Service & Maintenance / Extra Edition

Troubleshooting Challenge: A Refrigeration System With a History of Compressor Failure

Figure 1. (Click on the image for an enlarged view.)

Your troubleshooting situation this time around relates to a walk-in refrigeration system in a busy restaurant that has experienced a compressor failure… specifically a mechanical failure. And it’s not the first time.

This particular system has experienced compressor failure twice in the several years it has been in operation, and the customer is looking for assurance from you that history will not repeat itself after you have completed your compressor replacement. In Figure 1, we’re showing you an overview of this particular system, illustrating the actual physical layout of the system components in their relationship to each other.

Figure 2. (Click on the image for an enlarged view.)

And, in Figure 2, we’re showing you a more detailed look at one segment of the system: the thermostatic expansion valve (TEV), evaporator coil, and suction line. (Hint: Look at both of these illustrations from the perspective of something that is not shown as part of the system, and would be shown on the liquid line if it was there.)

Your troubleshooting question: What is the source of the problem that is responsible for repeated compressor failures on this unit?

Compare your answer with ours by clicking here.

Publication date: 03/08/2010

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