7.2.4 Working clearances...........................................................54
7.3 Installation diagram..........................................................55
7.4 Water connections............................................................ 56
7.4.1 Unvented water connections.............................................. 56
7.4.2 Vented water connections..................................................57
7.5 Gas connection.................................................................58
7.6 Venting system................................................................ 58
7.6.1 C13/C33 concentric systems.............................................. 60
7.6.2 C13/C33 parallel systems.................................................. 62
7.6.3 C43/C53/C63 systems.......................................................64
7.7 Electrical connections........................................................ 65
7.7.1 Preparation......................................................................65
7.7.2 Mains power.................................................................... 66
7.7.3 Optional electrical connections............................................66
7.8 Commissioning.................................................................67
7.8.1 Filling..............................................................................67
7.8.2 Procedure for checking the supply pressure..........................68
7.8.3 Procedure for checking the gas control valve pressure........... 70
7.8.4 CO
2
adjustment............................................................... 71
7.8.5 Switching pressure measurement....................................... 73
7.8.6 Turn on the water heater...................................................74
7.9 Decommisioning...............................................................74
7.9.1 Turn off the water heater...................................................74
7.9.2 Draining.......................................................................... 74
8 Conversion of gas type.............................................................. 77
9 Settings.....................................................................................79
9.1 Operator interface............................................................ 79
9.2 Service program...............................................................79
9.2.1 Hysteresis....................................................................... 79
9.2.2 Display the error history.................................................... 80
9.2.3 Display the water heater history......................................... 80
9.2.4 Display the selected water heater....................................... 81
9.2.5 Switch the pump on or off................................................. 81
9.2.6 Setting the service interval................................................ 81
9.2.7 Service mode...................................................................82
9.2.8 Setting legionella prevention.............................................. 83
9.2.9 Setting the central heating configuration..............................83
10 Maintenance.............................................................................. 85
0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 11
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