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SERVICE AND MAINTENANCE
PROCEDURES
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK
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
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, or property damage.
Before servicing, disconnect all electrical power to
furnace and install a lock out tag. Verify proper operation
after servicing.
CAUTION
!
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in improper
furnace operation.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to
follow
this
environmental pollution.
Remove and recycle all components or materials (i.e.
oil, refrigerant, et.) before unit final disposal.
Step 1 —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 Figure 4, you must revise your orientation
to component location accordingly.
441 01 1402 02
than
those
procedures
caution
may
result in
ELECTRICAL CONTROLS AND WIRING
WARNING
!
ELECTRICAL SHOCK 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
electrical supply to the furnace. Check accessories and
cooling unit for additional electrical supplies that must be
shut off during furnace servicing. Lockout and tag switch
with a suitable warning label. Verify proper operation
after servicing.
The electrical ground and polarity for 115−v wiring must be
properly maintained. Refer to Figure 26 for field wiring
information and Figure 48 for furnace wiring information.
NOTE: If the polarity is not correct, the STATUS LED on the
control will flash a status code 10 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 Figure 25) 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 be off 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. It can be viewed through the
sight glass in blower access door. The furnace control LED is
either ON continuously, flashing a heart beat, or a status
code.
For an explanation of status codes, refer to service label
located on blower access door or Figure 44.
See Figure 49 for a brief Troubleshooting Guide.
STATUS CODE RECOVERY AND COMPONENT TEST
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.
Perform component self−test as shown on the SERVICE
label, located on the of blower access door.
Step 2 —Care and Maintenance
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed
on this equipment. Consult your local dealer about proper
frequency of maintenance and the availability of a
maintenance contract.
39
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