HVAC VAV boxes 2

[erd675]

one thing about this line of work is the job could be easy,hard or real pain in the butt.

[DrZarkloff]

@erd675 Amen to that.

[death2opposeme]

great vid!!!! damn and not only the actuator, but why are units always directly over a durn light fixture. onetime i had one up in the ceiling tile, access panels face down, and was like two inches over a light. i was like yo, call so and so move the light over a foot or so. in-accessable, we'll come back later.

[DrZarkloff]

@death2opposeme lol. I feel your pain.

[acechoice45]

I trying to learn to DDC now

[Macintosh96]

Could you please do a video on the comp. Controled thermostats? Thanks!

[williami1821]

I like your videos, I am a service gay in flordia.I had a vav system installed and the installer kinked the lines going in to the vav, so they kelp breaking what a mess. great video thanks alot.

[DrZarkloff]

It sounds like you've had your hands full making repairs.

[V8Jagnut]

cool vid. dam there's a lot of inculcation on the pipes.lol. how cold dose it get there?

[DrZarkloff]

A typical cold day here is 30 degrees F. But it usually warms up to about 60 degrees F by Noon.

[V8Jagnut]

thats cold in my books.lol

[eggman9713]

@V8Jagnut For the most part the insulation is there to keep the heat in the pipes rather than keep the cold out.

[RockinGuy1994]

What is the valves job?

[DrZarkloff]

The hot water valve is a three way valve. There is one inlet port and two outlet ports. One of the outlet ports connect to the coil inside of the vav box and the other outlet port is connects to the bypass loop to insure that the incoming water is always hot.

[KDKid007]

nice video dr

[PutSome5tankOnIt]

Yikes!!! Asbestos insulation on the water pipes!!!

[DrZarkloff]

That's not actually asbestos. It's just in the same kind of wrap.

[IChoseTheRedPill]

it should be a mechanical (BOCA) rule that all hvac equipment be completely accessible for servicing.

[DrZarkloff]

Amen to that bro. That's my main gripe about VAVs.

[rlewis1946]

Absolutely agree! Also, notice (at 1:11) the wires exiting the armor cable, before they enter the box).

Poor workmanship and worse code inspection!

I just had to rank....

Thanks Dr Z for good work!

RL Atlanta, GA USA

[leshoffman1]

nice video show me more very educational

[DrZarkloff]

Thanks. There will be more forthcoming.

[mechanicwarrior20]

is that two wire control ( on off) or 3 wire control ( proportional) actuator head? I also notice that you have a N/C valve. Where I live up north a lot of the heating valves are N/O so that if a failure happens it will force the valve into full heat. But that also depends if you have a direct acting or reverse acting actuator.

[DrZarkloff]

This actuator is a three wire proportional. It's direct acting. The valve is a three way valve. It has two outlets. One is a bypass and the other goes to the coil.

[Kingratass]

how would you prevent the valve from sticking in the future? is there any fix for it or is it just a maintainance point every once in a while, or is it something that happens as it gets close to time to replace it?

[eggman9713]

Some of the fancier valves have a feedback control where it knows if it can't open or close the valve properly, and send an alarm to the control system. But this appears to be a typical older style valve that works just fine, but sometimes needs a little love to keep it working as it should.

[DrZarkloff]

This is most definitely an older style as there aren't many bells and whistles on this old guy.

[DrZarkloff]

It's just a maintenance point. Here in Florida, these valves don't get a lot of exercise.