cen:proj:78257

CEN/TS 15502-3-3: Gas-fired central heating boilers – Part 3-3: 100 % Hydrogen – Expansion of EN 15502-2-1:2022

Scope

The scope of TS 15502-3-3 shall be according to EN 15502-2-1:2022, clause 1, with the following modifications:

Replace
“This document covers gas-fired central heating boilers from the types C1 up to C(11) and the types B2, B3 and B5:”
By:
“This document covers gas-fired central heating boilers from the types C1 , C3 up to C9 and the types B2, B3 and B5 :”

Replace
b) ...
by:
b) that use use combustible gases of gas group 4Y at the nominal pressure of 20 mbar;

Delete k) .... (as is not applicable).

Add at the end of the list (after k):
l) which are fully premixed appliances equipped with a Pneumatic Gas/Air Ratio controller (PGAR) or an Adaptive Combustion Control Function (ACCF) that are intended to be connected to hydrogen gas grids where the quality of the distributed hydrogen gas is likely expected to stay within a Wobbe range of 42-46 MJ/m3.

Replace ab), ag), ah) and al) in the list following “This document does not cover all the requirements for:" by:
ab) appliances that are intended to be connected to gas grids where the quality of the distributed hydrogen gas is likely to vary outside the Wobbe range of 42-46 MJ/m3;
ag) C(10) boilers;
ah) C(11) boilers;
al) Partially premixed appliances equipped with an adaptive combustion control function (ACCF).