Supermarket Leak-Tight Installation: CALGreen 5.508.2 Pressure Test and Evacuation
"Supermarket Leak-Tight Installation: CALGreen 5.508.2 Pressure Test and Evacuation" is lesson 5 of 8 in the Refrigeration (C-38) Learning Hub. It opens with "Who Section 5.508.2 Covers" and works through 5 short steps, then a worked example you can check yourself against.
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Steps in this lesson
Who Section 5.508.2 Covers
Piping Rules That Reduce Leaks
Valves, Relief Devices and Receivers
The 300 psig Standing Pressure Test
The Three-Stage Evacuation
The worked example in the course applies this lesson to a realistic job in 6 steps, from "First pressure test" through "Minimum timed holds".
What you'll be able to do
Explain the main idea of "Supermarket Leak-Tight Installation: CALGreen 5.508.2 Pressure Test and Evacuation" in plain language you can use on the exam.
Apply this step with confidence: "Valves, Relief Devices and Receivers".
Apply this step with confidence: "The 300 psig Standing Pressure Test".
Apply this step with confidence: "The Three-Stage Evacuation".
Test yourself on the worked example and the quick-check quiz inside the classroom.
The diagram for this lesson, exactly as it appears in the Learning Hub.
The first steps of this lesson
Step 1: Who Section 5.508.2 Covers
2025 CALGreen Section 5.508.2 applies to new commercial refrigeration systems in retail food stores of 8,000 square feet or more of conditioned area that use refrigerated display cases or walk-in coolers or freezers connected to remote compressor units or condensing units. New includes both new facilities and replacement of existing systems. It applies to high-GWP refrigerants, those with a GWP of 150 or greater. Low-GWP refrigerants under 150, such as ammonia and carbon dioxide, are the stated exception. Section 5.508.1 separately bars HVAC, refrigeration and fire suppression equipment containing CFCs or halons.
Step 2: Piping Rules That Reduce Leaks
Piping must comply with the California Mechanical Code and be accessible for leak protection and repair (Section 5.508.2.1). Threaded pipe, copper tubing under 1/4 inch OD, flared connections and short-radius elbows are not used, with these exceptions: threaded connections at the compressor rack; tubing under 1/4 inch OD in systems of 5 pounds of refrigerant or less, clamped to a rigid base to keep vibration below 8 mils; double-flared connections for pressure controls, valve pilot lines and oil; and short-radius elbows only where space prohibits long-radius elbows.
The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.
Independent exam preparation. Contractors Classroom is not affiliated with the Contractors State License Board, and no course can guarantee a passing result.
