scope:

This standard applies to electronic equipment which controls heating systems with water as the heating medium and a flow temperature up to 120°C. The signals can be processed by using either analogue or digital techniques, or both. The particular equipment to which this standard applies covers both: stand-alone start optimisers, taking priority to the main controller during periods; controllers which contain an integrated optimum start or an optimum start-stop control function. NOTE: The optimum start-stop function can be integrated within a main control device such as an outside temperature compensated (OTC) controller. In this case the controller would be expected to meet both part 1 and part 2 of this standard. Safety requirements on heating systems and heating control systems remain unaffected by this standard. The actuators and the dynamic behaviour of the valves are not covered by this standard. The control equipment may or may not be connected to a data network.