Why is my Pneumatic Thermostat ; t stat making a constant hissing sound

[@JoseLopez-gi9sf]

Thank you for the video, for years I always wondered why the bookstore at the mall always had a hissing thermostat, now I know.

[@uclabh5530]

I always enjoy watching your videos . I have learned quite a bit from your training videos because I am also work in a building which has many pneumatic thermostats control. Thanks for keep doing what you are doing everyday.

[@kwacz]

I used to have pneumatics in a building I worked at. They can be finicky, but once you've worked on them for a while it gets easier to calibrate these systems. I kinda like them because their different. Tstats, valves, dampers, switches, low limits, etc... were all pneumatic. leaks in the system can cause them to not operate properly as well. The system has since been upgraded to digital controls which can now be controlled from a computer offsite.

[@whatevernamegoeshere3644]

This was a great tutorial. I saw this issue somewhere and checked because this was a mystery to me. I didn't even know these could be pneumatic

[@rgonz63ful]

Thank you for this video. It was really helpful to me.

[@robertarnold6672]

Also what can cause a hissing t-stat is that the O-rings ( S & R) are bad & need to be replaced. When the O rings are bad the T-stat cannot make a positive connection. Had to replace several of them today in my building. I just cut them off the clear tubing & install them on the original air lines if they are in good condition. Also a twisted or warped metal t-stat mounting plate can prevent a solid connection.

[@luisolivera9608]

Thank you, I went to an orientation for a job and they showed me this system for a water chiller. I got to calibrate one. It takes some time to get it right. It had some hissing so I hope I get to fix them if hired. Have 3/4 of refrigeration classes done but got out of school 4 years ago and need to get back ASAP.

[@marks9935]

Thanks man, the change out and the other possible reasons - leaking diaphragm, etc. Thanks!

[@kansasthunderman1]

Have you ever heard of a company called National Regulator Co. of Chicago? National was the original inventor (some time in the 1850s) of the pneumatic thermostat used for steam radiators.

[@CoryCDS]

Pneumatics are such a pain in the ass

[@robertarnold6672]

They were for me when I was inexperienced but now they are not too bad.

[@michaellong8379]

Excellent!

[@heartdragons]

Very helpful. lots of information and good explanation of 3 reasons as to why there would be a hissing sound. If only I was allowed to fix the issue, that would be great. lol (its at my school and we have to wait for a maintenance order to be accepted)

[@juanc10]

Awesome video. Thanks.

[@trezex8979]

Is anyone here from The Proper People exploring the Abandoned Mental Hospital with power with the hissing thermostats?

[@quadrplax]

I am, but I was also wondering this because I found one of these hissing myself.

[@trezex8979]

quadrplax oh right

[@michaelLeeMagnolia]

Yes here from the same thing

[@vatomicnxbula1993]

YESSSS

[@pekkatoikkanen3996]

YAsss

[@sidtrex1]

Thank you I'love your v d o. Good education sir

[@quadrplax]

Why are pnuematic thermostats even used? It seems like just using wires would be simpler.

[@djraepa]

lol

[@whiteguy4120]

That’s where the HVAC world is leaning towards. It’s DDC direct digital control. Don’t do HVAC, be a controls guy they make way more money and you don’t have to break your back. You need more brains than bronze!

[@juandominguez1634]

awesome video and well explained. Keep up the great work. Are there any other problems that could cause the T stat to leak like that?

[@ChrisRubeo]

I'm remodeling in an office and have to move the thermostat. There are tiny copper pipes in the ceiling above the thermostat with rubber tubes going down into the wall to the thermostat. Any ideas on the best rubber tubbing to use?

[@fathmasameer7523]

Sir can u explain some thing about elctronic expansion valve plz

[@sharonprystup1375]

thanks for all t he tips

[@spencerfenton]

Hey Ken where can I buy that gauge

[@KenTraining]

I got mine from Allied Refrigeration but you can get at any AC supply house/store

[@MrGabriel1973]

How about if it need adjust pressure How you do that?

[@KenTraining]

check out my channel, I think I have videos on this

[@MrGabriel1973]

Didn’t see any 😢😢