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

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  1. Liquid
  2. Vapor
  3. Nitrogen

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References

  1. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics Checked 2026-10-10.
  2. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics Checked 2026-10-10.
  3. EPA Section 608 Technician Certification Test Topics www.epa.gov/section608/test-topics Checked 2026-10-10.

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