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MikeFl
MikeFl
@mikefl
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Joined: Apr 17, 2023
Last seen: Dec 21, 2025
Profile Activity
Topics: 1 / Replies: 126
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RE: Defrost Cycles - How Common Are They?

@rupes This is very interesting. I'm trying to wire up my LLH heater atm, but it's a tricky cabling path for both power, and the control switch from t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant 10kW versus Samsung 12kW - sizing dilemma with ECO4 installation

Just to clarify @allyfish comments to avoid confusion (I hope) - they were talking about the need for an automatic setback function at nighttime which...

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

@rupes Here's my pattern for yesterday. Although I was in constant defrost cycles, I was hitting target quite often, but the house temp was a good 1C ...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

@allyfish I think this slow handover between DHW and CH (and even this isn't the Grant way as per installation) is because LWT on the DHW cycle (say 6...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

HW would be better run during the afternoon (say 3-4pm) rather than overnight, as it's when the LWT is highest so you want the warmest external air yo...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

@allyfish Thanks for the info. For whatever reason, I didn't get the standard Grant HW cylinder with my install (it's a ukcylinders slim one) and they...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

- that is the immersion heater element, so that's the right thing to do. There should now be nothing which is trying to add heat to the HW cylinder. ...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

You've possibly had a pressure issue, which could be the hissing sound, or maybe there's been a slow leak on the secondary return valve that's now got...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

For adjusting the overall system I'd leave everything open - you want to adjust things for when there's full demand on the system. Use TRVs to reduce ...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

It depends a little on what the current OAT is. You're basically lowing the WC line to generate less heat, so you could lower either end, or both ends...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona3 10kw - Few questions

Hi, welcome to the forum! To answer your questions in order: "having WC on overrides the thermostat settings is this correct? I've changed the the...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Primary flow rate is good. Now it's time to sit back and stop thinking about deltaT, low loss headers, thermal mass, heating zones, ... have a break, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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