prob

picko · 15 Dec 2006

seems to be air in central heating ,could leaking rad valves draw air in when working.

cross thread · 15 Dec 2006

yes if the system is a negative, ( pump sucking water round)

JohnD · 15 Dec 2006

Much more often it is gas produced when the steel radiators corrode.

Has the system been clean and refilled with inhibitor?

What colour is the water that squirts out when you bleed the rads?

Is it a sealed system or has it got a feed and expansion tank in the loft?

picko · 16 Dec 2006

JohnD said:
Much more often it is gas produced when the steel radiators corrode.

Has the system been clean and refilled with inhibitor?

What colour is the water that squirts out when you bleed the rads?

Is it a sealed system or has it got a feed and expansion tank in the loft?

system has been drained and refilled water comes out pretty clean it has feed and an expansion tank in attic

picko · 16 Dec 2006

gordongas said:
yes if the system is a negative, ( pump sucking water round)

how do you find if is a negative ,how would this make a difference

Rob · 16 Dec 2006

picko said:
gordongas said:

yes if the system is a negative, ( pump sucking water round)

Click to expand...

how do you find if is a negative ,how would this make a difference

you need to know where the cold feed enters in relation to the pump.

ChrisR · 16 Dec 2006

Where's the pump, logically speaking.
Does the flow from the boiler go
boiler> Vent> feed pipe > pump > motorised valve(s)
, or what?

MAybe the pump's on the return???

doitall · 16 Dec 2006

picko said:
gordongas said:

yes if the system is a negative, ( pump sucking water round)

Click to expand...

how do you find if is a negative ,how would this make a difference

Open an upstairs radiator air vent with the pump running, does it suck air in or let water out.

That is the difference, one you cannot bleed with the pump running.

picko · 16 Dec 2006

ChrisR said:
Where's the pump, logically speaking.
Does the flow from the boiler go
boiler> Vent> feed pipe > pump > motorised valve(s)
, or what?

MAybe the pump's on the return???

it comes from boiler tees off to vent then tees from feed to pump then into three way vavle splits one warm water one goes through imm tank

picko · 16 Dec 2006

doitall said:
picko said:

gordongas said:

yes if the system is a negative, ( pump sucking water round)

Click to expand...

how do you find if is a negative ,how would this make a difference

Click to expand...

Open an upstairs radiator air vent with the pump running, does it suck air in or let water out.

That is the difference, one you cannot bleed with the pump running.

it still vents water through bleed screw

picko · 16 Dec 2006

rob884 said:
picko said:

gordongas said:

yes if the system is a negative, ( pump sucking water round)

Click to expand...

how do you find if is a negative ,how would this make a difference

Click to expand...

you need to know where the cold feed enters in relation to the pump.

the feed from tank in attic is just before the pump which flows into 3 way valve

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

prob

Similar threads