Silent Call SD4-SS - Manual (Page 22)

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Dust Covers are an effective way to limit the entry of dust into the
smoke detector sensing chamber during construction. However, they
may not completely prevent airborne dust particles from entering the
detector. Therefore, it is recommended that the detectors be removed
before beginning construction or other dust producing activity. When
returning the system to service, be sure to remove the dust covers from
any detectors that were left in place during construction.
Smoke detectors are not to be used with detector guards unless the
combination has been evaluated and found suitable for that purpose.
Testing the Sensor
Detectors must be tested after installation and following periodic
maintenance. The Model #SD4-SS may be tested as follows:
A. Test Switch
1. A recessed test switch is located on the detector housing (see
Figure 10).
2. Push and hold the recessed test switch for a minimum of 5
seconds. Use a small screwdriver or Allen key with maximum