UTC Fire & Security Americas Corporation Inc 844-PIR User Manual

4. Carefully remove the PIR (lower) circuit board by pressing outward on either side tab, then 

pull up on the circuit board (see Figure 12).

5. Remove the PIR circuit board battery (located on opposite side of components) and install a 

new one, observing polarity (marked on the circuit board).

6. Re-install the PIR circuit board into the sensor plastic.
7. Re-install the transmitter circuit board onto the PIR circuit board.
8. Install a new battery in the transmitter circuit board, observing polarity (marked in battery 

bucket).

After replacing batteries, wait at least 3 minutes before activating the walk test mode.

Lithium batteries that are no longer usable are considered hazardous waste. Be sure to properly 
dispose of the old batteries. Contact your local city government for hazardous waste disposal 
laws.

Use the following guidelines if the system does not respond correctly when the sensor is acti-
vated. 

•

Check programming and re-program sensor into panel if necessary.

•

Move the sensor to another location and test for correct response.

•

Test a known good sensor at the same location.

•

If the system does not respond, avoid mounting a sensor at that location.

•

If the replacement sensor functions, return the problem sensor for repair or replacement.