BS/EN 16830-2017 pdf download.Safety and control devices for burners and appliances burning gaseous or liquid fuels Control functions in electronic systems Temperature Control function.
3.104
combustion products discharge safety device
TTB
appliance control function that at least causes safety shut-down of the main burner when there is an unacceptable spillage of combustion products at the draught diverter
[SOURCE: EN 15502-2-2:2014, 3.1.4.101]
3.105
temperature control function
TCF
appliance control function that controls the temperature (temperature regulator) and prevents the risk of excessive temperature (temperature limiter) which could lead to the hazard of overheating in gas and liquid fuel burning appliances by initiating at least a shut-down of the main burner
4 Classification
4.1 Classes of control
EN 13611:2015,4.1 is replaced by the following:
The safety class of a TTB Appliance Control Function can be class A. class B or class C, depending on the application. The safety class of the TTB shall be stated in the installation and operating instructions.
The TCF shall be safety class C.
A lower class may be acceptable if this is proven by the analysis of the preventative measures within the
appliance. The safety class of the TCF shall be stated in the installation and operating instructions.
A TCF may consist of various independent hardware and software devices. These individual devices,
being part of the TCF, shall be classified as class A, class B or class C.
4.2 Groups of control
EN 13611:2015,4.2 is not applicable.
4.3 Classes of control functions
Shall be according to EN 13611:2015, 4.3.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2015, 4.4.
6.5 Electrical parts of the control
6.5.1 General
Shall be according to EN 13611:2015, 6.5.1 with the following addition:
The switching actions and the reset as indicated in Figure 2 are an integral part of the TCF. For multifunctional controls, the TCF or parts of it can be physically integrated in other functional blocks (e.g. Automatic Burner Control).
6.5.2 Switching elements
Shall be according to EN 13611:2015,6.5.2.
6.5.3 Electrical components
6.5.3.1 Performance of electrical components
Shall be according to EN 13611:2015, 6.5.3.1.
6.5.3.2 Test
Shall be according to EN 13611:2015, 6.5.3.2.
6.5.3.3 Sensing element
Shall be according to EN 13611:2015,6.5.3.3 with the following addition:
To withstand temperature overshoot after a protective action, the sensing element, being in contact with this temperature, shall be able to withstand a maximum temperature as declared in 7.1. This is the maximum temperature that the sensor will face in its application for a short period of time. During the long-term performance tests of 7.10.101 b) and d) this extreme temperature shall be maintained for 10 mm each for the last 10 cycles.
The sensing element of the TTB shall not be removable without tools, incorrect refitting, after servicing shall be made difficult.
For TCF Appliance Control Functions, where the safety depends on the correct location of the sensing elements, these sensing elements shall not be removable without tools. Incorrect refitting, after servicing shall be made difficult.
For TTB and TCF based on sensors other than temperature sensors, equivalent requirements shall be applied.
6.5.3.4 Gas controls employing electrical components in the gas way
EN 13611:2015, 6.5.3.4 is not applicable.
6.6 Protection against internal faults for the purpose of functional safety
6.6.1 Design and construction requirements
6.6.1.1 Fault avoidance and fault tolerance
6.6.1.1.1 General
Shall be according to EN 13611:2015. 6.6.1.1,1 with the following addition:
— TCF shall be safety class C.
EN 13611:2015, 6.6.4.2 c) and 6.6.4.3 a)0 are not applicable.
The fault reaction time shall be stated in the installation and operating instructions.
— TTB as a class B function
The requirements for protection against internal faults for the purpose of functional safety as given in
6.6 of EN 13611:2015 shall apply, with the exception of EN 13611:2015, 6.6.3.2 c).
The fault reaction time shall be stated in the installation and operating instructions with a limit of 24 h.
— TTB as a class C function
Requirements for protection against internal faults for the purpose of functional safety as given in 6.6 of
EN 13611:2015 shall apply, with the exception of EN 13611:2015, 6.6.4.2 c) and 6.6.4.3 a).
The fault reaction time shall be stated in the installation and operating instructions.
6.6.1.1.2 System design
Shall be according to EN 13611:2015, 6.6.1.1.2.
6.6.1.2 Lock-out function
Shall be according to EN 13611:2015, 6.6.1.2.
6.6.1.3 Reset device
Shall be according to EN 13611:2015, 6.6.1.3.
6.6.1.4 Documentation
Shall be according to EN 13611:2015, 6.6.1.4.
6.6.2 Class A.BS/EN 16830-2017 pdf download.

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