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Crimson
@crimson
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Joined: Jan 16, 2024
Last seen: Nov 25, 2025
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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 it’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
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant 13kW Aerona3 - issues getting zones to temp

thanks Derek. I’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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