AUX-DC inverter ARV outdoor unit individual series technical manual
107
1. Discovery of moisture during refrigerant piping flush.
2. Conducting construction on rainy day, because rain water might penetrated into pipeline.
3. Construction period is long, and rain water might penetrated into pipeline.
4. Rain water might penetrate into pipeline during construction.
Procedures of special vacuum drying are as follows:
1. First stage vacuum drying 2 hours.
2. The second vacuum damage, charging nitrogen to 7.1PSI(0.5kgf/cm2).
Because nitrogen is dry, vacuum damage could achieve the effect of vacuum drying, but this method
can’tsufficiently dry the system when there is too much moisture. Therefore, it is crucial to ensure that
moisturedoes not enter the system and condensation does not form.
3. Second stage vacuum drying 1 hour.
Vacuum drying is confirmed complete when vacuum degree is under -14.6PSI(-755mmHg); if the
vacuumdegree is still above -14.6PSI(-755mmHg) within 2 hours drying, please repeat the
procedures of “vacuumdamage---vacuum drying”.
4. Vacuum placement test: when the vacuum degree reaches -14.6PSI(-755mmHg), keep for 1 hour. If
thevacuum gauge indicator does not increase, the process is complete. If the vacuum gauge
increases, itindicates of moisture or a leak.
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