Shield Shiel A-XT - Releasing Circuit

Installation 3
Shield Fire, Safety and Security Ltd.
Shield A-XT Releasing Fire Control Panel - Installation and Operation Manual SEXTCP-OM
Revision E01.00
31 of 127
The figure below illustrates NAC1 wiring on the Shield A-XT Releasing Fire Control Panel:
Figure 3-10
NAC1 Wiring
To install Notification Appliance Circuits (NACs) on the Shield A-XT Releasing Fire Control Panel:
Releasing Circuit
This section describes how to install releasing devices on the EXTING terminals of the Shield A-XT Releasing Fire
Control Panel. The Shield A-XT Releasing Fire Control Panel operates releasing devices in compliance with Fire
Protection Service Valves under UL 260, UL 429 and UL 429A.
The Shield A-XT Releasing Fire Control Panel provides releasing operation on the EXTING terminals.
To maintain UL compliance during installation:
• Connect releasing devices to the EXTING terminals
• Connect releasing devices with the correct wire gage and length
• Connect only authorized Shield releasing devices for Fire Protection Service Valve operation
• Connect EOL diode, 1N504-G, SEOLD-504 to the releasing solenoid
Solenoid Wiring
Solenoids must have a resistance of greater than 30 Ohms to ensure that the maximum current rating of the releasing
output is not exceeded.
Shunt releasing solenoids with the End of Line Diode (EOLD) 1N504-G, SEOLD-504. The EOLD SEOLD-504
provides supervision for releasing circuits and prevents solenoid EMF spikes from interfering with the operation of the
fire control panel.
Connect the EOLD 1N504-G, SEOLD-504 in the same junction box as the Releasing Solenoid.
1 Connect Notification Appliances and End-Of-Line-Devices to the NAC channel.
Notification Appliances must be wired in a daisy-chain without T-Top connections.End-Of-Line-Devices must be
connected to the last Notification Appliance in the daisy-chain.
2 Maintain the limit for maximum wire length of the circuit.
3 Maintain maximum current limits and loading.
NAC 1
( + )
( - )
( + )
( - )
( + )
( - )
Polarized
Annunciator
Polarized
Annunciator
10K Ohm
EOL Resistor
SEOLR-10