Articles Tagged with ''maintenance''

Ice Breaker: Read and Record

July 4, 2011
When a refrigeration system fails, many times the cause can easily be diagnosed. However there are occasions when the cause cannot easily be determined - either the true cause is unclear or the technician is unsure of a problem. How do you work through these jobs? One method used by some techs is to “read and record.”
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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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Commercial Service Goes National

May 2, 2011
The poor economy has been hard on commercial businesses. In some cases, HVAC contractors still have service agreements with local malls and office buildings, but often, that work is being outsourced to national maintenance organizations. HVAC contractors have partnered with these organizations. Some sing their praises while others now turn and run.
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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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Ice Breaker: Testing Your Tools to Make Sure They Work

April 4, 2011
Accurately troubleshooting and repairing refrigeration systems requires technicians to use many specialty instruments. They base many of their diagnoses on what is read from these instruments. Relying on them to be consistently accurate day in and day out is a must. If these tools are inaccurate, more than likely the diagnoses will be inaccurate.
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The Professor: More Ice Flake Machine Troubleshooting

April 4, 2011
This article is part two of a two-part series on ice flake machine troubleshooting.  The last article, which appeared in the Feb. 7 NEWS, examined troubleshooting low and high water levels. This article will examine water impurities and mechanical problems.
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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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Tune Up Your Cooling System Now

March 21, 2011
When the weather is warm outside, it’s imperative to make sure that your building’s mechanical cooling systems are working at maximum efficiency. Since budgets are still tight, nobody wants high energy costs or, worse, an equipment failure. The best way to avoid these bad scenarios is to perform a cooling system tuneup.
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Btu Buddy 96: Motor and Circuit Protection

March 21, 2011
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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Ice Breaker: Tricks of the Trade

March 7, 2011
While repairing refrigeration equipment, technicians sometimes come up with unique methods of solving problems. Many of these are used again and again and become known as “tricks of the trade.” When a bunch of technicians get together, they oftentimes enjoy sharing new tricks they learned or developed recently. It’s like a badge of honor.
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