Maintenance Work; Outdoor Unit - Hitachi YUTAMPO Series Service Manual

7 Maintenance notes

7.1 Maintenance work

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C A U T I O N

•

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.

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Before any inspection and check the unit main power supply has to be switched OFF.

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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.

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N O T E

All these maintenance operations must be done with appropriate materials and following this manual.

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 clockwise rotation and the rotating speed.

• Insulation: Check the electrical insulation resistance.

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 airflow.

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: Check for any stain and remove it cleaning if it is the case.

• 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 field 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 Reverse valve

• Activation: Check for any abnormal activation sound.

9 Ground wire

• Ground line: Check for the continuity to earth.

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SMGB0135 rev.0 - 06/2020