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Sample Applications

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6.3 Door Holder Application

In a typical door holder application, the door holder power must be interrupted to close all fire

doors under the following conditions:

• Any active alarm condition.

• AC power is no longer present (to conserve battery power).

To close the fire doors in these situations, wire an N.C. programmable relay from the fire

panel in series with the auxiliary power to the door holders as shown in Figure 6-7.

The circuit shown in Figure 6-7 will provide up to 3 amps of door holder power. (See Section

6.2 if you need more than 3 amps of auxiliary power.) The power in this example is released

when AC power is off for 30 seconds or more, or when the relay from the fire panel becomes

open. You would have to use the equivalent of a programmable relay from a fire alarm control

panel that is programmed to transfer under alarm conditions. See Section 4.10.4 for selecting

auxiliary power options.

Figure 6-7 Door Holder Wiring Example

5499

Fire Panel

ESL DHX 1224

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SILENT KNIGHT 5104B Installationshandbuch Seite 30