Beretta Power Plus User Manual

REFERENCE GUIDE FOR THE BOILERS

Relè interposti sui
circuiti di potenza (c

1

Se allentato
può allagare
la camera di

combustione

Tenuta dello

scambiatore

POWER PLUS

CONTENTS

CONTENTS

1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 1

1.1 GENERAL WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 1

1.2 GENERAL SAFETY MEASURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 1

1.3 GENERAL WARRANTY CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 2

1.4 BOILER IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 2

1.5 MAIN COMPONENTS IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

1.5.1 Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

1.5.2 Main heat exchanger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

1.5.3 Combustion chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

1.5.4 Flame ignition and detection electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

1.5.5 Flow and return probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 4

1.5.6 Safety thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5

1.5.7 Flue probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5

1.5.8 Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.5

1.5.9 Gas valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5

1.5.10 Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5

1.5.11 Condense collection siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 5

1.5.12 Control panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 6

1.5.13 Water differential pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 6

1.5.14 Safety valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 6

1.6 CONTROL PANELS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 7

1.7 DISPLAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 8

1.7.1 Display mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 9

1.7.2 Readout mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 9

1.7.3 Monitor mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 10

2 FIRST START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 12

2.1 PRELIMINARY OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 12

2.2 SYSTEM FILLING AND DRAIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 12

2.2.1 Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 12

2.2.2 Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 13

2.3 FIRST IGNITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 13

2.4 CHECKS DURING AND AFTER THE FIRST IGNITION . . . . . . . . . . . . . . . . . . . . . pag. 15

3 BOILER FUNCTIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16

3.1 FACTORY SETTINGS AND FUNCTIONAL PARAMETERS ADJUSTMENT . . . . pag. 16

3.2 CENTRAL HEATING PARAMETERS SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16

3.2.1 Setpoint_T_CH_High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 16

3.2.2 Setpoint_T_CH_Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.2.3 CH_Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.3 DOMESTIC HOT WATER PARAMETERS SETTING . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.3.1 Setpoint_DHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.3.2 DHW_Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.3.3 DHW_Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

I

CONTENTS

3.4 MAIN FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

3.4.1 Domestic Hot Water Priority function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 17

3.4.2 Anti-frost function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 17

3.4.3 Dispersion function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 18

3.4.4 Cascade management function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 18

3.4.5 Switch ON/OFF management function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 18

3.4.6 Emergency function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 18

3.5 PARAMETERS SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 19

3.5.1 Password setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 19

3.5.2 Parameters list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 19

3.6 SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 23

3.6.1 Maximum power CO2 setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 23

3.6.2 Minimum power CO2 setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 24

3.6.3 Adjustments verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 24

3.7 GAS CONVERSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 24

3.8 BURNER PRESSURES SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 25

3.8.1 Gas supply pressure check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 25

3.9 COMBUSTION CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 26

3.10 FAN SPEEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 26

3.11 THERMOREGULATION SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 26

3.11.1 Central heating high temperature circuit functioning. . . . . . . . . . . . . . . . . . . . pag. 26

3.11.2 Attenuation_High . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 26

3.11.3 Central heating low temperature circuit functioning . . . . . . . . . . . . . . . . . . . . pag. 27

3.11.4 Attenuation_Low . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 27

3.11.5 T_out_correct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 28

3.11.6 T4_frost_protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 28

3.11.7 Power_control_mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 29

3.11.8 Slave PCBs safety functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 30

3.11.9 Mix valve management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 30

3.11.10 Gas type (fan speeds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 30

3.11.11 Burner ignition procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 31

3.11.12 Factory settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 31

3.12 ADDRESSES SETTINGS FOR CASCADE CONNECTIONS. . . . . . . . . . . . . . . . . . . . pag. 31

3.12.1 Master PCB data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 31

3.12.2 Slave PCBs data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 32

3.12.3 Slave PCB user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 32

3.12.4 Slave PCBs access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 32

3.12.5 Addresses settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 32

4 BOILER SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 34

4.1 TEMPORARY SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 34

4.2 EXTENDED PERIODS SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 34

5 MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 35

5.1 ORDINARY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 35

5.2 EXTRAORDINARY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 35

5.3 PERIODICAL PROGRAMMED MAINTENANCE TABLE . . . . . . . . . . . . . . . . . . . . .pag. 36

5.4 NECESSARY TOOLS FOR MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 36

5.5 SAFETY RULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 36

II

CONTENTS

5.6 COMPONENTS ACCESSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 36

5.6.1 Casing disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 37

5.6.2 Control panel disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 38

5.6.3 PCBs disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 39

5.6.4 Ignition electrode disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 40

5.6.5 Venturi disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 41

5.6.6 Fan disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 42

5.6.7 Burner disassembly and combustion chamber cleaninge . . . . . . . . . . . . . . . . . . pag. 43

5.6.8 Siphon disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 44

5.6.9 NTC probes disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 45

5.6.10 Safety thermostat disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 46

5.6.11 Flue probe disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 47

5.6.12 Gas valve disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 48

5.6.13 Water differential pressure switch disassembly . . . . . . . . . . . . . . . . . . . . . . . . . pag. 49

6 FAULT FINDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 50

6.1 ERROR MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 50

6.2 PERMANENT LOCKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 50

6.3 LOCKOUTS CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 50

6.3.1 Master PCB lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 50

6.3.2 Slave PCB lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 51

6.4 EVENTUAL ANOMALIES AND REMEDIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 52

7 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 54

7.1 HANDLING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 54

7.2 BOILER INSTALLATION ROOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 54

7.3 INSTALLATION ON OLD SYSTEMS OR SYSTEMS TO BE UPGRADED. . . . . . . pag. 54

7.4 FITTING THE BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 54

7.5 HYDRAULIC CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 55

7.5.1 Hydraulic kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 55

7.6 FUEL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 61

7.7 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 61

7.7.1 Master control panel internal connection block . . . . . . . . . . . . . . . . . . . . . . . pag. 62

7.8 SYSTEMS FILLING AND DRAINING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 62

7.8.1 Filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 62

7.8.2 Draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 63

7.9 FLUE DRAIN AND COMBURENT AIR INTAKE . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 63

7.9.1 Ducts maximum length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 63

7.9.2 Condense drain arrangement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 64

7.9.3 Kit flue collector with clapet valves (FIG. 7.11). . . . . . . . . . . . . . . . . . . . . . . pag. 65

7.10 OUTDOOR PROBE CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 65

7.10.1 Outdoor probe wall fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 65

III

CONTENTS

APPENDIX A - Main components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 68

APPENDIX B - Dimensions and weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 69

APPENDIX C - Technical data table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 70

APPENDIX D - Hydraulic circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 71

D.1 Water side head losses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 71

APPENDIX E - NTC probes positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 72

APPENDIX F - Pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 73

F.1 Configuration with distribution pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 73

F.2 Configuration with injection pumps (accessory cod. 1102419) . . . . . . . . . . . . . . . . . . . . pag. 73

F.3 Configuration with ring pump and valves on the units . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 74

F.4 Configuration with mixed system and solar system with double-coil storage tank . . . . .pag. 74

F.5 Pumps performance graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag. 75

APPENDIX G - Electrical schemes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 76

G.1 Power Plus 50 M – 100 M (master board code R105920) . . . . . . . . . . . . . . . . . . . . . . . . pag. 76

G.2 Power Plus 50 M - 100 M (master board code R107584). . . . . . . . . . . . . . . . . . . . . . . . .pag. 78

G.3 Power Plus 100 S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 80

APPENDIX H - Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 82

H.1 Outdoor probe connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag.83

H.2 External 0-10 V thermoregulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 83

H.3 Connection of an external alarm device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 83

H.4 Remote control kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 84

APPENDIX I - Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 93

IV

1 GENERAL

GENERAL

1.1 GENERAL WARNINGS

The boilers produced in our factory are built with



care down to the last component to protect both the
user and installer from eventual accidents. We there­fore recommend qualified personnel that after work­ing on the product they should pay particular
attention to the wiring, especially the bare wires, that
must not be exposed outside the terminal board for
any reason to prevent any contact with the live parts
of the wiring.

