User’s Information Manual
9
Part Number 550-142-801/1112
Figure 4
Automatic air
vent
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 flame.
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. 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
Proper
main burner flame (see
Figure 6
):
1. Yellow-orange streaks may appear (caused by dust).
Improper
main burner flame:
1. Overfired — Large flames.
2. Underfired — Small flames.
3. Lack of primary air — Yellow tipping on flames
(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 fittings and tubing. Verify
that condensate can flow freely to drain.
