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Ecodan Auto Adapt Questions

 
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Air Source Heat Pumps (ASHPs)
Last Post by SUNandAIR 1 year ago
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JamesPa
 JamesPa
(@jamespa)
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18/03/2025 5:55 pm  

Posted by: @richard24738
↑

James: Just noticed the timing of the drop: from 21 c at 16:05 to 10c at 16:45.

Useful.  When did it go into shade?  If not then, what else was happening at the same time?

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Richard24738
(@richard24738)
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Topic starter 18/03/2025 7:03 pm  

@jamespa Sorry not exactly sure about when it went into shade but my feeling is at the same time as the temp drop.

Clutching at straws:

 - I did have a Tesco delivery at 16:05 so the front door to the house was open for a while but I can't see how that would influence the outdoor temp.

 - my heating timing has a room temp increase from 21c to 22c at 16:00

If it's sunny tomorrow, I'll keep an eye on the temp and if it spikes I'll try to add some shade.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
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 Boycey
(@boycey)
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Joined: 1 year ago
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19/03/2025 8:34 am  

@richard24738 if the sun's out, aren't you getting solar gain in the house?. We have the same thing, our HP is on the south side so get sun directly on it, but although it's only a couple of degrees outside we get warmed up a lot for free from the sun. The next day it may be cloudy and so not affect the HP. So it's not really an actual problem for us. Do you find the same? Or am I missing the point?



   
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JamesPa
 JamesPa
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19/03/2025 8:56 am  

I think the point is that the sun can be out, but it can still be very cold, so you still need some heating.  @richard24738 seems to have a problem that, when the sun is out (?), his outdoor sensor which controls the weather compensation reads 20 degress plus, so the ASHP stops heating altogether.  It seems likely that its because its in the sun (it should be in the shade), but this is yet to be proved.


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Richard24738
(@richard24738)
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Topic starter 19/03/2025 9:11 am  

@boycey Heat pump is located at the back of the house and yes I agree, yesterday the sun was out and the rooms at the back of the house had some solar gain. 

Mitsubishi were concerned that the outdoor temperature reading would adversly affect the Auto Adapt calculations.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
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 Richard24738
(@richard24738)
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Joined: 2 years ago
Posts: 102
Topic starter 19/03/2025 9:19 am  

@jamespa Many thanks for comment.

I can't recollect any location instructions from Mitsubishi stating that the unit should be in the shade, only physical positioning. Maybe it's an unwritten rule.

I believe other heat pump manufacturers allow the relocation of the outdoor thermostat sensor.


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4714
19/03/2025 9:30 am  

Posted by: @richard24738
↑

I can't recollect any location instructions from Mitsubishi stating that the unit should be in the shade, only physical positioning. Maybe it's an unwritten rule.

 

Thats bizarre.  It definitely needs to be in the shade!  There is a reason small weather stations are inside Stephenson's screens!

Posted by: @richard24738
↑

I believe other heat pump manufacturers allow the relocation of the outdoor thermostat sensor.

Vaillants are wireless so they cant really tell.  Not sure about Mitsubishi but it obviously needs to be relocated if its in the sun.  Suggest you perform the experiment to prove (or disprove) that this is the cause.  Temperature sensors are pretty reliable, so its definitely the most likely.


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Richard24738
(@richard24738)
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Posts: 102
Topic starter 19/03/2025 9:58 am  

@jamespa The mitsubishi outdoor thermostat is attached to the protection frame at the back of the heat pump and connects via a short red cable. There doesn't appear to be any flexibility in positioning.

When the original thermostat was replaced, the engineer positioned it in the same place..

It looks like today is going to be sunny again so will watch things more closely.

 


Install 13 April 2024 - 4 Bedroom Brick Detached - Heat Loss 9,281w, Design 45c at -2 - Ecodan 11.2kw R32 - 25L Buffer - 250L Telford Tempest HP DHW - All 16 radiators replaced - Auto Adapt - Mel-Pump app - Octopus Cosy Fixed
10 March 2026 - now 2 x Sigenstor 10 batteries with 8kw Inverter


   
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 davidnolan22
(@davidnolan22)
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Joined: 1 year ago
Posts: 136
19/03/2025 10:04 am  

@richard24738 yes, the R32 its attached to the frame, on the new R290, then can be places away from the unit. This make the weather comp much worse on the R32 units



   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4714
19/03/2025 10:05 am  

Posted by: @richard24738
↑

@jamespa The mitsubishi outdoor thermostat is attached to the protection frame at the back of the heat pump and connects via a short red cable. There doesn't appear to be any flexibility in positioning.

Thats a bit of a design flaw.  Maybe a strategically placed sunshade is required!


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Boycey
(@boycey)
Trusted Member Member
Joined: 1 year ago
Posts: 47
19/03/2025 10:07 am  

@richard24738 have you popped the cover of to see if there's any length tucked inside, if you (we) could position it nearer the bottom of HP I would think that could make a fair difference.  Mines on the top right rear corner, looking from the front.



   
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JamesPa
 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 4714
19/03/2025 10:40 am  

Posted by: @boycey
↑

@richard24738 have you popped the cover of to see if there's any length tucked inside, if you (we) could position it nearer the bottom of HP I would think that could make a fair difference.  Mines on the top right rear corner, looking from the front.

Good idea.

If you can move it, try to avoid placing it somewhere it gets affected by whether the unit is on or off. 

Midea heat pumps (or at least the Midea heat pump owned by @cathoderay) have an air intake sensor which doubles as the outdoor temperature sensor.  This appears to be pretty much OK when the heat pump is running, because its constantly drawing fresh air over the sensor, but when its not running the sensor gets warmed by the residual heat in the unit, thus distorting the readings.  In practice this probably doesn't matter much unless you are trying to work out whether setback costs money or saves money, which is how the issue came to light.

Temperature sensors are often fairly high resistance thermistors and so can be extended with any ordinary two core cable.  My installer did that for my DHW tank sensor.  It probably invalidates the warranty though!

 

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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