Introduction to Commercial Refrigeration Systems : Commercial Refrigeration Accessories

 Overview:

• Commercial refrigeration systems may require additional components depending on the application.
• These components help protect the system and ensure proper operation.

Key Components:

1. Accumulators:

   • Function: Prevent liquid floodback to the compressor during the run cycle.
   • Operation: Collect liquid refrigerant from the suction line, allowing it to boil off before entering the compressor.
   • Installation: Should not be insulated, enabling them to pick up heat and vaporize accumulated liquid.

2. Oil Separators:

   • Function: Separate oil from high-temperature refrigerant in the compressor discharge line and return it to the compressor crankcase.
   • Additional Components:
     • Oil Reservoirs: Hold oil until needed by the compressor.
     • Oil Regulators: Maintain the proper oil level in the compressor's crankcase.

3. Liquid Receivers:

   • Function: Hold surplus refrigerant for high load periods.

4. Liquid Line Solenoid Valve (Pump Down Solenoid Valve):

   • Function: Automatically pumps refrigerant out of the low side on each off cycle to prevent refrigerant migration and flooded starts.
   • Type: Normally closed solenoid valve.

Refrigerant Considerations:

• Specific Parts Compatibility: Some components may only work with certain refrigerants.
• Safety: Refrigerants should be detectable, safe for humans, and environmentally friendly.
• Environmental Regulations:
  • R-404A: Widely used since the 1990s but banned for new systems starting January 1, 2020, due to high global warming potential.
  • Historical Context:
    • In 1987, a global mandate to phase out CFCs and HCFCs due to their ozone depletion potential.
    • In 2016, the United Nations initiated plans to limit global temperature increase by phasing out high global warming potential refrigerants.
  • Technician Awareness: Stay updated on refrigerant regulations.

Business Considerations:

• Qualities to Evaluate: Warranty, compliance, efficiency, cost, capacity, reliability, and maintenance.
• Importance: Choosing the right component is crucial for avoiding additional costs and ensuring system reliability.