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ELECTRICAL SHOCK, FIRE OR EXPLOSION

HAZARD

Failure to follow this warning could result in personal

injury or death.
Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF position and

install a lockout tag.

There may be more than one

disconnect switch. Lock out and tag switch with a suitable

warning label. Verify proper operation after servicing.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this caution may result in improper

furnace operation or failure of furnace.
Label all wires prior to disconnection when servicing

controls. Wiring errors can cause improper and dangerous

operation.

CAUTION

INTRODUCTION

GENERAL

These instructions are written as if the furnace is installed in an
upflow application. An upflow furnace application is where the

blower is located below the combustion and controls section of

the furnace, and conditioned air is discharged upward. Since this
furnace can be installed in any of the 4 positions shown in Fig. 4,

you must revise your orientation to component location
accordingly.

ELECTRICAL CONTROLS AND WIRING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.
There may be more than one electrical supply to the

furnace. Check accessories and cooling unit for additional

electrical supplies that must be shut off during furnace

servicing. Lock out and tag switch with a suitable warning

label.

WARNING

The electrical ground and polarity for 115--v wiring must be
properly maintained. Refer to Fig. 24 for field wiring information

and to Fig. 38 for furnace wiring information.

NOTE

: If the polarity is not correct, the STATUS LED on the

control will flash rapidly RED and prevent the furnace from
heating. The control system also requires an earth ground for
proper operation of the control and flame--sensing electrode.
The 24--v circuit contains an automotive--type, 3--amp. fuse
located on the control. (See Fig. 38) Any shorts of the 24--v

wiring during installation, service, or maintenance will cause this

fuse to blow. If fuse replacement is required, use ONLY a 3--amp.
fuse. The control LED will display a three flash AMBER code

when fuse needs to be replaced.
Proper instrumentation is required to service electrical controls.

The control in this furnace is equipped with a multi--colored

Status Code LED (Light--Emitting Diode) to aid in installation,
servicing, and troubleshooting. The furnace control LED is either

ON continuously, rapid flashing, or displaying a flash code in one
of three colors (Red, Green, or Amber).
For an explanation of status codes, refer to service label located
on blower access door or Fig. 35 and the Service guide at the end

of this manual.
See Fig. 35 for a summary of fault codes and a brief explanation

of fault codes.
The stored status code will not be erased from the control
memory, if 115-- or 24--v power is interrupted.

1. To retrieve status code, proceed with the following:

NOTE

: NO thermostat signal may be present at control, and all

blower--OFF delays must be completed.

a. Remove outer access door.

b. Remove inner blower door.

c. Close blower door interlock switch.

d. Depress and hold SW1 button once (for less than 5

seconds).

2. When above items have been completed, the LED flashes