Silent Call SD4-SS - Manual (Page 23)

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diameter of 0.18 inch (the detector will trigger and then the smoke
detector will go into alarm thus sending a transmitting signal to
the receiver. If the tool is removed from the recessed switch the
sounder will shut off)
Recessed Test Switch Opening
Test Switch
Green LED
Red LED PUSH RECESSED
SWITCH WITH A
0.18’ MAX
DIAMETER TOOL