Page 5
UPFLOW FURNACE
SIDE RETURN AIR
FIGURE 5
DOWNFLOW FURNACE
FILTERS IN PLENUM RACK
FIGURE 6
Blower
Check and clean blower wheel for any debris. Blower
motor is prelubricated for extended bearing life. No
further lubrication 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 80MGF burner flame is not adjustable; however,
the flame should be inspected at the beginning of
each heating season and burners should be cleaned,
if necessary. Burner flame should be blue when burnĆ
ing 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 7
Venting System Inspection
Annually (before heating season) inspect furnace
venting system, vent cap, heat exchanger and burnĆ
ers for corrosion, deterioration, or deposits of debris.
Remove any obstructions.
Contact your Lennox dealer for a periodic unit inspecĆ
tion 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 furnace 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 operation. Contact a qualified service technician.
Service Reminder
Call your Lennox service technician if unit is inoperaĆ
tive. Before calling, always check the following to be
sure service 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 operatĆ
ing condition year after year, contact your independent
Lennox dealer about a planned service program.
