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Is the Grant controller a thermostat?

 
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Air Source Heat Pumps (ASHPs)
Last Post by Derek M 3 months ago
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 Marvinator80
(@marvinator80)
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1020 kWhs
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26/02/2024 9:40 am  

After the recent issue I had the last time it was really cold, I spoke to Grant and they got me to make some adjustments to the parameters over the phone. It’s been fine since then but last night was the first real test as such. It got down to -4.

woke to around 20 degrees downstairs underfloor and 19 upstairs radiators which is a definite improvement. 

previously it was dropping overnight in cold weather from 21 to 18. This was because of the defrost cycle.

i don’t have an LLH or a Volumiser. I asked Grant about this as I found in the instructions that seemingly these are classed by Grant as essential for all installations.

Grant were a bit evasive of that point, asked me to try what they had suggested for now. 

but riddle me this - should I really try to have everything calling for heat all the time in that kind of weather to maximise volume? Sometimes parts will reach temperature for a while and then click off? And the upstairs I have set back to 18 overnight rising to 21 from 6am.


   
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 Gary
(@gary)
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26/02/2024 10:17 am  

@marvinator80 I find that with my system UFH and rads I need all circuits open all the time calling for heat 24/7 any setbacks when its 0 or below only cause the house to cool too much and then can't recover.  This means your heatpump is appropriately sized and not oversized which is a good thing.

If I set back to 18C till 6am then asked it to get to 21C from 6 it would probably get to 21C around 6pm and will have been running flat out all day and will have consumed about 40kwh.  Where as leaving it on with no setback may use the same amount of electricity but the house will be continually warm which is much more pleasant.


   
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 Marvinator80
(@marvinator80)
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26/02/2024 11:24 am  

@gary that’s great Gary, thank you. I’ll set everything to 21.5 so it’s always pumping. Then when it hits 22 it’ll stop, which won’t happen in sub zero cold but will prob maintain 21, which is fine.

then when it’s above 5 degrees there is it will easily reach 21.5 then stop and probably maintain by itself for quite a while. 


   
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 Derek M
(@derek-m)
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26/02/2024 11:33 am  

Posted by: @marvinator80
↑

@gary that’s great Gary, thank you. I’ll set everything to 21.5 so it’s always pumping. Then when it hits 22 it’ll stop, which won’t happen in sub zero cold but will prob maintain 21, which is fine.

then when it’s above 5 degrees there is it will easily reach 21.5 then stop and probably maintain by itself for quite a while. 

If you prefer the temperature slightly cooler in the bedrooms you have the choice of adjusting the lockshield valves or using TRV's.

 


   
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