Weil-McLain 550-110-710/0107 7b Start-up— operate boiler continued, Pilot burner flame Figure

GOLD CGi Gas-Fired Water Boiler — Boiler Manual

7b Start-up — operate boiler (continued)

Check burner flames

Figure 28  Typical pilot burner flame

View pilot and main flames through the inspection port in the base burner shield.

Pilot burner flame (Figure 28)

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.

Main burner flame (Figure 29)

PROPER main burner flame characteristics Figure 29  Typical main burner flame

1.Yellow-orange streaks may appear (caused by dust).

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 temperature?

3.Thermostat set below room tempera- ture?

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 Troubleshoot- ing, section 11 of this manual.

Part Number 550-110-710/0107 35