HVAC - Direct Fired Make Up Air Unit
When it comes to make up air units, there are a couple of different types. Direct fired, like in the video, and indirect fired. HVAC technicians should be aware of the difference. Direct fired make up air units have the burner mounted in the air stream, the products of combustion are dumped into the space. DF units must be mechanically interlocked with an exhaust fan(s) and are commonly used in kitchens and warehouse applications. Indirect fired make up air units use a burner assembly that includes a heat exchanger, a common application for this type of unit is in multi story buildings for pressurizing hallways. Happy HVACing
**Save 8% on your purchase at www.trutechtools.com using promo code "knowitall" at check out. See below for preferred Testo pricing.**
docs.google.com/forms/d/e/1FA...
Visit www.hvacknowitall.com fir articles, tips and tool reviews.
Listen to the HVAC Know It All Podcast here.
Check out my podcast, HVAC Know It All Podcast, on Anchor: anchor.fm/hvacknowitall
Пікірлер: 41
To the point and informative, no fluff. Right on brother.
Thank you for actually showing each component and explaining in detail. I've seen videos similar to this with no in-depth explanation.
Ehh. I spend a full day changing filters on those exact units. Them things are crazy cool. Can’t wait to learn more about them
@HVACKnowItAll
5 жыл бұрын
awesome good shit
Cristal clear explanation Gary. Thanks for posting.
@HVACKnowItAll
5 жыл бұрын
Thank you and you're welcome
Dope video brotha thank you 🙏
@HVACKnowItAll
5 жыл бұрын
thank you!
Thank you for making best info video then rest, I have similar one in my facility and today, it got flame failure error and I resetted twice, so I have to open Burner door and clean flame rod after that fire it again and it's worked after since, can you please make a video how to change damper actuator, please and thankyou, keep up the great work bro.
Great video!👍🏼🤘🏼✌🏼
Old school dfnp-20 nice
Good video, thanks for sharing.
@HVACKnowItAll
5 жыл бұрын
you know it!
Thank you for the video! Question: when and if the flame stops, is it whenbit reaches the set temp. Inside?
great video I had a very basic understanding about how these units work. This was straight to the point and very informative.
@HVACKnowItAll
5 жыл бұрын
thanks buddy!
This roof look so much similar to my previous work place. It this site in Mississauga?
Thanks!
Code in Canada states filters are to be metal frame. If the cardboard gets wet or plugged they can be sucked into burner and set fire.
@HVACKnowItAll
3 жыл бұрын
What code book is this in?
Hello Just a brief suggestion it is possible you air pressure differential switches are no set up correctlly unless you had the low jumped out. The reason I say this is normally the flame should drop out on low differential if the door is that wide open. Good video
@HVACKnowItAll
5 жыл бұрын
Thank you, the door was actually only open a few inches at the top just to stick the camera in. But yeah you are 100% correct.
Very simple and robust design. Alot of this equipment is very simple if you are mechanicaly and electrically inclined 👍😀
@HVACKnowItAll
2 жыл бұрын
Yes for sure, thanks for the comment
How many BTUs does that burner make and what's the combined CFM of the exhaust fans? Looks like a clean burning flame for so much turbulence.
@HVACKnowItAll
5 жыл бұрын
Sorry, I don't actually have the cfm info, we didn't design or install the equipment. I can't recall the btu rating on that lol, sorry not much help am I.
Awesome video! I myself am a Contractor who works In Ontario, Canada. Where are you located and are you self employed? Good explaination of how everything works!
@HVACKnowItAll
5 жыл бұрын
Hey Michael, not self employed, most of my work is out of Mississauga
@michaelmead5880
5 жыл бұрын
@@HVACKnowItAll Right on! Good to see another competent Tech around. Are you mainly commercial service?
@HVACKnowItAll
5 жыл бұрын
@@michaelmead5880 yes pretty much
Those burner eye windows are useless in those places, yes you can see flame sometimes but you can't see the full length of the burner, especially for setting low fire. Captiveaire does this, 👍, Engair junk does not amongst others.
@jonminnella4157
3 жыл бұрын
I know such a piss off thy should make a better system
#Dopeness
@HVACKnowItAll
5 жыл бұрын
#makeupdopeness
At 00:38 it’s not an Economizers and at 01:15 the vertical filter position provide better static pressure since it’s in a vertical position and is more rigid.
@HVACKnowItAll
5 жыл бұрын
Who said it was an economizer?? The filters definitely have better structure in vertical position, what do you mean by "better" static pressure? If you mean lower, I haven't seen any evidence to support that even with a magnehelic attached.
@ronpowdrell6608
5 жыл бұрын
Texture6. On a make up air unit we don’t worry about static pressure cause there is very little duct work attached. Economizers are attached to a package unit to provide free cooling. It’s controlled by temperature/empathy control.
@texture6
5 жыл бұрын
Ron...Thank you I appreciate
I can’t ur voice because Background music
@HVACKnowItAll
5 жыл бұрын
I can hear my voice just fine...There a couple times when the wind is strong but that's life in HVAC
Hipster music