Buderus Logano GC124 II/SP Installation And Service Instructions Manual page 31

Final start-up procedures for GC124 II models
Checking gas supply pressure
5. Check the gas supply pressure while the boiler is
operating. The connection 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 6. If the supply pressure does not
meet the above criteria, close gas line and contact
the gas company.
Checking orifice pressure
6. Compare the orifice pressure with the values in
Tab. 8. If it differs by more than 0.2" W.C., adjust
accordingly. To set the orifice pressure, the
protective screw on the gas valve must be removed
( Fig. 24). 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 II
[inch W.C.]
18
25
32
Tab. 8 Orifice pressure at 60°F / 30" Hg. These values are
only valid in the U.S.A. and only for elevations from
0-8500ft.
7. Record the measured value in the start-up protocol.
Install the safety screw back into the gas valve.
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Gas Boiler Logano GC124 II/SP • Issue 07/2006
LP
[inch W.C.]
3.5 8.8
3.5 8.6
3.5 8.7
1
5
4
Fig. 24 GC124 II gas valve
1 ON/OFF knob (shown in ON position)
2 Safety screw on gas supply pressure measurement port
3 Safety screw on orifice pressure adjustment port
4 Safety screw on orifice pressure measurement port
5 Safety screw on ignition gas adjustment screw
12
2
3
31