Carrier 48DT Series Owner's Information Manual

Also see for 48DT Series: Installation instructions

CondenserFanPERSONAL INJURY AND UNIT DAMAGE HAZARDFailure to follow this warning could result in death, personalinjury and/or property damage.Do not insert sticks, screwdrivers, or any other objects intorevolving fan blades.The fan must be kept free of all obstructions to ensure proper cool-ing. Contact your dealer for any required service.Electrical Controls and WiringElectrical controls are difficult to check without proper instrumenta-tion. If there are any discrepancies in the operating cycle, contactyour local dealer and request service.Refrigerant CircuitThe refrigerant circuit is difficult to check for leaks v,qthout the prop-er equipment. If inadequate cooling is suspected, contact your localdealer for service.EXPLOSION AND BURN HAZARDFailure to follow this warning could result in death, personalinjury and/or property damage.System under pressure. Relieve pressure and recover allrefrigerant before system repair or final unit disposal. Use allservice ports and open all flow-control devices, includingsolenoid valves.Unit PanelsAfter performing any maintenance or service on the unit. be sure allpanels are fastened securely in place to prevent rain from enteringunit cabinet and to prevent disruption of the correct unit airflow pat-tern.Regular Dealer MaintenanceIn addition to the type of routine maintenance you might be willingto perform, your unit should be inspected regularly by a properlytrained service technician. An inspection (preferably each year, butat least every other year) should include the following:1. Inspection and, if required, cleaning of the outdoor andindoor coils.2. Inspection and. if required, cleaning of the indoor coil drainpan.3. Inspection and cleaning of blower wheel housing and motor.4. Inspection of all supply-air and return-air ducts for leaks,obstructions, and insulation integrity. Any problems foundshould 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 assureproper connection.8. Inspection for leaks in the refrigerant circuit. Pressure checkto determine appropriate refrigerant charge.9. Inspection of compressor oil level by service person toensure proper oil level is maintained in the compressor whenit is installed and running.10. Operational check of the unit to determine workingconditions. Repair or adjustment should be made at this time.Your servicing dealer may offer an economical service contract thatcovers seasonal inspections. Ask for further details.Complete service instructions can be found in the unit Installation,Start-up and Service Instructions.Warranty CertificateYour unit has a limited warranty. Be sure to read the warranty care-fully to determine the coverage for your unit.Before you call for service......check for several easily-solved problems.If insufficient heating or cooling is suspected:( ) Check for sufficient airflow. Check the air filter for dirt. Checkfor blocked return-air or supply-air grilles. Be sure they are openand unobstructed. If these checks do not reveal the cause, call yourservicing dealer.If your unit is not operating at all, check the following list foreasy solutions:( ) Check to be sure that the temperature specified by your UserInterface is set below the indoor temperature during the cooling sea-son or above the indoor temperature during heating season. Be surethe User Interface is set to COOL or HEAT and not OFF.( ) If your unit still fails to operate, call your servicing dealer fortroubleshooting and repairs. Specify the model and serial numbersof your unit. (Record them in this manual in the space provided.) Ifthe dealer knows exactly which unit you have, he may be able tooffer suggestions over the phone, or save valuable time throughknowledgeable preparation for the service call.In Case of TroubleIf you perform the steps above and unit performance is still unsatis-factory, shut off the unit and call your dealer.®Turn to the ExpertgTO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the"Heating Equipment" or "Air Conditioning Contractors & Systems" heading for dealer listing by brand name.Have available the Model No., Series Letter. & Serial No. of your equipment to ensure correct replacement part.Copyright 2007 Carrier Corporation Printed in the US.A. Edition Date: 04/07Manufacturer reserves the right to change, at any tirne_ specifications and design without notice and without obligation.Catalol_ No: 0M48-31Replaces: 0M48-23

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