WET UDF MANIFOLD FLOW POTS

[Sig_star]

Hi
Can anyone please tell me these flow pots on my new 12 port manifold.
When I get the first one to the flow I need the next one robs the one I just set and by the time I am at about number 5 flow pot there is no room to adjust the next pot and the others I just set are showing less than 0.5 LPM flow. When I just set them to 2.5 to 1.5 depending on what zone it was for.
Do I just do one zone at a time and lock off to move to next zone and the readings after are wrong but its set still to what I wanted?
Also as the system heats up I notice the flow pots just set creep up to nearly no flow how can this be?

Its not the pump Tested and having the mixer out all 12 pots can flow to near 5 lpm if I want them too.
Its not air.
Its not crap in the system.
and pots work as they should.
Thanks all

 

[Sig_star]

I have also been to a family's house that has a udf setup and noticed. one zone was calling with great flow 3 lpm but when I asked to up the other zone stats by the time 3 more come on there is hardly any flow for all 4 zones now. So what is the point in these flow meter pots. Its not like your going to only have one zone on at a time. when you want the heating on most if not all will be calling.
Thanks

 

[Sig_star]

Bump

 

[Nozzle]

Just shooting from the hip here. Try doing it backwards, with all loops calling for heat and knowledge of which of your loops is longest (highest resistance to flow) and shortest. Open them all up and whichever is the lowest flow is the longest loop. Don't bother throttling this. Start with the highest flow (shortest loop) and by trial and error, continue to throttle in until they're all equal. The smart pump should attempt to maintain the same diff pressure no matter how many/few loops are calling for heat.

Nozzle

 

[Sig_star]

Just shooting from the hip here. Try doing it backwards, with all loops calling for heat and knowledge of which of your loops is longest (highest resistance to flow) and shortest. Open them all up and whichever is the lowest flow is the longest loop. Don't bother throttling this. Start with the highest flow (shortest loop) and by trial and error, continue to throttle in until they're all equal. The smart pump should attempt to maintain the same diff pressure no matter how many/few loops are calling for heat.

Nozzle

hey nozzle,
That’s the issue you see, when all are fully open they just sit at above 0.5lpm fully open no room to adjust.
Even if I say did 5 at a time same issue. thanks

 

[Nozzle]

Is the pump correctly specified? 12 loops is a biggun.

Nozzle

 

[Sig_star]

Hey well that was my thinking as I know 12 is a big manifold. But as you know soon as mixer out the loop pulls all 12 pots to 5lpm. So it’s strong enough got to be.
What u think?

 

[Sig_star]

I mean even if it was a 6 port would struggle with mixer complete. It’s a proper good pump.

 

[Nozzle]

My Pump has different modes of operation, it sounds to me likes yours is spinning down and operating on the wrong curve.

What selections are available on your pump?

Nozzle

 

[Sig_star]

Hey I have a grundfos spec below with settings can u tell me what’s best for me? I have tried them all however. I am pushing only 2 ground and 1st floor so approx 2m
Thanks

 

[Sig_star]

My Pump has different modes of operation, it sounds to me likes yours is spinning down and operating on the wrong curve.

What selections are available on your pump?

Nozzle

witch setting you think Nozzle? again I am running ground and 1st floor so aprox 2/2.5m height.
Thanks mate