INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVE
440 01 4400 03
33
Specifications subject to change without notice.
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
5. Connect field power and neutral leads to furnace power
.
6. Attach furnace J
−
Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
24
−
V Wiring
Make field 24
−
v connections at the 24
−
v terminal strip. (See
) Connect terminal Y/Y2 as shown in
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
)
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 of the
Service and Technical Support manual for details on
configuring the furnace control board. Consult the thermostat
installation instructions for specific information about
configuring the thermostat.
Accessories
(
See
)
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.
)
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 supplied with the
communicating wall control for complete details. (See
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 supplied with the
communicating wall control for complete details. (See
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
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 supply manufacturer for
specifications and details.
Table 11 Electrical Data
TWO
−
STAGE, VARIABLE SPEED FURNACES
UNIT SIZE
VOLTS
−
HERTZ
−
PHASE
OPERATING
VOLTAGE
RANGE*
MAXIMUM
UNIT
AMPS
UNIT
AMPACITY#
MINIMUM
WIRE
SIZE
AWG
MAXIMUM
WIRE
LENGTH
FT (M)
}
MAXIMUM
FUSE OR CKT
BKR
AMPS
{
Max*
Min*
0401410
115-60-1
127
104
7.5
10.3
14
36
(11.0)
15
0401712
115-60-1
127
104
7.5
10.2
14
36
(11.0)
15
0601412
115-60-1
127
104
7.6
10.3
14
36
(11.0)
15
0601714
115-60-1
127
104
9.2
12.4
14
29
(8.8)
15
0801716
115-60-1
127
104
9.2
12.4
14
29
(8.8)
15
0802120
115-60-1
127
104
11.7
15.5
12
37
(11.3)
20
1002120
115-60-1
127
104
11.8
15.6
12
36
(11.0)
20
1202422
115-60-1
127
104
11.8
15.6
12
36
(11.0)
20
* 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.
