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3.2 Commissioning
Checks to be performed on first ignition, and after all maintenance operations that involve the discon-
nection of the appliance from systems or intervention on the safety devices or parts of the burner:
Before igniting the burner,
• Check that the burner is correctly fastened to the boiler, and the preliminary adjustments described
previously have been performed.
• Make sure that boiler and the system have been filled with water or diathermic oil, that the valves in
the water circuit are open and that the flue gas exhaust pipe is free and correctly sized.
• Check that the boiler door is closed, so that the flame only propagates inside the combustion cham-
ber.
• Fit the pressure gauge and the vacuometer to the pump (removed before operation).
• Open the gate valves in the oil pipes, making sure that there is fuel in the tank and that the return
pipe is not blocked.
Attention: Blockages may cause the pump seal device to break.
Igniting the burner
• Connect electrical power by closing the main switch upstream of the burner
• Close the thermostat line (boiler/room)
• Reset the appliance (pressing the red button)
• Operation will start according to Figs. 10a and 10b and the diagram in Fig. 9:
1 The burner motor will start turning, together with the pump: the oil fed in is completely sent to the
return (Fig. 10a). The ignition transformer is activated at the same time.
2 The following phases are performed: pre-ventilation of the furnace, pre-washing of part of the oil
circuit, pre-ignition, with discharge between the tips of the electrodes.
3 At the end of the pre-washing phase, the appliance opens the electromagnetic valve (Fig. 10b): the
oil reaches the nozzle, from where it is sprayed. Contact with the discharge between the electrodes
ignites the flame. At the same time, the safety time starts, within which the photo cell must detect
the flame.
4 If the photo cell does not detect the flame, the burner shuts-down (the red light comes on).
Wait around 15 seconds, reset and repeat the ignition cycle.
Thermostats
Preheater
trigger thermostat
Burner motor
Ignition transformer
Electromagnetic valve
Photo cell
Shut-down signal
In particular, with single-tube systems, if the fuel inlet pipe is initially empty, the air contained in the
pipe must be vented for the fuel pump to be primed. It is recommended, before igniting the burner,
to loosen the pressure gauge connection screw on the pump and then perform the ignition cycle.
When the oil comes out of the screw, the pump is primed. Switch off the burner and tighten the screw.
EN
fig. 10a
Cod. 3540G302 - Rev. 01 - 02/2015
SUN G20 1S
fig. 9
fig. 10b
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