E.C.A. Fortius Manuale utente

24 kW Open Flued Gas Combination Boiler (bithermic type)

24 kW Room Sealed Fan Assisted Gas Combination Boiler (bithermic type)

24 kW Room Sealed Fan Assisted Gas Combination Boiler (monothermic type)

28 kW Room Sealed Fan Assisted Gas Combination Boiler (monothermic type)

SERVICE MANUAL

CONTENTS

PRODUCT

Product Notation

Safety Systems

Technical Data

Main Components

Operating Functions

GAS TYPE CONVERSION

Gas Pressure Adjustments

Replacement Of The Burner Injectors

Jumper Adjustment

ADJUSTMENTS

Service Setting Mode

Chimney Sweep Push-Button PB4

FAULT & FAILURE

PRODUCT

Product Notation

Table 1

Notation Description

FO 24 BB Fortius 24 kW Open Flued Gas Combination Boiler (bithermic type)

FO 24 HB Fortius 24 kW Room Sealed Fan Assisted Gas Combination Boiler (bithermic type)

FO 24 HM Fortius 24 kW Room Sealed Fan Assisted Gas Combination Boiler (monothermic type)

FO 28 HM Fortius 28 kW Room Sealed Fan Assisted Gas Combination Boiler (monothermic type)

Safety Systems

The safety systems in appliance provide entire safety for user and appliance. The safety systems are:

¾Flue Gas Safety System

¾Flame Failure Safety System

¾Over-heat Safety System (105 0C)

¾DHW (Domestic Hot Water) Over-heat Safety System (75 0C)

¾CH (Central Heating) Over-heat Safety System (95 0C)

¾High Water Pressure Protection System (3 bar)

¾Low Water Pressure Protection System (0,8 bar)

¾Low Voltage Protection System (185 VAC)

¾Thermal Accumalation Protection System (with by-pass circuit and “pump over-run”)

¾Frost Protection System (The appliance must be on stand-by mode to activate frost protection

system)

¾Pump Anti-sieze Function

¾3 Way Anti-sieze Function (in monothermic types)

¾Automatic Air Vent

¾Expansion Vessel

¾DHW safety stop function

Technical Data

Fortius 24 kW open flued gas combination boiler (FO 24 BB) is B type boiler (DIN EN 297). B

type boilers have an open combustion chamber. Combustion air is provided from the installation

room and products of combustion is discharged by means of approved flue ducts connections and a

chimney. Therefore, they are named as room air dependent gas appliances.

Fortius 24 / 28 kW room sealed fan assisted gas combination boilers (FO 24 HB, FO 24 HM, FO

28 HM) are C type boilers (DIN EN 483). C type boilers have a sealed combustion chamber.

Required fresh air for combustion is provided independently from the installation room by

concentric air/flue ducts and products of combustion can be also discharged by the same air/flue

ducts. Therefore, they are named as air independent gas appliances.

Table 2 FO 24 BB FO 24 HB FO 24 HM FO 28 HM Unit

Gas Category*

Boiler Type

Type of gas

Performances

Pmin, Min. Heat Output

Pmaks, Max. Heat Output

P%80, Heat Output

Qmin, Min. Thermal Load

Qmaks, Max. Thermal Load

Q%80, Thermal Load

Gas Consumption**

Natural Gas (Max. Load)

Natural Gas (Min. Load)

LPG

Gas Supply Pressure

Natural Gas

LPG

Domestic Hot Water

Min. Flow Rate For Activating***

Max. Flow Rate

Min. Operating Pressure

Max. Operating Pressure

Set Temperature Range

Central Heating

Min. Operating Pressure

Max. Operating Pressure

Set Temperature Range

General

Electrical Supply

Electrical Power Consumption

Expansion Vessel

Dimensions (HxWxL)

Weight (Net)

II 2H 3+

B 11 BS

Natural gas

LPG

8,4

19,2

9,3

26,6

21,3

2,77

0,97

2,08

28 / 37

10 (∆t=34)

0,3

35-60

0,8

40-80

230V AC- 50Hz

105

750x454x340

33,7

II 2H 3+

C12x, C32

Natural gas

LPG

8,4

19,2

9,2

26,2

2,73

0,96

2,08

28 / 37

10 (∆t=34)

0,3

35-60

0,8

40-80

230V AC- 50Hz

150

750x454x340

39,8

II 2H 3+

C12x, C32

Natural gas

LPG

8,4

19,2

9,2

26,2

2,73

0,96

2,08

28 / 37

10 (∆t=34)

0,3

35-60

0,8

40-80

230V AC- 50Hz

150

750x454x340

40,8

II 2H 3+

C12x, C32

Natural gas

LPG

9,8

22,4

10,7

30,6

24,5

3,19

1,12

2,39

28 / 37

12 (∆t=33)

