Articles by Bill Johnson

Btu Buddy 100: Dual-Voltage, Nine-Lead Motors

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 98: Compressor With Internal Leak

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 96: Motor and Circuit Protection

Bob and Btu Buddy were on a service call yesterday where the compressor motor was running overloaded due to internal load; the bearings were dragging or worn. Btu Buddy told Bob, “Motor overload protection and circuit protection are subjects that need to be discussed later.” They’ve gotten together today for that discussion.
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Btu Buddy 95: Compressor Motor Overload

Bob got a call from the dispatcher to go to an office building that has a 3-ton heat pump compressor that has been shutting off after startup. The fan would continue to run. The building maintenance man said that he had observed the shutting down of the compressor several times.
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Btu Buddy 93: Pneumatic Controls Review

Bob and Btu Buddy have gotten together for a review of their last service call, which involved a control system that Bob was not very familiar with - pneumatic controls. Bob asked, “Why would anyone want to use air as the power source to operate the controls for a building?”
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2014 World Energy Engineering Congress

Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.

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NEWSMakers: Greenheck Mixed Flow Fan, Model EQB

Shane Dock, Application Engineer at Greenheck, will introduce you to Greenheck’s new EQB mixed flow fan. We’ll discuss what the features of the EQB’s innovative design, what kinds of applications can utilize the EQB, and why the EQB is an attractive inline choice for your customers’ projects.  Dock is currently focused on applications regarding inline fans, gravity ventilators, and electrical products. Posted March 4th.

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