International comfort products N8MXL Installation Instructions Manual page 21

POWER CORD INSTALLATION IN FURNACE J−BOX
NOTE: Power cords must be able to handle the electrical
requirements listed in Table 7. Refer to power cord
manufacturer's listings.
1. Remove cover from J−Box.
2. Route listed power cord through 7/8−in. (22 mm) dia-
meter 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 26.
6. Reinstall cover to J−Box. Do not pinch wires between
cover and bracket.
BX CABLE INSTALLATION IN FURNACE J−BOX
1. Remove cover from J−Box.
2. Route BX cable into 7/8−inch diameter hole in J−Box.
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 26 .
6. Reinstall cover to J−Box. Do not pinch wires between
cover and bracket.
24−V WIRING
Make field 24−v connections at the 24−v terminal strip. (See
Figure 24) Connect terminal Y/Y2 as shown in Figure 25 for
proper cooling operation.
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.
441 01 1421 01
Use only AWG No. 18,
Specifications are subject to change without notice.
ACCESSORIES
1. Electronic Air Cleaner (EAC):
Connect an accessory Electronic Air Cleaner (if used)
using 1/4−in female quick connect terminals to the two
male 1/4−in quick−connect terminals on the control
board marked EAC 1 AMP and NEUTRAL. The termin-
als are rated for 115 VAC, 1.0 amps maximum and are
energized during blower motor operation. (See
Figure 25)
2. Humidifier (HUM 24VAC and HUM)
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a. HUM 24VAC: Connect an accessory 24
VAC, 0.5 amp maximum humidifier (if used) to the
1/4−in male quick−connect HUM 24VAC terminal
and C screw terminal on the control board thermo-
stat strip. The HUM 24VAC terminal is energized
when there is a call for heat (W) and the pressure
switch (PRS) closes. (See Figure 25 and Figure 48).
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b. HUM: Connect an accessory 115VAC (EAC
and HUM are 1 amp maximum combined) humidifier
(if used) to the ¼−inch male quick connect HUM
terminal and NEUTRAL ¼−inch quick connect. The
HUM terminal is energized when the inducer motor
is energized (IDR). (See Figure 25 and Figure 48).
NOTE: A field−supplied, 115−v controlled relay connected to
EAC terminals may be added if humidifier operation is
desired during blower operation.
NOTE: DO NOT connect furnace control HUM 24VAC
terminal to H (humidifier) terminal on humidity sensing
thermostat, or similar device.
thermostat, thermostat,
instructions for proper connection.
See humidity sensing
or controller manufacturer's
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