17
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. Leave
the other end attached to the induced draft blower.
4. Remove five wires entering junction box from split
grommet in blower deck.
5. Swap locations of the two bushings in the junction box.
6. Rotate the junction box 180 degrees so the access
panel continues to face forward. The open snap bush-
ing should now be at the bottom.
7. Insert five wires into the split grommet on the right side
of the blower deck.
8. Insert the five wires through the open bushing in the
bottom of the junction box.
9. Attach the junction box to the right side of the furnace,
using the screws removed in step 2.
10. Reconnect the hose to the pressure switch.
11. Check the location of the pressure hose and all wiring.
Confirm that it will not be damaged by heat from the
burners or by the rotation of the fan. Also confirm that
wiring location 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
grommet in the blower deck (Figure 21).
Low voltage wires may be connected to the terminal strip as
shown in Figure 22.
IMPORTANT NOTE: To avoid possible equipment mal-
function, route the low voltage wires to avoid interference
with filter removal or other maintenance.
Heating Fan
Off Adjustments
Low Voltage
Terminals
OR
ON
OF
F
12
B1
B2
B3
B4
Pins (4)
Jumper
Style A
Style B
Figure 22
Integrated Ignition Control
(Viewed in an Upflow Installation)
AIR CIRCULATION BLOWER FAN TIMING
All items in this section refer to the air circulation blower fan,
not to the induced draft blower. The timing sequence for the
induced draft blower is not adjustable.
When a call for cooling occurs, the circulation fan will come
on. It will remain on for 45 seconds after the call for cooling
ends. This fan timing is not adjustable.
During normal heating operation, the circulation fan will
come on 37 seconds after the gas valve opens. This timing
is not adjustable.
As shipped, the circulation fan will remain on for 90 seconds
after the gas valve closes. If desired, this timing may be
adjusted. The adjustment pins or switches are near the low
voltage terminal strip (Figure 23).
60
Second
Delay
12
ON
OF
F
B1
B2
B3
B4
90
Second
Delay
12
ON
OF
F
B1
B2
B3
B4
120
Second
Delay
12
ON
OF
F
B1
B2
B3
B4
180
Second
Delay
12
ON
OF
F
B1
B2
B3
B4
Style A
Style B
Switches viewed in an upflow installation.
Figure 23
Heating Fan Off Adjustments