This instructions manual is integral parts of the



product. Make sure they remain with the boiler, even
if it is transferred to another owner or user or moved
to another heating system. In case of loss or damage,
please contact your local Technical Assistance Ser­vice for a new copy.

This boiler may only be installed and serviced by



qualified personnel who satisfy the requirements of
local rules. Work must be done in compliance with
regulations in force and subsequent updates.

The boiler must be serviced at least once a year. This



should be booked in advance with the Technical
Assistance Service.

The installer shall instruct the user in the operation



of the boiler and the safety devices.

This boiler may only be used for what it was



expressly built to do. The manufacturer declines all
contractual and non-contractual liability for injury
to persons or animals or damage to property deriving
from errors made during installation, adjustment
and servicing and from improper use.

This appliance is used to produce hot water and must



therefore be connected to a heating and/or a domestic
hot water system, according to its performance and
power.

After removing the packaging, make sure the con-



tents are undamaged and complete. If this is not the
case, contact your dealer.

The safety valve outlet must be connected to a suit-



able collection and venting system. The manufac­turer declines all liability for any damage caused by
the safety valve.

The safety and automatic adjustment devices on the



appliance must never be modified during its lifetime,
except by the manufacturer or dealer.

Should the appliance develop any faults and/or work



badly, switch it off and do not attempt to repair it
yourself.

Immediately after installation, inform the user that:



- in the event of leaks, he/she must shut off the water
supply and promptly inform the Technical Assis­tance Service;

- he/she must make regular checks to verify that the
operating pressure of the system ranges between 1
and 1,5 bar, and must never be greater than 3 bar.
If necessary he/she must call in professionally qual­ified personnel from the Technical Assistance Ser­vice;

- if the boiler is not planned to be used for a long
period, he/she should call in the Technical Assis­tance Service to perform the following operations:

- turn off the boiler and system main switches;

- close the gas and water taps on the heating cir-

cuit;

- drain the heating circuit to prevent freezing.

Connect the outlet collector to a suitable outlet sys-



tem.

1.2 GENERAL SAFETY MEASURES

The use of products that operate on fuel, electricity and water
requires a number of fundamental safety rules to be observed,
including.

( The boiler must not be used by children or invalid per-

sons without supervision.

( Electrical devices or appliances, such as switches,

household appliances, etc. must not be used if there is
the smell of gas or unburned fuel. In this case:

- ventilate the room by opening doors and windows;

- close the fuel stoptap;

- promptly contact Technical Assistance Service, your
gas supplier or other professionally qualified per­sonDo not touch the boiler when barefoot or with wet
parts of the body.

- No service or cleaning operations may be performed
without first having disconnected the boiler from the
mains power supply, moving the main system switch
to “OFF”.

- The safety or control devices must not be adjusted
without the authorisation and written instructions from
the manufacturer of the boiler.

- The condensate drain must not be plugged.

- Do not pull, remove or twist the electrical cables com­ing out of the boiler, even if the appliance is discon­nected from the mains power supply.

- The ventilation openings in the room where the appli­ance is installed must not be plugged or reduced in
size and must comply with any current standards and
law applicable.

- Do not expose the boiler to the elements. It is not
designed to operate outdoors and does not have suffi­cient frost protection systems.

- Do not switch the boiler off if the outside temperature
may fall below ZERO (risk of freezing).

1

GENERAL

- Do not leave containers and flammable substances in
the room where the boiler is installed.

- The packaging material must not be dispersed in the
environment or left within the reach of children as it is
a potential source of hazard. It must be disposed of
according to the legislation in force.

1.3 GENERAL WARRANTY CONDITIONS

The warranty covers all the parts of the products. It is intended
as a free of charge repair and eventual free of charge
changeover of every part that should, in the manufacturer
judgement, any manufacturing defect.

The first ignition of the product must be carried out by autho­rised technical personnel, which will then redact an ignition
report, that must be signed also by the customer.

The warranty becomes invalid if:

- the cause of the malfunctioning is external to the product;

- not original components, spare parts, tear and wear materi­als have been used;

- the repairing or maintenance interventions have been carried
out by not authorised personnel;

- the environmental or installation conditions differ from
what reported in S

The warranty does not cover parts subject to normal tear and
wear, such as: filters, gaskets, handles, etc.

ECT.7, PAGE 54.

1.4 BOILER IDENTIFICATION

The boilers can be easily identified by:

- Packaging label (F

This shows the code, the serial number and the barcode.

IG. 1.1)

Fig. 1.1

2

1

2

GENERAL

- Rating plate (FIG. 1.2)

This shows the technical and performance specifications.

100 M
100 M

100 M DEP

models

100 S

100 S DEP

models

- Gas label (FIG. 1.3)

This is applied on the side of the frame, and describes the
type of fuel used by the boiler, and the country of destina­tion.

Paese di destinazione:

ITALIA

Tipo di apparecchio
Caldaia categoria::

Regolazione effettuata dal costruttore:

Leggere attentamente il libretto istruzioni
prima di installare e mettere in servizio
l'apparecchio.

(Later

B23, C63

II2H3+

Pressioni di alimentazione gas:

G20

20 mbar

G30+G31

28-30/37 mbar

G20 - 20 mbar - 2H METANO

ale DX)

ATTENZIONE

068120_1_E0

Fig. 1.3

If the plates or other means for clearly identifying the



product have been tampered with, removed or are
missing, the installation and servicing operations will
be much more difficult.

Fig. 1.2

Boiler regulated for:

G31 37 mbar

Destination Country:

IT

TXXXXXXXX

1.5 MAIN COMPONENTS
IDENTIFICATION

To identify the position of the described components, please
refer to the exploded diagrams reported in APPENDIX A -

PAGE 68.

For the disassembly operations, please refer to S

PAGE 35.

1.5.1 Burner

The burner (F

IG. 1.4) is completely premix, micro-flame, with

very low polluting emissions. It is inserted inside the heat ex­changer to which it is mechanically assembled underneath the
fan group, by means of 4 screws.

1.5.2 Main heat exchanger

The main heat exchanger (F

IG. 1.5) is constituted by a wrin-

kled bi-metallic coil, whose external surface is made of stain­less steel AISI 316L (flue side), while the inner surface is
made in copper (water side). It doesn’t need any specific main­tenance operation.

1.5.3 Combustion chamber

The combustion chamber (F

IG. 1.6) has a cylindrical shape

with aluminium made headers. According to the boiler power
1 (50 kW models) or 2 (100 kW models) units are used.

ECT.5,

1.5.4 Flame ignition and detection electrode

The electrode (F
tion chamber (S

IG. 1.7) is on the left-top part of the combus-

ECT. 1.5.3, PAGE 3) and its function is to pro-

duce an high voltage spark in the proximity of the burner
(S

ECT. 1.5.1, PAGE 3) and to detect when the flame is present.

