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Just a thought is the lockshield fully open ?
Discuss Just fitted K3 radaitor and the centre front panel won’t heat up in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net
Yes the lock shield is fully open. I have fully opened both valves. I will contact stelrad to see if there is anything they can suggest. Any other ideas I am all ears.Just a thought is the lockshield fully open ?
Yes the lock shield is fully open. I have fully opened both valves. I will contact stelrad to see if there is anything they can suggest. Any other ideas I am all ears.
Looks like a circulation problem as the return is only warm, if the water was short circuiting then the return would be very hot, surprising the return isnt hot even with all the other rads shut off, even if it was circulating 7LPM then the 15mm tails should be OK except that they are exceptionally long. I think there may be air trapped in there somewhere interfering with the flowrate except a lockshield throttled or its been inadvertently piped up as a one pipe system.
I think L/S valves have a valve co efficient of 1 so 2 might require a dP of ~ 3.5M at a flowrate of 7LPM ().42m3/hr). A UPS 2 will give a head of 6M at this flowrate so there certainly should be no problem in driving the water through that rad especially with all other rads isolated but the return temperature should only be 4 or 5C lower than the flow temperature, this wasn't happening, the only conceivable reason for this from a pump point of view is that the pump is not running in full speed mode 3 but is on one of the proportional pressure modes which are hopeless on this pump, PP3 will only give a flow of 0.42m3/hr at a 1.6M head but this should have shown up before changing out the rad?.
Looks like a circulation problem as the return is only warm, if the water was short circuiting then the return would be very hot, surprising the return isnt hot even with all the other rads shut off, even if it was circulating 7LPM then the 15mm tails should be OK except that they are exceptionally long. I think there may be air trapped in there somewhere interfering with the flowrate except a lockshield throttled or its been inadvertently piped up as a one pipe system.
I think L/S valves have a valve co efficient of 1 so 2 might require a dP of ~ 3.5M at a flowrate of 7LPM ().42m3/hr). A UPS 2 will give a head of 6M at this flowrate so there certainly should be no problem in driving the water through that rad especially with all other rads isolated but the return temperature should only be 4 or 5C lower than the flow temperature, this wasn't happening, the only conceivable reason for this from a pump point of view is that the pump is not running in full speed mode 3 but is on one of the proportional pressure modes which are hopeless on this pump, PP3 will only give a flow of 0.42m3/hr at a 1.6M head but this should have shown up before changing out the rad?.
Reply to Just fitted K3 radaitor and the centre front panel won’t heat up in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net
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