Mitsubishi Electric MXZ-8A140VA Manuel D'installation page 12

7. Electrical work
A
B
D
E
Fig. 7-1
7.2. Branch box/outdoor wire connection and outdoor power supply cord connection
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.
<Example> (In case of 2-branch boxes)
Outdoor unit
(A) (A)
L
E
N
Circuit
(C)
breaker
S1
(B)
S2
S3
(C)
Fig. 7-2
12
L N S1 S2 S3
C
#
Branch box 1
(5-branch type)
Indoor unit
TB3A
(D)
S1 S1
S2 S2
S3 S3
TB2B TB3B
(D)
S1 S1 S1
S2 S2 S2
S3 S3 S3
TB3C
(D)
S1 S1
S2 S2
S3 S3
TB3D
(D)
S1 S1
S2 S2
S3 S3
TB3E
(D)
S1 S1
S2 S2
S3 S3
Indoor unit
TB3A
(D)
S1 S1
S2 S2
S3 S3
TB3B
(D)
S1 S1
TB2B
S2 S2
S1
S3 S3
S2
S3
TB3C
(D)
S1 S1
S2 S2
S3 S3
Branch box # 2
(3-branch type)
7.1. Outdoor unit (Fig. 7-1)
1 Remove the service panel.
2 Wire the cables referring to the Fig. 7-1.
A Earth terminal
B Terminal block
C Clamp
D Service panel
E Wire the cables so that they do not contact the center of the service panel or the gas valve.
7.3. External wiring procedure (Fig. 7-2)
The power supply work is needed only to the outdoor unit. The power supply to the
branch box or indoor unit is conducted through wiring.
Therefore, the power supply work can be carried out at just one spot of the outdoor
A ROOM
unit. It will contribute to simplify the work and save costs.
E Power supply
single phase AC220/230/240 V, 50 Hz
AC220 V, 60 Hz
Max. Permissive System Impedance 0.22(Ω)
B ROOM
Note:
1 Power supply input: Outdoor unit only.
Connect the lines (C), (D) in accordance with the terminal block names to
C ROOM
ensure correct polarity.
Wire diameter
(A) Main (B) Earth line
power line
D ROOM
6.0 mm 2 6.0 mm 2
When using twisted wire for the wiring, the use of round terminal is required.
E ROOM
*1. A breaker with at least 3 mm contact separation in each pole shall be provided. Use non-fuse
breaker (NF) or earth leakage breaker (NV).
*2. Max. 45 m ("Outdoor unit - Branch box
If 2.5 mm 2 used, Max. 55 m.
Notes: 1. Wiring size must comply with the applicable local and national code.
F ROOM
2. Power supply cords and Indoor unit/branch box/outdoor unit con-
necting cords shall not be lighter than polychloroprene sheathed flex-
ible cord. (Design 60245 IEC 57)
3. Install an earth line longer than power cables.
G ROOM
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 har-
monics as this unit is equipped with an inverter.
H ROOM
The use of an inadequate breaker can cause the incorrect operation of in-
verter.
Loosen terminal screw.
Terminal
Lead wire
block
Connection details
Breaker *1
(C) Signal line (D) Signal line Interrupting
current
1.5 mm 2 1.5 mm 2 40 A
*2
# 1" plus "Branch box # 1 - Branch box
Performance
characteristic
40A, 30 mA
for 0.1 sec.
or less
# 2").