Historical
ANSI Z21.78-2005/CSA 6.20-2005
Combination Gas Controls for Gas Appliances
This standard applies to newly produced combination gas controls (see Definitions, Part IV), hereinafter referred to as controls, constructed entirely of new, unused parts and materials. The combination control may include other functions such as pilot gas filters, pressure switches, etc., which shall be of an approved type (see Definitions, Part IV), or shall be investigated as an integral part of the combination control for construction and performance equivalent to an approved type. A control which incorporates two or more automatic valves and no other function, (as defined by combination control, see Definitions, Part IV), may be tested to th is Standard or Automatic Valves for Gas Appliances, Z21.21 / CSA 6.5, at the discretion of the manufacturer.
CSA America, Inc. [csa]