The built in
GASTOP gas leak detector is set to detect a concentration between
5% and 15% I.E.L. (Inferior explosion limit), this limit varies on
the basis of room conditions, but never exceeds 20% I.E.L. during
the first 4 years of use. Just one minute after turning it on, the
TEST procedure can be run to check it works correctly. The GASTOP
must be positioned as shown in the diagram above. We recommend that
a specialised electrician installs the detector.