3

GENERAL

Fig. 1.4

Burner

Fig. 1.6

Electrode

Fig. 1.5

1.5.5 Flow and return probes

The flow and return probes (F

IG. 1.8) are of NTC type and are

placed the first in the flow pipe closed to the automatic venting
device, while the second one is in the lower part of the return
pipe, closed to the draining tap. The probes allow the PCB to
read the temperature on the return and flow of the combustion
unit.

Fig. 1.7

Flow NTC

probe

Return NTC

probe

Fig. 1.8

4

GENERAL

1.5.6 Safety thermostat

The safety thermostat (F

IG. 1.9) is manually resettable, is

placed in the upper part of the flow pipe and intervenes if the
flow temperature is above 90°C, shutting down the burner.

Safety

Thermostat

Fig. 1.9

1.5.7 Flue probe

The flue probe (F

IG. 1.10) is placed in the lower part of the

heat exchanger, intervening whenever the drained flue temper­ature rises above 80°C.

1.5.9 Gas valve

The gas valve (F

IG. 1.12) is placed in the upper part of the

combustion chamber, is connected to the venturi and is the
component that manages and checks the gas flow to the burn­er. The valve is made by an aluminium die-cast part with two
safety electrical valves, which are mechanically in series, but
electrically in parallel. This configuration guarantees that, in
every anomalous situation, the gas supply to the burner is in­terrupted in the shortest time. Removing the venturi from the
gas valve by its screws, it possible to gain accessibility to the
gas flow hole and its gasket (in case of gas supply being nat-
ural gas no injector is present).

Fig. 1.12

1.5.10 Venturi

The venturi (F

IG. 1.13) is a body made of die-cast aluminium

through which the air-gas mixture is convoyed towards the fan
and hence inside the combustion chamber.

Flue probe

Fig. 1.10

1.5.8 Fan

The fan (F

IG. 1.11) is placed in the upper part of the combus-

tion chamber and is fastened by means of screws-nuts to the
venturi (air-gas mixer) and to the body of the combustion
chamber, in which the burner is. It is used to push the air-gas
mixture towards the burner and to push the combustion prod­ucts towards the flue drain collector.

Fig. 1.11

Venturi

Fig. 1.13

1.5.11 Condense collection siphon

The siphon (F

IG. 1.14) is made of composite material, is

placed in the right-bottom part of the combustion chamber, has
the function to collect and drain the condense generated by the
thermal exchange between the combustion products and the
primary water circuit, maintaining the combustion circuit sep­arated from the condense drain circuit. Inside the siphon there
is a float that keeps separated the two described circuits even
in the case no water is present in the siphon body.

Fig. 1.14

5

GENERAL

1.5.12 Control panel

The control panel (F

IG. 1.15) of the models Power Plus 50 M

– 100 M – 100 M DEP contains a master PCB and one or two
slave PCBs, according to the boiler power. The models 100 S
and 100 S DEP contain only the two slave PCBs. In the case
of cascading connection among different thermal groups, the
master PCB of the thermal unit Power plus 50 M – 100 M –
100 M DEP is able to manage via a BUS connection all the
PCBs of the units Power Plus 100 S and 100 S DEP. The man­agement is based on a microprocessor and the self-diagnosis is
displayed by a combination of LED and display alphanumeric
digits. It is possible to cascade up to 60 thermal units managed
by the Master version thermal group with sequence rotation
and cascade strategy selection. Thanks to the versatility of the
PCB it is possible to make a very quick connection to every
kind of system for the production of hot water for the central
heating or domestic water purposes with storage tank manag­ing, in the same time, up to three circuits working at a different
temperature.

Master PCB

Slave PCB

Slave PCB

Fig. 1.16

Fig. 1.15

1.5.13 Water differential pressure switch

The water differential pressure switch (F

IG. 1.16) is placed in

the bottom part of the thermal unit and it has the function to
check and grant a minimum flow rate of at least 500 l/h for
each thermal unit.

The boiler is brought in a safety lock-out condition whenever
the water is not present, shutting down and keeping off the
burner.

The intervention thresholds are:

- ON with system flow rate > 700/720 l/h (∆p 50/55 mbar)

- OFF with system flow rate < 540/560 l/h (∆p 35/40 mbar).

1.5.14 Safety valve

The safety valve (F

IG. 1.17) is placed on the flow pipe and is

connected to a drain pipe.

It has the task of protecting the hydraulic circuit from eventual
over-pressures consequent, for instance, to the primary fluid
volume increase caused by its heating. The valve is adjusted to
intervene at a value of 5.5 bar.

Fig. 1.17

6

1.6 CONTROL PANELS

Power Plus 50 M

1235768109

4

GENERAL

15 1612 13 14

Power Plus 100 M

1

4

23 5 7681091 1

1 - FIRST heating unit switch
2 - Button for selecting the operating mode
3 - Reset button (Master)
4 - Electrical supply presence signal
5 - Boiler lockout signal
6 - Button for selecting the parameters
7 - Display
8 - Save button
9 - Button to increase values
10 - Button to decrease values
11 - SECOND heating unit switch
12 - Slave power supply signal:

slow flashing = stand-by
rapid flashing = ignition cycle

solid light = flame detected
13 - Slave lockout signal
14 - Reset button (Slave)
15 - Instruments panel

12

131415 1612 13 14

16 - Main boiler switch

Power Plus 100 S

1

1211131415 1612 13 14

7

GENERAL

1.7 DISPLAY

The buttons on the Beretta POWER PLUS control panel have different functions in different modes. For example, the combina­tion of two buttons corresponds to one specific function. Alternatively, a function can be activated by pressing the button briefly
or by holding it for around 5 seconds.

Red LED

This switches on only in case of anomalies that

imply the permanent lockout of a thermal unit (re-

settable only by pressing the Master or Slave Re-

set button).

7-digits display

RESET

This resets the electronic board

after a permanent lockout.

+ and -

These increase or decrease a cer-

tain value.

Set/esc

This is used to enter parameter

setting mode and monitor mode

on the individual units.

8

OK

This is used to save the new values.

This is used to display the oper-

ating status of the various cir-

cuits managed by the Master

board.

GENERAL

1.7.1 Display mode

The red LED comes on in the event of faults that cause the permanent lockout of a heating unit (normal operation is reset only
by pressing the Master or Slave reset button).

The 3 digits with seven segments display the status of the system:

Status of the system Display

No central heating or DHW demand.
(The two digits on the right display the flow temperature T1. E.g.: T1 = 30°C)

Demand from circuit no.1 or from circuits 1 and 2 together.
The two digits on the right display the flow temperature T1. E.g.: T1 = 80°C.

Demand from the DHW circuit or simultaneous operation.
The two digits on the right display the flow temperature T1 E.g.: T1 = 80°C.
The decimal point after the 1st digit on the left flashes.

Demand from the 2nd circuit
The two digits on the right display the flow temperature T1. E.g. T1 = 80°C.

Anti-frost function.

No request of CH or DHW.
(the two digits in the right display the flow temperature T1. E.g. T1 = 30°C)

1.7.2 Readout mode

(T

EMPERATURE VALUES AND OPERATING STATUS OF THE VARIOUS CIRCUITS)

Press the button to scroll forwards and display the values set for the individual circuits.
The values listed below will be displayed in sequence when pressing the button.

Value displayed Display

Flow temperature T1 in the high temperature circuit.

1

E.g.: T1 = 80°C.

DHW temperature T3.

2

E.g.: storage heater temperature = 50°C.

Outdoor sensor temperature T4.

3

E.g.: T4 = 7°C.

