Hochiki YBO-BS Guide D'installation page 4

the terminals on the YBO-BS hold the sensor,
beacon or cap if being used as a wall sounder
(see below). For correct wiring of the
appropriate mounting base, please refer to the
diagram below.
Locking Mechanism
The base sounder can be locked onto the
relevant mounting base by removing a plastic
lug on the underside of the sounder (see Fig.
3).
Fig 3.
The sounder can then only be removed by
using a special Removal Tool (TSC-SRT),
which is available from Hochiki Europe (UK)
Ltd.
Using the YBO-BS as a Wall Sounder
A twist-fit cap (SI/CAP2) is available to cover
the electrical connections if an analogue
sensor, beacon or indicator is not being fitted
(see Fig. 2). Align the rib on the edge of the
cap with the rib on the edge of the base
sounder/beacon. This will ensure the three
moulded tabs on the inside of the cap will
engage with the matching metal bayonet slots
on the top of the base sounder/beacon.
Wiring
Please refer to the diagrams at the end of this
document for wiring the Standard Mounting
Base (YBN-R/3) and the Short-Circuit Isolator
Mounting Base (YBO-R/SCI).