Buderus Logano GC 124 II User Manual page 8

5
Final start-up procedures
1
5
4
Fig. 11 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
B Record the measured value in the start-up protocol. Install the safety
screw back into the gas valve.
B Observe main burner flame through the sight glass (
page 7) in the burner plate. The flame must show a steady and stable
body and generally be of bluish color. If the main burner flame meets
the requirements, continue with the next step. If the main burner
flame is weak, yellow, or goes out, turn the ON/OFF knob
( figure 13, page 8) on the gas valve clockwise to OFF. Close the
gas shut-off and disconnect the heating system from the main power
source and contact the customer service technician or the gas
company.
Checking flame rod
B Test the flame rod by closing the gas shut-off. The main burner flame
( figure 12, page 8) and the ignition flame are extinguished. After
no more than six (6) seconds the main gas solenoid valve on the gas
valve must close with an audible noise. If the gas valve does not
operate correctly, turn ON/OFF knob on the gas valve clockwise to the
OFF position immediately. Close the main gas shut-off and disconnect
the heating system from the main power source and contact the
customer service technician or the gas company.
B After 90 seconds the igniter stops generating sparks for five (5)
seconds.
B Disconnect the heating system from the main power source. Open
main gas shut-off. A normal operating cycle must follow.
B If the main burner flame lights and burns to spec, continue with the
next step. If not, turn knob on gas valve clockwise to OFF position
immediately. Close main gas shut-off. Disconnect heating system
from the power source and inform the customer service technician or
gas company.
B Turn gas valve ON/OFF knob clockwise to OFF position.
B Close main gas shut-off.
B Disconnect heating system from the power source and set the
thermostat to the lowest setting.
8
B Remove pressure measuring nipple and pressure gauge for measuring
gas pressure and orifice pressure from the gas valve, and close the
openings with the screw plugs.
2
3
6 720 804 435-11.1T
Fig. 12 Main burner
[1] Main burner flame
figure 9,
Fig. 13 Gas valve
[1] ON/OFF knob (shown in ON position)
Checking for leaks
B Open main gas shut-off.
B Set thermostat at least 10°F above ambient to establish a heat
demand.
B Turn main power switch ON.
B Turn gas valve ON/OFF knob counterclockwise to ON position.
B After the burner has lit check the gas valve including screw plugs for
leaks using soapy water. If no leaks are found, continue with the step
after the next step. If leaks are found, close gas shut-off and turn ON/
OFF knob on gas valve clockwise to the OFF position. Disconnect the
heating system from the power source and turn thermostat to its
lowest setting.
B Seal leaks. Repeat all steps in this paragraph.
B Carefully wipe away the soapy water to prevent corrosion caused by
the alkaline content of the soap.
1
1
Logano GC 124 II – 6 720 804 435 (2012/09)
6 720 804 435-12.1T
6 720 804 435-13.1T