International comfort products G9MVE A3 Series Installation Instructions Manual page 33

INSTALLATION INSTRUCTIONS
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 38.
5. Connect field power and neutral leads to furnace power
leads. as shown in Figure 36.
6. Attach furnace J−Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
WARNING
!
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 41) Connect terminal Y/Y2 as shown in Figure 36 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 41)
See the Service and Technical Support manual for detailed
instructions on control wiring and setup.
Thermostats and Control Settings
Communicating, single−stage and two−stage thermostats may
all be used with this furnaces. Refer to typical thermostat wiring
diagrams and the Sequence of Operation section
Service and Technical Support manual for details on
Table 11 Electrical Data
VOLTS−
HERTZ−
PHASE
UNIT SIZE
0401410 115−60−1
0401712 115−60−1
0601412 115−60−1
0601714 115−60−1
0801716 115−60−1
0802120 115−60−1
1002120 115−60−1
1202422 115−60−1
* Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
{ Time−delay type is recommended.
} Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.
440 01 4401 02
of the
TWO−STAGE, VARIABLE SPEED FURNACES
OPERATING
VOLTAGE
MAXIMUM
RANGE*
UNIT
AMPS
Max* Min*
127 104 7.5
127 104 7.5
127 104 7.6
127 104 10.9
127 104 10.9
127 104 14.7
127 104 14.8
127 104 14.8
Specifications subject to change without notice.
configuring the furnace control board. Consult the thermostat
installation instructions for
configuring the thermostat.
Accessories
(See Figure 40 and Figure 41)
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 115VAC, 1.0 amps maximum and are
energized during blower motor operation.
2. Humidifier (HUM)
The HUM terminal is a 24 VAC output, energized
when the blower is operating during a call for heat.
(See Figure 41)
3. Communication Connector
This connection is used when the furnace is
controlled by an optional communicating wall control
instead of a standard thermostat. The communication
plug is supplied with the communicating wall control.
Refer to the instructions
communicating wall control for complete details. (See
Figure 41)
4. Outside Air Thermistor (OAT)
The OAT connection is used in conjunction with
communicating wall control. It is not required when the
furnace is controlled by a standard type thermostat.
Refer to the instructions
communicating wall control for complete details. (See
Figure 41)
Alternate Power Supplies
This furnace is designed to operate on a utility generated
power which has a smooth sinusoidal waveform. If the furnace
is to be operated on a generator or other alternate power
supply, the alternate power supply must produce a smooth
sinusoidal waveform for compatibility with furnace electronics.
The alternate power supply must generate the same voltage,
phase, and frequency (Hz) as shown in Table 11 or on the
furnace rating plate.
Power from an alternate power supply that non-sinusoidal may
damage the furnace or cause erratic furnace operation.
Contact the alternate power
specifications and details.
MINIMUM
WIRE
UNIT
SIZE
AMPACITY#
AWG
10.3 14
10.2 14
10.3 14
14.5 14
14.5 14
19.3 12
19.4 12
19.4 12
Gas Furnace: (F/G)9MVE
specific information about
supplied with
supplied with
supply manufacturer
MAXIMUM MAXIMUM
WIRE FUSE OR CKT
LENGTH BKR
FT (M)} AMPS{
36 (11.0) 15
36 (11.0) 15
36 (11.0) 15
25 (7.6) 15
25 (7.6) 15
29 (8.8) 20
29 (8.8) 20
29 (8.8) 20
33
the
the
for