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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Jan 14, 2026
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Topics: 20 / Replies: 3933
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RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

@mairia Whist we wait for it to get cold, if you would like to post the exact model number of your heat pump and whether it is R32 or R290, I will tr...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

Well spotted. However if there isnt a secondary water pump, which OP seems to believe there is not, there can be no buffer - or at least not one of t...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

OK that shows its working as programmed so nothing broken or misconfigured. Of course 'correct' is an interesting term which can mean either 'corre...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

Thanks for the additional info I wouldnt worry about a couple of degrees. If DHW is heating you would expect LWT to be higher than normal which ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Daikin Wireless Thermostat

If you do go for pure WC you may need to adjust the WC curve down (which will anyway improve efficiency) and possibly balance emitters. Feel free to ...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

The literature online does indeed suggest a 20l buffer tank 'which can also be used for hydraulic separation'. This suggests that Daikin are not sayi...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Daikin Wireless Thermostat

I wouldn't replace with a wireless third party thermostat, thrid party controls and heat pumps are generally best not mixed. If you do contemplate th...

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

Sorry mea culpa, I misread. That said you could correct for unstable IAT if you have a record of it. I agree, but if you dont have access to re...

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

I think this can be dealt with without the need for OAT to be stable (which rarely happens). You can either use average OAT over a reasonable period ...

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

I think you stand a good chance of this happening, other than the never talking about heating again bit, once the interest takes hold its very diffic...

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

In my cynical opinion the customer having faith is not the purpose of the survey. The purpose is to protect the installer by following a process set ...

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

How would that explain the temp difference across the LLH which you measure? More likely the air is in his head!

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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