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6. Electrical work
c
b
a
a 4 × 10 tapping screws
d Terminal block for indoor and outdoor units connector
b Electrical equipment cover
e Grounding cable connector
c Wiring bands
f Bushing (for the wire hole)
Fig. 6-1
6.1.1. Indoor unit power supplied from outdoor unit
The following connection patterns are available.
The outdoor unit power supply patterns vary on models.
* Affix a label A that is included with the manuals near each wiring diagram for the indoor and outdoor units.
Indoor unit-Outdoor unit
Wiring Wire
No. × size
Indoor unit-Outdoor unit earth
(mm
2
)
Indoor unit earth
Indoor unit (Heater) L-N
Circuit
Indoor unit-Outdoor unit S1-S2
rating
Indoor unit-Outdoor unit S2-S3
*1. Max. 45 m
If 2.5 mm
used, Max. 50 m
2
If 2.5 mm
used and S3 separated, Max. 80 m
2
*2. The figures are NOT always against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are not electrically insulated by the transformer or other device.
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and indoor unit/outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC
57)
3. Install an earth longer than other cables.
4. Installation must be comply with the electrical wiring rule.
e
d
f
3 × 1.5 (polar)
1 × Min. 1.5
1 × Min. 1.5
–
AC 230 V
DC24 V
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6.1. Electric wiring (Fig. 6-1)
1. Remove the tapping screws a and then remove the electrical equipment cover
b.
2. Connect the electric wires securely to the corresponding terminals.
3. Fasten the connecting wiring with the bands c.
• Always ground (the ground wire diameter must be 1.6 mm or more).
• If the wires contact the pipes, condensation may drip onto them. Make sure that
the wires are properly routed.
• Fasten the wires to the electrical equipment box using the wiring bands c for tensile
force.
• After finishing this work, always reassemble the unit.
• For instructions on how to reinstall the air intake grill, see page 6.
Warning:
Never splice the power cable or the indoor-outdoor connection cable, otherwise
it may result in a smoke, a fire or communication failure.
1:1 System
*1
*1
*2
*2
*2
A Outdoor unit power supply
B Earth leakage breaker
C Wiring circuit breaker or isolating switch
D Outdoor unit
E Indoor unit/outdoor unit connecting cords
F Controller
G Indoor unit
7
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