20 Type II — High-Pressure Practice Questions & Answers
Every Type II — High-Pressure practice question from the EPA 608 Certification Practice Test, with the correct answer and a short explanation.
Start practice test →1. Which of the following is classified as a high-pressure appliance under EPA Section 608, requiring Type II certification to service?
- A.A household refrigerator using R-134a
- B.A residential central air conditioner using R-410A✓ Answer
- C.A motor vehicle air conditioner
- D.A small window unit charged with less than 5 lb
Type II certification covers high-pressure appliances, which include residential and commercial air conditioning and heat pumps using refrigerants such as R-22 and R-410A. These operate at high pressures, unlike small appliances (Type I) or MVACs (Section 609).
Source: 40 CFR 82.161 (technician certification, Type II)Report a problem with this question
2. A high-pressure refrigerant such as R-410A operates at pressures notably higher than which older refrigerant it commonly replaces?
- A.R-11
- B.R-22✓ Answer
- C.R-500
- D.R-123
R-410A is a high-pressure blend that operates at roughly 50-70% higher pressures than R-22, which it commonly replaces in residential air conditioning. Equipment and recovery gear must be rated for these higher pressures.
Source: 40 CFR Part 82 Subpart F; refrigerant pressure classificationsReport a problem with this question
3. Which refrigerant is classified as very-high-pressure, placing it outside the Type II high-pressure category?
- A.R-13✓ Answer
- B.R-502
- C.R-410A
- D.R-22
R-13 (and R-503) are very-high-pressure refrigerants used in ultra-low-temperature systems. EPA distinguishes very-high-pressure appliances from high-pressure ones because their recovery evacuation requirements differ; R-22, R-410A, and R-502 are high-pressure.
Source: 40 CFR 82.156; appliance pressure classificationsReport a problem with this question
4. Why must the required evacuation level be reached before a high-pressure appliance is opened for service or disposal?
- A.To minimize the amount of refrigerant that would otherwise be released to the atmosphere✓ Answer
- B.To increase the system's operating efficiency after repair
- C.To pressurize the system for a leak test
- D.To warm the refrigerant so it recovers faster
The evacuation requirement exists to remove as much refrigerant as practical so that when the system is opened, minimal refrigerant remains to escape. This directly supports the Clean Air Act goal of preventing ozone-depleting and greenhouse refrigerant emissions.
Source: Clean Air Act §608; 40 CFR 82.156(a)Report a problem with this question
5. What are non-condensable gases in a refrigeration system, and why are they a problem?
- A.Gases such as air that do not condense; they raise head pressure and reduce efficiency✓ Answer
- B.Inert oils that improve lubrication under high load
- C.Water vapor only, which always freezes at the metering device
- D.Refrigerant vapor that condenses too quickly, flooding the compressor
Non-condensable gases—chiefly air—do not condense at the system's operating conditions. They collect in the condenser, raising head (discharge) pressure and operating temperature, which lowers efficiency and can damage the compressor.
Source: EPA Section 608 core knowledge; system contamination principlesReport a problem with this question
6. To reduce introducing non-condensable gases and moisture, what should a technician do before charging a high-pressure system that has been opened?
- A.Charge liquid refrigerant rapidly into the suction line
- B.Evacuate the system with a vacuum pump to remove air and moisture✓ Answer
- C.Add extra refrigerant to push the air out through the low side
- D.Leave the system open overnight to let moisture evaporate
Deep evacuation with a vacuum pump lowers system pressure enough to boil off moisture and pull out non-condensable air before charging. This prevents contamination that would raise pressures and form acids or ice at the metering device.
Source: EPA Section 608 servicing practices; system evacuationReport a problem with this question
7. What is the primary function of a filter drier in a high-pressure refrigeration system?
- A.To add oil to the refrigerant charge
- B.To raise the boiling point of the refrigerant
- C.To increase refrigerant flow rate to the evaporator
- D.To remove moisture and trap contaminants and particulates✓ Answer
A filter drier contains desiccant to adsorb moisture and a filter to trap particulates and contaminants. Removing moisture is critical because water in the system can form acids and ice, damaging components.
