Understanding EPA 608 Type II Scope (EPA 608 Practice Test)
Type II certification covers high-pressure and medium-pressure systems — the most common appliances HVAC technicians encounter in the field. This includes residential central air conditioners, heat pumps, commercial refrigeration racks, and refrigerated warehouses. Any system using a refrigerant with a boiling point above -50°C at atmospheric pressure falls under Type II jurisdiction.
The Type II exam focuses on three high-value technical areas:
- Leak Repair Requirements — Systems with more than 50 pounds of refrigerant are subject to mandatory leak repair thresholds. The threshold varies by system category.
- Recovery Vacuum Standards — Evacuation depth requirements (in inches of mercury) differ based on refrigerant type and whether recovery equipment was manufactured before or after November 15, 1993.
- High-Pressure System Components — Receivers, accumulators, moisture-indicating sight glasses, oil separators, and relief valves are all testable entities.
Leak Repair Requirements for Systems Over 50 Pounds
Under Section 608, systems containing more than 50 pounds of refrigerant that leak above the annual threshold must be repaired within 30 days, or within 120 days with an approved retrofit or retirement plan. Leak rates are calculated as a percentage of the total system charge per year.
| System Category | Annual Leak Rate Threshold | Example Systems |
|---|---|---|
| Comfort Cooling | 10% | Central AC, chillers for buildings |
| Commercial Refrigeration | 20% | Grocery store racks, walk-in coolers |
| Industrial Process Refrigeration (IPR) | 30% | Food processing, chemical plants |
Recovery Vacuum Standards for High-Pressure Systems
Recovery depth requirements are measured in inches of mercury (in. Hg) vacuum. Equipment manufactured after November 15, 1993 must meet the higher post-1993 standard. For most HFC refrigerants (R-410A, R-32) in systems under 200 pounds, the recovery standard requires pulling to 0 psig. Systems over 200 pounds require a deeper vacuum pull to 4 in. Hg. The Type II exam tests these thresholds directly — memorize them alongside the leak rate table above.
After completing this practice test, take the Type I practice test or the EPA 608 Universal practice test to simulate the full 100-question exam. Review the EPA 608 cheat sheet for a consolidated table of all vacuum levels by refrigerant and system size.
Frequently Asked Questions
High-pressure and medium-pressure systems including residential central AC, heat pumps, and commercial refrigeration racks. Any refrigerant with a boiling point above -50°C at atmospheric pressure is classified as high or medium pressure.
10% annual leak rate for systems with more than 50 pounds of refrigerant. Systems exceeding this threshold must be repaired within 30 days.
Industrial Process Refrigeration. IPR systems have the highest permissible leak rate (30%) due to the complexity and continuous operation requirements of industrial processes.
Yes. Nitrogen trace gas is the accepted method for pressure-testing a system after repair and before recharging. Never use oxygen or air — they create combustion risk.
A shallow vacuum removes large amounts of non-condensables. A deep vacuum (typically 300–500 microns) removes moisture and confirms system integrity before recharging. Type II tests both procedures and their respective equipment requirements.