36
Normally a diagram as shown in Fig. 41. will appear. The
pressure peaks in the diagram are caused by the rapid move-
ment of the window or the door and therefore they are not
relevant for the interpretation of the diagram.
In Fig. 41 the pressure drop is about 2,0 Pa.
The reliability of the system is considered suffi-cient, when
the pressure drop caused by opening and closing the window
is less or equal to 4 Pa (8 Pa in the case of wood burning
without surrounding air).
After the 4 Pa test is completed, "4 Pa Test" will be marked
by a tick mark in the main menu. Se-lect "Print" from the main
menu to print out the readings and select "Save measure-
ments" (see chapter 0) to save them.
For the detailed procedure according to the Technical Rules
for Gas Installations (TRGI), working sheet G 625 (2009), it is
necessary to replace the fireplace by the Wöhler DP 23 (see
manual Wöhler DP 23).
Fig. 41: Diagram 4 Pa Test
Fig. 42: 4 Pa Test with Wöhler DP 23
