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

    Nov 30, 2010, 08:51 PM
    24v Transformer Keeps Blowing
    I have a GE Smart Home low voltage switching system in my 1955 home. My transformer (120vac/24vac 40va) keeps blowing and I have since read that I should add an inline fuse to the 24v side to avoid blowing the transformer. My question is, how do I find the short? There are many low voltage wires coming to the secondary terminals and they are all wire tied together. When I place a meter to the ends I get zero. When I connect the transformer I get 9-10 v at the secondary terminals, it heats up quickly and blows after 2-3 minutes.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #2

    Dec 1, 2010, 06:44 AM

    Do you have pushbuttons for switching latching relays? If so, you need to measure the resistance of each of the relays coils, one may be shorted.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #3

    Dec 1, 2010, 06:45 AM

    Some have a separate wire to switch off, a dual coil relay, and it will have 3 wires for control instead of 2.
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!

24v Transformer [ 4 Answers ]

I am trying to find a good source for a 24v transformer. I am working on a project that will use a digital home thermostat to control a couple of 24v relays. I've found all of the parts but a suitable, cheap, 24v thransformer. I thought this would be the easiest part to find but it is turning...

24v transformer [ 4 Answers ]

How do I wire up a 24v transformer in a furnace for thermostat? What does 24v & 24vA connect to? I have a problem of fusses blowing when I turn on the furnace.:confused: How does heating transformer work?

24v transformer [ 2 Answers ]

Need wiring diagram to wire in 24v transformer I have gas furnace and a regular condensing unit not a heat pump. Fan relay side is 120 v . Had old style fan relay which is no longer available was sold new trans with plug in fan relay. Wall thermo cycles condensing unit but blower fan in furnace...

24v Transformer keeps failing [ 6 Answers ]

Hello, I have a 35 year old lennox furnace that seems to have an issue with the transformer. I had a repair person out and he wanted to charge me $7000 to replace the whole thing, but I won't be in this house much longer and I don't want to replace everything. Well I sent him on his way and...

24v transformer to dampers keeps blowing [ 1 Answers ]

I've quickly blown two 110 to 24v 40va transformers. This transformer powers the electronic dampers from my furnace. I have 2 zones, 2 thermostats. I've also had problems blowing the 3amp fuse in my furnace itself when activating my zone 2 thermostat. All three of my damper motors test out OK,...

View more questions Search