EPA 609 STUDY GUIDE 2026 QUESTIONS AND ANSWERS
GRADED A+
✔✔A recovery cylinder must not be filled more than ___ % of it's capacity by weight? -
✔✔80%
✔✔How should refrigerant cylinders be shipped? - ✔✔Up-right with proper DOT
classification tags.
✔✔What oil MUST be used with ALL HFC's for HVAC/Refrigeration but will also work
with CFC's and HCFC's. - ✔✔Polyolester
✔✔HCFC's have very low atmospheric concentrations measured in parts per? -
✔✔Trillion
✔✔All cooling systems containing more than 50 lbs. of refrigerant must be repaired
when the annual leak rate exceeds___? - ✔✔15%
✔✔Mineral Oils are used with? - ✔✔All CFC's
✔✔Alkebenzene is used alone or as an additive for? - ✔✔HCFC's (Will also work with
CFC's)
✔✔POE - ✔✔Polyolester
✔✔What is the definition of a Type I Appliance? - ✔✔A small appliance that is
manufactured, charged, and hermetically sealed in a factory with 5 Lbs. of refrigerant or
less.
✔✔What is the definition of a Type II Appliance? - ✔✔High pressure or very high
pressure appliances except for small appliances and motor vehicle air conditioning.
Refrigeration systems containing more than 5 Lbs. of high or very high pressure
refrigerants.
✔✔What is the definition of a Type III Appliance? - ✔✔Low pressure equipment like low
pressure chillers.
✔✔All refrigerants are assumed to be a single chemical if they are numbered what? -
✔✔1-399 and 600 and above.
✔✔What is an Azeotrope? - ✔✔A mixture of two or more liquids in such a ratio that it's
composition cannot be changed by vaporizing it.
, ✔✔Azeotrope's are numbered what? - ✔✔500 to 599
✔✔What is fractionation? - ✔✔When the refrigerant leaks, it leaks out in different rates
due to the different pressures.
✔✔What is Temperature Glide? - ✔✔When the temperature of the vaporizing refrigerant
changes, even though the pressure remains the same.
✔✔What are the two basic types of recovery devices? - ✔✔Self-Contained and System-
Dependent.
✔✔System-Dependent devices may only be used on appliances containing how much
refrigerant? - ✔✔15 Lbs of refrigerant or less
✔✔What MUST be placed on a refrigerant cylinder being returned for reclaiming. - ✔✔A
refrigerant label.
✔✔After completing the transfer of liquid refrigerant between a recovery unit and a
refrigeration system, you should guard against what? - ✔✔Trapping liquid refrigerant
between the service valves.
✔✔When pressurizing a system with nitrogen, you should always? - ✔✔Charge through
a pressure regulator.
✔✔What are the three "R's"? - ✔✔Recover, Recycle, and Reclaim.
✔✔In relation to the three "R's" what is Recover? - ✔✔To remove refrigerant in any
condition from a system and store it in an external approved container.
✔✔In relation to the three "R's" what is Recycle? - ✔✔To clean refrigerant for reuse by
seperating the oil from the refrigerant and removing moisture from the refrigerant by
passing it through one or more filter dryers.
✔✔Can Recycled refrigerant be resold? - ✔✔It cannot be re-sold but it can be re-used.
✔✔In relation to the three "R's" what is Reclaim? - ✔✔To process refrigerant to a level
equal to new (virgin) product specifications as determined by chemical analysis.
✔✔Can Reclaimed refrigerant be resold? - ✔✔Yes, but must meet the standard set
forth in ARI 700 before it can be resold.
✔✔What chemical has been found in the stratosphere indicating ozone depletion? -
✔✔Chlorine Monoxide (CLO)
GRADED A+
✔✔A recovery cylinder must not be filled more than ___ % of it's capacity by weight? -
✔✔80%
✔✔How should refrigerant cylinders be shipped? - ✔✔Up-right with proper DOT
classification tags.
✔✔What oil MUST be used with ALL HFC's for HVAC/Refrigeration but will also work
with CFC's and HCFC's. - ✔✔Polyolester
✔✔HCFC's have very low atmospheric concentrations measured in parts per? -
✔✔Trillion
✔✔All cooling systems containing more than 50 lbs. of refrigerant must be repaired
when the annual leak rate exceeds___? - ✔✔15%
✔✔Mineral Oils are used with? - ✔✔All CFC's
✔✔Alkebenzene is used alone or as an additive for? - ✔✔HCFC's (Will also work with
CFC's)
✔✔POE - ✔✔Polyolester
✔✔What is the definition of a Type I Appliance? - ✔✔A small appliance that is
manufactured, charged, and hermetically sealed in a factory with 5 Lbs. of refrigerant or
less.
✔✔What is the definition of a Type II Appliance? - ✔✔High pressure or very high
pressure appliances except for small appliances and motor vehicle air conditioning.
Refrigeration systems containing more than 5 Lbs. of high or very high pressure
refrigerants.
✔✔What is the definition of a Type III Appliance? - ✔✔Low pressure equipment like low
pressure chillers.
✔✔All refrigerants are assumed to be a single chemical if they are numbered what? -
✔✔1-399 and 600 and above.
✔✔What is an Azeotrope? - ✔✔A mixture of two or more liquids in such a ratio that it's
composition cannot be changed by vaporizing it.
, ✔✔Azeotrope's are numbered what? - ✔✔500 to 599
✔✔What is fractionation? - ✔✔When the refrigerant leaks, it leaks out in different rates
due to the different pressures.
✔✔What is Temperature Glide? - ✔✔When the temperature of the vaporizing refrigerant
changes, even though the pressure remains the same.
✔✔What are the two basic types of recovery devices? - ✔✔Self-Contained and System-
Dependent.
✔✔System-Dependent devices may only be used on appliances containing how much
refrigerant? - ✔✔15 Lbs of refrigerant or less
✔✔What MUST be placed on a refrigerant cylinder being returned for reclaiming. - ✔✔A
refrigerant label.
✔✔After completing the transfer of liquid refrigerant between a recovery unit and a
refrigeration system, you should guard against what? - ✔✔Trapping liquid refrigerant
between the service valves.
✔✔When pressurizing a system with nitrogen, you should always? - ✔✔Charge through
a pressure regulator.
✔✔What are the three "R's"? - ✔✔Recover, Recycle, and Reclaim.
✔✔In relation to the three "R's" what is Recover? - ✔✔To remove refrigerant in any
condition from a system and store it in an external approved container.
✔✔In relation to the three "R's" what is Recycle? - ✔✔To clean refrigerant for reuse by
seperating the oil from the refrigerant and removing moisture from the refrigerant by
passing it through one or more filter dryers.
✔✔Can Recycled refrigerant be resold? - ✔✔It cannot be re-sold but it can be re-used.
✔✔In relation to the three "R's" what is Reclaim? - ✔✔To process refrigerant to a level
equal to new (virgin) product specifications as determined by chemical analysis.
✔✔Can Reclaimed refrigerant be resold? - ✔✔Yes, but must meet the standard set
forth in ARI 700 before it can be resold.
✔✔What chemical has been found in the stratosphere indicating ozone depletion? -
✔✔Chlorine Monoxide (CLO)
