PWM is a Maxx Tronic MX066-1 with an add on frequency adjustment board with 2 pots, one is a B50K the other unmarked. I thought that I could change duty cycle with this adjustment but was wrong or I have it wired wrong! Don't know a lot about electronics. Looking for a little guidance. This pump is circulating water through my parabolic trough on the hot tub. Thought it would be beneficial to turn the pump on and off to give the trough time to heat water to a greater temp.
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