Lennox Merit Series Installation Instructions Manual page 8

HORIZONTAL LEFT POSITION
Top Vent Discharge
Vent Pipe
Pressure
Switch
Flue
Transition
Cover Plate
Make−Up Box
Disconnect pressure switch hose from barbed tting 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 ori ce 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 6
HORIZONTAL LEFT POSITION
Side Vent Discharge
Pressure Switch
Vent Pipe
Make−Up Box
Cut combustion air inducer tubing from 225mm to 125mm
to avoid interference with inducer motor
Disconnect pressure switch hose from barbed tting 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 ori ce 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 7
8
VENTING
AIR
FLOW
Collector Box
AIR
FLOW
Collector Box
HORIZONTAL RIGHT POSITION
Top Vent Discharge
Vent Pipe
Flue
Transition
AIR
FLOW
Gas supply piping must be brought into the unit from the bot-
tom in order to accommodate the ue pipe.
Cut combustion air inducer tubing from 225mm to 125mm
to avoid interference 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 8
HORIZONTAL RIGHT POSITION
Side Vent Discharge
Make−Up Box
AIR
FLOW
FIGURE 9
Pressure Switch
Cover Plate
Collector Box
Make−Up Box
Pressure Switch
Flue Transition
Collector Box