Buderus Logano G234X-64 Installation And Service Instructions Manual page 21

16. Remove the safety screw for the pilot orifice pressure setting
( Fig. 23, [5]).
Turn the inner adjustment screw clockwise to reduce the size of the
ignition flame. Turn the inner adjustment screw counterclockwise to
increase the size of the ignition flame.
17. After adjustment, tighten the safety screw for the pilot orifice
pressure setting (Fig. 23, [5]) again.
18. Observe the main burner flame through the inspection hole in the
burner cover ( Fig. 21 [1], page 19). The flame must have a
steady and fixed contour and generally has a bluish color.
If the main burner flame has the proper appearance, continue with
step 21.
If the main burner flame is too weak, yellow or goes out, turn the ON/
OFF knob ( Fig. 23, [1]) on the gas shutoff valve clockwise to the
OFF position. Close the gas shutoff valve, disconnect heating
system from the power supply and inform the customer service
technician or gas supply company.
Fig. 25 Main burner
[1] Main burner flame
Checking the flame sensor
19. Check the safety switch by closing the gas shutoff valve. The main
burner flame ( Fig. 25) and the ignition flame ( Fig. 24) are
extinguished. After no more than six (6) seconds, the main gas
solenoid valve on the gas valve must close with an audible noise.
20. After 90 seconds, the burner controller must switch to locked status
and stop generating sparks.
21. Disconnect the heating system from the power supply. Open the gas
shutoff valve. Switch on the power supply for the appliance.
A normal operating cycle must follow. If the gas valve operates
correctly: Proceed to step 25.
22. If the gas valve does not operate correctly: Immediately turn the
ON/OFF knob on the gas valve [1] clockwise to the OFF position.
Close the gas shutoff valve. Disconnect heating system from the
power supply and inform the customer service technician or gas
supply company.
Logano G234X – 6 720 811 233 (2017/02)
Placing the heating system in operation
Fig. 26 Gas valve in OFF position
[1] ON/OFF knob (OFF position)
23. Turn the gas valve ON/OFF knob [1] clockwise to the OFF position.
24. Close the gas shutoff valve.
25. Disconnect heating system from the power supply and set the
thermostat to the lowest setting.
26. Remove pressure test port and pressure gauge for measuring the gas
supply pressure and orifice pressure from the gas valve. Close the
openings with the screw plugs ( Fig. 27 [2] and [3].
27. Repeat steps 1...10 (depending on the control unit used) and
step 20.
This starts up the heating system again.
Check the screw plugs [2] and [3] for leaks with soap solution.
If no leaks are found, continue with step 31.
28. If leaks are found, close the gas shutoff valve And turn the ON/OFF
knob on the gas valve [1] clockwise to the OFF position. Shut off the
heating system from the power supply.
Seal the leaks. Open the gas shutoff valve and repeat step 23.
29. To avoid corrosion, carefully wipe off the soap solution afterwards.
Fig. 27 Gas valve
[1] ON/OFF knob (ON position)
[2] Screw plug for gas supply pressure test port
[3] Screw plug for orifice pressure test port
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