Conversion Instructions

5
Final start-up procedures
Logano GC 144 II – 6720808897 (2013/08) 7
5 Final start-up procedures
Verifying the ignition spark
▶ Look through the sight glass at the igniter and verify that a spark is
visible.
Fig. 9 GC 144 II
[1] Sight glass
▶ Should no spark be visible continue to troubleshooting procedure in
the installation and service manual.
▶ Turn ON/OFF knob ( figure 10) counterclockwise to the ON
position.
▶ The ignition flame will appear and 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.
Fig. 10 Gas valve
[1] ON/OFF knob (shown in ON position)
Checking gas supply pressure
▶ 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 the next step. If the supply
pressure does not meet the above criteria, close gas line and contact
the gas company.
Checking orifice pressure
▶ Compare the orifice pressure with the values in table 4. 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 ( figure 11,
page 8). 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.
WARNING: Risk to life from fire or explosion.
▶ Never use excessive force on the ON/OFF knob
( figure 10).
▶ Turn ON/OFF knob only by hand.
▶ Never use tools to turn knob.
▶ If you are unable to turn the knob by hand, do not try
to repair it.
▶ Call Buderus technical service for assistance.
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6 720 804 435-09.1T
GC 144 II
Natural Gas
[inch W.C.]
LP
[inch W.C.]
18 3.5 8.8
25 3.5 8.6
32 3.5 8.7
Table 4 Orifice pressure at 60°F / 30" Hg. These values are only valid in
the U.S.A. and only for elevations from
0-8500ft.
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