17
en
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.7)
[Fig. 6.0.2] (P.7)
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.
Use non-polarized 2-wire as transmission cables.
Use 2-core shielding cables (CVVS, CPEVS) of more than 1.25 mm
2
in diameter as
transmission cables.
The switch capacity of the main power to HBC/Sub-HBC and the wire size are as
follows:
•
For other detailed information, refer to the outdoor unit installation manual.
•
Use a power cable with a maximum outer diameter of 17 mm and a maximum
bending radius of 25 mm.
•
Power supply cords of appliances shall not be lighter than design 60245 IEC 53
or 60227 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.
7. Setting addresses and operating units
The address switch of each HBC/Sub-HBC 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 plus 50.
Assign the HBC address that equals the lowest address of the indoor units
that are connected to the HBC/Sub-HBC 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.
8. Test run
8.1. Before starting the test run
Before starting the test run, please check the following:
After installing, piping and wiring the indoor units and HBC, 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 M
Ω
between the power terminal block and the ground. If it is less
than 1.0 M
Ω
, do not operate the unit.
•
When water has been supplied to the water piping work, purge the system of air.
The details of air purging can be found separately in the water circuit
maintenance 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.
A
Control box
B
Power source wiring
C
ø21 hole (closed rubber bushing)
D
Transmission wiring
E
Cable strap
F
Wire saddle
A
Control box
B
Power source wiring
C
ø21 hole (closed rubber bushing)
D
Transmission wiring
E
Clip cables here
Switch (A)
Molded case
circuit breaker
Earth leakage
breaker
Wire size
Capacity
Fuse
16
16
20 A
20 A 30 mA
0.1 s or less
1.5 mm
2
01_WT09805X01_en.book 17 ページ ２０２１年１１月１日 月曜日 午前８時４７分
