Tons of air in rads all the time how can I remove it???

[azza111111]

Hi just recently I replaced the 3 port valve and pump for my central heating system,Rightly or wrongly I drained the emersion heater tank.

I now have alot of air that I contsatnly have to bleed from the radiators upstairs for about 30 secs each rad each time I run the system,All get hot after bleeding.
Lots of air comes out first followed by water.

How can I get shot of this air? or do i just keep bleeding the rads for god knows how long?

Its an oil fired boiler by the way.

Any help would be much apreciated.

Thanks Aaron

 

[D_Hailsham]

Have you checked that there is a low from F/E tank into the system? Do this by draining a litre or two from a drain valve while someone watches the water level. Make sure the ball valve opens before the level reaches the feed pipe. If this is OK:

1. Turn system off and allow water to cool down
2. Lock the mid-pos valve in the manual position
3. Make sure any TRVs are not stuck shut
4. Bleed rads on the ground floor
5. Bleed rads on first floor
6. Repeat 4 and 5 until no air appears.
7. Unlock mid pos valve
8. Turn system on
9. Reset TRVs

 

[azza111111]

I have an update:

lots of banging in pipes,trapped air?

cant get radiators to fill with water upstairs just air no water coming out of bleads,downstairs are always full when i check,water tank in loft is full and ,pump is new and pumping strong,3 possition valve is new and working.



Any further ideas would be much apreciated,Thanks

 

[seco services]

just cause the tanks full don't mean its getting into system.

cold feed pipe may be blocked.

 

[azza111111]

hi thanks do you mean the pipe that comes from the bottom of this tank?

 

[dextrous]

hi thanks do you mean the pipe that comes from the bottom of this tank?

yes

 

[azza111111]

Im not sure which pipe this is as it enters the airing cupboard?? is there a way i can check?

 

[seco services]

if you shut or tie up the ball valve mark the water level in the tank then drain a bowl full from downstairs draincock etc.
then check the tank level, bet it hasn't gone down.

 

[azza111111]

if you shut or tie up the ball valve mark the water level in the tank then drain a bowl full from downstairs draincock etc.
then check the tank level, bet it hasn't gone down.

ok i can try this,so i drain from where downstairs sorry? im not as clued up as id like here.

Ta

 

[seco services]

tie or shut off ball valve feed
mark water level
drain lowest rad or draincock.

 

[dextrous]

If seco is right (and he usually is), then you could try connecting a hose to the drainoff valve and forcing water backward by attaching the hose to a tap. If this works, then drain, flush through until water is clear, then desludge and add inhibitor as per (chemical - eg fernox) manufacturers instruction.