Carrier 50SD User Manual

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50SD
Single-Packaged Electric Cooling Units
Visit www.carrier.com
A Guide To Operating and Maintaining Your
Single-Package Electric Cooling Unit
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 ammable vapors and liquids in the vicinity of this or any other appliance.
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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 qualied service technician to inspect the unit and to replace any part of the control system which has been under water.
Fig. 1—Unit 50SD
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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 ammable liquids and vapors.
To assure proper functioning of the unit, ow 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 lter(s) should be checked at least every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty lters produce excessive stress on the blower motor and can cause the motor to overheat and shut down. Table 1 indicates the correct lter size for your unit. Refer to Fig 2 to access the lter(s).
To replace or inspect lter(s) (or accessory lter rack when supplied):
1. Remove the lter access panel using a 5/16-in. nut driver.
EQUIPMENT OWNER
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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 lter(s) by pulling the lter(s) out of the unit. If the lter(s) is dirty, clean or replace with new one.
When installing the new lter(s), note the direction of the airow arrows on the filter frame.
If you have difficulty in locating your air lter(s), or if you have questions concerning proper lter maintenance, contact your dealer for instructions. When replacing lters, always use the same size and type of lter that was supplied originally by the installer.
Table 1—Indoor-Air Filter Data
UNIT SIZE FILTER SIZE (IN.)
50SD024-030 20x24 50SD036-060 24x36
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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 lters in place. An
accumulation of dust and lint on internal parts of your unit can cause loss of efciency.
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 qualied 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
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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 difcult 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 difcult to check for leaks without the proper equipment; therefore, if inadequate cooling is suspected, contact your local dealer for service.
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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 nal unit disposal. Use all service ports and open all ow-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 airow 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. Certicates 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 insufcient heating or cooling is suspected: ( ) Check for sufcient airow. Check the air lter 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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