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Old 09-20-2013, 11:02 PM   #1
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Default 120V to 24V Transformer Blew

One of my transformers for my honeywell valves blew unexpectedly. I didn't think that there was any kind of short circuit in my wiring, but after being on for about 3 minutes it blew. With my recent rewiring, the two transformers that I have are actually not touching. Would that have caused an issue? or do I need to revisit how I have them wired. I know they have 120 V coming in. They are not grounded though.
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Old 09-20-2013, 11:35 PM   #2
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Sounds like it was wired backwards
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Old 09-21-2013, 12:01 AM   #3
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Passed too much current on the secondary side is my guess. Got a diagram you can show us? It's good idea to fuse the secondary to prevent this in the future.
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Old 09-23-2013, 09:47 PM   #4
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Test the ohms on your gas valves. If one is really low its shorted and will blow another transformer. Replace the valve in that case, the transformer and add a fuse. If you have any other coils like actuators check them also. If you don't know what the ohms should be you can install the fuse first and start plugging things in until the fuse blows and you found it.
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Old 11-10-2013, 04:27 PM   #5
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Here is how I have everything wired.
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Old 11-10-2013, 08:27 PM   #6
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I just saw that you are in Charlotte. Are you a CBM member? There are plenty of members with the skills to solve this problem and wouldn't mind helping, including myself.
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Old 11-10-2013, 08:45 PM   #7
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I'm actually about to join
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Old 11-16-2013, 03:08 PM   #8
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could it be a ground issue? the pump is the only thing grounded on my system, but its the only component that has a ground wire on it.

do both valve wires go to the transformer? or should one go back to the neutral bus?
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Old 11-24-2013, 05:01 AM   #9
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No takers?
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Old 11-25-2013, 01:30 PM   #10
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Quote:
Originally Posted by sgraham602 View Post
could it be a ground issue? the pump is the only thing grounded on my system, but its the only component that has a ground wire on it.

do both valve wires go to the transformer? or should one go back to the neutral bus?
Both valve wires got to the transformer, no neutral connection.
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