My Worcester 28CDi RSF has a minimum pressure level of 1bar indicated on
the pressure gauge.
What should the optimum pressure be? When should I re-pressurise the
system? When it falls below 1bar cold or hot?
Also should I only bleed the rads with the boiler powered down, powered
up but not burning or while it's heating?
OK to answer my own post, I have got the installation manual now!
1 bar is the correct cold pressure.
2.5 bar is the max test pressure when cold.
I'm still not sure if it's best to bleed rads hot or ocld, with or
without the pump running.
On a traditional system, definitely when stopped, as it can easily suck air
(and frequently does). On a pressurised system at 1 bar, the 0.5 bar or so
maximum head of the pump will ensure that every valve will blow rather than
suck, so you can be lazy and not bother going downstairs to turn it off,
like you should!
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