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Author Topic: Advice on a balancing radiators with GSHP  (Read 3840 times)
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« Reply #15 on: September 29, 2018, 05:07:57 PM »

I have been watching this thread with interest, it is imposable to give a reasonable answer with the information supplied. Is it a radiator system only, are there zones, how many, is there a manifold, does it have flow meters, is it just one circuit with one stat, how many rads, have they been sized for low temperature. At 70 deg you can get away with poor pipe runs but at 40 deg with conventional rads things need to be better planned. Are the rads sized for the house heat losses. 
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« Reply #16 on: October 05, 2019, 10:51:41 PM »

I missed this reply, sorry.  It is all radiators on one circut and reasonably sized for each room.  However if they are all sized right and then the valves are all fully open at the start of the loop then surely the radiators at the far end would be struggling to get the volume of water required.

I did buy a clamp thermometer but given the lack of pipe (they come out of the walls) it is hard to read the temperature.

Having done some thought on this, the pump speed must be important.  If I force the circuit temperature to 60 degrees and then turn on the pump to maximum and balance with a 10 degree split.  Then if I reduce the pump speed wouldn't the temp split reduce even further as it is being given more time to cool in the radiator. So balancing should probably take place at a lower pump speed to allow the gshp more room to modulate on its own.

I ran out of time the other year and never got round to it. However, I am going to try Knight's method of slowly opening all an 1/8 at a time tomorrow.

I will let you know how it goes.  I should also say that I am delighted with the performance of the pump so far. However I struggle in life when I don't know that something is performing optimally. 

6.48kw Solar PV JA (300W)Panels, SolarEdge inverter
Borehole -> Nibe F1255 12kw GSHP -> Radiators
Nissan Leaf
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