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A 40 VA transformer and an integrated electronic control
are built into the furnace to allow use with most cooling
equipment.
CAUTION
To avoid the risk of electrical shock, wiring
to the unit must be properly polarized and
grounded.
To provide more reliable sensing of flame, the
ground wire
must run to the electrical panel.
Line voltage wiring
must enter into the junction box pro-
vided with the furnace.
As shipped, the junction box is attached to the left side of the
furnace (as viewed for an upflow installation). If this is
suitable for your installation, no changes are necessary.
If the line voltage wiring is to enter through the right side of
the furnace (as viewed for an upflow installation), relocate
the junction box as shown in Figure 18.
Junction Box
(Cover Removed)
Figure 18
Junction Box (Horizontal Right)
WARNING
To prevent death or personal injury due to
electric shock, disconnect electrical power.
1. Remove both doors from the furnace.
2. Remove and save the screws holding the junction box
to the left side of the furnace.
3. Disconnect the hose from the pressure switch assem-
bly. Leave the other end attached to the induced draft
blower.
4. Remove four wires to the pressure switch assembly.
5. Remove and save the screws holding the pressure
switch bracket to the right side of the furnace.
6. Remove wires entering junction box from split grommet
in blower deck.
7. Swap locations of the two bushings in the junction box.
8. Rotate the junction box 180° so the access panel
continues to face forward. The open snap bushing
should be on the left.
9. Attach pressure switch bracket to left side of furnace
where the junction box was using the screws saved in
Step 5. The “L” bracket must point toward the front of
the furnace. Reroute pressure switch wires through the
split grommet on the left side of the blower deck.
Reconnect wires using the wiring diagram inside the
blower door.
10. Reroute remaining wires through split grommet on the
right side of the blower deck.
11. Insert remaining wires through the open bushing in the
bottom of the junction box.
12. Attach junction box to the right side of the furnace using
the screws removed in Step 2.
13. Reconnect hose to pressure switch assembly.
14. Check the location of the pressure hose and all wiring.
Ensure the hoses will not be damaged by heat from the
burners or by the rotation of the fan. Also ensure all
wiring will not interfere with filter removal or other
maintenance.
After the junction box is in the desired location, use washers
to connect field-supplied conduit to the junction box in
accordance with NEC and local codes. Connect hot, neu-
tral, and ground wires as shown in the furnace wiring
diagram. The wires and ground screw are located in the
furnace junction box.
Low voltage wiring may enter through the right or left side
of the furnace (as viewed for an upflow installation - top or
bottom for a horizontal installation). See Specification Sheet
for hole locations. Run the thermostat wires through either
hole and down through a grommet in the blower deck.
Low voltage wires may be connected to the terminal strip as
shown in Figure 19.
IMPORTANT NOTE:
To avoid possible equipment
malfunction, route the low voltage wires to avoid interference
with filter removal or other maintenance.
Heating Fan
Off Adjustments
Low Voltage
Terminals
ON
OF
F
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Figure 19
Integrated Ignition Control
(Viewed in an Upflow Installation)
