Articles Tagged with ''service and maintenance''

Testo Inc.: Combustion Analyzers

January 14, 2013
Two combustion analyzers, models 310 and 320, can be used by HVAC techs for residential tuning and commercial applications. The 310 is a residential analyzer designed to measure flue gas, draft, ambient CO, and pressure, while the 320 is for residential and commercial boiler/burner tune-ups, service, and maintenance.


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Btu Buddy 115: No Cooling Call, Condensate Problem

October 22, 2012
Bob and Tim have arrived at a “no cooling” call at a commercial building location. They went first to the thermostat and noticed that the indoor fan was running, but there was no cool air coming out of the air registers.


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The Professor: Frosted Compressor Head

September 3, 2012
Many service technicians believe that frost on a suction line or on the compressor’s head itself indicates there is liquid refrigerant coming back to the compressor. Is this really true? 


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Btu Buddy 113: Restriction in the Liquid Line Problem

August 20, 2012
Bob and Tim have been sent on a call to a house with no cooling. The system has just been installed and the construction crew has been having problems with startup. The system has a capillary tube metering device and Bob and Tim begin looking at what may be wrong.


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Btu Buddy 112: Too Much Load for Air Conditioner

July 23, 2012
Bob and Tim were on their way to a residence where the occupants said their unit runs all day long, but the space temperature rises to 82°F while the thermostat is set at 75°. The unit shuts off during the night and the temperature inside is 75° in the morning, but during the day it rises.


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Btu Buddy 110: Burned Hermetic Compressor - Part 1

May 21, 2012
Bob and Tim were on their way to a no cooling call at a commercial building. When they arrived, they talked to the building manager and checked the thermostat. It was set at 72°F but the thermometer was reading 78°. Tim said, “The fan is running, so there is control voltage and the thermostat seems to be calling for cooling.”


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Btu Buddy 109: Preventing Copper Theft

April 23, 2012
Bob and Tim were just finishing a service contract call when they were contacted by the dispatcher about a no cooling call at a new installation at a small retail store. The weather was unusually warm for this time of the year.


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Explaining Grooved Mechanical Piping

March 19, 2012
Grooved mechanical piping has been changing the way contractors do business for more than 85 years, but this method of pipe joining is still unknown or misunderstood in some areas of the commercial building industry.


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Ice Breaker: Tips for Avoiding Callbacks

February 6, 2012
Contractors do not like to hear the word “callback.” They cost money and degrade a customer’s respect for and opinion of the service contractor. So how can a technician reduce the number of times he must revisit a repair? 


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Learn to Think Like Steam and Air

January 23, 2012
Years ago, in some dank basement, a contractor installed a large air vent near the end of a steam main. Why did he do that and what happened? Read to find out.


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