Worcester 28 CDi - Pressure bar adjustment
I've got a Worcester 28CDi combi-boiler, which is around couple of years old. I remember that when it got installed, I was told that the pressure should be in between 1-2 (psi clock on the far right side).
Now, the pressure seems to have fallen to 0.5. After checking boiler manufacture's website & reading their manual, I realised the way I could increase it back to in between 1-2. However, once it reached 1.5, I took the "filling key" out but the bar continued to go up reaching on 2 now. I wonder what should I now do to drop it down to 1.5. Can anyone help (as it's not mentioned on the manual, which says about INCREASING the pressure but NOT about the decreasing).
What's the purpose of this, precisely
What's the minumum & maximum pressure I should keep
What's the effect of going below minimum & going above the maximum
Best Answer - Chosen by Asker
Firstly, i should say that i work for worcester, so here goes... The best operationg pressure for the 28CDi is between 1 an 1.5 bar pressure, if the pressure drops below 1 bar, then as you have done, use the filling key to re-pressurise the boiler, but to no more than 1.5bar... When the boiler is running, primarily during a CH demand, the pressure will rise, possibly by half a bar, depending on the size of your heating circuit. If when topping up the system, the pressure is above 1.5bar when the boiler is not working, then it isn't too much of a problem, but you can resolve the issue by draining a small amount of water out of one of your radiators (usually the first in the circuit). The boilers pressure gauge is set to 3 bar, so if at anytime the pressure does rise too high, it will dump water out through the overflow pipe, obviously if this happens regularly, then you will need to call a heating engineer, whether it be a Worcester service engineer or a local corgi registered engineer is your choice.
Source(s):
The telephone number to book a Worcester Service Engineer is 08457 256 206.
