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Exam (elaborations)

HVAC: EPA 608 Certification Study Guide with Complete Solutions

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  • Course
  • EPA 608
  • Institution
  • EPA 608

HVAC: EPA 608 Certification Study Guide with Complete Solutions Are there drop-in replacements for R-12 systems? Why or why not? - Answer️️ -No because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils ...

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  • September 15, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • EPA 608
  • EPA 608
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, ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Monday, September 2, 2024 12:59 PM



HVAC: EPA 608 Certification Study
Guide with Complete Solutions


Are there drop-in replacements for R-12 systems? Why or why not? - Answer✔️✔️-No

because the new refrigerants are incompatible with the oils and lubricants used in R-12

systems.


What type of oil is used in R-134a and what oils will it mix with? - Answer✔️✔️-Ester

based oils and they do not mix with other oils

What type of lubricant is used with HCFCs? - Answer✔️✔️-Alkylbenzene lubricant

What is difference b/w ternary blend a azeotropic blend? - Answer✔️✔️-Ternary blends

are three-part mixtures whereas azeotropic blends are blends of two or more

compounds that act like a single compound.

What is the trait of a hygroscopic lubricant? - Answer✔️✔️-It absorbs (takes on) moisture

What is temperature glide and what type of blend won't have it? - Answer✔️✔️-Temp.

blend is the difference between the dew point and the bubble point

Dew Point - Answer✔️✔️-Occurs when saturation temp in evaporator causes refrigerant

to change from liquid to vapor

Bubble Point - Answer✔️✔️-Occurs when saturation temp in condenser changes

refrigerant from vapor to liquid




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