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1034868-UIM-A-0513
SECTION V: ELECTRICAL POWER
ELECTRICAL POWER CONNECTIONS
Use copper conductors only.
Table 7: Ratings & Physical / Electrical Data
Input
Output
High/Low
High/Low
MBH
kW
MBH
kW
40/26
12/8
38/25
11/7
60/39
18/11
58/37
17/11
80/52
23/15
77/50
22/14
80/52
23/15
77/50
22/14
100/65
29/19
96/62
28/18
100/65
29/19
96/62
28/18
120/78
35/23
115/75
33/22
Input
Max. Outlet
High/Low
Air Temp.
MBH
kW
°F
°C
40/26
12/8
180
82.2
60/39
18/11
170
76.7
80/52
23/15
175
79.4
80/52
23/15
175
79.4
100/65
23/15
175
79.4
100/65
29/19
175
79.4
120/78
35/23
170
76.7
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 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
12
Nominal
Cabinet Width
Airflow
3
CFM
in.
m
/min
1000
28.3
14-1/2
1200
34
17-1/2
1200
34
17-1/2
1600
45.3
21
1600
45.3
21
2000
56.6
21
2000
56.6
24-1/2
Blower
Blower Size
HP
Amps
in.
1/2
7
11 x 8
27.9 x 20.3
1/2
7
11 x 8
27.9 x 20.3
1/2
7
11 x 8
27.9 x 20.3
3/4
10.2
11 x 10
27.9 x 25.4
3/4
10.2
11 x 10
27.9 x 25.4
1
12.7
11 x 11
27.9 x 27.9
1
12.7
11 x 11
27.9 x 27.9
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.
AFUE
Total Unit
Amps
cm
36.8
9
44.4
9
44.4
9
53.3
12
53.3
12
53.3
14
62.2
14
Max.
Min. Wire Size
Over-current
(awg) @ 75 ft.
cm
Protect
One Way
15
15
15
15
15
20
20
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.
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.
High Fire
Air Temp. Rise
Air Temp. Rise
%
°F
°C
96
30 - 60
17-33
20-50
96
35 - 65
19-36
35-65
96
40 - 70
22-39
35-65
96
35 - 65
19-36
35-65
96
35 - 65
19-36
30-60
96
35 - 65
19-36
35-65
96
35 - 65
19-36
35-65
Operating
Weight
Lbs.
Kg.
14
113
51.2
14
122
55.3
14
126
57.1
14
136
61.7
14
142
64.4
12
145
65.7
12
156
70.7
Johnson Controls Unitary Products
Low Fire
°F
°C
11-28
19-36
19-36
19-36
17-33
19-36
19-36
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