21
Form the wires and x the cover mmly so that the
cover may be t in properly.
When you do not use a wire conduit, be sure to
protect the wires with vinyl tubes to revent the edge of
the knock-out hole from cutting the wires.
Follow the electric wiring diagram for electrical wiring
works.
Form the wires and x the cover mmly so that the
cover may be t in properly.
- Do not connect wires of different gauge to the same
power supply terminal. (Looseness in the connection
may cause overheating.)
Use the correct screwdriver to tighten the terminal
screws. Small screwdrivers can damage the screw
head and prevent appropriate tightening.
Over-tightening the terminal screws can damage the
screws.
10.3. Specications of standard wiring
components
CAUTION
Select all cables and wire sizes in
accordance with applicable legislation.
After nishing the electrical work, conrm
that each electric part and terminal inside the
electric part box is connected securely.
The earth leakage breaker must be a high-
speed type breakerof 30 mA(<0.1 s).
11. Test operation
DANGER
Never leave the unit unattended during
installation or servicing. When the service panel
is removed live parts can be easily touched by
accident.
INFORMATION
Note that during the rst running period ofthe
unit, required power input may be higher
than stated on the nameplate ofthe unit. This
phenomenon originates from the compressor
that needs elapse of a 50 hours run in period
before reaching smooth operation and stable
power consumption.
11.1. Pre-run checks
Items to check
Electrical
wiring Inter-
unit wiring
Ground wire
Is the wiring as mentioned on the
wiring diagram?
Make sure no wiring has been
forgotten and that there are no missing
phases or reverse phases.
Is the unit properly grounded?
Is the wiring between units connected
in series correct?
Are any of the wiring attachment
screws loose?
Is the insulation resistance at leaset 1 MΩ?
- Use a 500V mege-tester when
measuring insulation.
- Do not use a mega-tester for low-
voltage circuits.
Refrigerant
piping
Is the size of the piping appropriate?
Is the insulation material for the piping
attached securely?
Are both the liquid and gas pipes
insulated?
Are the stop valves for both the liquid
side and the gas side open?
Extra
refrigerant
Did you write down the extra refrigerant
and the refrigerant piping length?
Be sure to perform a test run.
Be sure to fully open the liquid-side and gas-side stop
valves. If you operate the unit with stop valves closed,
the compressorwill breakdown.
Be sure to execute the rst test run of the installation
in cooling mode operation.
Never leave the unit unattended with an open front
panel during test run.
11.2. Precautions regarding test-runs
1. In order to detect stop valves failing to open,
operation ofthe unit is compulsorily performed in
cooling for 2-3 minutes during the first test run, even
ifthe remote controller was set to heating operation.
In this case, the remote controllerwill have
keptdisplaying the heating symbol all the time and the
unit will switch to heating operation automatically
after elapse of that time.
2. In case you cannot operate the unit in test run mode
for any unusual reason, refer to "11.4. Failure
diagnosis at the moment offirst installation".
3. In case of a wireless remote controller, execute
the run only after having installed the indoor unit
decoration panel with infrared receiverfirst.
4. In case the panels of indoor units are not yet installed
to the indoor units, make sure to shut off the power
supply after finishing the complete test run.
5. A complete test run surely includes shutting off power
after having performed a normal operation stop
on the remote controller. Do not stop operation by
turning circuit breakers off.
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