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Rank 2
Maurice Kelly
Rank 2
April 2, 2023
Solved

Ecodan 'Coeffeciency of Performance', can I improve it?

  • April 2, 2023
  • 50 replies
  • 2394 views

Ecodan COP

Good morning 

 , I have just looked at the COP for March and seems to be 1.25 , which I believe is poor. 1.48 DHW and 1.10 for heating . I have the heating on weather compensation mode and hot wat at 45c eco mode .  New system just in since end of January so new to all of this !!!  4 bed detached , no UFH , 20c downstairs and 18c upstairs . 10 PV solar panels 4kw. Anything I should do to improve COP?

    Best answer by M.isterW

    There are three ways to run an Ecodan heat pump 

    1 - Fixed flow temperature. The system always produces water at the same temperature and you generally use a thermostat in the house to tell it when to turn on and off.

    2 - Weather compensation. The system heats water to different temperatures depending on the outside temperature. It requires no internal thermostat because you set the compensation curve so it heats the house just enough and no more.

    3 - Auto adaptation. This uses the wireless mitsubishi thermostat and manages the flow temperature to keep the house at your ideal temperature while trying to maximise efficiency.

     

    I wonder if yours is set to weather compensation but the internal thermostat is stopping it performing correctly. Lots of people find that auto adaptation gives better, and more efficient, results so can I suggest you try that?

    50 replies

    juliamc
    Rank 20
    juliamc
    Rank 20
    April 2, 2023

    Are you running the heating on a schedule @Maurice Kelly ? It’s should be on all the time for best efficiency (with poss a setback of a degree or two overnight).

    Can you describe a bit more about the components of the system ? 

    Can you see the flow rate ? My system has a better cop on dhw than heating which seems to be because the flow rate was higher doing the dhw. (My problem has been diagnosed as low refrigerant - to be checked by my installer soon)

    What does your installer have to say about the low cop ?

    nb don’t despair !! Heat pumps are great !!

      M.isterW
      Rank 6
      M.isterW
      Rank 6
      April 2, 2023

      Do you have something controlling the internal temperatures? A thermostat or TRVs?

      1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
        M
        Rank 2
        Maurice KellyAuthor
        Rank 2
        April 2, 2023

        Good morning , 

        two thermostats one on each floor . See attached re flow rates from the system info .  Running constantly not on timer . Weather comp mode , 39/-3c  25/12c

         

        M.isterW
        Rank 6
        M.isterW
        Rank 6
        April 2, 2023

        Your thermostats could be fighting with the main controller and causing problems with flow temperature. Are your thermostats Mitsubishi wireless units. Like this? 

        https://les.mitsubishielectric.co.uk/products/residential-heating/control/wireless-controller-and-receiver

        1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
          M
          Rank 2
          Maurice KellyAuthor
          Rank 2
          April 2, 2023

          Yes both like that . What would the issue be? Or how could I check ?  

           

          juliamc
          Rank 20
          juliamc
          Rank 20
          April 2, 2023

          What cop were you getting in feb ? Do you have a buffer tank ?

          What have the outdoor temps been like, where do you live ?

            M.isterW
            Rank 6
            M.isterWSolved
            Rank 6
            April 2, 2023

            There are three ways to run an Ecodan heat pump 

            1 - Fixed flow temperature. The system always produces water at the same temperature and you generally use a thermostat in the house to tell it when to turn on and off.

            2 - Weather compensation. The system heats water to different temperatures depending on the outside temperature. It requires no internal thermostat because you set the compensation curve so it heats the house just enough and no more.

            3 - Auto adaptation. This uses the wireless mitsubishi thermostat and manages the flow temperature to keep the house at your ideal temperature while trying to maximise efficiency.

             

            I wonder if yours is set to weather compensation but the internal thermostat is stopping it performing correctly. Lots of people find that auto adaptation gives better, and more efficient, results so can I suggest you try that?

            1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
              M.isterW
              Rank 6
              M.isterW
              Rank 6
              April 2, 2023

              If you don't mind me asking, who specified and installed it? This information is something your installer should have talked about with you.

              1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
                M
                Rank 2
                Maurice KellyAuthor
                Rank 2
                April 2, 2023

                Hi , 

                Ok I followed the process to set up with weather compensation mode and then pressed the auto adapt (as per video instruction) , would this be where I’ve gone wrong ? Re the internal thermostats are they not just telling me water temp each floor is set to and currently reading ? How do they interfere with efficiency ?

                Should I put it on weather compensation mode and see if that improves the COP ? 
                 

                installed by plumber during retrofit , didn’t spend a huge length of time with me on the settings . 

                Thanks

                Maurice 

                M
                Rank 2
                Maurice KellyAuthor
                Rank 2
                April 2, 2023

                What cop were you getting in feb ? Do you have a buffer tank ?

                What have the outdoor temps been like, where do you live ?

                Similar Cop for both months 

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