Service Handbook OEB/OES/OGB/OGS
AS/11-2011 2_06e_Gas technology_b
The high performance blower is constructively dimensioned for more than
6000 r.p.m.
The blower speed is electronically regulated via a PWM input signal. The
return check is over the Hall sensor on the high performance blower. This
system makes possible regulating the exact speed and is for this reason
adapted for modulation processes.
2.6.3 Venturi-High performance burner system
i
Information: Description of the burner principle
The CONVOTHERM Venturi-High performance burner system is dependent on the
speed of the blower motors, based on the Venturi principle, the correct amount of
gas is suctioned via the gas valve.
The gas-air mixture is pressed via the blower into the burner tube where the
mixture from the Self-ignition is ignited. It ignites between the burner tube and the
burner chamber of the heat exchanger.
i
Information: Description of the safety principle
When a cooking programme is started, a request for heat is made by the controls
to the firing automat. At the same time, a signal is activated (PWM) from the
controls for the blower motor with a definite speed (from the IDM module). Thereby,
according to the Venturi-Principle, low pressure in the suction pipe is produced.
After a determined time, the controls will check whether the predetermined speed
has been reached. If that is the case, then the Self-ignition is activated and the
firing automat opens the gas valve. The gas is suctioned from the blower and
pressured into the burner chamber, where it is ignited by the Self-ignition.
The Ionization pin in the burner chamber reports to the firing automat, that a
correct flame is present. And the firing automat passes this information on to the
controls.
If a safety requirement is not achieved, the unit goes into error operation. In the
display, the error code E05.(1-9) is indicated.
Page 3 / 3
To Next Page
Loading...
Need help?
General
