Medium-pressure appliance under 200 lb, recovery equipment made after November 15, 1993. Evacuate to how many inches of mercury vacuum?

References

Answer: 10 inches. Medium-pressure appliances, such as R-134a systems, with a full charge under 200 pounds must reach 10 inches of mercury vacuum with newer recovery equipment. Older equipment, made before November 15, 1993, only has to reach 4 inches.

1. 40 CFR 82.156 Required practices (Cornell LII) www.law.cornell.edu/cfr/text/40/82.156

   Medium-pressure appliance , or isolated component of such appliance , with a full charge of less than 200 pounds of refrigerant 4 10.

   Checked 2026-10-10.
2. 40 CFR 82.152 Definitions (Cornell LII) www.law.cornell.edu/cfr/text/40/82.152

   liquid phase saturation pressure between 45 psia and 170 psia at 104 °F

   Checked 2026-10-10.
3. 40 CFR 82.152 Definitions (Cornell LII) www.law.cornell.edu/cfr/text/40/82.152

   R-114, R-124, R-12, R-134a, and R-500

   Checked 2026-10-10.
4. 40 CFR 82.161 Technician certification (Cornell LII) www.law.cornell.edu/cfr/text/40/82.161

   must be certified as Type II technicians

   Checked 2026-10-10.

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