31Installation and ServicingSECTION 2 - INSTALLATIONIMPORTANT - when filling:When filling there may be a slight water leak from the air vent therefore electrical connections should be protected.Filling1. Ensure filling loop is connected and all washers in place.2. Ensure dust cap on auto air vent is slackened off. Refer toSection 3.24.3. Check the following isolation handles on water connectionsare in the horizontal filling position (blue handle on DHWinlet A and black handle on CH return C ).Note. The CH flow isolation valve handle MUST be in thevertical position to enable filling.4. Slowly turn the filling loop handle (blue B ) to thehorizontal open position until the pressure gauge readsbetween 1 to 1.5 bar.5. Once the pressure gauge dial reads between 1 to1.5 barturn the filling loop handle (blue B ) back to the closed(vertical) position.6. Turn the CH Return handle (black C ) and the DHW Inlethandle (blue A ) to the open (vertical) position.7. Disconnect the filling loop from the DHW Inlet valve and fitthe grey cap to the open end.8. Fit the Plug to the free end of the filling loop.Note. Open all DHW taps to ensure water is flowing freely.Once satisfied close all taps.Top Up1. Ensure filling loop is connected and all washers in place.2. Ensure dust cap on auto air vent is slackened off. Refer toSection 3.24.3. Turn the DHW Inlet handle (blue A ) to the horizontalposition.4. Slowly turn the filling loop handle (blue B ) to thehorizontal open position until the pressure gauge readsbetween 1 to 1.5 bar.5. Once the pressure gauge dial reads between 1-1.5 barturn the handle (blue B ) on the filling loop back to theclosed (vertical) position.6. Turn the DHW Inlet handle (blue A ) to the open (vertical)position.7. Disconnect the filling loop from the DHW Inlet valve and fitthe grey cap to the open end.8. Fit the Plug to the free end of the filling loop.Note. Open all DHW taps to ensure water is flowing freely.Once satisfied close all taps.FILLINGAABCBC.......CONNECTIONS & FILLING CONTINSTALLATIONFilling Loop(Blue)Filling Loop(Blue)CH Return(Black) CH Return(Black)DHW Inlet(Blue)DHW Inlet(Blue)Cap CapPlug PlugFillingLoopFillingLoopFilling Positions shown Top Up Positions shown