Mitsubishi R410A User's Manual | Page 10
To ensure problem-free operation of any air-conditioning system, it is
crucial to carry out thorough evacuation of the system. During the
evacuation any moisture is removed from all of the system components
and the pipework.
The importance of thorough evacuation
It is vitally important to thoroughly evacuate any refrigeration system in
order to prevent the following harmful effects:
> Any non-condensible product left in the system can cause the
pressure in the condenser to increase and in turn, the
compression temperature to rise.
> Moisture will result in adverse reactions in the refrigerant circuit.
> The polyester oils used in the R410A refrigeration systems are
hydroscopic, which means that they absorb moisture from the air.
To prevent chemical reactions in the system, any moisture must
be removed at all costs.
> Oxygen (air) reacts with the refrigeration unit oil and can lead
to faults such as compressor failure.
To be able to remove moisture from the system it must be evaporated.
The pressure in the pipework must be reduced to such an extent that the
ambient temperature is sufficient to evaporate the moisture.
Page 8
Ensure correct
system evacuation
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