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can i pressurise expansion vessel?

sime super 90 mk ll can i pressuries the expansion vessel it as a valve on which will take a pump if so what is the psi on them thanks
roy, December 2009
yes you can. Drain the heating system so the is no pressure in the boiler, unscrew the cap fitt a normal bike pump to it and keep pumping it there is about 1.5 bar in it, you can check the pressure gauge on the boiler or us a tyire pressure gauge.

erj, December 2009
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