Refrigerated Warehouse Condensers: Design Condensing Temperature and Efficiency (Energy Code 120.6(a))
"Refrigerated Warehouse Condensers: Design Condensing Temperature and Efficiency (Energy Code 120.6(a))" is lesson 6 of 8 in the Refrigeration (C-38) Learning Hub. It opens with "When Section 120.6(a) Applies, and the Insulation Table" and works through 5 short steps, then a worked example you can check yourself against.
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Steps in this lesson
When Section 120.6(a) Applies, and the Insulation Table
Air-Cooled Condensers: Design Condensing Temperature
Evaporative and Water-Cooled Condensers
Condenser Efficiency: Table 120.6-B
Other Condenser and Compressor Controls
The worked example in the course applies this lesson to a realistic job in 6 steps, from "Insulation" through "Maximum input power for the air-cooled ammonia condenser".
What you'll be able to do
Explain the main idea of "Refrigerated Warehouse Condensers: Design Condensing Temperature and Efficiency (Energy Code 120.6(a))" in plain language you can use on the exam.
Apply this step with confidence: "Evaporative and Water-Cooled Condensers".
Apply this step with confidence: "Condenser Efficiency: Table 120.6-B".
Apply this step with confidence: "Other Condenser and Compressor Controls".
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: When Section 120.6(a) Applies, and the Insulation Table
2025 Energy Code Section 120.6(a) applies to refrigerated warehouses of 3,000 square feet or more, and to refrigerated spaces totaling 3,000 square feet or more on the same refrigeration system. Smaller refrigerated spaces follow the walk-in cooler and freezer rules of the Appliance Efficiency Regulations (Title 20, Sections 1601 through 1608). Exterior surfaces must meet Table 120.6-A-1: freezers roof/ceiling R-40, wall R-36, floor R-35 (R-20 if all underslab heating comes from productive refrigeration capacity); coolers roof/ceiling R-28 and wall R-28.
Step 2: Air-Cooled Condensers: Design Condensing Temperature
For new fan-powered condensers on new systems, Section 120.6(a)4B limits the design saturated condensing temperature (SCT) of air-cooled condensers to the design drybulb temperature plus 10 degrees F for systems serving freezers, or plus 15 degrees F for systems serving coolers. For adiabatic condensers, Section 120.6(a)4C uses dry-mode performance: design drybulb plus 20 degrees F for freezers and plus 30 degrees F for coolers.
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.
