E.C.A. Fortius Service Manual page 29

- Domestic hot water can be obtained between 35°C and 60°C.
- Domestic hot water safety temperature is 75°C. If the temperature detected by DHW sensor is
above 75°C, DHW operation will stop (burner goes off).
- DHW operation is possible even if CH anti-cycling time is active.
- During DHW operation, min.-max. running mode selection is not possible with PB4 button (see
page 39) in both bithermic and monothermic types.
DHW priority cancellation function
DHW mode has priority over CH mode, but monothermic type boilers have DHW priority
cancellation zone. The cancellation zone is between 30
DHW priority cancellation zone, it is not possible to have domestic hot water even if hot water tap
is open. And the 3 way electric valve remains open to CH circuit.
DHW safety stop function
if DHW mode is active for a period longer than 60 min., DHW mode will stop automatically except
for winter operation in bithermic types, and the boiler will operate depending on system
configuration:
a) In Monothermic types
- if the boiler is in summer mode, the burner will switch OFF, and to reactivate DHW mode again, it
is necessary to close the hot water tap and open it again.
- if the boiler is in winter mode, winter mode will be active until closing the hot water tap and open
it again.
b) In Bithermic types
- if the boiler is in summer mode, the burner will switch OFF, and to reactivate DHW mode again, it
is necessary to close the hot water tap and open it again.
- if the boiler is in winter mode, DHW safety stop function wiil not be active.
DHW mode frost protection
In stand-by mode, if the DWH 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.
Central Heating Mode
3
The pump operates as long as the CH mode is active. When CH mode ends (and there is no DHW
demand), pump stops after pump over-run time. This condition is valid when the boiler is in pump
control mode 1 or pump control mode 2 and the room thermostat is connected. If the boiler is in
pump control mode 2 and the room thermostat is not connected, the pump will start operating when
the boiler is switched ON and will operate until switched OFF or a CH circuit low water pressure
error occurs or until there is DHW demand in bithermic models.
If DHW mode is activated in the pump over-run time following the CH mode, pump over-run time
is not completed. This prevents the hot water from going to CH circuit.
CH Mode Control Variables:
- CH potentiometer (P1 potentiometer)
- Water temperature detected by CH temperature sensor
- Hystherisis (10 °C)
o o
C and 35 C on the DHW potentiometer. In
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