35
16. Sequence of operation
The Domestic Hot Water (DHW) production always has priority over the Central Heating (CH) mode.
When a hot tap is turned on, the DHW flow switch is activated. The minimum DHW flow rate is 2 l/min. If the diverter valve is in
t
he CH position it will motor into the DHW position and the boiler will start.
The LCD will show that the boiler is working in hot water mode as below:
The appliance follows the same operating logic as described in Section 16.1 Central Heating Mode.
In domestic hot water mode NTC1 limits the maximum temperature of the primary heating circuit to 78°C during DHW production,
re-ignition will occur at 74°C. The domestic hot water temperature is limited to 64°C, re-ignition will occur at 62°C.
The NTC
at the end of the plate heat exchanger is the only NTC used for the regulation according to the DHW setting.
The DHW setting is adjustable from 40°C to 60°C by the user.
The PCB compares the values of the DHW NTC with the setting of the DHW control knob. If the temperature of the DHW NTC is
4°C greater than the temperature set on the DHW control knob, the burner will go off, it will restart when the temperature of the
DHW NTC is less than + 2°C of the temperature set on the DHW control knob.
16.2 Domestic Hot Water Mode
To Next Page
Loading...
Need help?
General