Articles Tagged with ''maintenance''

The Professor: Compressor Amperage Data

March 7, 2011
My Feb. 7 column focused on ice flake machine troubleshooting. I will have more to say on that specific topic in my April 4 column. For this column, I want to take a look at amperage as it relates to HVACR compressors.
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Troubleshooting Challenge: A Rooftop Unit That Won't Shut Down

March 7, 2011
In this month’s troubleshooting situation, our customer has called to say that the older package unit that heats and cools his office is managing to warm up the area, but then seems to cool down too much before providing heat again. When you arrive, the first thing you note is that the indoor blower motor is operating, and you check the fan switch setting on the thermostat.
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Btu Buddy 95: Compressor Motor Overload

February 21, 2011
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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How Listening Could've Saved Me My Eyebrows

February 14, 2011
In my mind, there wasn’t much the residential market could throw at me. I should have guessed something was up by the half-amused look on my customer’s face when he described the problem as “a real hair raiser,” and that a measure of caution was in order … but what could be dangerous about a small furnace?
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HVAC and Plumbing Tips for Building Maintenance

February 7, 2011
Here are some tips for HVAC and plumbing systems maintenance in commercial buildings that will help mechanical contractors and their customers save time and money.
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Ice Breaker: Oil Management

February 7, 2011
When multiple compressors are piped together with a common suction and discharge header - such as with the arrangement of a parallel rack configuration - oil return to each compressor is a major concern. Typical oil recirculation rates are dependent on three factors.
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The Professor: Ice Flake Machine Troubleshooting

February 7, 2011
This article is part one of a two-part series on ice flake machine troubleshooting. This article will examine troubleshooting low and high water levels. Next month’s article will examine water impurities and mechanical problems.
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Btu Buddy 94: A Heat Pump That's Not Getting Up to Temperature

January 24, 2011
Bob has gone on a service call where the customer is complaining that her house is not getting up to temperature. The house was heated with a heat pump with three stages of auxiliary strip heat. Bob removed the panel to the strip heat and found one of the units was not pulling current.
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The Professor: Restricted TXV Metering Device

January 17, 2011
This article explores how a restricted metering device will affect system performance and efficiency. The system is a commercial refrigeration system with a TXV as the metering device. The refrigerant being used is HFC-134a. Very similar results will occur if an automatic expansion valve (AXV) is used.
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Ice Breaker: Generic Refrigeration Maintenance Tips

January 17, 2011
The actual frequency and tasks performed will vary from system to system. However, here are some generic maintenance tasks which can be applied to many refrigeration systems. These tasks can be divided into two groups: one for maintaining the cabinet and one for maintaining the refrigeration system.
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