Hitachi RAW-35RHC - Maintenance Work; Outdoor Unit

7.1 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.
7.1.1 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 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airow.
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eldunlessthesettingismaintainedatapointthatisdi󰀨erent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.
7 Maintenance notes
Maintenance work
SMGB0135 rev.0 - 06/2020
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