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14Kw Mitsubishi Ecodan ASHP

RE: 14Kw Mitsubishi Ecodan ASHP

Justin · 2021-11-06T21:30:06Z

Hi 🙂 We bought our house in June & are still getting ourselves properly organised. The house was built circa 2000, & met all the required standards & insulation specs of the time. It's fully double glazed & appears to hold its heat well, so it looks like the insulation does what it's supposed to. Last week we had a 14Kw Mitsubishi Ecodan ASHP installed feeding a genuine Mitsubishi 300l cylinder. We went with Stelrad K2 & K3 radiators throughout. That system went live a couple of days ago. Our old radiator system had bits of microbore, which the ASHP installers removed, so we now have the original 28mm flow & return pipe system with 15mm pipes running out to each radiator (I watched them do each one, so it is all as it was supposed to be). The guys are coming back this Thursday to fit our PV system. It is going to be twelve JA Solar 320W Mono panels with SolarEdge P505 Optimisers and a SolarEdge 3680W inverter. For some reason the ASHP system also has a Honeywell T3R thermostat connected to it, even though it also has the MelCloud WiFi module & the MelCloud app live & running at the same time. I'm currently working out how to efficiently configure my Ecodan, as it used 60Kwh of electricity on day 1 & 56Kwh on day 2. OK, the house had had no central heating during the installation period & was absolutely baltic when we finally fired everything up. Today, the temperature seems to have stabilised, it's now comfortably warm, & it looks like I'll have only used around 40Kwh. I'm going to keep on closely monitoring it by checking my Smart Meter morning & evening - I was supposed to have an EMP2 fitted on my Ecodan system, but it isn't there yet. TBH, I would prefer an EMP3 with the full MMSP payments on my RHI, but that's still under negotiation with my suppliers.

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Air Source Heat Pumps (ASHPs)

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Morgan

(@morgan)

Noble Member Member

Joined: 5 years ago

Posts: 698

08/11/2021 12:35 pm

@kev-m

I’ve just adjusted the curve as below so waiting to see if that has an effect first. If the ASHP is always on surely it’s just heating full time? That’s what appears to be happening here. Don’t want to hijack the thread from Justin.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

08/11/2021 12:36 pm

@justinsb

Good morning Justin,

That is an excellent COP for this time of year, their are some members on the forum who have been getting COP values of below 3.

I have just been on a Skype call with MarkC helping him set up his weather compensation and we were struggling to find the water flow temperature reading afterwards. Maybe you could help since you have obviously discovered the inner secrets of the controller.

With regard to control of your system, you could certainly replace the Honeywell thermostat with the Mitsubishi wireless remote controller. I am in the market for a new thermostat, so may be encouraged to take the Honeywell off your hands. For the time being, if the thermostat is still exerting control over the system then it would appear that the weather compensation still requires further optimisation.

I was reading further through the manual last night, (good bedtime reading) and noticed that there is a default setting of 30C as the minimum water flow temperature, which if still at this setting could possibly limit the operation of the weather compensation. Would it be possible to check this setting? The details are shown on page 38 of the manual under the heading .

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

08/11/2021 12:47 pm

@morgan

Change the higher ambient temperature setting from 36C water flow temperature @ 10C outside air temperature to 20C @ 20C. See if that makes any difference.

👍

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

08/11/2021 12:58 pm

Justin,

If you have time, could you please have a look at [Service menu] on page 38 and see what the default settings are on your system.

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Morgan

(@morgan)

Noble Member Member

Joined: 5 years ago

Posts: 698

08/11/2021 12:59 pm

@derek-m

Done.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

ReplyQuote

Justin

(@justinsb)

Estimable Member Member

Joined: 4 years ago

Posts: 100

Topic starter 08/11/2021 1:05 pm

I'm currently trying to find out how I did what I did, & how to see those figures... 🙂

I'll try & get my default settings in a couple of minutes too

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Justin

(@justinsb)

Estimable Member Member

Joined: 4 years ago

Posts: 100

Topic starter 08/11/2021 1:30 pm

@derek-m @morgan

I think this is what you are looking for, hopefully.

You have 3 buttons along the bottom left of the unit: Menu, Return (the round arrow) and OK (the tick)

Press the Return button to activate (light up) the screen

Press and Hold the menu button for around 5 seconds or so

A whole new screen appears, looking like this:

Use the two central buttons under the scroll arrows to scroll across to the Service icon (far right).

Press OK (the tick) to enter the Settings menu.

It asks for a Password/Pin Number but I left it at 0000 & it worked for me

Press OK (the tick) again to enter the Settings menu.

Scroll down, & down, & down. On the third screen full of options you should find Summary of Settings

Press OK (the tick) to see what it has to say.

When you have finished, press the Return button (the round arrow) to get back out.

Select Exit Settings when asked, the use the Return button to return to the normal Home Screen

Hopefully this is what you need...

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Morgan

(@morgan)

Noble Member Member

Joined: 5 years ago

Posts: 698

08/11/2021 1:32 pm

@justinsb

I can’t remember what I want to see ☹️

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

08/11/2021 1:38 pm

@justinsb

Justin,

Under the Summary of Settings does it show the minimum and maximum permitted water flow temperatures, and if so, what are they for your system? If fact, could you please provide a list of all the settings shown.

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