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8. Electrical work
A
Fig. 8-1
F
E
G
D
A
Electric cover
B
Conduit plate
C
Wiring
D
Controller board
E
Terminal block: TB5 <Transmission line>
F
Terminal block: TB2B <For Power Supply /
To outdoor unitor other branch box>
G
Terminal block: TB3A-TB3E
<To indoor unit>
Fig. 8-3
D
G
E
H
F
A
Fig. 8-5
M
J
K
L
Fig. 8-6
5 ft or less
L
B
Fig. 8-2
H~O
H
Earth Terminal <Power supply>
J
Earth Terminal <To indoor unit A>
K
Earth Terminal <To indoor unit B>
L
Earth Terminal <To indoor unit C>
M
Earth Terminal <To indoor unit D>
N
Earth Terminal <To indoor unit E>
O
Earth Terminal <To other branch
box>
Fig. 8-4
G
B
C
N
Fig. 8-7
Support
Fig. 8-8
8.1. Precautions
C
Warning:
• Always use dedicated circuits with breakers, and at the rated
voltage.
Power supply circuits with insufficient capacity, and bad work-
manship during installation, may result in electric shock or fire.
• Never splice the cable, otherwise it may result in smoke, fire,
or communication failure.
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 prop-
erly, and that it is not under tension.
Failure to follow these requirements may result in broken wiring, heating,
or fire.
• Never connect the main power source to the terminal block of the trans-
mission line. If connected, electrical parts will be burnt out.
• Wiring for control (hereinafter referred to as transmission line) shall be (5
cm or more) apart from power source wiring so that it is not influenced
by electric noise from power source wiring. (Do not insert the transmis-
sion line and the power source wire in the same conduit.)
► Be sure to set the switches before turning on the breakers of the Branch
Box and the outdoor unit.
► When power is separately supplied to the branch box and the outdoor
unit, turn on the branch box first.
► Wiring connecting branch box and outdoor unit, and branch box and
indoor units, functions as both power supply and signal cable. Connect
this wiring in accordance with the terminal block numbers to ensure
correct polarity.
8.2. Electrical work procedure
► Connect refrigerant pipes and electrical wiring to the appropriate ports
marked with matching alphabets (Ex. A, B, C, D, E) on this unit. Incor-
rect wiring will interfere with the correct operation of the unit.
► First, connect the power supply cable from the outdoor 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 electric cover. (Fig. 8-1)
(2) Remove the conduit cover.
(3) Pass the wiring into the branch box through the conduit plate and fix with
the conduit plate. (Refer to 8.3.)
(4) Firmly connect each wire to the appropriate terminal block. (Fig. 8-9)
(5) Set dip sw. (Refer to 8.5.)
(6) Replace the electric cover.
8.3. When using wiring conduit (Fig. 8-5, 8-6, 8-7)
Replace the electric cover when the wiring conduit has been fixed in place.
A
Electric cover
B
Wiring
C
Nut 1/2" (procure locally)
D
Wiring conduit (For TB3A, TB3B)
E
Wiring conduit (For TB3C, TB3D)
F
Wiring conduit (For TB3E)
G
Wiring conduit (For TB2B)
Caution:
• When installing the conduit plate
are necessary for wiring
Cutting out unnecessary knockout holes may cause damage due to the in-
vasion of small creatures and the like.
• When cutting out the knockout holes on the conduit plate, beware that nei-
ther deformation nor distortion occurs on the plate.
Also, when installing the conduit plate, beware that no gap exists between
the plate and the conduit pipes or the conduit holes, otherwise it may cause
failure of the controller board due to the invasion of small creatures or in-
sects.
(Fig. 8-6)
► To divide the wirings of each terminal block into 2 branches outside the
branch box, use 2-branch wiring conduits
Caution:
To avoid excessive strain on the branch box, support the conduit pipe
one or more support(s) 1.5 m [5 ft] or less from the branch box.
Refer to Fig. 8-8 as an example.
H
Wiring conduit (For TB5B)
J
Conduit plate (3.1. Accessories No.
K
Conduit hole
L
Conduit pipe
M
Controller board
N
2-branch wiring conduit
(procure locally)
J
, cut out only the knockout holes that
B
.
. (Fig. 8-7)
N
0
)
en
L
with
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