A
andywilde16
Hello,
I am after some assistance with the issue I have with my Open Vented, Fully pumped Central Heating system.
I have a Glow Worm Ultimate 60BF boiler, Sunvic MoMo 3 Port Mid-Position Valve, Sunvic Digi Stat, Sunvic Programmer, TRV's fitted to all but 2 rads, Honeywell Tank Stat and a Wilo Gold RS pump
The issue I have is that the HW only works without issue and so too does HW and CH until the HW is up to temperature. Once the hot water is up to temperature or CH only is requested on the programmer the boiler fires for a minute or so and then goes out and the radiators do not get warm and cool water is circulated.
The only way I have been able to get this to work is to turn the cylinder stat up to 85 degrees and turn the boiler temp stat down but I have had a shower pump and kitchen tap newly fitted that have a max water temp of 65 degrees!!
I have had an electrician rewire all the components and the box in the airing cupboard, the pump has been replaced recently as to has the cylinder stat and mid position valve. The programmer too has been replaced and the electrician confirmed all the DIP switches are set right and it is set to fully pumped.
The pipework under the floor is 28mm reduced to 10mm close to the radiators where the 10mm tails run through the walls to the rads.
Could the issue be flow through the boiler causing the issue when the valve is in the heating only position as the boiler manual states "the flow through the boiler must not be allowed to fall such that there is a temp difference greater than 20 degrees between the flow and return"
If so how can this be resolved - balancing the radiators?
Any assistance would be greatly appreciated as I have ruled out the electrics, components such as pump and valve and the pipework appears ok so the only thing left is the boiler.
Thanks
I am after some assistance with the issue I have with my Open Vented, Fully pumped Central Heating system.
I have a Glow Worm Ultimate 60BF boiler, Sunvic MoMo 3 Port Mid-Position Valve, Sunvic Digi Stat, Sunvic Programmer, TRV's fitted to all but 2 rads, Honeywell Tank Stat and a Wilo Gold RS pump
The issue I have is that the HW only works without issue and so too does HW and CH until the HW is up to temperature. Once the hot water is up to temperature or CH only is requested on the programmer the boiler fires for a minute or so and then goes out and the radiators do not get warm and cool water is circulated.
The only way I have been able to get this to work is to turn the cylinder stat up to 85 degrees and turn the boiler temp stat down but I have had a shower pump and kitchen tap newly fitted that have a max water temp of 65 degrees!!
I have had an electrician rewire all the components and the box in the airing cupboard, the pump has been replaced recently as to has the cylinder stat and mid position valve. The programmer too has been replaced and the electrician confirmed all the DIP switches are set right and it is set to fully pumped.
The pipework under the floor is 28mm reduced to 10mm close to the radiators where the 10mm tails run through the walls to the rads.
Could the issue be flow through the boiler causing the issue when the valve is in the heating only position as the boiler manual states "the flow through the boiler must not be allowed to fall such that there is a temp difference greater than 20 degrees between the flow and return"
If so how can this be resolved - balancing the radiators?
Any assistance would be greatly appreciated as I have ruled out the electrics, components such as pump and valve and the pipework appears ok so the only thing left is the boiler.
Thanks
