OPERATINGYOURUNIT
Theoperationofyourunitiscontrolledbythe indoor temperature
control (thermostat). You simply adjust the thermostat and it main-
tains the indoor temperature at the level you select. Most thermostats
of heating and cooling systems have 3 controls: a temperature con-
trol selector, a FAN control, and a SYSTEM or MODE control. Re-
fer to your thermostat owner's manual for more information.
To better protect your investment and to eliminate unnecessary ser-
vice calls, familiarize yourself with the following facts:
Cooling Mode
With the SYSTEM control set to COOL, your unit will run in cool-
ing mode until the indoor temperature is lowered to the level you
have selected. On extremely hot days, your unit will run for longer
periods at a time and have shorter "off' periods than on moderate
days.
Gas Heat Mode
With the SYSTEM or MODE control of your indoor thermostat set
to HEAT, your unit will run in heating mode until room temperature
is raised to the level you have selected. On cold days and nights,
your system will typically run for longer periods of time and have
shorter "off' periods than on moderate days.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed on
your system. Most maintenance should be performed by your deal-
er. You, asthe owner, may wish to handle some nfinor maintenance
for your new unit.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
For your safety, keep the unit area clear and free of combustible ma-
terials, gasoline, and other flamnaable liquids and vapors.
To assure proper functioning of the unit, flow of condenser airmust
not be obstructed from reaching the unit. Clearance from the top of
the unit is 48 in. (1219 ram). Clearance of at least 36 in. (914 ram)
is required on sides except the power entry side (42 in. (1067 ram)
clearance) and the duct side (12 in. (305 ram) nfininmm clearance).
Also, ensure that the return-air duct connection (s) is physically
sound, is sealed to the furnace casing, and ternfinates outside the
space containing the furnace.
Maintenance and Care for the Equipment Owner
Before perfornfing equipment maintenance yourself, please care-
fully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CUT HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
1. Turn off gas supply first, then all electrical power to your
unit and install lock-out tag before servicing or perform-
ing maintenance.
2. When removing access panels or perfornfing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care is taken to reduce
sharp edges to a nfininmm, be extremely careful when
handling parts or reaching into the unit. Wear safety
glasses, gloves, and appropriate protective clothing.
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce exces-
sive stress on the blower motor and can cause themotor to overheat
and shut down.
This unit nmst have air filters in place before it can be operated.
These filters can be located in one of at least two places. In many ap-
plications, the installer will provide return air filter grilles mounted
on the wall or ceiling of the conditioned structure. In the instance of
filter grilles, the filters can simply be removed from the grille and re-
placed.
The other typical application is an accessory filter rack installed in-
side the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
Table 1 indicates the correct indoor filter size for your unit. Refer
to Fig. 2 to access filters installed in the accessory filter rack. Ifusing
an Accessory Filter Rack, refer to the Installation Instructions pro-
vided with it for correct filter sizes and quantities.
Table 1--Indoor Air Filter Data
Unit Size Filter Size
48ES024040 20x20x1 (508x508x25 mm)
48ES024060,48ES030 20x24x1 (508x610x25 mm)
48ES036 - 48ES042 24x30x1 (610x762x25 mm)
48ES048 - 48ES060 24x36x1 (610x914x25 mm)
13urners
Flue
Gas V:Jlve Ilood
A08582
Fig. 3 - Gas Heating/Electric Cooling Unit with access panel
removed
To replace or inspect filters in accessory filter rack (See Fig. 2):
1. Remove the filter access panel using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling itout ofthe unit. If the filter(s)
is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction ofthe airflow ar-
rows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for in-
structions. When replacing filters, always use the same size and type
of filter that was supplied originally by the installer.
UNIT OPERATION HAZARD
Failure to follow this caution may result in property damage.
Never operate your unit without filters in place. An
accunmlation ofdust and lint on internal parts of your unit can
cause loss of efficiency and blower motor and/or compressor
damage.
