Combi help needed

[Sly]

I have a problem with my Glow worm 80E combi boiler that has me baffled.
Perhaps some one here can help me

I have been getting really heavy water flow from the overflow/ PRV drain,
So I fittted a new PRV ........still exactly the same.

Other facts

The PV is dry and charged to 0.6 bar ( via foot pump)
If I shut of the CW feed the overflow stops but the CH pressure remains at 0.7 - 1.0 bar.....CH operates no problem......

pressure always as the book.

I can see no physical connection from the CW feed (not the refill circuit) to the overflow other than a possible leak through the Plate Heat Exchanger.......but if this was so why does my CH pressure not drop to zero when I turn off the CW feed and leave the system idle.


I am baffled any clues?

Thnx Sly

PS I am not a heating engineer so I may have all this completely round my neck

 

[Sly]

OK time for an embarrasing admission


After further searching I discover that the WC cistern overflow is piped into the boiler overflow (behind some paneling).............just goes to show check everthing first.................but look on the brightside
I discovered this great forum where there seems to be plenty of people to help. Thnx for scratching your heads at an impossible problem


Sly

 

[ChrisR]

The boiler's Pressure Relief Pipe should be in a position where scalding water which it might emit, is not a danger to anyone. Is that the case!?

 

[Sly]

The pressure relief drain is About 10 ft off the floor but i suppose It could spray onto some one,
extending would not be hard into a definately safe position,
Any limit on length if I keep a decent fall on the pipe?
Also only use copper because of the heat?

Thnx Sly

 

[ChrisR]

Best to separate it from the wc overflow really. It should be copper. The usual make-safe is to turn the end back to point towards the wall. That's still not OK if it's over a door. There are no particular regs on length; a few feet is not a problem.