EPA 608 Type 2 Practice Test: High-Pressure Systems
Type II certification covers medium-, high-, and very-high-pressure appliances other than small appliances and vehicle AC systems, which in practice means most residential split systems and heat pumps. The section leans hardest on leak detection and leak-repair thresholds, since high-pressure systems are the equipment class where refrigerant loss is both common and closely regulated. We wrote the eight questions below directly against EPA’s published Type II test topics, with the answer and reasoning under each.
Type II is the most commonly needed certification for residential and light-commercial techs, since it’s the one that covers everyday split AC and heat pump service. It’s also where a lot of test-takers get tripped up on the leak-rate math, because the allowable percentage changes depending on the appliance category, and the exam expects you to know which threshold applies where.
What equipment falls under Type II?
Medium-, high-, and very high-pressure appliances, excluding small appliances (Type I) and motor vehicle air conditioners. In practice, that’s residential and light commercial split-system air conditioners, most heat pumps, and similar equipment operating well above atmospheric pressure on both the high and low side. Type II is the certification most residential HVAC/R techs actually need day to day.
Leak-rate thresholds (memorize this table)
| Appliance category | Allowable annual leak rate | What happens if exceeded |
|---|---|---|
| Commercial and industrial process refrigeration | Lower threshold, tightest allowance | Leak must be repaired within EPA’s required timeframe, with recordkeeping |
| Other appliances containing more than 50 lbs of refrigerant | Higher threshold than process refrigeration, but still capped | Same repair and recordkeeping requirement applies |
Source: EPA’s Test Topics page, Type II section, which lists the leak-repair requirement categories directly. Exact percentage thresholds are set in EPA’s leak-repair regulations and can be extended under specific circumstances, so always check the current rule rather than a memorized number from an old study guide.
8 original Type II practice questions
1. What is the correct order of preference for leak-test gases on a high-pressure system? Answer: Nitrogen alone is best; if a trace gas is needed to help detect the leak, a small trace quantity of HCFC-22 mixed with nitrogen is preferable to using the system’s own pure refrigerant as the test gas. Why: EPA’s Type II Leak Detection topics rank nitrogen highest specifically because it avoids releasing additional refrigerant into the atmosphere during a test that hasn’t found a leak yet.
2. A technician needs to recover refrigerant from a high-pressure appliance before a major repair. Does the required recovery level differ from a non-major repair on the same appliance? Answer: Yes. EPA’s evacuation requirements for high-pressure appliances are defined separately for major versus non-major repairs, with major repairs generally requiring a deeper recovery level. Why: A major repair opens the refrigerant circuit more extensively, so EPA’s Type II topics test whether you know the repair classification changes the recovery target, not just the appliance type.
3. What’s the fastest way to speed up refrigerant recovery from a high-pressure system, besides recovering liquid first? Answer: Chilling the recovery vessel, or heating the appliance or the vessel the refrigerant is being recovered from. Why: Both methods manipulate pressure differential to move refrigerant faster; EPA’s Type II Recovery Techniques topics list both as legitimate speed-up methods alongside recovering liquid at the start of the process.
4. Why should a technician wait a few minutes after reaching the required recovery vacuum before disconnecting equipment? Answer: To confirm the system pressure doesn’t rise again, which would indicate there’s still liquid refrigerant trapped in the system or dissolved in the oil. Why: This is a direct EPA Type II Recovery Requirements topic; disconnecting too early on a system with residual liquid refrigerant releases refrigerant that should have been recovered.
5. Are hydrocarbon refrigerants approved for retrofitting an existing high-pressure system originally designed for HFC or HCFC refrigerant? Answer: No, hydrocarbons are not approved for retrofits under EPA’s Type II Refrigeration topics. Why: Hydrocarbon refrigerants carry flammability characteristics that most existing high-pressure equipment wasn’t engineered to handle safely, which is why the exam tests this as a flat rule rather than a case-by-case judgment call.
6. Under ASHRAE Standard 15, what safety equipment is required in an equipment room housing high-pressure refrigeration equipment? Answer: An oxygen-deprivation sensor, required with all refrigerants under the standard, not just flammable or toxic ones. Why: EPA’s Type II Safety topics tie directly to ASHRAE Standard 15’s equipment-room requirements, since a refrigerant leak in an enclosed mechanical room can displace oxygen regardless of the refrigerant’s other properties.
7. What’s a sign of leakage in a high-pressure hermetic system that a technician should watch for besides an obvious hissing sound or oil trace? Answer: Excessive superheat, which points to a low refrigerant charge caused by a leak. Why: EPA’s Type II Leak Detection topics list excessive superheat as a diagnostic sign alongside visible oil traces at hermetic fittings, since not every leak announces itself audibly or visually.
8. Should a technician energize a hermetic compressor while it’s under a vacuum? Answer: No. Why: EPA’s Type II Safety topics flag this directly; energizing a compressor under vacuum can damage the motor windings and creates an arcing risk inside the sealed shell, since the vacuum removes the normal insulating gas environment the motor was designed to run in.
608Prep is not affiliated with the EPA or any certifying organization; we use “EPA 608” the way the trade does, to name the exam, not to claim we administer it.
Run the rest of 608Prep’s free Type II practice quiz to work through leak-rate math and recovery-level scenarios with explanations attached to every answer.
If pressure-temperature charts and leak-repair thresholds still feel like a foreign language, the 608Prep study guide breaks down Type II section by section before you sit the real exam.
FAQ
How many questions are on the real EPA 608 Type II exam? 25, drawn from EPA’s federal question bank for Type II topics, and it must be proctored; EPA doesn’t allow open-book testing for Type II.
What equipment is covered by Type II certification? Medium-, high-, and very-high-pressure appliances other than small appliances and motor vehicle AC systems, which covers most residential split AC systems and heat pumps.
Why does the leak-rate threshold matter on the exam? Because EPA sets different allowable annual leak rates for commercial/industrial process refrigeration versus other appliances over 50 pounds of charge, and test questions specifically probe whether you know which threshold applies to which appliance category.
Is Type II harder than Type I? Most technicians find it more involved, since it covers leak-rate math, major-versus-non-major repair distinctions, and ASHRAE Standard 15 safety rules on top of the recovery techniques Type I already tests.
Can Type II be taken open-book? No. EPA requires Type II, Type III, and Universal certification to be proctored; only Core and Type I can be offered open-book by some providers.
Bottom line: nail the leak-rate thresholds and the major-versus-non-major repair distinction first, since those two areas cause the most missed questions on the real Type II exam.