Service And Maintenance Procedures - International comfort products R8MXL Installation Instructions Manual

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 ser-
vice 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
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.
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 4, you must revise your orientation to
component location accordingly.
441 01 6100 01
than those procedures
Specifications are subject to change without notice.
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.
The electrical ground and polarity for 115−v wiring must be
properly maintained. Refer to Figure 26 for field wiring
information and to Figure 25 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 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. 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 status
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 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.
CARE AND MAINTENANCE
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never store anything on, near, or in contact with the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids,
or other volatile fluids.
3. Paint thinners and other painting compounds,
paper bags, or other paper products.
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