Articles by Bill Johnson

Btu Buddy 133: Evaporator Coil Freezing, Low Ambient Problems

April 21, 2014

Bob and Tim were on their way to a no cooling call, their first of the season, when Tim asked, “Wonder why we would have a no cooling call this time of year? It is only 75°F during the day and 40° at night.”


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Btu Buddy 132: Tuning an Oil Furnace

March 24, 2014

Tim had asked Bob to go into depth about tuning an oil burner during the last service call. “You said that oil burning equipment requires more attention than any other type of residential heating equipment,” Tim said. “Can you explain why?”


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Btu Buddy 131: Oil Burner Service Call

February 17, 2014

Bob and Tim were on their way to an oil heat service call. It is cold and the owner has no heat. Tim read the service ticket for today and said, “The owner says that the burner won’t burn and makes a sputtering sound for a few minutes and shuts off.”


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Btu Buddy 130: Heat Pump Electrical Problems

January 20, 2014

Bob and Tim have gotten together for another informational session. Tim requested some extra after-hours training about heat pumps. In their last session, they talked about heat pump mechanical problems. This time they discuss electrical problems.


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Btu Buddy 129: Heat Pump Service Tips

December 23, 2013
Bob and Tim were taking a break and Bob began explaining some of the tips that he has learned in servicing heat pumps. Bob said, “Let’s go over some of the service problems that you may have with a heat pump.”


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Btu Buddy 128: Why a Heat Pump?

November 18, 2013
The season was getting colder and heating calls were beginning to come in. Bob and Tim were riding to a large residence that had three heat pumps to provide heating and cooling for the structure and Tim asked a question, “Why are heat pumps so popular?”


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Btu Buddy 127: A Hunting TXV

October 21, 2013
Bob and Tim were doing a routine service contract call. They had fastened gauges to the compressor at the condensing unit and had a temperature lead fastened to the suction line at the evaporator coil. They were observing the pressures and temperatures and Tim said, “The suction pressure is not stable. Isn’t it supposed to be stable during a long running cycle?”


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Btu Buddy 126: Gaining Efficiency with Subcooling

September 23, 2013
Bob and Tim have been tuning up a system with an orifice metering device for the correct evaporator charge, when Bob said, “There is another verse to tuning up a system, and it’s called subcooling.”


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Btu Buddy 125: Superheat Explained - Part 2

August 19, 2013
Bob and Tim were on their way to a no cooling call at a residence. They were pretty sure that it was a low refrigerant call. Bob said, “I hope that we can put the last lesson into practical practice. We have gone to a great deal of trouble to understand superheat.”


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Btu Buddy 124: Superheat Explained - Part 1

July 22, 2013
Bob and Tim were in the company conference room where Bob is set to give Tim some extra training at Tim’s suggestion. Bob said, “Tim, you asked for more explanation of what superheat is. This is not a very simple topic. It will take a couple of meetings to go into detail about it.”


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