EPA 608 Plan

EPA 608 practice question: Type III — low-pressure appliances

Type III — low-pressure appliancesDifficulty 3/5

What evacuation level does Table 1 require for a low-pressure appliance?

  1. ATwenty-five inches of mercury vacuum, whatever the age of the recovery equipment
  2. BTen inches of mercury vacuum, if the recovery equipment was made after 1993
  3. CFifteen inches of mercury vacuum, if the charge is two hundred pounds or more
  4. DTwenty-five millimetres of mercury absolute, whatever the age of the equipment
Show answer and rationale

Correct: D. The low-pressure row is the only one in Table 1 expressed as an absolute pressure rather than a vacuum, and the only one that does not change with the age of the recovery equipment.

  • A — The figure is twenty-five millimetres of mercury absolute, not twenty-five inches of vacuum.
  • B — Ten inches applies to high-pressure appliances of two hundred pounds or more.
  • C — Fifteen inches applies to medium-pressure appliances of two hundred pounds or more.

Concept being tested

25 items. Low-pressure centrifugal chillers behave differently from everything else: recovery to 25 mm Hg absolute, pressurising with controlled hot water rather than nitrogen, purge units and what excessive purging indicates, heating oil before removal, circulating water through the chiller during evacuation to stop it freezing, recharging vapour before liquid, and the R-123 refrigerant sensor requirement. — 25% of the exam. Study guide for Type III — low-pressure appliances.

Related questions

Practice this topic

Blueprint-mapped questions with full rationales for every choice.

Start practice

Primary references

  1. 40 CFR Part 82 Subpart F — Recycling and Emissions Reduction — Office of the Federal Register (eCFR) · government · retrieved 2026-09-22, verified 2026-09-22
Last reviewed: 2026-10-07Reviewed by: David Miller, CM, EPA Universal, HVAC/R master technician & refrigerant compliance reviewHow we verify facts