In this issue’s troubleshooting situation, the problem unit we’re facing is a reach-in refrigerator in a restaurant and the customer’s description of the problem is that they discovered spoiled food in the cabinet when they arrived early in the morning prior to opening.
Bob gets a call to go to an office building where its water-cooled chiller is not cooling the building. Bob finds that the suction pressure is a little low and the head pressure is about right but the unit is not cooling the water down to the 45°F design setting. Btu Buddy helps him in going step by step to solve the problem.
When you’re troubleshooting a refrigeration control system, keep in mind that no matter how complicated the schematic might look on paper, the control system is actually only trying to provide a few simple outcomes.
Warmer spring weather is here and Bob is beginning to get calls about units that are not cooling. He has just received a call from an old customer who said that her unit cools fine during the morning and daytime, but at night, it stops cooling. Bob investigates, and with Btu Buddy's help, finds the coil is dirty.
This time around we have a customer who has called to say that it’s warmer than it should be in their home. When you arrive you find a nine-year-old package unit, and you determine in a short time that, electrically, everything is as it should be, which means that what you have is a unit that is running, but is not cooling enough.
The customer had called another contractor and was not pleased with the results, so Bob’s company was called. The other technician said he could not get the compressor to start. With Btu Buddy’s help, Bob checks all the components that have to do with starting the compressor. He finds that the start relay needs to be replaced.
With the approach of 2010, the industry will be faced with a shift in both refrigerants and system lubricants. The impending phaseout of chlorine-based refrigerants mandates that the industry move to lubricants that work satisfactorily with the new hydrofluorocarbon (HFC) refrigerants.
If duct cleaning is necessary, it is important that the cleaning professionals be familiar with both the North American Insulation Manufacturers Association (NAIMA) and National Air Duct Cleaning Association (NADCA) guidelines. Today’s air duct insulations are designed to withstand the rigors of cleaning.
Bob and Btu Buddy sit down for a lunch discussion about humidifiers and Bob asks: “Aren’t all humidifiers about the same?” Btu Buddy responds, “They are all the same in that they add moisture to the air. Different homes have different types of heating systems.” He then discusses the ways water is evaporated in various humidifiers.
After your evaluation of the equipment, you’re leaning toward the diagnosis that the motor is failing and you double-check two things. Your troubleshooting question: Which component was replaced, eliminating the intermittent equipment operation failures?
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