Category Archives: Pneumatic Controls

Information about pneumatic controls.

Control System Fundamentals

This post evolved to support a string of posts I will start next to support an exercise in one of the classes I am involved with at the Pacific Energy Center.  In those posts, we will look at how you … Continue reading

Posted in Controls, HVAC Fundamentals, Operations and Maintenance, Pneumatic Controls | 2 Comments

Economizers–The Physics of Linkage Systems

In the post before the previous, I was discussing an economizer performance problem in a facility we worked with as a class in Monterey California.  One of the problems was related to the mechanics of motion in the linkage system … Continue reading

Posted in Air Handling Systems, Controls, Economizers, Pneumatic Controls | Leave a comment

Pneumatic Controls Resources

Since the post I recently put up on pneumatic controls (actually even before I did that), people occasionally ask me if there are resources out there that would help them better understand pneumatic controls.  Even though the industry is moving … Continue reading

Posted in Controls, Pneumatic Controls, Resource List and other Resources, Retrocommissioning Findings | 2 Comments

Pneumatic Controls, First Cost Advantages, and Retrocommissioning Opportunities

Recently, a reader posted a question in response to my post titled Retrocommissioning Findings: Make Up Air Handling System Simultaneous Heating and Cooling – The Clues – #2 – The Controls May be Pneumatic.  Specifically, the question was: What are … Continue reading

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Retrocommissioning Findings: Make Up Air Handling System Simultaneous Heating and Cooling – The Clues – #2 – The Controls May be Pneumatic

This post looks at why pneumatic controls can be a clue regarding a retrocommissioning opportunity.   But before I go into that, I wanted to clarify the difference between pneumatic control and pneumatic actuation as the two are sometimes confused. Pneumatic … Continue reading

Posted in Air Handling Systems, Pneumatic Controls, Retrocommissioning Findings | 3 Comments

Resources for the Resourceful: The Honeywell "Gray Manual’

Today, I was pleased to discover that a classic control system reference was available on line. Specifically, the Honeywell “Gray Manual” is now available in an interactive HTML format (pictured below) as well as a down-loadable .pdf file. I lost … Continue reading

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Control Technology; A Glimpse Backward and Some Thoughts on the Future

Earlier this week, while deploying loggers to monitor filter performance in the Kaiser Building in downtown Portland, Oregon, I noticed that the original building control panel was still in place in the current engineering office/control room as illustrated below. This … Continue reading

Posted in Controls, Pneumatic Controls | Leave a comment