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599 34 41-93
SPARK PLUG / FLAME DETECTOR GAPS
In order to assure that the system functions correctly, the ignition spark plug and flame detector must be
correctly positioned.
The ignition spark plug/flame detector is secured by a rigid bracket in a precisely-determined position. If the
spark plug is bent or incorrectly positioned, this will alter the gap and may result in incorrect operation.
To ensure correct operation, proceed as follows:
The ignition spark plug/flame detector must be positioned at a distance of 3.75 mm (+0.25 -0.10) from the
burner. If the gap is different, it is necessary to replace the spark plug support.
Fig. 10
1 - IGNITION SPARK PLUG/FLAME DETECTOR
2 - OVEN BURNER
3 - SPARK PLUG SUPPORT
GAS CIRCUIT
The gas is ducted to the burner by a special solenoid valve which is actioned by the electronic control unit.
The gas passes from the coupling, through the ramp to the solenoid valve.
From the solenoid valve, the gas passes through the corresponding coupling to the nozzle fitted to the
burner (see fig. 6, page 8).
This type of oven is fitted with normally-closed valves (see fig. 7, page 9).
The solenoid must be energized in order to open the gas supply.
The solenoid is powered by direct current in order to prevent vibration inside the solenoid valve; the
electronic control unit governs the operation of the solenoid valve (see fig. 12, page 10).