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by Jim Davis
The primary goal of combustion testing is to take readings you can trust so you can evaluate the operating condition of the combustion appliance. In order to take readings you can trust you have to be sure your combustion analyzer remains in tip-top shape. The...
Duct renovators can be entry-level employees that don't have any previous HVAC experience. What's needed are a fair driving record, a clean drug test, physical ability, good people skills and the ability to learn and follow instructions. As you consider making this...
Nearly all systems are in need of air-side and combustion diagnostic, but getting permission to test the systems, and getting the customer to agree to pay for repairs requires more than technical genius. We asked a number of successful NCI Performance-Based...
by Jim Davis
Combustion air testing is performed using a draft gauge and a CO analyzer. When the draft in the flue of an appliance is low or below -.01" to -.02" W.C. and when CO reading are rising, combustion air problems are present. Carbon Monoxide diagnostics consistently...
by Jim Davis
The procedure and purpose for adjusting barometric dampers for gas appliances is completely different from the reason you adjust barometric dampers on oil equipment. Let's take a look at each method to get a clearer picture of what we're trying to accomplish. OIL...
The quest for higher efficiency cooling equipment is hitting a barrier. Unsuspecting installing contractors are being handed hidden liability that is difficult to identify and resolve. Certain cooling coils are being built for the highest possible SEER rating, but...
How Does Air Balancing Save Energy? by Rob "Doc" Falke, President, NCI Air balancing is a relatively small specialty profession with less than 3,000 commercial supervisors certified by four major organizations. There are fewer than 7,000 residential balancing...
A substantial amount of the work many of us do is based on a fixed price quote, taken from a predefined scope of work. Plan and spec work has, just as the name implies, a set of plans and specifications that we are bound by contract to follow. But what happens when...
by National Comfort Institute, Inc.
Airflow is critical to proper heat transfer in heating and air conditioning systems. Most of us know the rule that temperature drop over a cooling coil should be 18 to 22 degrees. If the temperature drop increases, it is evidence that airflow is low. If the...
by David Holt
Honest Abe Wouldn't Guess: He'd Measure by David Holt The measure of a great country are the people who lead it. Each February, the United States of America celebrates the birth of our greatest -- the 16th President of the United States -- Abraham "Honest Abe" Lincoln...
