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SECTION V: ELECTRICAL POWER
ELECTRICAL POWER CONNECTIONS
Field wiring to the unit must be grounded. Electric wires that are field
installed shall conform to the temperature limitation for 63ºF (35ºC) rise
wire when installed in accordance with instructions. Refer to Table 5 in
these instructions for specific furnace electrical data.
Table 5: Ratings & Physical / Electrical Data
Nominal
Input
Output
kW
MBH
kW
CFM
MBH
40
11.7
32
9.4
1200
60
17.6
48
14.1
1200
80
23.5
64
18.8
1200
80
23.5
64
18.8
1600
80
23.5
64
18.8
2000
100
29.3
80
23.4
1200
100
29.3
80
23.4
1600
100
29.3
80
23.4
2000
120
33.7
96
26.9
1600
120
33.7
96
26.9
2000
130
38.1
104
30.5
2000
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.
The furnace shall be installed so that the electrical components are protected from water.
SUPPLY VOLTAGE CONNECTIONS
Junction
Box
Connect ground
lead to screw
Electrical Entry
BLK
L1-Hot
WHT
Neutral
FIGURE 11: Electrical Wiring
1. Provide a power supply separate from all other circuits. Install over-
current protection and disconnect switch per local/national electrical
codes. The switch should be close to the unit for convenience in
servicing. With the disconnect or fused switch in the OFF position,
check all wiring against the unit wiring label. Refer to the wiring dia-
gram in this instruction.
2. Remove the screws retaining the wiring box cover. Route the power
wiring through the opening in the unit into the junction box with a
conduit connector or other proper connection. In the junction box,
there will be a black wire and a white wire. Connect the power sup-
ply as shown on the unit-wiring label on the inside of the blower
compartment door or the wiring schematic in this section. The black
furnace lead must be connected to the L1 (hot) wire from the power
supply. The white furnace screw must be connected to neutral.
Connect the power supply ground to the green screw (equipment
ground) An alternate wiring method is to use a field provided 2" (5.1
cm) x 4" (10.1 cm) box and cover on the outside of the furnace.
Route the furnace leads into the box using a protective bushing
where the wires pass through the furnace panel. After making the
wiring connections replace the wiring box cover and screws. Refer
to Figure 11.
Johnson Controls Ducted Systems
Air Temp.
Airflow
Rise
AFUE
3
ºF
m
/min
34.0
80.0
20-50
11-28
34.0
80.0
30-60
17-33
34.0
80.0
35-65
19-36
45.3
80.0
30-60
17-33
56.6
80.0
25-55
14-31
34.0
80.0
40-70
22-39
45.3
80.0
40-70
22-39
56.6
80.0
25-55
14-31
45.3
80.0
40-70
22-39
56.6
80.0
35-65
19-36
56.6
80.0
35-65
19-36
The residential supply must have a bonded neutral.
Use copper conductors only.
Max.
Outlet
Blower
Air Temp
ºC
ºF
ºC
HP
Amps
190
88
1/2
6.4
190
88
1/2
6.4
190
88
1/2
6.4
190
88
1/2
8.8
190
88
1
11.5
190
88
1/2
6.4
190
88
3/4
8.8
190
88
1
11.5
190
88
3/4
8.8
190
88
1
11.5
190
88
1
11.5
3. The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 11.
IMPORTANT: The power connection leads and wiring box may be
relocated to the left side of the furnace. Remove the screws and cut
wire tie holding excess wiring. Reposition on the left side of the fur-
nace and fasten using holes provided.
LOW VOLTAGE CONTROL WIRING CONNECTIONS
Install the field-supplied thermostat by following the instructions that
come with the thermostat. With the thermostat set in the OFF position
and the main electrical source disconnected, connect the thermostat
wiring from the wiring connections on the thermostat to the low voltage
terminal block on the integrated furnace control board, as shown in Fig-
ures 12 & 13. Electronic thermostats require the common wire to be
connected. Apply strain relief to thermostat wires passing through cabi-
net. If air conditioning equipment is installed, use thermostat wiring to
connect the Y and C terminals on the furnace control board to the
proper wires on the outdoor unit.
IMPORTANT: Set the heat anticipator in the room thermostat to 0.4
amps. Setting it lower will cause short cycles. Setting it higher will
cause the room temperature to exceed the set points.
IMPORTANT: Some electronic thermostats do not have adjustable
heat anticipators. They should be set to six cycles per hour. Follow
the thermostat manufacturer's instructions.
The 24-volt, 40 VA transformer is sized for the furnace components
only, and should not be connected to power auxiliary devices such as
humidifiers, air cleaners, etc. The transformer may provide power for a
split system air conditioner or heat pump.
5594752-UIM-C-1119
CAUTION
!
Recommended
Total
Blower
Fuse or Circuit
Unit
Size
Breaker Amps
Amps
11 x 8
15
8.2
11 x 8
15
8.2
11 x 8
15
8.7
11 x 10
15
8.7
11 x 11
20
13.8
11 x 8
15
8.7
11 x 10
15
11.1
11 x 11
20
13.8
11 x 10
15
11.1
11 x 11
20
13.7
11 x 11
20
13.7
Gas Pipe
Connection,
NPT
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
1/2"
11
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