Question 1

What does chiller surge sound like?

Accepted Answer

Chiller surge sounds like a repeated deep banging, thumping, or roaring noise. It comes from rapid pressure reversals inside the compressor and often appears as a rhythmic “whoom-whoom” sound.

Question 2

Is chiller surge dangerous?

Accepted Answer

Yes. Chiller surge is harmful because it creates severe pressure fluctuations and vibration. If not corrected, it can damage the compressor, shorten equipment life, and lead to unexpected shutdowns.

Question 3

What causes chiller surge at low load?

Accepted Answer

At low load, the evaporator produces less refrigerant vapor, reducing suction pressure. When flow becomes too low for stable compression, the gas reverses direction, causing surge.

Question 4

Can low refrigerant charge cause chiller surge?

Accepted Answer

Yes. Low refrigerant charge lowers suction pressure and pushes the compressor outside its stable operating range. This condition makes centrifugal chillers much more prone to surge.

Question 5

What is the difference between surge and stall in a centrifugal compressor?

Accepted Answer

Stall is a brief loss of stable airflow in part of the impeller. Surge is a full flow reversal through the compressor. Surge is more severe, louder, and far more damaging than stall.

Question 6

Does chiller surge damage the compressor?

Accepted Answer

Yes. Repeated surge events can damage bearings, seals, impellers, and motors. The vibration and pressure swings accelerate wear and may eventually lead to major compressor failure.

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Chiller Surge

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