Weil-McLain EG Manual page 26

EG PEG EGH
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Start-up
(continued)
If boiler doesn't start . . . Check for:
1. Loose connections, blown fuse or service switch off?
2. High limit switch set below boiler pressure?
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, see
"Troubleshooting" in the Control Supplement.
Verify operation
Check burner flame — Pilot burner
1. Proper pilot flame (see Figure 28):
a. Blue flame.
b. Inner cone engulfing thermocouple.
c. Thermocouple glowing cherry red.
2. Proper pilot flame:
a. Overfired — Large flame lifting or blowing past
thermocouple.
b. Underfired — Small flame. Inner cone not engulfing
thermocouple.
c. Lack of primary air — Yellow flame tip.
d. Incorrectly heated thermocouple.
Check burner flame — Main burner
1. Proper main burner flame (see Figure 29):
a. Yellow-orange streaks may appear (caused by dust).
2. Improper main burner flame:
1. Overfired — Large flames.
b. Underfired — Small flames.
c. Lack of primary air — Yellow tipping on flames (sooting
will occur).
Check vent damper operation
1. Raise room thermostat to call for heat — Vent
damper actuator will slowly open vent damper.
2. When vent damper is fully open — Main gas valve
will open and main burners will ignite.
Vent damper must be fully open before
main burners light. If vent damper does
not fully open, flue products such as
carbon monoxide will escape into house,
causing severe personal injury or death.
3. Lower thermostat setting — Main burner flames
will go out, then vent damper will close.
26
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Gas firEd boilErs
— 4 —
sEriEs boilEr manual
Figure 28
Typical pilot burner flame
Figure 29
Typical main burner flame
4. Repeat Steps 2 through 4 several times to verify
operation.
5. Return thermostat to normal setting.
6. Set thermostat heat anticipator setting indicated on
wiring diagram.
Check venting system operation
With boiler firing, hold a candle or match below lower
edge of draft diverter "skirt." If flame does not blow
out, but burns undisturbed, the vent system is working
properly. If flame blows out or flickers severely, the vent
system must be checked for obstructions or other causes
of improper venting.
Part Number 550-110-639/0512