BAS EN 12067-1/A1:2008

This Part of this European Standard, EN 12067 specifies the safety, construction and performance requirements for gas/air ratio controls for inlet pressures up to and including 500 mbar of nominal connection size up to and including DN 150 , intended for use with gas appliances for use with one or more fuel gases of the first, second or third families. It also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use. It applies to gas/air ratio controls for gas burning appliances that can be tested independently of the appliance. It applies to gas/air ratio controls which function by controlling a gas pressure (or differential pressure) output in response to an air pressure (or differential pressure) and to a furnace back pressure signal input, but gas/air ratio controls which change the air pressure in response to the gas pressure are not excluded. It does not cover mechanically linked valves and electronic systems. NOTE 1: Parts of the standard can be applied to the construction and performance of the ratio control function of multi-functional controls.