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SERVICE
AND MAINTENANCE
PROCEDURES
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
than
those
procedures
recommended
in the User's Manual.
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.
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.
ENVIRONMENTAL
HAZARD
Failure
to
follow
this
caution
may
result
in
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.
ELECTRICAL CONTROLS AND WIRING
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.
441 01 1402 02
39
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