April 26th, 2010 
admin I tour a vav box.
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chevy s 10? whares my rocking chevy van creaks and rattles and all:)
whares the cover for the control box ?
and ya like putting youre fingers a little close to the power termanals dont ya:)
we dont need a charge out of jim vidoe:)
good vid but i would like to know more on them.
Thanks. I do plan to make more VAV videos.
I took it off for the video.
It’s hard to keep the camera steady in my work truck. lol
Thanks. I do plan to make more VAV videos.
The school board has many types of VAV systems. Some have the chillwater and hot water from the boiler going to them. Some have just the hot water going to them. This one is about as basic as they come.
Does it have t-stat or t-mister on the board (or inside cabinet) if not what controls it?
excellent, thanks.
Hi Dr. Z just found your videos, I’m going to school right now on HVAC-R and was wondering do you just make videos on A/C and Refrigeration or do you do Furnaces to?
good call, i think i would have used a pencil or something. i was thinking – what if he sneezed or had a spasm from breathing in too much R22 over the years !
i m an hvac technician as well i do mainly comercial resturants what would you need a vav box for and how does it work
which university did you go to?. I’m an associates graduate but the only HVACR univercity i know is Ferris State in Michigan.
In Canada it’s a bit different however I attended NAIT ( Northern Alberta Institute of Technology) and have an HVAC Diploma.
It has a t-mister in the duct. I’ll have to include that in my next video.
nice video dr. z
never see that before
I was hoping you’d do a VAV show! My facility has even more basic boxes because it’s in Hawaii and doesn’t need the heating function. I spend alot of time in the ceiling with them because the volume dampers are underdesigned for the operating pressure in one building and continually blow the damper apart or even strip the damper shaft from the armature collar.
I’ve learned a lot of ways to jury rig them until the HVAC techs show up! I dread that banging sound in the ceiling.
ballejos, the Good Dr. could answer this better, but basically a VAV box is used if you have a building with many zones with different heating or cooling needs that are served by one air handler. The VAV box controls air volume to a zone and branch ducts from it have smaller dampers that restrict or bypass the air to an indivudual room.
So the supply air temperature from the air handler is constant when cooling, and the ‘temperature’ is controlled by changing the air volume at the box and dampers.
I feel you pain. I wish the engineers would figure out a different way to install the VAV boxes. Cramped ceilings are painful.
Hi Dr.Zarkloff!!
I am learning HVAC, a bit old student but I love it. Your video has helped me very much! Thank you for all your uploads on the videos. I visit your site everyday to learn, and while I am at it, I click on the ads too. Do you answer to questions if I post them? Your videos are really great and you explain it so well. Thank you again! Have a great day
Thanks for watching and clicking on the ads, too.
very good vid, i had to subscribe to your channel. i wish you would have explained the control board in detail on this vid. id like to know more about the ac – dc or dc – ac, opto’s and bridge rectifiers etc. im 25 btw, and only a little over a year into the service side. i love hvacr, just right now its not paying to good. have to start from the bottom i reckon.
@death2opposeme Thanks for watching. I’ll try to do a more detailed video on the control board some time.
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