13
XII. Maintenance
WARNING
To avoid death or personal injury due to
electrical shock, disconnect electrical
power before performing any maintenance.
Important Note: Touching the ignitor body with bare fin-
gers, rough handling, or vibration could result in early ignitor
failure. Only a qualified servicer should ever handle the
ignitor.
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 combus-
tion air and a properly operating vent system.
REPLACING OR CLEANING FILTER
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), 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.
MAINTAINING CABINET FINISH
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in area’s with high ultraviolet radiation.
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 lubri-
cated. No additional oiling is required.
FLAME SENSOR (QUALIFIED SERVICER ONLY)
A drop in the flame sensing signal 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 emery cloth or steel
wool (Figure 16).
2. Circulating Air Blower will continue to run for 60, 90, 120
or 150 seconds, depending on the setting.
NOTE: If necessary, adjust fan OFF delay settings to obtain
satisfactory comfort level.
CAUTION
This unit must not be used as a
“construction heater” during the finishing
phases of construction on a new structure.
This type of use may result in premature
failure of the unit due to extremely low
return air temperatures and exposure to
very dirty atmospheres.
TO TURN OFF UNIT
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the unit.
3. Remove the heat exchanger door on the side of the unit
by removing screws.
4. Turn the gas control valve knob to the OFF position. Do
not force. See Figures 11 and 12.
5. Close manual gas shutoff valve external to the unit.
6. Replace the heat exchanger door on the unit.
7. If cooling and/or air circulation will be desired, turn ON
the electrical power.
COOLING STARTUP
NOTE: Check all manual reset limit controls in heating
circuit if cooling mode does not operate.
COMPRESSOR PROTECTION DEVICES
The compressor includes components which are designed
to protect the compressor against abnormal operating con-
ditions.
WARNING
To avoid death or personal injury, always
disconnect electrical power before
inspecting or servicing the unit. All
compressor protection devices reset
automatically, energizing the contactor and
outdoor fan.
OPERATING INSTRUCTIONS (COOLING)
NOTE: Mechanical cooling cannot be reliably provided at
ambient temperatures below 50° F.
1. Turn on the electrical power supply to the unit.
2. Place the room thermostat selector switch in the COOL
position (or AUTO if available, and if automatic
changeover from cooling to heating is desired).
3. Set the room thermostat to the desired temperature.