5594752-UIM-C-1119
Johnson Controls Ducted Systems 11
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.
The residential supply must have a bonded neutral.
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
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.
3. The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 11.
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.
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.
CAUTION
Use copper conductors only.
!
Table 5: Ratings & Physical / Electrical Data
Input Output
Nominal
Airflow
AFUE
Air Temp.
Rise
Max.
Outlet
Air Temp
Blower
Blower
Size
Recommended
Fuse or Circuit
Breaker Amps
Total
Unit
Amps
Gas Pipe
Connection,
NPT
MBH
kW MBH kW CFM
m
3
/min
ºF ºC ºF ºC HP
Amps
40 11.7 32 9.4 1200 34.0 80.0 20-50 11-28 190 88 1/2 6.4 11 x 8 15 8.2 1/2"
60 17.6 48 14.1 1200 34.0 80.0 30-60 17-33 190 88 1/2 6.4 11 x 8 15 8.2 1/2"
80 23.5 64 18.8 1200 34.0 80.0 35-65 19-36 190 88 1/2 6.4 11 x 8 15 8.7 1/2"
80 23.5 64 18.8 1600 45.3 80.0 30-60 17-33 190 88 1/2 8.8 11 x 10 15 8.7 1/2"
80 23.5 64 18.8 2000 56.6 80.0 25-55 14-31 190 88 1 11.5 11 x 11 20 13.8 1/2"
100 29.3 80 23.4 1200 34.0 80.0 40-70 22-39 190 88 1/2 6.4 11 x 8 15 8.7 1/2"
100 29.3 80 23.4 1600 45.3 80.0 40-70 22-39 190 88 3/4 8.8 11 x 10 15 11.1 1/2"
100 29.3 80 23.4 2000 56.6 80.0 25-55 14-31 190 88 1 11.5 11 x 11 20 13.8 1/2"
120 33.7 96 26.9 1600 45.3 80.0 40-70 22-39 190 88 3/4 8.8 11 x 10 15 11.1 1/2"
120 33.7 96 26.9 2000 56.6 80.0 35-65 19-36 190 88 1 11.5 11 x 11 20 13.7 1/2"
130 38.1 104 30.5 2000 56.6 80.0 35-65 19-36 190 88 1 11.5 11 x 11 20 13.7 1/2"
FIGURE 11: Electrical Wiring
Electrical Entry
Junction
Box
L1-Hot
Neutral
Connect ground
lead to screw
BLK
WHT
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.
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.
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