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trebor12345
trebor12345
@trebor12345
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Joined: Feb 26, 2024
Last seen: May 14, 2025
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Topics: 4 / Replies: 31
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Thank you this is very helpful. There is a lot to take in. I have the heating on today and have been doing videos of the Live View. The funny thin...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

File received thank you.

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

I have tried the DT mode and it does seem to be better with this setting. The Gundfros UPM3 is current in constant pressure setting 3 (max). When t...

4 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

UFH is mainly 200mm. Screed - 17mm Ambi Tak. Mainly engineered wood and carpet and tiles.Grundfos UPM3 (K) in constant pressure mode. Switched on b...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

It has taken me a while to get my head around it, plus the warmer temperatures to prove it. I have tried to explain the situation to Hitachi, but they...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Thank you all for your help, this has been a learning experience. So in summary. My heat pump is oversized, this causes Thermal Off’s or short cycle...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

I am drawing the same conclusion that this system for some reason switches off for 3 minutes then 8 minutes latter does it's de-ice cycle. It does th...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

8 room thermostats are all in Frost Protection mode. The one in the family room controls the heating. All the manifold actuators have been removed. ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Your calculation of 13W per sqm fits well with what I found at 14W. So if I require 14W/m2 and the floor area is 179m. 179x14 = 2505. Does that m...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

From the Full SAP Report: Space heating requirements: 8314 Kwh/year I can see the U values for all of the structure, but don’t understand the fina...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

I done some checking with chatgpt and yes its 7 KW output with an input of approx 2KW, thank you for correcting this. So at 20W/m2 and 200sq/m that'...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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