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Figure 12: Gas Valve Pressure Tap
D. Prepare to check operation.
1. Obtain gas heating value (in Btu per cubic foot) from
gas supplier.
2. Connect manometer to pressure tap on gas valve.
See Figure 12.
3. For natural gas fired boiler, temporarily turn off all
other gas-fired appliances.
E. Follow Operating Instructions to place boiler in
operation. See Figure 17.
F. Sequence of Operation. See Figure 14. If boiler fails to
operate properly, see Troubleshooting Tree on pages
17-18.
G. Check gas piping and connections between Gas Valve
and Manifold, Orifices and Pilot Tubing. Use soap
solution or other approved method. See Figure 13.
H. Check pilot burner flame. See Figure 15. Flame should
be steady, medium hard blue enveloping 3/8 to ½ inch
of sensing probe.
I. Check main burner flame. See Figure 16. Flame should
have clearly defined inner cone with no yellow tipping.
Orange-yellow streaks should not be confused with true
yellow tipping.
Figure 13: Schematic Pilot and Gas Piping Figure 15: Pilot Burner Flame
Figure 14: Sequence of Operation