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58SU0A: Installation, Start-up, Operating and Service and Maintenance Instructions
SERVICE AND MAINTENANCE
PROCEDURES
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters.
performed by trained service personnel. A qualified service person
should inspect the furnace once a year.
WARNING
!
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.
servicing.
CAUTION
!
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.
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
orientation to component location accordingly.
ELECTRICAL CONTROLS AND WIRING
WARNING
!
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
All other operations must be
Verify proper operation after
Fig.
4, you must revise your
The electrical ground and polarity for 115-v wiring must be properly
maintained. Refer to
Fig. 24
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.
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
flash code
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. The furnace control LED is either
rapid flashing
or displaying 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. 35
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. Using a length of wire, briefly short the TEST/TWIN terminal to
the C terminal on the furnace control.
2. When above items have been completed, the LED flashes the fault
code history (up to 5 fault codes from newest to oldest). Record the
status code(s) for further troubleshooting.
3.
Check LED status. If no previous faults in the history, control will
flash
status code 11.
4. Component self-test will begin. Refer to Component Test section of
service label for complete test sequence.
26
for field wiring information and to
ON continuously,
and the Service guide at the end of this
Fig. 38
display a 24
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