LGB
Gas-Fired Boiler — Boiler Manual
Part Number 550-141-186/0100
30
Inspect base
insulation
1. Make sure base insulation is secure against all four base panels.
Working with
base insulation
Check pilot
burner flame
Check main
burner flames
See Figure 24.
1. Proper pilot flame:
a. Blue flame.
b. Inner cone engulfing sensor.
2. Improper pilot flame:
a. Overfired — flames large and lifting or blowing
past sensor.
b. Underfired — flames small; sensor not engulfed
by inner cone.
See Figure 25.
1. Check main burner flames at least once a month during heating season.
2. Proper burner flame:
a. Yellow-orange streaks may appear - caused by dust.
3. Improper flame:
a. Overfired — Flames large.
b. Underfired — Flames small.
c. Lack of primary air — Yellow tipping on flames; sooting will occur.
Figure 24
Typical pilot
burner flame
Figure 25
Typical main
burner flame
10c
Maintenance —
procedures
Inner cone
Typical
pilot
burner
186-24
Transparent
blue flame
Transparent
blue flame
Inner cone
Inner cone
186-25
If base insulation material is damaged or displaced, call service technician
immediately. Do not operate boiler. Operating boiler with damaged or
displaced base insulation can result in severe personal injury, death or
substantial property damage.
Ceramic fiber material used in base insulation can cause temporary skin,
eye and upper respiratory irritation. Refer to
Warning
regarding insulation
materials on page 28.
