4.3.2 Location of the boiler .............................................21
4.3.3 Main dimensions ...................................................26
4.4 Hydraulic connections .......................................28
4.4.1 Flushing the system ..............................................28
4.4.2 Connection of the heating circuit ...........................28
4.4.3 Connecting the condensate discharge pipe ..........29
4.5 Gas connection ...................................................30
4.6 Connections for the air and exhaust
pipes ....................................................................30
4.6.1 Classification .........................................................31
4.6.2 Outlets ...................................................................31
4.6.3 Lengths of the air/flue gas pipes ...........................32
4.6.4 Additional Directives ..............................................35
4.6.5 Connection of the combustion gas exhaust
pipe .......................................................................35
4.6.6 Connection of the air intake pipe ...........................36
4.7 Electrical connections ........................................36
4.7.1 Control unit ............................................................37
4.7.2 Recommendations ................................................38
4.7.3 Standard control PCB ...........................................38
4.7.4 Connecting the on/off control ................................40
4.7.5 Connecting modulating controller .........................40
4.7.6 Shutdown input .....................................................40
4.7.7 Release input ........................................................41
4.7.8 System pump ........................................................41
4.7.9 PC/Laptop connection ...........................................41
4.7.10 Connection possibilities for the PCB (SCU-
S05) .......................................................................42
4.8 Electrical diagram ...............................................47
4.9 Filling the system ...............................................47
4.9.1 Water treatment ....................................................48
4.9.2 Filling the siphon ...................................................48
4.9.3 Filling the system ..................................................49
5 Commissioning ........................................................................................50
5.1 Control panel .......................................................50
5.1.1 Functions of the keys ............................................50
5.1.2 Meaning of the symbols on the display .................50
5.2 Check points before commissioning ................51
5.2.1 Preparing the boiler for commissioning .................51
5.2.2 Gas circuit .............................................................52
5.2.3 Hydraulic circuit .....................................................52
5.2.4 Connections for the air and exhaust pipes ............52
5.2.5 Electrical connections ...........................................52
5.3 Commissioning the boiler ..................................52
5.4 Gas settings ........................................................53
5.4.1 Setting the air/gas ratio (Full load) ........................54
Contents
160514 - 125467-05
2