CSA/AM - ANSI Z21.20-1993
Automatic Gas Ignition Systems and Components; Eleventh Edition
|Publication Date:||1 January 1993|
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.
This standard applies to automatic gas ignition systems which also serve as oxygen depletion safety shutoff (ODs) systems (see Part IV, Definitions).
This standard covers automatic gas ignition systems and components intended primarily for use with gs appliances having inputs of 400,000 Btu per hour (117 228 W) or less per individual combustion chamber.
This standard applies to automatic gas ignition systems and components for use with one or more of the following gases.
The above terms are defined in Part IV, Definitions.
If a value for measurement as given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.
All references to psi throughout this standard are to be considered gage pressures unless otherwise specified.
Exhibit A (List of Reference Standards) contains a list of standards specifically referenced in this standard and sources from which they may be obtained