Edwards 3-ASU/FT Assembly instructions

© 2013 UTC Fire & Security. All rights reserved. 1 / 4 P/N 270481 • REV 06 • REB 18JAN13
3-ASU/FT Audio Source Unit with Firefighter
Telephone Installation Sheet
Description
The 3-ASU/FT provides controls for emergency paging and
two-way communication between the fire alarm control panel
and firefighter telephone stations.
The 3-ASU/FT can store and play back prerecorded messages
and has inputs for connecting remote microphones and
MN-FVPN VoIP Encoder/Decoder modules.
The 3-ASU/FT requires one chassis space in an enclosure.
Specifications
Voltage
24 VDC
Current
Standby
Alarm
112 mA
112 mA
Ground fault
impedance
0.1 Ω
Wire size
ASU card
FTCU card
22 to 12 AWG (0.5 to 2.5 mm²)
22 to 14 AWG (0.5 to 2.5 mm²)
Dimensions
12.0 × 19.0 × 5.25 inches
(30.48 × 48.26 × 13.34 cm)
Mounting
One chassis space
Audio channels
8 simultaneous
Audio inputs
Local microphone (isolated and supervised)
Remote microphone (isolated and
supervised)
Firefighter's telephone (isolated and
supervised)
Remote audio (isolated and supervised)
Prerecorded message
storage
Two minutes expandable to 100 minutes with
optional 3-ASUMX/nn memory card
Telephone riser
EOL resistor
Active telephones
Wire type
Configuration
Line impedance
15 kΩ (P/N EOL-15)
5 max.
Twisted pair, shielded
Class A or Class B
52 Ω, 0.2 µF, max.
Operating environment
Temperature
Humidity
32 to 120°F (0 to 49°C)
0 to 93% RH, noncondensing at 90°F (32°C)
Contact information
For contact information, see www.edwardsutcfs.com.
Installation
WARNING: Remove all sources of power from the cabinet
before installing or removing components. Failure to do so may
result in serious injury or loss of life.
1. Attach the chassis to the backbox using the hardware
provided. Align the backbox mounting studs with the holes
indicated in Figure 1.
2. Attach the ASU and FTCU cards to the chassis using six
6/32 × 3/8 pan head screws each. Press the RCIC card
onto the PEM studs. See Figure 2.
3. Connect ribbon cables (P/N 250195-00) between the ASU
card, the FTCU card, and the RCIC card.
4. If used, install the 3-ASUMX memory card. Make sure the
write protect switch is in the “off” or “write enabled”
position.
5. Connect the RCIC card to the other chassis rail
assemblies. See Figure 7.
6. Plug the ribbon cable (P/N 250194-00) from the 3-ASU
cover assembly into J3 on the ASU card. See Figure 4.
7. Lift the 3-ASU cover assembly onto the chassis mounting
studs then attach it with the locknuts provided in the
hardware kit. See Figure 3.
8. Plug the ribbon cable (P/N 250194-00) from the 3-FTCU
cover assembly to J3 on the FTCU card. Make sure the
microphone cable is securely connected. See Figure 4.
9. Lift the 3-FTCU cover assembly onto the chassis mounting
studs then attach it with the locknuts provided in the
hardware kit. See Figure 3.

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Figure 1: Chassis mounting diagram
Figure 2: Circuit board mounting diagram
Figure 3: Installation complete
Figure 4: Cover installation
Wiring
Wire the 3-ASU/FT as shown in Figure 5, Figure 6, and
Figure 7.
Notes
•All wiring is supervised and power-limited.
•If a 3-RS485 card is not installed, connect AUDIO DATA
PRIMARY on the ASU card to AUDIO A OUT on the
3-CPUx card. See Figure 5.
If a 3-RS485 card is installed, connect AUDIO DATA
PRIMARY on the ASU card to AUDIO A IN on the 3-CPUx
card.
•Wiring from a 3-REMICA or 3-REMICP must be shielded
and enclosed in conduit. See Figure 5.
•All shields must be continuous and insulated from ground,
except at the originating panel.
•The REMOTE input is for MNEC applications only. Not for
supplemental use.
•Terminate Class B telephone risers with a 15 kΩ EOLR.
Do not install an end-of-line resistor if the riser is wired
Class A. See Figure 6.

P/N 270481 • REV 06 • REB 18JAN13 3 / 4
Figure 5: ASU card wiring diagram
Figure 6: FTCU card wiring diagram

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Figure 7: RCIC card wiring diagram