{"title":"EPA 608 Type II Practice Exam - High-Pressure Systems","description":"Type II certification covers high-pressure refrigerants in systems larger than small appliances. This includes residential and commercial air conditioning, heat pumps, and medium-temperature refrigeration using R-22, R-410A, R-134a, R-404A, and similar refrigerants. Passing score: 70% (18 of 25 correct).","passing_score":70,"module_links":[{"url":"/pages/epa-608-type-ii-guide","text":"Module 6: Type II High-Pressure Systems"},{"url":"/pages/epa-608-module-4","text":"Module 4: Recovery Procedures"}],"questions":[{"question":"Type II certification covers refrigeration and air conditioning equipment that uses:","options":["Low-pressure refrigerants in centrifugal chiller applications","High-pressure refrigerants in systems larger than small appliances","Any system containing more than 50 pounds of refrigerant","Only systems using R-22 refrigerant in residential applications"],"correct":1,"explanation":"Type II certification covers high-pressure refrigerants (such as R-22, R-410A, R-134a, R-404A) in systems that are larger than small appliances (more than 5 lbs charge). This includes residential and commercial air conditioners, heat pumps, and medium-temperature commercial refrigeration.","topic":"Classification"},{"question":"Which of the following is classified as a high-pressure refrigerant for Type II purposes?","options":["R-11 (CFC-11) - used in centrifugal chillers","R-113 (CFC-113) - used in large industrial systems","R-123 (HCFC-123) - used in modern centrifugal chillers","R-22 (HCFC-22) - used in residential air conditioning"],"correct":3,"explanation":"R-22 is a high-pressure refrigerant. Its saturation pressure is above atmospheric at typical operating temperatures. R-11, R-113, and R-123 are all low-pressure refrigerants used in centrifugal chillers, which are covered by Type III certification.","topic":"Refrigerants"},{"question":"For high-pressure appliances manufactured BEFORE November 15, 1993 containing less than 200 lbs of refrigerant, the required evacuation level is:","options":["4 inches of mercury (Hg) vacuum below atmospheric","10 inches of mercury (Hg) vacuum below atmospheric","0 psig (atmospheric pressure)","15 inches of mercury (Hg) vacuum below atmospheric"],"correct":2,"explanation":"For high-pressure equipment manufactured before November 15, 1993 with less than 200 lbs of refrigerant, the system must be evacuated to 0 psig (atmospheric pressure) before opening. This is less stringent than post-1993 equipment requirements.","topic":"Evacuation Requirements"},{"question":"For high-pressure appliances manufactured AFTER November 15, 1993 containing less than 200 lbs of refrigerant, the required evacuation level is:","options":["4 inches of mercury (Hg) vacuum","10 inches of mercury (Hg) vacuum","0 psig (atmospheric pressure)","15 inches of mercury (Hg) vacuum"],"correct":2,"explanation":"For high-pressure equipment manufactured after November 15, 1993 with less than 200 lbs of refrigerant, the required evacuation level is 0 psig (atmospheric pressure). Both pre- and post-1993 small systems require evacuation to 0 psig, but large systems (200+ lbs) have different requirements based on manufacture date.","topic":"Evacuation Requirements"},{"question":"For high-pressure appliances manufactured AFTER November 15, 1993 containing 200 lbs or MORE of refrigerant, the required evacuation level is:","options":["4 inches of mercury (Hg) vacuum","10 inches of mercury (Hg) vacuum","0 psig (atmospheric pressure)","25 mm Hg absolute pressure"],"correct":1,"explanation":"For high-pressure equipment manufactured after November 15, 1993 containing 200 lbs or more of refrigerant, the required evacuation level is 10 inches of mercury (Hg) vacuum. This is more stringent than the 4 inches Hg required for pre-1993 large systems.","topic":"Evacuation Requirements"},{"question":"R-410A cylinder pressure at typical room temperature (approximately 75 degrees F) is approximately:","options":["30 to 50 psig - slightly above atmospheric pressure","70 to 90 psig - similar to R-22 pressure","170 to 190 psig - moderately elevated pressure","210 to 230 psig - very high pressure"],"correct":3,"explanation":"R-410A has very high operating pressures. At room temperature (75F), cylinder pressure is approximately 210-230 psig. This is roughly 50-70% higher than R-22 at the same temperature. Always use manifold gauges and hoses specifically rated for R-410A pressures (minimum 800 psig working pressure).","topic":"R-410A"},{"question":"When