ESIE16-02B | Part 4. Maintenance 4.2. Outdoor unitPage 90 4/04/17 | Version 1.1RA R32 Split & multi split M-Series4.2. Outdoor unit4.2.1. General maintenance outdoor unit1. Outdoor unit coil- Straighten hair fins.- Clear coil from dust, leaves, etc. with a fin-comb, or compressed air/N2. Avoid bending or damaging of the Alu fins duringthe cleaning process.2. Correlation of air-conditioner's operation status, pressure and running current.* Water in the refrigerant freezes inside the electronic expansion valve and is basically the same phenomenon as pump down.** Dirt in the refrigerant clogs filters inside the piping and is basically the same phenomenon as pump down.*** Pressure differential between high and low pressure becomes low.C AUTIONMake sure not to bend the hair fins.COOLING Low pressure High pressure Running currentDirty air filter Higher Higher HigherShort circuit of air inlet/outlet Higher Higher HigherAir mixed in refrigerant Higher Higher HigherWater mixed in refrigerant Lower* Lower LowerDirt mixed in refrigerant Lower** Lower LowerRefrigerant shortage (gas) Lower*** Lower Lower
