Repressuring Combi boiler only for HOT WATER?? w/o CH

[shocksl]

is there a way of repressurising a combi boiler so that only the hot water works and not the central heating.

Reason I'm asking is because we have taken the rads off due to decorating the house.

The boiler has been drained and requires repressurising, to only allow hot water for taps and shower and not the CH.

Below is my boiler with details:
http://vokera.co.uk/wp-content/uploads/2009/04/unica-he-installation-and-servicing-manual.pdf

 

[Phill Peck]

You can repressurise then close the valves on boiler and re drain

Obviously if u have open ends that my be a problem

 

[shocksl]

how would i do that? would that exclude the CH, rads etc?

 

[Phill Peck]

Fill the system up as normal then close the 2 valves on the bottom of the boiler. it's the 2 pipes closest to the left hand side

It may be possible to close the valves and then fill but depends on the valves/connections. I can't remember what they are like on this boiler.

Turn ch dial to 0 aswell

 

[shocksl]

the problem i have had is... I dont know if im doing it wrong!

I tried filling the boiler up.... with the already pipe connected at the bottom of the boiler. But the water started spirting out in some of the rad pipes which are disconnected upstairs.

So I payed a pro to do it. He has done it without a problem! he said only the water will work for time being. Then after a week the pressure dropped down to 0. I had to call hiim again. He did it again. Again advising me not to use CH until rads are back on .

I never can see what he is doing donwstairs with the boiler as he tells me to wait upstairs... obviousily trying to milk more money out of me n not showing me how its done.

So what do you think im doing wrong? When i do it, water ends up coming out of the disconnected rad pipes. when he does it, it doesnt. I dont quite get it.