VITODENS 200 WB2A - Heatingspares247.com

3 Installation Requirements3.5 Central Heating SystemPUMPThe available head shown in figure 3/F is that in excess of the appliance hydraulic resistance,i.e that available for the system.EXPANSION VESSELThe table below shows the maximum system volume that the integral expansion vessel cansustain under different charge pressure conditions. If the system volume exceeds thatshown, an additional expansion vessel must be fitted and connected to the heating systemprimary return pipe as close as possible to the appliance. If an extra vessel is required,ensure that the total capacity of both vessels is adequate. Further details are available in thecurrent issues of BS 5449 and BS 6798.Note: If the pressure gauge indicates 2.5 bar or greater when the appliance is at maximumtemperature with all radiators in circulation an extra expansion vessel is required.PRESSURE GAUGEA pressure gauge is situated on the appliance control panel. This can be viewed by loweringthe plastic panel cover.PRESSURE RELIEF VALVEA pressure relief valve set at 3 bar (43.5 psi) is supplied with the appliance.Expansion Vessel Requirements (In accordance with BS 5449)Vessel charge and initial system pressurebar 0.5 1.0 1.5psi 7.3 14.5 21.5Total water content of system using10 litre (2.2 gal) capacity expansion vesselsupplied with appliancelitres 106 75 42gallons 23 16.5 9For systems having larger capacity, multiplythe total system capacity in litres (Gallons)by the factor to obtain the total minimumexpansion vessel capacity required0.0833 0.11 0.1618