Lennox MERIT Series Installation Instructions Manual page 14

HORIZONTAL LEFT POSITION
Top Vent Discharge
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.
Figure 19
HORIZONTAL LEFT POSITION
Side Vent Discharge
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.
Figure 20
AIR
FLOW
Collector Box
AIR
FLOW
Collector Box
Page 14
HORIZONTAL RIGHT POSITION
Top Vent Discharge
vent pipe
flue transition
AIR
FLOW
Gas supply piping must be brought into the unit from the bottom
in order to accommodate the flue pipe.
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 by either pulling excess wires
through the blower compartment and securing with supplied
wire tie, or coil excess wire and secure to the gas manifold.
Figure 21
HORIZONTAL RIGHT POSITION
Side Vent Discharge - no modifications necessary
Make-Up Box
AIR
FLOW
Figure 22
pressure switch
cover plate
collector box
make-up box
Pressure Switch
Vent Pipe
Flue Transition
Collector Box