central heating problem

[neilfx]

We fitted two new radiators to our gas fire central heating system yesterday.Now there is a constant dripping of water now from a small pipe on the outside wall of the house which is located beside the central heating valve.

 

[GPlumb]

How did you empty the system before fitting the new radiators? Through the PRV perhaps?

 

[neilfx]

i drain it through drain valve at lowest point of system

 

[gas4you]

What pressure have you re-pressurised the system to?

Is the filling loop turned off properly?

 

[DP]

I always use the PRV to drain the boiler. This is a safety component. If it is not operated, how does the heating engineer/ plumber know it is not stuck solid thus not lift at 3bar when it has to?

 

[neilfx]

Thanks for your help. Can you tell me what is the filling loop?
The pressure is not getting up above half a bar, despite much pumping! There is a bleed valve coming off the pressure vessel, but when i open it nothing comes out, neither air nor water.

 

[John506]

A filling loop is a flexi connection going from your mains cold to the return on your CH pipework.

 

[neilfx]

Thanks, there is no filling loop, the system is filled at the expansion tank in the attic. My plan is to replace the PRV and see what happens. i will let you know,
All the best

 

[neilfx]

Have replaced the PRV and system is working perfectly! Thanks for all your help, I really appreciate it.