37
06/2011 - Art. Nr. 13 018 118C
Function description
–
Control thermostat requests heat
–
The control device control program
starts when the air pressure switch
contact is at rest, sufficient gas
pressure is reported by the gas
pressure switch and the air flap is in
“ZU” position (cam II)
–
Burner motor starts up
–
The air flap opens to full load
position (cam I)
–
Pre-ventilation time approx. 30 sec.
During initial circulation time
–
The blower pressure is monitored.
–
The furnace is monitored for flame
signals.
Gas fuel selected
At end of initial circulation time:
–
the air flap is moved to gas ignition
position (cam III)
–
the ignition is closed
–
the main and safety valve are
opened
–
the burner starts up
–
the control system release at end of
safety time
–
the air flap is opened to “low load
(gas)” (cam V)
–
control operation starts
–
max. load gas is achieved in cam
position I
Oil fuel selected
At end of initial circulation time:
–
the air flap is moved to oil ignition
position (cam IV)
–
the ignition is closed
–
magnetic valve Y1 Stage 1 is
opened
–
the burner starts up (Stage 1)
Switchover to oil stage 2
When power stage 2 is requested:
–
the air flap is moved to the 2nd
stage position (cam VI)
–
in cam position VII, magnetic valve
Y2 opened, burner burns with two
nozzles
Switchover to oil stage 3
–
the air flap opens to stage 3 (cam I)
–
in cam position VII, magnetic valve
stage 3 opened
t1 Pre-ventilation time 30s
t2 First safety time 3s
t3 Pre-ignition time 6s
- Safety time when the flame
signal disappears < 1s
Commands for
combustion control
unit.
Necessary
input signals.
Function
Combustion control unit LFL 1.333/Function description
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