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Thermal Solar Setup Questions

  • 20-09-2022 10:45am
    Registered Users Posts: 145 ✭✭


    Hoping someone can help me by answering a few questions. I've a thermal solar setup but I don't think it's set up correctly, it was part of a new build so it came with the house, it's working OK on most days but on sunny days the pump doesn't seem to ramp up enough and often goes into overtemp protection with over 200C at the collector.

    I noticed a few months after we moved in the pump was shutting down even though the controller was calling for 100% pump speed, turns out the pump wasn't on the right setting (on Auto mode rather than PWM mode so wasn't receiving any requests from the controller). So I don't have much faith in the rest of the set-up being correctly installed.

    Contoller is a Joule DeltaSol BS HE, the Pump is a UMP3 Hybrid, Picture of the setup:

    Q1) Is the expansion tank OK the way it is or should it be below the pump like I've seen in some brochures online? The label on it is currently upside-down so that's another thing that would lead me to believe it's placed wrong.

    Q2) I've the pump now set to PWM C Profile (the first one it this pic), is this the correct mode?

    Q3) The PWM cable from the pump has 3 cables, Black (PWM Output), Brown (PWM Input) and Blue (Signal ref), whereas the contoller has 2 connections PWM- and PWM+, I came across another post where someone has connecred Brown (PWM Input) to PWM+ and Black (PWM Output) to PWM- is this correct? The installer used the Blue and Brown cables and left the Black unconnected.

    Hopefully someone has a similar setup or is an installer and can check the modes and wires.