4 Flow temperature in 2nd circuit or low temperature circuit T6.

Room thermostat in the 1st circuit, closed or open.

5

OFF = contact open.
ON = contact closed.

Room thermostat in the 2nd circuit, closed or open.

6

OFF = contact open.
ON = contact closed.

0-10 V analogue input.

7

E.g.: 5.5 V, 10 V.

Operating status of the mixing valve.

8

E.g.: closing, opening, standby.

9

GENERAL

Value displayed Display

Operating status of the main pump.

9

E.g.: pump not working, pump working.

Operating status of the DHW pump.

10

E.g.: pump not working, pump working.

Operating status of the secondary pump.

11

E.g.: pump not working, pump working.

To exit the display of the values, press the “OK” button. If no operation is performed for 5 minutes, the PCB automatically returns
to Display mode.

1.7.3 Monitor mode

From the Readout mode, press “Set/Esc” for 5 seconds to access “Monitor” mode. This mode is used to check the operating
values of each individual unit in the system (addresses from 1 to 60).

Operation Display

1 The boiler is operating with the high temperature circuit at 80°C.

Press “Set/Esc” for 5 seconds.

2

The display indicates that the values and the operating status of unit 1 can be read.

3 Press “+” or “-” to scroll and read the values for the desired unit.

Pressing the display shows the 1st value for the selected unit.

4

Pressing the button again displays the following values.
E.g.: outlet temperature 70°C.

To exit Monitor mode, press “MODE”.

5

If within 5 minutes no button is pressed or no operation is performed, Display mode resumes.

Press to display the following values for the individual unit:

Value Display

1 Flow temperature E.g.: 70°C.

2 Return temperature E.g.: 50°C.

3 Flue gas temperature E.g.: 60°C.

Ionisation current (index from 0 to 99).

4

E.g.: ionisation current index 44.

Fan PWM signal (%).

5

If PWM = 100%, this corresponds to 99 on the display.
E.g.: 66 %.

10

Flow switch open/closed (not active).

6

E.g.: contact open.

Pump or motorised valve on the individual unit on/off.

7

E.g.: Pump ON.
E.g.: Pump OFF.

GENERAL

Value Display

Maximum ionisation current (range from 0 to 99) at first attempt.

8

E.g.: maximum ionisation current 80.

Hours of unit functioning (from 0 to 9999 hours).

9

E.g.: 8050 hours: the display reads out paired figures showing the hours in a sequence of thousands,
hundreds, tens and units.

11

FIRST START-UP

2 FIRST START-UP

2.1 PRELIMINARY OPERATIONS

Before starting the system and running the functional tests on
the Beretta POWER PLUS boiler, check that:

- The fuel valve and valves in the central heating system are
open.

- The type of gas and the supply pressure are correct for the
boiler.

Fig. 2.1

- The system is filled, i.e. the pressure in the water circuit,
when cold, is around 1.5 bar and the circuit has been vented.

2.2.1 Filling

- Open the valves (1 - F
fittings.

ILLUSTRATIVE SCHEME

Fig. 2.4

- Open the caps on the automatic vent valve/valves (2 - F

2.5) by two or three turns.

IG. 2.4) installed on the boiler water

1

MI

RI

GAS

2

IG.

Fig. 2.2

- The system expansion vessel is suitably pre-charged.

- The electrical connections have been performed correctly.

The pumps should be connected by installing suitable



contactors with manual emergency operation.

- Check that the cap on the vent valve/valves is unscrewed.

- The pumps turn freely: loosen the inspection screw and
check with a flathead screwdriver that the motor shaft is ro­tating without impediments.

Fig. 2.3

Before loosening or removing the seal cap on the



pump, protect the electrical devices underneath
against water spillage.

- The flues have been properly made and installed.

2.2 SYSTEM FILLING AND DRAIN

The Beretta POWER PLUS Boiler is not fitted with a filling
valve, which must be installed on the system return.

Fig. 2.5

- If present, open the two-ways valve of each thermal engine,
setting the lever (3 - F
This lever is placed underneath the two-ways valve.

Fig. 2.6

- Open the filling valve on the system until the pressure
shown on the pressure gauge is 1,5 bar.

- Close the filling valve again.

- Bring back the two-ways valve lever (3 - F
thermal unit to its position “AUTOMATIC”.

IG. 2.6) in its position “MANUAL”.

3

AU

TO

MAN

IG. 2.6) of each

12

The air is vented from the POWER PLUS boiler



automatically through the automatic vent valve/
valves installed on the top of the heating units. Check
that the cap on the valve is open.

2.2.2 Drain

Before starting to empty the system, disconnect the power sup­ply by moving the main system switch to “OFF” (F

IG. 2.7).

FIRST START-UP

1

5

MI

RI

GAS

Fig. 2.7

Emptying the BOILER

- Close the valves (1 - F
fittings.

ILLUSTRATIVE SCHEME

ON

OFF

IG. 2.8) installed on the boiler water

1

MI

RI

GAS

ILLUSTRATIVE SCHEME

Fig. 2.10

setting the lever (3 - F

IG. 2.11) in its position “MANUAL”.

This lever is placed underneath the two-ways valve.

3

AU

TO

MAN

Fig. 2.11

- Once the system has been drained bring back the two-ways
valve lever (3 - F

IG. 2.11) of each thermal unit to its position

“AUTOMATIC”.

Fig. 2.8

- Connect a plastic hose to the drain tap (4 - F

IG. 2.9), on each

heating unit, and open the tap.

4

Fig. 2.9

Before opening the drain tap (4 - FIG. 2.9) protect the



electrical devices underneath against water spillage.

Emptying the SYSTEM

- Check that the valves (1 - F

IG. 2.10), installed on the water

circuit, are open.

- Connect a plastic hose to the drain tap (5 - F

IG. 2.10), fitted

on the system return line, and open the tap.

- If present, open the two-ways valve of each thermal engine,

2.3 FIRST IGNITION

- Move the main system switch to “ON” (FIG. 2.12).

ON

OFF

Fig. 2.12

- Move the boiler main switch (1 - F
(2 - F

IG. 2.13) on each heating unit to “ON”. The green

SLAVE power supply signal (3 and 4 - F
boiler performs a self-diagnosis cycle, after which it will en­ter DISPLAY mode. The display (5 - F
status of the system and the temperature measured by the
probe in the “high temperature” circuit. If there are more
than two boilers installed, it is necessary to configure the ad­dresses from the third thermal unit on. To do this, see

S

ECT. 3.12, PAGE 31 - “ADDRESSES SETTINGS FOR CAS-

CADE CONNECTIONS”.

- Set the room thermostats in the high and low temperature
zone to the desired temperature (20°C) or if the systems are
fitted with a timer-thermostat or timer, check that this is on
and set (20°C).

- Press the : button: the maximum temperature of the boiler

IG. 2.13) and the switches

IG. 2.13) flash. The

IG. 2.13) shows the

13

FIRST START-UP

25 2

3

14

Fig. 2.13

will be displayed, that is, the maximum temperature in the
high temperature circuit, preceded by the symbol “1” (F

IG.

2.14).

Fig. 2.14

- Press “Set/Esc”: the corresponding set point will be dis­played and the two digits on the right will flash. To change
the value, press “+” or “-”. To confirm press “OK” (F

IG.

2.15).

-Press “Set/Esc”: the correspondent set point will be dis-
played and the two digits on the right will flash. To change
the value, press “+” or “-”. To confirm press “OK” (F

IG.

2.17).

