16
Before using Table 4, the number of pipes (1-pipe or 2-pipe)
connected to the furnace must be known. Find the proper
furnace style (upflow, horizontal, or downflow) and then the
side that the pipes will exit from the furnace. Finally select
the option that properly matches your installation type. For
*SC & *SL series, Figure 38, Figure 39, Figure 40, Figure 41,
or Figure 42. For *SD & *SM series, see Figure 43, Figure 44,
Figure 45, or Figure 46.
NOTE: It is important that Direct Vent (2-pipe) systems
maintain an airtight flow path from the air inlet to the flue
gas outlet. The furnace ships from the factory with two holes
in the cabinet for the air inlet and flue gas outlet. In certain
configurations, it is necessary to remove and relocate a plastic
plug in the furnace cabinet. If changing the position of the air
inlet and flue gas outlet, it is required that the previous hole
be closed off with the plastic plug to maintain air tightness
in the furnace. The hole locations for all furnace series are
shown in Figure 32 and Figure 33.
Inducer Assembly Rotation
WARNING:
Inducer rotation must be completed before
the furnace is connected to gas and electric. If
both utilities have been connected, follow the
shutdown procedures printed on the furnace
label and disconnect the electrical supply.
*SD & *SM SERIES - CONVENTIONAL (1 PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
DOWNFLOW
Right Option 21 N/A N/A Option 29
Up N/A Option 25 Option 26 Option 30
Left Option 22 N/A N/A Option 31
*SD & *SM SERIES - DIRECT VENT (2-PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
DOWNFLOW
Right Option 23 N/A N/A Option 32
Up N/A Option 27 Option 28 Option 33
Left Option 24 N/A N/A Option 34
Table 4. Vent & Inducer Blower Options
*SC & *SL SERIES - CONVENTIONAL (1 PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
DOWNFLOW
Up Option 1 Option 7 Option 10 Option 15
Right Option 2 Option 8 N/A Option 16
Left Option 3 N/A Option 9 Option 17
*SC & *SL SERIES - DIRECT VENT (2-PIPE)
VENT
DIRECTION
UPFLOW
HORIZONTAL
RIGHT
HORIZONTAL
LEFT
DOWNFLOW
Up Option 4 Option 12 Option 14 Option 18
Right Option 5 Option 11 N/A Option 19
Left Option 6 N/A Option 13 Option 20
CAUTION:
It is good practice to label all wires prior to
disconnection. Wiring errors can cause improper
and dangerous operation.
1. Disconnect the electrical harness from the inducer
assembly.
2. Remove the inducer assembly ground wire from the blower
deck.
3. Remove 3 screws securing the inducer assembly to the
header box.
4. Rotate the inducer assembly to its new position.
5. Secure the inducer assembly to the header box by
reinstalling the three screws. If the inducer assembly is
rotated to the left or right side of the furnace, use the extra
screw provided in the parts package.
6. Remove the cabinet plug from side of furnace and reinstall
in hole on opposite side of cabinet.
7. Install in-line drain assembly and tubing.
8. Install all condensate drain lines. For *SC & *SL series,
refer to Figure 38, Figure 39, Figure 40, Figure 41, or Figure
42. For *SD & *SM series, refer to Figure 43, Figure 44,
Figure 45, or Figure 46.
9. Reconnect the electrical harness to the inducer assembly.
10. Reconnect the inducer assembly ground wire to the blower
deck or door.
11. Verify operation as detailed on the furnace label.
Pressure Switch Tubing
All upflow / horizontal furnaces have two switches, one
connected to the static tap on the inducer assembly and
the other to the collector box. Figure 14 & Figure 15 display
the proper routing of pressure switch tubing for *SC & *SD
furnaces. Downflow (*SL & *SM) furnaces require only one
switch connected to the inducer’s static tap as shown in
Figure 16 (page 17).
Alternate Pressure Switch Location
In some inducer orientations, the inducer pressure switch may
interfere with gas pipe installation. Determine the side of the
cabinet the gas pipe will enter and see if the inducer pressure
switch needs to be moved. If the pressure switch interferes
with the gas pipe, use these instructions for relocating it to
an alternate location:
1. Shut off any electrical power to the furnace.
2. Label and disconnect the tubing and wires from the pressure
switch (Figure 17 (page 17)).
3. Remove two screws securing the pressure switch to the
inducer housing.
4. Remove the pressure switch from the mounts on the
inducer housing and relocate it to the other set of mounts
90° from previous location.
5. Secure the pressure switch with two screws.
6. Reconnect the tubes and wires to the pressure switch.
Accessories
The components below are included in the extra parts bag
that is supplied with the purchase of your furnace. Depending
on your particular installation, some of these components are
optional and may not be used. Please refer to the descriptions
and accompanying figures when installing these items.
NOTE: Some parts may not be supplied with each furnace.
Refer to the literature in the extra parts bag for the parts
included with the particular furnace.
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