Testing found transformer


  #1  
Old 12-12-22, 07:36 PM
T
Member
Thread Starter
Join Date: Apr 2015
Location: USA
Posts: 771
Received 76 Upvotes on 69 Posts
Testing found transformer

Cleaning out some storage and came upon this transformer, not sure why I saved it. Its to a Trane HVAC system. To test if it is working (and thus I would continue to keep as I'm sure it's related to my Trane HVAC) would I just connect line voltage hot to the 115v tab and the neutral to the upper "C" tab then measure for 24vac on the bottom two?

If so, can these show 24v yet still fail under a load? Again, not sure why I'd kept this if I replaced it. (Memory fading....)

 
  #2  
Old 12-12-22, 07:40 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,730
Received 4,114 Upvotes on 3,695 Posts
That's a Trane BE25214011 transformer.
In the picture the top two terminals are 120v in and the bottom two are 24vac out.
 
  #3  
Old 12-13-22, 12:01 PM
T
Member
Thread Starter
Join Date: Apr 2015
Location: USA
Posts: 771
Received 76 Upvotes on 69 Posts
So can transformers fail under load yet test okay via voltage? Trying to decide whether to keep or junk it.
 
  #4  
Old 12-13-22, 01:14 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,730
Received 4,114 Upvotes on 3,695 Posts
If you apply 120v to the primary and get 24-28vac on the secondary.... it's good.
 
CircuitBreaker voted this post useful.
  #5  
Old 12-13-22, 03:20 PM
B
Member
Join Date: Oct 2015
Location: Ct.,USA
Posts: 3,339
Received 314 Upvotes on 277 Posts
Transformers don't degrade when powering a load up to that speced on the transformer. They operate or fail.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: