12v relay w/ dehumidfier mod?

723 Views 4 Replies 2 Participants Last post by Solaritu, Jan 11, 2016

Solaritu

Discussion Starter · Jan 8, 2016

I was thinking about picking up a random SPDT 12v relay from an automotive store connecting my 12v trigger on my projector and wiring the relay to the leads of the float switch inside the dehumidifier. It would connect to the normally open lead of the relay so when I power on the projector, it shuts off the dehumidifier that is in the same room.

As this is a low voltage application, is there any reason why a simple SPDT 12v relay from an automotive store not work?

I was also thinking of wiring this thing in series with my condensation pump so if the pump fails, it will kill the dehumidifier as well.

Thanks in advance!

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Bob Sanders

· #2 · Jan 8, 2016 (Edited)

Solaritu said:
As this is a low voltage application, is there any reason why a simple SPDT 12v relay from an automotive store not work?

The control portion from the projector may be low voltage, but is the humidifier control circuit low voltage as well? I know your condensate pump is most likely 120V, right?

You need a properly rated and ul certified relay if you're connecting any portion of it to 120V.

You will also wreck any ul certification on the humidifier and pump if you open them up and play with the wiring.

Best bet is certified and compliant relay controlling an outlet which the pump and humidifier are plugged into.

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Bob Sanders

· #4 · Jan 9, 2016

That will work fine. It's probably low voltage on the float circuit as well. You will wreck the UL certification on the machine though

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