Digital Monitoring Products
1121 PIR Installation Sheet
2
1121 PIR Installation Sheet
Digital Monitoring Products
3
2. Use a Phillips head screwdriver to loosen the mounting screw
located on the PIR printed circuit board (PCB) and slide the PCB
out of the unit. See Figure 3 for the mounting screw location.
3. Select and open the appropriate knockout mounting holes on the
mounting bracket for the best mounting location. See Figure 4.
4. Use screws and wall anchors, if necessary, to mount the detector
base to the wall in a corner.
5. Reinstall the PCB back into the unit. Tighten the PCB mounting
screw to secure it into place. Do not overtighten.
6. Install the battery. See Installing or Replacing Batteries later in
this document.
7. Insert the cover back into the appropriate closing pins and tighten
the holding screw back into place.
Optional Bracket Mounting
The 1121 PIR can optionally be attached to a mounting bracket. The
bracket can be mounted to the ceiling or a wall location. Refer to Mounting the Unit, Figure 1 and Figure 5 as
needed.
1. Open the PIR and remove the battery and PCB.
2. Open the required bracket mounting knockout holes.
3. Reinstall the PCB and the battery.
4. Install the bracket on the wall or ceiling using the included screws.
5. Slide the assembled 1121 PIR onto the mounting bracket.
Bracket
Installation
Wall Mount Installation
Ceiling Mount Installation
Figure 5: Optional Bracket Mounting
Installing or Replacing Batteries
Note
: If the battery reaches the factory preset low level, a Low Battery signal is sent to the panel. The 1121 PIR
remains operational for approximately 30 days to allow adequate time to replace the battery.
Observe polarity when installing the battery. Use only 3.0V lithium batteries, DMP Model CR123, or the equivalent
battery from a local retail outlet.
Note: When setting up a wireless system, it is recommended to program zones and connect the receiver before
installing batteries in the transmitters.
1. If necessary, remove the unit from the wall mounting bracket. See Optional Bracket Mounting or Mounting the
Unit.
2. Remove the front cover. See Figure 1.
3. Remove the battery (if installed) before installing a new battery.
Caution:
Risk of fire, explosion, and burns. Do not recharge, disassemble, heat above 212°F (100°C), or
incinerate. Properly dispose of unused batteries.
4. Observe polarity and insert the lithium battery into the battery holder where indicated in Figure 3.
Figure 4: Knockout Hole Locations
A. Not in use.
B. Use for flat wall
mounting.
C. Corner mounting -
use all four holes.
Sharp left or right
angle mounting -
use one top hole
and one bottom
hole.
D. For bracket
mounting.
A
A
B
B
C
C
D
A
C
C
B
B
