Carrier 73TCA005101B Start-up And Service Instructions

Contents

Table 1 — Model Number NomenclatureCheck clearances around scroll and housing before in-stalling fans. Before securing fan(s) fasteners, rotate fan byhand to ensure ample clearance.Refer to Carrier Standard Service Techniques, Chapters 1and 2, for information on checking motors; removingrefrigerant; adding oil; and evacuating, dehydrating, and charg-ing system. Pay particular attention to all safety warningsfor these procedures.NOTE: In Carrier Standard Service Techniques, refrigerantremoval must always include recovering the refrigerant, notallowing it to escape to the atmosphere.Compressor ReplacementStand clear of compressor terminals when working oncompressors. With system under pressure, terminals mayblow causing personal injury.Observe the same safety procedures for rotary compres-sors as for reciprocating compressors.When changing compressors:1. Follow all safety codes. Reminder: use protective goggles,work gloves, and water-soaked quenching cloth.2. Shut off all electrical power to unit by removing powercord from outlet, then disconnect all wiring from thecompressor.3. Apply field-supplied tap-a-lines to the true (closest tocompressor) suction and discharge connections of thecompressor.4. Recover the refrigerant charge from the unit. After re-covering, cut the discharge and suction line process tubesbelow the tube crimps. If you choose a good tubinglocation for cutting the refrigerant lines initially, the lo-cation is easily accessible when making the final joints.You can braze the oil piping stub into the new compres-sor fittings more easily before the compressor is put backinto the unit.Oil vapor in piping stubs can ignite from torch flameand cause serious injury. Exercise extreme care whenbrazing, and keep brazing cloth and fire extin-guisher handy for emergency use.5. Connect a nitrogen supply to the unit at one of the tap-a-line connectors (5 psig maximum flow), leaving theother connector open to the atmosphere. Braze angle valveswith stubs to each process tube.6. Remove compressor from unit. Refer to Accessing Com-pressor, Fan Motor, Outdoor Coil Sections, page 7.7. Remove tap-a-lines from suction and discharge lines. Care-fully braze the holes closed from where the tap-a-lineswere removed.8. For proper cleaning and flushing, use the CarrierTotalclaimt recovery system or a comparable refriger-ant recycling system.9. Install new compressor and braze into place with field-supplied copper slip couplings.10. Connect wiring: replace wire terminals if necessary.11. Proceed with evacuation and charging. Pinch off lineswhere angle valves were added. Cut off angle valves abovepinch-off, and braze tubes.12. Start up unit.PREVENTIVE MAINTENANCEGeneralCLEANING — Clean cooling coil and condenser (outdoor)coil. Hold flashlight behind coil to see if all spaces are clear.Use a hooked wire to remove dirt. Dust accumulation ob-structs or reduces airflow and results in loss of capacity. Coilsmay be vacuumed when dry. Outdoors, unit can be brushedwith a stiff brush and fins blown out with compressed air.Thoroughly clean basepan, motors, fan wheels, other com-ponents, and all drain passages. Vacuum insulation. Cleanall inside painted surfaces with mild detergent to remove grease.Clean cabinet and grille. Mild detergents reduce electro-static charges on plastic sections of the grille and are goodcleaners. Do not use carbon tetrachloride, solvents, or waxescontaining solvents to clean plastic sections.PAINTING — Paint any parts that show evidence of rustwith a good rust-resistant paint.WIRING — Check all wiring for deterioration and all elec-trical contacts for tightness and lack of corrosion.MOUNTING — Make sure unit is secure in window, andlevel from left to right and from front to rear according toinstallation instructions provided.Check fans to ensure they are correctly positioned, cen-tered in orifice, and tight on shaft.2