E.C.A. Fortius Service Manual page 30

- When there is CH demand, ignition starts and ignition state continues until flame is present.
- When the ignition state is over, the boiler will operate in normal modulation and reach the set
point within the time defined with slope (°C/min). After that, modulation continues.
- If the central heating water temperature exceeds 95°C in CH mode, over temperature error
(electronic limit) occurs and the boiler will remain in this error mode till water temperature drops to
a safe level (80°C). Pump keeps working in the over temperature error condition. When the
temperature drops, the boiler continues normal operation. This is a safety measure and should not
normally occur because when the water temperature exceeds the value set by the user plus
hystherisis ( max.80°C +10°C), the burner will go off.
- Water temperature interval in CH mode is 40°C - 80°C.
Outside temperature control (OTC) option
The boiler (CH mode) can operate depending on outside temperature if a OTC sensor is connected
to heating system. The pump has no over-run time.
- OTC has priority over room thermostat (if present).
- OTC function is only active when the boiler is in winter mode.
CH mode frost protection
In stand-by mode, if the CH temperature sensor detects temperature less then 6°C, CH mode is
activated (burner starts). As long as frost protection conditions last (till water temperature reaches
30°C) the burner operates in minimum capacity. When the water temperature reaches 30°C, burner
goes off.
Pump Behaviour
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The pump functions differently depending on the boiler operating modes.
In Stand-by Mode:
The pump does not normally work in stand-by mode. The pump will function in the following
conditions:
- In pump over run time
- If the temperature detected by the CH sensor is over 85°C, the pump will keep running till water
temperature drops to 80°C.
- Frost protection level 1: If the temperature detected by the CH sensor is below 8°C, the pump will
start running and keep running till the temperature reaches 10°C.
- In case of an error condition pump will switch on except low water pressure error which will
prevent the pump from dry running.
Exceptional Situation: The pump will run permanently in stand-by mode if the boiler is in pump
control mode 2 and the room thermostat is not connected.
In DHW Mode:
In monothermic types, when DHW mode begins, pump will run as in the CH mode (In bithermic
types, pump does not run in DHW mode). After DHW mode ends, pump behaviour depends on
system configuration:
- Monothermic & Winter Mode: pump runs for the defined over run time (3sec).
- Monothermic & Summer Mode & 3 Way Electric Valve: pump will run for 5 sec. more.
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