19
to the black wire. The furnace will not operate unless
the polarity and ground are properly connected as
shown in Figure 14.
Grounding
WARNING:
To minimize personal injury, the furnace cabinet
must have an uninterrupted or unbroken
electrical ground. The controls used in this
furnace require an earth ground to operate
properly. Acceptable methods include electrical
wire or conduit approved for ground service.
Do not use gas piping as an electrical ground!
Line Voltage Wiring
It is recommended that the line voltage (115 VAC) to
the furnace be supplied from a dedicated branch circuit
containing the correct fuse or circuit breaker for the
furnace (Table 2).
IMPORTANT NOTES:
An electrical disconnect must be installed readily
accessible from and located within sight of the furnace.
See Figure 14 or the wiring diagram label inside of
the control door. Any other wiring methods must be
acceptable to authority having jurisdiction.
Proper line voltage polarity must be maintained in
order for the control system to operate correctly.
Verify the incoming neutral line is connected to the
white wire and the incoming “hot” line is connected
Furnace
Model
*SA/*SK
Furnace
Input
(Btuh)
Cabinet
Width
(in.)
Nominal
Electrical
Supply
Maximum
Operating
Voltage
Minimum
Operating
Voltage
Maximum
Furnace
Amperes
Minimum
Wire
Gauge
Maximum
Fuse or Circuit
Breaker Amps
*
045C-23A
45,000
14 1/4
115-60-1
127
103
6.3
14
15
054C-23A
54,000
14 1/4
115-60-1
127
103
6.3
14
15
072C-24B
72,000
17 1/2
115-60-1
127
103
9.7
14
20
072C-35C
72,000
21
115-60-1
127
103
9.0
14
15
090C-24B
90,000
17 1/2
115-60-1
127
103
9.7
14
20
090C-35C
90,000
21
115-60-1
127
103
9.0
14
15
108C-35C
108,000
21
115-60-1
127
103
9.0
14
15
126C-45D
126,000
24 1/2
115-60-1
127
103
15.2
12
30
Thermostat Wire Gauge
Recommended Thermostat Wire Length
2 - wire - Heating
4 or 5 wire - Cooling
24
55 ft.
25 ft.
22
90 ft.
45 ft.
20
140 ft.
70 ft.
18
225 ft.
110 ft.
*
Time-delay fuses or circuit breakers are required.
Table 2. Wire Length & Voltage Specifi cations
Figure 14. Line Voltage Field Wiring
Field Supplied
Disconnect w/in
Sight of Furnace
Field Supplied
Panel Connector
Field Supplied
Fused Service
Panel
Black (Hot)
White (Neutral)
Green or Bare
(Ground)
Black
White
Black
White
Black
White
Field Line Voltage Wiring
Factory Line Voltage Wiring
Ground
Ground
Junction Box (may be int. or ext.
to the furnace). These connections
can be made in the field supplied
disconnect at the furnace.
Ground
Summary of Contents for *SA Upfl ow / Horizontal
Page 35: ...35...