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106633-UIM-A-0205
SECTION V: ELECTRICAL POWER
TABLE 6: Electrical and Performance Data
Input High/Low
Output High/Low
MBH
kW
MBH
40/26
12/8
38/24
60/39
18/11
56/36
80/52
23/15
75/49
80/52
23/15
75/49
100/65
29/19
93/60
100/65
29/19
93/60
120/78
35/23
112/73
Max. Outlet
Nominal Airflow
Air Temp.
°F
°C
CFM
165
73.9
1200
170
76.7
1200
175
79.4
1200
175
79.4
1600
175
79.4
1600
175
79.4
2000
170
76.7
2000
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.
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.
Use copper conductors only.
SUPPLY VOLTAGE CONNECTIONS
IMPORTANT: The power connection leads and wiring box may be relo-
cated 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 fas-
ten using holes provided.
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 shown in Figure 26.
2.
Remove the screws retaining the junction 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 three wires, a Black Wire, a White Wire and a
Green Wire. Connect the power supply as shown on the unit-wir-
ing label on the inside of the blower compartment door or Figure 6.
The black furnace lead must be connected to the L1 (hot) wire
from the power supply. The white furnace lead must be connected
to neutral. Connect the green furnace lead (equipment ground) to
the power supply ground. An alternate wiring method is to use a
field provided 2" (5.08 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.
8
Blower Size
kW
In.
cm
11/7
11 x 8
27.9 x 20.3
16/11
11 x 8
27.9 x 20.3
22/14
11 x 8
27.9 x 20.3
22/14
11 x 10
27.9 x 25.4
27/18
11 x 10
27.9 x 25.4
27/18
11 x 11
27.9 x 27.9
33/21
11 x 11
27.9 x 27.9
Cabinet Width
3
In.
cm
m
/min
34.0
14-1/2
36.8
34.0
17-1/2
44.4
34.0
17-1/2
44.4
45.3
21
53.3
45.3
21
53.3
56.6
21
53.3
56.6
24-1/2
62.2
Blower
Over-current
HP
Amps
1/2
7.7
1/2
7.7
1/2
7.7
3/4
10.2
3/4
10.2
1
12.8
1
12.8
Min. Wire Size
Total Unit
AFUE
(awg) @ 75 ft.
Amps
%
9
94.0
9
93.2
9
92.5
12
92.8
12
92.5
14
92.8
14
93.2
3.
The furnace's control system requires correct polarity of the power
supply and a proper ground connection. If the power supply polar-
ity is reversed, the control board will flash 9 times. The furnace will
not operate until the polarity is corrected. Refer to "Furnace Diag-
nostics" section of the "User's Information, Maintenance, & Ser-
vice Manual provided with this furnace.
L1
HOT
N
GND
WHT
GRN
BLK/BLK
BLK
WHT/WHT
GRN/GRN
CLASS 2 SYSTEM
CONTROL WIRING
TO THERMOSTAT
BLOWER
COMPARTMENT
DOOR SWITCH
TRANSFORMER
FIGURE 5: Electrical Wiring
Max.
Air Temp. Rise
°F
Protect
20
35 - 65
19 - 36
20
40 - 70
22 - 39
20
45 - 75
25 - 42
20
45 - 75
25 - 42
20
45 - 75
25 - 42
20
45 - 75
25 - 42
20
40 - 70
22 - 39
Approximate
One Way
Operating Weight
14
121
14
135
14
142
14
157
14
162
12
164
12
180
IGNITION
MODULE
Unitary Products Group
°C
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