Lennox G24-200 User Manual

Page 8
Flue And Chimney
Check the flue pipe, chimney and all connections for tight
ness and to make sure there is no blockage.
Heat Exchangers (Both)
Periodically inspect the heat exchanger tubes and flue box
for corrosion. If necessary, clean as indicated below:
1 − Turn off the electrical and gas supply to the furnace.
2 − Disconnect the wiring to the combustion air fan.
3 − Remove the screws securing the flue box to the fur
nace. Clean the flue box with a wire brush (brass
bristle brush recommended).
4 − Disconnect the gas supply piping and the ignitor and
sensor wires. Remove the burner assembly from the
furnace.
5 − Pull a largebore wire brush (brassbristle brush recom
mended) through each heat exchanger tube to clean.
6 − Reinstall the flue box using a new gasket.
7 − Reconnect the combustion air fan wiring.
8 − Reinstall the burner box, ignitor and sensor wires and
the gas supply piping.
9 − Follow step 10 in the burners section above.
Electrical
1 − Check all wiring for loose connections.
2 − Check for the correct voltage at the furnace (furnace
operating).
3 − Check ampdraw on blower motor.
Motor service factor amps
Nameplate __________Actual__________
Repair Parts List
The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete
furnace model number listed on the CSA international. rating plate  Example: G24−200. Refer to page 4 and 5 for parts
identification.
Cabinet Parts Electrical Parts Heating Parts Blower Parts
Front louver door (2) Transformer(s) Heat exchanger (2) Wheel (2)
Blower access panel (2) Ignition control board (2) Main burners Motor
Cabinet cap Door interlock (2) Main burner orifices Cutoff plate (2)
Cabinet toprear Ignition cable (2) Gas manifold/burner
box assembly (2)
Shaft
Cabinet bottomrear Ignitor (2) Gas valve (2) Motor pulley
Flue adapter (2) Flame sensor (2) Flue box (2) Wheel pulley
Rollout switch (2) Combustion air blower (2) Belt
Primary limit (2) Flexible gas connector Bearing (2)
Pressure switch (2) Vibration isolators (4)
Blower timing control board Locating rods (2)
Accessory relay
Blower operation relays
Contactor
Combustion air blower
operation relays

Lennox G24-200 Specifications

General

Brand	Lennox
Model	G24-200
Category	Furnace
Language	English