Ask Experts Questions for FREE Help !
Ask
    drehou's Avatar
    drehou Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Jun 8, 2012, 05:43 AM
    Why do my transformer burn out on my air handler
    I replaced three transformer on my air handler on yesterday, the last one ran for about thirty min. then it burned out, I looked at the wiring to see if I had frailed wire anywere but I did not, can anyone help with this problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 8, 2012, 05:50 AM
    Quote Originally Posted by drehou View Post
    I replaced three transformer on my air handler on yesterday, the last one ran for about thirty min. then it burned out, I looked at the wiring to see if I had frailed wire anywere but I did not, can anyone help with this problem?
    It could be the transformer you are using as a replacement is not capable of producing the required VA for the system. I would check this first. Next you will need to check the components powered by the transformer for short circuits etc

    Note: Adding a small low voltage designed circuit breaker or a fuse holder and fuse will prevent you from burning out the transformer while you are servicing the system. The fuse is cheaper than the transformer.
    drehou's Avatar
    drehou Posts: 4, Reputation: 1
    New Member
    		  
    #3

    Jun 8, 2012, 05:56 AM
    Quote Originally Posted by hvac1000 View Post
    It could be the transformer you are using as a replacement is not capable of producing the required VA for the system. I would check this first. Next you will need to check the components powered by the transformer for short circuits etc

    Note: Adding a small low voltage designed circuit breaker or a fuse holder and fuse will prevent you from burning out the transformer while you are servicing the system. The fuse is cheaper than the transformer.
    What type of fuse would you recommend?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #4

    Jun 8, 2012, 06:51 AM
    The problem could be a short in the low voltage wiring to the compressor or to thermostat.
    Could also be shorted windings on one of the relays/contactors coil.
    I take it does it on cooling will exclude the heating relay.
    Leaving Blower or Compressor Contactor/relays.
    What is the VA of the transformer.
    May just need more VA's
    drehou's Avatar
    drehou Posts: 4, Reputation: 1
    New Member
    		  
    #5

    Jun 8, 2012, 07:34 AM
    My transfomer I have is - JARD CLASS 2 50/60Hz
    TF402424-B51C84 K
    PRI WH BK RD OR
    B-10 COM 120 208 240V
    SEC BL-COM YW-24V 40VA
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Air Handler blower won't start - hum from transformer? [ 18 Answers ]

Air Handler: Armstrong 40528C093 Transformer: Basler Electric BE321640GEK (photo attached) - a quick web search found it here: Amana, Goodman Transformer 208/230 Volts 24 Volt Secondary: Best Buy Heating and Air Conditioning (note: although that webpage shows the primary voltage as 208/230, the...

Wiring 24volt transformer in ac air handler [ 2 Answers ]

I need instructions how to install 24 volt transformer in air handler

Carrier air handler 24 volt transformer. [ 15 Answers ]

Last week my air handler quit working, I found that the 5AMP fuse for the secondary 24volt pwr supply was blown, replace and all worked fine for a week. Now I find it blown again, but each time I relace it it blows, The voltage reading I get at the fuse is 29.5 V is that to high? The transformer...

View more questions Search