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10090943EN
6.3. Burner Operation Principle
TZ
Limit thermostat
M1
Burner motor (fan/oil pump)
TS
Regulating thermostat
T1
Ignition transformer
E1 Preheater
EV1 Solenoid
valve
TSW Preheater thermostat
B1
Flame detector/flame signal
Prerequisites for start-up
•
burner is getting fuel
•
failures and interlocks are reset
•
contacts of switches of control voltage supply on control unit and contacts of
thermostats are closed, whereby the control voltage is applied to terminal 1 in control
unit.
A´ Start on burner with preheating
•
control signal from control unit terminal 8
•
preheater begins to heat up the fuel
•
contact of lower limit thermostat (TSW) in preheater closes after time ”tw” (approx.
1 min), when the oil temperature has reached approx. 70
°
C, whereby the control
signal is applied to terminal 3 in control unit.
A Start on burner without preheating
•
control signal is applied from terminal 8 to terminal 3 in control unit
•
burner motor (fan/oil pump) starts
•
pre-ignition
begins
•
pre-purge
begins.
B´ Solenoid valve receives control signal
•
safety time begins (max. 10 s)
•
solenoid valve opens (Danfoss) or closes (Suntec)
•
atomizing of oil begins
•
flame has to be ignited during safety time, otherwise control unit goes to lock-out
Required input signals to control unit
Control signals from control unit
