Function of the N5.1 controller
• The controller is switched on via the main switch 1.
• Closing the loading door initiates an automatic function sequence
- The forced draught fan is switched on at high speed (for low boiler water temperature).
- When the boiler water temperature has risen (10 K below the temperature setpoint) the fan switches
over to the 1st stage.
- The fan is switched off when the temperature setpoint at the boiler temperature control (point 13, page
11) is reached.
- If the boiler temperature falls below the temperature setpoint at the boiler temperature control, the fan
is turned back on.
• The fan is switched off if the boiler runs out of fuel. A small quantity of embers is preserved for the next
fuel load.
• The smouldering gas extractor is turned on when the fuel loading door is opened to prevent any smoulder-
ing gases from escaping.
• If the fuel does not light during heat-up, the automatic cut-out switches off the fan unit.
Heating system control
13
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