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EPA 608 P/T Chart
Practice using P/T chart for all sections of EPA 608
| Question | Answer |
|---|---|
| Which of following gases is used as baseline measurement for global warming potential (GWP)? | carbon dioxide (labeled as R-744 on P/T chart) |
| R-410A has global warming potential (GWP) how much greater compared to R-744? | thousands of times greater (found on top of P/T chart: R-410A GWP = 2090, R-744 GWP = 1) |
| Global warming potential of R-600a and R-441A are ______ when compared to the GWPs of R-134a, R-407C, R-404A, and R-410A. | significantly lower (found on top of P/T chart: R-600a and R-441A have GWPs in single digits vs. R-134a, R-407C, R-404A, and R-410A have GWPs in thousands) |
| Which of following refrigerants is an HFO? | R-1234ze (found on top of P/T chart) |
| Which of following refrigerants has GWP of 1? | carbon dioxide (labeled as R-744 on P/T chart) |
| Recovery cylinder which is half full of recovered R-410A at 90 degrees F, in absence of non-condensables, will be pressurized to: | 300psig (rounded from 275psig on P/T chart for R-410A at 90 degrees F saturation temperature) |
| Recovery cylinder which is half full of recovered R-12 at normal room temperature (about 75 degrees F). in absence of non-condensables, will be pressurized to: | 75psig (rounded from 76.8psig on P/T chart for R-12 at 75 degrees F saturation temperature) |
| Very high pressure appliance is one that uses refrigerant with liquid phase saturation pressure above 355psig at 104 degrees F. This definition includes which refrigerant? | R-744 (only refrigerant listed as very high pressure on top of P/T chart) |
| Recovery cylinder which is half full of recovered R-134a at normal room temperature (about 75 degrees F), in absence of non-condensables, will be pressurized to: | 80psig (rounded from 78.7psig on P/T chart for R-134a at 75 degrees F saturation temperature) |
| Recovery cylinder which is half full of recovered R-22 at normal room temperature (about 75 degrees F), in the absence of non-condensables, will be pressurized to: | 130psig (rounded from 132psig on P/T chart for R-22 at 75 degrees F saturation temperature) |
| According to ASHRAE Standard 34, what is safety classification of R-123? | B-1 (found on top of P/T chart) |
| When charging R-410A water chiller, you must first charge with vapor to pressure of at least what before switching to liquid charging? | 120psig (rounded from 118psig as corresponding R-410A pressure to closest temperature to 36 degrees F on P/T chart for R-410A) |
| R-123 at pressure of 18 inches Hg vacuum has saturation temperature of: | 40 degrees F (rounded from 18.1 inches Hg vacuum or -18.1 for R-123 on P/T chart then find corresponding saturation temperature in side column) |
| Identify pressure corresponding to 32 degrees F for R-123: | 20 inches Hg vacuum (rounded between 19.5 and 20.7 inches Hg vacuum or -19.5 and -20.7 on P/T chart for nearest R-123 saturation temperatures of 30 and 35 degrees F) |
| Under ASHRAE Standard 34, R-134a is classified as: | A-1 (found on top of P/T chart) |
| Which of following refrigerants has safety classification of B-1? | HCFC-123 (labeled as R-123 on top of P/T chart) |
| R-1234yf at 14.7psia will boil at about: | -20 degrees F (14.7psia = 0psig, use P/T chart to find R-1234yf pressure closest to 0psig, then find corresponding temperature in side column) |
| Which refrigerant is HCFC? | R-124 (found on top of P/T chart) |
| Example of HFC refrigerant is: | R-134a (found on top of P/T chart) |
| Example of HFC refrigerant is: | R-410A (found on top of P/T chart) |
| Which safety classification are both R-22 and R-410A? | A-1 (found on top of P/T chart) |
| What characteristic of R-404A, R-407C, R-422D, and R-422B may lead to them not being used in the future? | high global warming potential (found on top of P/T chart) |
| What safety classification are R-404A, R-407C, R-422D, and R-422B? | A-1 (found on top of P/T chart) |
