EN 12067-2:2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
  3.1 electronic gas/air ratio control (electronic GARC)
  3.2 electronic control box (ECB)
  3.3 actuator
  3.4 sensor
  3.5 combustion process
  3.6 defined safe state
  3.7 fault tolerating time
  3.8 safety shut-down
  3.9 lock-out
       3.9.1 non-volatile lock-out
       3.9.2 volatile lock-out
  3.10 abnormal operation
  3.11 form closure construction
4 Classification
5 Units of measurement and test conditions
6 Construction requirements
  6.1 General
  6.2 Mechanical requirements
       6.2.1 General
       6.2.2 Special requirements for electromechanical
             actuators with position feed-back sensors
  6.3 Electrical equipment
       6.3.1 General
       6.3.2 Class of protection
       6.3.3 Electronics and software
7 Functional requirements
  7.1 General
  7.2 Burner control interface
  7.3 Safety shut-down initiated by the electronic GARC
  7.4 Start-up sequence
  7.5 Preset/predefined range
  7.6 Restart from defined safe state
  7.7 Accuracy requirements
       7.7.1 General
       7.7.2 Sensor(s) and actuators
       7.7.3 Repeatability
  7.8 Protection against internal faults
       7.8.1 Failure modes of components
       7.8.2 Safety class
  7.9 Information to be supplied by the manufacturer
  7.10 Documentation
  7.11 Assessment
8 Protection against environmental influences
  8.1 General
  8.2 Test conditions
  8.3 Performance tests
       8.3.1 At ambient temperature
       8.3.2 At low temperature
       8.3.3 At high temperature
  8.4 Void
  8.5 Endurance
       8.5.1 General
       8.5.2 Vibration test
       8.5.3 Humidity
  8.6 EMC-requirements
       8.6.1 General
       8.6.2 Supply voltage variations
       8.6.3 Supply voltage interruptions or decreases
       8.6.4 Supply frequency variations
       8.6.5 Surge immunity
       8.6.6 Electrical fast transient burst
       8.6.7 Electromagnetic conducted and radiated
             disturbances induced by radio-frequency fields
       8.6.8 Electrostatic discharge immunity
9 Marking and installation
  9.1 Marking
  9.2 Installation and operating instructions
  9.3 Warning note
Annex A (informative) Approval path for the electronic GARC
Annex B (normative) Manufacturer's declaration for sensors,
                       actuators and repeatability
Annex C (normative) Special requirements for single position
                       feed-back potentiometers in electromechanical
                       actuators
Annex ZA (informative) Clauses of this European Standard addressing
                       essential requirements or other provisions of
                       EU Directives

This European Standard specifies the safety, construction and performance requirements for electronic gas/air ratio control systems (GARCs) intended for use with gas burners and gas burning appliances. It also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use.This standard is only applicable to closed loop gas/air ratio controls (see 3.1) and does not differentiate into classification by heat input.This standard applies to electronic GARCs that can be tested independently, as well as part of an appliance or a gas burner.