charging R-410A into a system, the technician should:","options":["Always charge R-410A as vapor only to prevent liquid slugging","Charge R-410A as liquid from an inverted cylinder to maintain proper blend ratio","Mix R-410A with mineral oil before charging to improve lubricity","Always charge very slowly regardless of method to prevent fractionation"],"correct":1,"explanation":"R-410A is a near-azeotropic blend of R-32 and R-125. It MUST be charged as liquid (cylinder inverted) to maintain the proper refrigerant blend composition. Charging as vapor causes fractionation where the components separate, altering the refrigerant composition and degrading system performance.","topic":"R-410A"},{"question":"The annual leak rate that requires mandatory repair for comfort cooling systems with 50+ lbs of refrigerant is:","options":["10% of the total refrigerant charge per year","20% of the total refrigerant charge per year","30% of the total refrigerant charge per year","35% of the total refrigerant charge per year"],"correct":2,"explanation":"EPA regulations require owners of comfort cooling systems with 50 or more pounds of refrigerant to repair leaks when the annual leak rate exceeds 30% of the system's charge. The 30% threshold also applies to commercial refrigeration and industrial process refrigeration.","topic":"Leak Regulations"},{"question":"When a leak exceeding the threshold is discovered in a high-pressure system, the owner must repair it within:","options":["24 hours of discovery - immediate emergency repair required","30 days (or 120 days with an approved retrofit or retirement plan)","60 days for residential systems, 90 days for commercial systems","One year from the date the leak was first documented"],"correct":1,"explanation":"Once a leak exceeding the annual threshold is discovered, the owner has 30 days to complete repairs. An extension to 120 days is available if the owner submits an approved plan to either retrofit the system to a new refrigerant or retire and replace the equipment.","topic":"Leak Regulations"},{"question":"Which of the following is NOT a high-pressure refrigerant covered under Type II certification?","options":["R-22 (HCFC-22) used in residential air conditioning","R-134a (HFC) used in commercial refrigeration","R-123 (HCFC-123) used in centrifugal chillers","R-404A (HFC blend) used in commercial refrigeration"],"correct":2,"explanation":"R-123 is a low-pressure refrigerant with a saturation pressure below atmospheric at typical operating temperatures. It is used in centrifugal chillers and is covered under Type III certification. R-22, R-134a, and R-404A are all high-pressure refrigerants covered under Type II.","topic":"Refrigerants"},{"question":"What is the primary reason self-contained (active) recovery equipment must be used for Type II systems rather than system-dependent recovery?","options":["System-dependent recovery produces too much moisture contamination","Type II systems are too large and complex for system-dependent equipment","System-dependent recovery is only permitted for small appliances (Type I)","EPA specifically prohibits passive recovery on systems over 5 tons capacity"],"correct":2,"explanation":"System-dependent (passive) recovery is only permitted for small appliances (Type I - hermetically sealed systems with 5 lbs or less). All Type II and Type III equipment requires self-contained (active) recovery equipment with its own compressor.","topic":"Recovery"},{"question":"Which oil type is required for R-410A refrigeration systems?","options":["Mineral oil - the same as used in R-22 systems","Alkylbenzene oil - a semi-synthetic lubricant","POE (polyolester) oil specifically formulated for HFC refrigerants","Any HVAC-grade lubricating oil rated for the operating temperature range"],"correct":2,"explanation":"R-410A systems require POE (polyolester) oil. POE oil is highly miscible with HFC refrigerants and provides proper lubrication at R-410A's higher operating pressures. Mineral oil is incompatible with R-410A and will not circulate properly in the system.","topic":"Service Procedures"},{"question":"R-407C is commonly used as a retrofit refrigerant for R-22 systems because:","options":["It can be mixed directly with the existing R-22 charge","Its pressure-temperature relationship and capacity are similar to R-22","It requires no equipment modifications or oil changes","It has a lower GWP than all other HFC refrigerants"],"correct":1,"explanation":"R-407C has pressure-temperature characteristics and cooling capacity similar to R-22, making