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935SB: Installation, Start-up, Operating and Service Maintenance Instructions
SERVICE AND MAINTENANCE PROCEDURES
Untrained personnel can perform basic maintenance functions such as
cleaning and replacing air filters. All other operations must be performed
by trained service personnel. A qualified service person should inspect
the furnace once a year.
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 3 positions (see
Fig.
component location accordingly.
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 service and
maintenance on this equipment other than those procedures
recommended in the Owner's Manual.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental pollution.
Remove and recycle all components or materials (i.e. oil, refrigerant,
control board, etc.) before unit final disposal.
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death,
or property damage.
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. Always reinstall access doors after completing service and
maintenance.
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.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental pollution.
Remove and recycle all components or materials (i.e. oil, refrigerant,
control board, etc.) before unit final disposal.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4), you must revise your orientation to
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.
The electrical ground and polarity for 115-V wiring must be properly
maintained. See field wiring information (see
wiring information (see
Fig.
NOTE: If the polarity is not correct, the STATUS LED on the control
will flash rapidly and Status code (10.1 ) is displayed. This will prevent
the furnace from heating.
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.
42. Any shorts of the 24-V wiring during
installation, service, or maintenance will cause
replacement is required, use ONLY a 3-amp. fuse. The control LED will
display status code (24.1) when fuse needs to be replaced.
Proper instrumentation is required to
control in this
furnace is equipped with a Status Code LED
(Light-Emitting Diode) and Major/Minor 3 digit codes to aid in
installation, servicing, and troubleshooting. The furnace control LED is
either ON continuously, rapid flashing or displaying a code composed of
2 digits. The major status code is displayed on the LED indicator
through the door with the first digit being the number of short flashes
and the second digit being the number of long flashes. The major status
code is displayed in the first 2 digits of the display. The minor status
code is displayed in the third digit.
For an explanation of status codes, refer to service booklet located on
blower access door (see
Fig.
Service guide at the end of this manual.
Retrieving Stored Fault Codes
The stored status code will not be erased from the control memory, if
115- or 24-V power is interrupted. See the Service Label,
more information.
1. To retrieve the last 7 fault 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 blower access door.
b. Depress blower door switch to energize the control board.
!
SHOCK HAZARD
Failure to follow this caution could result in personal injury.
Do not tape or permanently allow the door switch to be bypassed.
Temporarily press the door switch with one hand while accessing the
service buttons with your other hand. Do not touch uninsulated
electrical components.
c. Press menu/select button until (FLt) is displayed.
d. Press Next/Option button to cycle through the fault history.
Faults remain in memory for 72 hours with the board powered
after the last fault occurs. Faults may be manually cleared by
selecting (CLr) with the menu/select button.
55
WARNING
Fig.
41) and for furnace
62).
The control system also requires an earth
this fuse to blow. If fuse
service electrical controls. The
61), by scanning the QR code or see
CAUTION
Fig. 61
for
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