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View Full Version : DIY 4 x 40 RO Control Box Wiring.



craigwade2005
11-25-2022, 01:10 PM
Just as the title suggests, I am working on a single 4 x 40 RO with a 110V 3/4 HP motor. The design is based on Woodbutchers post. While I could go with a simple switch, I plan to use a control box with a few safety features. Below is my plan, however I'm scratching my head as to how to wire it all. If anyone could help with some solutions or a diagram that would be greatly appreciated.

Lighted start / stop switches
Geya 3 pole magnetic contactor with overload.
PID contoller for overtemp. Some sort of disconnect relay.
Nason low pressure shutoff switch with relay.


I think I have a pretty good idea about a standard start stop circuit, but the extra safeties are a bit confusing to me. Can a 3 pole contactor/overload be used in this scenario in case I update to 220V in the future. Below are the parts I currently have along with a photo of Woodbutchers design. Thanks!!
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minehart gap
11-27-2022, 04:18 PM
I would think that a high pressure shut off would be more important than the temperature function. Just my thoughts.