I'm looking at trying to optimise my ASHP but the settings I have I’m not entirely sure are the best for it.
I have a Ecodan ASHP, I’m currently using a temperature compensation curve to manage the heating, I have managed to get it adjusted so it now holds a constant 21 degrees, so I have the thermostats cranked to 25 degrees and let the curve manage the temperature, is this the correct idea?
The currents settings are:
12 degrees outside gives outflow temp of 21 degrees
-2 degrees outside gives an outflow temp of 35 degrees
After some reading it seems these temps maybe a little low? It’s a very efficient house with EPC rating of B and seems to retain the heat in very well.
I’m also wondering during the warmer months what will happen when the outside temp is higher than the outflow temp?
The ASHP currently cycles around once per hour, is it better to cycle as fewer times as possible?
Also any ideas why the outflow temp is lower than the return temp sometimes?
Welcome to the forum@patch and well done for your understanding so far! You’ve made a great start. Once an hour is a very acceptable rate of cycling and when you’re longer than (guess) 40mins there’s no more to be gained. With present external temperatures all of our ASHPs will cycle. I can’t answer for your Mitsubishi but others will help there. They all have some way of going to sleep after a particular temperature is reached, usually that can be set to suit your house and family.
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
I've nothing to add over what @judith and @morgan have already posted but I'm interested what you're using to produce that screenshot; it certainly isn't Melcloud or Home Assistant.
105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs
"Semper in excretia; sumus solum profundum variat"
Odd F and R readings this is very likely due to the flow rate you are running it at, its very close to the frost protection os 20Deg C
The Ecodan will run nicely at 25 flow rate
The minimum flow temperature for Mitsubishi Ecodan air source heat pumps varies depending on the model and system configuration.
General Minimum Flow Temperatures
Standard Ecodan Models: The minimum flow temperature that allows heat pump operation is typically 20°C. Operating below this temperature may prohibit the heat pump from functioning. ManualsLib
Ecodan R290 5kW Monobloc: This model can achieve flow temperatures up to 75°C, but the minimum flow temperature is not explicitly stated. ecoenergyvision.co.uk
Freeze Protection
The Ecodan system includes a freeze protection function that activates when the flow temperature drops to 20°C and the outdoor ambient temperature falls below a certain threshold. This function helps prevent the water circuit from freezing. ManualsLib
Practical Considerations
While the system may technically operate at these minimum temperatures, it's essential to consider the heating requirements of your property. Operating at lower flow temperatures may not provide sufficient heating during colder periods.
For optimal performance and to ensure your system meets your heating needs, it's advisable to consult the specific technical documentation for your Ecodan model or contact a certified installer.
105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs
"Semper in excretia; sumus solum profundum variat"
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