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9. Electrical work
Fig. 9-1
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Fig. 9-2
Fig. 9-3
Fig. 9-4
► Cautions for electrical work.
Warning:
• Always use dedicated circuits with breakers, and at the rated voltage.
Power supply circuits with insufficient capacity, and bad workmanship dur-
ing installation, may result in electric shock or fire.
• Always ensure that electrical wiring inlets are sealed when the branch box
is installed outdoors.
Rainwater on the terminal blocks may result in fire or malfunction.
Caution:
• Be sure to establish an earth. Do not earth the unit to a utility pipe,
arrester, or telephone earth.
Incomplete earth may cause electrical shock. A high surge current from
lightning or other sources may cause damage to the air conditioner.
• Use the specified electrical wiring and ensure that it is connected properly,
and that it is not under tension.
Failure to follow these requirements may result in broken wiring, heating,
or fire.
► Wiring connecting branch box and outdoor unit, and branch box and in-
door units, functions as both power supply and signal cable. Connect this
wiring in accordance with the terminal block numbers to ensure correct
polarity.
► Ensure that the appropriate refrigerant piping and electrical wiring are
connected to each indoor unit. Incorrect wiring will interfere with the cor-
rect operation of the unit.
► Connect refrigerant pipes and connection wires to the appropriate ports
marked with matching alphabets (Ex. A, B, C, D, E) on this unit.
► Always fix each ground wire separately with a ground screw.
► To prevent that wiring installed in the ceiling is chewed by rats etc., it
should be installed in wiring conduit.
1. Remove the screws in the cover. (Fig. 9-1)
. Remove the cover.
3. Pass the wiring into the branch box. (Fig. 9-)
4. Fix each wire in place with a wiring clamp. (Fig. 9-3)
5. Firmly connect each wire to the appropriate terminal block. (Fig. 9-3)
6. Replace the cover.
7. When the branch box is installed outdoors, ensure that the wiring inlets are
sealed with putty to prevent entry of rainwater. (Fig. 9-)
A Electric cover
B 3-Bush
C Seal
D Wiring
E BC controller
F Band
G Terminal block: TBB <To outdoor unit>
H Terminal block: TB3A-TB3E <To indoor unit>
9.1. When using wiring conduit (Fig. 9-4)
Replace the horizontal cover when the wiring conduit has been fixed in place.
A Cover
B Wiring conduit
C Washer
D Nut
E Wiring conduit
Wiring conduit of up to 1" OD may be used.
(1) When using 1" OD wiring conduit, remove the bush and fix to the branch box.
Remove the horizontal cover while fixing to the branch box.
*
() When using wiring conduit of 3/4" OD or smaller, notch the bush and insert the
wiring conduit approximately 100 mm into the branch box.
* Replace the horizontal cover when the wiring conduit has been fixed in place.
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