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

Has the flow rate now increased if you look at the regulator below the pipe where the mag one sits? Balancing the flows across the LLH is something ...

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

Isha killed my internet so out of loop a bit on this one, but has the auto bypass valve been checked? It should be set to almost never operate as your...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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