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Inspection and maintenance
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FA ROTEX A1 BO - 10/2007
8.2.4 Checking the flue gas temperature
The flue gas temperature can be checked:
– on the boiler control panel by using the Info button (see manual "ROTEX Control"),
– on the measuring piece of the flue gas pipe by using a flue gas thermometer.
If the flue gas temperature exceeds the boiler temperature by more than 40 K after 10 minutes of operating the burner, the
combustion chamber should be cleaned (see section 8.2.5).
Checking the flue gas temperature sensor
1.
Unscrew the box nut (fig. 8-11, pos. 4) and pull out the flue gas temperature sensor carefully with the guide sleeve
(fig. 8-11, pos. 3).
2.
Check flue gas temperature sensor for contamination and corrosion. Clean if needed. Do not use any metallic cleaning devices
(e.g. wire brush).
8.2.5 Checking and cleaning the combustion chamber
If there are impurities, or if unsatisfactory combustion values are detected, the combustion chamber must be cleaned and
readjusted. If necessary, reset the burner.
Opening the combustion chamber
Special tool:
Combustion chamber key, fixed on the inside of the boiler panels (included in the supply).
CAUTION!
The fitting position of the flue gas temperature sensors is factory-adjusted by a fixing screw. Modifying the
fitting position adversely affects the correct functioning of the flue gas temperature sensor.
• Never loosen the fixing screw (fig. 8-11, pos. 2) when inspecting the flue gas temperature sensor.
1
Sensor cable to the boiler control panel
2
Fixing screw –
Do not loosen!
3
Guide bush
4
Union nut
5
Flue gas temperature sensor
Fig. 8-11 Position of the flue gas temperature sensor
When replacing the flue gas temperature sensor, ensure that the end of the flue gas temperature sensor projects
28±2 mm
out of the guide sleeve.
WARNING!
Danger of burning on hot surfaces.
• Before starting work on the burners, the combustion chamber and the combustion chamber inserts, allow
them to cool down.
• Wear protective gloves.
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