The Danger of High Airflow in HVAC

all the time on this channel we're talking low air flow issues coils freezing up and all sorts of stuff like that but what about high air flow what is the problem with high air flow that's more sensible cooling right the more air flow you can put across that coil but there's issues with that just like there's issues with low air flow the new yellow jacket scale part number 68 864 has a 220 lb capacity a large platform and wireless Bluetooth communication via the wide Jack app with a 05% accuracy and 2 out resolution service technicians can count on Precision measurements every [Music] time let's imagine for a minute we have a coil that's 3 tons that's designed for 1100 CFM to move across it just as an arbitrary we're going to grab a number nominal CFM for a 3 ton is 400 per ton at 1,200 but a lot of times they run a little bit lower and there's a reason for that in fact a lot of times whenever systems are evaluated for efficiency they run at a higher CFM than you actually would run them installed at somebody's house because the higher that air flow goes the higher that coil temperature will will go and there's a problem with having a higher coil temperature the higher the coil temperature is the less likely you're going to get the proper amount of dehumidification because there's kind of a give and take on an air conditioner coil between sensible Cooling and latent cooling you can change the balance of sensible to Laten cooling by changing the CFM of a system if a coil gets colder the colder it gets the Mortal dehumidify to a certain point but you'll have less total cooling because as you decrease CFM you can only offer a certain amount of sensible cooling to the structure so there's always a give and take and you have to analyze what CFM you're at the reason why I'm talking about this is when you have a matchup of different systems and you have to fine-tune them at the installation process a lot of times guys will Overlook CFM Al together they'll fire it up if the pressures look relatively good you'll say perfect you let it go we don't do a whole lot of testing out there especially at summertime everybody's under the done everything seems to be working we'll come back and check it later and of course later never comes it's like 5 years later whenever you have to service it for some reason but if you have excessive CFM they might reach the temperature on their thermostat let's say they set their thermostat at 75 which a relatively High number these days is what I found it gets to 75 but because that CFM is higher than it should be there's not enough Laten cooling so the room still feels sticky and humid they have to run it down to 70 2 and maybe to 70 and the unit ends up being less efficient because they had to run it down lower and maybe their bills even higher than before the unit was installed and then you get some complaints at your company because you thought it was a 16 or 18 Seer and now it's costing more why is this happening that fine-tuning at the installation process makes a big big difference fine-tuning to CFM testing it or going through the proper process on a variable speed of communicating system to ensure you have the correct CFM is Paramount it can change how people feel in their homes dramatically I know when my home is more humid it just feels uncomfortable even though the thermostat may say 70° if it's humid inside it's uncomfortable I run a fan but if dehumidification has taken place and our humidity is down let's say at 45 or 50% and at 73 or 74 it feels more comfortable than it did at 70° like a 65% humidity it's just it feels clammy and disgusting whenever you have a humid house so you should avoid that and you avoid a few things by doing that you avoid somebody calling back shortly after you avoid just a constant because people don't like to call and complain about stuff some people do some people don't a lot of people don't but those people who don't will just have that system and dislike it and Associate you with that dislike and you don't want that that's the silent thing you don't get to see if you do a bad job and we'll say an incomplete job I hate to say a bad job because it's it's not the right word for it but if it's incomplete job and people have to deal with this day in and day out they don't make that phone call but they also never call you back again because they said that system you put in it feels worse than the old one so do it right the first time and you can avoid some confrontations and some just loss of business that you never even knew about but I hope that helps everybody testing is important testing CFM is very important and it's underdone in the industry as far as I could tell my name is Zach siotto with HVAC shop talk I hope I see you guys on the next one and God bless all of you save 8% off your order at trch tools.com by using the shop talk discount code

Channel: HVAC Shop Talk

Views: 7,774

Keywords: zack psioda, talyn875, power tools, tool reviews, 12 volt tools, 20 volt tools, 18 volt tools, 40 volt tools, best circular saw, best jigsaw, best reciprocating saw, best drill, best impact driver, best impact wrench

Id: TjHoqdTpGvI

Length: 5min 19sec (319 seconds)

Published: Sun May 26 2024