May 05, 2024  
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IMR 4140 - Metering Device in Varied Apps


Clock Hours: 30

Delivery Mode
on-ground

Course Description:
Students explore the various metering devices used in commercial, industrial, and residential HVAC/R. Students will be able to identify and evaluate each type of metering device based on its intended function. Typical metering device problems associated with each type of system will be addressed and the common symptoms associated with troubleshooting them. Students will be introduced to different refrigerant charging techniques used specifically with different metering devices.  

Student Learning Outcomes:
Students will attain the necessary skills to be able to:

  1. Describe various types of common expansion devices
  2. Explain the function of the Thermostatic Expansion Valve
  3. Describe the components of a TXV
  4. Discuss variations in valve bodies
  5. Define the “diaphragm”
  6. Describe the operation of the needle and seat
  7. Describe the function of the TXV spring
  8. Explain the function of the TXV bulb and transmission tube
  9. List the four main types of TXV bulb charges
  10. Describe the liquid valve charge
  11. Describe the TXV vapor charged sensing bulb
  12. Explain the TXV vapor cross-charged sensing bulb
  13. Describe the TXV with internal equalizer
  14. Explain the operation of a TXV with external equalize
  15. Explain how a TXV responds to load changes
  16. Explain proper TXV selection
  17. Define a “balanced port” TXV
  18. Describe a dual port TXV
  19. Describe a pressure limiting TXV
  20. Discuss servicing the TXV
  21. Discuss correct location of the TXV sensing bulb
  22. Describe the solid state controlled TXV 
  23. Explain the operation of a step motor TXV
  24. Discuss algorithms and PID controllers
  25. Describe the Automatic Expansion Valve
  26. Describe how n AEV responds to load changes
  27. Discuss special considerations for TXV (TEV) AND AXV (AEV)
  28. Explain the operation of the capillary tube
  29. Discuss the operating charge for capillary tube systems
  30. Describe the characteristics of a Thermostatic Expansion valve
  31. Evaluate a refrigeration system and make repairs
  32. Evaluate a capillary tube system
  33. Evaluate a refrigeration system for proper mechanical operation     
  34. Discuss metering device operation and types of metering devices
  35. Describe troubleshooting methods used with TXV
  36. Describe safety considerations when working with metering devices