Historical
ANSI Z21.20-2005
Automatic Gas Ignition Systems and Components
This standard applies to newly produced automatic gas ignition systems (see Part IV, Definitions) and components constructed entirely of new, unused parts and materials. An automatic gas ignition system shall perform the following functions: a. Ignite the gas at the main burner(s), or at the pilot burner(s) so it can ignite the main burner(s); b. Prove the presence of either the ignition source, the main burner flame, or both; and c. Automatically act to shut off the gas supply to the main burner(s), or to the pilot and the main burner(s), when the supervised flame or ignition source is not proved. Components submitted for examination under this standard shall perform one or more of the above functions.
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