9. SPECIAL ADVICE CONCERNING R-404A REFRIGERANT
R-404A is a mixture of 3 liquid-phase gases. On evaporating, the 3 component gases separate
Always use the liquid phase valve (at the end of condenser or accumulator) for refills and
purges.
When replacing a compressor, wash inside of circuit with a suitable solvent + pump, dry with
nitrogen gas, REPLACE THE DRIER WITH ONE SUITABLE FOR R-404A, which must
also
have ANTI-ACID properties.
If you need to add oil, use one which is specific for R-404A (POE). If you are in doubt,
contact
the machine manufacturer.
If there is a leak anywhere in the circuit where R-404A in the GAS phase, and a refill of
over
10% is required, then ALL THE GAS IN THE CIRCUIT MUST BE PURGED AND
THEN
REFILL AS DESCRIBED PREVIOUSLY (LIQUID PHASE VALVE)
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