Articles by Bill Johnson

Btu Buddy 106: Heat Pump Service Call - Part 1

By Bill Johnson
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Bob and Tim have arrived at a home where the owner is complaining that the heat pump is not heating properly. It has been getting cold in the home during the late night and early morning hours. It’s really cold outside, about 10°F at night and 25° during the day.


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Btu Buddy 105: Furnace Vent Problem

By Bill Johnson
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Tim and Bob have been sent on a service call to a new customer’s house. The homeowner has an unusual complaint. She said that she thinks she has a furnace problem because there is mold in her house. They don’t know what this can be all about.


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Btu Buddy 104: Bob and Tim Continue Heat Pump Repairs

By Bill Johnson
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Bob and Tim have arrived back at the apartment building where they have been working for several days inspecting and making necessary repairs to the building’s split-system heat pumps. Bob said, “Check the list for another unit that seemed to have a problem and let’s take a closer look at it.”


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Btu Buddy 103: Bob and Tim Begin Heat Pump Repairs

By Bill Johnson
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Bob and Tim have arrived at the apartment house that they have been working at for the last several days. They’ve gone to the roof where the outdoor units are located. There are 60 heat pumps that use R-22 as the refrigerant. They start with Unit No. 2.


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Btu Buddy 102: Continuing the Inspection of Multiple Split-System Heat Pumps

By Bill Johnson
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Bob and Tim are on the second day of an inspection of an apartment house building that has multiple split-system heat pumps. They have inspected all 60 outdoor units on the roof. They are now going to inspect the indoor units.


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Btu Buddy 101: Bob Trains Tim on His First Service Call

By Bill Johnson
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Bob and Tim have arrived at Tim’s first service call. Tim asked Bob, “What is this call all about?” Bob said, “This is a new customer that wants us to take over the maintenance work for this apartment house.”


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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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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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Btu Buddy 98: Compressor With Internal Leak

By Bill Johnson
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Bob has received a call from the dispatcher about a system that is not cooling. The job is a small building with a 5-ton cooling unit. Bob went to the outdoor unit. It was running and all appeared normal. He went to the truck to get his gauges, and when he got back, he noticed that the compressor didn’t seem to be running.
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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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