Source: EPA Section 608 servicing practices; component functionReport a problem with this question
8. When is 'system-dependent' (passive) recovery prohibited, requiring 'self-contained' (active) recovery equipment instead?
- A.Only when the refrigerant is R-134a
- B.Never; passive recovery is always allowed
- C.When the outdoor temperature is above 70°F
- D.When servicing appliances containing more than a small charge, such as most high-pressure systems✓ Answer
System-dependent (passive) recovery relies on the appliance's own compressor or pressure and is limited to small appliances. Larger high-pressure appliances must use self-contained (active) recovery equipment with its own compressor to reach required evacuation levels.
Source: 40 CFR 82.156; recovery equipment requirementsReport a problem with this question
9. A supermarket refrigeration rack system using R-404A would require which type of technician certification to service the refrigerant circuit?
- A.Type II (high-pressure appliances)✓ Answer
- B.Section 609 (motor vehicle A/C)
- C.Type I (small appliances)
- D.No certification is required for commercial racks
Supermarket rack systems are high-pressure commercial refrigeration and fall under Type II certification. Type I is only for small appliances with 5 pounds or less of refrigerant, which these systems far exceed.
Source: 40 CFR 82.161; Type II scopeReport a problem with this question
10. Which practice is required when a technician finds that a high-pressure appliance has a leak during service?
- A.Repair the leak rather than simply topping off the refrigerant charge✓ Answer
- B.Vent the remaining charge and replace it with air
- C.Add refrigerant regularly to keep the system running without repair
- D.Ignore small leaks because refrigerant is inexpensive
The regulations aim to reduce emissions by requiring leaks to be found and repaired rather than routinely recharging a leaking system. Repairing the leak prevents ongoing refrigerant loss to the atmosphere.
Source: 40 CFR 82.157 (leak repair requirements)Report a problem with this question
11. Which method is an acceptable way to detect leaks in a high-pressure refrigeration system?
- A.Feeling for cold spots with a bare hand only
- B.Listening for the compressor to change pitch
- C.An electronic leak detector or soap-bubble solution at joints✓ Answer
- D.Waiting to see if the system loses charge over several months
Electronic leak detectors, soap-bubble (leak-detection) solutions, and fluorescent dyes are standard, reliable leak-detection methods. They locate the leak so it can be repaired, unlike vague indirect indicators.
Source: EPA Section 608 leak detection practicesReport a problem with this question
12. Recovery equipment used to service high-pressure appliances must meet what basic requirement under the regulations?
- A.It must be certified/approved to meet EPA equipment standards✓ Answer
- B.It must never contain its own compressor
- C.It must be rated only for very-high-pressure refrigerants
- D.It only needs to be homemade from spare parts
Recovery and recycling equipment must be certified to meet EPA standards (equipment manufactured on or after the applicable date is tested and certified to reach required evacuation levels). This ensures it can achieve the mandated vacuum performance.
Source: 40 CFR 82.158 (recovery/recycling equipment standards)Report a problem with this question
13. Why is it important to avoid mixing different refrigerants (cross-contamination) when recovering from a high-pressure appliance?
- A.Mixed refrigerants cannot be reclaimed to purity standards and may be unusable✓ Answer
- B.Mixing always improves cooling capacity
- C.Mixed refrigerants are easier to recycle on site
- D.It has no effect on the recovered refrigerant's value
Cross-contaminated (mixed) refrigerant generally cannot be reclaimed to the required purity standard, so it may have to be destroyed rather than reused. Keeping recovery cylinders dedicated to a single refrigerant preserves reclaim value.
Source: EPA Section 608; reclamation to AHRI-700 purity standardReport a problem with this question
14. What is the difference between recovering, recycling, and reclaiming refrigerant?
- A.Reclaim means venting to the atmosphere legally
- B.They are three words for the exact same process
- C.Recover = remove and store; recycle = clean for reuse on site; reclaim = process to purity standard✓ Answer
- D.Recycle means destroying the refrigerant permanently
Recovery removes refrigerant and stores it; recycling cleans it (oil separation, single-pass filtering) for reuse on the same or owner's equipment; reclamation reprocesses it to meet the AHRI-700 purity standard so it can be resold. The distinction matters for legal reuse.
