364861-UIM-D-1209
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.
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
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 wiring box cover screws. Route all power wiring
through a conduit connector or other proper bushing that has been
installed into the unit opening and the junction box. In the junction
box there is a black wire, a white wire and a green ground screw.
Connect the power supply as shown on the unit’s wiring label on
the inside of the blower compartment door or the wiring schematic
in this section. Connect the black wire to L1 (hot) from the power
supply. Connect the white wired to neutral. Connect the ground
wire (installer-supplied) to the green (equipment ground) screw.
An alternate wiring method is to use a field-provided 2” (5.1 cm) x
4” (10.2 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 Fig-
ure 17.
3.
The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 17.
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 17. 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).
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.
Table 6:
Ratings & Physical / Electrical Data
Input
Output
Nominal
Airflow
AFUE
%
Air Temp. Rise
Max. Outlet
Air Temp
Blower
Blower
Size
Max
Over-Current
Protect
Total Unit
Amps
Min. wire Size
(awg) @ 75 ft
one way
MBH kW
MBH
kW CFM m
3
/min
°F
°C
°F
°C
HP
Amps
40
11.7
38
11.1 800
22.7
95.5
30-60
17-33
160
71.1
1/3
4.8
11x8
15
8.0
14
60
17.6
57
16.7 1000
28.3
95.5
30-60
19-36
160
71.1
1/2
7.07
11x8
15
10.0
14
60
17.6
57
16.7 1200
34.0
95.5
30-60
19-36
160
71.1
1/2
7.07
11x8
15
10.0
14
80
23.4
76
22.3 1200
34.0
95.5
35-65
19-36
165
73.9
1/2
7.07
11x8
15
10.0
14
80
23.4
76
22.3 1600
45.3
95.5
35-65
19-36
165
73.9
3/4
8.8
11x10
15
11.5
14
80
23.4
76
22.3 2200
62.3
95.5
35-65
19-36
165
73.9
1
14.5
11x11
20
17.0
12
100 29.3
95
27.8 1600
45.3
95.5
35-65
19-36
165
73.9
3/4
8.8
11x10
15
11.5
14
100 29.3
95
27.8 2000
56.6
95.5
35-65
19-36
165
73.9
1
14.5
11x11
20
17.0
12
120 35.1
114
33.4 1600
45.3
95.5
40-70
22-39
170
76.7
3/4
8.8
11x10
15
11.5
14
120 35.1
114
33.4 2000
56.6
95.5
35-65
19-36
165
73.9
1
14.5
11x11
20
17.0
12
130 38.1 123.5 36.2 2000
56.6
95.5
45-75
28-44
175
79.4
1
14.5
11x11
20
17.0
12
FIGURE 17:
Electrical Wiring
Electrical Entry
Junction
Box
L1-Hot
Neutral
Connect ground
lead to screw
BLK
WHT
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.
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.
