Installation Guide

20
F(40°C).Forelectricalspecications,refertothe
furnacenameplateorTable2.
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!
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
totheblackwire.Thefurnacewillnotoperateunless
thepolarityandgroundareproperlyconnectedas
showninFigure14.
• Ifreplacinganyoftheoriginalwiressuppliedwith
thefurnace,thereplacementwiremustbecopper
wiringandhaveatemperatureratingofatleast105°
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 15.2 12 30
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Speci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