Installation Guide

28
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
as listed in Table 17.
IMPORTANT NOTES:
!N ELECTRICAL DISCONNECT MUST BE INSTALLED READILY
ACCESSIBLEFROMANDLOCATEDWITHINSIGHTOFTHEFURNACE
See &IGUREPAGE28ORTHEWIRINGDIAGRAMLABEL
INSIDEOFTHECONTROLDOOR!NYOTHERWIRINGMETHODS
MUSTBEACCEPTABLETOAUTHORITYHAVINGJURISDICTION
0ROPERLINE VOLTAGE POLARITYMUSTBE MAINTAINEDIN
ORDER FOR THE CONTROL SYSTEM TO OPERATE CORRECTLY
6ERIFYTHEINCOMINGNEUTRALLINEISCONNECTEDTOTHE
WHITEWIREANDTHEINCOMING(/4LINEISCONNECTED
TOTHEBLACKWIRE4HEFURNACEWILLNOTOPERATEUNLESS
THEPOLARITYANDGROUNDAREPROPERLYCONNECTEDAS
SHOWNINFigure 27.
Grounding
WARNING:
4OMINIMIZEPERSONALINJURYTHEFURNACECABINET
MUST HAVE AN UNINTERRUPTED OR UNBROKEN
ELECTRICAL GROUND 4HE CONTROLS USED IN THIS
FURNACE REQUIRE AN EARTH GROUND TO OPERATE
PROPERLY!CCEPTABLEMETHODSINCLUDEELECTRICAL
WIREORCONDUITAPPROVEDFORGROUNDSERVICE
$ONOTUSEGASPIPINGASANELECTRICALGROUND
Figure 27. 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. NOTE: Connections made within the furnace
burner compartment do not require a junction box.
Ground
Furnace
Model
.UMBER
Furnace
)NPUT
"TUH
#ABINET
7IDTH
IN
.OMINAL
Electrical
3UPPLY
-AXIMUM
/PERATING
Voltage
-INIMUM
/PERATING
Voltage
-AXIMUM
Furnace
!MPERES
-AXIMUM
Fuse or Circuit
"REAKER!MPS*
038D-24A 38,000 14 ¼ 115-60-1 127 103 6.6 15
038D-23B 38,000 17 ½ 115-60-1 127 103 10.0 15
054D-24B 54,000 17 ½ 115-60-1 127 103 10.0 15
072D-24B 72,000 17 ½ 115-60-1 127 103 10.0 15
072D-35C 72,000 21 115-60-1 127 103 9.3 15
090D-35C 90,000 21 115-60-1 127 103 15.6 20
108D-45D 108,000 24 ½ 115-60-1 127 103 15.6 20
118D-45D 118,000 24 ½ 115-60-1 127 103 15.6 20
120D-45D 120,000 24 ½ 115-60-1 127 103 15.6 20
4HERMOSTAT7IRE'AUGE
2ECOMMENDED4HERMOSTAT7IRE,ENGTH
WIRE(EATING ORWIRE#OOLING
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.
4ABLE7IRE,ENGTH6OLTAGE3PECIlCATIONS