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INDEX
1 GENERAL INFORMATION .................................................................................................................................. 5
1.1 SIZES AND DIMENSIONS ............................................................................................................................. 5
1.2 SEALED CHAMBER OVERALL VIEW (FF) ................................................................................................. 6
1.3 SEALED CHAMBER OVERALL VIEW (FF - SYSTEM) .............................................................................. 7
1.4 OPEN CHAMBER ASSEMBLY VIEW (CF) .................................................................................................. 8
1.5 HYDRAULIC SCHEMES ................................................................................................................................ 9
1.6 CONTROL PANEL ........................................................................................................................................ 10
1.7 DISPLAY ........................................................................................................................................................ 11
2 OPERATION .......................................................................................................................................................... 12
2.1 HEATING MODE: OPERATING LOGIC ..................................................................................................... 12
2.2 SANITARY MODE: OPERATING LOGIC ................................................................................................... 15
3 SPECIAL FUNCTIONS......................................................................................................................................... 18
3.1 FLUE CLEANER” FUNCTION......................................................................................................................... 18
3.2 “COMFORT” FUNCTION. ................................................................................................................................ 19
3.3 “ANTIFREEZE” FUNCTION ............................................................................................................................ 20
3.4 “ WATER FLOW CHECK ” ........................................................................................................................... 21
3.5 “AIR PURGE” FUNCTION ............................................................................................................................... 22
3.6 “SELF ADAPTIVE HEATING RESTART DELAY” .................................................................................... 22
4 HYDRAULIC BLOCK .......................................................................................................................................... 23
4.1 COMBI HYDRAULIC BLOCK ............................................................................................................................... 23
4.2 SYSTEM HYDRAULIC BLOCK ............................................................................................................................. 24
4.3 3-WAY VALVE .............................................................................................................................................. 25
4.3.1 Stepper motor .............................................................................................................................................. 27
4.4 SECONDARY EXCHANGER ....................................................................................................................... 29
4.4.1 Antiscale limit temperature ......................................................................................................................... 29
4.5 PUMP UNIT ................................................................................................................................................... 30
4.5.1 PUMP speed check ..................................................................................................................................... 31
4.5.2 Post-circulation. ......................................................................................................................................... 32
4.6 HEATING PRESSURE SWITCH .................................................................................................................. 33
4.7 FILLING TAP. ................................................................................................................................................ 33
4.8 DRAIN VALVE. ............................................................................................................................................. 33
4.9 BY-PASS ........................................................................................................................................................ 34
4.10 PRIMARY HEAT EXCHANGER .................................................................................................................. 35
4.11 HEATING FILTER ......................................................................................................................................... 36
4.12 EXPANSION VESSEL. .................................................................................................................................. 37
4.13 SANITARY FLOW SWITCH ........................................................................................................................ 38
4.14 TEMPERATURE PROBE .............................................................................................................................. 39
5 GAS UNIT ............................................................................................................................................................... 40
5.1 SIT 845 SIGMA GAS VALVE. ...................................................................................................................... 40
5.2 SOLENOID VALVE ELECTROPNIC CONNECTION DIAGRAM. ........................................................... 40
5.3 GAS REGULATIONS. ................................................................................................................................... 41
5.3.1 SUPPLY PRESSURE CHECK. ................................................................................................................... 41
5.3.2 MAXIMUM SANITARY POWER CHECK. ................................................................................................. 41
5.3.3 MINIMUM POWER CHECK...................................................................................................................... 42
5.3.4 SOFT IGNITION POWER CHECKING ..................................................................................................... 42
5.3.5 GAS PRESSURE/HEAT INPUT – MODELS CF. ...................................................................................... 43
5.3.6 GAS PRESSURE/HEAT INPUT – MODELS FF. ...................................................................................... 43
5.3.7 HEATING DELAY REGULATION. ............................................................................................................ 44
5.3.8 HEATING MAXIMUM POWER REGULATION. ....................................................................................... 44
5.3.9 GAS TABLE ................................................................................................................................................ 44
5.4 BURNER ........................................................................................................................................................ 46
5.5 IGNITION CYCLE. ........................................................................................................................................ 47
5.6 THE FUME DISCHARGE SYSTEM ............................................................................................................. 47
5.7 AIR PRESSURE SWITCH ............................................................................................................................. 48
5.8 FAN. ................................................................................................................................................................ 48
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