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Is this normal behaviour for my samsung ashp

 
Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 9 months ago
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 wawyed
(@wawyed)
New Member Member
Joined: 9 months ago
Posts: 2
Topic starter 09/01/2025 6:46 pm  

I've just noticed the following behaviour on the heatpumpmonitor and I was wondering if someone could tell me if it's normal:

 

image

 

You can also see it here https://emoncms.org/app/view?name=MyHeatpump&readkey=b3a7b99ad8fc6d53a53fd4182026dd92

 

I know heat pumps try to modulate so maybe it's just that just looks a bit weird on the monitoring the constant fluctuation of COP and flow temp



   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 870
10/01/2025 4:31 pm  

@wawyed  Mine isnt doing that, is your water pump PWM controlled?

 

image

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 wawyed
(@wawyed)
New Member Member
Joined: 9 months ago
Posts: 2
Topic starter 10/01/2025 6:24 pm  

Yes, I believe it is. The flow rate seems to change on the monitoring.

 

EDIT: Just checked it's a Grundfos UPM4


This post was modified 9 months ago by wawyed

   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 870
11/01/2025 11:17 am  

@wawyed Thats the only thing I could think of that might account for the difference. It looks odd but I doubt its affecting COP much


House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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