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Furnace Rating
Plate Input (Btu/h)
72000
96000
120000
144000
Table 8. Natural and LP Gas Orifice Sizes for Elevations
between zero and 4999 ft. Above Sea Level
Line Voltage Wiring
The line voltage (115 volt) to the furnace must be supplied
from a dedicated branch circuit containing the correct fuse or
circuit breaker for the furnace. (See Table 10.) An electrical
disconnect must be installed to be readily accessible from
and located within sight of the furnace. (See the Wiring
Diagram label in the furnace and Figure 22.)
CAUTION:
!
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Verify proper operation after servicing.
Furnace
Furnace Cabinet
Model Number
Input
*RA/*RK
(Btu/hr)
072(†)-16
72,000
096(†)-12
96,000
096(†)-16
96,000
096(†)-20
96,000
120(†)-16
120,000
120(†)-20
120,000
144(†)-20
144,000
Note: (†) can be C or N.
* Time-delay fuses or HACR-type circuit breakers are required.
Thermostat Wire Gauge
24
22
20
18
Orifice Drill Size
Nat
LP
43
54
43
54
43
54
43
54
Nominal
Maximum
Width
Electrical
Operating
(in.)
Supply
Voltage
19.75
115-60-1
19.75
115-60-1
19.75
115-60-1
22.50
115-60-1
19.75
115-60-1
22.50
115-60-1
22.50
115-60-1
Table 10. Electrical Data
Furnace Rating
Plate Input (Btu/h)
72000
96000
120000
144000
Table 9. Natural and LP gas Orifice Sizes for Elevations
between 5000 and 10,000 ft. Above Sea Level
The furnace cabinet must have an uninterrupted, unbroken
ground to minimize injury should an electrical fault condition
occur. The controls used in this furnace require an
earth ground to operate properly. Acceptable methods
for grounding are electrical wire or conduit approved for
electrical ground service. Do not use gas piping as an
electrical ground.
IMPORTANT NOTE:
Proper line voltage polarity must be maintained in
order for the control system to operate correctly. Verify
that the incoming neutral line is connected to the white
wire and the incoming "hot" line is connected to the
black wire. These furnaces will not operate unless the
polarity and ground are properly connected. See Figure
22.
Minimum Maximum Minimum
Operating Furnace
Voltage
Amperes
127
103
127
103
127
103
127
103
127
103
127
103
127
103
Recommended Thermostat Wire Length
2-wire
(heating)
55 ft.
90 ft.
140 ft.
225 ft.
Orifice Drill Size
Nat
43
43
43
43
Maximum
Wire
Fuse or Circuit
Gauge
Breaker Amps*
9.0
14
7.1
14
9.0
14
12.2
12
9.0
14
12.2
12
12.2
12
4 or 5-wire
(cooling)
25 ft.
45 ft.
70 ft.
110 ft.
LP
55
55
55
55
15
15
15
20
15
20
20
23
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