Low Voltage Wiring - Nordyne 80+ AFUE *SA Installation Instructions Manual

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
to the black wire. The furnace will not operate unless
the polarity and ground are properly connected as
shown in Figure 13.

Low Voltage Wiring

The thermostat must be installed according to the
instructions supplied by the thermostat manufacturer. Low
voltage connections (24 VAC) from the thermostat are
wired to the terminal strip on the integrated control in the
furnace. See Figure 14 (page 19) for proper connections
Furnace
Furnace
Model
Input
Number
(Btuh)
*SA/*SK
045(†)-23A 45,000
054(†)-23A 54,000
072(†)-24B 72,000
072(†)-35C 72,000
090(†)-24B 90,000
090(†)-35C 90,000
108(†)-35C 108,000
126(†)-45D 126,000
†
( ) "C" = Standard Models, "N" = 80% Low NOx Models
σ
Time-delay fuses or HACR-type circuit breakers are required.
Thermostat Wire Gauge
24
22
20
18
Black (Hot)
White (Neutral)
Green or Bare
(Ground)
18
Cabinet Nominal
Width Electrical
(in.) Supply
14 1/4 115-60-1
14 1/4 115-60-1
17 1/2 115-60-1
21 115-60-1
17 1/2 115-60-1
21 115-60-1
21 115-60-1
24 1/2 115-60-1
Table 2. Wire Length and Voltage Specifi cations
Field Supplied
Field Supplied
Fused Service Disconnect w/in
Panel Sight of Furnace
Black
White
Ground
Field Line Voltage Wiring
Factory Line Voltage Wiring
Figure 13. Line Voltage Field Wiring
for heating only (two-wire) and heating/cooling (four-wire)
applications. Recommended minimum wire gauge for
thermostat wiring is shown in Table 2.
The thermostat must not be installed on an outside wall or
any other location where its operation may be adversely
affected by radiant heat from fi replaces, sunlight, or lighting
fi xtures, and convective heat from warm air registers or
electrical appliances.
The six pin terminal marked "Expansion Port" is not used
in the single stage furnace as shipped from the factory. It
is used for the furnace control board to communicate to
a fi xed speed or variable speed high effi ciency motor that
may be optionally installed. Please contact your distributor
for the proper upgrade motor kit.
Maximum Minimum
Operating Operating
Voltage Voltage
127 103
127 103
127 103
127 103
127 103
127 103
127 103
127 103
NOTES:
Recommended Thermostat Wire Length
2 - wire
(Heating)
55 ft.
90 ft.
140 ft.
225 ft.
Junction Box (may be int. or ext.
to the furnace). These connections
can be made in the field supplied
disconnect at the furnace.
Black
White
Ground
Field Supplied
Panel Connector
Maximum Minimum
Furnace Wire
Amperes Gauge
6.3 14
6.3 14
9.7 14
9.0 14
9.7 14
9.0 14
9.0 14
15.2 12
4 or 5 wire
(Cooling)
25 ft.
45 ft.
70 ft.
110 ft.
Black
White
Ground
Maximum
Fuse or Circuit
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Breaker Amps
15
15
20
15
20
15
15
30