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MikeFl
MikeFl
@mikefl
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Reputable Member
Joined: Apr 17, 2023
Last seen: Oct 16, 2025
Profile Activity
Topics: 1 / Replies: 118
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RE: Is the Grant controller a thermostat?

@mab My defrost cycles are still on-going, and have been for the last 66 hours solidly, apart from that hour when the HW heating happens, when LWT sho...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@roamingbull Until yesterday evening they were what I got from the installer (WC was off, so I'm surprised these differ from the default values): 21...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

I'm in a village in Cumbria, on the edge of the Lake District. Yesterday was one of those still days, with freezing fog hanging low to the ground; tod...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@mike-patrick I couldn't agree more. It might be the case that, eventually, given lots of tweaking and work by the home owner, you get decent performa...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@mab Sadly, lower temps aren't helping me at all - entered the night at -7C and left at -2C. I tried dropping target LWT yesterday (the theory being...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@mab I've done some brief analysis of some minute-by-minute data and the defrost cycles seem to be around 40-45 minutes apart, possibly triggered by t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Icy cold weather, weather compensation and consumption

@iancalderbank Yes, that's something I'll be looking at. But I'm trying to hold off changing any WC parameters until I've sorted out the flow rates / ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona 13KW - can I boost it?

Ditto here. I can just about keep the house at 19C, but the pain of getting a 1C increase from an overnight setback takes at least 3 hours of daytime,...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona 3 Help programing

Yes, that certainly isn't wired as Grant want it to be. Zones 1 and 2 are wired together (which isn't that unusual, if somebody wants both zones to op...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@mab I must admit, I've never looked at the state of the fins. Too bl**dy cold to be outside. I'm just assuming all is working okay. I would have thou...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@mab As far as I can see, (at least for the Grant) there's no 'user control' of the defrost cycles (maybe wisely). The 'defrost temperature' is poorly...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

@ghayne @allyfish I think I agree; the OAT seems fairly resilient to what the HP is actually doing (I get a bigger influence from sunshine with HP on ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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