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SPECIAL ADVICE CONCERNING R-404 REFRIGERANT
• R-404 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-404, which must also
have ANTI-ACID properties.
• If you need to add oil, use one which is specific for R-4
04 (POE). If you are in doubt, contact
the machine manufacturer.
• If there is a leak anywhere in the circuit where R-404 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)
• When charging via low-pressure valve, do not start compressor immediately, allow about one
hour for liquid to gasify.
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