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10. Inspection of the unit casing for signs of deterioration. 11. Inspection of all electrical wiring and components toassure proper connection. 12. Inspection for leaks in the refrigerant circuit. Pressure- check to determine appropriate refrigerant charge. 13. Operational check of the unit to determine working conditions. Repair or adjustment should be made at this time. 14. Your servicing dealer may offer an economical servicecontract that covers seasonal inspections. Ask for furtherdetails. Complete Service Instructions can be found in the base unitControls, Start-Up, Operation, Service and Troubleshootingliterature. BEFORE YOU CALL FOR SERVICE, CHECK FOR SEVERAL EASILY SOLVED PROBLEMS If insufficient heat or cooling is suspected: ( ) Check for sufficient airflow. Check the air filters for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. Be sure heating and cooling set points are correct. 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 heating temperature set point is set above the indoor temperature during the heating season, or that cooling temperature set point is below the indoor temperature during the cooling season. Be sure the unit on/off switch is in the ON position and not in the OFF position. Be sure unit has been programmed with the appropriate time schedules and desired operating set points. ( ) Is the electrical supply switch ON? Are any fuses blown, or have any of the circuit breakers tripped? ( ) During the heating season, check the manual shutoff valve. Is this lever parallel with the pipe, indicating that the valve is open? Or is the lever at a right angle, indicating that the valve is closed? If closed, has the gas been shut off for safety reasons? Otherwise, you may open the valve and follow the start-up procedures listed in this manual. NOTE: Before proceeding with the next check, turn OFF the electrical power supply to the unit. Open the control access door. ( ) During the heating season, check the control switch on the gas valve. It is in the ON position? If it is not, be sure it has not been turned off for the purpose of safety. Follow the startup procedures in this manual. ( ) 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, unit performance is unsatisfactory, shut off the unit and call your dealer. Dealer’s Name _____________________________________ Telephone No. _____________________________________ Unit Model ________________________________________ Unit Serial Number _________________________________ Unit Address ______________________________________ Bus Number _______________________________________ Copyright 2007 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480045-01 Printed in U.S.A. Form 48Z-5SO Pg 8 7-07 Replaces: 48Z-3SO Book Tab 1a ...

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