How to Replace an Old Wired Alarm System

Written by marshal m. rosenthal
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If you have an old, wired alarm system in your home, you can update it by replacing the wiring with wireless transmitters. By doing this, you can continue to use the sensor plates that are already installed in the windows and doors, while gaining the maintenance-free advantages of a wireless system. You will need a standard wireless security system that includes wireless transmitters and a wireless control panel. Such systems are generally available at electronics stores. You'll also need to use a few household tools.

Skill level:
Moderate

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Things you need

  • Wireless security system
  • Window sensors
  • Door sensors
  • Phillips jeweller's screwdriver
  • Phillips screwdriver
  • Batteries

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Instructions

  1. 1

    Count the number of windows and doors that have sensor plates attached to them. Additional sensors will be included in the wireless transmission security kit. Purchase more sensor transmitters as needed, if you are expanding your system.

  2. 2

    Open one of the windows wired with the old alarm system. Unscrew the two screws on the side of the sensor receiver plate on the window sill, using the Phillips jeweller's screwdriver. Remove the wires that are wrapped around the screws.

  3. 3

    Open the battery compartment lid on the bottom or back of a wireless transmitter. Install an appropriate battery into the compartment with the positive and negative contacts lined up as shown inside the compartment.

  4. 4

    Wind the end of one of the two wires attached to the transmitter around one of the screws. Wind the end of the other wire attached to the transmitter around the other screw. Tighten the screws.

  5. 5

    Place the transmitter against the wall under the window sill without stretching the wires. Attach the transmitter to the wall with wood screws, using a Phillips screwdriver.

  6. 6

    Open a door that has sensor plates attached to it. Loosen the two screws on the side of the sensor receiver plate that is on the edge of the door frame, using the Phillips jeweller's screwdriver. Remove the wires that are wrapped around the screws.

  7. 7

    Open the battery compartment lid on the bottom or back of a wireless transmitter. Install an appropriate battery into the compartment with the positive and negative contacts lined up as shown inside the compartment.

  8. 8

    Wind the end of one of the two wires attached to the transmitter around one of the screws. Wind the end of the other wire attached to the transmitter around the other screw. Tighten the screws, using a Phillips jeweller's screwdriver.

  9. 9

    Place the transmitter against the wall to the side of the door frame. Screw the transmitter to the wall with wood screws, using a Phillips screwdriver.

  10. 10

    Repeat the above procedure at each window or door already equipped with a sensor plate. Remove all the wiring that connected the sensor plates to the old, wired control panel.

  11. 11

    Unplug the old, wired control panel's power cord from its wall outlet. Unscrew the wires connected to the alarm from the panel, using the Phillips jeweller's screwdriver. Unscrew the panel from the wall, using a Phillips screwdriver. Store the wired control panel for safekeeping.

  12. 12

    Open the battery compartment lid on the side or back of the wireless control panel. If necessary, remove any screws first, using a Phillips screwdriver. Install the appropriate type of battery or batteries, lining up the contacts as shown in the compartment. Close the lid and tighten any screws.

  13. 13

    Attach the wireless control panel to the wall with wood screws, using the Phillips screwdriver. Plug the panel's power cord into the outlet formerly used by the wired control panel. Loosen the "ALARM" screws on the panel, using the Phillips jeweller's screwdriver. Attach the wires connected to the alarm around the "ALARM" screws and tighten them.

  14. 14

    Press the "Sync" buttons on each of the wireless transmitters and on the wireless control panel to sync all of them together on the wireless network created by the wireless control panel.

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