INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MAE
440 01 4300 02
31
Specifications subject to change without notice.
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 36
.
5. Connect field power and neutral leads to furnace power
leads. as shown in
Figure 34
.
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
Figure 39
) Connect terminal Y/Y2 as shown in
Figure 34
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 38
and
Figure 39
)
See the Service and Technical Support manual for detailed
instructions on control wiring and setup.
Thermostats and Control Settings
For best results, use a communicating wall control to control
this modulating furnace. A single stage or two
−
stage heating
and cooling thermostat can be used with the furnace. The
furnace control board CPU will control the furnace and outdoor
unit staging. A two stage heating and cooling thermostat can
also be used to control the staging. However, full modulating
capability will not be available when the furnace staging is
controlled by the thermostat. Furnace staging will be limited to
Minimum and Maximum inputs or Intermediate and Maximum
inputs depending on the configuration of set-up switches
SW1-2 and SW4-2. Refer to typical thermostat wiring diagrams
and the Sequence of Operation section for additional details.
Consult the thermostat installation instructions for specific
information about configuring the thermostat.
Accessories
(
See
Figure 38
and
Figure 39)
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.
Connect an accessory 24 VAC, 0.5 amp. Maximum (if
used) to the 1/4
−
in male quick
−
connect HUM terminal
and COM
−
24V screw terminal on the control board
thermostat strip.
NOTE
: If the humidifier has its own 24 VAC power supply, an
isolation relay may be required. Connect the 24 VAC coil of the
isolation relay to the HUM and COM/24V screw terminal on the
control board thermostat strip. (See
Figure 39
)
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.
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.
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 supply manufacturer for
specifications and details.
Table 11
Electrical Data
−
MODULATING (F/G)9MAE
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
{
Maximum*
Minimum*
0601714
115-60-1
127
104
9.7
12.7
14
29 (8.8)
15
0602120
115-60-1
127
104
14.8
19.1
12
30 (9.1)
20
0801714
115-60-1
127
104
9.7
12.7
14
29 (8.8)
15
0802120
115-60-1
127
104
14.8
19.1
12
30 (9.1)
20
1002122
115-60-1
127
104
14.8
19.1
12
30 (9.1)
20
1202422
115-60-1
127
104
14.8
19.1
12
30 (9.1)
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.
