Air in central heating.......

[raucouspie]

Hi All
I have removed a few rads in my house due to new barthroom and lounge and had a repair in the pipework done by a plumber but now the system is back on (still with removed rads) there's tonnes of air in the system and the pump is knocking it's brains out on an hourly basis....

I am concerned the pump will die if this keepd up

Could anyone enlightent me on how long the air will take to clear or where it's comming from, have checked the Rad valves and the new fix and all seems well.... have old Baxi boiler, tank and 3 port valve system...

Thanks

[htg engineer]

Vent all radiators and pump - this should clear most of the air. Venting the pump should solve the problem with the noise.

Are the radiators and water heating up ? if yes then once the pump is vented it should all work fine again.

[raucouspie]

When you say "vent pump" what do you mean exactly, there's an air trap device above the three port valve do you mean here???

[bonzo]

You can vent the pump by unscrewwing the flat head screw on the front of the pump until water gets out.

[raucouspie]

Thanks both I'll give it a go.... had to drain the system again to install two new rads so it's back to square 1

[raucouspie]

Hi all
Had a look at my pump and discoverd that the large flathead screw is facing the tank and there is no way i can get a srewdriver on it, Is it possible to rotate the pump through 90 degres so i can get to the screw.
If so could anyone enlighten me.......

[marrtin]

Releasing the large flange nuts at each end of the pump will allow free rotation of the pump.

However, be aware that it is essential that the motor shaft within the pump remains totally horizontal otherwise excessive wear to bearings will occur.

[roger196]

Try an obstruction screwdriver or file a flat on a thick washer or penny and rotate that with an adjustable wrench.

[muzza]

Its best to keep the pump in the vertical plane with the shaft horizontal and another "TOOL" that cn be used in tight spaces is a 2p coin