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Servicing Thermostatic Expansion Valves

April 3, 2006
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The thermostatic expansion valve (TEV or TXV) is erroneously considered by some to be a mysterious and complex device. Here we discuss typical valve complaints, causes, and remedies.
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Btu Buddy 36: High-Efficiency Cooling in Mild Weather

March 20, 2006
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In this installment of the Btu Buddy series, Bob finds that a customer's heat pumps are losing cooling capacity operating in mild temperatures. With Btu Buddy's help, he discovers that the units' evaporators are starved for refrigerant.
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Quick Facts: TXV Selection and Sensing Bulb Location

March 6, 2006
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Learn how to select a thermostatic expansion valve (TXV) for a particular application and what is the correct position for the TXV sensing bulb.
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Btu Buddy 35: Heat Pump With a Stuck Check Valve

February 20, 2006
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In this edition of the Btu Buddy series, a customer with a heat pump is seeing his auxiliary heat light stay on almost all the time. With Btu Buddy's help, Bob finds that a check valve in the refrigerant circuit is stuck open.
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Troubleshooting the Refrigeration Cycle for Mechanical Problems

February 6, 2006
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This article describes how to troubleshoot a compressor and the associated problems that can cause a system to fail prematurely. It discusses the proper methods of diagnosing and repairing system problems.
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Btu Buddy 34: Handling A Stopped Up Oil Filter

January 23, 2006
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In this installment of the Btu Buddy series, Bob services an oil furnace and discovers a plugged up oil filter. Btu Buddy explains the cause of the problem and assists him in correcting it.
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Creating A ‘False Water Line'

January 9, 2006
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The next time you're faced with replacing an old steam boiler that was attached to a two-pipe air vent system, try the old-timer's trick. Remember that the replacement boiler is smaller in size and holds less water, thus requiring a boiler feed tank that acts as a reservoir for the new boiler.
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Btu Buddy 33: Frozen Heat Pump Outdoor Coil

December 26, 2005
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In this edition of the Btu Buddy series, the dispatcher calls Bob and tells him a customer has a very frozen heat pump outdoor coil. After checking out the unit, Bob finds a bad fan capacitor.
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Servicing Gas Appliances – Part 3

December 12, 2005
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This article is the third and final part of a three-part series on inspecting and servicing gas appliances. It provides information on furnace operation, combustion analysis, and the limit circuit.
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Btu Buddy 32: Carbon Monoxide Problem With Gas Furnace

November 23, 2005
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In this installment of the Btu Buddy series, Bob goes on a call where a carbon monoxide detector alarm is sounding off. He finds that a fireplace is contributing to the problem.
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