Hvac metering devices - Study guides, Class notes & Summaries

HVAC: EPA 608 Certification Exam Questions and Answers Latest Updated 2024/2025 (GRADED) 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 diffe...

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...

HVAC II Final Exam Review| 50 Questions |CorrIF a heat pump works normally in the heating mode but will not provide cooling or a defrost mode, which component is most likely defective? - ANSWER Reversing valve Air-to-air heat pumps produce heat by - ANSWER extracting heat from the outdoor air and transferring it to the indoor air In addition to the reversing valve, the other major difference between a heat pump and a cooling only system is - ANSWER heat pumps require two metering devices ...

a (Centrifugal) - Which of the following compressors are considered a dynamic compressor? a. Centrifugal b. Reciprocating d. Rotary c. Scroll b (Superheated vapor / sub cooled liquid) - What is the condition of the refrigerant as it enters and leaves the condensing coil of a typical light commercial HVAC system? a. Vapor / liquid b. Superheated vapor / sub cooled liquid c. Saturated vapor / saturated liquid d. Hot gas / cool liquid b (Thermal expansion valve) - Which o...

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...

How many types of HVAC certifications are there? - Answer- There are 4 types. What does a metering device do? - Answer- The metering device causes a reduction in pressure, and therefore a reduction in saturation temperature. What is absorbed in the evaporator? - Answer- Heat is absorbed in the evaporator. What happens in the evaporator? - Answer- Heat is absorbed in the evaporator and causes the refrigerant to boil from liquid to vapor. At the outlet of the evaporator the refrigerant...

HVAC Test with Complete S Second hand smoke - Answer-ETS Drain pan - Answer-"A" Coil Orfice - Answer-TXV capillary 98.6 - Answer-body temperature Wet-bulb depression - Answer-Wet-bulb and dry-bulb called 8'F - Answer-Elf the drywall temperature is 76 fahrenheit in a wet bulb temperature is 68 Fahrenheit with depression is 100% - Answer-When a dry rub and wet bulb temperature are the same they related to human of the air is Enthalpy - Answer-Of air is the measure of hea...

HVAC II Final Exam Review| 50 Questions | Correct Answers IF a heat pump works normally in the heating mode but will not provide cooling or a defrost mode, which component is most likely defective? - ANSWER Reversing valve Air-to-air heat pumps produce heat by - ANSWER extracting heat from the outdoor air and transferring it to the indoor air In addition to the reversing valve, the other major difference between a heat pump and a cooling only system is - ANSWER heat pumps require two ...

Mixed refrigerant should They're not easy to reclaim or separate should be labeled and sent to recycling plant can be returned for recycling plant charge a substantial fee for destroying What refrigerant is a HFC R 134 a An azeotrope refrigerant is a mixture of 2 or more refrigerants that behave like a single refrigerant What is the highest SHARE safety standard given to a refrigerant A1 What is a HCFC Hydrochlorofluorocarbon Refrigerant entering the comp...

EPA 608 HVAC Certification Study Guide Q&A Verified 100% Are there drop-in replacements for R-12 systems? Why or why not? - 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? - Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? - Alkylbenzene lubricant What is difference b/w ternary blend a azeotropic blend? - Ternary blends ...