Converted Furnace Harmonics - 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 04-02-2010, 05:04 PM   #1
Newbie
 
Join Date: Mar 2010
Posts: 16
Rewards Points: 10
Default

converted furnace harmonics


My Sears furnace, converted from NG to LPG, during warmup, produces harmonics similar to a trombone, and the noise subsides after ~30 seconds.
What causes this musical phenomenon?
Thanks.

Advertisement

leehinkleman is offline   Reply With Quote
Old 04-02-2010, 06:10 PM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,465
Rewards Points: 4,576
Default

converted furnace harmonics


Could be low gas pressure to the furnace.
Or the gas valve itself.

Advertisement

beenthere is offline   Reply With Quote
Old 04-02-2010, 06:22 PM   #3
Member
 
Join Date: May 2009
Location: Brooklyn, New York (NYC)
Posts: 1,124
Rewards Points: 500
Exclamation

converted furnace harmonics


Quote:
Originally Posted by beenthere View Post
Could be low gas pressure to the furnace.
Or the gas valve itself.
Interestingly. It's similar to a window a/c unit. If there's too much of a voltage drop (undervoltage) for any reason, it will rattle the frame until it reaches full operating capacity (in terms of running RPM.)!
spark plug is offline   Reply With Quote
Old 04-02-2010, 06:49 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,465
Rewards Points: 4,576
Default

converted furnace harmonics


Something like that.

Take a soda bottle. Blow across it. And it makes noise. If the pressure is too low going through the valve, it can sign a little.
beenthere is offline   Reply With Quote
Old 04-03-2010, 12:34 AM   #5
Newbie
 
Join Date: Mar 2010
Posts: 16
Rewards Points: 10
Default

converted furnace harmonics


Quote:
Originally Posted by beenthere View Post
Could be low gas pressure to the furnace.
Or the gas valve itself.
Thanks, and I think(and hope) that's exactly what's happening: low pressure from the supply to the valve, and even lower pressure from the valve to the furnace, which I think will become quieter when I get the correct supply, to the correct valve.
leehinkleman 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
Lennox Furnace G27M Series Unreliable operation: pressure switch or else? sheppard1977 HVAC 7 01-14-2013 06:42 PM
Water Inside/Around American Standard Furnace michrob HVAC 8 12-08-2011 04:51 PM
Furnace air filtration advice stephen_smith HVAC 7 12-24-2010 03:24 AM
Problems with new furnace..Overheating, having to reset. Furnace too big? Tommy2 HVAC 41 12-01-2008 02:55 PM
New Cased Coil - Install to Furnace - PICTURES!! hartkem HVAC 39 11-18-2008 02:45 AM




Top of Page | View New Posts