This application note was written to provide you with an understanding of the basic principles of fossil fuel heating systems and how to troubleshoot these systems using thermometers, digital multimeters, pressure/vacuum modules, and other accessories.
A feature story in the Dec. 1, 2003, issue of The News dealt with air conditioning system diagnosis. That article focused on airflow problems. This article concentrates on refrigerant flow problems.
Pulling a good vacuum before charging a new system with refrigerant or after a repair is essential for the proper operation of an air conditioning system. In addition to the vacuum pump, a micron gauge is an essential tool.
With one end of the building cool and one end warm, Bob and Btu Buddy discover an airflow problem. Find out how they track down the problem and repair the system.
Many building codes in the southeastern United States call for increased attic and crawl space ventilation to fight moisture and related IAQ problems. Craig DeWitt, Ph.D., P.E., challenged that notion at the South Carolina Association of Heating and Air Conditioning Contractors' (SCAHACC's) 2003 Indoor Comfort Science Conference.
Most hydronic systems are filled with "Plain Jane" tap water. However, today, more than ever, "Plain Jane" water may not be so plain. If you are not testing your fill water, you are guessing, and potentially compromising, the system.
The trend towards the use of refrigerant 410A continues to grow and there is a demand for technicians who are comfortable working with this higher-pressure replacement for R-22.
Many refrigeration compressors incorporate a suction service valve and a discharge service valve. Working with these valves is not difficult, but there are some finer points to remember.
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