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Old 07-22-2012, 09:57 PM   #1
krazydave
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Default How many gas valves can a doorbell transformer safely operate?

I'm working on acquiring all of the parts for my brutus build and picked up a tri-voltage doorbell transformer from Home Depot to control the gas valves. I will also be using it to power some 22mm LED indicator lights on my control panel.

The question is, can one of these transformers safely operate three Honeywell valves and 4 24VAC LED indicator lights? I don't see a VA rating on the transformer anyplace, so I'm hoping that someone has a little experience with it.

Thanks!



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Old 07-22-2012, 10:27 PM   #2
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Sorry but the door bell transformer is not able to do this without burning up, here is a link to a 75VA transformer with enough capacity to handle 3 valves http://www.pexsupply.com/Honeywell-AT175A1008-Foot-mounted-120-208-240-Vac-Transformer-w-9-in-Lead-Wires-75VA-11016000-p.



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Old 07-23-2012, 12:25 AM   #3
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Thanks! What do you wire the four lead wires on that one to?

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Old 07-23-2012, 12:32 AM   #4
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The white and black leads are for 120V use, cap the red wire, and the orange wire separately, not together, as they are not used for 120V operation and will have power on the leads.

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Old 07-23-2012, 12:37 AM   #5
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Awesome. Thanks!
I usually pick up electronics and wiring pretty easily, I just haven't dealt with transformers a whole lot.

I'll go ahead and order that one and return the doorbell transformer to HD.

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Old 08-10-2012, 08:52 AM   #6
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For future reference add all of the amps. ,milliamps and line draws and double that number. This will give pretty close to the max current you could experience if all items were operated at the same moment. That will also give you a good safety margin to go by also. Ohms law provides an equation to determine Power, Amperage and Capacity. Hope this helps.
Bob



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