Weil-McLain CGt 2 Series Manual page 32

CGt
GAS-FIRED WATER BOILER — Series 2 —
7b
Start-up — operate boiler
Check burner flames
View pilot and main flames through the inspection port
in the base burner shield.
Pilot burner flame (Figure 25)
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 26)
PROPER main burner flame characteristics:
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 temperature?
4. Gas not turned on at meter or boiler?
5. Incoming gas pressure less than 5" w.c. for natural gas?
32
Boiler Manual
(continued)
Figure 25 Typical pilot burner flame
Figure 26 Typical main burner flame
6. If none of the preceding corrects the problem,
refer to Troubleshooting
manual.
, Section 12 of this
If the boiler water temperature is
below tankless heater low limit
setting, boiler can be started
even if thermostat is set above
room temperature.
Part Number 550-110-290/0219