pool/spa heater: convert 3 phase to single phase

GetDeviceInfo

Joined Jun 7, 2009
2,273
In your case, with 3 x 15.6 ohm heaters, you would do as suggested, paralleling them across a 2 pole, 240v source (no neutral), resulting in 11k watts, at a 46 amp draw
If your unit was wired 3 phase Y, it would only produce 3k watts.

This may have been similar to the OPs machine, but we may never know.
 
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BCAnderson

Joined May 6, 2021
24
In your case, with 3 x 15.6 ohm heaters, you would do as suggested, paralleling them across a 2 pole, 240v source (no neutral), resulting in 11k watts, at a 46 amp draw
If your unit was wired 3 phase Y, it would only produce 3k watts.

This may have been similar to the OPs machine, but we may never know.
So you are saying that if I wire it as I proposed in Post #35 that I would only get 3kw of power out of the heater?
 

GetDeviceInfo

Joined Jun 7, 2009
2,273
So you are saying that if I wire it as I proposed in Post #35 that I would only get 3kw of power out of the heater?
Yes
Your conversation indicates a basic understanding, and I’m assuming you could calculate that.
As mentioned by Max, your voltage across any element is going to be ~120vac.
 
Howdy, I have a correction to make. I stated that I had exactly the same model as the OP. I do not. He has one heating element and it's located in the upper tube of the "U". Mine has two heater elements one in the upper tube and one in the lower tube. This is how they are wired:
OEM Heater Wiring.jpg

I am assuming that the resistance is approximately 30 ohms.
 
It looks like I've actually reduced the amount of the heat generated either way if I change the OEM wiring???

OK, so if I increase the resistance, I reduce the current and so reduce the amount of heat generated. Hopefully, ignorance can be cured. Thank ya'll for your patience and assistance.
 
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