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Natural Gas
GC 144 II
[inch W.C.]
18
3.5
25
3.5
32
3.5
Table 10 Orifice pressure at 60°F / 30" Hg. These values are only valid in
the U.S.A. and only for elevations from 0-8500ft.
1
5
4
Fig. 24 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
▶ Record the measured value in the start-up protocol. Install the safety
screw back into the gas valve.
▶ Observe main burner flame through the sight glass ( figure 22,
page 16) 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, proceed to the next step. If the main burner
flame is weak, yellow, or goes out, turn the ON/OFF knob (
figure 26) 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.
Logano GC 144 II – 6 720 808 893 (2017/02)
LP
[inch W.C.]
8.8
8.6
8.7
2
3
Fig. 25 Main burner
[1]
Checking flame rod
▶ Test the flame rod by closing the gas shut-off. The main burner flame
6 720 804 440-24.1T
Fig. 26 Gas valve
[1]
▶ After 90 seconds the igniter stops generating sparks for five (5)
▶ Disconnect the heating system from the main power source. Open
▶ If the main burner flame lights and burns to spec, proceed to the next
Final start-up procedures
1
Main burner flame
( figure 25) 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.
1
ON/OFF knob (shown in ON position)
seconds.
main gas shut-off. A normal operating cycle must follow.
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.
12
6 720 804 440-25.1T
6 720 804 440-26.1T
17
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