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Grundfos CH circulation pump

 
Air Source Heat Pumps (ASHPs)
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 DavidAlgarve
(@davidalgarve)
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Joined: 1 year ago
Posts: 107
Topic starter 21/12/2023 10:56 am  

I have a Grundfos UPM2 25-70 180 pump, circulating from a buffer tank with no means of checking or changing speed and I suspect the flow is not balanced to Ecodan.

There is no cable connected to what I suspect is the PWM 3 pin connector.

Could someone please advise on what is required to introduce PWM and thus vary the speed, possibly with speed indication

I am reasonably tech-savy but have no experience of PWM


   
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