it a common retrofit choice. However, unlike some other R-22 alternatives, R-407C typically requires a POE oil flush and may require TXV adjustment. All existing R-22 must be completely recovered before retrofitting.","topic":"Refrigerants"},{"question":"When non-condensable gases (such as air) enter a high-pressure refrigerant system, what is the primary result?","options":["System pressure decreases causing the compressor to work harder","Discharge pressure increases, reducing efficiency and potentially damaging the compressor","The refrigerant becomes chemically contaminated and must be replaced","Suction pressure increases causing the system to short cycle"],"correct":1,"explanation":"Non-condensable gases (primarily air) do not condense at the system's condensing temperature and pressure. They accumulate in the condenser, causing elevated discharge pressure (high head pressure). This reduces system efficiency, increases compressor work, and can eventually lead to compressor damage.","topic":"Diagnosis"},{"question":"R-404A is commonly used in which application?","options":["Residential central air conditioning as an R-22 replacement","Commercial and transport refrigeration at medium to low temperatures","Centrifugal chiller applications as an R-11 replacement","Automotive air conditioning as an R-12 replacement"],"correct":1,"explanation":"R-404A is primarily used in commercial refrigeration (display cases, walk-in coolers) and transport refrigeration. It is a high-pressure HFC blend with excellent properties for medium and low-temperature applications. Its very high GWP of 3,922 is driving its replacement with lower-GWP alternatives.","topic":"Refrigerants"},{"question":"Before opening a high-pressure system that has been recovered to the required level, a technician should verify:","options":["The system pressure remains stable at or below the required evacuation level","The ambient temperature is above 60 degrees F for safe recovery","The recovery cylinder is certified by UL or AHRI","The customer has filed the required EPA notification for the service work"],"correct":0,"explanation":"After recovery and before opening the system, the technician must verify that system pressure remains stable at or below the required evacuation level. If pressure rises after the recovery machine cycles off, more refrigerant vapor remains in the system and recovery must continue.","topic":"Recovery"},{"question":"What tool must be used to verify the purity of refrigerant from an unknown source before adding it to a system?","options":["A standard manifold gauge set to check pressure-temperature relationship","A refrigerant identifier (analyzer) to verify purity and composition","A leak detector calibrated for the suspected refrigerant type","A moisture indicator to check for water contamination only"],"correct":1,"explanation":"A refrigerant identifier (analyzer) should be used to verify the purity and composition of refrigerant from unknown sources. Contaminated or mixed refrigerant must be recovered and sent to a reclaimer -- it cannot be used in a system. Using contaminated refrigerant can cause system damage and violates EPA regulations.","topic":"Service Procedures"},{"question":"R-32 is being adopted as a replacement for R-410A in some new equipment because:","options":["R-32 has a higher GWP than R-410A, making it better for cooling performance","R-32 has a GWP of approximately 675 - significantly lower than R-410A's 2,088","R-32 operates at lower pressures than R-410A, requiring less expensive equipment","R-32 is completely non-flammable and requires no special safety precautions"],"correct":1,"explanation":"R-32 (difluoromethane) has a GWP of approximately 675, compared to R-410A's GWP of 2,088 - a 68% reduction. R-32 also has good energy efficiency. Its main drawback is that it is classified as A2L (mildly flammable), requiring special handling procedures and A2L-rated equipment.","topic":"Refrigerants"},{"question":"What causes 'high head pressure' in a high-pressure refrigeration system?","options":["Low refrigerant charge causing excessive superheating","Dirty condenser, restricted airflow, overcharge, or non-condensables in the system","Failed expansion valve allowing liquid refrigerant to flood the compressor","Low ambient temperature reducing the condenser's ability to reject heat"],"correct":1,"explanation":"High head pressure (high discharge pressure) is typically caused by: dirty or blocked condenser coils, restricted airflow over the condenser, refrigerant overcharge, or non-condensable