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:
¾ Flue Gas Safety System
¾ Flame Failure Safety System
¾ Over-heat Safety System (105
0
C)
¾ DHW (Domestic Hot Water) Over-heat Safety System (75
0
C)
¾ CH (Central Heating) Over-heat Safety System (95
0
C)
¾ High Water Pressure Protection System (3 bar)
¾ Low Water Pressure Protection System (0,8 bar)
¾ Low Voltage Protection System (185 VAC)
¾ Thermal Accumalation Protection System (with by-pass circuit and “pump over-run”)
¾ Frost Protection System (The appliance must be on stand-by mode to activate frost protection
system)
¾ Pump Anti-sieze Function
¾ 3 Way Anti-sieze Function (in monothermic types)
¾ Automatic Air Vent
¾ Expansion Vessel
¾ DHW 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.
2
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