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UPFLOW FURNACE SIDE RETURN AIR
FIGURE 4
DOWNFLOW FURNACE
FILTERS IN PLENUM RACK
FIGURE 5
Blower
Check and clean blower wheel for any debris. Blower moĆ
tor is prelubricated for extended bearing life. No further luĆ
brication is needed.
WARNING
Blower door must be securely in place when blower
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 G27M burner flame is not adjustable; however, the
flame should be inspected at the beginning of each heatĆ
ing season and burners should be cleaned, if necessary.
Burner flame should be blue when burning natural gas.
BURNER FLAME
BURNER
FLAME
HEAT
EXCHANGER
TUBE
VEST
PANEL
FLAME APPEARS BLUE IF
BURNING NAT. GAS.
FIGURE 6
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 service technician.
Flame Rollout Safety Switches
Your Lennox furnace is equipped with two flame roll-out
safety switches which shut off the gas supply to the furĆ
nace in case of heat exchanger blockage. If the furnace
fails to operate due to the functioning of these safety
switches, DO NOT attempt to place the furnace into opĆ
eration. Contact a qualified service technician.
Service Reminder
Call your Lennox service technician if unit is inoperative.
Before calling, always check the following to be sure serĆ
vice is required.
1 - Check that electrical disconnect switches are ON.
2 - Are access panels securely in place?
3 - Check room thermostat for proper setting.
4 - Replace any blown fuses or reset circuit breakers.
5 - Gas valve should be ON.
6 - Air filter should not be plugged limiting air flow.
7 - Is gas turned on at meter?
8 - Is manual main shutĆoff valve open?
To keep your Lennox gas heating system in peak opĆ
erating condition year after year, contact your indeĆ
pendent Lennox dealer about a planned service proĆ
gram.