EN 14597-2012 pdf download.Temperature control devices and temperature limiters for heat generating systems.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 60730-2-9:2010, Clause 2 and the following apply.
3.201
operating differential
difference between the upper and lower values of the operating value: for control devices types TB, STB, and ASTB, the difference between the fixed limit value and the temperature at the sensing element at which a manual reset is possible
Note 1 to entry: The definition according to EN 60730-1:2011. has been modified.
3.202
temperature sensing control type TR
thermostat or modulating thermostat used in heat generating systems for controlling the temperature of liquid or/and gaseous media, which has provisions for setting by the user and which, if equipped with an electrical output, provides at least type 1 B action
Note 1 to entry: See 2.2.4 and 2,2.6 of EN 60730-1:2011 and see 2.2.105 of EN 60730-2-9:2010. Note 2 to entry: Elsewhere in this document, this device is designated by the device code TR.
3.203
temperature sensing control type FR
combustion control used in heat generating systems, which is a TR influencing the supply of combustion air for solid fuels as a function of the temperature of the controlled medium
Note 1 to entry: Usually these devices are mechanical. If they are electrical, they will be TRs with an additional actuator. See EN 60730-2-14 for control of the air flow.
Note 2 to entry: Elsewhere in this document, this device is designated by the device code FR.
3.204
temperature sensing control type TW
temperature operating control for heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which, if electrical, provides type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool
Note 1 to entry: TW is a monitoring control as a class A control function according to EN 60730-1:2011 – Note 2 to entry: Elsewhere In this document, this device is designated by the device code TW.
3.205
temperature sensing control type STW
safety thermal cut out: protective control for heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which provides type 2P and type 2K actions, and, if electrical, type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool
Note 1 to entry: Type 2K action will be considered to be provided if type 2N action is provided.
Note 2 to entry: This device is typically required to prevent overheating in heat generating systems under abnormal operation conditions (see EN 483 and EN 1020).
Note 3 to entry: See also EN 60730-1:2011.
Note 4 to entry: Elsewhere in this document, this device is designated by the device code S1W.
3.206
temperature sensing control type ATW
safety thermal cut out: protective control for limiting the flue gas temperature in heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which provides type 2P and type 2K actions, and, if electrical, type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool
Note 1 to entry: The concept of extended safety”, which is the action of a temperature limiting device to cut out or limit the temperature of the controlled application, should a fault internal to the control occur, has been worked into 2.205 and other definitions, For the same purpose, Notes 8 and 9 have been added to Table AX.1 which contains the requirements for software class and fault analysis of controls using electronic devices.
Note 2 to entry: Elsewhere in this document, this device is designated by the device code A1W.
3.207
temperature sensing control type Th
STW used as a thermal bypass protection for solid fuel heat generating systems and which senses the heated media temperature and operates to cause energy to be carried off by opening a regulating unit, a. g. a valve:
the settings of this control are unchangeably fixed
Note 1 to entry: Usually this is a mechanical device. This function could also be provided by an S1W controlling a valve.
Note 2 to entry: Elsewhere in this document, this device is designated by the device code Th.EN 14597-2012 pdf download.

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