User Guide

10
Part Number 550-142-301/0420
CGa, CGi, EG, PEG, & LGB Gas-Fired Boilers
Automatic air vents (if used)
1. SeeFigure 4.
2. Remove the cap from any automatic
air vent in the system and check
operation by depressing valve B
slightly with the tip of a screwdriver.
3. If the air vent valve appears to be
working freely and not leaking,
replace cap A, twisting all the way
on.
4. Loosen cap A one turn to allow vent
to operate.
5. Have vent replaced if it does not
operate correctly.
Pilot burner flame
Proper pilot flame (see Figure 5):
1. Blueame.
2. Inner cone engulfing thermocouple or thermopile (standing
pilot) or pilot flame sensor (spark-ignited pilot).
3. Thermocouple or thermopile, or pilot flame sensor glowing
cherry red.
Improper pilot flame:
1. Overred— Large ame lifting or blowingpastpilotame
sensor.
2. Underred—Smallame.Innerconenotengulngpilotame
sensor.
3. Lackofprimaryair—Yellowametip.
4. Incorrectly heated pilot flame sensor.
Main burner flame
Proper main burner flame (see Figure 6):
1. Yellow-orangestreaksmayappear(causedbydust).
Improper main burner flame:
1. Overred—Largeames.
2. Underred—Smallames.
3. Lackof primary air —Yellowtippingonames
(sooting will occur).
Figure 5 Pilot burner and flame, typical
Figure 6 Main burner flame, typical
❏ Check monthly . . . . . . . . . . . . . . . .
Check condensate drain
system (if used)
1. Inspectcondensatedrainttingsandtubing.Verify
that condensate can flow freely to drain.
Figure 4
Automatic air vent
User maintenance procedures (continued)