Lennox SL280UH090V36B Installation Instructions Manual page 14

UPFLOW POSITION
Right Side Vent Discharge
cover plate
collector box
pressure
switch
make-up
box
Pressure switch tubing may be too long. Cut to
fit , then re-attach to barbed fitting on pressure
switch. Tubing must not be allowed to sag.
FIGURE 18
HORIZONTAL LEFT POSITION
Top Vent Discharge
vent pipe
flue
transition
cover plate
make-up box
Disconnect
sure 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 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 19
flue transition
vent pipe
FLOW
AIR
pressure switch
AIR
FLOW
collector box
HORIZONTAL LEFT POSITION
flue transition
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 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.
HORIZONTAL RIGHT POSITION
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.
Page 14
Side Vent Discharge
pressure switch
collector box
make-up box
FIGURE 20
Top Vent Discharge
pressure switch
collector box
make-up box
FIGURE 21
AIR
FLOW
cover plate