Electrical Work - Mitsubishi Electric PAC-AKA51BC Installation Manual

9. Electrical work

Fig. 9-1
Fig. 9-3
Fig. 9-5
5 ft or less
Fig. 9-2
Fig. 9-4
Fig. 9-6
Fig. 9-7
Support
Fig. 9-8
► 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
during installation, may result in electric shock or fire.
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.
► 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.
► Ensure that the appropriate refrigerant piping and electrical wiring are
connected to each indoor unit. Incorrect wiring will interfere with the
correct 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.
Electric cover
A
Seal
B
Wiring
C
BC controller
D
Band
E
Terminal block: TBB <To outdoor unit> ø1.6 - ø.0 mm (AWG14 to AWG1)
F
Terminal block: TB3A-TB3E <To indoor unit> ø1.6 mm (AWG14)
G
(Fig. 9-4)
Earth Terminal <To outdoor unit>
H
Earth Terminal <For TB3A>
J
Earth Terminal <For TB3B>
K
Earth Terminal <For TB3D>
L
Earth Terminal <For TB3C>
M
Earth Terminal <For TB3E>
N
Earth Terminal <To other branch box>
O
9.1. When using wiring conduit (Fig. 9-5,6,7)
Replace the horizontal cover when the wiring conduit has been fixed in place.
Cover
A
Wiring
B
Nut 1/" (procure locally)
C
Wiring conduit (For TB3C, TB3E)
D
Wiring conduit (For TB3D, TB3B)
E
Wiring conduit (For TBB, TB3A)
F
Caution:
• When installing the conduit plate
are necessary for wiring .
B
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 BC controller due to the invasion of small creatures or insects.
(Fig. 9-6)
► 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) 5 ft or less from the branch box.
Refer to Fig. 9-8 as an example.
Conduit plate
G 2
Conduit hole
H
Conduit pipe
J
BC controller
K
-branch wiring conduit
L
(procure locally)
, cut out only the knockout holes that
2
. (Fig. 9-7)
L
with
J
7