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RobS
@robs
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Joined: Oct 15, 2024
Last seen: May 25, 2026
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Topics: 0 / Replies: 134
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RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @sheriff-fatman The interactive versions are much better as trying to see details and cause & effect on the multiple graphs is not easy. But...

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

Hi @sunandair Thanks. The chart shows all the power/energy flows in the heating system, electrical and thermal. 1. The energy to replace the defr...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @sheriff-fatman Cycling at 5C and below is usually defrosts. The other cause can also be an internal thermostat cycling the heat pump due to the...

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

Hi @sunandair I hope the annotated image and description below helps describe what is happening.       A) Output falling d...

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

Hi @cathoderay Yes the bulk of the energy comes from the already heated water, you can see that as the yellow area above the blue dashed line in th...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @sheriff-fatman Freeze Stat is to stop the water in the outside pipework freezing when the heat pump is not operating (heating), it doesn't caus...

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

Hi @sunandair We also have a Mitsubishi Ecodan but we also have OEM's energy monitoring kit installed, so have access to data with far greater accu...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Advice for a novice on Mitsubishi Ecodan 6kW

Hi @green_fox As a we have a PUZ-WM80VAA with FTC7 (the 8kW R290 Ecodan) I might be able to add some Mitsubishi specific info...   As J...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

5 months ago
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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 ...

5 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.   ...

5 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 ...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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