7 Commissioning
Before the test run
SMGB0136 rev.0 - 07/2021
145
7
7.2 Before the test run
! CAUTION
• Disconnect all the power supply switches.
• Use a multimeter and check that all the switches are disconnected.
Before carrying out the test run, check that the unit is properly installed in accordance with the Installation and Operation
Manual. After that, check the following parts.
Check items Contents
1
Damage Is the unit or its internal parts damaged?
2 Fan motor
Is the fan runner installed in the centre of the casing? Is the fan motor installed outside the
casing? (The fan motor must not make contact with the casing.)
3 Screws
Havethescrewsloosenedduetovibrationduringtransport?Checkthatthescrewsarermly
fastened during the installation, especially the screws for the electrical wiring.
4 Refrigerant leak
Checkthatnorefrigerantleaksarepresent.Thepipetorquepart(arepart)maybelooseneddue
to vibration during transport.
5 Setting the DSW Check that the DSW setting is the same as before shipment.
6 Insulation *
Measure the resistance between electrical components terminal and ground using a multimeter.
Itisnormalfortheresistancetobe1MΩandgreater.
Ifitis1MΩorless,donotstart-uptheunitduetoinsulationfailuresintheelectricalparts.Donot
apply power to the operating line terminal board (The control PCB may be damaged).
7 Stop valve completely open Before the test run, check that the outdoor unit stop valve is completely open.
8 Power phases
Operation is not available with an incorrect power phase or absence of a phase.
• Alarm “03” or “05” will be displayed on the remote control LCD screen.
• Alarm “03” or “05” will be displayed on the outdoor unit 7 segment display.
Check the power phase in accordance with the caution label located near the terminal board of
the outdoor unit or on the back side of the service cover.
9 Turn ON crankcase heater **
Once items 1 to 8 have been completed, turn ON power supply to the outdoor unit. The electricity
is provided to the crankcase heater to heat the compressor.
The compressor may be damaged if not pre-heated. Therefore, the compressor must be activated
after the power supply is turned ON for at least 12 hours.
10
Indoor and outdoor
temperature
To be used with cooling and heating operation:
Is the indoor temperature 27 °C DB or lower during the heating operation? (The heating operation
may not be operated due to the activation of the operating overload prevention with an ambient
temperature of 27 °C DB or over).
In order to carry out the operational test, set the test mode via the remote control.
? NOTE
* Insulation resistance
InthecasethattheunithasbeenturnedOFFforlargeperiodsoftime,theinsulationresistancemaybereducedto1MΩorlessbecause
the refrigerant is maintained in the compressor. Check the following points.
• Disconnectthecompressorcablesandmeasuretheinsulationresistanceofthecompressoritself.Iftheresistanceis1MΩandover,
failures have occurred in the insulation of other electrical parts.
• Iftheresistanceis1MΩorlower,reconnectthecompressorandturnONthemainpowersupply.Thecompressorwillautomatically
be heated. Re-check the insulation resistance after current has been applied for at least 3 hours (the pre-heating time depends on the
air conditions, the length of the piping or the condition of the refrigerant).
Before connecting the circuit breaker, check the rated capacity.
** Stoppage of the compressor operation
The compressor may not be available for a maximum time period of 4 hours if the power supply is not previously turned ON. At this time,
stoppage code (d1-22) is displayed on the LCD screen of the remote control and the forced Thermo-OFF function is started.
If compressor operation is required:
1 Turn ON the power supply to the outdoor unit
2 Wait 30 seconds and press of the outdoor unit for at least 3 seconds:
- PSW1 on PCB1 for models from 4 to 6 HP 3N~ 400V 50Hz
- PSW1 on PCB2 for models from 3 to 6 HP 1~ 230V 50Hz
The forced Thermo-OFF function (d1-22) will be cancelled and the operation of the compressor will be available.
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