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

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-08-2009, 02:42 PM   #1
Newbie
 
Join Date: Aug 2009
Posts: 2
Rewards Points: 10
Default

lennox 120-24v transformer


I accedentally hooked the 120v wire to the 24v pin on the blower motor relay,now everytime I put in a new transformer it burns up.any sugestions would be great..Shawn.

zammy is offline   Reply With Quote
Old 08-08-2009, 02:53 PM   #2
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

lennox 120-24v transformer


Quote:
Originally Posted by zammy View Post
I accedentally hooked the 120v wire to the 24v pin on the blower motor relay,now everytime I put in a new transformer it burns up.any sugestions would be great..Shawn.
Replace the blower motor relay which has a shorted coil (check the coil first with an ohmmeter) and protect your new 'former with a fuse unless the price of the 'former and the price of a fuse is close.
Finding the factory-specified dc coil resistance of this relay may be difficult. If there is a manuf. name on it you could call them.
Substantially less than 15 Ω sounds about right for a bad 24 vac coil. Also check for a short between the winding and the relay shell (ground).

If you know the 'former's Volt-Ampere rating you can get a new one and a fuse with holder way cheaper than what HVAC places charge, from Hosfelt, Digi-key, Mouser, Jameco or Allied Electronics.


Last edited by Yoyizit; 08-08-2009 at 03:00 PM.
Yoyizit is offline   Reply With Quote
Old 08-08-2009, 03:24 PM   #3
Newbie
 
Join Date: Aug 2009
Posts: 2
Rewards Points: 10
Default

lennox 120-24v transformer


thanks for the info, I thought it might be that relay coil, because of what I did to it, it ohmed out at infinity 1. I will change it..thanks again. shawn.
zammy is offline   Reply With Quote
Old 08-08-2009, 05:35 PM   #4
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Rewards Points: 2,000
Default

lennox 120-24v transformer


YOU GOTTA CHANGE THE BOARD.. the furnace will not be safe other wise. No way to know if other parts were compromised that could create unsafe conditions.
__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
Old 08-08-2009, 05:39 PM   #5
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

lennox 120-24v transformer


Quote:
Originally Posted by zammy View Post
it ohmed out at infinity
In that case something else is burning up the 'former and the Undead Gentleman is correct.

Last edited by Yoyizit; 08-08-2009 at 05:42 PM.
Yoyizit is offline   Reply With Quote
Old 08-08-2009, 07:01 PM   #6
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 9,787
Rewards Points: 2,712
Default

lennox 120-24v transformer


He may be dead in the future but what the heck. It is a DIY world. Can you say welded limit control. ( I won't even mention a few other critical parts or how to test them). Ignorance is bliss my old boss used to say.


Last edited by yuri; 08-08-2009 at 07:03 PM.
yuri is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
How to install Aprilaire transformer? Studly HVAC 9 09-18-2009 10:44 AM
Comfortmaker RPJ - Bad Transformer? olgranddad HVAC 2 12-26-2008 12:10 PM
Central Ac transformer question Rschrei518 HVAC 4 10-20-2008 09:21 PM
Different color wires on new doorbell transformer.... ConstantChange Electrical 31 11-22-2007 12:08 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.