Buderus Logano G234X Installation And Service Instructions Manual page 20

6
Placing the heating system in operation
7. The burner control unit must generate ignition sparks towards the
pilot burner. The ignition flame must appear and then ignite the main
burner.
If the main burner does not ignite: Close the gas shutoff valve,
disconnect heating system from the power supply and inform your
customer service technician or gas supply company.
8. Once the main burner has ignited, the gas valve must be checked for
leaks with leak detector fluid. If no leaks are found, continue with
step 10.
9. If leaks are found: Turn the ON/OFF knob on the gas shutoff valve [1]
clockwise to the OFF position. Disconnect heating system from the
power supply and set the thermostat to the lowest setting.
Seal the leaks. Repeat steps 1 and 2.
TM
For AquaSmart control units, continue with steps 3 and 4.
Then repeat steps 7 to 10.
Fig. 22 Gas valve
[1] ON/OFF knob (ON position)
[2] Screw plug for gas supply pressure test port
[3] Safety screw for the orifice pressure setting
[4] Screw plug for orifice pressure test port
[5] Safety screw for the pilot orifice pressure setting
10. Check the gas supply pressure while the boiler is operating. The
supply pressure for natural gas must be between 7"...10.5" W.C.
(17.4...26.2 mbar) and between 11"...13" W.C. for propane gas
(27.4...32.4 mbar). Record the measured values in the
commissioning report ( page 23).
Natural gas
[inches
Boiler size W.C.]
38 3.0
45 4.1
55 4.6
64 4.4
Table 11 Orifice pressure
20
Propane
[inches
[mbar] W.C.] [mbar]
7.6 10.6 26.5
10.4 10.5 26.2
11.5 10.3 25.8
10.9 10.3 25.9
11. Check nozzle pressure. Set the orifice pressure according to
Table 11 while the boiler is operating. To do so, remove the safety
screw for adjusting the orifice pressure ( Fig. 23 [3]) from the gas
valve. Turn the adjustment screw clockwise to increase the orifice
pressure. Turn the adjustment screw counterclockwise to decrease
the pressure.
12. Record the value set in the commissioning report ( page 23).
Screw the safety screw for adjusting the orifice pressure [3] back
into the gas valve.
Fig. 23 Gas valve
[1] ON/OFF knob (ON position)
[2] Screw plug for gas supply pressure test port
[3] Safety screw for the orifice pressure setting
[4] Screw plug for orifice pressure test port
[5] Safety screw for the pilot orifice pressure setting
13. Observe ignition flame through the inspection hole in the burner
cover ( Fig. 21 [1], page 19).
14. The flame must surround the flame rod by 1/2...1 1/2 inches
(15...40 mm). If this is the case continue with step 20.
Fig. 24 Correct ignition flame setting
[1] 1/2...1 1/2 inches (12.7...38.1 mm)
[2] Ignition flame
The adjustment screw is located behind the safety screw
for the pilot orifice pressure setting ( Fig. 23, [5]).
Logano G234X – 6 720 811 233 (2014/05)