AHRI PG8JEA Installation, Operating And Service Manual Download

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SERVICE AND MAINTENANCE

PROCEDURES

FIRE, INJURY, OR DEATH HAZARD

Failure to follow this warning could result in personal

injury, death and/or property damage.
The ability to properly perform maintenance on this

equipment requires certain knowledge, mechanical skills,

tools, and equipment. If you do not possess these, do not

attempt to perform any maintenance on this equipment

other than those procedures recommended in the User’s

Manual.

WARNING

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. 25 for field wiring information

and to Fig. 54 for furnace wiring information.

NOTE

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

control will flash rapidly 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. 24.) 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 status code 24 when fuse

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

The control in this furnace is equipped with a Status Code LED

(Light--Emitting Diode) to aid in installation, servicing, and
troubleshooting. Status codes can be viewed at the sight glass in

blower access door. The furnace control LED is either ON
continuously, rapid flashing, or a code composed of 2 digits. The

first digit is the number of short flashes, the second digit is the
number of long flashes.
For an explanation of status codes, refer to service label located

on blower access door or Fig. 50 and the troubleshooting guide
which can be obtained from your distributor.
See Fig. 55 for a brief Troubleshooting Guide.

For Controls With an Amber LED

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. Leave 115--v power to furnace turned on.

b. Remove outer access door.

c. Look into blower access door sight glass for current LED

status.

d. BRIEFLY remove insulated terminal wire from the draft