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General: Sorel controller ModvSol S

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  1.  
    Hi

    Can anyone advise on a set up problem with this controller ModvSol S ?
    It should be a very basic S1 S2 temperature difference pumped operation between the panels sensor and solar pocket sensor.
    The instruction Manual only illustrates various S1 S2 scenarios.
    However when I turn the system on it illustrates S1 S2 and S3.
    S1 shows nothing
    The expected S1 reading is shown as S2 (48 degrees when I put the tubes in late this afternoon)
    The expected S2 reading is shown as S3 (16 degrees at the solar coil area at the base of the cylinder)

    The system is not running/pumping at all and I am very worried that the collectors are going to overheat if the sun returns tomorrow.

    The pre wired box seems to be wired correctly.

    Do these symptoms mean anything to anyone?!!

    Thanks
    • CommentAuthorphiledge
    • CommentTimeNov 17th 2023
     
    Are you certain you've got the sensors wired to the correct terminals? Quick Google search suggests that terminals for the sensors are wired with the collector sensor S1 wired on the right 2 ELV terminals, then the bottom cylinder sensor S2 wired to the next 2 terminals to the left of S1. S3 seems to be an optional temperature sensor which could be used for cylinder top temp
    • CommentAuthorphiledge
    • CommentTimeNov 17th 2023
     
    Just noticed you mention a pre wired box? The manual I saw seems to have the connections inside the controller and no mention of a pre wired box? Worth checking the wiring between the prewired box and the controller??
  4.  
    Hi

    Sorry - to clarify, the controller sits in a polystyrene slot in the pump station.
    A sensor labeled S2 was already connected to this controller and a sensor twin wire labeled S1 was also already connected.
    I have put the S2 sensor into the lower cylinder pocket and I have connected the S1 sensor cable to the wire running to the sensor in the collector panels pocket.
    I took the back off the controller and the connections did seem to be right way round - I’ll have to take another look.
    If they are, do you have any other thoughts?

    Thanks for your help
    Chris
  5.  
    Just a quick update - the problem is solved!
    I rechecked the wiring order which was correct.
    Scratched my head and then noticed that the pre fitted connector block was positioned one pin out….

    Thanks for the prompt suggestions - much appreciated.
    Can now sleep easy!!

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