EPA 608 Type III Study Guide

Type III focuses on low-pressure appliances, especially chillers. Questions often cover evacuation, leak testing, purge units, water contamination, and recovery procedures.

Key Topics

• Low-pressure chiller operation and service precautions.
• Air and moisture contamination, purge units, and non-condensables.
• Leak testing with pressurization and safe pressure limits.
• Recovery and evacuation procedures for low-pressure appliances.
• Charging, tube leaks, rupture discs, and system dehydration.

Practice Strategy

Watch for questions about pressure, vacuum, and water freezing. Type III questions can feel different from Type II because low-pressure systems behave differently during service.

What Makes Type III Different

Type III focuses on low-pressure systems, so the service risks are different from high-pressure equipment. Air and moisture contamination, purge unit operation, and freezing during evacuation are common themes.

Study Checklist

• Review low-pressure appliance recovery and evacuation concepts.
• Understand why moisture and air contamination are serious in chillers.
• Practice leak testing questions that mention pressurization and safe limits.
• Know the role of purge units and why non-condensables reduce performance.

Not affiliated with the EPA. For study practice only.