Balancing

[a9blue]

I have 7 radiators running off a 30KW combi in an average sized end terrace. The biggest one is 5000 BTUs.The rest are much smaller.
The pipework runs in 22mm from the boiler for about 3M before dropping down to 15mm for the rest of the system.
I have one or two radiators which dont seem to want to balance.
The boiler pressure is on 2 bar, can anyone help?

 

[JPC]

your system should not need much balancing as its quite small...however

- check the cold ? rads will warm up by closing the other rads down and opening these fully.

If they do then its a matter of closing down (nearly) the rads nearest to the boiler and progresively opening the rads more the further down the run