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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.
Flue Passages (Qualified Servicer Only)
At the start of each heating season, inspect and, if necessary,
clean the unit flue passage.
Cleaning Flue Passages (Qualified Servicer
Only)
1. Shut off electric power and gas supply to the unit.
2. Remove burner assembly by disconnecting the gas line and
removing the manifold bracket from the partition panel.
3. Remove the flue from the induced draft blower and the
collector box cover from the partition panel.
4. The primary heat exchanger tubes can be cleaned using a
round wire brush attached to a length of high grade stainless
steel cable, such as drain cleanout cable. Attach a variable
20
Flame
Sensor
Flame Sensor
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