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When recharging a low-pressure chiller, EPA says to introduce what first to prevent freezing water in the tubes?

Vapor before liquid.

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  1. Liquid
  2. Vapor ✔
  3. Nitrogen

Why: EPA's Type III recharging topics say to introduce vapor before liquid, to prevent freezing of water in the tubes. Add vapor first, then switch to liquid.

Huh, didn't know that: EPA's Type III topics also cover the purpose of the purge unit in low-pressure systems.

The dad joke
Why add vapor first? The tubes like to warm up before the big moment.
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References

Answer: Vapor. EPA's Type III recharging topics say to introduce vapor before liquid, to prevent freezing of water in the tubes. Add vapor first, then switch to liquid.

  1. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics
    Need to introduce vapor before liquid to prevent freezing of water in the tubes
    Checked 2026-10-10.
  2. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics
    Need to charge centrifugals through evaporator charging valve
    Checked 2026-10-10.
  3. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics
    Purpose of purge unit in low-pressure systems
    Checked 2026-10-10.

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