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2.1B Checking the gas flow to the burner
1- Use the gas flow gauge to measure oven absorption.
2- Adjust the gas adjustment screw (A) as follows:
Turn it clockwise as far as it will go, and then loosen it for the no. of revolutions indicated on the table1.8.
Attention Turning the screw (A) anticlockwise or clockwise means increasing or decreasing the gas flow.
Check burner ignition following the user instructions.
If the burner does not ignite, the gas solenoid valve will be disabled by the electronic system, a red light on the
RESET buttons will indicate a block.
Press this button again to repeat the operation.
Sometimes, especially if the gas connection systems are newly-manufactured,
the previous operation will have to be repeated a few times in order to guaran-
tee normal gas flow.
Check that ignition does not cause blasts or signs of resonance.
3-Adjust the speed of the electric fan (C), in the following ways ( Fig. 2.1C):
A. Switch off the oven and connect the frequency meter to terminals (Y 1-3) on
the connector (X5) of the control panel (F) and start the oven again.
The speed of the electric fan is obtained from the following formula:
Speed rpm = Frequency (Hz) x 30
B. Check the max. (trimmer K) e min. (trimmer J) power
Start up the cooking chamber heating system, the burner will ignite with a low
number of electric fan revolutions, (set by the manufacturer). After ignition, the
Fig. 2.1C
electric fan (C) will reach max. speed.
This speed must be the same as the value stated in the technical table 1.8.
The regulation of the trimmers K and J is made and sealed in our factory, you don't need further regulations
(except for gas type G25 and G25.1 in some models).
4-When the oven is started, select the temperature of the coking chamber at a max.
Temperature of 270 °C,check the gas flow when the temperature is about 200°C and check that it corresponds
to the one given in the table 1.8.
Then, using the smoke analyser, check that it complies with regulations for combustion gases reaching the dis-
charge chimney.
Due to its dangerousness, It is essential that the carbon monoxide CO value is at zero.
After adjusting as described above, it will be necessary to check burner ignition again under its two operating
conditions:
Cold ignition is the norm at the start of operations;
Warm ignition is the condition present after at least 10 minutes of operating.
It is not necessary to check signs of resonance in the burner in either case. If there is resonance, repeat the
setting operations as described in paragraph 2.1B, point 2.
If the position of screw (A) is changed on the gas flow adjuster with the oven on at maximum, it will be neces-
sary to check point 4 again relating to cold operation.
N.B. The gas valve screw (B) (Fig.2.1B) does not require adjustment as it has already been set by the manu-
facturer to an air/gas ratio of 1/1
When transformation has ended, it will be necessary to seal the gas flow adjustment screw (A).
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