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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RV3

(@rv3)

Estimable Member Member

Joined: 4 years ago

Posts: 40

24/04/2022 7:50 am

no - not the legionella cycle and yesterday it was back to the previous pattern - dhw being heated to over 60*C without any input from the heat pump. Further digging required might try to give mitsubishi a ring...

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Sliderule

(@sliderule)

Trusted Member Member

Joined: 2 years ago

Posts: 32

22/11/2023 2:07 pm

Thank you Justinsb, I am now running Advanced Auto Adaptation and am very impressed. It's using low power and no cycling. I extended the cable to the little FTC box and moved it into the living room temporarily. I removed the signal wires from IN1 and switched SW2-1 to off. With SW5-2 On, selecting Room Temperature mode gives Advanced Auto Adaptation. The only con is that as there is now no connection from the existing house thermostats to the FTC, I have to keep the living room thermostat set the same as the FTC thermostat so they switch off at the same time when the room temperature target is reached, otherwise the UFH pump will run unnecessarily, although it doesn't use a lot of power. I now intend to order a Mitsubishi wireless controller and receiver. (£167).

Any comments?

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