Electrical Work; Setting Addresses And Operating Units; Test Run - Mitsubishi Electric CMB-P-V-F Installationshandbuch

5. Electrical work

s Consult all related regulations and power companies beforehand.
Warning:
Electrical work should be handled by qualified electric engineers in accord-
ance with all related regulations and attached instruction manuals. Special
circuits should also be used. If there is a lack of power capacity or a defi-
ciency in electrical work, it may cause a risk of electric shock or fire.
s Connect all wires without looseness.
• Fix power source wiring to control box by using buffer bushing for tensile force
(PG connection or the like).
[Fig. 5.0.1] (P.3)
A Control box
C ø21 hole (closed rubber bushing)
s Never connect the power cable to the terminal board for control cables.
(Otherwise it may be broken.)
s Be sure to wire between the control wire terminal boards for indoor unit,
outdoor unit and BC controller.
Transmission cables are of crossover wiring method by non-polarized 2-wires.
Use 2-core shielding cables (CVVS, CPEVS) of more than 1.25 mm
for transmission cables.

6. Setting addresses and operating units

The address switch of each BC controller is set to "000" when shipped from the
factory. Check it.
• Set the address switch to 1 + the address of the outdoor unit.
s The BC controller address should generally be set to 1 + the address of
the outdoor unit. However, if this would result in it having the same ad-
dress as another outdoor unit, set the address between 51 and 100, mak-
ing sure that it is different from the address of other controllers.
• Please refer to the outdoor unit installation manual.

7. Test run

Before getting test run checked
s After installing, piping and wiring the indoor units and BC controllers,
check to see again that there is no refrigerant leakage or no slack on
power and control cables.
s Use a 500 V megger to check that there is an insulation resistance of
Ω
more than 1.0 M between the power terminal bed and the ground. If it is
Ω
less than 1.0 M , do not get operated.
Caution:
Never measure the insulation resistance of the terminal bed for control ca-
bles.
8
B Power source wiring
D Transmission wiring
2 in diameter
The switch capacity of the main power to BC controllers and the wire size are as
follows:
Switch (A)
Molded case
Capacity Fuse
circuit breaker
15 15 20A
• For other detailed information, refer to the outdoor unit installation manual.
• Power supply cords of appliances shall not be lighter than design 245 IEC 53
or 227 IEC 53.
• A switch with at least 3 mm contact separation in each pole shall be provided
by the Air conditioner installation.
Caution:
Do not use anything other than the correct capacity fuse and breaker. Using
fuse, conductor or copper wire with too large capacity may cause a risk of
malfunction or fire.
Ensure that the outdoor units are put to the ground. Do not connect the earth
cable to any gas pipe, water pipe, lightening rod or telephone earth cable.
Incomplete grounding may cause a risk of electric shock.
Earth leakage
Wire size
breaker
20A 30mA 1.5 mm 2
0.1 s or less