Source: 40 CFR 82.152 (definitions: recover, recycle, reclaim)Report a problem with this question
15. A refrigerant recovery cylinder should never be filled beyond what limit for safety?
- A.80% of its capacity to allow for liquid expansion✓ Answer
- B.100% completely full of liquid
- C.95% to leave a small vapor space
- D.50% by weight of water
Recovery cylinders must not be filled beyond 80% of capacity (by the '80% fill' rule) so that liquid refrigerant has room to expand as temperature rises. Overfilling risks hydrostatic rupture of the cylinder—a serious safety hazard.
Source: DOT/EPA cylinder safety; 80% fill rule for recovery cylindersReport a problem with this question
16. When charging a high-pressure system, why should a technician generally add liquid refrigerant to the high side (or as controlled vapor to the low side) rather than dumping liquid into the suction line while running?
- A.Liquid entering the running compressor's suction can cause slugging and compressor damage✓ Answer
- B.Vapor charging removes moisture from the system
- C.Liquid charging is illegal under all circumstances
- D.The high side cannot accept refrigerant
Compressors are designed to pump vapor, not liquid. Liquid refrigerant drawn into the suction of a running compressor cannot compress and causes slugging, which can mechanically damage valves and pistons. Liquid is added to the high side with the compressor off, or metered carefully.
Source: EPA Section 608 safe charging practices; compressor protectionReport a problem with this question
17. Under Section 608, refrigerant may be added to top off a high-pressure system only after which condition is met?
- A.The refrigerant price has dropped
- B.The owner verbally requests more cooling
- C.Substantial leaks have been repaired as required by the leak-repair rules✓ Answer
- D.The system has run for at least 24 hours
The rules discourage chronic recharging of leaking equipment: for appliances that exceed the leak-repair thresholds, substantial leaks must be repaired rather than simply topping off. This forces leak repair instead of ongoing emissions.
Source: 40 CFR 82.157 (leak repair requirements)Report a problem with this question
18. Why is moisture (water) especially harmful in a high-pressure refrigeration system?
- A.It is harmless as long as the filter drier is removed
- B.It raises the refrigerant's cooling capacity
- C.It improves lubrication of the compressor
- D.It can form acids and freeze at the metering device, causing corrosion and blockages✓ Answer
Water reacts with refrigerant and oil to form acids that corrode metal components, and it can freeze at the expansion device/metering point, blocking refrigerant flow. This is why evacuation and filter driers are used to keep systems dry.
Source: EPA Section 608; moisture contamination effectsReport a problem with this question
19. After reaching the required evacuation vacuum during recovery, why should a technician isolate the system and watch whether pressure rises back up before proceeding?
- A.A pressure rebound indicates remaining refrigerant boiling off or a leak, meaning recovery is incomplete✓ Answer
- B.It confirms the vacuum pump is broken
- C.Pressure always rises and can be ignored
- D.Rising pressure proves the charge is fully recovered
After hitting the target vacuum, the regulations require the equipment to be capable of holding it; a rebound in pressure after isolation means trapped or absorbed refrigerant is still boiling out (or air is leaking in), so recovery must continue until the vacuum holds.
Source: 40 CFR 82.156(a); evacuation must be achieved and heldReport a problem with this question
20. Which statement best describes the distinction between high-pressure and very-high-pressure appliances for recovery purposes?
- A.They are separate categories with their own required evacuation levels and refrigerant lists✓ Answer
- B.They are identical and use the same evacuation table
- C.Very-high-pressure appliances require no recovery at all
- D.High-pressure appliances are always small appliances
EPA's evacuation appendix lists high-pressure and very-high-pressure appliances as distinct categories, each with its own required evacuation levels. Very-high-pressure refrigerants (e.g., R-13, R-503) are handled separately from high-pressure ones (e.g., R-22, R-410A, R-502).
Source: 40 CFR Part 82 Subpart F, Appendix (required evacuation levels by category)Report a problem with this question
Practice questions modeled on the EPA Section 608 Technician Certification content (Clean Air Act §608; 40 CFR Part 82). Not affiliated with or endorsed by the U.S. Environmental Protection Agency or any approved certifying organization. Study the official EPA program materials before testing. Official EPA 608 →