How to calibrate a pneumatic thermostat
If you are in the HVAC business and work on controls you either have or will have the experience of calibrating a pneumatic thermostat. Jerry Condiff is the instructor that teaches both the basic and advanced pneumatic and VAV hands on training courses at Stromquist & Company.
If you have never calibrated a pneumatic thermostat in can be a bit daunting if you read the instruction sheets but here is a secret……….
It does not matter if you are calibrating a Honeywell pneumatic thermostat, a Johnson pneumatic thermostat, a Robertshaw, Barber Colman, a Siemens ( Powers) pneumatic thermostat ,or even a wireless pneumatic thermostat if you know how to calibrate one brand of pneumatic thermostat you know how to calibrate every brand of pneumatic thermostat. Each manufacturer of pneumatics uses different terminology to describe how to calibrate their pneumatic devices, which can be confusing if you work on different brands of pneumatic thermostats, but the bottom line is the calibration is always the same process. So watch this video and let Jerry Condiff, show you how easy it is to calibrate a pneumatic thermostat. To get information on Jerry’s next pneumatics or VAV class at Stromquist & Company please contact Edna at either 404.794.3440 or 800.241.9471
About the author
Eric has been in the controls industry since 1979. His passion for controls and the desire to provide an easy way for HVAC professionals to keep up with the rapid changes in controls technology inspired him to create Controltrends.
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question?how do you calibrate a johnson controls t-3300 dual temperature dual dual pressure t-stat/
Hi Robert, the principals are the same as in the video but because you are dealing with two temperatures it is a bit more complicated. Come to pneumatics class this fall in either Atlanta or Tampa and you can do it “hands on” if you can’t make the class here is a link that will tell you how to do it: http://www.controltrends.org/wp-content/uploads/2011/08/T3300-Calibration.pdf
Thanks,
Eric
does this apply to reverse acting and direct acting,
Hi Cameron,
Thanks for your question. You are correct, the process applies to both direct and reverse acting thermostats
Hi Eric ,
I work in a chuch and we have pneumatic thermostate and i would like to buy a video on how to calibrate the thermostate. I had wach a video on line but I still do not undestands. thak you if you know where i can buy it . thank you Eric
Question? The calibration he does resuts in the actuator stroking some. Settint the stat at ambient sets the is to satisfied which should mean no heat no cool satisfied no action needed. Meaning this calibration technique seems to be wrong can you expalain to me why the actuator is stroking to allow cooling when no action should be taken. Thanks Andy
you show great presentation
is this reverse acting or direct acting tstat
thx
Pedro
You would need a pneumatic calibration kit. In the kit will have the gauge like he is using in the video. Please note he is showing where to install the gauge and about needing info about Spring range. Need to keep the pneumatic system free from dirt and moisture. The Video is a YouTube and there is an add on for Firefox called ANT that will download the YouTube video so you have watch it offline.. Good luck
andy
He shows you the proper way to calibrate a T-stat. You want to actuator to just start to open at room set point. There will be no lag in time for the actuator and will be more accurate.. take care
syed
You can get DA or RA Stats. They have DA/RA combo stats that will do both. Depends on what PSI of your pneumatic system.
Example
25psig Main – RA, Summer
16psig Main – DA, Winter
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