10 en | Installation Conventional Automatic Fire Detectors
2021.03 | 11 | F.01U.004.377
User manual
Bosch Sicherheitssysteme GmbH
MSC420
The MSC420 Additional Base was designed specially for surface
mounted cable feed via cable protection conduits. It is used in
combination with any of the above listed bases. It has two
opposing pre-cut inlets of 20mm diameter and two additional
opposing and prepared inlets for up to 28mm diameter.
The additional base has a diameter of 120mm and a height of
36.7mm.
To protect against condensed water penetration, a seal made of
TPE is situated on the base of the MSC420.
4.2 Overview of Detector Base Sounder
Detector base sounders are used if the acoustic signaling of an alarm is required directly at
the location of the fire.
– MSS300 Base sounder white, for conventional
technology, connection via the detector C point.
– MSS300 WH-EC Base Sounder, white for conventional
technology, with external activation.
The integrated tone generator has 11 tones for selection (incl.
tones according to DIN33404 and EN457) with sound
pressure of max. 100dBA, depending on the type of tone
selected.
The tone type on conventional variants is set via four DIP
switches and the volume adjusted continuously via a
potentiometer.
Surface mounted and flush mounted cable feed are possible.
4.3 Mounting the Bases
The detector bases are screwed to the even, dry surface using two screws approx. 55mm
apart.
In the case of cable feed for surface mounting, break out the prepared entry points (X) on the
housing.
In the case of flush mounted cable feed, route the cable through the opening in the centre of
the base.
The short mounting bores marked in the sketch with “Y” may be used only for fixing over a
back box.
Notice!
Cable feed and outfeed can be on the same side.
For cable feed at the FAA-420-SEAL and MSC420 puncture the sealing with a pointed tool.
Do not cut the sealing with a knife.
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