11 Maintenance notes
Maintenance work
SMGB0136 rev.0 - 07/2021
326
11.2 Maintenance work
! CAUTION
• All inspections and checks of the outdoor unit and indoor unit have to be carried out by a licensed technician and never by the user
itself.
• Before any inspection and check the unit main power supply has to be switched OFF.
• Wait minimum 10 minutes or more from all power supply have been turned OFF.
• Take care with the crankcase heater. It could operate even when compressor is OFF.
• Take care with the electrical box components. Some of them could remain hot after switch OFF the unit.
? NOTE
All these maintenance operations must be done with appropriate materials and following this manual.
Outdoor unit
1 Fan and fan motor
• Lubrication: All the fan motors are pre-lubricated and sealed at the factory. Therefore no lubrication maintenance
is required.
• Sound and vibration: Check for abnormal sounds and vibrations.
• Rotation: Check the counter clockwise rotation and the rotating speed.
• Insulation: Check the electrical insulation resistance.
• Activation: Check for any abnormal activation sound.
2 Heat exchanger
• Clog: Inspect the heat exchanger at regular intervals and remove any accumulated dirt and any accumulated
dust from the heat exchanger. You should also remove other obstacles such as the growing grass and the pieces
of paper which might restrict the airow.
3 Refrigerant piping connection
• Leakage: Check for the refrigerant leakage at the piping connection between the outdoor and the indoor unit.
• Pressure: Check the R32 refrigerant pressure using the check joints of the outdoor unit.
4 Cabinet
• Stain and lubrication: Check for any stain and any lubrication. Remove the stain and the lubrication.
• Fixing screw: Check for any loosened screw or any lost screw. Fix the loosened screws and the lost screws.
• Insulation material: Check for any peeled thermal insulator on the cabinet. Repair the thermal insulator.
5 Electrical equipment
• Activation: Check for an abnormal activation of the magnetic contactor, the auxiliary relay, the PCB and others.
• Line condition: Pay attention to the working voltage, the working amperage and the working phase balance.
Check for any faulty contact that is caused by the loosened terminal connections, the oxidized contacts, the
foreign matter and other items. Check the electrical insulation resistance.
6 Control device and protection device
• Setting: Do not readjust the setting in the eld unless the setting is maintained at a point that is different from the
point listed in the Installation and operation manual.
7 R32 compressor
• Sound and vibration: Check for abnormal sounds and vibrations.
• Activation: Check that the voltage drop of the power supply line is within 15% at the start and within 2% during
the operation.
8 Reversing valve
• Activation: Check for any abnormal activation sound.
9 Strainer
• Clog: Check that there is no temperature difference between both ends.
10 Ground wire
• Ground line: Check for the continuity to earth.
11 Oil heater (Crankcase heater of the R32 compressor)
• Activation: You should activate the oil heater at least 12 hours before the start-up by turning ON the main switch.
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