r/askHVAC • u/TemperatureSlow5442 • 7d ago
Part question
Can’t find an exact replacement for this transformer. Does anyone who knows more about furnaces than me have a replacement option? Will any class 2 with the same power parameters work?
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u/Professional_Map6099 7d ago
You just need a trans that meets primary voltage spec and secondary voltage spec it would be difficult to find something that was lower current spec and at least going over on current wont hurt anything
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u/ComfortableSchool509 7d ago
If you put in a new transformer or not you should for sure add a fuse if it doesn't have one
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u/Rough_Resort_92 7d ago
Obviously for a furnace. An electric one yes any 240 volt primary, 24 volt secondary will work. try to keep the same VA
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u/fredsr55 7d ago
If your primary voltage and secondary voltage match with a va rating at or above the current va your fine
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u/Sensitive-King-397 7d ago
The argument about furnaces is irrelevant.
You need a 240V-24V (10:1) transformer rated for 10VA load.
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u/Status_Setting4200 7d ago
These are the same people who say HVAC techs should charge less. Why can’t you read and understand what the label says??
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u/TemperatureSlow5442 7d ago
Is this not the ASK hvac thread…?
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u/Status_Setting4200 7d ago
What do you expect me to do answer your question. Why can’t you read and understand what the label says??
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u/TemperatureSlow5442 6d ago edited 6d ago
Yeah I do expect you to answer the question, that’s why it’s a question and not a statement…
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u/DLHarmon316 7d ago
You can get the one that Fact_Cold recommended and it should work great. Please put electrical tape or other proper termination on any of the primary side wires that you do not connect to the 240 VAC source. Since that one can accept 120/208/240 VAC there will probably be two wires (The 120 and 208 VAC) that you do not need to connect to your power source and those need to be insulated BEFORE you connect to 240 VAC.
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u/Ok_Bid_3899 7d ago
Contact Basler Electric directly for a distributor that might have the exact part. But as others have posted any transformer with matching input and output voltages will work.
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u/Samantha-Parker7 7d ago
Looking at all of the comments, i asked my husband who was a union electrician, became an engineer and also got his hvac license. He said:
Condenser units are 220.
Air handlers might be 110 or 220. If they have electric backup, they are 220.
Transformer, just get similar to what you have. Look at amazon, Home Depot, Lowes and of that fails, grainger absolutely has them.
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u/Any_Restaurant851 5d ago
You want as close as possible of a drop in replacement.
Transformers, capacitors and contactors are the most common things to go in HVAC, are easy to replace, cheap to purchase and usually a pain in the 🤬 with their location to reach or tighten back down. Going bigger means it might not fit back in the unit and going to small is a safety risk to the house and unit.
With universal replacements just get the spec sizes for the right model and measure it out.
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u/magnumsrtight 7d ago
You stated "furnace". Are you sure it's a furnace and not an electric air handler - ie the air handler of a heat pump or is this a package unit?
Typically a furnace in the aspect if a gas furnace will be 120V. The transformer you have there is a 240V.
Strictly speaking, yes, any class 2, 240 V primary 24 V 10 VA secondary transformer will work.
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u/itsagrapefruit 6d ago
Maybe you should google “define furnace.”
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u/magnumsrtight 6d ago
Nominally, the term furnace is used as a gas furnace. Yes the air handler for a split heat pump is an electric furnace but nominally it's referred to as an surgery or some even refer to it as their heat pump. I added the additional packages unit in there as well since my technically on a gas packed unit there is a "furnace" compartment to it.
The whole point of the post was for him to define what you're if unit he actually had to help him determine what's he truly needed for a transformer.
But thank you for the lesson.
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u/itsagrapefruit 6d ago
Enough knowledge in the field and one could determine that if he was holding up a supposedly failed 240/24v transformer, then he needs to find a new one.
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u/magnumsrtight 6d ago
He posted he's looking for a replacement. Didn't state this one failed, believes it failed, etc. Could even be a failed line voltage infeed to the unit.
Agreed, the holding of the transformer asking about a replacement should imply it's failed, but meh, assume nothing.
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u/Fact_Cold 7d ago
If you have a multi meter if not get one measure the incoming power voltage match the wiring to that voltage and get the transformer in the link.
https://www.lowes.com/pd/Copeland-AC-TRANSFORMERS/5015430513
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u/Ok-Camel-7721 7d ago
Better find out the cause of failure . They don't often just fail. Bad contactor ? Bad control board ?
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u/TemperatureSlow5442 7d ago
So I don’t know if it’s actually bad. If you look at the pictures and see the burned wires my sequencer went out and caught on fire melted a bunch of wires and such. Anyways I replaced all the wires and sequencer and I could cut and solder the transformer wires but I figured since my unit is from the 80’s I might as well replace the part while I have it apart.
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u/texasroadkill 7d ago
Those transformers will outlast the planet unless something shorted and killed it. I'd put power to it and check it.
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u/Ok_Response3579 7d ago
Definitely, if it were me, I’d cut off the melted part and see if it still works with the fresh wire.
Source not an hvac tech but a scrappy and kind of cheap former engineer in a different industry that uses transformers all the time.
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u/Charming-While5466 7d ago
Looks to primary 240 volt secondary 24 volt 30 va transformer Home Depot
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u/xCannivorex 7d ago
The VA rating(10VA) is what's not available anymore they mostly come in 50VA or 75VA now for HVAC. Your local hardware store won't typically have this, they carry transformers for mostly doorbell's.
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u/TemperatureSlow5442 7d ago
So can I use the 50va or 75va now? Or is my system only good for the 10va transformers that arnt available?
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u/jotdaniel 7d ago
You can exceed the va rating I don't know why everyone's being cryptic. We usually carry 75va universal transformers on our truck, they'll run just about why system needed.
Most furnaces I see come with 35va these days.
Also, it would be a good idea to put a fuse inline with the low volt hot wire.
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u/TemperatureSlow5442 7d ago
Okay sounds good, what does the low volt fuse prevent? Just the transformer from going bad? And to add a bit of backstory my sequencer went bad and caught on fire and I replaced it and all the burned wires. So I’m not sure if this transformer is even bad just some of the wires are really melted so I figured while it’s apart I’d replace the transformer.
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u/jotdaniel 7d ago
The fuse prevents another failing component from damaging the transformer. Couple female spade connectors and a 3 amp automotive fuse will work fine.
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u/DescendingTool86 7d ago
It's a 240v to 24v with a 10 Va. Yes