What exactly is a digital multimeter (DMM) and what can you do with it? How do you make measurements safely? What features do you need? What's the easiest way to get the most out of your meter? These and other questions are answered in this article.
In this edition of the Btu Buddy series, Bob goes on a call where an oil furnace won't always start. He discovers heavily sooted electrodes. Btu Buddy assists him in servicing the burner and cleaning the electrodes.
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.
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.
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.
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.