Articles by Bill Johnson

Btu Buddy 127: A Hunting TXV

By Bill Johnson
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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

By Bill Johnson
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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

By Bill Johnson
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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

By Bill Johnson
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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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Btu Buddy 123: Devastated 20-Ton Condensing Unit - Part 2

By Bill Johnson
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Bob and Tim were driving to the job they left yesterday and talking over what needs to be done today, when Tim asked, “How are we going to move the condensing unit we disconnected to the new location so we can connect it to the system where we disconnected the defective condensing unit? You said you had a plan.”


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Btu Buddy 121: Heat Pump No Heat Call - Part 2

By Bill Johnson
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Bob and Tim had left this residence a few days ago when they discovered that the four-way valve on the home’s heat pump was stuck in the cooling mode. They tried several things to get the valve to do its normal changeover to the heating mode and couldn’t get it to function. The valve would need to be replaced.


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Btu Buddy 120: Heat Pump No Heat Call - Part 1

By Bill Johnson
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Bob and Tim were on their way to a service contract routine procedure when the dispatcher called and asked them to go to a residence that had no heat and had a very sick family member. They needed heat as quickly as possible.


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Btu Buddy 119: Low Heat and a Hot Furnace

By Bill Johnson
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Bob and Tim were on their way to a “low heat” call at a residence when the dispatcher called them back and told them that the homeowner had called and explained that the furnace was hot, but the home was cold. The dispatcher had told the owner to shut the furnace off until Bob and Tim arrived. 


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Btu Buddy 118: Tim Gets a Shock

By Bill Johnson
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Bob and Tim arrived at their fifth service call of the day. They were both wet from servicing a heat pump outdoor unit in the snow. This was a no heat call for a gas furnace. The weather was cold and there was no heat at all in the house. 


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Btu Buddy 117: Oil Burner Pump Problem - Part 2

By Bill Johnson
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Bob and Tim have gotten together after work to discuss the oil furnace service call that they were on earlier in the day. Bob had asked Tim if he would be willing to stay after work and review the call and Tim readily agreed.


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