Fig. 2.17

For low temperature systems, select a temperature



between 20°C and 45°C. When setting the system as
“Low temperature” type, the maximum flow temper­ature will be automatically limited at 50°C (Parame­ter 23=T_CH_Low_limit).

Changing the flow temperature implies a modifica-



tion of the climatic control curve (see S

PAGE 26). These settings must only be performed by

ECT.3.11,

the Technical Assistance personnel or a suitably qual­ified person.

If the boiler is connected to a storage tank, set parameter 6
(pre-set to 0=no DHW service). To do this, access the “Install­er programming” mode and set parameter 6 to:

- 2 = for storage heater with probe.

- 6 = for storage heater with thermostat.

In addition, set parameter 9 (DHW_Priority) to 2 for absolute
priority. If the storage tank is fitted with an NTC probe, the de­sired temperature can be set on the display, from 10°C to
50°C. If the storage tank is fitted with a thermostat, the desired
temperature should be set directly on the storage heater, while
the parameter 3 must be left at 50°C.

- Press button twice: the DHW temperature will be dis­played, preceded by the symbol “3” (F

IG. 2.18).

Fig. 2.15

- Press the button four times: the maximum temperature in
the low temperature circuit will be displayed, preceded by
the symbol “6” (F

IG. 2.16).

Fig. 2.16

14

Fig. 2.18

-Press “Set/Esc”: the corresponding set point will be dis-
played and the two digits on the right will flash. To change
the value, press “+” or “-”. To confirm press “OK” (F

IG.

2.19). The boiler will start in DHW mode, until the demand

is satisfied.

- When the boiler is in Standby, the display on the Master unit
is in Readout mode and the three digits show the number
“1”, followed by the value of the flow temperature. The

Fig. 2.19

green LED (Ref. 11, SECT. 1.6, PAGE 7) flashes.

FIRST START-UP

set correctly:

2 = storage tank with probe

6 = storage tank with thermostat

and check that its operation is correct, by opening a hot wa­ter tap.

- Check the complete shutdown of the thermal unit by moving
the main system switch to “OFF”.

- Generate an heat request operating on the Room Thermostat
or on the Time Programmer (external).

- Verify, if a storage tank is present, the DHW operation by
opening a hot water tap.

- Check the complete shutdown of the thermal unit by moving
the main system switch to “OFF”.

ON

OFF

Fig. 2.22

Fig. 2.20

- If ignition or operating faults occur on any heating unit, the
display on the Master boiler starts flashing and the red LED
(4) comes on.

Fig. 2.21

There are two possible types of errors:

- Type A errors, which can only be deactivated by pressing
the RESET button.

- Type E errors, which are deactivated when the causes are no
longer present (see S

PAGE 50).

ECT. 6.1, PAGE 50 and SECT.6.3,

After a few minutes of continuous operation controlled by the
room thermostat, the adhesives and the processing residues
will have evaporated, and the following checks can be com­pleted:

- gas supply pressure check;

- combustion check.

2.4 CHECKS DURING AND AFTER THE

FIRST IGNITION

When ignition is complete, check that the Beretta POWER
PLUS boiler correctly:

- Starts and stops, closing the contacts on the zone thermo­stats.

- Displays the DHW temperature (only if the storage tank is
fitted) and central heating temperature, pressing the but­ton twice.
Check, if the storage heater is fitted, that parameter “6” is

15

BOILER FUNCTIONING

T_out_max

Outdoor Temperature (°C)

Flow temperature (°C)

CLIMATIC CURVE

HIGH TEMPERATURE Circuit

T_CH_High

maximum
heat need

T_CH_High_foot

T_out_min

25 20 15 10 5 0 -5 -10 -15 -20

0

10

20

30

40

50

60

70

80

90

100

3 BOILER FUNCTIONING

3.1 FACTORY SETTINGS AND
FUNCTIONAL PARAMETERS
ADJUSTMENT

Each Master PCB for each thermal group Power Plus 50 M ­100 M - 100 M DEP needs to be configured according to the
system characteristics. The factory settings allow to manage
the kind of system described hereafter. In case of different
kind of systems, modify the following parameters during the
boiler installation:

- Mixed system with 2 circuit (one high temperature, one low

temperature) with thermoregulation managed by the out­door probe (Par. 14 = 1).

- Configuration with “ring” system pump modulating on the

primary circuit (Par. 34 = 0).

- No DHW functioning (Par. 6 = 0).

- No priority between high and low temperature circuit (Par.

16 = 0)

- Maximum temperature on the high temperature circuit 70°C

(Parameter 1 user) and 40°C (Parameter 3 user) on the low
temperature one.

- Functioning with Natural gas with flues running for less

than 15 metres (Par. 31 = 1).

The functions of the central heating high temperature and low
temperature circuits and the DHW circuits can be set based on
the system requirements, by setting the functional parameters.

The first three parameters are accessible at a user level, while
the remaining parameters require the password to be entered
(“22”, vedi S
ters, press the button, after which the following values will
be displayed:.

Flow temperature in the high temperature
circuit T1

Temperature in the circuit T3

Flow temperature in the low temperature
circuit T6

To change the corresponding set points:

- Press “Set/Esc”, the corresponding value will be displayed

and the two digits on the right will flash.

- Press “+/-” until reaching the desired value. Press “OK” to

save the new value. The value displayed will stop flashing
and will be valid after 3 seconds.

EXAMPLE

Changing the low temperature Set-point from 50°c to 40°C.

ECT. 3.5.1, PAGE 19). To access the user parame-

Procedure Display

3 Press “Set/Esc”.

Press “-” to bring the set-point to the

4

intended value of 40°C.

Press “OK” to store in the memory

5

the new value.

After 3 seconds it will turn back to the Display mode with

6

the new set value.

If after having pressed

“Set/Esc” no operation is done for 10

seconds, (because the desired value corresponds to the set one)
the PCB will go back to the functioning in Display mode. If af­ter having pressed “+” or “-” no button is pressed for the next
minute, the PCB will go back to Display mode. Should this
happen no value will be stored in memory.

3.2 CENTRAL HEATING PARAMETERS
SETTING

The following functions can be set for the CH functioning.

3.2.1 Setpoint_T_CH_High

Set-point in the high temperature circuit (parameter 1)

If the operating mode is set to “fixed set point” (par.
14=CH_type_high=0), this is the objective temperature. If in­stead the outdoor temperature probe is used, i.e. the operating
mode is set to “climate control” (par. 14= CH_type_high =1),
this is the maximum objective temperature correspondent to
the minimum outside temperature (T_out_min=par. 37, pre­set to 0°C). (Picture 3.1) Parameter 18 (T_CH_high_foot, pre­set to 50°C) defines the minimum set point correspondent to
the maximum outside temperature (T_out_max, pre-set to
18°C). Pre-set to 70°C with upper limit set by par. 17

(T_CH_high_limit, pre-set to 80°C).

Procedure Display

Read value on the display for the high

1

temperature circuit 80°C.

Press to access the Readout mode,
press again until “6” appears on the

2

first digit to visualise the set value of
50°C.

16

Fig. 3.1

BOILER FUNCTIONING

3.2.2 Setpoint_T_CH_Low

Set point in the low temperature circuit (parameter 3)

If the operating mode is set to “fixed set point” (par.
22=CH_type_low=0), this is the objective temperature. If in­stead the outdoor temperature probe is used, i.e. the operating
mode is set to “climate control” (par. 22=CH_type_low =1),
this is the maximum objective temperature correspondent to
the minimum outside temperature (T_out_min=par. 37, pre­set to 0°C). Parameter 24 (T_CH_low_foot, pre-set to 25°C)
defines the minimum set point for the maximum outside tem­perature (T_out_max, pre-set to 18°C). Pre-set to 40°C with

upper limit set by par. 23 (T_CH_Low_limit, pre-set to
50°C).

