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UPFLOW FURNACE
SIDE RETURN AIR
FIGURE 3
Fan
Check and clean fan wheel for any debris. Fan motor is
prelubricated for extended bearing life. No further lubricaĆ
tion is needed.
WARNING
Fan door must be securely in place when fan and
burners are operating. Gas fumes, which could
contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
Burner Flame
The G24MCE burner flame is not adjustable; however,
the flame should be inspected at the beginning of each
heating season and burners should be cleaned, if necesĆ
sary. Burner flame should be blue when burning natural
gas, blue/yellow when burning propane gas.
BURNER FLAME
BURNER
FLAME
HEAT
EXCHANGER
TUBE
VEST
PANEL
FLAME APPEARS BLUE IF
BURNING NAT. GAS; BLUE/
YELLOW FOR PROPANE.
FIGURE 4
Venting System Inspection
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger and burners for corroĆ
sion, deterioration, or deposits of debris. Remove any obĆ
structions.
Contact your Lennox dealer for a periodic unit inspection
by a qualified gas service engineer.
Capillary Tube Limit Switch
Your Lennox furnace is equipped with a manuallyĆreset
capillary tube limit switch which shuts off the gas supply to
the furnace in the event of inadequate supply air (high air
temperature). It is located on the vestibule panel near the
gas valve. To reset this control, push the switch on the
face of the control sideways. If this switch opens again,
consult a qualified gas service engineer.
Control Board Lockouts
Several types of control board lockout modes exist on this
furnace. When in one of these modes, the control board
will not allow the furnace to start. The two modes that can
be manually reset are: a Watchguard lockout mode," and
a Hard lockout mode."
To reset the Watchguard mode," manually switch the therĆ
mostat from HEAT to OFF and then back to HEAT again.
(Note - This lockout mode will also automatically reset after
a 60 minute lockout period.)
The Hard lockout mode" can be reset by turning the elecĆ
trical power OFF and then back ON again.
If either of these two lockouts reoccur, or if the original lockĆ
out cannot be reset, call a qualified gas service engineer.