12 Commissioning
12.3 Initial Lighting
DO NOT operate the boiler without water.
The lighting procedure of the boiler is fully automated.
Refer to diagram 12.2.
1. With no demand from any external controls, switch on the
electrical supply to the boiler.
Open the gas service isolation valve, see diagram 12.1.
2. Press and hold the “ Mode “ button of the boiler user
controls for 2 seconds, the Central Heating symbol,
will ash. Use the “SELECTOR” buttons to adjust CH
temperature.
After 10 seconds of inactivity the display will reset to indicate
the water temperature.
3. Turn ON your external controls and select the room
temperature required.
The boiler will operate automatically.
NOTE: The display will indicate the Heating system water
temperature or a fault code if in a fault condition.
NOTE: After ignition the boiler will ramp slowly to full rate
rather than going immediately to full rate. This is an adaptive
feature to cope with small system requirements.
After a period of 10 minutes, check that the supply inlet
pressure of the boiler is still 20mbar, disconnect the pressure
gauge.
NOTE: The burner pressure cannot be measured at the gas
valve as it is altered by the suction of the fan and modulated
according to demand.
14249
Diagram 12.2
14513
12.4 Gas Rates
Should any doubt exist about the gas rate, check it using the
gas meter test dial and stop watch. Make sure that all other
gas burning appliances and pilot lights are off.
It should be noted that this appliance will modulate the heat
input according to demand. This may affect the gas rates
measured if the appliance reaches its operating temperature
during the measurement.
The approximate gas rates:
In the unlikely event that the gas valve needs adjusting, refer
to section 13.9.
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