Which of the following is a low-pressure refrigerant used in centrifugal chillers?
Explanation
HCFC-123 is a classic low-pressure chiller refrigerant, along with CFC-11 and the newer R-1233zd. 40 CFR §82.152 defines a low-pressure appliance as one whose refrigerant has a liquid-phase saturation pressure below 45 psia at 104°F, which is why these machines run in a vacuum on the low side. R-22, R-404A and R-410A are high-pressure refrigerants (170–355 psia at 104°F) and fall under Type II.
Law Reference: 40 CFR §82.152This topic, taught in full in the EPA Section 608 Certification guide. EPA 608 Universal Study Guide (2026) — Core + Type I/II/III, with the 2027 A2L update — PDF + EPUB, $14.99 · 14-day refund →
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