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RobS
@robs
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Joined: Oct 15, 2024
Last seen: Sep 5, 2026
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Topics: 0 / Replies: 138
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RE: Setback savings - fact or fiction?

Good graphs @cathoderay but is the axis labelling wrong? X-axis (0-18) should be OAT and y-axis (0-10) COP? Interesting that the COP advantage of cont...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

@cathoderay yes I am familiar with SQL. Interesting numbers... If there was no setback we have 4.12 kWh and a mean COP of 5.21, so energy in of 0.791 ...

9 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @cathoderay - this is a good discussion! I feel like we might be making some good progress in answering the fundamental setback question.   ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

Hi @cathoderay The 13kWh is as they say my bad, I was calculating 3 hour periods for the reheat and mistakenly only multiplied by 3 here, so 13 ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

The predicted values are based on assumptions and it is these assumptions that need testing IMHO. Your 9-10 April graph shows that prior to your se...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Setback savings - fact or fiction?

I'm not James but here's some thoughts... Have you tried to control for solar gain? And what about controlling for wind chill effects (speed an...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thanks, if the water can drain out of the heat pump without any issues in sub-zero temperatures then that's one possible issue ruled out. But if th...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

@trebor12345, a few questions if you don't mind... Does the water come from drain holes in the bottom of the heat pump or is there a pipe to carry ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

It is usual for the flow temp to start to drop as a heat pump approaches a defrost, here's a 7kW Vaillant like yours doing the same (if less pronounce...

9 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Replacing my 18 month old ASHP

@trebor12345 @jamespa If it helps any this documentsays the Hitachi RAS-3WHVRP1 can modulate down to 2.1kW at 7C OAT and 35C flow temp. So another ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Effect of Mitsu PAR WT60 Wireless Controller

Hi David, If your Mitsi is still on weather compensation then the WT60 should act as an internal temperature limiter. The temperature it's set to i...

11 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Mitsu Wireless Controller and MelCloud

Hi David We have an FTC7 but the settings seem to be similar to an FTC6. Our room sensor settings are: Zone sensor selection sets zone 1 to RC1 ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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