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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Jan 14, 2026
Profile Activity
Topics: 20 / Replies: 3933
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RE: Grant 13kW Aerona3 - issues getting zones to temp

So what have they done 'cos its got to be serious to get what you measure. Faulty secondary pump? Valve left closed? Fitted a bypass loop? The heat...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat Loss v Outside Air Temperature

Thats exactly how I sized my heat pump. Surveys (2 off, each taking 3 hrs, one of which I paid £300 for) said 16kW, measurements of gas consumption s...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is Your House Warmer Upstairs Than Downstairs?

I suspect its mainly that you get the views. Upstairs too warm is going to become something of a problem as insulation gets better, particularly giv...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is Your House Warmer Upstairs Than Downstairs?

Good, what Id expect, you may need to tweak the WC as the temperature cools down, but hopefully thats it As you obviously realise there is nothin...

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

You might not be able to, but your installer definitely could. If you swap flow and return either on the primary side or the secondary side then basi...

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

With that drop its clear that very little hot water is getting from the primary into the secondary so either pump problem or piping problem. Has he p...

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

Really sorry to hear this, I was expecting no change not a deterioration and I must therefore eat humble pie following my comment that swapping a smal...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me keep the faith with my air source heat pump installation

made of brass not plastic, proper square hole same shape as bleed screw. I did a quick search and they seem relatively rare, most seem to be a (pres...

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

Definitely. 8C DT is higher than the default design DT for most heat pump systems which is 5 This has the effect of reducing the average flow temp b...

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

Thats a great analysis and |I doubt any heat loss calculations adequately deal with this. Put another way there is an (probably) unaccounted for loss...

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

Thanks. I had forgotton that particular feature. I presume the call for heat switches secondary pumps on/off not the heat pump. All of this is goi...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Daikin Short Cycle Query

Its the heat pump, more specifically the compressor, cycling on/off quickly. The most important parameter is the on time, anything less than about 1...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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