Pneumatic Controls

Gordo

Does anybody have information on a replacement part for this Powers pneumatic thermostat?  There was no number on it that I could see.

furnacefigher15

Application

Not off hand do I have #'s.



What is it being used for? To control what?

meplumber

Good Luck Gordo

I have pulled a crap load of those old Landis & Gyr and Powers systems out of schools and hospitals. Sorry, but the few parts that we scavenged have been used up long ago.



Johnstone Supply used to have some aftermarket pneumatic parts. Nothing OEM, but they were all pretty much the same. If you can match the opening and closing force pressures, you should be ok.



Good Luck to you.

tim smith

Re Pneumatics

Get as much data and pics and get in touch with local commercial honeywell or Johnson rep. They will help you find functional replacement.

sasman

t-stat

www.customer.honeywell.com/Pneumatics





22mb, wasn't going to try and attach

Gordo

Pneumatics

My knowledge and experience with pneumatics is not what it should be.



This is a 1/2" D.A.(?) valve to an old Carrier convector unit with fan motor.



During the winter, it gets hot water and then summer time, chilled water (?).



It looks like the overall pneumatic system is two pressure, either summer/winter or daytime/nighttime (?).



The thermostat has two 1/4" copper pipes to it, one is supply and one to the actuator and it has a remote sensing bulb in the inlet air steam of the unit.

Gordo

Thanks for the Reply

Yep, I starting from way down the learning curve on this one.

Gordo

That's a Good Suggestion

I hope they might meet me on-site. 

Wesman

Pneumatic help

Take a look at the following from Siemens.  The valve can be replaced with part #268-03165.  This should be a 1/2 in female x female NPT normally open valve.  The spring range will be 3-8 psi.  3 will be open, 8 will be closed. 

The thermostat is more challenging.  Take a look at 188-0030.  This will be a summer winter stat with a 4 foot capillary.  It will control between 60 and 85 degrees F.  Ask the building engineer what main line pressure they use in the summer and winter.  If its 18 and 25 you should be on the right track. 



Each manufacturer uses a different changeover pressure.  Honeywell is 13 and 18.  Johnson is 15 and 20.  Intermixing manufacturers in summer winter or day night applications is possible but tricky.