Lennox EL180UHE Series Manual page 16

Multiple Venting
The EL180UHE(X) furnace can vent in multiple positions.
See figure 11.
The make up box may be removed and the combustion air
inducer may be rotated clockwise or counterclockwise 90°
to allow for vertical or horizontal vent discharge in a vertical
or horizontal cabinet position. Remove the four mounting
Pressure
Switch
vent pipe
In all positions route the wires away from moving parts and the heat of the inducer
motor to prevent damage to the wires. The pressure switch must be installed above
the CAI to prevent moisture from collecting in the hoses or switch.
Vent Pipe
Collector Box
FLOW
AIR
vent pipe
flue transition
AIR
FLOW
screws, rotate the assembly (assembly consists of orifice
plate, proving switch, gasket and combustion air inducer),
then reinstall the mounting screws. See unit Installation In­
structions for more detail.
The combustion air pressure switch must be moved
for horizontal discharge air left position.
flue
transition
vent pipe
vent pipe
Collector Box
pressure switch
vent pipe
FIGURE 11
Page 16
IMPORTANT
vent pipe
Pressure
Switch
AIR
FLOW