CLIMATIC CURVE

100

90

80

70

T_CH_Low_foot

60

50

40

30

Flow temperature (°C)

20

10

0

25 20 15 10 5 0 -5 -10 -15 -20

LOW TEMPERATURE Circuit

maximum

T_out_min

T_out_max

Outdoor Temperature (°C)

heat need

T_CH_Low

Fig. 3.2

3.2.3 CH_Priority

Central heating priority (parameter 16)

If this is set to 0 the system works without central heating pri­ority, that is, with the high temperature and low temperature
circuit served in parallel. If set to 1, the demand from the low
temperature circuit is ignored and the corresponding pump re­mains off. The demand from the low temperature circuit is
only accepted when the high temperature circuit demand is ab­sent. Vice-versa, if set to 2 the low temperature circuit has pri­ority. Pre-set to 0.

REMARK: If a priority is selected, it will be necessary to use
the system with thermostatic setting.

The Master can be in different operative conditions, represent­ed by the flow diagram in F

IG. 3.3.

The diagram has been drawn with absolute DHW priority
(Dhw_Priority Par.9 = 2) and without any CH priority
(Ch_Priority Par. 16 = 0) and works with High temperature
and Low Temperature circuits working in parallel.

With CH Priority on the High Temperature circuit
(Ch_Priority Par.16 = 1), the High Temperature circuit is ac­tive whenever TA_H = 1 and DHW = 0. Under this condition
the Low Temperature circuit is not active.

With CH Priority on the Low Temperature circuit
(Ch_Priority Par.16 = 2), the Low Temperature circuit is ac­tive whenever TA_L = 1 and DHW = 0. Under this condition
the High Temperature circuit is not active.

3.3 DOMESTIC HOT WATER

PARAMETERS SETTING

The following functions can be set for the domestic hot water
circuit.

3.3.1 Setpoint_DHW

Domestic hot water set point (parameter 2)

This is the temperature value for the production of domestic
hot water. The maximum limit is set by par. 8 (T_DHW_limit,
pre-set to 60°C). Pre-set to 50°C.

3.3.2 DHW_Type

Type of storage tank (parameter 6)

- 0 = No DHW service

- 1 = Rapid heat exchanger with probe

- 2 = Storage tank with probe

- 6 = Storage tank with thermostat

For the storage tank with thermostat, if the input is a closed
contact, the domestic hot water demand is activated, if it is an
open contact the demand is not active. Pre-set to 0.

3.3.3 DHW_Priority

Domestic hot water priority (parameter 9)

- 0 = Sliding priority A

The purpose of the sliding priority A function is to allow the
system to also serve the central heating function when the
heating demand is low. The system reacts to the heating de­mand if:

(Setpoint_Ch - 50°C) < Manifold temp. < (Setpoint_Ch +
1°C)

Setpoint_Ch = Set point in the high or low temperature cir­cuit, according to the request.

- 1 = Sliding priority B

The purpose of the sliding priority B function is to ensure
that the system does not stop the central heating service for
a too long time.

The system reacts to the heating request if:

(Setpoint_Dhw+T_Tank_extra) - 50°C < Manifold temp. <
(Setpoint_Dhw+T_Tank_extra) + 1°C

T_tank_extra = Par. 10 = pre-set to 30°C.

- 2 = Absolute priority (DHW service only)
Pre-set to 0.

3.4 MAIN FUNCTIONS

3.4.1 Domestic Hot Water Priority function

The domestic hot water priority function allows that when
there is demand for domestic hot water, the master board can
also serve the high or low temperature circuit.

3.4.2 Anti-frost function

The frost protection function, also active in standby, starts the
pump in the high temperature circuit and the loop pump if the
temperature in the manifold falls below 5°C. If the outdoor
probe is fitted, the pumps start if the outside temperature falls
below 3°C. If after 10 minutes the temperature in the manifold
is less than 5°C, one burner starts at maximum output, until the

17

BOILER FUNCTIONING

TA_H = 1 &
TA_L = 0 &
DHW = 0

HIGH TEMPERATURE

CIRCUIT

TA_H = 0 or
TA_L = 1 or
DHW = 1
ERROR = 255

STAND BY

TA_H = 0 &
TA_L = 1 &
DHW = 0

LOW TEMPERATURE

CIRCUIT

TA_H = 1 or
TA_L = 0 or
DHW = 1
ERROR = 255

ERROR = 255

LOW AND HIGH
TEMPERATURE

CIRCUIT

NO

TA_H = 1 &
TA_L = 1 &
DHW = 0

TA_H = 0 or
TA_L = 0 or
DHW = 1
ERROR = 255

YES

ANTI-FROST

DHW = 1

DHW

DHW = 0
ERROR = 255

ALARM

ERROR = 255 MEANS ABSENCE OF ERRORS

Fig. 3.3

temperature in the manifold reaches 20°C. If after 10 minutes
the temperature in the manifold exceeds 5°C but the outside
temperature is less than 3°C, the pumps stay on until the out­side temperature exceeds this value.

3.4.3 Dispersion function

Thanks to the dispersion function the pumps in the high and
low temperature circuits remain on for 5 minutes after the last
burner has shut down. There is a 6-minutes delay from the mo­ment when the burner shuts down to the moment when the
two-way valve is closed or the injection pump is switched off.
When the last burner has shut down, the valve closes only
when there is no demand from the room thermostat.

3.4.4 Cascade management function

With the cascade management function is possible to select
between minimum and maximum number of burners to be
switched on to provide the power requested by the system.

ERROR

CHECK

ERROR = 255

3.4.5 Switch ON/OFF management function

In both cascading modes there is a function that limits the ig­nition and shutdown of the burners in the event of low heating
requirement.

3.4.6 Emergency function

In the event of faults on the Master board, there are two was of
manually controlling the Slave boards:

- By eBUS and manifold probe

Disconnect the power supply from the system, unplug the
BUS. Set the address 000000 on all the Slave boards (J10
and J17 OFF). Connect a power supply between 21 and 28
Vac to the BUS. If the Manifold Temperature < Emergency
Temp. (Par.40; pre-set to 70°C; settable between 10 and
80°C) all the burners operate at maximum output. If the
Manifold Temperature > Emergency Temp. + 5°C all the
burners are stopped.

18

BOILER FUNCTIONING

-By PC

Disconnect the power supply from the system, unplug the
BUS and connect the PC interface. The output of the burners
can be sent directly to the Slave boards using the PC.

In the event of faults, contact BERETTA Technical



Assistance Service or a suitably qualified person.

3.5 PARAMETERS SETTING

3.5.1 Password setting

The installer parameters can be changed by entering the pass­word (22) from the readout mode. The password for the in­staller level allows access to display and change the user and
installer parameters. Procedure to enter programming mode:

Procedure Display

E.g.: the outlet temperature T1 is

1

80°C.

Press “Set/Esc” and “OK”. After 5

2

seconds the second and third digit
will flash.

Use “+” and “-” to enter on the
right-hand side digit the second ci-

3

pher of the password. E.g.: pass­word = X2.

Procedure Display

Use “+” and “-” to enter on the cen-

5

tral digit the first cipher of the pass­word. E.g.: password = 22.

Press “OK” to confirm the password, if the password is

6

wrong the board returns to Display mode.

