FIGURE 24: STANDING PILOT BURNER FLAME
FIGURE 25: INTERMITTENT IGNITION PILOT BURNER FLAME
10)Make sure vent damper is in open position when main burners are firing.
11)Inspect the main burner flames visible through the observation port in burner access panel. The flame should be stable and mostly blue (see Figure 26). No yellow tipping should be present; however, intermittent flecks of yellow and orange in the flame are normal.
12)Check entire gas train for leaks using soap and water or other approved leak detection method while boiler is firing. Fix any leaks found immediately.
WARNING
•NEVER USE A FLAME TO CHECK FOR GAS LEAKS.
•MAKE SURE THAT THE AREA AROUND THE BOILER IS CLEAR AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE, AND OTHER FLAMMABLE VAPORS AND LIQUIDS.
•DAMPER MUST BE IN OPEN POSITION WHEN APPLIANCE MAIN BURNER IS OPERATING.
13)Run gas valve safety shutdown test:
•For standing pilot boiler models, disconnect the thermocouple from gas valve. Both pilot burner and main burners should stop firing.
•For intermittent ignition boiler models, with main burners firing, disconnect ignition cable from ignition module. Both pilot burner and main burners should stop firing.