Air Seperator

[paulw1]

I need to replace the seperator on the CH. I took it out a few years ago because it was blocked! Since then I keep having problems with air in the system!Now I know what it is for I know it goes on the feed from boiler to pump,but have forgotton which way round! I know the top feed goes to vent pipe,which way do the side feeds go,is it lower feed to boiler end and higher feed pipe to pumpside. I bought the seperator from toolstation (75473)
Can anybody help please

 

[seco services]

higher end to the boiler lower to pump.

 

[bengasman]

Did you clean the system thoroughly when you cut it out?

 

[paulw1]

Did you clean the system thoroughly when you cut it out?

No I didn't. But have done since,a few times. the system is pretty old.I have put descaler etc in and an inhibitor.

 

[doitall]

If you're having problems with air, you should look at how it's all connected up wrong and rejig the pipework so it's right.

 

[paulw1]

Thanks That is my next job.too many bends near the pump, i am trying to straighten the runs out

 

[doitall]

Thanks That is my next job.too many bends near the pump, i am trying to straighten the runs out

If it's pipe up properly, you don't need the air separator. perhaps a sketch or pic so we can see whats what.

 

[bengasman]

No I didn't. But have done since,a few times. the system is pretty old.I have put descaler etc in and an inhibitor.

You will have to flush that stuff out; just sticking descaler in is not going to solve the problem.
After that, you should treat it with x800 or similar, maybe even run it with hyperflush for a month before you do that.

 

[paulw1]

No I didn't. But have done since,a few times. the system is pretty old.I have put descaler etc in and an inhibitor.

You will have to flush that stuff out; just sticking descaler in is not going to solve the problem.
After that, you should treat it with x800 or similar, maybe even run it with hyperflush for a month before you do that.

I flushed all the old stuff out,water is reasonably clean now, well as clean as 15 year old system can be! I have replaced,pump and put in a seperator, but still the water will not circulate.It is getting hot in the boiler,a few wobbly clunks and it shuts down.Doesn't sound like ait i think the water is boiling. All the pipes right up to the airing cupboard are cold, but very hot in the boiler. I haven;t replaced the 3 way valve, could it be that?

 

[seco services]

did you bleed the pump ?

 

[paulw1]

did you bleed the pump ?

Yes and the seperator is doing it's job, i can hear the air gurgling up the vent pipe!

 

[seco services]

what have you got on calling for heat ? hw or heating ?

 

[paulw1]

I only have the rads on,trying to circulate the water quicker!

 

[seco services]

put both on then the valve will open both ports and release any trapped air.

 

[paulw1]

Thanks for that,
Switched both on now. Feed pipe from boiler is hot but seperator which soldered right next to it is cold at the moment. Also I use to hear the valve whirr as it moved across, but I can't hear it now?