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Page 13
Venting
A 4−inch diameter flue transition is factory-installed on the
combustion air inducer outlet of all models. Figure 16
shows the combustion air inducer as shipped from the
factory.
FIGURE 15
Mounting Screws Location
Mounting Screws
UPFlow Position
FIGURE 16
UPFLOW POSITION
Top Vent Discharge
FLOW
AIR
Pressure
Switch
Flue
Transition
Vent Pipe
Collector Box
Make−Up
Box
IMPORTANT
The unit will not vent properly with the flue transition
pointed down in the 6 o’clock position.
The combustion air inducer may be rotated clock-
wise or counterclockwise by 90° to allow for top or
side vent discharge in all applications. When the unit
is installed, the flue transition must be in the 9
o’clock, 12 o’clock or 3 o’clock position.
If necessary reposition the combustion air inducer, pres-
sure switch and or make up box as needed per the follow-
ing steps and see figures 17 through 22.
1 − Remove the four mounting screws which secure the
combustion air inducer / pressure switch assembly to
the orifice plate. See figure 15. Lift and rotate the as-
sembly 90 degrees clockwise or counter clockwise to
either the 3 o’clock position or to 9 o’clock position and
re−secure with four screws. Gasket should be left in
place.
2 − Use tin snips to cut preferred opening on the cabinet
for repositioning the flue outlet. Use the cut out piece
as a cover plate to patch unused opening on cabinet.
UPFLOW POSITION
Left Side Vent Discharge
FIGURE 17
S Gas supply piping must be brought into the unit from the right
side in order to accommodate the flue pipe.
S 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.
S Re−secure make−up box wires, either pulling excess wires
through the blower compartment and securing with supplied
wire tie, or coil excess wire and secure to the gas manifold.
FLOW
AIR
Cover Plate Collector Box
Pressure
Switch
Vent Pipe
Flue
Transition
Make−Up
Box
UPFLOW POSITION
Right Side Vent Discharge
FIGURE 18
S 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.
FLOW
AIR
Collector
Box
Cover Plate
Flue Transition
Vent Pipe
Pressure
Switch
Make−Up
Box