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MikeFl
MikeFl
@mikefl
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Reputable Member
Joined: Apr 17, 2023
Last seen: Dec 11, 2025
Profile Activity
Topics: 1 / Replies: 125
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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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RE: Is the Grant controller a thermostat?

@marvinator80 You can see the LWT (and Return WT) on the Controller. Slightly easier than getting to the other parameters, you press the 'return' key ...

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

The optimal figures will be different for each house, but those figures don't look wildly out. 21 01 is the fixed LWT (leaving water temperature); s...

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

@allyfish Ditto for my Grant 10kW - it gets closer to the target LWT after each iteration following the defrost cycle, but never seems to quite make i...

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

Grant couldn't make it any simpler(!) ... or not ... Go to the Controller, and open up the flap: Press 3 buttons at the same time: the one that lo...

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

So far as I understand it, pressing the up/down has no effect (other than to change the number being shown). In the installation guide: "Please note...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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