Articles Tagged with ''troubleshooting''

The Professor: Loss of Air Conditioning Cooling

By John Tomczyk
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For this column I want to discuss a real life situation regarding poor cooling in a residence and reduced airflow coming from the registers in the house. The air conditioner is a three ton (36,000 btuh), HCFC-22, split type, air conditioner with the A-coil in the plenum of the furnace located in the basement.
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Btu Buddy 100: Dual-Voltage, Nine-Lead Motors

By Bill Johnson
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Btu Buddy has met Bob for lunch to answer some questions that Bob had about yesterday’s service call. Bob asked, “Why did that motor have two contactors and so many wires going to it? It seemed very confusing. I am glad that I tagged those motor leads when I disconnected the motor. I never would have figured out how to reconnect the leads.”
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Ice Breaker: Read and Record

By Joe Marchese
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When a refrigeration system fails, many times the cause can easily be diagnosed. However there are occasions when the cause cannot easily be determined - either the true cause is unclear or the technician is unsure of a problem. How do you work through these jobs? One method used by some techs is to “read and record.”
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Btu Buddy 99: Large Compressor Motor Grounded

By Bill Johnson
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Bob got a call to go to a convention center where the air conditioning system was not working. It was a 75-ton unit with one compressor. The system was many years old, but had been functioning fine, until now. After checking out the unit, an ohm check showed 0 resistance to ground.
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Troubleshooting Power Problems on HVAC Equipment

By Wade Thompson
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A variable frequency drive (VFD) fails to vary the discharge-air fan speed. A motor overheats and fails prematurely. While each troubleshooting problem in an HVAC system presents its own unique set of circumstances, HVAC professionals may recognize such problems as possible power quality issues.
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Ice Breaker: What Frosted Suction Lines Don't Tell You

By Joe Marchese
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Actually, frost on the suction line only indicates that at the location where the frost is present, the suction line piping is below the dew point temperature of the surrounding ambient air and at or below 32°F. That’s it. It is neither an indication of a properly operating system nor a system defect.
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Is Raising Heat Pumps Really Necessary?

By Robin Boyd
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It is the time of year when I get calls for heat pumps not cooling properly. With a little prodding, I usually hear that the past month’s electric bill was also high, even though it wasn’t that hot. These calls always raise one major red flag for me. One of my first questions is if the heat pump is properly elevated up off the pad.
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Ice Breaker: Brazing Tips for the Technician

By Joe Marchese
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The process of brazing ACR tubing is a common task for many refrigeration technicians. Although this is relatively simple, there are some system problems that can occur if some basic brazing procedures are not followed.
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Btu Buddy 97: Defective Compressor or Four-Way Valve Problem?

By Bill Johnson
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Bob has been sent on a service call where the customer is complaining about her power bill. She thinks that the heat pump may be the problem. Her power bill is much higher than last year. She explained this to Bob and he started by asking a question, “Does the auxiliary heat light come on very often on your thermostat?”
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Ice Breaker: Testing Your Tools to Make Sure They Work

By Joe Marchese
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Accurately troubleshooting and repairing refrigeration systems requires technicians to use many specialty instruments. They base many of their diagnoses on what is read from these instruments. Relying on them to be consistently accurate day in and day out is a must. If these tools are inaccurate, more than likely the diagnoses will be inaccurate.
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