Approved refrigerant - Study guides, Class notes & Summaries

Ozone depletion is caused by _______ in HFC refrigerants. - Answer-chlorine CFCs and HCFCs ________ making them capable capable of reaching the stratospheric ozone layer. - Answer-do not dissolve in water or easily break down in the atmosphere According to the Rolanda-Molina theory, ________ are destroyed by each chlorine atom in the stratosphere. - Answer-100,000 ozone molecules The stratospheric ozone layer protects us from _______. - Answer-ultraviolet radiation from the sun Which...

Are there drop-in replacements for R-12 systems? Why or why not? CORRECT ANSWERNo 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? CORRECT ANSWEREster based oils and they do not mix with other oils What type of lubricant is used with HCFCs? CORRECT ANSWERAlkylbenzene lubricant What is difference b/w ternary blend a azeotropic blend? CORRECT ANSWERTernary blends are threepart mi...

NATE Air Conditioning and Heat Pump Exam Questions and Answers Updated 2024/2025 (GRADED) The combined output of a heatpump and its auxiliary heat should not exceed the calculated heat loss of a home by more than ____%. - ANSWER-15% What amount of auxiliary electronic heat is needed when the output of a heat pump on a design day equals 18,800 Btuh and the heat loss of a home is 29,700 Btuh? - ANSWER-3.2 kWh The three processes that transfer heat energy are conduction, convection, and _____...

What is a blend of two or more components who's equilibrium vapor phase & liquid phase compositions are the same at a given pressure? - Answer- Azeotrope This is a halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine - Answer- Halocarbon Chlorofluorocarbons (CFCs) consist of? - Answer- Chlorine, fluorine, carbon CFCs are chemically very stable because they contain no? - Answer- Hydrogen CFCs are damaging to what layer of the ozone lay...

Z-51 REFRIGERATION TEST QUESTIONS AND ANSWERS 100% VERIFIED. Efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the following, a more efficient centrifugal compressor operation results from: - correct answer. Lowering the condensing pressure The heat removed from the refrigerant in a condenser is: - correct answer. Sensible and latent heat The refrigerant unit that you have been assigned to is being taken out of service for a major repair....

HVAC: EPA 608 Certification Study Guide with 100% Complete Solutions Are there drop-in replacements for R-12 systems? Why or why not? - Correct 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? - Correct Answer ️️ - Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? - Correct Answer ️️ -Alkylbenzene lubric...

As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere? July 1, 1992. What is the ozone layer and why is it important to us on Earth? Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth. The atom found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is? Chlorine. What is an ozone molecule made of? Three oxygen a...

EPA 608 Type II Sample Test Questions | Latest Version | 2024/2025 | Graded A+ What type of equipment is covered under EPA 608 Type II certification? EPA 608 Type II certification covers high-pressure equipment, including air conditioners, heat pumps, and commercial refrigeration systems. Why is it important to recover refrigerant before opening or disposing of equipment covered under Type II certification? Recovering refrigerant prevents its release into the atmosphere, protecting ...

Written Z51 Questions And Answers Latest Top Score. The efficiency of the refrigerant cycle is affected by the operation of the condenser. of the following. a more efficient centrifugal compressor operation results from: - correct answer. Lowering the condensing pressure The heat removed from the refrigerant in a condenser is: - correct answer. Sensible and latent heat The refrigerant unit that you have been assigned to is being taken out of service for a major repair. you hav...

As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere? a. July 1, 1992 b. July 1, 1993 c. November 14, 1994 d. January 1, 1996 a. July 1, 1992 What is the ozone layer and why is it important to us on Earth? a. Thin layer of R-22 in the atmosphere that filters UV. b. Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth c. Thin layer of CFC ...