50SX
Single-Packaged Cooling Units
A Guide to Operating and
Maintaining Your Cooling Unit
NOTE TO INSTALLER:
This manual should be left with the equipment
owner.
Before performing recommended maintenance, be sure
main power switch to unti is turned off. Electrical shock
could cause personal injury.
Models 50SX Single Packaged Cooling Units Without Base Rail
Models 50SX Single Packaged Cooling Units With Optional Base Rail
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 101 Catalog No. 535-00089 Printed in U.S.A. Form OM50-38 Pg 1 1-03 Replaces: 50SS,SX-2SO
Tab 1b 6b
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• More than the usual number of people are present in the
home
CHECK THE AIR FILTER
A dirty air filter will cause excessive strain on the compres-
sor and blower motor. This can cause the components to over-
heat and automatically shut down. In the extreme, the com-
ponents 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.
• More than the normal number of electric lights are in use
• Drapes are open on the sunny side of the home
HEATING CYCLE
If you own a packaged air conditioner that includes electric
heat as an accessory, you need only program your thermo-
stat for heating.
With the SYSTEM switch of your indoor thermostat set to
the HEAT position, the heating section of your home com-
fort system will operate until room temperature 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 colder days and nights than on moderate ones.
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 BE-
FORE BEING REINSTALLED. To avoid prolonged shut-
down of your unit while a filter is drying, you should have
an extra filter on hand. This would allow you to rotate be-
tween the two with minimal downtime for your comfort sys-
tem. Extra filters may be purchased from your dealer.
The filter(s) and filter rack for a packaged system are sup-
plied and installed by the contractor or dealer. Typically, the
filter(s) and rack are located in the return-air duct at the out-
door unit or behind the return-air grille(s). Have your dealer
show you the location of your filter(s) and the procedures
for removal and replacement.
If you have any questions about the removal and/or cleaning
of your filter(s), contact your dealer for assistance.
If grass clippings, leaves, shrubbery, and debris are kept away
from the unit, minimal care should be sufficient to keep the
system functioning properly. However, if the outdoor coil
becomes dirty, use a brush or vacuum cleaner and soft brush
attachment to clean the exterior surface. If dirt is deep in the
coil, contact your dealer for service. The outdoor fan motor
may have to be disconnected and the top panel removed to
gain access to the coil for thorough cleaning. Do not attempt
this yourself.
PERFORMING ROUTINE MAINTENANCE
With the proper maintenance and care, your air conditioner
will operate economically and dependably. Maintenance can
be accomplished easily by referring to the following direc-
tions. However, before performing maintenance, consider these
important safety precautions:
UNIT SUPPORT
Your packaged unit should be maintained at a level position.
If its support should shift or settle so that the unit is no longer
level, you should correct the condition. Relevel it promptly
to assure condensate drainage out of the unit. If you notice
that water or ice collects beneath the unit, arrange for it to
be drained away from the unit.
• DISCONNECTALL ELECTRICAL POWER TO THE AIR
CONDITIONER BEFORE REMOVING ACCESS PAN-
ELS TO PERFORM SERVICE OR MAINTENANCE. For
a packaged air conditioner unit, disconnect power to the unit
and any supplemental electric heaters.
BEFORE YOU REQUEST A ‘‘SERVICE CALL’’
BEFORE YOU CALL FOR SERVICE, CHECK FOR
THESE EASILY SOLVED PROBLEMS:
Check the indoor and outdoor disconnect switches. Verify
that circuit breakers are ON or that fuses have not blown.
Check for sufficient airflow. Check the air filter(s) for any
accumulations of dirt. Check for blocked return-air or supply-
air grilles. Be sure grilles are open and unobstructed.
NOTE: THERE MAY BE MORE THAN ONE ELECTRI-
CAL DISCONNECT SWITCH.
• ALTHOUGH SPECIAL CARE HAS BEEN TAKEN TO
MINIMIZE SHARP EDGES IN THE CONSTRUCTION OF
YOUR UNIT, BE EXTREMELY CAREFUL WHEN HAN-
DLING PARTS OR REACHING INTO THE UNIT.
Check the settings on your indoor thermostat. If you desire
cooling, see that the temperature control selector is set be-
low room temperature and the SYSTEM switch is on the
COOL or AUTO position. If you require warmth, be sure the
temperature control selector is set above room temperature
and the SYSTEM switch is at HEAT or AUTO. The FAN
switch should be set at ON for continuous blower operation
or AUTO if you wish the blower to function only while the
unit is operating.
If your comfort system still fails to operate, contact your ser-
vicing dealer for troubleshooting and repairs. Specify your
apparent problem, and state the model and serial numbers of
your equipment. (You should have them recorded on
page 4 of this booklet.) With this information, your dealer
may be able to offer helpful suggestions over the phone, or
save valuable time through knowledgeable preparation for
the service call.
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REGULAR DEALER MAINTENANCE
FOR THE RECORD
In addition to the routine maintenance that you perform, your
home comfort system should be inspected regularly by a prop-
erly trained service technician. The inspection (preferably
each year, but at least every other year) should include the
following:
Record the model, product and serial numbers of your new
equipment in the spaces provided below. This information,
along with the other ready-reference facts requested below,
will be necessary should you ever require information or serv-
ice.
• Routine inspection of air filter(s). Replacement or clean-
ing as required.
Installation Data
Date Installed
• Inspection and cleaning of the blower wheel, housing, and
motor. Service should include proper lubrication of these com-
ponents.
Dealer Name
Address
City
• Inspection and, if required, cleaning of indoor and out-
door coils.
State
Zip
• Inspection of the indoor coil drain pan, plus the primary
and secondary drain lines. Service should include cleaning
if required.
Telephone
• A check of all electrical wiring and connections.
Unit Data
• A check for secure physical connections of individual com-
ponents within units.
Product No.
Model No.
• Operational check of the air conditioner system to deter-
mine actual working condition. Necessary repair and/or ad-
justment should be performed at this time.
Serial No.
Heater, if applicable:
Part No.
WARRANTIES
Unit 50SX has a separate warranty located at the
back of this book. Be sure to read the warranty care-
fully to determine the coverage for your unit.
Kilowatt Rating
Copyright 2003 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 PC 101 Catalog No. 535-00089 Printed in U.S.A. Form OM50-38 Pg 4 1-03 Replaces: 50SS,SX-2SO
Tab 1b 6b
4
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