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newhouse87
@newhouse87
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Joined: Mar 15, 2023
Last seen: Aug 16, 2025
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Topics: 1 / Replies: 230
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RE: Heat pumps and on/off working - starting to quantify it

@derek-m Essentially its the delta t causing my pump cycling, so i need to alter curve so rwt isnt getting so close to lwt. That indicates to me that ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

@derek-m Looks like i have gone too low so with the wc curve @32-5 and 25@20 so. Seems to keep house warm at that curve though just have introduced cy...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

@derek-m hmm, was hoping for an easy solution, cant say i have had this issue running at higher lwt or at least i dont know i had. House is warm and i...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Just an addendum, leaving for the night shift an hour ago, lwt was at 27 and rwt 24.1, flowing approx half of capability then shut off again. Essentia...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

@jamespa mine is daikin altherma low temp split, its all enclosed, no external pump, but prob has to have internal modualting ump i suppose. So if d...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pumps and on/off working - starting to quantify it

@derek-m Thanks, was calculating it as average between cold and warm end and was getting near that@30 but wasn't sure if that was correct. Luckily i t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

@jamespa Oh, so ill just lower cold end again so as i think house is warming up too quick and im having to stop the pump.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Have desired temperature on front screen but think that changes with the curve.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pumps and on/off working - starting to quantify it

@jamespa No DHW cycle is 2-3pm, this was much later. Judging on my curve, @7.2deg, what should flow temp be? Maybe its ok. Using lot less KWH last few...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Hi lads,any idea why my flow temp would be this high when my curve would suggest it should be lower. I have attached pics.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pumps and on/off working - starting to quantify it

Had cop of 3.7 for yesterday/this morning, that seems lot better then what i had last winter, 3.04 last winter but that included dhw. Freezing at 5am ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pumps and on/off working - starting to quantify it

@jamespa ah hoping to heat 530am to 9pm. Noise of pump keeps me awake. Hoping that house being well insulated will have reasonable heat loss overnight...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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