Shifting trapped air from CH after re-fill?

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Hi

Can some please offer me some advice: I am re-filling my CH system today after a drain down but it seems to be taking ages to re-fill. Upstairs are the ones - downstairs seems ok but upstairs I have vented rads and hear hissing but no water yet, one rad just a few splutters.

Is this normal? Or has anyone had a similar experience? How can I shift this air that seems to be trapped?? It is driving me crazy!??! :(
 
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Dammit, youre quick seco

________________________________________

Pooley,

What kind of system is, boiler & cylinder or combi.

Either way the quickest way to get rid of the air is to back fill. Attached hosepipe to drain cock on lowest rad and turn it on.

If on combi just fill until gauge at right level, if on open vented keep filling system until you (pref helper) can hear/see water emptying into f&e from vent pipe.

One quick question, if you are on open vented do you have the 3way valve in the maual position.

Rico
 
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Hi guys - i have an o/v system - 3 port valve is open manually!! is the backfill safe? i won't flood the house out or anything??
 
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not as long as the hose don't come off the draincock.

but i would want to know why its filling slow. ie muck etc.

sometimes running the pump can shift a airlock. providing theres enough water in the system
 
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I do not know, the system may just have been badly piped up?? It is still the same .... maybe i'll do the back fill
 
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