Press “+” and “-” to scroll the parameters enabled by the
password. Press “Set/Esc” to start setting the parame-

7

ters. The code P-XX and the corresponding value will al­ternate on the display.

Use “+” and “-” to change the value of the parameter.
Whenever a button is pressed, the alternating display of

8

the parameter and the corresponding value is stopped for
5 seconds and only the value is shown.

9 Press “OK” to save the new value of the parameter.

To exit installer programming mode press “Set/Esc”.

3.5.2 Parameters list

This boiler is equipped with a Master PCB that allows, via the
functional parameters setting, a superior customisation to sat­isfy all the system or user needs. The programmable parame­ters are the ones reported in the following table.

Press “OK” to save the second ci-

4

pher of the password.

N. Name

USER Parameters

1 SetPoint_ch_high 10 Par. 17 70 °C

2 SetPoint_DHW 10 Par. 8 50 °C

3 SetPoint_ch_low 10 Par. 23 40 °C

INSTALLER parameters accessible by password 22

6 DHW_type 0 6 0

limit

Lower

limit

Upper

settings

Factory

U.M. Description

If Par. 14=0 this is the high temperature circuit set
point.

If Par. 14=1 this is the maximum temperature in the
high temperature circuit.

If Par. 22=0 this is the low temperature circuit set
point.
If Par. 22=1 this is the maximum temperature in the
low temperature circuit.

0 = No DHW service
1 = Instant with NTC probe
2 = Storage tank with NTC probe
5 = Instant with flow switch
6 = Storage tank with thermostat

19

BOILER FUNCTIONING

N. Name

7 P_DHW_max 1 255 230

8 T_DHW_limit 10 80 60 Limit for user DHW setting

9 DHW_priority 0 2 0

10 T_tank_extra 0 50 30 °C Thermal unit temperature in DHW = Par. 2 + Par. 10

11 T_tank_hyst_up 0 20 1 °C Upper DHW differential

12 T_tank_hyst_down 0 20 5 °C Lower DHW differential

13 N°_bruc_DHW 1 60 60 Maximum no. of burners in DHW

14 CH_type_high 0 3 1

15 P_ch_max 1 255

limit

Lower

limit

Upper

155

(DEP)

230

U.M. Description

settings

Factory

Maximum speed/output in DHW. The power changes
proportionally from 15 kW = 1 to 45 kW = 255. Every
point from 1 t o255 is equal to 0,12 kW. If for instance
we want to set a power of 30 kW for each thermal en­gine, we will insert 127.

0 = Sliding A
1 = Sliding B
2 = Absolute priority

0 = Fixed temperature
1 = Climate with outside probe
2 = 0-10 Vdc for heat output
3 = 0-10 Vdc for temperature

Maximum speed/output in CH

0 = No priority between circuits

16 CH_priority 0 2 0

17 T_CH_high_limit 10 80 80 °C Limit for user high temperature circuit setting

18 T_CH_high_foot 10 Par. 1 50 °C

19 CH_high_mod_hyst_on 0 20 7 °C Hysteresis ON for high temperature pump

20 CH_high_mod_hyst_off 0 20 3 °C Hysteresis OFF for high temperature pump

21 Attenuation_high 0 70 0 °C Set point attenuation with room thermostat open

22 CH_type_low 0 3 1

23 T_CH_low_limit 10 70 50 °C Limit for user low temperature circuit setting

24 T_CH_low_foot 10 Par. 13 25 °C

25 Attenuation_low 0 70 0 °C Set point attenuation with room thermostat open

26 CH_low_hyst_on 0 20 5 °C

27 CH_low_hyst_off 0 20 3 °C

28 Mix_valve_step_ open_time 0 255 5 s For each step the valve opens 1/2 of the set value

1 = Priority to the high temperature circuit
2 = Priority to the low temperature circuit

Min. high circuit set point at the maximum outdoor
temperature (Par. 38)

0 = Fixed temperature
1 = Thermoregulation with outdoor probe
2 = 0-10 Vdc for heat output
3 = 0-10 Vdc for temperature

Min. low temp. circuit set point - at the maximum out­side temperature (Par. 38)

Hysteresis ON for low temperature circuit calculated
on the T flow Mix

Hysteresis OFF for low temperature circuit calculated
on the T flow Mix

29 Mix_valve_step_close_time 0 255 7 s For each step the valve closes 1/2 of the set value

30 Mix_valve_interval_time 0 255 5 s Mixing valve delay

31 Mixing_p_hyst 0 255 2 °C Hysteresis for maximum valve opening

32 Mixing_still_hyst 0 255 2 °C

20

BOILER FUNCTIONING

N. Name

limit

Lower

limit

Upper

33 Power control mode 0 1 1

rd

34 3

pump 0 1 0

U.M. Description

settings

Factory

0 = Minimum number of burners
1 = Maximum number of burners

0 = System/loop
1 = Low temperature circuit

35 Frost protection -30 15 3 °C System

1 = NG with flue < 15m

36 Gas_type 1 7 1

2 = NG with flue > 15m
3 = LPG with flue < 15m
4 = LPG with flue > 15m

37 T_out_min -20 30 0 °C Minimum outdoor temperature

38 T_out_max 0 30 18 °C Maximum outdoor temperature

39 T_out_correct -30 30 0 °C Outdoor temperature correction

40 T_emergency 10 80 70 °C

41 Parameter_reset 0 1 0

42 Flow switch_si/no 0 1 1 0 = The slave does not control the pressure switch

43 Protocol 0 1 1

0 = Eco protocol
1 = Argus link (new)

MANUFACTURER Parameters (OEM) accessible by password 82

REMARK - These parameters should not be modified

44 T_ch_high_max 10 117 90 °C Upper limit for Par.17

45 P_factor_CH_high 0 255 30

46 I_factor_CH_high 0 255 70

47 D_factor_CH_high 0 255 128

48 Ch_H_block_time 0 255 0 min

Proportional Constant for the high temperature circuit
power modulation

Integral Constant for the high temperature circuit pow­er modulation

Derivative Constant for the high temperature circuit
power modulation

When the TA_H opens the system accepts a new heat
request only after the set time

