Centralized audio applications
EST3 Installation and Service Manual 4.11
Installation
The URSM requires one-half of a standard mounting footprint
and should be installed where the power pigtails can reach the
power supply.
The GFD and CT1 must be installed in the same enclosure,
located adjacent to the fire alarm control panel. Jumper JP1 on
the GFD should be set to the 2-3 position.
Terminal connections
Refer to Figure 4-6.
Black pigtail = (-)24 Vdc power in
Red pigtail = (+)24 Vdc power in
TB1–1 to 3 = Channel 2, trouble relay contacts
TB1–4 to 6 = Channel 1, trouble relay contacts
TB1–7 = Channel 2, 70 Vrms audio riser input
TB1–8 = Channel 2, 25 Vrms audio riser input
TB1–9 = Firefighter’s Telephone riser input, Ch 2
TB1–10 = Channel 2, Riser input, common
TB1–11 = Channel 1, 70 Vrms audio riser input
TB1–12 = Channel 1, 25 Vrms audio riser input
TB1–13 = Firefighter’s Telephone riser input, Ch 1
TB1–14 = Channel 1, Riser input, common
Operation
The trouble relay will activate 45–60 seconds after a circuit
short, circuit open, or amplifier failure is detected.
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