International comfort products C Series Installation Instructions Manual page 35

INSTALLATION INSTRUCTIONS
Field- -Supplied External Electrical
Figure 42
Box on Furnace Casing
GROUND
NEUTRAL
LINE
VOLTAGE
Power Cord Installation in Furnace J- - Box
NOTE: Power cords must be able to handle the electrical
requirements listed in Table 11. Refer to power cord
manufacturer's listings.
1. Install J--Box mounting bracket to inside of furnace
casing. (See Figure 41)
2. Route listed power cord through 7/8--in. (22 mm)
diameter hole in casing and J--Box bracket.
3. Secure power cord to J--Box bracket with a strain relief
bushing or a connector approved for the type of cord
used.
4. Pull furnace power wires through 1/2--in. (12 mm)
diameter hole in J--Box. If necessary, loosen power wires
from strain—relief wire--tie on furnace wiring harness.
5. Connect field ground wire and factory ground wire to
green ground screw on J--Box mounting bracket as
shown in Figure 41.
6. Connect power cord power and neutral leads to furnace
power leads as shown in Figure 39.
7. Attach furnace J--Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
BX Cable Installation in Furnace J- -Box
1. Install J--Box mounting bracket to inside of furnace
casing.
2. Route BX connector through 7/8--in. (22 mm) diameter
hole in casing and J--Box bracket.
3. Secure BX cable to J--Box bracket with connectors
approved for the type of cable used.
4. Connect field ground wire and factory ground wire to
green ground screw on J--Box mounting bracket as
shown in Figure 41.
5. Connect field power and neutral leads to furnace power
leads. as shown in Figure 39.
6. Attach furnace J--Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
440 01 4104 07
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON
MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, personal injury, death, or property damage.
Do no drill into blower shelf of furnace to route control wiring.
Route any control or accessory wiring to the blower
compartment through external knockouts on the casing.
24- -V Wiring
Make field 24--v connections at the 24--v terminal strip. (See
Figure 44) Connect terminal Y as shown in Figure 39 for
proper cooling operation. Use only AWG No. 18, color--coded,
copper thermostat wire.
NOTE: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. (30.5 M). For wire lengths over 100 ft.,
use AWG No. 16 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. (See Figure 44)
See the Service and Technical Support manual for detailed
A10141
instructions on control wiring and setup.
Thermostats and Control Settings for
N9MSB Single- -Stage Furnaces
A single stage heating and single--stage cooling thermostat
may be used with the furnace. Refer to typical thermostat wiring
diagrams and the Sequence of Operation section of the
Service and Technical Support manual for details on
configuring the furnace control board. Consult the thermostat
installation
configuring the thermostat.
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 and NEUTRAL. The terminals are
rated for 115 VAC, 1.0 amps maximum and are
energized during blower motor operation.
Figure 44)
2. Humidifier (HUM 24VAC and HUM)
S
S
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. See humidity sensing thermostat, thermostat, or
controller manufacturer's instructions for proper connection.
Specifications subject to change without notice.
Gas Furnace: N9MSB
WARNING
!
instructions for specific
(See Figure 43 and/or Figure 44)
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 thermostat strip. The
HUM 24VAC terminal is energized when there is a call
for heat (W) and the pressure switch (LPS) closes.
(See Figure 44)
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 44)
information about
(See
35