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Smart Power
7.9 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 of the unit, required power input may be higher than stated on the
nameplate of the 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.
7.10.1 Pre-run checks
ltems to check
Electrical wiring lnter-unit
wiring Ground wire
• ls 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.
• ls the unit properly grounded?
• ls the wiring between units connected in series correct?
Are any of the wiring attachment screws loose?
ls the insulation resistance at least 1MΩ?
- Use a 500V mege-tester when measuring insulation.
- Do not use a mege-tester for low-voltage circuits.
Refrigerant piping
• ls the size of the piping appropriate?
• ls 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
compressor will break down.
• 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.
7.10.2 Precautions regarding test-runs
1. In order to detect stop valves failing to open, operation of the unit is compulsorily performed in cooling for 2-3
minutes during the rst test run, even if the remote controller was set to heating operation. In this case, the
remote controller will have kept displaying 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 "15.5. Failure diagnosis at
the moment of rst installation" on page 19.
3. In case of a wireless remote controller, execute the run only after having installed the indoor unit decoration
panel with infrared receiver rst.
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 nishing 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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