Hello Everyone, I need help wiring a submersible 240V 2-wire well pump. I read a bunch of different methods so I would like a second opinion. I read that a 2 wire pump does not need a control box since it's built into the pump itself. However I am reading two method one being you need a pressure switch the other being a relay. Since I'm not using this for drinking water would I just wire to the relay switch then wire from relay switch to breaker box? Then wire my control to the relay to control when the pump kicks on? Help would be appreciated.
KamSwenson
I assume you are using this pump for an irrigation system. In that case your irrigation control will close the master valve output anytime you want a zone to operate. The M/V output cannot directly drive the pump so you need a interposing relay with a 24VAC coil that will then
provide the higher AC voltage need by the pump. Or you can just buy something like the Rainbird PSR Universal Pump Start Relay. More expensive than DIY I talked about, it just depends on your level of expertise.
You do not need or want a pressure switch since you are basically wanting as much water as the pump can put out. If you had a pressure switch it will probably never have the pump shutoff and if it did it would be momentary. You would be cycling the pump on and off constantly which is not good for any of the components.
This diagram is the Rainbird PSR wiring.
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provide the higher AC voltage need by the pump. Or you can just buy something like the Rainbird PSR Universal Pump Start Relay. More expensive than DIY I talked about, it just depends on your level of expertise.
You do not need or want a pressure switch since you are basically wanting as much water as the pump can put out. If you had a pressure switch it will probably never have the pump shutoff and if it did it would be momentary. You would be cycling the pump on and off constantly which is not good for any of the components.
This diagram is the Rainbird PSR wiring.
+1 on the rainbird setup.
If you aren’t familiar with wiring, relays and switches, you are better off hiring a professional. Working with 220 is no joke and can result in a bad situation.
If you aren’t familiar with wiring, relays and switches, you are better off hiring a professional. Working with 220 is no joke and can result in a bad situation.
Non US colors
Yellow-green is ground
Blue is neutral
Brown is hot
Red is hot
Curious they have a neutral for a 240v pump. Only need it if you need 110 at the pump.
IEC standards don’t use 2 hots for 220 since they don’t have 110, just 220 single phase. I am assuming the red is odd ball since it is for US market.
Verify before hooking up
Yellow-green is ground
Blue is neutral
Brown is hot
Red is hot
Curious they have a neutral for a 240v pump. Only need it if you need 110 at the pump.
IEC standards don’t use 2 hots for 220 since they don’t have 110, just 220 single phase. I am assuming the red is odd ball since it is for US market.
Verify before hooking up
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