4: Nfpa 72 Polarity Reversal - Honeywell 6820 Manual

Control Panel Installation
4.19.4 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 trou-
ble 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 Current: 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. Do not install an EOL resistor in the terminals of the Flexput circuit used for this application.
3. Connect earth ground wire to the 5220 chassis with mounting screw.
4. Program the circuit used as a notification circuit, refer to Section 8.5.3. Assign the NAC circuit to an output group that is mapped to
activate with non silenceable constant output in response to a system general alarm condition.
5. If necessary, adjust loop current using the potentiometer (R10) on the 5220 board. Normal loop current is 2-8 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 trou-
ble conditions and it will not be possible to reset the remote indicator until the condition is cleared and the control panel is reset.

Installing the 7644-L8 for Polarity Reversal
1. Wire the 7644-L8 to the control panel as shown in Figure 4.59. Do not install an EOL resistor on the terminals of the circuit used.
NOTE: Use only Flexput/NAC circuits on the control panel for reverse polarity.
2. Program the circuit as a notification circuit. See Section 8.5.3.
58
NAC circuit 2 and Relay 1 used as examples.
Any NAC and relay circuit can be used.
orange
yellow
Program relay
for alarm
red
brown
Figure 4.57 Polarity Reversal Connection Using the 5220 Module
Jumper terminals
3 & 4 when City
1 2 3 4
Box is not used.
All circuits power-limited
All wiring supervised.
-
remote
indicator
Intended for connection to a Polarity
Reversal circuit of a Remote Station
receiving unit having compatible ratings.
6820/EVS Manual — P/N LS10144-001SK-E:E 4/6/2022
Remote Station Applications