Ferroli SUN G50 Operating, Installation And Maintenance Instructions page 34

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 starts according to the diagram of fig. 8:
1 The burner motor will start turning, together with the pump: the oil fed in is completely sent to the
return. 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: 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.
Operating sequence
Thermostats
motor
1st-stage
solenoid valve
2nd-stage
solenoid valve
Ignition
transformer
Photo-cell
Key
A Start of commissioning for burners with no pre-heater
B Flame ignition time
C Operation
D Stop for R adjustment
t1 Pre-ventilation time
t3 Pre-ignition time
t3n Time after ignition
t4 Interval between flame signal and BV2 supply
TSA Safety time on starting
34
A B
R
W
SB
t1
M
BV1
BV2
t3
Z
FS
Output signal
Input signal request
Cod. 35445644 - 08/2007 (Rev. 00)
SUN G50 - G70
C
t4
t3n
TSA
fig. 8
D
GB