1034868-UIM-A-0513
12
Johnson Controls Unitary Products
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 63°F (35°C) rise
wire when installed in accordance with instructions. Refer to Table 7 in
these instructions for specific furnace electrical data.
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 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
located 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 wire 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 Figure 17.
3.
The furnace's control system requires correct polarity of the power
supply and a proper ground connection. Refer to Figure 17.
Use copper conductors only.
Table 7:
Ratings & Physical / Electrical Data
Input
High/Low
Output
High/Low
Nominal
Airflow
Cabinet Width
Total Unit
Amps
AFUE
High Fire
Air Temp. Rise
Low Fire
Air Temp. Rise
MBH
kW
MBH
kW
CFM
m
3
/min
in.
cm
%
°F °C °F °C
40/26
12/8
38/25
11/7
1000
28.3
14-1/2
36.8
9
96
30 - 60
17-33
20-50
11-28
60/39
18/11
58/37
17/11
1200
34
17-1/2
44.4
9
96
35 - 65
19-36
35-65
19-36
80/52
23/15
77/50
22/14
1200
34
17-1/2
44.4
9
96
40 - 70
22-39
35-65
19-36
80/52
23/15
77/50
22/14
1600
45.3
21
53.3
12
96
35 - 65
19-36
35-65
19-36
100/65
29/19
96/62
28/18
1600
45.3
21
53.3
12
96
35 - 65
19-36
30-60
17-33
100/65
29/19
96/62
28/18
2000
56.6
21
53.3
14
96
35 - 65
19-36
35-65
19-36
120/78
35/23
115/75
33/22
2000
56.6
24-1/2
62.2
14
96
35 - 65
19-36
35-65
19-36
Input
High/Low
Max. Outlet
Air Temp.
Blower
Blower Size
Max.
Over-current
Protect
Min. Wire Size
(awg) @ 75 ft.
One Way
Operating
Weight
MBH
kW
°F
°C
HP
Amps in.
cm
Lbs.
Kg.
40/26
12/8
180
82.2
1/2
7
11 x 8
27.9 x 20.3
15
14
113
51.2
60/39
18/11
170
76.7
1/2
7
11 x 8
27.9 x 20.3
15
14
122
55.3
80/52
23/15
175
79.4
1/2
7
11 x 8
27.9 x 20.3
15
14
126
57.1
80/52
23/15
175
79.4
3/4
10.2
11 x 10
27.9 x 25.4
15
14
136
61.7
100/65
23/15
175
79.4
3/4
10.2
11 x 10
27.9 x 25.4
15
14
142
64.4
100/65
29/19
175
79.4
1
12.7
11 x 11
27.9 x 27.9
20
12
145
65.7
120/78
35/23
170
76.7
1
12.7
11 x 11
27.9 x 27.9
20
12
156
70.7
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.
