Filter
Top Products
368262-UIM-B-1008
12 Johnson Controls Unitary Products
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.
SUPPLY VOLTAGE CONNECTIONS
1. Provide a power supply separate from all other circuits. Install
overcurrent protection and disconnect switch per local/national
electrical codes. The switch should be close to the unit for conve-
nience in servicing. With the disconnect or fused switch in the OFF
position, check all wiring against the unit wiring label. Refer to the
wiring diagram 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 junc-
tion box there will be 3 wires, a Black Wire, a White Wire. Connect
the power supply as shown on the unit-wiring label on the inside of
the blower compartment door or the wiring schematic in this sec-
tion. The black furnace lead must be connected to the L1 (hot)
wire from the power supply. The white furnace screw must be con-
nected 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” (10.2 cm) box and cover on the out-
side 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 18.
3. The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 18.
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 terminal
board on the ignition module, as shown in Figures 19-24, Thermostat
Charts. Electronic thermostats may require the common wire to be con-
nected as shown in Figure 16. Apply strain relief to thermostat wires
passing through cabinet.
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 an
air conditioning unit contactor.
AIR CONDITIONER CONNECTIONS
This furnace may be used with single-stage or two-stage air condition-
ing units.
For Single-Stage A/C - Connect the low voltage wiring as shown in
Figure 19, Thermostat Chart.
For Two-Stage A/C - Use a two-stage thermostat, connect the low volt-
age wiring as shown in Figure 20, Thermostat Chart.
For Two-Stage A/C using a Single-Stage Thermostat - connect the
low voltage wiring as shown in Figure 20, Thermostat Chart.
This furnace control board can control a two-stage A/C using only a sin-
gle-stage thermostat. In this case, the furnace control switches between
high cool and low cool based on the calculated cooling load.
Table 6: Ratings & Physical / Electrical Data
Input
Max/Min
Output
Max/Min
Nominal
Airflow
Air Temp. Rise
Max Input
Air Temp. Rise
Min Input
MBH kW MBH kW CFM
m
3
/min
°F °C °F °C
60/30 17.6/8.8 47/24 13.8/7.0 1200 34.0 30-60 17-33 20-50 11-28
80/40 23.5/11.8 62/32 18.2/9.4 1200 34.0 40-70 22-39 20-50 11-28
80/40 23.5/11.8 62/32 18.2/9.4 1600 45.3 35-65 19-36 20-50 11-28
100/50 29.3/14.7 78/40 22.8/11.7 1600 45.3 35-65 19-36 20-50 11-28
100/50 29.3/14.7 78/40 22.8/11.7 2000 56.6 35-65 19-36 20-50 11-28
120/60 33.7/16.9 95/48 27.8/14.1 2000 56.6 45-75 25-42 25-55 13-31
Max. Outlet
Air Temp
Blower
Blower
Wheel
size
AFUE
%
Max
Over-Current
Protect
Total Unit
Amps
Min. wire Size
(awg) @ 75 ft
one way
°F °C HP Amps
160 71.1 1/2 4.8 11 x 8 80.0 15 7.0 14
170 76.7 1/2 4.8 11 x 8 80.0 15 7.5 14
165 73.9 3/4 7.5 11 x 10 80.0 15 10.0 14
165 73.9 3/4 7.5 11 x 10 80.0 15 10.0 14
165 73.9 1 14.5 11 x 11 80.0 20 12.0 12
175 79.4 1 14.5 11 x 11 80.0 20 12.0 12
FIGURE 18: Electrical Wiring
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 furnace and fasten
using holes provided.
Electrical Entry
Junction
Box
L1-Hot
Neutral
Connect ground
lead to screw
BLK
WHT
Set the heat anticipator in the room thermostat to 0.1 amps. Setting
it lower will cause short cycles. Setting it higher will cause the room
temperature to exceed the set points.
Some electronic thermostats do not have adjustable heat anticipa-
tors. They should be set to six cycles per hour. Follow the thermo-
stat manufacturer's instructions.