International comfort products R8MXL 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 6100 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 and EAC−2. The terminals are
rated for 115 VAC, 1.0 amps maximum and are ener-
gized during blower motor operation. (See Figure 25)
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp. maximum hu-
midifier (if used) to the 1/4−in male quick−connect HUM
terminal and COM−24V screw terminal on the control
board thermostat strip. The HUM terminal is energized
when the pressure switch closes during a call for heat.
(See Figure 25)
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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