i added a radiator...actually 2...

[itry]

i think i have a open vented system. i drained the whole system first. before connecting the new radiators

then this morning i turned the water back on to gently fill it up.

let the radiators fill up til they started leaking out of the bleed valves.

(did i need to do anything else special? slightly worried about the tank that leads into the pump)

...and possibly this is where i went wrong: i thought you were supposed to bleed the pump with it switched on ( well thats what my brother said!)'

so the pump whirred lots...intemittently hissed , and dripped...but the water didn't flow, like they did out of the radiators. is that normal?

have i missed any steps? the pump is a lot nosier , and i'm worried there's still loads of air trapped in

 

[kevplumb]

what's the system

 

[itry]

its an open vented central heating systrm where the water can be spearately heated for heating the room or tthe hot water taps.

is that what you mean?

 

[doitall]

Never have the pump running they are water lubricated no water = lots of squeeling and a new pump

 

[itry]

hmmm...but why isn't there any water there: it should have just filled up but my best guess now is there's an air bubble round there....

there's a small sealed tank just above it called the automatic recovery tank) and I'm wondering if 'its filled up/ how do I know? is this likely to be a problem?!

 

[ChrisR]

automatic recovery tank

Eh? Wossat? What's it connected to?
Do you have a small header tank eg in the loft?

Water doesn't exactly flow out of the pump with screw out, just a bit of a dribble which more or less stops.
Id there a vent point in the airing cupd/by the HW cylinder?

 

[itry]

Guys...thanks for your time.

in the end i just bled the system again ( i connected a hose pipe to varioys drain points)....and it seems to be a lot happier now. fingers crossed!

as for the automatic recovery wotsit , thats whats written on the label!....a small copper sealed tank.

 

[brumylad]

post a photo sounds like a rarity