gases in the system. All of these impair the condenser's ability to reject heat.","topic":"Diagnosis"},{"question":"When installing a replacement filter-drier in an R-410A system, the technician should:","options":["Use any standard filter-drier rated for 400 psig or higher working pressure","Use a filter-drier specifically rated for R-410A with XH-7 or equivalent desiccant","Install two filter-driers in parallel to increase desiccant capacity","Use the same filter-drier type specified for R-22 since they are interchangeable"],"correct":1,"explanation":"Filter-driers for R-410A must use the appropriate desiccant type (typically XH-7 molecular sieve or equivalent). Standard desiccants used in R-22 driers can be incompatible with R-410A and POE oil. Always install a drier specifically rated and labeled for the refrigerant being used.","topic":"Service Procedures"},{"question":"Service records for high-pressure systems containing 50+ pounds must be maintained on-site and available for EPA inspection for at least:","options":["1 year from the date of the most recent service","3 years from the date of each service entry","5 years from the date of equipment installation","10 years or until equipment retirement, whichever comes first"],"correct":1,"explanation":"Service records must be maintained for at least 3 years from the date of each service entry. Records must include the date of service, refrigerant type and amounts added and recovered, and the name and EPA certification number of the technician who performed the work.","topic":"Regulations"},{"question":"After completing a retrofit of an R-22 system to a new refrigerant, the technician must:","options":["Submit the retrofit details to the EPA within 30 days","Update the system label to indicate the new refrigerant type, amount, and conversion date","Notify the equipment manufacturer of the refrigerant change","File documentation with the local building department"],"correct":1,"explanation":"After completing a refrigerant retrofit, the technician must update the system label to clearly indicate the new refrigerant type, the new refrigerant charge amount, and the date the conversion was performed. This information is essential for future service technicians who work on the equipment.","topic":"Service Procedures"},{"question":"Air that has infiltrated a high-pressure refrigerant system is sometimes called:","options":["Refrigerant contamination requiring immediate system evacuation","A non-condensable gas that elevates head pressure","A condensable gas that increases system capacity","A system refrigerant impurity that reduces oil viscosity"],"correct":1,"explanation":"Air is classified as a non-condensable gas because it does not condense at the system's normal condensing temperature and pressure. Non-condensables accumulate in the condenser and cause elevated discharge (head) pressure, reduced system efficiency, and potential compressor damage over time.","topic":"Diagnosis"},{"question":"When must ALL refrigerant be removed from a high-pressure system before work begins?","options":["Only before replacing the compressor or other major components","Any time the system will be opened to the atmosphere for any reason","Only if the system charge exceeds 50 pounds of refrigerant","Only when the system is being permanently retired or scrapped"],"correct":1,"explanation":"Refrigerant must be recovered to the required evacuation level any time a refrigerant circuit will be opened to the atmosphere -- this includes all repairs, component replacements, and system modifications. The only exception is when all refrigerant has already escaped from a catastrophic failure.","topic":"Regulations"},{"question":"R-454B is being introduced as a replacement for R-410A in new residential and commercial HVAC equipment primarily because:","options":["R-454B has higher cooling capacity than R-410A for the same equipment size","R-454B has a much lower GWP (466) compared to R-410A (2,088) and complies with AIM Act requirements","R-454B operates at significantly lower pressures than R-410A reducing equipment costs","R-454B is completely non-flammable unlike R-410A which is mildly flammable"],"correct":1,"explanation":"R-454B (also known as Opteon XL41) has a GWP of approximately 466 - a 78% reduction from R-410A's GWP of 2,088. This makes it compliant with EPA AIM Act requirements. R-454B is classified as A2L (mildly flammable), similar to R-32. New residential and commercial HVAC equipment is transitioning to R-454B beginning in 2025.","topic":"Refrigerants"}]}