Lennox EL180UHE Installation Instructions Manual page 13

UPFLOW POSITION
Left Side Vent Discharge
Cover Plate
Pressure
Switch
Vent Pipe
Flue
Transition
AIR
Gas supply piping must be brought into the unit from the right
side in order to accommodate the flue pipe.
ference with inducer motor
Remove make-up box assembly (2 screws) and cut wire tie to
free make-up box wires. Re-install make-up box on other side
of cabinet.
Re-secure make-up box wires: Either pull excess wires
through the blower compartment and secure using supplied
wire tie, or coil excess wire and secure to the gas manifold.
Figure 16
UPFLOW POSITION
Right Side Vent Discharge
Cover Plate
Collector Box
Pressure
Switch
Make-Up
Box
AIR
Cut combustion air inducer tubing from 9" to 5" to avoid
interference with inducer motor
Figure 17
Collector Box
Make-Up
Box
FLOW
Flue Transition
Vent Pipe
FLOW
HORIZONTAL LEFT POSITION
Vent Pipe
Pressure
Switch
Flue
Transition
Cover Plate
Make-Up Box
Disconnect pressure switch hose from barbed fitting on the
pressure switch assembly. Remove pressure switch assembly
(1 screw) and cut wire tie to free pressure switch wires. Re-
install pressure switch on the other side of orifice plate and re-
connect pressure switch hose.
Re-secure pressure switch wires: Either pull excess wires
through the blower compartment and secure using supplied
wire tie, or coil excess wire and secure to the gas manifold.
HORIZONTAL LEFT POSITION
Pressure Switch
Vent Pipe
Make-Up Box
ference with inducer motor
Disconnect pressure switch hose from barbed fitting on the
pressure switch assembly. Remove pressure switch assembly
(1 screw) and cut wire tie to free pressure switch wires. Re-
install pressure switch on the other side of orifice plate and re-
connect pressure switch hose.
Re-secure pressure switch wires: Either pull excess wires
through the blower compartment and secure using supplied
wire tie, or coil excess wire and secure to the gas manifold.
Page 13
Top Vent Discharge
Figure 18
Side Vent Discharge
Collector Box
Figure 19
AIR
FLOW
Collector Box
AIR
FLOW