Blower Fan Delay - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 01-02-2012, 02:57 AM   #1
Newbie
 
Join Date: Dec 2011
Posts: 5
Rewards Points: 10
Default

blower fan delay


I have an old Janitrol furnace model GU075-3. Is it normal for there to be a 15 second delay before the fan turns on after the burners shut off?

Advertisement

mmm76 is offline   Reply With Quote
Old 01-02-2012, 03:07 AM   #2
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,414
Rewards Points: 2,490
Default

blower fan delay


15 seconds is kind of short, but yes for most furnaces it is normal. Mine runs the fan aprx 45 seconds to 1 min. after the heat stops, so that the fan will pull any residual heat off of the exchanger. Reason for the fan starting before, is with especially a/c, you want air flowing before the outside compressor starts up, so that the A-Coil does not freeze, let alone when heating, having the heat exchanger crack due to no air passing over it.

Advertisement

__________________
Ren: Now listen, Cadet. I've got a job for you. See this button? Ren: Don't touch it! It's the History Eraser button, you fool! Stimpy: So what'll happen? Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?
gregzoll is offline   Reply With Quote
Old 01-02-2012, 03:35 AM   #3
Newbie
 
Join Date: Dec 2011
Posts: 5
Rewards Points: 10
Default

blower fan delay


Quote:
Originally Posted by mmm76 View Post
I have an old Janitrol furnace model GU075-3. Is it normal for there to be a 15 second delay before the fan turns on after the burners shut off?

The fan doesn't run while the burners are on. The burners run for about 1 minute & the fan starts about 15 seconds after the burners shut off. The fan runs for about 1 minute. After several minutes the process repeats.
mmm76 is offline   Reply With Quote
Old 01-02-2012, 03:53 AM   #4
Limited Experience
 
Join Date: Oct 2011
Location: North Carolina
Posts: 123
Rewards Points: 75
Default

blower fan delay


Sounds like you have a problem in the thermal limit systems.

Maybe fans coming on too late so heat exchanger feels it is overheating.

Or heat exchanger over heat system tripping too soon and then the safety setting on the fans kicking on as the notice how hot the heat exchanger has gotten.
raleighthings is offline   Reply With Quote
Reply


Thread Tools
Display Modes

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
Bryant Plus 90 - No Blower Ducaticorse HVAC 11 10-16-2012 09:39 PM
Odd Fireplace Outlet Behavior permagrin Electrical 2 12-17-2011 09:06 AM
Delay Indoor Blower UncaYimmy HVAC 14 01-13-2011 04:53 AM
Carrier 58MXA Wiring Blower Switch 63012753 HVAC 0 10-06-2009 10:09 PM




Top of Page | View New Posts