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by National Comfort Institute, Inc.
We've all heard our customers describe how their air conditioning system works O.K. in the morning, but doesn't deliver enough cooling in the afternoon. We send out a service tech, he services the unit and reports it's working pretty well. End of story, except our...
To understand airflow, you need to have a firm grasp of the rules driving airflow characteristics and behaviors. What you’ll find is many of the most complicated issues you encounter often tie to an airflow problem. Let’s look at five airflow rules that can help you master the airside of your profession.
by National Comfort Institute, Inc.
Alan Fisher, President of FisherAir Heating and Air Conditioning Services in Brea, California, was one of the first technicians certified by the National Balancing Institute (now National Comfort Institute) in the early 1990’s. His company has kept the flame burning ever since.
It's 30 degrees outside and the heat pump is running. Let's say it's a 3 ton unit. What airflow should the equipment deliver through the system and what should the BTU output of that system be under current weather conditions? Last month, NCT included a HeatMaxx...
by National Comfort Institute, Inc.
There's a fast test for a new installation that is highly accurate and takes just a few minutes. You can get system CFM by measuring pressure drop over a new coil. You simply plot the pressure drop on the coil engineering data sheet and read the airflow passing...
Do You Know How External Filter Racks Impact Total External Static Pressure? A few weeks ago I was asked a question about finding the proper location to obtain the entering static pressure reading on an upflow gas furnace using an external filter rack. This is one of...
by National Comfort Institute, Inc.
Chris Farris, Farris Electric, LLC in Durant, Oklahoma is NCI’s November Member of the Month.
Many members called our tech support line this last month as you've shifted gears to test in heating mode. A large number of the conversations have been about sizing heating equipment and how to estimate room heating airflow. So let's get back to the basics and review...
An essential part of diagnostic testing is communicating your findings to your customers. Your success will be in direct proportion to your ability to help them understand the impact of system performance on their comfort, pocketbook, health and safety. Back when...
by Jim Davis
Should I use Natural Gas or Heat Pump? What about Oil or Propane? What is the most efficient way to heat your home? To begin to make these decisions we must first look at the difference in fuels and what quantity of each fuel it takes to produce a certain amount of...
