44 NFS-320/E/C Installation Manual — P/N 52745:M2 7/1/14
Applications Releasing Applications
4.7.4 Connecting a Releasing Device to the Control Panel
Use TB6 (NAC#4), TB7 (NAC#3), TB8 (NAC#2), or TB9 (NAC#1) on the control panel for
NAC⁄Releasing Circuits. The releasing circuit must be supervised and use listed, compatible
releasing devices.
Circuit Requirements. When connecting a releasing device, note the following:
1. The control panel provides four NAC/Releasing Circuits (Style Y or Z). Each circuit can
provide 1.5 A. Total current drawn from the power supply cannot exceed 7.4 A in an alarm
condition (refer to Table A.2, “System Draw Current Calculations,” on page 54). Use
compatible UL-listed 24 VDC appliances only. For more information on compatible
appliances, refer to the Device Compatibility Document.
2. Refer to the Releasing Applications appendix in the NFS-320/E/C Programming Manual for
configuration details (such as setting the Soak Timer).
3. For applications using power-limited circuits:
a) Use an in-line supervisory device (P/N REL-2.2K) with control panel releasing circuits.
Connect the End-of-Line device as shown in Figure 4.7.
b) Program the releasing circuit for Type Code REL CKT ULC.
c) Circuits are supervised against opens and shorts.
4. For applications not requiring power-limited circuits
–
a) If the application does not require supervising the releasing device against shorts, in-line
supervisory devices (P/N REL-2.2K) are not required.
b) In non-power-limited applications, program the releasing circuit for Type Code
RELEASE CKT.
c) Limited energy cable cannot be used to wire a non-power-limited releasing device circuit
d) Maintain a 0.25 inch (6.35 mm) spacing between the non-power-limited releasing circuit
device wiring and any power-limited circuit wiring.)
WARNING:
Do not enable the BACKUP option switch for any of the four Notification Appliance Circuits (NACs) if
they are used for releasing functions!
CPU-320-RELCONN1.wmf
REL-2.2K (Use with Type Code
Rel Ckt ULC, or see Circuit
Requirement 4.)
Compatible UL-listed
24 VDC releasing device
B+ NAC/Releasing output (source)
B– NAC/Releasing output (source)
A+ Class A (return for NAC only)
A– Class A (return for NAC only)
Note: See text below for circuit requirements.
Figure 4.7 Typical Style 4 Connection of a Releasing Device to Control Panel
Control
Panel
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