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-   -   Bathroom Vent Fan wiring help (http://www.diychatroom.com/f18/bathroom-vent-fan-wiring-help-158545/)

fabster 10-01-2012 07:55 AM

Bathroom Vent Fan wiring help
 
Hi all,

I am working on installing a new vent fan in a bathroom where one did not exist. I will feed it from the same circuit as the vanity light which comes from a junction box in attic. The model of the fan is the Panasonic FV-08VKS3. I have a couple of questions regarding the wiring diagram and user experience on this.

Here are the wiring diagrams for the model:
http://s18.postimage.org/id8bbc0cp/W...een_wiring.gif

http://s16.postimage.org/sh5j5p6dh/W...en_wiring2.gif

Does this mean that I can connect my power supply directly from the junction box in the attic for the continuous ventilation and then bring it down to the switch with 14/2 wire to my switch for the HIGH? That seems strange to me (although easiest) because someone may think they have shut off power to the fan by disconnecting from the switch. Am I correct?

Thanks.

fabster 10-02-2012 09:07 PM

Am I missing some important information here to clarify my question or is this just so moronically simple that it doesn't warrant an answer? help.

AltaSparky 10-02-2012 09:15 PM

Did the fan come with a speed switch? It looks to me like the fan has one constant hot and 2 wires for control so you have 2 different speeds.

What you are talking about seems like it would work with the 14-2. In the USA there are some rules about a neutral being at the switch that don't apply to me here in Canada.

fabster 10-02-2012 09:29 PM

AltaSparky, Thanks! So yeah, this fan has the funny feature of having a constant on at a lower speed then a high speed mode for a pre-set time when the switch is flipped. It returns to the lower fan speed after that time. So my confusion is whether it would be okay to have the constant hot come from the attic and only have wires to/from the switch. I am assuming I would use 14/2 romex to connect the red wires to the switch.

Actually, that is part of my follow up question for those who may have used/installed these in the past. I had read somewhere that the switch needs to be flipped on then off, almost immediately, then it would run for the pre-set time. I imagined it differently when I bought it that if I turned it on while in the bathroom then turned it off, the fan would be working for the pre-set time after I turn it off. (e.g. pre-set time is 40mins. I use the bathroom for 10mins then turn it off. it would be turned on for a total of 50mins) Am I correct?

AltaSparky 10-02-2012 09:57 PM

Quote:

Originally Posted by fabster (Post 1022554)
AltaSparky, Thanks! So yeah, this fan has the funny feature of having a constant on at a lower speed then a high speed mode for a pre-set time when the switch is flipped. It returns to the lower fan speed after that time. So my confusion is whether it would be okay to have the constant hot come from the attic and only have wires to/from the switch. I am assuming I would use 14/2 romex to connect the red wires to the switch.

Actually, that is part of my follow up question for those who may have used/installed these in the past. I had read somewhere that the switch needs to be flipped on then off, almost immediately, then it would run for the pre-set time. I imagined it differently when I bought it that if I turned it on while in the bathroom then turned it off, the fan would be working for the pre-set time after I turn it off. (e.g. pre-set time is 40mins. I use the bathroom for 10mins then turn it off. it would be turned on for a total of 50mins) Am I correct?

In Canada that would be a compliant install. I can't speak for the NEC on neutral in switches. You may have to run a 14/3.

I looked at the instructions for the model, and it seems to me that when you have the switch on, the fan will run at its maximum CFM(airflow). When you turn the switch off you fan will then be controlled by what you have your CFM and TIME settings set at.

fabster 10-05-2012 12:27 PM

Can you explain why you'd use 14/3 instead of 14/2? Is it so that you can have the black and red connected to the switch so there's no confusion as to what's "hot"? Thanks!


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