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Opening a high-pressure appliance with under 200 lb, using post-1993 equipment. Evacuate to how many inches of mercury vacuum?

0 inches of mercury vacuum.

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  1. 0 inches (atmospheric pressure) ✔
  2. 10 inches
  3. 15 inches

Why: For high-pressure appliances with a full charge under 200 pounds, post-1993 recovery equipment must reach 0 inches of mercury vacuum, which is atmospheric pressure. Very high-pressure appliances are also 0.

Huh, didn't know that: Larger high-pressure appliances of 200 pounds or more need 10 inches of mercury vacuum with newer equipment.

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References

Answer: 0 inches (atmospheric pressure). For high-pressure appliances with a full charge under 200 pounds, post-1993 recovery equipment must reach 0 inches of mercury vacuum, which is atmospheric pressure. Very high-pressure appliances are also 0.

  1. 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
    High-pressure appliance, or isolated component of such appliance, with a full charge of less than 200 pounds of refrigerant 0 0.
    Checked 2026-10-10.
  2. 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156
    Very high-pressure appliance 0 0.
    Checked 2026-10-10.

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Trades & ShopHigh-pressure appliance with 200 lb or more, post-1993 recovery equipment. Evacuate to how many inches of mercury vacuum?Trades & ShopInstead of recovering a percentage, a technician can evacuate a small appliance to what vacuum?Trades & ShopMedium-pressure appliance under 200 lb, recovery equipment made after November 15, 1993. Evacuate to how many inches of mercury vacuum?

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