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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

Rank 2
April 2, 2023

Unfortunately our system is a little odd so I've reached the limit of my knowledge. We use a fixed flow temperature which isn't the most efficient way to run the system but we have limitations that stop us using either weather compensation or auto adapt.

 

In your position I would investigate how to get the system set up properly in auto adapt mode. Once it's set up it might take a bit of time to adapt to your house but eventually you should see an improvement in COP.

Ok thanks , sorry for all the questions , new to this . I thought the compensation mode would heat house in sync with outside temps until desired heat house reached as per thermostats temp setting . All a learning curve . 

Rank 2
April 2, 2023

This video explains how to set your system to auto adapt mode https://youtu.be/RX31v4NoQf4

 

 

Thank you must go though this 

Rank 2
April 2, 2023

This video explains how to set your system to auto adapt mode https://youtu.be/RX31v4NoQf4

 

 

Hi

thats a video I used before too . He says it runs the weather compensation mode in the background . I believe my system is already on this mode. They don’t what to do with the thermostats . My system seems to come on for awhile then shuts off for a good period of time . Water and floor stats seem to be at or slightly above their setting all the time. 

 

juliamc
Rank 20
Rank 20
April 2, 2023

You could try lowering the curve values a bit to see if the pump stops switching off. Bit of a stab in the dark. 
 @OrphM62 has an ecodan so may be able to suggest something ?

Rank 2
April 2, 2023

You could try lowering the curve values a bit to see if the pump stops switching off. Bit of a stab in the dark. 
 @OrphM62 has an ecodan so may be able to suggest something ?

Ok , so really the pump /fan should be going all the time ? I turned the auto adapt off so it’s just on compensation mode now . 

juliamc
Rank 20
Rank 20
April 2, 2023

Yes, the radiator temp should be just warm enough to match the heat loss from the building, so the heat pump is ticking over all the time. 

Rank 2
April 3, 2023

thank you Julia. Ok so i have it on compensation mode since last night. The house is warm this morning and water at 49. Do i use the internal thermostats just to guide as to the temp in the house and if too high reduce the curve settings until the stats tell me what i want? I would like 20 downstairs and 18 updates and maybe lower during the summer months.

M.isterW
Rank 6
Rank 6
April 3, 2023

Adjust the curve settings. In weather compensation mode it should be ignoring the thermostats.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
Rank 2
April 3, 2023

OK I will adjust the curve settings until the house is comfortable warm?  If my understanding is correct, this  mode keep the house at the same temp all the time (summer & winter ?) Albeit will have to work much harder in the winter and minimal in summer? I have the curve  set to 40/-3c  and 30/12c, so if after a couple of days its too warm I move lower curve down to something like 40/-3 and 28/12 ? and keep going until i am happy? 

Then at end of month check the COP and see if this is efficient? 

Sorry for all the questions, its all new and so much to learn!  Oil was so much more straight forward🤣, but i am hoping this will be worth it in the end. 😎

M.isterW
Rank 6
Rank 6
April 3, 2023

Yes, you're correct. The idea of weather compensation is that it keeps the house at a constant temperature whatever the temperature outside.

 

You can adjust either end of the curve, or both, to get the right temperature all the time.

 

It's really annoying that the controls are so fiddly because most people won't adjust them for maximum efficiency. I think that's why Mitsubishi introduced auto adapt as it requires less adjustment. I'm considering a controller called Homely which learns how your house gains and loses heat then adjusts the heat pump flow temperature for maximum efficiency. It should be available for Ecodan heat pumps later this year.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