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Old 07-07-2013, 03:57 AM   #1
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please check out this wiring diagram


So I bought a new broan bathroom fan/lamp. Its replacing the same style unit, but this ones about 20 years newer and the wiring has changed. The original had 3 switches controlling the fan, and each lamp separately. I want to keep it this way, but the wiring running up in the ceiling to the fan doesn't have enough wires for the new units diagram. The old unit had two cables running to it. One 12/2 and one 12/3. From the new wiring diagram it looks like it now calls for two 12/3 cables. Not sure what changed? The new fan does the same as the old and looks exactly the same. Can someone check out this diagram and see if I can run all three functions separately with my old 12/2 and 12/3 cables. Also, can someone tell me what this yellow wire does, since it wasn't in the old fan. What's that symbol on the end of the yellow wire?
Thanks!
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please check out this wiring diagram-164speclabel_large.jpg  
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Old 07-07-2013, 06:51 AM   #2
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please check out this wiring diagram


The symbol on the end of the yellow wire is a thermal switch.

That's why it says that the fan may cycle when the light is on.

It needs to be fed a constant hot. This way the switch can operate it or if it gets to temperature the fan will automatically cut on.
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Old 07-07-2013, 12:57 PM   #3
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Use only 1 of the whites to supply the neutral to the unit. Remark the other as hot and use it to supply power to the fan yellow lead. This is a minor code violation.

Or use 1 switch for both the fan and light. Use another for the heat lamp. Third switch not used. This is code compliant.

Or replace the 2 wire cable.
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Old 07-07-2013, 03:24 PM   #4
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Thanks! I think I've got this figured out now. I want to replace the 12/2 cable with another 12/3, so there will be two 12/3 cables running to the exhaust fan/light. Right now the 3 switches in the bathroom have the black line in wire going to the bottom of one switch and then jumping to the bottom of the other two switches. According to the schematic if I replace the one 12/2 with a 12/3 going up to the exhaust fan/light the new black wire going to the yellow in the unit will now have to be tied into the bottom of one of the switches in the bathroom so it will always be hot, right? Thanks again for the help
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Old 07-07-2013, 04:11 PM   #5
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Check out this diagram ( you will have to scroll down a little ) on page 3 and there is 4 differnt way you can do this.

http://www.broan.com/common/productD...2-23fc175dede4

Bon Chance .,

Merci,
Marc
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Old 07-07-2013, 06:14 PM   #6
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please check out this wiring diagram


Quote:
Originally Posted by rjniles View Post
Use only 1 of the whites to supply the neutral to the unit. Remark the other as hot and use it to supply power to the fan yellow lead. This is a minor code violation.
I would do this. Too small of a "violation". Just don't tell
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Old 07-07-2013, 07:55 PM   #7
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please check out this wiring diagram


Quote:
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Use only 1 of the whites to supply the neutral to the unit. Remark the other as hot and use it to supply power to the fan yellow lead. This is a minor code violation.

.
What code violation?
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Old 07-07-2013, 08:46 PM   #8
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What code violation?
All conductors of a circuit should be in the same the same cable sheeth.
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Old 07-07-2013, 08:57 PM   #9
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All conductors of a circuit should be in the same the same cable sheeth.
Non code issue with NM type wiring methods. Of course, this probably doesnt apply to the OP, BUT, he could just cut a slot between cable knockouts and still meet code.
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