Service & Maintenance

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

August 22, 2011
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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Beyond the Flange

August 8, 2011
In a previous article on chilled water systems we focused on maintenance of the “heart” of the system, the chiller.


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

July 18, 2011
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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Troubleshooting Challenge: An Ongoing 'Not Cooling Enough' Complaint

July 4, 2011
In this troubleshooting situation you have inherited a service problem that goes back to last year’s cooling season… residential HVAC equipment that’s seven years old with a lot of history, and repeated trips in response to complaints that this split system that employs a horizontal, attic-installed gas furnace “just won’t keep the home comfortable.”
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Btu Buddy 99: Large Compressor Motor Grounded

June 20, 2011
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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Troubleshooting Power Problems on HVAC Equipment

June 6, 2011
A variable frequency drive (VFD) fails to vary the discharge-air fan speed. A motor overheats and fails prematurely. While each troubleshooting problem in an HVAC system presents its own unique set of circumstances, HVAC professionals may recognize such problems as possible power quality issues.
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Btu Buddy 98: Compressor With Internal Leak

May 23, 2011
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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Troubleshooting Challenge: A Tavern Owner's Request for a Second Opinion

May 9, 2011
This month’s troubleshooting situation involves an under-counter refrigeration unit in a commercial application. The first technician explained to the customer that the compressor needed to be replaced. After that technician left, the customer called the office to request a second opinion.
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Btu Buddy 97: Defective Compressor or Four-Way Valve Problem?

April 18, 2011
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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Air Conditioning Coil Cleaning

April 4, 2011
Air conditioning coil cleaning is an important air conditioning maintenance procedure that sometimes takes some patience, and usually takes a lot of water. First, you have to make some common sense evaluations.
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