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MAIN
ON
OFF
Fig. 4—Main Electrical
Disconnect
temperature. Typical settings are 78 F
for cooling and 68 F for heating.
The FAN control offers 2 options for con-
trolling the blower: AUTO and ON. When
set to AUTO, the blower will run only
while the thermostat operates the cooling
or heating section. When the FAN control
is set to ON, the blower will run continu-
ously—regardless of whether the cooling
or heating section is operating.
Typically, the SYSTEM or MODE control
on your thermostat offers the following
selections: COOL, OFF, and HEAT. Your
thermostat may also have a fourth selec-
tion, AUTO. Neither the cooling or heat-
ing section will operate when the
SYSTEM or MODE control is set to OFF.
With the SYSTEM or MODE control set
to COOL, the cooling section of your
comfort system will operate when the
indoor temperature rises above the level
that you wish to maintain. With the SYS-
TEM or MODE control set to HEAT, the
heating section will operate automatically
when the indoor temperature falls below
the level that you have selected.
The AUTO selection found on some
thermostats provides for automatic
changeover between cooling and heating
cycles. With the SYSTEM or MODE
control set to AUTO, the cooling section
will operate when the indoor temperature
rises above the thermostat cooling
temperature setting, or the heating
section will operate when the indoor
temperature drops below the thermostat
setting for the heating cycle.
Your thermostat may be PROGRAM-
MABLE or NON-PROGRAMMABLE.
A NON-PROGRAMMABLE thermo-
stat does not allow the temperature set-
tings to be varied throughout the day or
week without physically changing the
settings. A PROGRAMMABLE thermo-
stat allows various daily temperature
changes to be preset. During the winter,
for example, you may wish to "set back"
the temperature of your home at night,
then have the temperature return to
normal prior to waking up. The home's
temperature can then be lowered again
during the day when no one is at home,
but again be at peak comfort level when
your family returns home. During the
summer, the opposite changes might be
programmed. When properly used, the
programming can result in energy sav-
ings on your home's heating and cooling.
COOLING CYCLE
When operating in the cooling cycle,
your air conditioner will run until the
indoor temperature is lowered to the level
you have selected. On extremely hot
days, your air conditioner will run for
longer periods at a time and have shorter
"off" periods than on moderate days.
The following are typical conditions
that add extra heat and/or humidity to
your home and force your cooling unit
to work longer to keep your home
comfortable:
• Entrance doors are frequently opened
and closed
• Laundry appliances are being operated
• A shower is running
• More than the usual number of people
are present in the home
• More than the normal number of
electric lights are in use
• Drapes are open on the sunny side of
the home
HEATING CYCLE
With the SYSTEM or MODE control of
your indoor thermostat set to HEAT, the
heating section of your home comfort
system will operate until room tempera-
ture is raised to the level you have selected.
Of course, the heating unit will have to
operate for longer periods to maintain a
comfortable environment on cooler days
and nights than on moderate ones.
Refer to your furnace User's Manual for
specific information on heating operation.
PERFORMING ROUTINE
MAINTENANCE
With the proper maintenance and care,
your air conditioning unit will operate
economically and dependably. Mainte-
nance can be accomplished easily by
referring to the following directions.
However, before performing mainte-
nance, consider these important safety
precautions:
• DISCONNECT ALL ELECTRICAL
POWER TO THE AIR CONDITIONER
BEFORE REMOVING ACCESS PAN-
ELS OR PERFORMING ANY MAIN-
4
TENANCE. Disconnect power to both the
indoor and outdoor units. NOTE: THERE
MAY BE MORE THAN 1 ELECTRI-
CAL DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS
BEEN TAKEN TO MINIMIZE SHARP
EDGES IN THE CONSTRUCTION OF
YOUR UNIT, BE EXTREMELY CARE-
FUL WHEN HANDLING PARTS OR
REACHING INTO THE UNIT.
CHECK THE AIR FILTER
A dirty air filter will cause excessive
strain on the compressor and blower
motor. This can cause the components to
overheat and automatically shut down. In
the extreme case, the components will
fail and need to be replaced. To avoid
inefficient or failed operation of your
unit, CHECK THE FILTER(S) EVERY
3 TO 4 WEEKS. Replace filter(s) when
necessary, or clean the filter(s) if you
have the reusable type.
Disposable filters should be replaced by
similar, new filters of the same dimensions.
Reusable, permanent filters should be
washed in a solution of cold water
and mild detergent, then rinsed and
thoroughly dried. THE FILTER MUST
BE COMPLETELY DRY BEFORE
BEING REINSTALLED. To avoid pro-
longed shutdown of your unit while a filter
is drying, you should have an extra filter
on hand. This would allow you to rotate
between the 2 with minimal downtime for
your comfort system. Extra filters may be
purchased from your dealer.
There are no filters in the outdoor unit
of a split-system. If your indoor unit is a
gas or oil furnace, refer to your furnace
User's Manual for filter location and
procedures for replacement or cleaning.
If your system includes an indoor fan coil
unit, the filter may be located in the unit
where it connects with the return-air duct
or plenum. (See Fig. 5.) Remove the filter
Fig. 5—Removing Filter
from Fan Coil Unit
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