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#1
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3way (DPDT) timer switches
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?? |
#2
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3way (DPDT) timer switches
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........ |
#3
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3way (DPDT) timer switches
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?? sounds like you just need to wire two ordinary SPST switches in PARALLEL. Then either switch can turn it ON. Mark |
#4
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3way (DPDT) timer switches
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. On Oct 10, 1:03 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?? |
#5
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3way (DPDT) timer switches
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?? 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. -- Tom Horne "This alternating current stuff is just a fad. It is much too dangerous for general use." Thomas Alva Edison |
#6
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3way (DPDT) timer switches
On 10 Oct 2006 10:12:53 -0700, "z" wrote:
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. |
#7
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3way (DPDT) timer switches
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. . |
#8
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3way (DPDT) timer switches
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 |
#9
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3way (DPDT) timer switches
According to Tom Horne, Electrician :
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. 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" says to. 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 timer applications.] [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. |
#10
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3way (DPDT) timer switches
Goedjn wrote: 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 I dunnit... when I bought the house, found one b-room vented outside but one b-room vented into the attic, so just Y-connected it into the duct because I hate to punch holes in my house, and I noticed that both fans had flapper door dampers built in to produce at least some isolation from each other, and from backflow from the outside. And yes, I do feel some backflow of warm humid air from one b-room into the other (mostly when it's cold enough to feel such a thing) but it's not like a detectible draft from a fan and doesn't bring the humidity in the recipient room up much at all; and I don't detect any stench because my poop smells like a mountain meadow. Although I did pick up a couple of cheap plastic flapper dampers last time I was at HD to install some time to see if it makes any difference over the built in ones. |
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