Anyone have source for a timer switch that can be turned on/off from 2
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
I believe that would be a DPDT timer switch??
If you wire two spring wound timers in parallel, then the fan will run
for the longer of the two settings. Since each turns on the fan for
what the user thinks is the right amount of time the longer time of the
two serves the purpose, no real need to shutoff the other switch. If
they are wired in parallel then you can use inexpensive SPST timers
with 14-2 wire 9no need for a neutral to the timers as they are spring
wound). The wiring runs are easier since its just direct from each
timer to the fan, no looping between bathrooms. The Intermatic units
are about $10 at the Borgs and fit both Decora and regular wall plates.
Such switches are available but they are bulky and somewhat pricey.
Mount a relay or contactor at the fan that is turned on by a timer
relay. Set the timer relay for whatever length of time you feel is
appropriate. The timer relay is started by a momentary contact switch
that can be located in each bathroom served.
"This alternating current stuff is just a fad. It is much too dangerous
The drawback to this is that the timer duration is fixed at the
controller, rather than the switches. I suspect you'd
have to assemble it out of gear that isn't normally intended for
end-user/consumer use, and may require some creative carving
(eg: mounting thread-mount momentary switches in holes drilled in
blank face plates, or industrial momentary switches, or industrial
time delay relays, or Radio Shack components (not necessarily
code-rated for the purpose) etc).
A simpler, likely less expensive approach would be two ordinary timers
as suggested elsewhere, with the switched legs tied together at the
fan power lead. The fan goes on just as long as the "last timer"
You'd have to be careful with this - both timers would _have_ to be
on the same circuit, and it would probably be safest to use timers
that have mechanical relay contacts rather than fully electronic.
[I personally prefer fully mechanical "windup" timers for fan
[Momentary switches as you suggest would probably ALSO have to
be on the same circuit. Or some hackery with X10 or whatever...]
That said - do you think hooking two timers (or ordinary switches
for that matter) in parallel like this is code-legal?
I suspect it's legal, because it's almost identical to an ordinary
three way setup triggering a timer (which might be confusing, but
it should be legal).
Chris Lewis, Una confibula non set est
It\'s not just anyone who gets a Starship Cruiser class named after them.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.