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Derek M
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Derek M
@derek-m
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Illustrious Member
Joined: Mar 4, 2021
Last seen: Sep 19, 2024
Profile Activity
Topics: 7 / Replies: 4405
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RE: Grant Aerona Setback

I think that you will find that the 'soft' start for an electric induction motor is only over a period of seconds, to limit the current inrush. The ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

Just a note of caution. Correctly optimising the WC curve can literally take weeks to achieve dependent upon variations in weather conditions. Only ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Grant Aerona Setback

It is interesting to see how the compressor appears to go up to maximum speed when the actually LWT is quite low when compared to the target value, wh...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

If I am understanding correctly, your WC curve is set to LWT of 35C @ OAT of -4C and LWT of 30C @ OAT of 20C. So at an OAT of 0C, the LWT should be in...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@cathoderay So on your particular system, when in setback mode, the whole system appears to be disabled, including the water pump or pumps. When cyc...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Is the Grant controller a thermostat?

It may have been adequate a few days ago, when the OAT was higher, but now 35.5C could be inadequate. Your system cannot be operating in WC mode if ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona Setback

@cathoderay The data that you are providing is extremely useful, because it not only provides a better insight into how heat pump controllers appear...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant AroTherm controls issue

If you run your heat pump on a fixed LWT, the IAT will likely vary with changes in OAT. Applying a 1C setback may have just made matters worse. If y...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

That would be the case if the water pump keeps running for the whole compressor off period. I believe that some heat pump controllers can be set to ru...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

I would suggest that you check the location of the temperature sensor on your hot water cylinder, since if it is fitted too high up the cylinder you m...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

@jamespa Hi James, I would welcome your thoughts on the following. Calculating the thermal energy output from heat emitters is fairly straightfo...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: New installation not quite right, advice sought

@guthrie I know that some controllers can be removed from their main housing and relocated using a suitable extension cable, but I'm not certain if ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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