Boiler Group and Required Controls (CMC Table 1003.2.1)
"Boiler Group and Required Controls (CMC Table 1003.2.1)" is lesson 2 of 7 in the Boiler and Steam Fitting (C-4) Learning Hub. It opens with "Automatic Boilers Are Sorted Into Groups" and works through 5 short steps, then a worked example you can check yourself against.
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Steps in this lesson
Automatic Boilers Are Sorted Into Groups
Find the Group From the Input Range
What the Bigger Groups Add
Limit Controls and Gauges for Every Automatic Boiler
Large Gas and Oil Burners, and Your Handoff Duties
The worked example in the course applies this lesson to a realistic job in 6 steps, from "Fuel input of the gas boiler" through "Limit controls for both".
What you'll be able to do
Explain the main idea of "Boiler Group and Required Controls (CMC Table 1003.2.1)" in plain language you can use on the exam.
Apply this step with confidence: "What the Bigger Groups Add".
Apply this step with confidence: "Limit Controls and Gauges for Every Automatic Boiler".
Apply this step with confidence: "Large Gas and Oil Burners, and Your Handoff Duties".
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: Automatic Boilers Are Sorted Into Groups
2025 CMC §1003.2.1 says automatic boilers shall have controls and limit devices in accordance with ASME CSD-1 or Table 1003.2.1. The table sorts boilers into groups by fuel and by fuel input range (inclusive): gas Groups A to D, oil Groups E to H, electric Group K, and Group L for gas, oil or coal boilers of 12,500,000 Btu/h or more (per NFPA 85). The controls, safety-control timing and limit devices you must provide depend on the group, and all controls must carry the approval of an approved testing agency or be accepted by the Authority Having Jurisdiction (§1003.2).
Step 2: Find the Group From the Input Range
Gas: Group A is 0 to 400,000 Btu/h, B is 400,001 to 2,500,000, C is 2,500,001 to 5,000,000 and D is over 5,000,000. Oil: Group E is 0 to 400,000, F is 400,001 to 1,000,000, G is 1,000,001 to 3,000,000 and H is over 3,000,000. Footnote 1 says the fuel input is determined by one of two methods: the burner input, which shall not exceed the burner nameplate or the manufacturer-identified input, or the nominal boiler rating as determined by the building official plus 25 percent. The 25 percent can push a boiler up into the next group.
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.
