Weil-McLain 550-110-260/02002 manual 7b Start-up— operate boiler continued, Check burner flames

Boiler Manual

7b Start-up — operate boiler continued

4.Check around the boiler for gas odor following the procedure of section 7a of this manual.

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 corrected. Failure to comply could result in severe personal injury, death or substantial property damage.

Figure 16 Typical pilot burner flame

Inner

Sparkcone electrode

Check burner flames

View pilot and main flames through the inspection port in the Air inlet box front cover.

Pilot burner flame

Proper pilot flame characteristics (see Figure 16):

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.

Pilot flame sensor

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Figure 17 Typical main burner flame

Main burner flame

Proper main burner flame characteristics (see Figure 17):

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).

Transparent blue flame

Inner flame

26024

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 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?

If none of the above corrects the problem, refer to Troubleshooting, section 11 of this manual.

Part number 550-110-260/0200 29