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SUNandAIR
SUNandAIR
@sunandair
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Joined: Dec 30, 2022
Last seen: Jul 9, 2025
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Topics: 5 / Replies: 495
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RE: Low Loss Header is losing 1.5c from flow temperature

yes. Quote right, accuracy and 1c increments could lead to a skewed interpretation especially when we are only looking at 1or 2c variations. ive tri...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Thanks for your comments Ian, it’s very much appreciated. Half the battle has been understanding and using the correct terms and acronyms, and realis...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

not sure of the “where” bit of your question - the DT I mean is the temperature differential between Primary Flow and Primary Return. These temperatur...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Hi @derek-m The temperature difference of 1.5c is between Primary flow thermistor and Secondary flow thermistor. See sketch for positions and approx d...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

@derek-m hi sorry I’ve spent one hour writing a reply to you and when I sent it it was lost without a trace. I can’t face re writing it again

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Early test results showing opposite is happening in our system. I’ve opened up the primary pump valve until flow rate went up to 15 LPM (was 13) an...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Low Loss Header is losing 1.5c from flow temperature

Thanks @derek-m I will check the pump speeds. I recall the primary pump was adjusted to flow at 12 LPM but the secondary pump was left operating sligh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Low Loss Header is losing 1.5c from flow temperature
2 years ago
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Air Source Heat Pumps (ASHPs)
Replies: 41
Views: 7852
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RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

@william1066 yes there’s are three sensors in total but only 2 are needed to activate the pump for the solar circuit. one is mounted in the roof top...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

Another way I thought of checking efficiency was how long the DHW reheat took. Since there are less chances of cycling etc. So I set up a forced DHW...

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

@cathoderay great points and perfect timing. 👍

2 years ago
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Air Source Heat Pumps (ASHPs)
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RE: Keystone COPs? I'm not getting the efficiencies I expected on my Ecodan.

As @cathoderay says, there’s a lot of mixed feelings about the risks especially in an unvented system with high useage. It’s fascinating how how even ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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