Buderus Logano GC124 II/SP Installation And Service Instructions Manual page 36

13 Final start-up procedure for GC124 SP models
8. If the ignition burner continues to go out after several
attempts, turn the ON/OFF knob on the gas valve to
OFF immediately to prevent gas from leaking.
Check ignition gas line for leaks with soapy water. If
no leaks are found, continue with step 9. If leaks
have been found, turn ON/OFF knob on gas valve
( Fig. 31) clockwise to the "OFF" position.
9. Seal leaks. Repeats steps 1 to 8.
10. The gas valve ON/OFF knob (
be set to ON if the red pilot ignition button is out.
Turn main power switch of the heating system ON.
11. Verify that the thermal element responds to heat.
12. The ignition flame must ignite the main burner. If the
main burner does not ignite, close the gas shut-off.
Disconnect heating system from the power source
and inform your customer service technician or gas
company.
Checking gas supply pressure
13. Check the gas supply pressure while the boiler is
operating. The supply pressure for natural gas must
be between 4.7" and 10.5" W.C. For propane gas
(LP) it must be between 11" and 13" W.C. If the gas
pressure is in the correct range, record the
measured value in the start-up protocol, then
continue with step 14. If the supply pressure does
not meet the above criteria, close gas line and
contact the gas company.
Checking manifold pressure
14. Compare the manifold pressure with the values in
Tab. 9. If it differs by more than 0.2" W.C., adjust
accordingly. To set the manifold pressure, the
protective screw on the gas valve must be removed
( Fig. 32). Turn the adjustment screw clockwise to
increase the pressure, and counterclockwise to
reduce the pressure. This setting must be adjusted
while the boiler is operating.
Natural Gas
GC124 SP
[inch W.C.]
18
25
32
Tab. 9 Manifold pressure at 60°F / 30" Hg. These values are
only valid in the U.S.A. and only for elevations from 0-
8500ft.
15. Record the measured value in the start-up protocol.
Install the safety screw back into the gas valve.
36
Fig. 31) can only
LP
[inch W.C.]
3.5 8.8
3.5 8.6
3.5 8.7
Installation and maintenance instructions Gas Boiler Logano GC124 II/SP • Issue 07/2006
1
Fig. 31 GC124 SP gas valve
1 ON/OFF knob (Shown in ON position)
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2
1
Fig. 32 Gasarmatur GC124 SP
1 Safety screw for igniter manifold pressure setting
2 ON/OFF knob (shown in the "ON" position)
3 Red pilot ignition button
4 Screw plug for gas pressure measurement port
5 Safety screw for manifold pressure setting
6 Screw plug for manifold measurement port
We reserve the right to make any changes due to technical modifications.
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