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HVAC CORE EPA

  1. What is different about any leaks in a system charged with a blended refrigerant ?
    Blended refrigerants leak from a system at uneven rates , because their vapor pressures can vary widely with temperature
  2. What is "temperature glide"?
    Because ternary refrigerant blends are not azeotropes they can be" broken down" into refrigerants with different performance characteristics.Their pressure-versus-temperature curve is not a single discreet line.It is a family of lines.This family of lines is called the "temperature glide"
  3. What is a ternary blend?
    A ternary blend is a blend made by combining three different refrigerants
  4. How should systems using a blended refrigerant be charged?
    The preffered charging method for the blends is to introduce a measured charge of liquid into the high side of a system
  5. Is there a drop in refrigerant  for CFC-12 ?
    Currently there is not a drop in for CFC-12
  6. How do you leak check an HFC-134a system with a partial charge(no HFC-134a detector available)?
    HFC-134a refrigerant charged systems should be leak checked with pressurized nitrogen.
  7. What is the current replacement for CFC-12?
    The current replacement for CFC-12 is HFC-134a
Author
blackcat
ID
213446
Card Set
HVAC CORE EPA
Description
HVAC flashcards
Updated

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