Table I-Indoor=Air Filter Data
UNiT SIZE FILTER SIZE
48SD024=036 20 × 24
48SD042-060 24 x 36
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard proce-
dure.
For your safety, keep the unit area clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
To ensure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance fl'om the
top of the unit is 48 in. Clearance of at least 36 in. is required on
sides except the power entry side (42 in. clearance) and the duct
side (12 in. minimum clearance).
MAINTENANCE AND CARE FOR THE EQUIPMENT
OWNER
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
TURN OFF ALL ELECTRICAL POWER TO YOUR UNIT
AND INSTALL LOCK-OUT TAG BEFORE SERVICING
OR PERFORMING MAINTENANCE.
CUT HAZARD
Failure to follow this caution could result in personal injury.
When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal parts
and screws. Although special care is taken to keep sharp
edges to a minimum, 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 at least every 3 months and
changed or cleaned whenever it becomes dirty. Dirty filters
produce excessive stress on the blower motor and can cause the
motor to overheat and shut down. Table I indicates the correct
filter size for your unit. Refer to Fig. 6 to access the filters.
To replace or inspect filters (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the filter(s)
is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow"
arrow's on the filter frame.
If you have difl'iculty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, ahvays use the same size and
type of filter that was supplied, originally, by the installer.
ACCESS PANEL
PI_ERACCESS
PANEL*
*For accessory filter rack
C99050
Fig. 6-Filter Access Panel=Vertical Supply Shown
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Never operate your unit without the filter(s) in place. An
accumulation of dust and lint on internal parts of your unit
can cause loss of efficiency and blower motor and/or com-
pressor damage.
FANS AND FAN MOTORS
Periodically, check the condition of fan wheel and housing and
fan-motor shaft bearings. Contact your dealer for the required
annual maintenance.
HEAT EXCHANGER
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance person
before each heating season, and cleaned when necessary. This
checkout should not be attempted by anyone not having the
required expertise and equipment to properly do the job. Contact
your dealer for the required periodic maintenance.
EVAPORATOR AND CONDENSER COILS
Cleaning of the coils should only be done by qualified service
personnel. Contact your dealer for the required annual mainte-
nance.
CONDENSATE DRAIN
The condensate drain and condensate drain line should be checked
and cleaned at the same time the cooling coils are checked by your
dealer.
COMPRESSOR
All compressors are factory-shipped with a normal charge of the
correct type refrigeration grade oil. A compressor should rarely
require additional oil.
CONDENSER (OUTDOOR) FAN
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Do not poke sticks, screwdrivers, or any other objects into
revolving fan blades.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
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