UTC Fire & Security Americas Corporation Inc 840B-SHK User Manual

2

Caution!
You must be free of all static electricity when handling elec-
tronic components. Touch a grounded, bare metal surface 
before touching a circuit board or wear a grounded wrist 
strap.

1. Insert a slotted screwdriver into the slot at the top end of 

the unit and remove the cover by lifting it up (see 
Figure 2).

2. Using the flathead mounting screws, secure the base to 

the mounting surface either vertically or horizontally as 
required (see Figure 3).

3. Position the shock element and press it firmly into its 

socket.

Note
On a horizontal surface (sill or ledge), any orientation is 
allowed, but certain sensor element orientations are better 
than others. The element is much better at detecting hori-
zontal vibrations perpendicular to its writing than it is parallel 
vibrations (see Figure 5).

4. If using the reed switch, use the two remaining screws to 

mount the magnet so its arrow is aligned with the arrow 
on the sensor case (see Figure 7).

Important!
You must disable the reed switch using the dip 
switches on the circuit board if you are not using it. If 
the reed switch is enabled but no magnet is installed, the 
sensor will be in a continuous alarm state. See the Sensor 
Settings section for more information.

5. Install the tamper switch as shown (see Figure 7).

6. Install the 4.7 k Ohm EOL resistor across the terminals 

of the external switch block.

1   2   3  4

 

ON

1   2   3  4

 

ON

1   2   3  4

 

ON

1   2   3  4

 

ON

1   2   3  4

 

ON

1   2   3  4

 

ON