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Crimson
@crimson
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Joined: Jan 16, 2024
Last seen: Jan 28, 2026
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Topics: 4 / Replies: 300
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RE: Grant 13kW Aerona3 - issues getting zones to temp

Hi @iancalderbank , Swapped over probes looked like a similar diff initially, but now since running speed 3 on secondary pump these temps seem to ha...

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

Other photos seem to show a size diff that would indicate 28mm main or more, then 22mm, then 15mm copper at the end. The 22mm branches seem to be for...

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

Thanks @iancalderbank - waiting for the plumber to confirm the sizing as that was just the builder's guess

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

@iancalderbank - builder believes it's a standard 22mm flow and return into a 15mm drop for the rads. But is confirming with the plumbers

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

So all in all I see: Top right of LLH versus pipe in plant room leading to heating zone: 1C drop Total drops with drop from zone pipe to r...

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

Thanks Ian, I'll ask this with the plumbers. I think upstairs looks to be running of this also, as I know that's approx where a rad is above this ro...

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

Hi Toodles, don't think any outside. The plant room is all lagged. And the ASHP has a pretty heavy duty underground insulated set (I think further b...

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

From photos I have of when the project was in progress looks like the pipe work is in the ceilings, plastic, then runs down the walls are metal. Thos...

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

Thanks Toodles.Here's probably a stupid question. I notice: (Grant panel) LWT on Grant panel (I think this never shows .5C rounded to nearest 1)...

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

Thanks Toodles, I hope so for sure. That 1.5C max uplift to LWT puts about 1C extra into the system at current temps, and really felt that upstairs. ...

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

I think itā€™s safe to say the rads downstairs appear to be the issue. Keeping upstairs on but reducing lock shields down does seem to have reduced cy...

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

thanks Derek. Iā€™ll try and push for the LLH to volumiser as well as simplification of zones. The DHW cycle heating upstairs was an oversight of the he...

2 years ago
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Air Source Heat Pumps (ASHPs)
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