4 Wiring the 2250 FACU
This section describes how to wire the 2250 FACU.
4.1 Wiring the 2250 control unit
Follow these guidelines when connecting power-limited (PL) systems:
1. Separate the PL circuit wiring from the NPL circuit wiring in the cabinet.
2. Maintain a minimum distance of 0.25 in. or 6.35 mm between NPL and PL wiring.
3. Check that the conductors test free of all grounds.
4. Provide a system ground for earth detection and lightning protection devices.
Note: Check that this connection complies with approved earth detection for each NFPA780. Earth Detection Threshold: 10 K
ohms from either positive or negative terminals.
5. Use copper conductors for all wiring, unless noted otherwise.
6. Keep excess slack to a minimum inside the back box enclosure.
7. Use wire ties to neatly dress and bundle the circuit wiring together.
8. Use unshielded wire. If you are using shield wire, leave the shield unterminated or open.
9. In areas of high lightning activity or in areas that have large power surges, use the 2081-9028 or the 2081-9044 Transient
Suppressor on monitor points.
10. Do not run wires through elevator shafts.
4.1.1 Wiring the AC power supply
To wire the AC power supply, complete the following steps:
1. Before handling the AC feed, use a voltmeter to verify that it is not live.
2. Ensure that the circuit is de-energized and tagged to prevent injury.
3. Wire the AC power from a dedicated circuit breaker or fuse that is rated at a maximum of 20 A in accordance with NFPA 72, NEC,
and local codes.
4. Check that the AC supply wiring is between 14 AWG minimum and 12 AWG maximum.
5. Connect a 12 AWG copper ground wire from a safety ground in the electrical distribution unit to the control unit's safety ground
stud.
6. The input voltage range for the AC power supply is:
- 120 VAC, 50 or 60 Hz
- 240 VAC, 50 or 60 Hz
Note: You are not required to select any configuration settings.
4.1.2 Connecting the backup batteries
Use the harness that comes with the control unit to connect the backup batteries to the system board in the same cabinet. For more
information, see Connecting the battery harness.
The system requires 24 V battery back up. Use two 12 V batteries that are connected in series.
page 14 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide
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