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Mend Vaillant ecoMAX828/2E Boiler Pressure Heating

Vaillant ecoMAX828/2E?

Can someone please explain to me, with the aid of a diagram if poss, which tap to turn to increase the water pressure in my c/h system and whether this tap should be turned with c/h system and boiler on or off?
The system is at present showing about .8 BAR and I know one rad needs bleeding so a much higher pressure is needed.

Thanks anyone who can help

David
June 2009
VaillantVaillant ecoMAX828/2EHeating, Home Heating SystemsBoiler Pressure Heating

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