ÖNORM CEN/TS 12977-5

ÖNORM CEN/TS 12977-5 specifies performance test methods for control equipment. This document contains requirements on accuracy, durability and reliability of control equipment. The tests described are limited to components delivered with or for the system by the final supplier. For the purposes of this document controller and control equipment for solar heating systems and auxiliary heaters, if part of the system, are restricted to: Controllers as system clocks, timers and counters, differential thermostats, multi-function controllers. Sensors as temperature sensors, irradiance sensors, pressure sensors, level sensors, flow meters or heat meters. Actuators as pumps, solenoid and motor valves or relays. An additional objective of the procedures described in this document is to verify control algorithms and, together with the accuracy of sensors, to determine control parameters. Beside results of verification of the functioning of a controller, its equipment and actuators, the determined parameters may be used for numerical system simulations. This document is valid for control equipment of solar heating systems for the purpose of hot water preparation and/or space heating. If the solar system is connected to or part of a conventional heating system, the validity is extended to the entire system. It is valid for: Factory made solar heating systems, small custom built solar heating systems, large custom built solar heating systems and auxiliary heater equipment. There are two categories of solar heating systems: Factory Made solar heating systems and Custom Built solar heating systems. Custom Built solar heating systems are subdivided into two categories: Small Custom Built systems offered by a company are described in a so-called assortment file, in which all components and possible system configurations, marketed by the company, are specified. Large Custom Built systems are uniquely designed for a specific situation.