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2.3.3 Equalizing operation of compressors’ oil
• The equalizing operation of a sub unit which no compressor operates is not performed.
• The equalizing operation of a sub unit which one compressor operates.
1) The operating compressor runs for 2 min. and stop.
2) The other compressor runs for 2 min.
3) After the equalizing operation, the primarily operating compressor runs.
• The equalizing operation of a sub unit which two compressors operate.
1) One compressor stops at the beginning of equalizing operation of compressors oil by decrease of one
stage. The compressor which stops is decided by the stage table.
2) The operating compressor runs for 2 min.
3) The operating compressor stops after 2 min.
4) The other compressor runs for 2 min.
5) After 2 min., two compressors run by increase of one stage.
• Equalizing control about inverter compressor.
1) Inverter compressor keeps Min. frequency for 2 min.
2) Frequency increases 80Hz about 2 min.
3) Thereafter, Inverter compressor decreases to 40Hz.
• The change condition of equalizing operation.
If high pressure rises up to the high pressure limit condition.
Alternative equalizing operation begins.
❇ Alternate equalizing operation runs only one compressor in turn for 2 min.
• The skip conditions of oil equalizing operation.
liquid injection on
abnormally high pressure.
Function
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