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14Kw Mitsubishi Ecodan ASHP

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(@justinsb)
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@derek-m

Interesting... It's a "live" setting screen, as in you don't need to click the OK arrow to set it, you just have to change things & use the Return button to leave.

Also, it wouldn't let me go any lower than 20C...

Back out to the normal home screen, which is now completely blank, the press the big power button & you're back in business.

PXL 20211108 140605468

   
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(@derek-m)
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Posted by: @justinsb

@derek-m

Interesting... It's a "live" setting screen, as in you don't need to click the OK arrow to set it, you just have to change things & use the Return button to leave.

Also, it wouldn't let me go any lower than 20C...

Back out to the normal home screen, which is now completely blank, the press the big power button & you're back in business.

PXL 20211108 140605468

You cannot set the minimum flow temp. below 20C or above 45C, these are the operational limits. The maximum flow temp. can be adjusted between 35C and 60C.


   
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(@markc)
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@justinsb

Just out of interest, on the screen where you can preview or adjust your curve,

5

if you press the preview button F3 what curve settings does it show? Are these the same setting you have set up in your adjusted curve F4?


   
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(@derek-m)
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Justin,

On your present weather compensation curve the water flow temperature should be 30C when the ambient air temperature is 12C. You can calculate the expected water flow temperature as detailed below.

At an ambient air temperature of 20C, the requested water flow temperature should also be 20C.

For each 1C that the ambient air temperature falls below 20C, the requested water flow temperature should be increased by 1.25C.

Therefore at an ambient air temperature of 15C, the reuested water flow temperature should be:-

20 - 15 = 5 x 1.25 = 6.25 + 20 = 26.25C


   
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(@derek-m)
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Justin,

As final proof that weather compensation is doing its job, it would be useful to monitor if your ASHP is now running continuously, but at low speed and quietly. Also check to see if your central heating pump (if you have one fitted) is also operating.

What are the indoor temperatures at the moment? How warm does your radiators feel?


   
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(@justinsb)
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Radiators occasionally feel warm, mostly cool though. ASHP currently seems to be pulling a couple of hundred Watts, according to my Smart Meter remote monitor, which sits on my desk. House lovely & warm, currently the Temperature outside is 9.5 (according to my garden thermometer).


   
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(@markc)
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Posted by: @markc

@justinsb

Just out of interest, on the screen where you can preview or adjust your curve,

5

if you press the preview button F3 what curve settings does it show? Are these the same setting you have set up in your adjusted curve F4?

Apparently the curve preview button does display the correct settings.

50ºc @ -5 and 20ºC @ 20ºC looks like this

7

   
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(@derek-m)
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Posted by: @justinsb

Radiators occasionally feel warm, mostly cool though. ASHP currently seems to be pulling a couple of hundred Watts, according to my Smart Meter remote monitor, which sits on my desk. House lovely & warm, currently the Temperature outside is 9.5 (according to my garden thermometer).

When did you last have your garden thermometer calibrated?

Joking apart, it would appear that your system is working well. The fact that your heat pump is only drawing 200 Watts would indicate that the compressor and fan are not running. Just like a car engine has a minimum operating speed, so does an ASHP. When the heat pump is requested to operate below its minimum output, it will stop the compressor and fan until the loading increases again.

What is the actual temperature displayed by your thermostat.

Thank you for your help, it has been invaluable. It is difficult trying to figure out the required button pressing sequence when one does not actually have 'hands on' contact.

I would suggest that you continue to monitor the various parameters, and feedback the operational data and your findings, so that others on the forum may benefit from your experience.


   
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(@derek-m)
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Justin,

As you gather more operational data on your system at different ambient air temperatures, you will probably notice that the indoor air  temperature varies from the desired temperature. If you record these variations along with ambient air temperature, it should be possible to calculate the required changes that need to be made to your weather compensation to optimise the temperature control. Also note sunshine, wind speed and rain, which can also affect heat loss and hence accurate control.

With this information you should then be in a position to decide whether you need to install the wireless remote controller or stick solely with weather compensation.


   
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(@derek-m)
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Good morning Justin,

How is your system performing today?


   
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(@justinsb)
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Morning @derek-m, I'm all nice & toasty warm!

The house is all warm except for one room. All things considered, the kitchen seems to have an undersized radiator (100 x 70 K2 Stelrad), so I'm going to have a word with the installers about it (or, TBH, their boss, who designed the system & told them which radiators to put where).

The Honeywell controller I left set to 21°C to match the settings on the FTC. I haven't touched the curve at all. It all seems to have settled nicely, & for the past couple of days my whole house electricity consumption has been almost exactly 38Kwh - prior to the install my house used 13Kwh per day in Winter, so it looks like my 14Kw Ecodan is using around 25Kwh per day to run my 14 Stelrad radiators & hot water system.

ps. I really appreciate all the help that you have given on this. I'd still be cold & expensive without all of this guidance


   
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(@justinsb)
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Topic starter  

@derek-m On a slightly different note, my DHW is apparently set to only do things on a 10°C drop. If I dropped this down to 5°C would it make life more expensive, or just improve the responsiveness  - or is it a case of suck it & see by changing it, & monitoring what it does & if there is an impact on the electricity consumption.

A Question for everyone else: has anyone played around with the "Quiet" settings on an Ecodan?


   
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