Electrical Work; Setting Addresses And Operating Units - Mitsubishi Electric City Multi CMB-WM108V-AA Manuel D'installation

6. Electrical work

 Consult all related regulations and power companies beforehand.
Warning:
Electrical work should be handled by qualified electrical engineers in
accordance with all related regulations and attached instruction manuals.
Special circuits should also be used. If there is a lack of power capacity or a
deficiency in electrical work, it may cause a risk of electric shock or fire.
 Connect all wires securely.
• Fix power source wiring to control box by using buffer bushing for tensile force
(PG connection or the like).
[Fig. 6.0.1] (P.5)
A Control box
C ø21 hole (closed rubber bushing)
E Clip cables here
 Never connect the power cable to the terminal board for control cables.
(Otherwise it may be broken.)

Be sure to wire between the control wire terminal boards for indoor unit,
outdoor unit and HBC/Sub-HBC controller.
Use non-polarized 2-wire as transmission cables.
Use 2-core shielding cables (CVVS, CPEVS) of more than 1.25 mm
transmission cables.

7. Setting addresses and operating units

The address switch of each HBC/Sub-HBC controller is set to "000" when shipped
from the factory.
• Set the address switch to an address that equals the lowest address of the indoor
units that are connected to the HBC/Sub-HBC controller plus 50.
8. Test run
Before commencing a test run please check the
following:
 After installing, piping and wiring the indoor units and HBC controllers,
check to see again that there is no refrigerant leakage, water leakage, the
indoor unit inlet and outlet piped backwards, and no slack on power and
control cables.
 Use a 500 V tester to check that there is an insulation resistance of more
than 1.0 MΩ between the power terminal block and the ground. If it is less
than 1.0 MΩ, do not operate the unit.
• When water has been supplied to the water pipework, purge the system of air.
The details of air purging can be found separately in the water circuit
maintenance manual.
B Power source wiring
D Transmission wiring
in diameter as
2
The switch capacity of the main power to HBC/Sub-HBC controllers and the wire size
are as follows:
Switch (A)
Molded case
circuit breaker
Capacity Fuse
16 16 20 A
• 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.
 Assign the HBC controller address that equals the lowest address of the
indoor units that are connected to the HBC/Sub-HBC controller plus 50.
However, if the address overlaps any other units' addresses, assign the
address that equals the next lowest address plus 50.
• Please refer to the outdoor unit installation manual.
Caution:
• Never measure the insulation resistance of the terminal block for any
control cables.
• Incomplete purging of the air in the system, closing of the valves upstream
or down stream of the pump etc. may cause the pump to operate with no
water flow and thus lead to pump failure.
• Ensure that the power is off when replacing a pump. Do not remove or
attach the pump connector with the power on. Otherwise pump will break.
After turning off the power, wait 10 minutes before commencing work.
Earth leakage
Wire size
breaker
20 A 30 mA
1.5 mm
2
0.1 s or less
15