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50SD
Single-Packaged Electric Cooling Units
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A Guide To Operating and Maintaining Your
Single-Package Electric Cooling Unit
NOTE TO INSTALLER
This manual must be left with the equipment owner.
Note to User: Please read all manuals and retain manuals for
future reference.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
!
WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system which
has been under water.
Fig. 1—Unit 50SD
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death.
Before performing recommended maintenance, be sure
the main power switch to unit is turned off.
TO START UNIT
Step 1 —Turn on the electrical power supply to unit.
Step 2 —Select temperature and set system switch to desired
mode.
TO SHUT UNIT OFF
If unit is being shut down because of a malfunction, call your
dealer as soon as possible.
Step 1 —Set temperature switch to OFF.
Step 2 —Turn off the electrical power supply to 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
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from
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
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal in-
jury, death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING MAINTENANCE.
2. 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
reduce sharp edges to a minimum, be extremely careful
when handling parts or reaching into the unit.
AIR FILTERS— Air filter(s) should be checked at least every
3 or 4 weeks 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 1
indicates the correct filter size for your unit. Refer to Fig 2 to
access the filter(s).
To replace or inspect filter(s) (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. nut driver.
EQUIPMENT OWNER
!
WARNING
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ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
Fig. 2—Filter Access Panel—Vertical
Supply Shown
2. Remove the filter(s) by pulling the filter(s) out of the unit. If
the filter(s) is dirty, clean or replace with new one.
When installing the new filter(s), note the direction of the
airflow arrows on the filter frame.
If you have difficulty in locating your air filter(s), or if you have
questions concerning proper filter maintenance, contact your
dealer for instructions. When replacing filters, always use the
same size and type of filter that was supplied originally by the
installer.
Table 1—Indoor-Air Filter Data
UNIT SIZE FILTER SIZE (IN.)
50SD024-030 20x24
50SD036-060 24x36
!
WARNING
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit
can cause loss of efficiency.
FANS AND FAN MOTOR—Periodically check the condition
of fan wheels and housings and fan-motor shaft bearings. No
lubrication of condenser- or evaporator-fan bearings or motors
is required or recommended.
EVAPORATOR AND CONDENSER COILS—Cleaning of
the coils should only be done by qualified service personnel.
Contact your dealer for the required annual maintenance.
CONDENSATE DRAIN—The drain pan 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 in
them and should rarely require additional oil.
CONDENSER FAN
!
WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
ELECTRICAL CONTROLS AND WIRING—Electrical
controls are difficult to check without proper instrumentation;
therefore, if there are any discrepancies in the operating cycle,
contact your dealer and request service.
REFRIGERANT CIRCUIT—The refrigerant circuit is
difficult to check for leaks without the proper equipment;
therefore, if inadequate cooling is suspected, contact your local
dealer for service.
!
WARNING
EXPLOSION AND BURN HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use
all service ports and open all flow-control devices,
including solenoid valves.
UNIT PANELS—After performing any maintenance or
service on the unit, be sure all panels are fastened securely in
place to prevent rain from entering unit cabinet and to prevent
disruption of the correct unit airflow pattern.
REGULAR DEALER MAINTENANCE
In addition to the type of routine maintenance you might be
willing to perform, your unit should be inspected regularly by
a properly trained service technician. An inspection
(preferably each year, but at least every other year) should
include the following:
1. Inspection and, if required, cleaning of the condenser and
evaporator coils.
2. Inspection and, if required, cleaning of the evaporator drain
pan.
3. Inspection and cleaning of blower wheel housing and
motor.
4. Inspection of all supply-air and return-air ducts for leaks,
obstructions, and insulating integrity. Any problems found
should be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure
proper connection.
8. Inspection for leaks in the refrigerant circuit. Pressurecheck to determine appropriate refrigerant charge.
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9. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
Your servicing dealer may offer an economical service
contract that covers seasonal inspections. Ask for further
details.
Complete maintenance instructions can be found in the unit
Installation, Start-Up and Service Instructions.
WARRANTY CERTIFICATES
Unit 50SD has limited warranties. Certificates are located at
the back of this book. Be sure to read the warranty carefully to
determine the coverage for your unit.
BEFORE YOUR CALL FOR SERVICE, CHECK FOR SEVERAL
EASLILY-SOLVED PROBLEMS
If insufficient heating or cooling is suspected:
( ) Check for sufficient airflow. Check the air filter for dirt.
Check for blocked return-air or supply-air grilles. Be sure they
are open and unobstructed. If these checks do not reveal the
cause, call your servicing dealer.
If your unit is not operating at all, check the following list for
easy solutions:
( ) Check to be sure that your thermostat temperature selector
is set below the indoor temperature during the cooling season.
Be sure the system switch is in the COOL position and not in
the OFF position.
( ) If your unit still fails to operate, call your servicing dealer
for troubleshooting and repairs. Specify the model and serial
numbers of your unit. (Record them in this manual in the space
provided.) If the dealer knows exactly which unit you have, he
may be able to offer suggestions over the phone, or save
valuable time through knowledgeable preparation for the
service call.
IN CASE OF TROUBLE
If after performing the above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name
Telephone
Unit Model
Unit Serial Number
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Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4 PC 101 Page 4 Form/Catalog No. OM50-42 Printed in U.S.A. 8-05 Replaces: New
Tab 1b 1a
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