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MikeFl
MikeFl
@mikefl
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Joined: Apr 17, 2023
Last seen: Dec 6, 2025
Profile Activity
Topics: 1 / Replies: 124
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Those valves you show are either open or closed - there's no 'partially open' option. They should be in the 'auto' position (far right) but they have ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

I've noticed three types of Defrost Cycle (or at least their impacts on performance) which are all nicely shown in today's data. Overnight it was...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

Last Sunday, it was average -1.3C and very damp, so was in "defrost hell" which is every 40ish mins for a Grant: yesterday, it was +1.3C and dry, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona circulation/system pump staying on

There's also a parameter (41 22 I think) which controls how long the system pump runs after the compressor is off. I don't think this can run to hours...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP flow through pipes is noisy and preventing us from using at night......looking for help.

@dannymoss23 Yes - Constant Curve is Constant Speed (constant speed is a poor name, but you can see why it is that). Proportional Pressure is NOT reco...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP flow through pipes is noisy and preventing us from using at night......looking for help.

Hi - two things I've found reduced the 'flow noise' I was getting, might help you too: 1. Check for trapped air in your system i.e. bleed rads, and ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona circulation/system pump staying on

43 13 = "Backup heater set point during Frost protection" which I guess means that if you have a backup heater, that's when it will start to help with...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona circulation/system pump staying on

I'm close enough to the pump to hear it running, but the compressor isn't on, just the pump. And it ties in with the outdoor temp being between 3C and...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona circulation/system pump staying on

I've just checked on my controller and Frost Protection symbol isn't on, even though Frost Protection is running. The explanation of all of the symbol...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona circulation/system pump staying on

This is part of the Grant's 'frost protection' system (as opposed to the 'defrost cycle' which we're all familiar with in this type of weather!), whic...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Season’s Greetings

Same to you. Thanks for providing this forum for people to learn from and to teach each other. Here's to a higher COP and a lower energy bill in 2024!

2 years ago
Forum
Well & Truly Off The Grid
Reply
RE: Is the Grant controller a thermostat?

@heat_help Hi. You seem to be saying "flow rate" at some points and "flow temperature" at others? As you probably know, the flow rate on a Grant is fi...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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