ANSI Z21.20-2005 (R2016)

Preface
NATIONAL DIFFERENCES
FOREWORD
1 Scope and normative references
2 Definitions
3 General requirements
4 General notes on tests
5 Rating
6 Classification
7 Information
8 Protection against electric shock
9 Provision for protective earthing
10 Terminals and terminations
11 Constructional requirements
12 Moisture and dust resistance
13 Electric strength and insulation resistance
14 Heating
15 Manufacturing deviation and drift
16 Environmental stress
17 Endurance
18 Mechanical strength
19 Threaded parts and connections
20 Creepage distances, clearances and distances through
   solid insulation
21 Resistance to heat, fire and tracking
22 Resistance to corrosion
23 Electromagnetic compatibility (EMC) requirements -
   emission
24 Components
25 Normal operation
26 Electromagnetic compatibility (EMC) requirements -
   immunity
27 Abnormal operation
28 Guidance on the use of electronic disconnection
Annexes
Annex H (normative) - Requirements for electronic controls
Annex J (normative) - Requirements for controls using
        thermistors
Annex BB (informative) - Functional characteristics of
         burner control systems to be specified by the
         relevant appliance standards, as applicable
Annex DVKK (normative) - Requirements for Components
           of Burner Control Systems
Annex DVLL (normative) - Manufacturing and Production
           Testing
Annex DVMM (normative) - Requirements for Solid-State
           Oil Igniters

Pertains to automatic electrical burner control systems for the automatic control of burners for oil, gas, coal or other combustibles for household and similar use including heating, air conditioning and similar use.

Scope 1.1.1 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. 1.1.2 This Standard applies to automatic gas ignition systems which also serve as oxygen depletion safety shutoff (ODS) systems (see Part IV, Definitions). 1.1.3 This Standard covers automatic gas ignition systems and components intended primarily for use with gas appliances having inputs of 400,000 Btu/hr (117 228 W) or less per individual combustion chamber. 1.1.4 This Standard applies to automatic gas ignition systems and components for use with one or more of the following gases: a. Natural; b. Manufactured; c. Mixed; d. Liquefied petroleum; and e. LP gas-air mixtures. 1.1.5 Compliance of an automatic gas ignition system or component with this standard does not imply that such a system or component of such a system is acceptable for use on gas appliances without supplemental tests with the device(s) applied to the particular appliance design.