How to Double Interlock a Fire Sprinkler

Unnecessary discharge, though rare, can be disastrous A double interlock fire sprinkler system is ideal for sensitive areas where unnecessary discharge is particularly undesirable. This could be a computer room, archive, or refrigerated area. To activate this system, a sprinkler must activate due to a loss of air pressure and an independent fire detection device must also activate. If both of these things happen, the double interlock releasing panel will trigger the release of water into the system.

Difficulty:ChallengingDouble interlock releasing panelFire detection deviceCircuit wiring1

Begin by reading the instructions of your specific double interlock releasing panel model and make sure that you understand them. You should also test the releasing panel to ensure that it is operating correctly.

2

Make a detailed drawing of the complete fire sprinkler system and include details of all wiring. This should be kept with the double interlock releasing panel for future reference.

3

Turn off the power to any circuits you intend to work with.

4

Remove the double interlock releasing panel from the cabinet it will be kept in and attach the cabint to the wall, where it will be easily accessible for future work.

5

Pull all system wiring into the cabinet so that the module can receive a signal from both the fire sprinklers and from the independent detection device. Tag and mark the wires so that you can easily identify them later.

6

Install the double interlock releasing panel inside the cabinet, according to the manufacturer’s instructions.

7

Power up the panel using a battery to ensure that it is operating normally. If so, connect one of your system's circuits and test the panel again. This should be repeated until all circuits are connected.

Altering a fire sprinkler system is a complex task that should only be attempted by a professional.

Fire circuits must not be connected to standard high voltage circuits.

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