Articles by Bill Johnson

Btu Buddy 142: High Power Bill with a Heat Pump

Bob and Tim were on their way to a service call where the customer is complaining about a high power bill. She said the heat pump that they use for their heat is running all the time and their power bill is really high.


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Btu Buddy 141: Seasonal Service on a High-Efficiency Gas Furnace

Bob and Tim were doing a routine seasonal service call on a high-efficiency furnace. Tim asked, “Why were the older furnaces so inefficient compared to the more modern furnaces?”


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Btu Buddy 140: Seasonal Service on a Gas Furnace and Humidifier

Bob and Tim were on their way to do routine annual service on a customer’s gas furnace and humidifier. Tim asked, “What are the things that we should look for that may cause problems on a gas furnace?”


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Btu Buddy 139: An Overcharged System - Part 2

Bob and Tim were at the shop after a day of service calls. The weather was still hot, 93°F, and Bob said, “We just did a service call with a system that was overcharged and had an orifice expansion device. I would like to go into further details with you on a system with a thermostatic expansion valve (TXV) for an expansion device.”


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Btu Buddy 138: An Overcharged System - Part 1

Bob and Tim were on their way to a service call with a new customer. When they got to the job, the customer explained, "The unit was not cooling and I had a company come out for a service call. The unit seemed to work OK last week when it was a little cooler outside, but this week it has warmed up and the unit is not functioning as well."


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Btu Buddy 137: Heat Pump Problem in the Summer

Bob and Tim were on their way to a no cooling call; in fact, it sounded like a heating call. The customer has a bonus room on the third floor that used to be attic space. When Bob and Tim arrived, the customer told them, “The bonus room upstairs seems much too hot and the air coming out of the registers is hot to the touch.”


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Btu Buddy 136: Water-Cooled Chiller Problems - Part 2

Bob and Tim were getting set up to clean the condenser tubes in a chiller. They were doing this job at night during overtime hours because they discovered the problem earlier that afternoon and the customer said the chiller needed to be able to operate at full capacity tomorrow for a conference.


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Btu Buddy 135: Water-Cooled Chiller Problems - Part 1

Bob and Tim were on their way to a no cooling call at an office building with a 100-ton water-cooled chiller. As always, management was in a hurry to get the problem solved because the tenants were hot.


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Btu Buddy 134: An Unusual Service Call

Bob and Tim were on their way to a no cooling call. The spring season was still cool at night and warm in the daytime. The customer told the dispatcher, “The unit started up at about 10:30 a.m. this morning and made a noise, but did not cool the house, even though it is still running.”


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Btu Buddy 133: Evaporator Coil Freezing, Low Ambient Problems

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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NEWSMakers: Jim Johnson

Jim Johnson,an experienced trade school and community college instructor, discusses the HVAC industry and his column in The NEWS, ‘The Service Ticket.’ Listen now for a hint to the Not Enough Heat question from the Dec. 15 issue. Posted Jan. 30.

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2015 January 26

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