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 ...
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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