Wiring Of Main Power Supply And Equipment Capacity - Mitsubishi Electric MXZ-8C48NA Manuel D'installation

7. Electrical work
7.4. Branch box/outdoor wire connection and outdoor power supply cord connection (Fig. 7-2)
Warning:
• Be sure to attach the terminal block covers/panel of the outdoor unit securely. If it is not attached correctly, it could result in a fire or an electric shock due to
dust, water, etc.
• Be sure to connect the power supply cords and the connecting wires for the indoor units, outdoor units, and branch boxes directly to the units (no intermedi-
ate connections).
Intermediate connections can lead to communication errors if water enters the cords or wires and causes insufficient insulation to ground or a poor electrical
contact at the intermediate connection point.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cords and wires.)
Caution:
• Be careful not to make mis-wiring.
• Firmly tighten the terminal screws to prevent them from loosening.
• After tightening, pull the wires lightly to confirm that they not move.
• If the connecting wire is incorrectly connected to the terminal block, the unit does not operate normally.
• Connect wire from the branch box correctly to the terminal block.
• For future servicing, give extra length to connecting wire.
OC
(51)
L
TB3 1
TB7
M1 M2 S M1 M2 S
L
3
L
2
OC
(53)
TB7
L
4
TB3
M1 M2 S M1 M2 S
Power Supply
Unit
M1 M2 S
DC24V
L
System
5
controller
M1 M2 S
A : Shielded wire
( ) : Address example
Fig. 7-2

7.5. Wiring of main power supply and equipment capacity

Schematic Drawing of Wiring (Example) (Fig. 7-3)
<When Power Is Supplied from the Outdoor Unit>
~ 08/30 V, 60 Hz
<When Power Is Supplied Separately>
~ 08/30 V, 60 Hz
TB3A TB3A TB15
Branch Box
1 A
S1 S1 IC
MA
2 B
S2 S2 (01)
S3 S3
TB5 TB3B TB3A TB15
A
M1 S1 S1 IC 1
MA
S2 2 B
M2 S2 (02)
S3
S S3
TB3C TB15
TB3A
S1 S1 IC 1 A
MA
S2
S2 2 B
(03)
S3
S3
(01)
TB3D TB3A
S1 S1 IC
RC
S2 S2
(04)
S3 S3
TB3E
TB3A
S1 S1 IC
S2 RC
S2
(05)
S3
S3
TB3A TB3A
Branch Box TB15
S1
S1 IC 1 A
MA
S2
S2 2 B
(06)
S3
S3
TB5 TB3B TB3A
(06)
M1 S1 S1 IC
RC
M2 S2 S2
(07)
S3 S3
S
TB3C TB3A
S1
S1 IC
S2 RC
S2
(08)
S3
S3
L1/L2 B1/B2
L1/L2
GR
GR
L1/L2
GR
L1/L2
GR
IMPORTANT
Make sure that the current leakage breaker is one compatible with higher
harmonics.
Always use a current leakage breaker that is compatible with higher harmon-
ics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of
inverter.
Longest length via outdoor units:
L + L + L + L + L 500 m (1640 ft.) (1.25 mm
1 2 3 4 5
Longest transmission cable length
L + L , L , L + L , L 200 m (656 ft.) (1.25 mm
1 2 3 3 4 5
S1/S2/S3
S1/S2/S3
S1/S2/S3
A Switch (Breakers for Wiring and Current Leakage)
S1/S2/S3
B Outdoor Unit
S1/S2/S3
C Branch Box
D Indoor Unit
S1/S2/S3
~ 08/30 V, 60 Hz
Fig. 7-3
Loosen terminal screw.
Terminal
Lead wire
block
Connection details
or more)
2
or more)
2
S1/S2/S3
L1/L2
S1/S2/S3
GR
S1/S2/S3
S1/S2/S3
L1/L2
S1/S2/S3
GR
S1/S2/S3
13