Is the controller in the hallway or in the cylinder cupboard?
and I’m asking for photos so I can map out the plumbing layout…. It saves me asking you ‘do you have a buffer, do you have a plate heat exchanger, do you have a llh, is your primary pump pwm controller’ etc…
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
Thanks Hugh- the cylinder is located in airing cupboard with the main controls and the thermostat is located in the hallway. The ASHP is on the side of the house with the flow and return pipes running up the side of the house in to the loft where the rest of the install is located. See pics. I hope that helps
How many cables go to this pump? It will either be one, or two.
With the ecodan controller located in the airing cupboard, your system is installed like a boiler, with the ecodan controller having no input on the flow temperature and the thermostat controlling the secondary pump.
Unless you have a Mitsubishi wireless thermostat in your hallway? What brand of thermostat do you have?
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
Ok, so the primary pump is not pwm controlled so the heat pump isn’t able to modulate it’s flow. Not the end of the world but certainly not the most efficient way of doing things.
Are you running the ecodan controller in auto adaption mode or standard weather compensation?
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
@hughf standard weather compensation. I am just on the phone to Mitsubishi technical now and sent them a screen shot of my usage chart through my solar app. They are slightly concerned and he has gone to speak to his colleague..... got me even more worried now! Will post an update shortly. (Usage chart attached for your perusal)
They said it's fine to cycle like that as its on the hour - he thought it was cycling a lot more. It was not until I zoomed in he confirmed that it is ok like that.
Cycling looks fine to me, not too short. It’s bubbling along at 6.5kW ish, all night. Heat loss is very good for something that’s 400 square meters. We’re at 6.7kW heat loss at -3/21 and we’re only at 100 square meters.
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
Given your house size, I'd personally whip out that low loss header as well. Cant see flow rates being an issue in 400m2 of floor space.
12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE
@hughf standard weather compensation. I am just on the phone to Mitsubishi technical now and sent them a screen shot of my usage chart through my solar app. They are slightly concerned and he has gone to speak to his colleague..... got me even more worried now! Will post an update shortly. (Usage chart attached for your perusal)
This is more likely to be defrosting. (The term cycling is usually used where the ASHP can't modulate down low enough where the load is low) My Ecodan energy looks very similar at the moment and it's definitely defrosting every 60-80 minutes as I can see it on my monitoring. All normal in these conditions. You can see the flow plummet and a tiny blip in the ambient (assmued because of where the sensor is).
Given your house size, I'd personally whip out that low loss header as well. Cant see flow rates being an issue in 400m2 of floor space.
Agreed, going direct would bring a benefit on efficiency. Can the ecodan drive a pwm primary pump? I haven’t checked the wiring diagrams .
Off grid on the isle of purbeck
2.4kW solar, 15kWh Seplos Mason, Outback power systems 3kW inverter/charger, solid fuel heating with air/air for shoulder months, 10 acres of heathland/woods.
My wife’s house: 1946 3 bed end of terrace in Somerset, ASHP with rads + UFH, triple glazed, retrofit IWI in troublesome rooms, small rear extension.
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