3way (DPDT) timer switches

Posted by Jack on October 10, 2006, 1:03 pm

Anyone have source for a timer switch that can be turned on/off from 2
locations?

I have a bathroom fan mounted in attic that services 2 bathrooms, would
like a timer in each bathroom that would only allow it to run for short
time, especially because it is very quiet, so it could be easily
forgotten about.

I believe that would be a DPDT timer switch??

Posted by z on October 10, 2006, 1:12 pm

Jack wrote:

> Anyone have source for a timer switch that can be turned on/off from 2
> locations?
> I have a bathroom fan mounted in attic that services 2 bathrooms, would
> like a timer in each bathroom that would only allow it to run for short
> time, especially because it is very quiet, so it could be easily
> forgotten about.
> I believe that would be a DPDT timer switch??

Not really, you need two SPST switches but connected in parallel. I
must say that logical as it seems, I've never heard of such a
hookup.... any reasons why it wouldn't be feasible/safe/according to
code? You'd definitely want to hook them up to the same breaker, for
safety when you "turn the power off" to work on them........

Posted by Goedjn on October 10, 2006, 3:43 pm

>Jack wrote:

>> Anyone have source for a timer switch that can be turned on/off from 2
>> locations?
>> I have a bathroom fan mounted in attic that services 2 bathrooms, would
>> like a timer in each bathroom that would only allow it to run for short
>> time, especially because it is very quiet, so it could be easily
>> forgotten about.
>> I believe that would be a DPDT timer switch??

>Not really, you need two SPST switches but connected in parallel. I
>must say that logical as it seems, I've never heard of such a
>hookup.... any reasons why it wouldn't be feasible/safe/according to
>code? You'd definitely want to hook them up to the same breaker, for
>safety when you "turn the power off" to work on them........

Well, in order to work, that means that the vents to the
two bathrooms have to be interconnected, which isn't
a good idea.

Posted by Jack on October 10, 2006, 5:13 pm

> Well, in order to work, that means that the vents to the
> two bathrooms have to be interconnected, which isn't
> a good idea.

Why is it not a good idea... batrooms are back to back.. both hoses
take air out of bathroom.. go into a fan unit in the attic and it blows
the air out the top of the roof.. not understanding the problme with
that.. what am I missing. .

Posted by Goedjn on October 10, 2006, 6:00 pm

>Why is it not a good idea... batrooms are back to back.. both hoses
>take air out of bathroom.. go into a fan unit in the attic and it blows
>the air out the top of the roof.. not understanding the problme with
>that.. what am I missing. .

I don't know for sure, it's just on my list of things not to do.

I think it has to do with creating a connection between the
bathrooms, allowing noise and odors to travel between them,
and letting one bathroom, (the one with the open door, and
hence low resistance) provide all the air the fan can draw,
so that the other (with the stench, closed door, and high
resistance) keeps it's oderiferous gasses, but that's all guesswork.

--Goedjn

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