Luxaire furnace wiring diagram

______________________________________________________________________ Greetings, all. This certainly seems like the right place to ask my question. It should be brief. Luxaire ’60s/’70s Vintage Forced Air furnace I had blower motor problems earlier in the year, and removed the old blower so I could replace it. Unfortunately, my friend disconnected all the wires before I got a chance to snapshot it. So now I have the following: red, white, black wires coming from my transformer (switched), white and black wires from the fan limit, and blue and purple coming from the blower motor. The blower is wired for single-speed (1/8hp), and I was told by the dealer to connect the purple wire to the white wire. Wired directly, the blower does work fine. Now, following Xeno’s advice on another thread, I left the black disconnected, connected the white to the “line” side of the limit, and the red to the blue wire of the blower. The “load” side of the limit is connected to the purple wire of the blower. The limit is behaving properly and the burners ignite with no problem. After it rolls past the first stop, the blower does not turn on. So, the question is, where does the black wire from the transformer connect? I appreciate any help. Thanks in advance! btw: there is a rough diagram at: http://www.doubleklix.com/images/furnace_diag.jpg [this message was edited by Raistlin on Sat 16 Oct 23:15] Replies: xenos Webmaster “Re(1):Luxaire furnace wiring diagram” , posted Sun 17 Oct 11:37 ______________________________________________________________________ I wouldnt be using my information from another thread as it may be out of context. According to what I see, the limit only has 2 wires, therefore it will power the transformers black wire ( so if the furnace overheats control power is killed). Now this motor why did you chose blue and purple that doesnt sound right. First you need to power its common with common or L2. and witch ever speed you need, it may be blue , black or red. Now you mention the first stop that would mean the furnace actually have a fan limit control and it should have 3 wires. This third wire will power what ever wire is the fan motors heating speed. Xenos. The best way to escape a problem is to solve it. Raistlin “Re(2):Luxaire furnace wiring diagram” , posted Tue 19 Oct 06:07: ______________________________________________________________________ *sic* [this message was edited by Raistlin on Tue 19 Oct 06:08] Raistlin “Re(2):Luxaire furnace wiring diagram” , posted Mon 18 Oct 15:02 ______________________________________________________________________ I wouldnt be using my information from another thread as it may be out of context. ***** Fair enough. ;)***** According to what I see, the limit only has 2 wires, therefore it will power the transformers black wire ( so if the furnace overheats control power is killed). ***** So the black wire from the transformer connects to the “LINE” side of the limit, correct? ***** Now this motor why did you chose blue and purple that doesnt sound right. ***** Manufacturers’ directions for the proper speed setting. :) ***** First you need to power its common with common or L2. and witch ever speed you need, it may be blue , black or red. ***** Purple is now connected to L2 from the transformer (White) ***** Now you mention the first stop that would mean the furnace actually have a fan limit control and it should have 3 wires. This third wire will power what ever wire is the fan motors heating speed. ***** Picture link below so you can see what the limit looks like. ***** Ok, this said and done, I currently have a red wire hanging freely. Is this correct? Links to limit switches: http://www.doubleklix.com/images/limit_001.jpg http://www.doubleklix.com/images/limit_002.jpg I hope this helps you. And thank you for your quick reply! :) xenos Webmaster “Re(3):Luxaire furnace wiring diagram” , posted Mon 18 Oct 19:17 ______________________________________________________________________ Thank you for those pics , Ok you power the black line Wire from both the fan swich and transformer with 120 and the white wire powers from the fan switch power motor. Are you sure purple on the motor is common? Xenos. The best way to escape a problem is to solve it. Raistlin “Re(4):Luxaire furnace wiring diagram” , posted Tue 19 Oct 06:09 ______________________________________________________________________ Thank you again for the fast response. I’m sorry to keep bothering you. First: yes, I’m sure the purple wire is the common for the motor. The link below is what how I understand your instructions. Of course, I believe this is assuming the red wire carries 120v continuous? http://www.doubleklix.com/mta/iB_html/uploads/post-42-79972-furnace_di ag.jpg I believe I had it configured in this manner, and the blower stays on continuously. I am at work now, so I can’t verify. But I will check when I get home to be sure. Thanks again! xenos Webmaster “Re(5):Luxaire furnace wiring diagram” , posted Tue 19 Oct 07:44 ______________________________________________________________________ I think the red wire will go on the other wire to power the fan. what is the model number of tht transformer because I think it’s more than just a transformer but a fan relay pack. Xenos. The best way to escape a problem is to solve it. Raistlin “Re(6):Luxaire furnace wiring diagram” , posted Tue 19 Oct 13:55 ______________________________________________________________________ You may be right. It is a Honeywell R8102A. The image link below is the label from the inside of the transformer housing which may help you out greatly (I hope!). http://www.doubleklix.com/images/label_01.jpg Thank you again! xenos Webmaster “Re(7):Luxaire furnace wiring diagram” , posted Tue 19 Oct 18:35 ______________________________________________________________________ There is you answer. According to that diagram terminals 3 and 4 of what you refer to as the transformer are in parallel with the furnace fan switch. Xenos. The best way to escape a problem is to solve it. Raistlin “Re(8):Luxaire furnace wiring diagram” , posted Thu 21 Oct 07:19: ______________________________________________________________________ Any chance of posting a drawing? I have it connected in parallel now, and the blower still won’t turn off. I’m starting to fear the limit might be broken. :( email is r4stl1n@gmail.com if you don’t have a way to post a picture. [this message was edited by Raistlin on Thu 21 Oct 07:20] xenos Webmaster “Re(9):Luxaire furnace wiring diagram” , posted Thu 21 Oct 08:15 ______________________________________________________________________ P.S. Turn the dial on the fan limit all the way and see if the burners turn off. and btw is the fan on button on it pushed in? Xenos. The best way to escape a problem is to solve it. xenos Webmaster “Re(9):Luxaire furnace wiring diagram” , posted Thu 21 Oct 08:13 ______________________________________________________________________ You have the drawing, you just posted it a photo of it. Xenos. The best way to escape a problem is to solve it.

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