Comments on: HVAC VAV boxes 2

By: Kingratass

Kingratass — Thu, 25 Feb 2010 03:42:12 +0000

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?

By: mechanicwarrior20

mechanicwarrior20 — Thu, 25 Feb 2010 03:25:28 +0000

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.

By: eggman9713

eggman9713 — Thu, 25 Feb 2010 03:24:46 +0000

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.

By: leshoffman1

leshoffman1 — Thu, 25 Feb 2010 02:27:26 +0000

nice video show me more very educational

By: DrZarkloff

DrZarkloff — Thu, 25 Feb 2010 02:25:36 +0000

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.

By: DrZarkloff

DrZarkloff — Thu, 25 Feb 2010 02:19:47 +0000

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

By: IChoseTheRedPill

IChoseTheRedPill — Thu, 25 Feb 2010 01:38:40 +0000

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

By: PutSome5tankOnIt

PutSome5tankOnIt — Thu, 25 Feb 2010 00:47:33 +0000

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

By: DrZarkloff

DrZarkloff — Thu, 25 Feb 2010 00:42:18 +0000

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

By: DrZarkloff

DrZarkloff — Wed, 24 Feb 2010 23:55:58 +0000

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