1. OPERATING INSTRUCTIONS ......................................................................................................................................6

1.1 Control panel ...........................................................................................................................................................6

1.1.1

Description of buttons .................................................................................................................................................................... 6

1.1.2

Display ........................................................................................................................................................................................... 7

1.2 Operation .................................................................................................................................................................7

1.2.1

Turning On/Off ............................................................................................................................................................................... 7

1.2.2

Air venting ..................................................................................................................................................................................... 7

1.2.3

Heating temperature adjustment ................................................................................................................................................... 7

1.2.4

Storage tank temperature adjustment ........................................................................................................................................... 8

1.2.5

Heating modulation ....................................................................................................................................................................... 8

1.2.6

Frost protection function ................................................................................................................................................................ 8

1.2.7

Circulating pump anti-blocking function ......................................................................................................................................... 8

1.2.8

Display of heating elements .......................................................................................................................................................... 8

1.2.9

Test Mode ...................................................................................................................................................................................... 9

1.2.10

External temperature compensation ............................................................................................................................................. 9

1.2.11

Anti-legionella function .................................................................................................................................................................. 9

1.3 Service menu .........................................................................................................................................................10

1.3.1

Parameters .................................................................................................................................................................................. 10

1.3.2

Faults history ............................................................................................................................................................................... 11

1.3.3

Deleting faults .............................................................................................................................................................................. 11

1.4 System hydraulic pressure adjustment ..................................................................................................................12

2. INSTALLATION ..........................................................................................................................................................13

2.1 General Instructions ...............................................................................................................................................13

2.2 Place of installation ................................................................................................................................................13

2.3 Boiler installation ....................................................................................................................................................13

2.3.1

Recommended distances ............................................................................................................................................................ 13

2.4 Plumbing connections ............................................................................................................................................14

2.4.1

Important ..................................................................................................................................................................................... 14

2.4.2

System water characteristics ....................................................................................................................................................... 14

2.4.3

Frost protection system, antifreeze liquids, additives and inhibitors ........................................................................................... 15

2.5 Electrical system ...................................................................................................................................................15

2.5.1

Connection of the room thermostat, the 3-way valve and the NTC temperature sensor of the DHW storage tank .................... 15

3. SUPPORT AND MAINTENANCE ................................................................................................................................17

3.1 Commissioning ......................................................................................................................................................17

3.1.1

Before starting the electric heating unit ....................................................................................................................................... 17

3.1.2

Startup ........................................................................................................................................................................................ 17

3.1.3

Inspection during operation ........................................................................................................................................................ 17

3.1.4

Turning off .................................................................................................................................................................................. 17

3.2 Maintenance .........................................................................................................................................................17

3.2.1

Maintenance to be carried out by the user .................................................................................................................................. 18

3.3 Repairs .................................................................................................................................................................18

3.3.1

Periodic inspection of the unit ..................................................................................................................................................... 18

3.4 Troubleshooting ....................................................................................................................................................19

3.4.1

Diagnostics .................................................................................................................................................................................. 19

4. TECHNICAL DATA AND CHARACTERISTICS ..........................................................................................................20

4.1 Dimensions and connections .................................................................................................................................20

4.2 General view and main components ....................................................................................................................21

4.3 Hydraulic circuit .....................................................................................................................................................22

4.4 Curve chart ............................................................................................................................................................23

4.5 Technical parameters .............................................................................................................................................24

4.5.1

Technical data table ..................................................................................................................................................................... 24

4.5.2

Table - Recommended sizes for switches and wires ............................................................................................................. 24

4.6 Wiring diagram .......................................................................................................................................................26

4.6.1

Wiring diagrams for models 6, 9 and 12 ...................................................................................................................................... 26

4.6.2

Wiring diagrams for models 18 and 24 ........................................................................................................................................ 27

4.7 Power supply connection .......................................................................................................................................28

cod. 3542B750 - Rev 09 - 02/2024