ESIE16-02B | Part 4. Maintenance 4.2. Outdoor unit
Page 90 4/04/17 | Version 1.1
RA R32 Split & multi split M-Series
4.2. Outdoor unit
4.2.1. General maintenance outdoor unit
1. 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 during
the 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.
CAUTION
Make sure not to bend the hair fins.
COOLING Low pressure High pressure Running current
Dirty air filter Higher Higher Higher
Short circuit of air inlet/outlet Higher Higher Higher
Air mixed in refrigerant Higher Higher Higher
Water mixed in refrigerant Lower* Lower Lower
Dirt mixed in refrigerant Lower** Lower Lower
Refrigerant shortage (gas) Lower*** Lower Lower
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