Combi draining-step by step

[bones75cbr]

Right Guys. hae been having a browse for this info but there seems to be lots of different ideas.

I need to move some pipework for a couple of rads so need to drain down the system to do this.

The boiler is a Vokera maxim 24 combi boiler.

so whats the best way to get the system empty to let me do this. and also refilling?

I know its been asked before

Also i basically just want to cut the pipework and put in a couple of "turn off" valves for the time being so would this "feeze spray" be any good for that??

Cheers in advance

 

[kevplumb]

will make life a lot easier if you can freeze the pipework
fit full bore valves tho

 

[bones75cbr]

Cheers might try that option.

 

[bones75cbr]

Right...

I took the drain down option and have completed the work and refilled the system as per the guidance on a couple of other posts. The rads all get hot and there is no "banging or clanking" from the booiler. The hot water also gets hot.
The boiler pressure is reading about 1.2bar.....

But im getting a staedy drip from the overlow run off in the boiler??

What can i do to remedy?? any ideas.

 

[kevplumb]

replace the prv

dont use it as a drain

 

[bones75cbr]

Drained it from the drain off point at the bottom of the pipe run and did everything in order so really dont understand why its started this dripping now.

Cheers,

 

[kevplumb]

whats the pressure in the system

 

[bones75cbr]

its reading just over 1 about 1.2 ?

 

[kevplumb]

you must have gone over 3 when filling to get crud under the prv

need's renewing

 

[bones75cbr]

no definatley stayed around the 1.5 bar mark all the time. i vented the pump and all the radiators.

However the system is currently runnnig two less radiators could this have any effect?

Thanks for the info.

 

[kevplumb]

no shouldnt make any odds