E.C.A. Fortius - 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
o
C and 35
o
C on the DHW potentiometer. In
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)
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