David Richardson serves as a curriculum developer and trainer at the National Comfort Institute (NCI). NCI specializes in training focused on improving, measuring, and verifying HVAC and building performance. Contact him at 800-633-7058 or at firstname.lastname@example.org.
For decades, many company business models have remained the same. Run service calls one after the other, and fix or replace the equipment. This often results in companies barely surviving and a bleak outlook on the future.
There is a formula that successful contractors use to answer such questions and generate customer interest in duct upgrades. Their approach focuses on the facts about what an HVAC system is doing — they don’t share opinions or use smoke and mirrors.
The good news is that once you measure static pressure, you can estimate fan airflow in less than 30 seconds with the right information. Once technicians understand that static pressure testing gets them to fan airflow, they will see why it is important to measure it on every call.
Airflow is a general term that’s easy to misinterpret. When I first learned about airflow, I had to classify it into four values that made sense to me. The easiest options are the measurement location or source of the airflow reading.
The first reason not to measure static pressure is because hooking up a refrigeration manifold to the system tells you everything you need to know. Don’t worry about the fact that this practice often leads to leaks, can introduce non-condensables, and can cause potential refrigerant contamination.
Several months ago, I wrote a Duct Dynasty article titled “Four Steps to Optimize a Duct System.” Since then, I’ve received numerous requests to expand on the simple calculations I mentioned that can help you estimate room airflow with a customer’s input.
It seems our industry is becoming “commoditized,” and we are unintentional accomplices. We’re too comfortable swapping equipment and installing silver bullets while moving away from providing true comfort.
The AHR Expo is the largest event in the HVACR industry, offering educational sessions, award-winning products, and networking opportunities galore. It’s impossible for attendees to see everything, but you can check out some of the highlights in this issue of The NEWS.