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how do i put air pressure into my ferroli bolier model optimax he 31 c ?

i need to know how to put air pressure into my ferroli bolier model optimax he 31 c. i need to know which valves to turn ?
MRS L MCDONAGH, January 2012
Look for a flexible metal braided pipe, It will be very close to the boiler, that will have a valve on it. BUT, that will put water in to the system, NOT Air. Fill to about 1 bar

SD, January 2012
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