Mitsubishi Electric American Standard NAXMMX48A182A Serie Manuel D'installation page 13

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
1
TB3
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 VAC, 60 Hz
<When Power Is Supplied Separately>
A
208/230 VAC, 60 Hz
TB3A TB TB5/TB15
Branch Box
S1 S1 1 A
A-IC
MA-RC
S2 S2 2 B
(01)
S3 S3
TB5 TB3B TB TB5/TB15
M1 S1 S1 1 A
A-IC
MA-RC
S2 S2 2 B
M2 (02)
S3 S3
S
TB3C TB TB5/TB15
S1 1
S1 A
A-IC
MA-RC
S2 2
S2 (03) B
S3
S3
(01)
TB3D TB
S1 S1
A-IC
WL-RC
S2 S2
(04)
S3 S3
TB3E TB
S1
S1 A-IC
S2 WL-RC
S2
(05)
S3
S3
Branch Box TB3A TB TB5/TB15
S1
S1 A-IC 1 A
MA-RC
S2
S2 (06) 2 B
S3 S3
TB5 TB3B TB
(06)
S1 S1 A-IC
M1
WL-RC
S2 S2
M2 (07)
S3 S3
S
TB3C TB
S1
S1 A-IC
WL-RC
S2
S2 (08)
S3
S3
B
L1/L2 B1/B2
L1/L2
GR
L1/L2
B
208/230 VAC, 60 Hz
L1/L2
GR
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 200 m (656 ft.) (1.25 mm
1 2 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 (if you use))
S1/S2/S3
D
B Outdoor Unit
S1/S2/S3
C Branch Box
D
D A-Control indoor unit
S1/S2/S3
E Pull Box
E
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
[AWG 16] or more)
2
[AWG 16] or more)
2
C
S1/S2/S3
D D
L1/L2
S1/S2/S3
D
D
S1/S2/S3
D
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