GOLD CGs 
7b Start-up — operate boiler (continued)
If you discover evidence of any gas leak, shut down the boiler at once. Find the leak source with bubble test and repair immediately. Do not start boiler again until cor- rected. Failure to comply could result in severe personal injury, death or substantial property damage.
Check burner flames
View pilot and main flames through the inspection port in the Air inlet box front cover.
Pilot burner flame (Figure 16)
PROPER pilot flame characteristics
1.Blue flame.
2.Inner cone engulfing pilot flame sensor.
3.Pilot flame sensor glowing cherry red.
IMPROPER pilot flame characteristics:
1.Overfired — Large flame lifting or blowing past pilot flame sensor.
2.Underfired — Small flame. Inner cone not engulfing pilot flame sensor.
3.Lack of primary air — Yellow flame tip.
4.Incorrectly heated pilot flame sensor.
Figure 16 Typical pilot burner flame
Figure 17 Typical main burner flame
Main burner flame (Figure 17)
PROPER main burner flame characteristics
1.
IMPROPER main burner flame characteristics
1.Overfired — Large flames.
2.Underfired — Small flames.
3.Lack of primary air — Yellow tipping on flames (sooting will occur).
7c Start-up — if boiler doesn’t start . . .
Check for:
1.Loose connections, blown fuse or service switch off?
2.High limit switch set below boiler water tempera- ture?
3.Thermostat set below room temperature?
4.Gas not turned on at meter or boiler?
5.Incoming gas pressure less than: 5” w.c. for natural gas?
11” w.c. for propane gas?
6.If none of the above corrects the problem, refer to Troubleshooting, Section 11 of this manual.
Part number
29
