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Figure 24 − Field−Supplied Electrical Box on Furnace
12. Complete electrical box wiring and installation. Connect
line voltage leads as shown in Figure 24. Use best prac-
tices (NEC in U.S. for wire bushings, strain relief, etc.
13. Reinstall cover to J−Box. Do not pinch wires between cov-
er and bracket.
Power Cord Installation in Furnace J−Box
NOTE: Power cords must be able to handle the electrical
requirements listed in Table 5. Refer to power cord
manufacturer's listings.
1. Remove cover from J−Box.
2. Route listed power cord through 7/8−in. (22 mm) diameter
hole in J−Box.
3. Secure power cord to J−Box bracket with a strain relief
bushing or a connector approved for the type of cord used.
4. Secure field ground wire to green ground screw on J−Box
bracket.
5. Connect line voltage leads as shown in Figure 25.
6. Reinstall cover to J−Box. Do not pinch wires between cov-
er and bracket.
BX Cable Installation in Furnace J−Box
1. Remove cover from J−Box.
2. Route BX cable into 7/8−in. (22 mm) diameter hole in
J−Box.
20
Casing
Specifications are subject to change without notice.
3. Secure BX cable to J−Box bracket with connectors ap-
proved for the type of cable used.
4. Secure field ground wire to green ground screw on J−Box
bracket.
5. Connect line voltage leads as shown in Figure 25.
6. Reinstall cover to J−Box. Do not pinch wires between cov-
er and bracket.
24−V Wiring
Make field 24−v connections at the 24−v terminal strip. (See
Figure 25 − Figure 33) Connect terminal Y/Y2 as shown in
Figure 27 − Figure 33 for proper cooling operation. Use only
AWG No. 18, color−coded, copper thermostat wire.
The 24−v circuit contains an automotive−type, 3−amp. fuse
located on the control. Any direct shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3−amp. fuse of identical
size.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) us-
ing 1/4−in female quick connect terminals to the two male
1/4−in quick−connect terminals on the control board
marked EAC−1 and EAC−2. The terminals are rated for
115VAC, 1.0 amps maximum and are energized during
blower motor operation. (See Figure 26)
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp. maximum humid-
ifier (if used) to the 1/4−in male quick−connect HUM ter-
minal and COM−24V screw terminal on the control board
thermostat strip. The HUM terminal is energized when
blower is energized in heating. (See Figure 26)
NOTE: DO NOT connect furnace control HUM terminal to H
terminal on humidity sensing thermostat, or similar device. See
the humidity sensing thermostat, instructions for proper
connection.
VENTING
The furnace shall be connected to a listed factory built
chimney or vent, or a clay−tile lined masonry or concrete
chimney. Venting into an unlined masonry chimney or
concrete chimney is prohibited.
When an existing Category I furnace is removed or replaced,
the original venting system, may no longer be sized to properly
vent the attached appliances. An improperly sized Category I
venting system could cause the formation of condensate in the
furnace and vent, leakage of condensate and combustion
products, and spillage of combustion products into the living
space.
441 01 2122 01
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