Tandem Switch

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Felix Participant Join Date: May 2006 Posts: 2	Tandem Switch 09/15/2006 1:59 AM
	Is anyone here familiar with switches? I am looking for a switch that will control two seperate ciruit simultaneously. ie, if i only have to push one button to close both circuit. And I prefer one that would have the option only Hi or Lo setting, not Off (not sure if there are switches that has no Off position). And also keep in mind that, between the two circuits, one is high voltage, 240V, the other one is for a gas valve, which requires no external power source. I am trying to design a circuit for a fireplace. It is necessary to have the fan on for safe operation. So I'm trying to figure out a way to make a fool-proof system, so that when the person flicks the switch, it turns both the fan and the burner at the same time. I also have other components in the circuit for safety shut-off. Anyway, if anyone can shine the light in the right direction for me, it would be much appreciated. Thanks all!!
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Garthh Guru Join Date: Dec 2005 Location: Mariposa Ca Posts: 5800 Good Answers: 114	#1 Re: tandem switch 09/15/2006 3:16 AM
	You don't need a stacked switch per say [though it's obtainium] You need a Fireye. You can buy 1 from allen-bradley. Honeywell makes a real trick unit that has spark & flame detection on the same wire, internal relays. I've used 24vac &120vac units, they probably make 240vac too. Garth
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silverocks Associate Join Date: Jun 2006 Posts: 25	#2 Re: tandem switch 09/15/2006 8:45 AM
	Sounds like you need a 3 position double pole, double throw switch (3Pos DPDT). One pole is for the the fan, the other for the valve. Center position all off, up position fan hi & valve on, down position fan low & valve on. If you have a two position valve, wire one coil to the hi position and one to the low position. Newark inOne Electronics Supply is one source.
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Jeff Member Join Date: Sep 2006 Location: Reading Pa. Posts: 5	#3 Re: Tandem Switch 09/15/2006 11:50 PM
	You could use a dpdt switch. There is one that will satisfy your requirements __________________ Remember The 343 !
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Anonymous Poster	#4 Re: Tandem Switch 09/16/2006 7:41 AM
	For your own safety, and those around you, buy a ready-made control.Ad-hoc mechanisms for controlling gas and spark are very dangerous.If you have to ask how to do it, you do not have enough experience to do it. Merely acting on instructions from a web link can get someone seriously hurt or worse.My advice: This is not a DIY project!
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Delmar Power-User Join Date: Sep 2006 Location: Houston Texas Posts: 282 Good Answers: 16	#5 Re: Tandem Switch 09/16/2006 2:48 PM
	Sounds like it would be much easier to install a standard switch, and use two relays for controlling the valve and fan. You can install a latching circuit to prevent the valve relay from energizing until the fan proofs on. Regards, Delmar Schmidt Melfi Technologies Houston dschmidt@melfitechnologies.com __________________ Specializing in Dynamic Weighing Systems for Powder and Bulk Solids Handling
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Anonymous Poster (1); Delmar (1); Garthh (1); Jeff (1); silverocks (1)

You might be interested in: Thermostats and Thermal Switches, Circuit Breakers

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