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4.18.4 NFPA 72 Polarity Reversal
NOTE: Intended for connection to a polarity reversal circuit of a control unit at the protected premises having compatible rating.
Using the 5220 Module
When the 5220 is wired and programmed for polarity reversal, it reports alarm and trouble events to a remote site. Alarms will override
trouble conditions and it will not be possible to reset the remote indicator until the condition is cleared and the control panel is reset.
If an alarm condition occurs, the alarm relay will close, overriding the trouble condition.
Standby Current: 100 mA, 24 VDC
Alarm: 100 mA, 24 VDC
To install the 5220 for polarity reversal, follow the steps below:
1.
Locate the knockout on the right side of the control panel cabinet to connect the 5220 using a short piece of conduit (must not
exceed 20 feet in length).
2.
Wire the 5220 to the control panel using the four-wire pigtail provided as shown in Figure 4.57. This diagram also shows how to
connect the 5220 to the remote indicator.
3.
Connect earth ground wire to the 5220 chassis with mounting screw.
4.
Program the circuit used as a notification circuit, continuous and non-silencing. Refer to Section 9.5 for point programming,
Section 9.4 for group settings, and Section 9.3 for zone settings and mapping.
5.
If necessary, adjust loop current using the potentiometer (R10) on the 5220 board. Normal loop current is 2-to-8 mA with a 1k ohm
remote station receiving unit. Maximum loop resistance is 3k ohm.
Using the 7644-L8 Module
When the 7644-L8 is used for polarity reversal, it allows alarm and trouble events to be reported to a remote site. Alarms will override
trouble conditions and it will not be possible to reset the remote indicator until the condition is cleared and the control panel is reset.
To install the 7644-L8 for polarity reversal:
1.
Wire the 7644-L8 to the control panel as shown in Figure 4.58. Do not install an EOL resistor on the terminals of the circuit used.
2.
Program the circuit as a notification circuit.
3.
Map the group to activate constant on from the zone event. See Section "Zone Accessory Options" on page 117.
6820 / 6820EVS Manual P/N LS10144-001SK-E:C 09/28/2017
Figure 4.57 Polarity Reversal Connection Using the 5220 Module
All circuits power-limited.
All wiring supervised.
Jumper these terminals
when City Box is not used.
Intended for connection to a Polarity Reversal
circuit of a Remote Station receiving unit having
compatible ratings.
65
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