6.3 Auxiliary relays
There are three on-board relays on the FACU, see Figure 17. The contact rating is 30 VDC at 2 A, 0.35 power factor. Each relay is selected
for normally closed or normally open operation. For information about relay settings see Table 7.
All three relays are non-programmable:
• Relay 1 is the default for the common trouble relay and is normally energized. When the control unit is completely powered off, the
default setting of the trouble relay is Off Normal.
• Relay 2 is the common alarm and the default setting for Relay 2 is On Until Reset.
• Relay 3 is the common supervisory.
Figure 17: Auxiliary relay connections
Table 7: Relay settings
Ref designator Functions Settings Jumper position
Normally closed (default)
1-2 (Left)
P7 Relay 1 contact setting
Normally open
2-3 (Right)
Normally open (default)
1-2 (Left)
P6, P5 Relays 2 and 3 contact setting
Normally closed
2-3 (Right)
6.3.1 Wiring an auxiliary relay
To wire an auxiliary relay, ensure you adhere to the following guidelines:
• All wiring is between 18 AWG minimum and 12 AWG maximum.
• Conductors test free of all grounds and stray voltages before you connect the auxiliary relay to the control unit and other appliances.
• All wiring is unsupervised.
• Power all Aux. relay loads from the Aux. power circuit or from a regulated, 24 VDC, power limited power supply that is UL-listed for fire
protective signaling service.
6.4 RS485 Interface
This section describes the RS485 interface. Use the RS485 interface to connect annunciators.
• You can connect a maximum two numbers of 2606-9111 annunciators to the 2004-9101 control unit.
6.4.1 Wiring an Annunciator
To wire an annunciator, adhere to the following guidelines:
• All wiring is between 18 AWG minimum and 12 AWG maximum.
• All wiring is supervised and power limited.
• Conductors must test free of all grounds and stray voltages before you connect the annunciator to the unit and other appliances.
• For bus style wiring, the maximum wiring limit is 4,000 ft. (1219 m) For bus style wiring, see Figure 19.
Note: Figure 19 shows communication wiring only.
• For T-Tap style wiring, the maximum distance to the furthest device is 2,500 ft. (762m). For T-Tap style wiring, see Figure 20. Figure 20
shows communication wiring only.
• The maximum wiring capacitance is 0.58 μF.
page 25 579-1402 Rev B
2004 Foundation Series Fire Alarm Control Unit Installation Guide
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