Carrier 52S Series Service Technician Manual

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5. Next, test the resistance individually of each wire tothe shell of the compressor. The paint on the com-pressor can prevent good contact between the probeand the metal. The paint should be removed froma small section of the shell of the compressor to ensuregood contact by the meter probe. The volt-ohmmetershould be set to at least the 100X ohm level. Themeasured resistance between each wire and groundshould be infinite or O.L. on the readout. If thereis measurable resistance one of the windings is likelyshorted to ground. See Figure 36.6. A compressor that has a winding to winding short ora winding to compressor shell short is electricallyfailed and needs to be replaced. See the Compres-sor Replacement section for details.COMPRESSOR REPLACEMENTBefore working on the compressor, read the instructionsthoroughly and gather the necessary tools for the job.Review all safety information on unit and in literature.Always turn off all power to unit to avoid the possibil-ity of electrical shock.Consider the following safety issues beforebeginning:• New and unfamiliar tasks should be performedunder the supervision of an experienced servicetechnician.• Personal protective equipment, such as work glovesand safety glasses, should be worn.• The floor around the work area should be clean andfree of debris.• Make sure tools are the correct tools for the joband that they are working properly and in goodcondition.• Never replace a blown fuse without correcting thecause of the original failure. If thermally operated cir-cuit breakers or overloads are tripping, make surethe trip is not due to excessively high temperaturesor loose connections.• When brazing suction and discharge lines, cool thelines with a damp, clean cloth to prevent injury.• Oil may be present in the compressor accumulatorand interconnecting tubing. Use caution when re-moving tubing.For compressors that are known to be dam-aged: Remove refrigerant prior to disconnecting com-pressor wires. Damaged hermetic compressorterminals may become loose and eject from the com-pressor. Wear safety glasses and keep your faceaway from the area above the terminals when remov-ing compressor wires.n TOOLS NEEDED — The following list includes therecommended tools and devices for removing and replac-ing the compressor.1⁄ 2-in. and 3⁄ 8-in. Tube Benders1⁄ 2-in. Nut Driver5⁄ 16-in. Nut DriverFlat Head ScrewdriverPiercing Valve2 Parker Access Valves (Part No. AVUSE-5)Pinch Off ToolFilter Drier for 52SQ Units (Part No. Sporlan C-164S)Filter Drier for 52SC or SE Units (Part No. KH43LG060)Carrier TOTALTESTT Kit (Part No. TT1-001)TotalclaimT SystemCharging Cylinder or an Electronic ScaleRefrigerant-22Tubing CutterTorchNitrogen Cylinder with RegulatorFIGURE 35 — SHORTED/OPEN WINDINGS TESTFIGURE 36 — GROUNDED WINDINGS TEST19