Key System Performance Factors - Short 124

HVAC School - For Techs, By Techs

Bryan Orr

Careers, Business, Self-improvement, Education

4.9 • 1K Ratings

🗓️ 27 July 2021

⏱️ 14 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In today's short podcast, Bryan discusses the key factors for system performance WITHOUT doing a deep dive into system commissioning. "Performance" refers to system efficiency, capacity, air filtration/cleanliness, longevity, and the ability to match the latent and sensible loads of a space.

System airflow is the main performance factor to consider. To determine proper airflow (CFM), consult Manuals S, J, and D to perform calculations. In general, the absolute lowest limit is around 275 CFM (in extreme dehumidification mode), and the highest limit should be around 525 CFM (in arid climates or at altitude).

You can determine your CFM target after you set up your ECM motor in the design. Then, you can also check airflow indicators: total external static pressure and pressure drop across the filter. The best way to improve airflow is to reduce pressure drop across the filter and build a better return plenum. For improving overall system performance, make sure the ducts are appropriately sized.

System charge is another important performance factor. There is a lot more to evaluating charge than checking the superheat and subcooling. If possible, it is a good idea to weigh the charge with a scale and see how it matches up with the line length.

In terms of long-term performance, the condenser's location and cleanliness are also vital. Overall, a condenser works best if you put it in a slightly shaded area or on the north/east side of a building. The outdoor unit should also have some clearance from bushes and walls. Make sure the condenser is positioned away from pool equipment, water softener discharge, and dryer vent discharge. The goal is to keep the outdoor unit corrosion-free and able to "breathe."

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Transcript

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0:00.0	Hey, this is in HVAC School, exclusive, hard-hitting short episode.
0:12.0	That voice just happened midway through recording this. I wasn't even tending on doing that. It just happened sometimes. I can't help it.
0:18.5	This episode we're going to talk about key performance indicators,
0:22.7	performance factors, things you can do in order
0:26.7	to make equipment perform better, both
0:28.3	in the design service and installation side,
0:30.6	that are not just sort of like made up and extra things. We're going to focus on some really practical things.
0:35.5	You can focus on that maybe you don't think about every time.
0:38.0	Sometimes maybe you do, but some of them will be obvious, some of them might be less obvious,
0:42.0	but it's short so you can
0:43.9	deal with it. And first off we have to thank our amazing sponsors.
0:48.6	Field Piece and Field Piece. Field Piece makes so many great tools that it's hard to mention them all but they do have a new large pipe clamp that you're definitely going to like it goes up to four inches and it works great if you are in the more industrial sides of our industry. Very very accurate. great out more by going to Field Piece.com. Big thanks to Zoa and Haven IAC to learn more about their
1:16.8	innovative indoor air quality measurement solutions that work for contractors and
1:22.4	their customers. to haven IAC.com
1:27.0	Refrigeration Technologies at Refriggedec.com
1:31.0	carrier and carrier dot com Navac and carrier dot com
1:33.6	navac and navag global.com if you haven't taken a look at the NRD
1:37.6	C4M recovery machine it is a four cylinder recovery machine literally the fastest recovery machine that you're going to be
1:44.8	able to buy from a supply house is the NRD C4M you can also find it at truetech tools
1:50.1	com use the offer code get schooled for a great discount at checkout if you are in the
1:55.2	commercial side or industrial sides of the industry especially you're going to
1:58.2	want to take a look at the NRD C4M from Navac.
	...

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