Compressor testing

At HOS BV we strive to supply used cooling equipment that you can rely on. Our compressors meet the highest standards in terms of reliability and efficiency. HOS BV uses various test protocols and quality standards for all types of cooling equipment. We also provide detailed insight into our testing procedures for evaporators, condensers, dry coolers and chillers. Keep reading to get an idea of how we maintain our high-quality benchmarks across all the compressors we offer.

How we test a semi-hermetic refrigeration compressor:

  • Electric measurement (Megger) testing (resistance and insulation testing)
  • Oil filter is removed and oil quality is inspected
  • Compressor is run to build up pressure to 15 bar
  • Compressor is observed to check if the pressure does not drop (leakage test)
  • If pressure is maintained, pressure gets released and the compressor is put on 2 bar nitrogen pressure
  • Compressor gets released for industrial cleaning
  • If agreed with the customer, the compressor gets a new paint job.
  • Compressor gets packaged for safe transport

Electrical testing

We begin by performing a Megger test. The Megger device is used to test resistance and insulation. Meggers use a high-voltage, low-current DC charge that measures the resistance within wires and motor windings to identify current leakage and faulty or damaged insulation. With a Megger test, we can verify the integrity of the wires in a machine.

Oil filter removal and oil quality inspection

We first remove the oil filter to inspect the quality of the oil. The oil filter gets a visual inspection to determine if the filter is still in good shape, or needs replacement. After that, the oil itself gets inspected to see if there is enough oil and if it is clean enough.

When the oil and filter are of expected quality, the compressor gets released for a pressure test.

Electrical testing
Pressure test

Pressure test

After the oil is inspected and it is safe to run the compressor, we perform a pressure test. The compressor is run to build up pressure to 15 bar. The compressor is then observed to check if the pressure does not drop. If the pressure is maintained, the pressure gets released and the compressor is put on 2 bar nitrogen. After this test, we can be assured of good functionality of the compressor. This is why HOS BV provides a warranty for compressors.

The final steps

When a compressor passes all the quality checks, it gets sent to our washing station. The compressor gets an industrial cleaning here. In some situations, the customer wants a new paint job, in which case the compressor gets transported to our spray booth to get spray painted to look as good as new. When the compressor looks how the client wants it to look, it is packaged for safe transport.