Troubleshooting Puzzle: A Walk-in Freezer That’s not Performing

In this month’s troubleshooting situation, you are responding to a restaurant manager’s call for service, and the equipment is a walk-in freezer that is supposed to maintain a cabinet temperature near 0°F. When you arrive, you observe the following:

Cabinet temperature is 20° and ambient temperature is 75°
The equipment is controlled by a temperature controller and a pump-down solenoid
The evaporator and condenser fan motors are operating normally
Both coils are clean and there is no obstruction limiting their air flow
Liquid line sight glass is clear
Compressor current draw is normal

As your next step, you perform a temperature test across the filter drier, which shows the results illustrated in Figure One.

Your troubleshooting question: What is the next step you need to take in servicing this equipment?

Let us know your answer here!

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Jim Johnson is the director of training for Technical Training Associates, a Tucson, Ariz.-based firm that provides HVACR technician training DVDs/videos, E-books, and workshops. For more information, call 520-625-6847 or visit www.techtrainassoc.com.

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