Ecodan Melcloud temperature control with compensation curve
Posted by: @morganOh @kev-m you star you 😘🤣
@dotty9943 I’m glad you’re on the up 👍
I was fed up of Derek getting all the plaudits, this is just the start for me!! 😆
Posted by: @dotty9943
d. Our radiators were rebalanced last week
Who re-balanced the radiators? Was it done using the lockshield valves? Do you have any TRV's fitted?
e. We have set weather compensation so that flow temperature is at the recommended level
What are the settings of the WC curve?
f. The heat loss study confirmed that our 14 kw is big enough to heat our. House and compensate for the heat loss
What are the heat loss calculations for your home? What type and size is your home?
My web researches don’t suggest any other explanation for poor efficiency so can any one come up with new ideas? Failing that I don’t know what to do short of taking our heat pump out and starting again with an efficient combi boiler
Low efficiency can be caused by incorrect WC settings, also using on - off type thermostats. Having a buffer tank, low loss header or plate heat exchanger can also have a detrimental affect. Do you have any of the above installed?
Posted by: @kev-mPosted by: @morganOh @kev-m you star you 😘🤣
@dotty9943 I’m glad you’re on the up 👍
I was fed up of Derek getting all the plaudits, this is just the start for me!! 😆
I am devastated. 😪
It would appear the 'peasant's are revolting', but then they always have been. Have you been 'eating cake' again? 😋
Posted by: @dotty9943@kev-m Now that you have solved the problem of temperature readings, this has enabled me to move on to the next stage of my attempts to find out why my heat pump is achieving such poor COP scores (They are about 2.3 when the predicted score is 3.2 and better. We have done the following without much progress
a. On the basis of the Ecodan recommendations following a heat loss study, we have up graded all our radiators
b. We have replaced doors and windows so that all our doors and windows are now double glazed
c. We have put new thicker insulation in our loft
c. We have put throttles in our chimneys
d. Our radiators were rebalanced last week
e. We have set weather compensation so that flow temperature is at the recommended level
f. The heat loss study confirmed that our 14 kw is big enough to heat our. House and compensate for the heat loss
G. The system was serviced in December, when the filters were cleaned.
My web researches don’t suggest any other explanation for poor efficiency so can any one come up with new ideas? Failing that I don’t know what to do short of taking our heat pump out and starting again with an efficient combi boiler
This is much harder now! A few questions:
Are you letting WC control room temperature or are you using thermostats; either Mitsubishi or 3rd party? Is the ASHP running all the time or is off/cooler some of the time
What sort of flow temps do you have at, say 0 and 5 degrees outside?
Are you including HW in your numbers? If so, how hot and do you use a lot?
Do you have different zones in the house that are on and off at different times, or do you use TRVs a lot?
Do you have a buffer or low loss header?
I have a 14kW Ecodan and my January COP for heating and HW is about 3.1 so far. 2.3 is a bit low but it depends how you are using it.
@derek-m thanks. The balancing was done by an accredited (by Ecodan) air source heating engineer. I am not sure what a lock shield valve is) but if it is fitted at one end of the radiator, yes. We have TRV valves. The WC curve settings are 45 c/30c
The heat loss calculation was 12KW, since when we have improved insulation
Our House is a 4 bedroom detached house on two storeys, built in about 1920. The floor area is about 240 sq metres, so quite big
- 22 Forums
- 2,037 Topics
- 44.4 K Posts
- 27 Online
- 3,250 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: Help with understanding my Mitsubishi Ecodan air source heat pump
Welcome to the forum, @patch. I've nothing to add ove...
By Majordennisbloodnok , 19 minutes ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk, in terms of ballpark pricing, if we assume a st...
By Mars , 3 hours ago
-
RE: Air Source Heat Pump - Side Alley Suitability
@jamespa I used an assumed indoor temperature of 18C. I...
By Ad3628 , 15 hours ago
-
RE: ASHP Ecodan L9 error - No Heating but Hot Water
That’s interesting, but obviously concerning also…. Do ...
By SUNandAIR , 16 hours ago
-
RE: In the middle of an ASHP installation - a few questions (and issues)
Thank you @robs - that very useful data. The issue wa...
By Transparent , 20 hours ago
-
RE: The Rise and Fall of Europe’s Most Generous Green Subsidy
@editor Attached images of external insulation. Think...
By Dwynwen , 1 day ago
-
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's
@trebor12345 The Auto function is supposed to adapt au...
By Heatgeek , 2 days ago
-
RE: The Great British Heat Pump Quiz
@allyfish thanks for the feedback and glad it was fun! ...
By Mars , 2 days ago
-
RE: help sizing rads based on room by room heat loss
If its 1988W at DT 50, which is how most radiators are ...
By JamesPa , 2 days ago
-
RE: Career change – entering the world of heating and heat pumps
@editor Mars, thank you. That's along the routes I was ...
By Lakey , 2 days ago
-
@editor thanks Mars, it's a rare occasion I'm looking f...
By big_si , 3 days ago
-
RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW
@ashp-bobba and @jamespa - thank you both for all your ...
By CBrenewable , 3 days ago
-
-
Win one of five "Heat Pumps 101" Courses
Heat pumps are gaining traction in the UK, but between ...
By Mars , 3 days ago
-
RE: Agile: average import cost vs other tariffs?
@toodles thanks for the analysis. I'll be really intere...
By Old_Scientist , 3 days ago
-
RE: Is this normal? Click of the DHW returning to space heating
@grantmethestrength Oh sorry to hear that, there should...
By ASHP-BOBBA , 4 days ago
-
@ashp-bobba TBH the ladies are rather disorganised, so ...
By Cathyem1 , 4 days ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
And for those of us without an automatic irrigation sys...
By Majordennisbloodnok , 4 days ago
-
Logically, the lower frequency = more gentle, yes, but ...
By SUNandAIR , 4 days ago