Carrier 50SD030 Installation Instructions Manual

Also see for 50SD024: Operating and maintenance manual Install and operation instructions

Contents

18NOTE: Once the compressor has started and then has stopped, itshould not be started again until 5 minutes have elapsed.The cooling cycle remains on until the room temperature drops toa point that is slightly below the cooling control setting of the roomthermostat. At this point, the thermostat breaks the circuit betweenthermostat terminal R to terminals Y and G. These open circuitsdeenergize contactor coil C and relay coil TDR. The condenser andcompressor motors stop. After a 30--second delay, the blower motorstops. The unit is in a standby condition, waiting for the next call forcooling from the room thermostat.MAINTENANCETo ensure continuing high performance, and to minimize thepossibility of premature equipment failure, periodic maintenancemust be performed on this equipment. This cooling unit should beinspected at least once each year by a qualified service person. Totroubleshoot unit, refer to Table 6, Troubleshooting Chart.NOTE TO EQUIPMENT OWNER: Consult your local dealerabout the availability of a maintenance contract.PERSONAL INJURY AND UNIT DAMAGE HAZARDFailure to follow this warning could result in personal injuryor death and possible unit component damage.The ability to properly perform maintenance on thisequipment requires certain expertise, mechanical skills, toolsand equipment. If you do not possess these, do not attempt toperform any maintenance on this equipment, other than thoseprocedures recommended in the Owner’s Manual.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow these warnings could result in personalinjury or death:1. Turn off electrical power to the unit before performing anymaintenance or service on this unit.2. Use extreme caution when removing panels and parts.3. Never place anything combustible either on or in contactwith the unit.! WARNINGUNIT OPERATION HAZARDFailure to follow this caution may result in equipment damageor improper operation.Errors made when reconnecting wires may cause improperand dangerous operation. Label all wires prior todisconnecting when servicing.CAUTION!The minimum maintenance requirements for this equipment are asfollows:1. Inspect air filter(s) each month. Clean or replace whennecessary.2. Inspect indoor coil, drain pan, and condensate drain eachcooling season for cleanliness. Clean when necessary.3. Inspect blower motor and wheel for cleanliness each coolingseason. Clean when necessary.4. Check electrical connections for tightness and controls forproper operation each cooling season. Service whennecessary.5. Ensure electric wires are not in contact with refrigeranttubing or sharp metal edges.AIR FILTERIMPORTANT: Never operate the unit without a suitable air filterin the return--air duct system. Always replace the filter with the samedimensional size and type as originally installed. See Table 1 forrecommended filter sizes.Inspect air filter(s) at least once each month and replace(throwaway--type) or clean (cleanable--type) at least twice duringeach cooling season and twice during the heating season, orwhenever the filter becomes clogged with dust and lint.INDOOR BLOWER AND MOTORNOTE: All motors are pre--lubricated. Do not attempt to lubricatethese motors.For longer life, operating economy, and continuing efficiency, cleanaccumulated dirt and grease from the blower wheel and motorannually.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Disconnect and tag electrical power to the unit before cleaningand lubricating the blower motor and wheel.! WARNINGTo clean the blower motor and wheel:1. Remove and disassemble blower assembly as follows:a. Remove unit access panel.b. Disconnect motor lead from time delay relay (TDR).Disconnect yellow lead from terminal L2 of the contactor.c. On all units remove blower assembly from unit. Removescrews securing blower to blower partition and slideassembly out. Be careful not to tear insulation in blowercompartment.d. Ensure proper reassembly by marking blower wheel andmotor in relation to blower housing before disassembly.e. Loosen setscrew(s) that secures wheel to motor shaft,remove screws that secure motor mount brackets tohousing, and slide motor and motor mount out ofhousing.2. Remove and clean blower wheel as follows:a. Ensure proper reassembly by marking wheel orientation.b. Lift wheel from housing. When handling and/or cleaningblower wheel, be sure not to disturb balance weights(clips) on blower wheel vanes.c. Remove caked--on dirt from wheel and housing with abrush. Remove lint and/or dirt accumulations from wheeland housing with vacuum cleaner, using soft brushattachment. Remove grease and oil with mild solvent.d. Reassemble wheel into housing.e. Reassemble motor into housing. Be sure setscrews aretightened on motor shaft flats and not on round part ofshaft.f. Reinstall unit access panel.3. Restore electrical power to unit. Start unit and check forproper blower rotation and motor speeds during coolingcycles.50SD