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2.2 SystemPressure
When the appliance is connected to a sealed central heating
system,thesystempressureshouldbecheckedperiodicallyby
means of the pressure gauge at the expansion vessel (see
Figure 4). The WS18 appliance comes complete with an
integrated expansion vessel, pressure gauge and filling loop.
Theminimumpressure,asindicatedbytheblackneedle,must
notbelessthan0.5barwhentheapplianceiscoldandtypically
around 2.5 bar when the appliance is at normal operating
temperature. If the pressure is outside this range contact
Warmfloworyourinstaller.
2.3 SystemFilling
Afterthesystemhasbeenproperlyfilledthepressuregaugeshouldread1bar(refertoFigure
4)whenthesystemiscold.Thevalvemustbefullyclosedandtheflexiblefillingloopremoved
fromthevalveinaccordancewithbuildingregulations.Expectasmallwaterlossfromthepipe.
At filling or refilling of the system, special attention must be given to the concentration of
corrosioninhibitorsinthesystemwater.Where thereisaneedfortoppingup, concentrations
mustberestoredtoinhibitormanufacturers’recommendationsandmonitoredgoingforward.
Frequentorroutinetoppingupofthesystemshouldnotbenecessaryandmayproveharmfulto
the appliance. Should topping up prove necessary on a frequent or routine basis you must
contactWarmfloworyourinstaller.
ForfurtherinformationrefertoSection3.2SealedSystems(seepage17)
2.4 UserControlInterface
Theappliance’susercontrolinterface(seeFigure5)hasbeendesignedtomaximisetheease
ofuseandefficiencyoftheheatingsystem.
All user interactions with the appliance are via the display panel. Hence the display panel
shouldbemountedataneasilyaccessiblelocation.Theusercontrolinterfaceprovidesaccess
to appliance parameters such as temperatures, cleaning alerts, servicing and pellet level
indicatorstogetherwithcommissioningandservicesettings.
