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Table 6: Ratings & Physical / Electrical Data
Input
Output
MBH
kW
MBH
kW
40
11.7
38
11.1
60
17.6
57
16.7
60
17.6
57
16.7
80
23.4
76
22.3
80
23.4
76
22.3
80
23.4
76
22.3
100
29.3
95
27.8
100
29.3
95
27.8
120
35.1
114
33.4
120
35.1
114
33.4
130
38.1
123.5
36.2
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 17: Electrical Wiring
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 17, "Electrical Wiring".
3.
The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 17, "Elec-
trical Wiring"
Johnson Controls Unitary Products
Nominal
Total Unit
Airflow
Amps
3
CFM
m
/min
800
22.7
8.0
1000
28.3
10.0
1200
34.0
10.0
1200
34.0
10.0
1600
45.3
11.5
2200
62.3
17.0
1600
45.3
11.5
2000
56.6
17.0
1600
45.3
11.5
2000
56.6
17.0
2000
56.6
17.0
Air Temp. Rise
AFUE
Over-Current
%
°F
°C
95.5
30-60
17-33
95.5
30-60
19-36
95.5
30-60
19-36
95.5
35-65
19-36
95.5
35-65
19-36
95.5
35-65
19-36
95.5
35-65
19-36
95.5
35-65
19-36
95.5
40-70
22-39
95.5
35-65
19-36
95.5
45-75
28-44
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.
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 Figure 18, "Thermostat Chart
- Single Stage AC with Single Stage PSC Furnaces". Electronic thermo-
stats may require the common wire to be connected. Apply strain relief
to thermostat wires passing through cabinet. If air conditioning equip-
ment is installed, use thermostat wiring to connect the Y and C termi-
nals on the furnace control board to the proper wires on the condensing
unit (unit outside).
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.
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.
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.
364861-UIM-B-0708
Max
Min. wire Size
(awg) @ 75 ft
Protect
one way
15
14
15
14
15
14
15
14
15
14
20
12
15
14
20
12
15
14
20
12
20
12
Max. Outlet
Air Temp
°F
°C
155
68.3
155
68.3
160
71.1
165
73.9
155
68.3
155
68.3
165
73.9
155
68.3
170
76.7
160
71.1
165
73.9
11
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