BC: Branch box
IC: Indoor unit
RC: Remote controller
(3-branch type)
BC
D E A B C
IC IC IC IC
R R R R
C C C C
2-2 Only 5-branch type
OC
BC (5-branch type)
A B C
IC IC IC
R R R
C C C
7.2. Control box and connecting position of wiring
(Fig. 7-1)
1. Connect the branch box transmission line to transmission terminal block (TB3),
or connect the wiring between outdoor units or the wiring with the centralized
control system to the centralized control terminal block (TB7).
When using shielded wiring, connect shield ground of the branch box transmis-
sion line to the screw (E or F) and connect shield ground of the line between
outdoor units and the central control system transmission line to the shield (S)
terminal of the centralized control terminal block (TB7) shield (S) terminal. In
addition, in the case of outdoor units whose power supply connector CN41 has
been replaced by CN40, the shield terminal (S) of terminal block (TB7) of the
centralized control system should also be connected to the screw (E or F) using
attached 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 indoor unit terminal block, branch box terminal
block or centralized control terminal block could be damaged.
3. MA Remote control cables
Kind of remote control cable
Cable diameter
Remarks
* Connected with simple remote controller.
2 Wiring examples
• Controller name, symbol and allowable number of controllers.
Name
Outdoor unit controller
Indoor unit controller
Remote controller
OC
BC
A B
IC IC
RC RC
2-3 2-branch boxes (3-branch type)
BC
D E A
IC IC IC
R R R
C C C
Sheathed 2-core cable (unshielded) CVV
0.3 to 1.25 mm 2 (0.75 to 1.25 mm
Within 200 m
Symbol Allowable number of controllers
OC –
MXZ-4C36 2 to 4 units per 1 OC
IC MXZ-5C42 2 to 5 units per 1 OC
MXZ-8C48 2 to 8 units per 1 OC
RC MA Maximum of 2 per group
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
IC IC
R R
C C
OC
(3-branch type)
(3-branch type) BC
B C A B
IC IC IC IC
R R R R
C C C C
240 V.
~
2 )*
C
IC
R
C
C
IC
R
C
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