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curtis19 11-13-2011 10:49 AM

HVAC transformer
Hello. I have a Carrier package unit on the roof. Mdl # 48KL118300BE Ser. 2484C60423. The transformer is fried. primary side requires 230V . black and orange . I have no problem understanding this but,the transformers secondary side puzzles me somewhat. this one has 2 posts with 3 terminal connections, on the side of the transformer. The wires that add up to 6 wires.I'll explain: two terminal posts for 3 wires each. A set of 3 black. One goes to the Compressor contacter. Probably coils. One down to a large spark valve.The second post with 3 wire terminals are orange and white. they are clearly 24 v. one wire of this termiinal connects to Thermostat 24 v. wire comming into package unit. this is a 304960-702 Transformer. Sorry for being long winded. The sub for this Transformer is a TRA01BD208A. With a price tag of around 60.00. I have two questions. can i use a PF32440 Transformer ? And Use the Primary side option of 230V (Orange Blk.) And on the secondary side connect the 3 Black wires to the Secondary blue transformer wire; And the other set of wires, orange ect. to the yellow secondary transformer wire, and be done with it??? Any help would be appreciated. Thank YOu.

yuri 11-13-2011 11:30 AM

Post the model and serial # of the unit and wait awhile. There are a few Carrier techs here.

Master of Cold 11-13-2011 11:46 AM

Yes you can use the replacement xformer.
Some of the factory models have extra spade terminals for more wires. Others will piggyback on top of the other connectors.

biggles 11-13-2011 12:11 PM

power up the tr and read 24V right on the tr don't worry about where they go just get that true 24V onto the secondary

Yoyizit 11-13-2011 01:03 PM


Originally Posted by biggles (Post 770238)
just get that true 24V onto the secondary

And possibly up to 29 vac if there is no load on the secondary.

curtis19 11-13-2011 05:35 PM

HVAC Transformer.
Thank You for your comments. Cooool and helpful. To reiterate on the secondary side. As you stated , i can use this replacement tr. Now RE the secondary side . Can i tie all black wires to the Blue wire on the secondary side of TR. And all other wires- Orange White EXT. on the Yellow wire of the secondary side of the 24 volt ? thanks Again. regards, Curtis.

Master of Cold 11-13-2011 05:39 PM


Master of Cold 11-13-2011 05:41 PM

Make sure you put a fuse in the low voltage side. Why did the transformer burn up?

curtis19 11-13-2011 06:02 PM

Got it. A fuse comes with the TR on the blue wire of 24 v. And Yes, a great question. can you suggest some common culprits associated with the fried transformer. also 2 of the black wires on the 2ndary side comming out of tr r slightly melted. Thanks, curtis. PS: AWESOME FORUM. one of these wires goes down to an old heavy weight spark igniter plus valve. i think i have the term right. i call it a valve where the spark igniter wire plugs into.Its a rectangular steal box. About 9'' long with about 7 wires comming out.

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