Page 21
To clean burners:
1 -- Turn off both electrical and gas power supplies to
furnace.
2 -- Disconnect gas supply piping and remove gas
manifold.
3 -- Disconnect ignitor and flame sensor leads.
4 -- Remove burner tray and burners.
5 -- Clean burner retention ring with wire brush.
6 -- Use test tube brush to clean inside of each burner.
7 -- Replace burners and burner tray, making sure
burners are properly seated in slots on tray and ori-
fice in manifold.
8 -- Reinstall burner box and gas supply piping. Recon-
nect ignitor and flame sense leads.
9 -- Carefully check all piping connections (factory and
field) for gas leaks. Use a leak detecting solution or
other preferred means.
10 -- Restore electrical power and gas supply. Follow
lighting instructions on front of unit.
CAUTION
Potential for gas leaks, fire or explosion.
Some soaps used for leak detection are corrosive
to certain metals. Carefully clean piping thor-
oughly after leak detection has been completed.
Can cause damage to piping resulting in gas
leaks, fire or explosion.
C--Supply Air Blower
1 -- Check and clean blower wheel.
2 -- Motors used on the Lennox G24M series units
are permanently lubricated and need no further
lubrication.
D--Flue and Chimney
Flue must conform to all AGA/GAMA venting require-
ments. Flue pipe deteriorates from the inside out and
must be disconnected in order to check thoroughly.
Check flue pipe, chimney and all connections for tight-
ness and to make sure there is no blockage or leaks.
E--Electrical
1 -- Check all wiring for loose connections.
2 -- Check for correct voltage.
3 -- Check amp--draw on blower motor.
FIGURE 24
HEAT EXCHANGER REMOVAL (unit shown in horizontal position)
REMOVE SCREWS (4)
SLIDE ENTIRE ASSEMBLY OUT OF CABINET
Front
Right
Top
Bottom
Left
Back