18
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.
Low voltage wires may be connected to the terminal strip as
shown in Figure 23.
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
Figure 23
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 24).
HEAT ANTICIPATOR SETTING
Adjust the heat anticipator in the room to obtain the proper
number of heating cycles per hour. The heat anticipator is
a wire-wound adjustable heater that prevents the room
temperature from “overshooting” the room thermostat set-
ting. The heat anticipator must be set at 0.7 amps. The heat
anticipator is part of the thermostat. If the thermostat fails
for any reason, replace the thermostat.
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 24
Heating Fan Off Adjustments
LINE VOLTAGE CONNECTION FOR OPTIONAL
HUMIDIFIER AND ELECTRONIC AIR CLEANER
The control module is equipped with line voltage accessory
terminals used for controlling the power to an optional field-
supplied humidifier and/or electronic air cleaner.
Accessory Load Specification
Air Cleaner: 1.0 Amp max. at 120 VAC
Humidifier: 1.0 Amp max. at 120 VAC
Accessory Installation:
Follow the electronic air cleaner and humidifier manufactur-
ers’ instructions for mounting and electrically grounding
these accessories. Check that the power supply to the
furnace has been disconnected. Wire the accessories to
the control module as shown below. All connections to the
control module are to be made through 1/4 inch female
terminals.
If it is necessary to supply additional line voltage wiring to
the interior of the furnace, the wiring must comply with all
