Here’s a detailed breakdown of the work a technician typically performs during the compressor replacement in a refrigerator:

1. Initial Assessment

• Customer Inquiry and Problem Diagnosis:
  • Listen to the customer’s complaint (e.g., refrigerator not cooling).
  • Perform a visual and auditory inspection to identify issues (e.g., compressor noise, temperature fluctuation).
• Confirm Compressor Failure:
  • Check if the compressor is running (use a multimeter to test for continuity and check voltage).
  • Inspect the compressor for any signs of overheating, burning smells, or mechanical damage.
  • Evaluate if the compressor is the root cause or if there are other issues like a clogged refrigerant line or thermostat malfunction.

2. Preparing for the Replacement

• Safety Precautions:
  • Disconnect the refrigerator from the power supply.
  • Wear appropriate safety equipment (e.g., gloves, goggles).
  • Place the refrigerator in an accessible area, clear of any obstacles.
• Tools and Equipment:
  • Gather necessary tools: Wrenches, screwdrivers, manifold gauge set, vacuum pump, brazing torch, refrigerant, and leak detector.
  • Get the replacement compressor and any necessary parts (e.g., expansion valve, filter drier).

3. Removing the Old Compressor

• Evacuate Refrigerant:
  • Use a refrigerant recovery machine to safely remove the old refrigerant from the system. This step ensures no refrigerant is released into the atmosphere, complying with environmental regulations.
• Disconnect Power and Wiring:
  • Disconnect any electrical wiring connected to the compressor (power supply, start capacitor, etc.).
• Disconnect Refrigerant Lines:
  • Use appropriate tools to disconnect the refrigerant lines (suction and discharge lines) from the compressor.
• Remove the Compressor:
  • Unscrew or unbolt the compressor from its mounting base.
  • Carefully remove the compressor from the fridge and set it aside for disposal.

4. Install the New Compressor

• Position the New Compressor:
  • Place the new compressor in the designated space and secure it with bolts or screws.
• Connect Refrigerant Lines:
  • Attach the suction and discharge lines to the new compressor. Ensure the connections are tight to avoid refrigerant leaks.
• Reconnect Electrical Wiring:
  • Reconnect the electrical components (wires, start capacitor, relay) to the new compressor.
• Install New Filter Drier (if necessary):
  • If required, replace the filter drier to ensure the system is free of contaminants and moisture.
• Brazing and Leak Testing:
  • Braze the joints where the refrigerant lines connect to the compressor to ensure a proper seal.
  • Use a leak detector or soap solution to check for leaks in the refrigerant lines and compressor connections.

5. Vacuuming and Charging the System

• Vacuum the System:
  • Attach a vacuum pump to the refrigerant lines and run it for a specified time to remove moisture and air from the system.
  • Ensure the system is under a vacuum (measured in microns) for proper performance.
• Charge the System with Refrigerant:
  • Using a manifold gauge set, add the correct type and amount of refrigerant as specified by the manufacturer.
  • Monitor the system's pressure during charging to ensure it is within the recommended range.

6. Testing the Refrigerator

• Power the Refrigerator Back On:
  • Plug the refrigerator back in and switch it on.
• Monitor Compressor Operation:
  • Check the compressor to ensure it’s running smoothly and quietly.
  • Listen for abnormal sounds and verify proper cycling.
• Check Cooling Performance:
  • Use a thermometer to measure the internal temperature of the refrigerator and freezer compartments.
  • Ensure that the temperature reaches and stabilizes within the manufacturer's recommended range.
• Monitor Refrigerant Pressure:
  • Verify that the pressure in the system remains consistent and that the compressor is operating efficiently.

7. Finishing Up

• Clean Up:
  • Dispose of the old compressor and any parts that need replacing (e.g., refrigerant, filter drier) according to local regulations.
  • Clean up any tools and materials used during the repair.
• Customer Briefing:
  • Explain the work done and the status of the refrigerator to the customer.
  • Provide advice on refrigerator maintenance (e.g., keeping vents clear, setting the temperature correctly).
• Final Inspection and Testing:
  • Ensure that the refrigerator is cooling correctly and that there are no issues.
  • Offer a warranty for the new compressor installation, if applicable.

This process requires a skilled technician with knowledge of refrigeration systems and proper handling of refrigerants. It ensures that the refrigerator operates efficiently and effectively after the compressor replacement.