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6. Electrical work
6.5. Wiring of main power supply and equipment capacity
Schematic Drawing of Wiring: When Not Using a Branch box (Example) (Fig. 6-3)
A
3~ 208/230 V AC
60 Hz
Schematic Drawing of Wiring Connection with Branch box (Example) (Fig. 6-4)
<When power to Branch box is supplied from the outdoor unit>
3~ 208/230 V 60 Hz
<When power is supplied separately>
3~ 208/230 V 60 Hz
Thickness of Wire for Main Power Supply and On/Off Capacities
<When power is supplied separately>
Model
MXZ-SM72TAM
Outdoor Unit
MXZ-SM96TAM
MXZ-SM120TAM
Branch Box
<When power is supplied from the outdoor unit>
en
Model
MXZ-SM72TAM
Outdoor Unit
MXZ-SM96TAM
MXZ-SM120TAM
Branch Box
*1 Please follow applicable federal, state, or local codes to prevent potential leakage/electric shock. Or install a ground fault interrupt for the prevention of leakage and
electric shock.
IMPORTANT
If a current leakage breaker is used, it should be compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker
can cause the incorrect operation of inverter.
*2. Use copper supply wires. Use the electric wires over the rating voltage 300 V.
*3. Although the conduit size is larger than the size specified for the wire thickness according to UL standards, use a conduit size of 1-1/4 inch.
29
B
B
A
B1/B2
L1/L2/L3
B
A
L1/L2/L3
Minimum Wire Thickness
(mm
[AWG])
Power Supply
2
Main Cable*2
8.4 [AWG8]
208/230 V AC,
8.4 [AWG8]
60 Hz
13.3 [AWG6] 13.3 [AWG6] 1-1/4*3
Minimum Wire Thickness
(mm
[AWG])
2
Power Supply
Main Cable*2
21.2 [AWG4] 21.2 [AWG4]
208/230 V AC,
21.2 [AWG4] 21.2 [AWG4]
60 Hz
21.2 [AWG4] 21.2 [AWG4]
A
208/230 V AC
60 Hz
E
Fig. 6-3
C
S1/S2/S3
D
L1/L2
S1/S2/S3
D
S1/S2/S3
D
C
S1/S2/S3
D
L1/L2
S1/S2/S3
D
S1/S2/S3
Fig. 6-4
A
208/230 V 60 Hz
Fig. 6-5
Conduit
Breaker for
Breaker for Current Leakage
size
Wiring*1
Ground
8.4 [AWG8]
1-1/4*3
40 A
40 A 30 mA 0.1 sec. or less
8.4 [AWG8]
1-1/4*3
40 A
40 A 30 mA 0.1 sec. or less
50 A
50 A 30 mA 0.1 sec. or less
Refer to Installation Manual of Branch Box.
Conduit
Breaker for
Breaker for Current Leakage
size
Wiring*1
Ground
1-1/4
60 A
60 A 30 mA 0.1 sec. or less
1-1/4
60 A
60 A 30 mA 0.1 sec. or less
1-1/4
70 A
70 A 30 mA 0.1 sec. or less
Refer to Installation Manual of Branch Box.
A Switch (Breakers for Wiring and Current Leakage (if you use))
B Outdoor Unit
C Branch Box
D A-Control indoor unit (M, S, P series indoor unit)
E CITY MULTI series indoor unit
F Pull Box
F
E
E
C
S1/S2/S3
D
L1/L2
S1/S2/S3
D
S1/S2/S3
F
C
C
S1/S2/S3
S1/S2/S3
D
L1/L2
L1/L2
S1/S2/S3
S1/S2/S3
D
S1/S2/S3
S1/S2/S3
D
Minimum circuit
(if you use)
ampacity
32
32
47
Minimum circuit
(if you use)
ampacity
50
50
65
E
D
D
Maximum rating of over
current protector device
58
58
84
Maximum rating of over
current protector device
76
76
102
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