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ASHP Cut-off Temperatures: What's Your Setting and is a Your Heating Still On?

 
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Air Source Heat Pumps (ASHPs)
Last Post by TechnoGeek 8 months ago
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Mars
 Mars
(@editor)
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Joined: 4 years ago
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Topic starter 16/04/2024 4:15 pm  

I recently came across an interesting piece of information regarding air source heat pumps where the "accepted" ambient outdoor temperature at which ASHPs are designed to automatically turn off is 18C. Does anyone have this automated – ours isn't automated. If it is automated, at what ambient temperature does your ASHP shut down?

This topic was modified 1 year ago by Mars

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 Vince31
(@vince31)
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17/04/2024 10:05 am  

Not seen a setting on our ASHP for auto cut-off temp. I normally turn it off manually for heating (not DHW) at the start of May and back on again at end of Sept, but as its manual then I can be flexible either way.  Since install in 2015 ours has been set to maintain a constant 21C 24/7 from Oct to April and this works well.


   
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MikeFl
 MikeFl
(@mikefl)
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Posts: 122
19/04/2024 11:50 am  

My HP is set to "not supply any heat" above 19C external temp i.e. that's the top end of the WCC and above that it'll not run the pump. This isn't "off" though as the room stat might still be calling for heat, and so the internal pumps etc. will still be circulating water. Although at 19C outside I'd hope the house is warm enough.

I'm about to enter (hopefully!) summer #2 with it. I just left it running throughout the year (for CH and HW) - mostly it was doing nothing apart from the odd, chilly night, using <2 kWhs a day. 

Grant Aerona 3 10kW


   
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 Gary
(@gary)
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Posts: 343
19/04/2024 1:10 pm  

I don't have auto turn off either but manually change it over to cooling the UFH if its gets too hot in the summer


   
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TechnoGeek
 TechnoGeek
(@technogeek)
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Posts: 114
19/04/2024 2:53 pm  

The Samsung controller does not have an automatic cutoff and I have set mine to 16C. The heating is still on and I just leave it to do its thing and let the smart thermostat make the decisions 🙂

5 Bedroom House in Cambridgeshire, double glazing, 300mm loft insulation and cavity wall insulation
Design temperature 21C @ OAT -2C = 10.2Kw heat loss
Bivalent system containing:
12Kw Samsung High Temperature Quiet (Gen 6) heat pump
26Kw Grant Blue Flame Oil Boiler
All controlled with Honeywell Home smart thermostat


   
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 LeChillou
(@lechillou)
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Joined: 1 year ago
Posts: 1
19/04/2024 5:13 pm  

@technogeek Yes it does. It's in the field settings


   
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Mars
 Mars
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Posts: 3173
Topic starter 04/05/2024 9:35 pm  

It’s a bit nuts. May 4th today, and our central heating is still coming on in the evenings. Crazy. Whose heating is still coming on?

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Morgan
 Morgan
(@morgan)
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Joined: 4 years ago
Posts: 606
05/05/2024 7:12 am  

Mine is still coming on.

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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TechnoGeek
 TechnoGeek
(@technogeek)
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Posts: 114
05/05/2024 8:58 am  

@lechillou maybe I am misunderstanding, I thought the thread was referring to a designed in cutoff of 18C that cannot be adjusted. The field setting you refer to is indeed what I am setting to 16C which I have recently turn down to 15C. 😀

5 Bedroom House in Cambridgeshire, double glazing, 300mm loft insulation and cavity wall insulation
Design temperature 21C @ OAT -2C = 10.2Kw heat loss
Bivalent system containing:
12Kw Samsung High Temperature Quiet (Gen 6) heat pump
26Kw Grant Blue Flame Oil Boiler
All controlled with Honeywell Home smart thermostat


   
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TechnoGeek
 TechnoGeek
(@technogeek)
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Joined: 2 years ago
Posts: 114
05/05/2024 9:10 am  

@editor ours occasionally comes on in the morning if its been a cold night, 6 - 7C recently. The sun warms the house sufficiently during the day which the heat seems to last until bedtime most evenings thankfully 😀

This post was modified 1 year ago by TechnoGeek

5 Bedroom House in Cambridgeshire, double glazing, 300mm loft insulation and cavity wall insulation
Design temperature 21C @ OAT -2C = 10.2Kw heat loss
Bivalent system containing:
12Kw Samsung High Temperature Quiet (Gen 6) heat pump
26Kw Grant Blue Flame Oil Boiler
All controlled with Honeywell Home smart thermostat


   
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1
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Abernyte
 Abernyte
(@abernyte)
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Posts: 225
05/05/2024 9:50 am  

Similarly, internal stat is set to 17C and occasionally fires up briefly in the morning. Solar thermal is now doing the DHW, tank 60C + most days. Solar gain, should we be that lucky, raises the house temp. 


   
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Toodles
 Toodles
(@toodles)
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Joined: 3 years ago
Posts: 1919
05/05/2024 9:50 am  

@technogeek Our Homely controller turns the heating on for perhaps an hour sometime between midnight and six in the morning, today (wall to wall sunshine at the moment) I would imagine it will be getting some zeds in until perhaps 20:30 or so, then stay on for two - three hours, just topping up heating occasionally. Regards, Toodles.

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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