0,3

35-60

0,8

40-80

230V AC- 50Hz

150

750x454x340

41,3

m3/h

kg/h

mbar

ltr/min

bar

V AC/Hz

watt

ltr

**For gas consumption calculation ; Natural gas: Hu=9,59 kWh/m3

LPG: Hu=12,793 kWh/kg

*** DHW ON flow rate can be adjustable as 3 ltr/min (default) or 3,5 ltr/min.

*the following gas categories can also be used

FO 24 BB FO 24 HB FO 24 HM FO 28 HM

Gas Categories II 2H 3B/P

II 2E 3B/P

II 2H 3B/P

II 2E 3B/P

II 2H 3B/P

II 2E 3B/P

II 2H 3B/P

II 2E 3B/P

Main Components

Table 3a

FO 24 BB FO 24 HB

1 Microcontroller Board

Bitermic (Main Board)

Microcontroller Board

Bitermic (Main Board)

2 User Interface User Interface

3 Gas Valve Gas Valve

4 Burner (13 blade) Burner (13 blade)

5 24 kW Heat Exchanger

(bithermic)

24 kW Heat Exchanger

(bithermic)

6 Hydroblock (bithermic) Hydroblock (bithermic)

7 a) Pump a) Pump

8 b) 3 Bar Pressure

Relief Valve

b) 3 Bar Pressure

Relief Valve

9 c) Discharge Tap c) Discharge Tap

10 d) Filling Tap d) Filling Tap

11 e) Water Pres. Sensor e) Water Pres. Sensor

12 f) Water Flow Sensor f) Water Flow Sensor

13 - -

14 DHW NTC Sensor

(Surface Mount)

DHW NTC Sensor

(Surface Mount)

15 CH NTC Sensor

(Direct Immersion)

CH NTC Sensor

(Direct Immersion)

16 - -

17 Limit Thermostat Limit Thermostat

18 Expansion Vessel Expansion Vessel

19 - Air Pressure Switch

20 TTB Sensor -

21 - Fan

22 Manometer Manometer

23 Ignition Electrode Ignition Electrode

24 Ionization Electrode Ionization Electrode

25 - Concentric Air/Flue Kit

26 Timer Timer

Table 3b

FO 24 HM FO 28 HM

1 Microcontroller Board

Monotermic (Main Board)

Microcontroller Board

Monotermic (Main Board)

2 User Interface User Interface

3 Gas Valve Gas Valve

4 Burner (13 blade) Burner (15 blade)

5 24 kW Heat Exchanger

(monothermic)

28 kW Heat Exchanger

(monothermic)

6 Hydroblock (monothermic) Hydroblock (monothermic)

7 a) Pump a) Pump

8 b) 3 Bar Pressure

Relief Valve

b) 3 Bar Pressure

Relief Valve

9 c) Discharge Tap c) Discharge Tap

10 d) Filling Tap d) Filling Tap

11 e) Water Pres. Sensor e) Water Pres. Sensor

12 f) Water Flow Sensor f) Water Flow Sensor

13 g) Plate Heat Exchanger

(12 plate)

g) Plate Heat Exchanger

(14 plate)

14 h) DHW NTC Sensor

(Direct Immersion)

h) DHW NTC Sensor

(Direct Immersion)

15 ı) CH NTC Sensor

(Direct Immersion)

ı) CH NTC Sensor

(Direct Immersion)

16 j) 3 Way Electrical

Valve

j) 3 Way Electrical

Valve

17 Limit Thermostat Limit Thermostat

18 Expansion Vessel Expansion Vessel

19 Air Pressure Switch Air Pressure Switch

20 - -

21 Fan Fan

22 Manometer Manometer

23 Ignition Electrode Ignition Electrode

24 Ionization Electrode Ionization Electrode

25 Concentric Air/Flue Kit Concentric Air/Flue Kit

26 Timer Timer

MICROCONTROLLER BOARD (MAIN BOARD)

The main board operates on 230 VAC, 50 Hz and drives gas valve, fan, pump and (in monothermic

types) 3 way electric valve. Dynamic air pressure test takes place before every ignition cycle. Limit

thermostat ensures extra safety level. Flame in the burner is checked regularly.

The main board provides all the functionality and safety of the boiler. The board was cased by a

plastic casing, which was mounted on the gas valve. The functionality of the board is provided with

2 microcontrollers (low voltage and high voltage microcontroller).

The board can be divided in 2 part: low voltage side and high voltage side. Both side have a

microcontroller. There is continuous communication between microcontrollers. Numerous data is

sent from one side to the another for check and comparison.

Wiring Diagrams

fig. 1a

fig. 1b

fig. 1c

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