HVAC CORE EPA

Card Set Information

Author:
blackcat
ID:
213446
Filename:
HVAC CORE EPA
Updated:
2013-04-14 15:49:29
Tags:
Alternate refrigerants
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Description:
HVAC flashcards
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The flashcards below were created by user blackcat on FreezingBlue Flashcards. What would you like to do?


  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

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