wiring furnace transformer

jasonbaur · 10-26-2012, 03:50 PM

Hi all, I am trying to install a new transformer on my furnace and well the new transformer does not have the labels my old one did, COM , COM , 120v, 24v. Here is a picture of the transformer it only shows LOAD, LINE but doesn't specify which lead is exactly what.

Also I have attached a second picture of my old transformer.

Thanks for any help.

Doc Holliday · 10-26-2012, 03:55 PM

Do you have an electrical meter? Line is where the high voltage goes in. Once that's there I'd test the other terminals to make sure 24 volts is coming out, the load side.

Line is the feed, load is the work being performed from the said feed. In this instance it's a step down 120 volt to 24 volt tranny, 24 volts being the load.

jasonbaur · 10-26-2012, 04:09 PM

Ya the line is ok not sure why the old transformer finally gave out. Anyhow ya my best guess is the top 2 ports are the 24v and com, the bottom is the 120v and com, no idea if it matters left or right or right to left I hate how they aren't labeled specifically.

thanks.

Quote:

Originally Posted by Doc Holliday

Do you have an electrical meter? Line is where the high voltage goes in. Once that's there I'd test the other terminals to make sure 24 volts is coming out, the load side.

Line is the feed, load is the work being performed from the said feed. In this instance it's a step down 120 volt to 24 volt tranny, 24 volts being the load.

JJboy · 10-26-2012, 04:21 PM

black/white wires use to 120v

Sent from my iPhone using DIY Forum

**beenthere** · 10-26-2012, 04:44 PM

As long as you connect the 120 volt to the 120 volt terminals, it doesn't matter which wire goes where. Its just a coil of copper wire wound around an core.

10-26-2012, 03:50 PM	#1
jasonbaur Newbie Join Date: Oct 2012 Posts: 2	wiring furnace transformer Hi all, I am trying to install a new transformer on my furnace and well the new transformer does not have the labels my old one did, COM , COM , 120v, 24v. Here is a picture of the transformer it only shows LOAD, LINE but doesn't specify which lead is exactly what. Also I have attached a second picture of my old transformer. Thanks for any help.

10-26-2012, 03:55 PM	#2
Doc Holliday I'm Your Huckleberry Join Date: Mar 2011 Posts: 5,219	wiring furnace transformer Do you have an electrical meter? Line is where the high voltage goes in. Once that's there I'd test the other terminals to make sure 24 volts is coming out, the load side. Line is the feed, load is the work being performed from the said feed. In this instance it's a step down 120 volt to 24 volt tranny, 24 volts being the load. __________________ Thanks.

10-26-2012, 04:21 PM	#4
JJboy Member Join Date: Oct 2010 Location: Austin - Texas Posts: 1,402	wiring furnace transformer black/white wires use to 120v Sent from my iPhone using DIY Forum __________________ Always kill the power Hot air rises, but heat will always move from higher to lower temperatures. Real man shoot in manual. If it ain't grounded, it ain't dead.

10-26-2012, 04:44 PM	#5
beenthere An old Tradesmen Join Date: Oct 2008 Location: PA Posts: 19,069	wiring furnace transformer As long as you connect the 120 volt to the 120 volt terminals, it doesn't matter which wire goes where. Its just a coil of copper wire wound around an core.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

wiring furnace transformer