DIN EN 834:2017-02

This European Standard deals with heat cost allocators with electrical power supply used for establishing the consumption value of room heating surfaces. It specifies the minimum requirements for the construction, materials, production, installation, function and evaluation of the displayed readings established by these measuring devices. The standard describes test procedures to establish compliance with the stated requirements and specifies instructions for the nature and scope of their execution. Heat cost allocators according this standard are intended to capture the proportionate thermal output of radiators in consumer units. If an account unit comprises consumer units of different types (for example technically different types of heating systems or differences due to the consumer behavior, for example industrial plants as opposed to private apartments), it could be necessary to divide this account unit into groups of users. Considering that heat cost allocators enable the determination of the heat consumption only of each radiator in a consumer unit as a share of the total heat consumption of the account unit and/or user group (see clause 4), it is therefore necessary to determine this total heat consumption. This takes place either by measuring the consumed fuel quantity or the amount of heat delivered (the latter by means of a heat meter, for example). For the appropriate use of heat cost allocators in accordance with this standard, the heating system needs to - correspond to the state of the art at the time of installation of the heat cost allocators and - be operated in accordance with the state of the art (see A.2). This standard specifies that heat cost allocators shall not be used for heating systems where the temperature limits of use of the heat cost allocators fall below and/or are exceeded, where the rating factor for the thermal output, KQ, cannot be clearly specified or where the heating surface is inaccessible. This applies usually to the following heating systems: - floor heating; - radiant ceiling heating; - flap-controlled radiators; - radiators with ventilators; - fan-assisted air heaters; - heating systems with steam-operated radiators.