49 Postcirc_high 0 255 5 min Postcirculation of P1 (+P3)

50 T_H_correct_20° -30 30 0 °C

51 T_H_correct_85° -30 30 1 °C

52 Blocking_time_ DHW-CH 0 255 0 min

Correction of the value read by the collector probe at
20°C

Correction of the value read by the collector probe at
85°C

The burner stays OFF for the set time in the passage
from DHW to CH

53 T_ch_low_max 10 90 80 °C Upper limit of the Par. 23

54 P_factor_CH_low 0 255 30

55 I_factor_CH_low 0 255 70

56 D_factor_CH_low 0 255 128

Proportional Constant for the low temperature circuit
power modulation

Integral Constant for the low temperature circuit pow­er modulation

Derivative Constant for the low temperature circuit
power modulation

57 Ch_L_block_time 0 255 0 min

58 T_dhw_max 10 117 80 °C

59 P_factor_DHW_istantaneous 0 255 30

21

BOILER FUNCTIONING

N. Name

limit

Lower

limit

Upper

U.M. Description

settings

Factory

60 I_factor_DHW_istantaneous 0 255 70

61 D_factor_DHW_istantaneous 0 255 128

62 P_factor_DHW_storage 0 255 30

63 I_factor_DHW_storage 0 255 70

64 D_factor_DHW_storage 0 255 128

65 Dhw_&_ch_hysterese_up 1 80 1

66 Dhw_&_ch_hysterese_down 1 80 50

67 T_tank_hyst_down_2 0 20 5

68 T_tank_hyst_up_2 20 3

69 Postcirc sanitary 0 255 3 m

70 Hyst_up_reduce_burner 0 20 2 °C

71 Hyst_down_add_burner 0 20 5 °C

72 Hyst_up_quick_stop 0 80 4

73 Hyst_down_quick_start 0 80 70

74 Quick stop time 0 255 2 s

75 Quick start time 0 255 2 s

Wai time after

76

burner_switched

025530 s

77 Cycle_limitation 0 1 0

78 Cycle_limit_stop 0 255 60

79 Cycle_limit_inc 0 50 10

80 Cascade Rotation 0 255 24 h

81 Flow Switch 0 1 0

82 Return probe 0 1 1

83 Maximum_fan_speed_slave 20 70 57 rpm

84 Minimum_fan_speed 20 Par.83 25 rpm

85 Ignition_fan_speed Par.84 Par.83 45 rpm

86 Prepurge_fan_speed Par.84 Par.83 45 rpm

87 Max flow temperature 10 117 90 °C

88 Max return temperature 10 117 80 °C

89 Max flue temperature 10 117 80 °C

90 Flue Temperature Safety 0 1 0

91 T.max flow/return Safety 0 1 0

Pump postcirculation/slave

92

valve

02556 m 255 = Continuous functioning

93 D_max_flow_return 10 99 35 °C

94 Postcirculation 3

rd

pump 0 255 5 m 255 = Continuous functioning

0 = NO flow switch
1 = YES flow switch

0 = NO return probe
1 = return probe present with control on ∆T

0 = Volatile lockout
1 = Permanent lockout

0 = Volatile lockout
1 = Permanent lockout

∆ > Par.93: OFF
∆ > Par.93 - 5°C: Minimum
∆ > Par.93 -10°C: Power reduction of 60°C.

22

BOILER FUNCTIONING

N. Name

limit

Lower

limit

Upper

U.M. Description

settings

Factory

95 Password 00 99 22-44 DO NOT MODIFY

96 Hyst_up_PID_I_reduce 0 10 1

If T.flow ≥ setpoint + Par. 96, the Par. 97 is deducted

97 I_reduce_value 0 30 1 s

from the high bit of the sums of the differences from
the set. Reduction of the fastest integral factor

98 Low_load waiting 0 255 60 s

Waiting time of the Master to recognise the low load
condition

Waiting time to enable the low load condition. The low

99 Low_load period 0 255 60 °C

load condition is active if the T.flow is above the set
temperature with PAR. 9B and remains high after the
time set with Par. 99.

9A Neg_delta2_T 0 20 8 °C

9B Calc_neg_delta 0 1 1

9C Neg_delta2_T 0 30 0 °C

9D Low_load_∆ 0205 °C

9E Hyst_∆_mand/rit. 0 5 2 °C

This is used to reset the burners power when T.flow <
setpoint - Par. 9A

0 = Calculation low load from 85°C
1 = Calculation low load from set-point

It is used to reduce the burners power when T.mand ≥
Setpoint - Par. 9C. the power reduction is 60/1°C

The low load condition is active with T.flow > Setpoint
+ Par. 9D

Hysteresis of Par. 93: the burner is switched off with ∆
> Par. 93 and is switched on when ∆ < Par. 93- Par. 9E

3.6 SETTINGS

The POWER PLUS Boiler is supplied for operation on G20
(natural gas), as indicated on the rating plate, and has already
been adjusted in the factory by the manufacturer. If, however,
the adjustments need to be performed again, for example after
special servicing operations, the replacement of the gas valve,
or alternatively following the conversion from G20 to G30­G31 or vice-versa, proceed as follows.

The adjustments at maximum and minimum output



must be carried out in the sequence described, and
only by BERETTA Technical Assistance or qualified
personnel authorised by BERETTA.

TEST mode

In Test mode, a high temperature heating demand can be gen­erated corresponding to maximum and minimum power. All
the system fans must be activated. If the installer switches off
some of the Slaves, the others, connected to the Master, must
continue operating.

To enter Test mode from Display mode, proceed as follows:

Procedure Display

Press “Set/Esc” and “+” at the same
time per 5 seconds. After 5 seconds the
maximum or minimum speed can be se­lected using the “+” and “-” buttons.
All the system fans will operate at the
selected speed. The first digit will show

1

the selected speed:
H = maximum speed
L = minimum speed
The other two digits will show the out-

let temperature. E.g.: T1 = 80°C.

Press “OK” to exit Test mode and re-

2

turn to Display mode.

3.6.1 Maximum power CO

2 setting

- Press the “Set/Esc” and “+” buttons together for 5s.

- Start the boiler by the room thermostat (close). The boiler

will operate at maximum output showing “H” on the dis­play, followed by the flow temperature (chimney sweep
function).

- Unscrew the protective cap (1 - F

IG. 3.4) with a socket

wrench of 10mm and insert the combustion analyser probe.

- Adjust the CO

(2 - F

IG. 3.4) located on the fan assembly (turning clock-

wise decreases the CO

2 using a screwdriver on the adjustment screw

2 value), so as to achieve a value of

9.4% for G20 and 10.7% for G30-G31.

23

BOILER FUNCTIONING

2

The conversion must only be carried out by BER-



ETTA Technical Assistance or qualified personnel
authorised by BERETTA, even when the boiler is
already installed.

Once the conversion has been completed, set the



boiler again as described in S

ECT.3.6, PAGE 23.

Before performing the conversion:

- Disconnect the power supply

from the appliance by moving

ON

the main switch to “OFF”.

1

Fig. 3.4

3.6.2 Minimum power CO2 setting

- Press the “Set/Esc” and “-” buttons together for 5s. The
boiler will operate at minimum output showing “L” on the
display, followed by the flow temperature.

- Remove the protective cap on the gas valve by using an
Allen key (5 mm). Adjust the CO
on the adjustment screw (3 - F
sembly (turning anticlockwise decreases the CO

2 using the same Allen key

IG. 3.5) located on the fan as-

2 value),

so as to achieve a value of 8.4% for G20 and 8.7% for G30­G31.

3

- Close the fuel general valve.

To fit the kit:

- Unscrew the fastening screws (1

- F

IG. 3.6) on the front panel (2 -

F

IG. 3.6).

2

OFF

1

Fig. 3.5

3.6.3 Adjustments verification

Press the “Set/Esc” and “+” buttons together for 5s and check
the max CO

2 value (9.4% for G20 and 10.7% for G30-G31).

Then press the “Set/Esc” and “-” buttons for 5s and check the
min CO

2 value (8.4% for G20 and 8.7% for G30-G31).

After having completed the checks:

- Stop the chimney sweep function by pressing “OK”.

- Adjust the thermostat (open) so as to stop the boiler.

- Remove the analyser probe and carefully retighten the flue
test point cap (1 - F

IG. 3.5) with a socket wrench of 10 mm.

3.7 GAS CONVERSIONS

The POWER PLUS Boiler is supplied for operation on G20
(natural gas). However, it can be converted for operation on
G30-G31 (LPG), using the special kit supplied.

1

Fig. 3.6

- Pull the base of the panel (2 - F

IG. 3.6) outwards and then

upwards to release it from the frame and then remove it.

- Set parameter 36 to 3 or 4, according to the length (L) of the
flue:

• 3 = L < 15 m

• 4 = L > 15 m.

The fan speed is adapted automatically.

- Disassemble the gas valve from the fan assembly by loosen­ing the three screws (3 - F

IG. 3.7).

3

Fig. 3.7

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