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Low Flame Signal (Two-Stage Models ONLY)
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating
acts as an insulator causing a drop in the flame signal. If
the flame signal drops below a predetermined value, the
ignition control will display an error code of (1) flash on the
amber diagnostic LED. The unit will continue to operate
until the control can no longer detect flame.
Abnormal Operation - Cooling
Short Cycle Compressor Delay
The automatic ignition control has a built-in feature that
prevents damage to the compressor in short cycling
situations. In the event of intermittent power losses or
intermittent thermostat operation, the ignition control
will delay output to the compressor contactor for three
minutes from the time power is restored. (Compressor
is off a total of three minutes). The diagnostic LED will
flash six (6) times to indicate the compressor contactor
output is being delayed.
NOTE:
Some electronic thermostats also have a built-in
compressor short cycle timer that may be longer than the
three minute delay given above. If you are using an electronic
thermostat and the compressor has not started after three
minutes, wait an additional five minutes to allow the thermostat
to complete its short cycle delay time.
High Pressure Switch/Low Pressure Switch
(5 Ton Models ONLY)
Some models include a high pressure cutout switch and/
or a loss of charge cutout switch. The high pressure
cutout switch protects the refrigeration system from
excessive operating pressures. The loss of charge
cutout switch protects the refrigeration system from very
low operating pressures due to a loss of refrigerant.
Compressor operation will be disabled if either of these
devices opens. If either device opens, the diagnostic red
LED will flash (9) times to indicate that a refrigeration
system pressure switch is open.
MAINTENANCE
Have the gas heating section of the unit checked at least
once a year before the heating season begins, to be sure
that the combustion air inlet and flue outlet hoods are
not blocked by debris, which would prevent adequate
combustion air and a properly operating vent system.
Filter Replacement or Cleaning
A return air filter is not supplied with this unit; however,
there must be a means of filtering all of the return air. The
filter(s) may be located in the return air duct(s), or return
air filter grille(s). Consult with your installing dealer for
the actual location of the return air filter(s) for your unit.
Dirty filters are the most common cause of inadequate
heating or cooling performance. Filter inspection should
be made at least every two months; more often if
necessary because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
with a new, clean filter. Dirty permanent filters should be
washed with water, thoroughly dried and sprayed with a
filter adhesive before being reinstalled. (Filter adhesives
may be found at many hardware stores.) Permanent
filters should last several years. However, should one
become torn or uncleanable, it should be replaced.
Cabinet Finish Maintenance
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
Clean Outside Coil (Qualified Servicer Only)
The coil with the outside air flowing over it should
be inspected annually and cleaned as frequently as
necessary to keep the finned areas free of lint, hair and
debris.
Condenser, Evaporator, and Induced Draft
Motors
Bearings on the air circulating blower motor, condenser
motor and the combustion fan motor are permanently
lubricated. No additional oiling is required.
Flame Sensor (Qualified Servicer Only)
A drop in the flame current can be caused by a nearly invisible
coating on the flame sensor. This coating, created by the
fuel or combustion air supply, can be removed by carefully
cleaning the flame sensor with steel wool.
NOTE:
After cleaning, the microamp signal should be stable
and in the range of 4 - 6 microamps DC.
Flame
Sensor
Flame Sensor
Flue Passages (Qualified Servicer Only)
At the start of each heating season, inspect and, if
necessary, clean the unit flue passage.
