Document # 50079 Rev. D 05/23/97
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4.7 Door Release Service
This application illustrates the use of the FCPS to power 24 VDC door holders. A signal
must be supplied from the FACP to activate the FCPS's outputs. This signal should
consist of a 24 VDC source run through a set of normally closed alarm contacts. During
a normal (nonalarm) condition, 24 VDC should be applied to the FCPS. This will result
in the outputs of the FCPS being activated which will in turn energize the door holders.
When the FACP enters an alarm condition, the relay contact will open and remove the
24 VDC signal from the FCPS, causing the doors to close.
Control Input #1
+ 24 VDC nonresettable
Relay Common
Relay Normally Closed
Power Supply Common
Fire Alarm
Control Panel
Control input #2
Notes:
1) During a normal condition (nonalarm), +24 VDC should be applied to TB3-1 and TB3-2.
2) The normally closed alarm relay may consist of an actual relay in the Fire Alarm Control Panel
or a control module. If a control module is being used, it may be mounted remotely or at
the control panel.
3) A monitor module may be used to monitor the trouble contacts of the FCPS.
4) Nonresettable power must be used from the FACP.
5) A maximum of 4.0 amps may be drawn continuously for holding doors.
6) For a list of compatible devices, refer to the Fire-Lite Device Compatibility Document.
7) Loss of AC power may cause doors to close due to a momentary power drop while switching
over to batteries.
Note 4
Typical 24 VDC Door Holder circuits.
Use polarized devices only.
Figure 4-7: Using the FCPS with 24 VDC Door Holders
Refer to Section 1.1 for current ratings.
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