268894-UIM-A-0407
10
Unitary Products Group
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.
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
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, Figure 30, in this instruction.
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 (3) wires, a Black Wire, a White Wire
and a Green Wire. Connect the power supply as shown on the unit
wiring label on the inside of the blower compartment door or Fig-
ure 8. The black furnace lead must be connected to the L1 (hot)
wire from the power supply. The white furnace lead must be con-
nected 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” (5.1 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 fur-
nace panel. After making the wiring connections replace the wiring
box cover and screws.
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 nine (9) times. The fur-
nace will not operate until the polarity is corrected. Refer to
"FURNACE DIAGNOSTICS" section of the “User’s Information,
Maintenance, & Service Manual” provided with this furnace for
symptoms of reversed power supply polarity.
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 9. Electronic thermo-
stats may require the common wire to be connected as shown in Figure
9. Apply strain relief to thermostat wires passing through cabinet. If air
conditioning equipment is installed, use thermostat wiring to connect
the Y and C terminals on the furnace control board to the proper wires
on the condensing unit (unit outside).
TABLE 7:
Ratings & Physical / Electrical Data
Input
Output
Nominal
Airflow
Cabinet Width
Total Unit
Amps
AFUE
Air Temp. Rise
MBH
kW
MBH
kW
CFM
m
3
/min
In.
cm
°F
°C
40
11.7
32
9.4
1200
34.0
14-1/2
36.8
9.0
80.0
20-50
11-28
60
17.6
48
14.1
1200
34.0
14-1/2
36.8
9.0
80.0
25-55
13-31
80
23.5
64
18.8
1200
34.0
14-1/2
36.8
9.0
80.0
35-65
19-36
80
23.5
64
18.8
1600
45.3
17-1/2
44.5
12.0
80.0
25-55
13-31
80
23.5
64
18.8
1600
45.3
21
53.3
12.0
80.0
25-55
13-31
100
29.3
80
23.4
1200
34.0
17-1/2
44.5
12.0
80.0
40-70
22 39
100
29.3
80
23.4
1600
45.3
21
53.3
12.0
80.0
25-55
13-31
100
29.3
80
23.4
2000
56.6
21
53.3
14.0
80.0
25-55
13-31
115
33.7
92
26.9
1600
45.3
21
53.3
12.0
80.0
35-65
19-36
115
33.7
92
26.9
2000
56.6
21
53.3
14.0
80.0
30-60
17-33
130
38.1
104
30.5
2000
56.6
24-1/2
62.2
14.0
80.0
40-70
22-39
Input
Max. Outlet
Air Temp
Blower
Blower Size
Max
Over-Current
Protect
Min. wire Size
(awg) @ 75 ft
one way
Operation
Weight
MBH
kW
°F
°C
Hp
Amps
In.
cm
LBS
Kg
40
11.7
150
65.6
1/3
6.2
10 x 8
25.4 x 20.3
20
14
100
45.4
60
17.6
155
68.3
1/3
6.2
10 x 8
25.4 x 20.3
20
14
110
49.9
80
23.5
165
73.9
1/3
6.2
10 x 8
25.4 x 20.3
20
14
120
54.4
80
23.5
160
71.1
3/4
11.0
11 x 10
27.9 x 25.4
20
14
130
59.0
80
23.5
160
71.1
3/4
11.0
10 x 10
25.4 x 25.4
20
14
130
59.0
100
29.3
170
76.7
1/2
7.0
10 x 8
25.4 x 20.3
20
14
125
56.7
100
29.3
155
68.3
3/4
11.0
11 X 10
27.9 x 25.4
20
14
140
63.5
100
29.3
155
68.3
1
12.2
11 x 11
27.9 x 27.9
20
12
140
63.5
115
33.7
165
73.9
3/4
11.0
11 x 10
27.9 x 25.4
20
14
150
68.0
115
33.7
160
71.1
1
12.2
11 x 11
27.9 x 27.9
20
12
150
68.0
130
38.1
170
76.7
1
12.2
11 x 11
27.9 x 27.9
20
12
160
72.6
FIGURE 8:
Electrical Wiring
NEUTRALS
EAC
COOL
HEA
T
HUM
PA
RK
PA
RK
L1
XFMR
Y W R G C
L1
HOT
N
GRN
GRN
WHT
BLK
JUNCTION
BOX
BLK/BLK
WHT/WHT
GRN/GRN
WIRING INSIDE
JUNCTION BOX
VENT PIPE
CLASS 2 SYSTEM
CONTROL WIRING
TO THERMOSTAT
FLUE CHASE
DOOR
SWITCH
BURNER COMPARTMENT
BLOWER COMPARTMENT
IGNITION MODULE
TRANSFORMER
