Buderus Logano G234X Installation And Maintenance Instructions Manual page 33

Checking flame sensor
21. Test the safety switch by closing the gas shut-off. The
main burner flame ( Fig. 36) and the ignition flame
( Fig. 35) are extinguished. After six (6) seconds at
the most the main gas solenoid valve on the gas valve
must close with an audible noise.
22. After 90 seconds the ignition module must switch to
lock status and stop generating sparks.
23. Shut off the heating system from the power supply.
Open the gas shut-off valve. Switch on unit power
supply.
A normal operating cycle must follow. If the gas shut-
off operates correctly, proceed to step 25.
24. If the gas shut-off does not operate correctly, switch
ON/OFF switch on the gas shut-off valve [1] clockwise
to the OFF position immediately. Close the gas shut-off
valve. Disconnect heating system from the power
supply and inform the customer service technician or
LP gas company.
25. Turn the gas valve ON/OFF button [1] clockwise to
the OFF position.
26. Close the gas shut-off valve.
27. Disconnect heating system from the power supply
and set the thermostat to the lowest setting.
28. Remove pressure measuring nipple and pressure
gauge for measuring gas supply pressure and nozzle
pressure from the gas valve. Close the openings with
the screw plugs [2] and [3] again.
29. Repeat steps 1 to 10 (depending on the control unit
used) and step 20.
Thus the heating system is started up again.
Check the screw plugs [2] and [3] for leaks with soap
solution.
If no leaks are found, continue with step 31.
Logano G234X - Technical specifications are subject to change without prior notice.
Commissioning the heating system
30. If leaks are found, close gas shut-off and switch ON/
OFF button on gas valve [1] clockwise to the OFF
position. Shut off the heating system from the power
supply.
Seal the leaks. Open the gas shut-off valve and repeat
step 23.
Fig. 37 Gas valve
1 ON/OFF button (at ON position)
2 Screw plug for gas connection pressure test port
3 Screw plug for nozzle pressure test port
31. To avoid corrosion, carefully wipe off the soap solution
afterwards.
32. Check the function of the maximum aquastat to make
sure that it switches off the boiler as soon as the boiler
water temperature set at the aquastat or the Logamatic
2000 control unit is reached. Record the result in the
commissioning log ( page 35).
Only for the Logamatic 2000 control unit
Select operating mode AUT (automatic mode) with the
mode selection switch.
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