Wiring Of Main Power Supply And Equipment Capacity - Mitsubishi Electric MXZ-8C48NA Para El Instalador

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 intermediate
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
A
M1 M2 S M1 M2 S
Power Supply
A
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>
A
~ 208/230 V, 60 Hz
<When Power Is Supplied Separately>
A
~ 208/230 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
B
L1/L2 B1/B2
L1/L2
GR
L1/L2
B
~ 208/230 V, 60 Hz
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
C
S1/S2/S3
D
S1/S2/S3
D
S1/S2/S3
D
C
A Switch (Breakers for Wiring and Current Leakage)
S1/S2/S3
D
B Outdoor Unit
S1/S2/S3
C Branch Box
D
D Indoor Unit
S1/S2/S3
E Pull Box
A
C
S1/S2/S3
L1/L2
S1/S2/S3
S1/S2/S3
Fig. 7-3
Loosen terminal screw.
Terminal
Lead wire
block
Connection details
or more)
2
or more)
2
E
C
S1/S2/S3
D D
L1/L2
S1/S2/S3
D
D
S1/S2/S3
D
13