| Introduction..................................................Page 3 Dimensions.............................................................3 Technical data.................................................4 - 5 Boiler schematic....................................................6 Fixing jig..................................................................7 Domestic hot water system design.....................7 Heating system design.........................................8 Piping system installation......................................8 Boiler location........................................................9 Boiler installation.................................................. 10 Rear outlet flue installation.........................11 - 12 Top outlet flue installation.................................. 13 Electrical connection......................................... 14 Commissioning .............................................15 - 16 Safety devices..................................................... 16 Settings.................................................................. 17 Changing gas type............................................. 17 | Routine cleaning and inspection ....Page 18 - 19 Replacement of parts.................................19 - 24 Microswitch assembly......................................... 19 Fan......................................................................... 19 Air pressure switch............................................... 19 Spark generator................................................... 19 Main printed circuit board ................................. 19 Ignition printed circuit board............................. 20 Pump..................................................................... 20 Temperature/Pressure gauge............................ 20 Reversing valve assembly .................................. 20 Reversing valve front section ............................ 21 Loss of water switch ............................................ 21 Water valve or diaphragm ................................ 21 Gas valve ............................................................. 22 Modulating coil ................................................... 22 Central heating safety valve............................. 23 Heat exchanger .................................................. 23 Expansion vessel .................................................. 23 Boiler thermistor ................................................... 23 Overheat thermostat.......................................... 24 Combustion chamber insulation....................... 24 Ignition electrode................................................ 24 Flame sense electrode ....................................... 24 Burner .................................................................... 24 Burner injectors .................................................... 24 Timeclock ............................................................. 24 Schematic wiring diagram................................ 25 Fault finding...................................................26 - 27 Spare parts........................................................... 27 |