| What characteristics do R-441A and R-600a share? | all of above (HC refrigerants, low global warming potential, and A3 safety classification) |
| R-134a chiller should be initially charged with vapor to pressure of at least what before switching to liquid charging? | 30psig (rounded from 30.4psig as corresponding pressure to closest temperature to 36 degrees F on P/T chart for R-134a) |
| When charging R-12 refrigeration system that uses water-cooled condenser, you must first charge with vapor to pressure of at least what before switching to liquid charging? | 35 psig (rounded from 32.5psig as corresponding pressure to closest temperature to 36 degrees F on P/T chart for R-12) |
| Refrigerant pressure inside R-410A unit which is at room temperature (72 degrees F) and not operating is: | approximately 210psig (rounded between nearest corresponding R-410A pressures of 201psig for 70 degrees F saturation temperature and 218psig for 75 degrees F) |
| Refrigerant pressure inside R-12 unit which is at room temperature (72 degrees F) and not operating is: | approximately 74psig (rounded between nearest corresponding R-12 pressures of 70.1psig for 70 degrees F saturation temperature and 76.8psig for 75 degrees F) |
| Evaporation temperature of R-134a at 0psig is: | -15 degrees F (rounded from -0.1 inches Hg vacuum for R-134a pressure at -15 degrees F on P/T chart) |
| When charging R-410A system that uses water-cooled condenser, you must first charge with vapor to pressure of at least what before switching to liquid charging? | 120psig (rounded from 118psig for saturation temperature above 36 degrees F on P/T chart for R-410A) |
| Evaporation temperature of R-410A at 100psig is about: | 30 degrees F (rounded from 97psig as nearest R-410A pressure to 100psig) |
| Which refrigerants are HCFCs? | all of above (R-22, R-123, and R-124) |
| Which refrigerants are HFCs? | all of above (R-134a, R-410A, and R-407C) |
| Which refrigerants are HFOs? | all of above (R-1233zd, R-1234yf, and R-1234ze) |
| Which refrigerants are HCs? | both R-441A and R-600a |
| Which refrigerant is CFC? | R-12 (found on top of P/T chart) |
| Example of HCFC refrigerant is: | R-22 (found on top of P/T chart) |
| Which refrigerant listed below is low pressure refrigerant under EPA's refrigerant recycling regulations? | R-123 (found on top of P/T chart) |
| Which of following is very high pressure refrigerant under EPA's refrigerant recycling regulations? | R-744 (found on top of P/T chart) |
| Which of following refrigerants is high pressure refrigerant under EPA's refrigerant recycling regulations? | R-22 (found on top of P/T chart) |
| Which refrigerant is HCFC? | R-123 (found on top of P/T chart) |
| Which refrigerants on P/T chart are exempt from venting prohibition and do not need to be recovered? | R-744 (carbon dioxide) and R-717 (ammonia) |
| Refrigerants CFC-12, HCFC-22, and HFC-134a are all classified as what type of refrigerants? | A-1 (found on top of P/T chart) |
| Which of following refrigerants is classified as very high pressure refrigerant? | R-744 (found on top of P/T chart) |
| Of refrigerants listed below, which has lowest ozone depletion potential? | R-22 (labeled as HCFC on top of P/T chart, which have lower ODP than CFCs) |
| Of refrigerants listed below, which has lowest ozone depletion potential? | R-134a (labeled as HFC on top of P/T chart, which have no ODP vs higher ODPs of refrigerants containing chloring like CFCs and HCFCs) |
| Which refrigerants are classified as low pressure? | R-123, R-245fa, and R-1233zd (found on top of P/T chart) |
| Positive and negative numbers on P/T chart represent what units? | psig (positive) and inches mercury vacuum (negative) |
| How are refrigerants group on P/T chart? | by pressure range (low, medium, high, and very high) |
| How many and what kind of refrigerants list bubble and dew points on P/T chart? | six zeotropic (400 series) blend refrigerants (R-409A, R-404A, R-407C, R-422D, R-422B, and R-441A) |
Created by:
hm2795
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