Service & Maintenance

Btu Buddy 103: Bob and Tim Begin Heat Pump Repairs

October 24, 2011
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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Kitchen Ventilation: Baffled by Filters?

October 10, 2011
It is important to understand grease extraction and new options in capturing grease particulate efficiently near the source. A commonly overlooked byproduct of many cooking processes is grease — overlooked, that is, until it causes problems at a restaurant facility.


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

September 19, 2011
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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Troubleshooting Challenge: A Heat Pump That Won’t Cool

September 5, 2011
In this troubleshooting situation, the equipment you’re servicing is a 240-volt, single-phase split system in a small office, and the customer’s complaint is that the system is blowing warm air.


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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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