Pneumatic Session #2 -- Thermostats and Controllers: Clip 2 of 6

Pneumatic Session #2 -- Thermostats and Controllers: Clip 2 of 6. Recorded webinar from Industrial Controls with speakers Wes Fagan and Robert Franecki. April 21, 2010.

Topics Covered:
*Understanding terminology -- establishing a common vocabulary to communicate operations and problems
*Practical aspects of pneumatic thermostats -- how to keep them working and how to specify a replacement
*Reviewing controllers and transmitters -- a quick overview into the often misunderstood parts of a pneumatic system

What You Will Learn:
This session picks up where session I ended. This series continues as a practical guide to understanding the fundamentals of a pneumatic control system, what is critical to their successful operation and understanding various elements in the system.

We will review general terms used in describing the characteristics of thermostats, transmitters, controllers and relays. Our focus will continue to be practical application and use information, including calibration and adjustments to these devices.

Who Should Attend: Maintenance people at the user level and service technicians

Speaker(s):
Wes Fagan is a salesman at Industrial Controls' New York City office. He has worked with Honeywell commercial controls for 17 years, Industrial Controls for 11 years and is an instructor for NY Pipefitters Local 638 .

Robert Franecki is Product Manager for Pneumatic products and Valves at Johnson Controls and has been with Johnson Controls for 40 years. Bob has worked in the areas of metrology, design of production test equipment for the pneumatic and valve product lines, and has done quality and sustaining engineering for the pneumatic and valve product lines. Bob has a BS degree in electrical engineering from the University of Wisconsin-Milwaukee.

Category:

Science & Technology

Tags:

• Pneumatic
• Thermostats
• and
• Controllers
• Part

[ictraining]

Sometimes buildings need to bring back the night setting to all of the stats that have been overridden (on Friday night or Saturday). One strategy that is used to return all of the stats is to switch to the day pressure for a few minutes then back to the night pressure . This way all of the stats will go to the energy saving setpoint for the remainder of the weekend.

[ictraining]

in a day night tstat, pressing the button in the day will have no effect. the button will return to the day position.

at the night inlet pressure it uses the internal pressure present in the stat to keep the over ride button in place for the higher daytime setting when the button is pressed. At day pressures, that pressure (typically the higher pressure) is not present so the button snaps back to the non-over ride position.

[odess4sd4d]

Thanks for the response. At first I didn't understand it because on my system the indexing switches didn't pop back up during day mode. I finally realized that the thermostats had been damaged by bad air at some point. As I have replaced them I see that in day mode they do pop right back up. This channel is a fantastic resource. Thanks again.

[odess4sd4d]

On the dual thermostat, if the manual override push button is depressed during the day (15 psi supply), does it have any effect? Is the push button supposed to automatically return to the up position, if so, what triggers that?