Air Pressure Switch - HVAC - Contractor Talk

Air Pressure Switch

Thread Tools Search this Thread Display Modes
Old 07-25-2010, 10:18 PM   #1
Registered User
mistermcfrug's Avatar
Trade: handyman--34 years
Join Date: Jul 2010
Posts: 10
Rewards Points: 10

Air Pressure Switch

I'm a professional handyman who needs a little help with a Teledyne Mini-Therm boiler JVi.

The boiler's problem is that I'm noticing excessive fan blower operation, long after the burner is out. I note that the igniter will turn on at times and then go out without the burner firing. I'm not surprised because no thermostat is calling for heat. My customer is complaining because she hears the blower running a lot of the time.

I suspicious of the air pressure switch because it appears to control operation of the blower but have to admit that I'm unsure of how it operates.

So the questions are:

How does the air pressure switch work?

Could the air pressure switch be playing a role in excessive blower operation long after the burner goes out?

Also, could just the fact that the blower is running play some role in my observation that the igniter will start up, then go out without the burner firing (again, in a situation when thermostats are not calling for heat)?

Thanks much for any useful comments!!
mistermcfrug is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!




Old 07-28-2010, 04:40 PM   #2
beenthere's Avatar
Trade: HVAC
Join Date: Mar 2009
Posts: 2,446
Rewards Points: 1,202

Re: Air Pressure Switch

The air pressure switch is a safety. It doesn't run the blower. It detects if the blower is running.

there is probably a short in the wiring somewhere.


beenthere is offline  
Old 07-28-2010, 06:40 PM   #3
Registered User
mistermcfrug's Avatar
Trade: handyman--34 years
Join Date: Jul 2010
Posts: 10
Rewards Points: 10

Re: Air Pressure Switch

thank you for the comment
mistermcfrug is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lennox Pressure Switch Trouble? Glock23 HVAC 3 11-18-2012 11:11 AM
How to Safely Pressure Wash Your Home. PressureWashE Pressure Washing 1 07-02-2010 05:50 AM
pressure switch on a coleman pathfinder2112 HVAC 2 04-07-2008 11:11 PM
Multiple fixtures on switch loop KenHaynes Electrical 2 12-05-2007 03:15 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for

At we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?