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iraknic
@iraknic
Member
Trusted Member
197 kWhs
Joined: Dec 29, 2024
Last seen: Feb 9, 2025
Profile Activity
Topics: 2 / Replies: 22
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RE: Hitachi Yutaki M efficient operation

@jamespa there is indeed a large noisy water pump placed after the buffer tank that circulates the water through the ufh and the fan coils. However fl...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@jamespa i will try to have a reading as near to the hp as possible. So its possible that hot water enters the tank and is mixed with colder water tha...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

Another thing i noticed is the flow temp at the manifolds. While the heatpump shows a reading of lets say 35 out and 32 in, the temp reading at the ma...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@Jamespa There is a "minimum off" and "minimum on" setting. What do you think i should set the values at?

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

There is a "nightshift" mode with which you can set the hp to operate at reduced fixed capacity (lowest setting is 40%) for a period. If i set it to w...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@jamespa i'm using an app named hi-kumo, which has no monitoring tools, only basic settings. There is an updated controller, released recently by Hita...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@jamespa i was able to watch a 20 minute operation. In a 12c outside temp, the heat pump cycled off 2 times for 3 minutes at a time. When it cycled on...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@jamespa only able to measure delta t on primary circuit. If anyone with knowledge on hitachi heatpumps can suggest a way to see number of cycles, it ...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

@judith i can't hear the heatpump but i can hear the external waterpump. Maybe i can try increasing the flow temp, reducing the flow rate manually thr...

2 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

House is a construction of 2020 with xps insulation and double glazed windows. No clue on sizing. It was decided by the engineers during construction ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki M efficient operation

Hey JamesPa thanks for the reply. The reason for my post is my observation of the low dt and my concerns on the stress that the system undergoes. I ha...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Hitachi Yutaki M efficient operation
2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 31
Views: 1039
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