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John asked How do i make a timed switch?
I need to create a timed switch (about 8 hours long) that will turn on when the user presses a button and turn off 8 hours later. i don't know voltages... so i just need possible parts. its for a boiler, so it will probably be 12-120 volts. Can i get the IDEC RTE at lowes/home depot? or do i need to order it online? thanks! The control circuit is 120v. just adding details as i find them.
And got the following answer:
This is kind of funny. Last week I had the same need for an air compressor. I looked around for ready made timers and did not find anything. So I drew up a wiring diagram to make my own timer. Parts List: 1 - Momentary Normally Open pushbutton switch for Start 1 - Momentary Normally Closed pushbutton switch for Stop. 1- DPDT control relay with appropriate coil voltage 1- IDEC brand RTE timer. The exact model will depend on the control voltage. http://us.idec.com/Catalog/ProductSeries.aspx?FamilyName=Timers&SeriesName=RTE_Series 2- relay bases. One to fit the control relay and one for the IDEC timer. Wiring: L1 goes to one side of the of the start button and one of the N.O. contacts on the control relay. connect a wire from the other side of the start button to the other side of the N.O. relay contact and from there to one side of the stop button. From the other side of the stop button connect a wire to a N.C. contact on the timer. Then from the other side of the N.C. timer contact connect a wire to the coils of the control relay and the timer. Connect L2 to the coils on the timer and control relay. Use the second N.O. contact on the control relay to switch your load. Operation: press start - power passes through N.C. Stop button and N.C. timer contact to pull in both the timer and control relay. As the control relay energizes, it closes contacts in parallel with the start button which will maintain power to both holding coils. The timer will count from 1 sec to 100 hours depending on the setting. Once the timer times out, the N.C. contact will open. With the Timer contact open, the timer will stop counting and the control relay will de-energize. The stop button was included to stop the circuit at any time before the timer times out. Let me know if you need a wiring diagram. ******Additional****** I buy IDEC relays and timers at the local electrical supply house. Hardware stores like Lowes or Home Depot do not carry these items. There are several companies that make On-Delay timers that will work. Graingers has several suitable timers listed but all of them are pretty expensive. I use an IDEC RTE-P1-AF20. This is for 100 to 240 VAC. Any timer with On-Delay and around 10 amp N.C contacts and a coil with the appropriate voltage will work. Here is a source online. I have ordered from Allied before. They are about $10 higher than I pay locally but Allied is fairly trustworthy. http://www.alliedelec.com/search/searchresults.aspx?Ntt=rte&Ntk=Primary&i=0&sw=n&N=4294965228 ******Yet More****** Here are part numbers for the relay, bases and timer you could get from your local Graingers. But, like I said, Graingers is pretty high priced. http://www.grainger.com/Grainger/OMRON-Relay-2W919?Pid=search http://www.grainger.com/Grainger/DAYTON-Relay-Socket-5X852?BaseItem=2W919 http://www.grainger.com/Grainger/DAYTON-Time-Delay-Relay-6A854?Pid=search