F n e tank vent pipe dripping

[Riley]

And if I had learned anything in this job customers lie

 

[Burger]

I'm only taking the owners word for it, he drained the central heating system before I arrived at his house. He said he would fill the system back up himself as he was moving a bathroom radiator which was fine as I connected the immersion. It's weird coz he said didn't drip before but how would you know if it did or didn't? In less the overflow was discharging.

He’s blaming you, but he drained the system before you arrived - very dodgy territory.

 

[Best]

If it is the vent pipe dripping (pumping over slightly) then I am guessing the new cylinder coil is more restrictive, or there is crud pulled into pipe when system was drained, which would cause a restriction.
Keep any balancing valve on cylinder coil full open to see if that helps.

 

[Inverness]

It was 28mm connected to the coil but I remove about 2oomm of pipe and reduced it 22mm pipe would this be enough resistance for it to pump over?