Standards Development

Scope

This document specifies safety, design, construction, and performance requirements and testing for electronic fuel/air ratio control (FARC) /systems. . Systems may include sensors, mechanical actuators and/or motor/blower that make up the complete system. Systems can be described as, but not limited to:

—     closed loop fuel/air ratio control systems (ERC), see 3.1.1;

—     closed loop fuel/air ratio trim systems (ERT), see 3.1.2;

—     fuel/air ratio supervision systems (ERS), see 3.2.

Note 1 Throughout this document, the word “System” means “FARC control and system components”.

These systems are intended for use with burners and appliances burning gaseous or liquid fuels. This document describes the procedures for evaluating these requirements and specifies information necessary for installation and use.

This document applies to the inherent safety of the system and its , to the declared operating values, operating times and operating sequences where such are associated with FARC safety and to the testing of FARC systems used in, on, or in association with, appliances .

Note 2 The documents for burners, appliances or processes which use ERC, ERS or ERT can override the requirements of this document.

This document prescribes testing requirements in addition to the relevant standards for integrated devices or components (e.g., actuators) to ensure safe operation of the FARC system.

If no part 2 standards in ISO/TC161 or IEC/TC72 exist, then IEC 60730-1 has to be considered.

Note 3 Supplemental or modified requirements and tests and evaluations can be needed for ERC, ERS or ERT system to fulfil relevant burner, appliance or process standards. Compliance of an ERC, ERS or ERT with this standard does not imply that such systems or components thereof are acceptable for use on an appliance without supplemental tests of the control system applied to the particular appliance to fulfill the requirements of the relevant burner, appliance or process standard(s).

This document applies to electronic fuel/air ratio control systems that can be tested independently or as a system or as part of an appliance or as part of a burner.

This document does not cover burner control function like e.g. burner ignition, flame supervision, and fuel shutoff