Maytag MFI2266AES Service Manual - Page 11
Caution - specifications
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Service Procedures ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test procedures require power to be connected. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational. Refrigerant Precautions ! WARNING To avoid risk of personal injury, do not allow refrigerant to contact eyes or skin. ! CAUTION To avoid risk of property damage, do not use refrigerant other than that shown on unit serial number identification plate. NOTE: All precautionary measures recommended by refrigerant manufacturers and suppliers apply and should be observed. Line Piercing Valves Line piercing valves can be used for diagnosis, but are not suitable for evacuating or charging due to holes pierced in tubing by valves. NOTE: Do not leave line piercing valves on system. Connection between valve and tubing is not hermetically sealed. Leaks will occur. Open Lines During any processing of refrigeration system, never leave lines open to atmosphere. Open lines allow water vapor to enter system, making proper evacuation more difficult. Compressor Operational Test (short term testing only) If compressor voltage, capacitor, overload, and motor winding tests are successful (do not indicate a fault), perform the following test: 1.Disconnect power to unit. 2.Discharge capacitor by shorting capacitor terminals through a resistor. NOTE: Not all units have run capacitor. 3.Remove leads from compressor terminals. 4.Attach test cord to compressor windings. • Common lead on test cord attaches to C terminal on compressor. • Start lead on test cord attaches to S terminal on compressor. • Run lead on test cord attaches to R terminal on compressor. To AC supply Switch Fuses Compressor CS R Capacitor Attaching Capacitor for Compressor Test 5. Connect a known good capacitor into circuit as shown above. For proper capacitor size and rating, see technical data sheet for unit under test. NOTE: Ensure test cord cables and fuses meet specifications for unit under test (see Technical Sheet for unit under test). 6. Replace compressor protector cover securely. 7. Plug test cord into outlet, then press and release start cord switch. ! CAUTION To avoid risk of damage to compressor windings, immediately disconnect (unplug) test cord from power source if compressor does not start. Damage to compressor windings occurs if windings remain energized when compressor is not running. If compressor runs when direct wired, it is working properly. Malfunction is elsewhere in system. If compressor does not start when direct wired, recover system at high side. After the system is recovered, repeat compressor direct wire test. If compressor runs after system is recovered (but would not operate when wired direct before recovery) a restriction in sealed system is indicated. If motor does not run when wired direct after recovery, replace faulty compressor. ©2006 Maytag Services 16026312 11