All rads working with HR 92 EVOHOME bar one1!

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  • dafydd
    Automated Home Jr Member
    • Mar 2020
    • 13

    All rads working with HR 92 EVOHOME bar one1!

    I've just fitted my system with the help of a good electrician. All the rads are working in harmony with the HR 92's but one rad is getting hot whenever the hot water is on! Its HR92 is set to off, but still gets hot! I've set it to full stroke, parameter 6, but no joy. Any advice welcome!!
    DW
  • G4RHL
    Automated Home Legend
    • Jan 2015
    • 1580

    #2
    Originally posted by dafydd View Post
    I've just fitted my system with the help of a good electrician. All the rads are working in harmony with the HR 92's but one rad is getting hot whenever the hot water is on! Its HR92 is set to off, but still gets hot! I've set it to full stroke, parameter 6, but no joy. Any advice welcome!!
    DW
    Check the pin in the valve moves easily. Take the HR92 off and push the pin in and out a few times. It may be stuck and the HR92 not able to depress it.

    Comment

    • anniesboy
      Automated Home Sr Member
      • Aug 2019
      • 71

      #3
      Also see this https://www.youtube.com/watch?v=kEAD-IkXRrY

      Comment

      • dafydd
        Automated Home Jr Member
        • Mar 2020
        • 13

        #4
        Originally posted by G4RHL View Post
        Check the pin in the valve moves easily. Take the HR92 off and push the pin in and out a few times. It may be stuck and the HR92 not able to depress it.
        How difficult should it be to move the pin? Should I be able to move it with a finger?
        many thanks for the advice and the video!
        Dafydd

        Comment

        • anniesboy
          Automated Home Sr Member
          • Aug 2019
          • 71

          #5
          You tube for advice https://www.youtube.com/watch?v=U-FXzt6Eo_c

          Comment

          • G4RHL
            Automated Home Legend
            • Jan 2015
            • 1580

            #6
            Originally posted by dafydd View Post
            How difficult should it be to move the pin? Should I be able to move it with a finger?
            many thanks for the advice and the video!
            Dafydd
            You should be able to. When I have done I have used the flat side of a knife blade to make it easier.

            What I am not sure about advocating, and others here can certainly confirm or otherwise, is whether it is wise to use WD40 on it.

            Comment

            • DBMandrake
              Automated Home Legend
              • Sep 2014
              • 2361

              #7
              If a TRV valve body is seizing, spraying any sort of rust penetrant or lubricant in the top down the pin is unlikely to help. In ones I have removed/replaced the pin rusts down inside the body where the water flow is - this is below the o-ring that seals the pin for leakage. So this o-ring will also prevent any lubricant getting down to where it needs to be.

              If the pin can't be pressed down with a thumb against the endge of a knife blade it's probably seized. Another way to check is to try turning the black wheel on the HR92 fitting - it should turn about 2-3 turns clockwise from the top and be quite easy to turn by hand due to the leverage of the plastic screw. If it's not easy or doesn't turn far the pin is also seized. Don't force it if it feels tight as the screw is only made from plastic.

              If it's seized I'd say replacement is the only option even though that probably means calling in a plumber for most people on an already filled/pressurised system. Be careful to choose a valve body that is compatible with the HR92 - while any M30 x 1.5 body will in theory work, they all have differences in pin stroke, pin length etc which can cause issues. If the other valves around the house seem to be working properly then I'd probably try to get the exact same valve as used elsewhere in the house, provided it's of decent quality.

              Comment

              • dafydd
                Automated Home Jr Member
                • Mar 2020
                • 13

                #8
                Originally posted by DBMandrake View Post
                If a TRV valve body is seizing, spraying any sort of rust penetrant or lubricant in the top down the pin is unlikely to help. In ones I have removed/replaced the pin rusts down inside the body where the water flow is - this is below the o-ring that seals the pin for leakage. So this o-ring will also prevent any lubricant getting down to where it needs to be.

                If the pin can't be pressed down with a thumb against the endge of a knife blade it's probably seized. Another way to check is to try turning the black wheel on the HR92 fitting - it should turn about 2-3 turns clockwise from the top and be quite easy to turn by hand due to the leverage of the plastic screw. If it's not easy or doesn't turn far the pin is also seized. Don't force it if it feels tight as the screw is only made from plastic.

                If it's seized I'd say replacement is the only option even though that probably means calling in a plumber for most people on an already filled/pressurised system. Be careful to choose a valve body that is compatible with the HR92 - while any M30 x 1.5 body will in theory work, they all have differences in pin stroke, pin length etc which can cause issues. If the other valves around the house seem to be working properly then I'd probably try to get the exact same valve as used elsewhere in the house, provided it's of decent quality.
                Many thank for all the help, it's really appreciated. I tried the pin and it moves ok. Had another think and checked some other things. I've discovered the trv is fitted to the outflow of the rad and not the flow in. So Im guessing although the valve is closed the rad' still gets hot. Does this mean I have to switch the trv and the 'stopped' valve around?

                Comment

                • DBMandrake
                  Automated Home Legend
                  • Sep 2014
                  • 2361

                  #9
                  Originally posted by dafydd View Post
                  Many thank for all the help, it's really appreciated. I tried the pin and it moves ok. Had another think and checked some other things. I've discovered the trv is fitted to the outflow of the rad and not the flow in. So Im guessing although the valve is closed the rad' still gets hot. Does this mean I have to switch the trv and the 'stopped' valve around?
                  The radiator can only get hot if water flows through it. It doesn't matter whether the valve is on the input or output side, if the valve is closed water won't flow.

                  In fact traditionally valves usually go onto the output side of a radiator (as older valve types would experience water hammer if used on the input side) however modern valves can go on either side.

                  So it's not that.

                  Comment

                  • dafydd
                    Automated Home Jr Member
                    • Mar 2020
                    • 13

                    #10
                    Just goes to show, a little knowledge is a dangerous thing! Thanks for giving me that information otherwise I could have wasted a lot of time trying to switch valves. I guess the valve itself must be faulty so looks like I have to change it for another. Really appreciate all the help. Cheers

                    Comment

                    • filbert
                      Automated Home Guru
                      • Oct 2017
                      • 161

                      #11
                      I guess you’ve done this but check the lockshield on the other side, make sure it’s open enough for the flow to get through.

                      Comment

                      • CT1
                        Automated Home Guru
                        • Apr 2016
                        • 189

                        #12
                        A closed lockshield would prevent the rad from heating up. The OP has the opposite problem. Looks like a new valve is the right solution and I would replace the lockshield at the same time. They are relatively cheap and it would be a pain if it started to leak in a few months time.

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