Product description
24VDC
UNUSEDUNUSEDUNUSED UNUSED
NAC/B
-+
TB1
J3
JP1
JP2
11
BACK-UP+NAC/BNAC/A
+--
Front view Rear view
The 20 and 40 watt zoned audio amplifier modules are key
components in emergency communication systems that
consist of audible and visible notification appliances. Models
are available in Class A and Class B versions. See Table 1 for
a list of model numbers. The amplifiers provide the following:
• 20 or 40 watts of power
• Standard output line levels of 25 Vrms or 70 Vrms
• A 1 kHz temporal (3-3-3) tone to use as an evacuation
signal and a 20 SPM tone to use as an alert signal in the
event of a failure of networked audio distribution
Each amplifier is also provided with an independently
controlled supervised, power limited 24 Vdc NAC circuit. This
facilitates the addition of visual notification appliances to audio
notification circuits.
Each zoned audio amplifier requires one space on the rail
chassis assembly.
Table 1: Models
Number Description
3-ZA20A 20 watt zoned amplifier
3-ZA20B 20 watt zoned amplifier
3-ZA40A 40 watt zoned amplifier
3-ZA40B 40 watt zoned amplifier
Audio power
module
subassembly
Audio amp
transformer
subassembly
J4
Output gain
adjust
Configuration
TB2
jumpers
--SS++
Class A or Class B audio
Class A or Class B 24 Vdc outputs
Class B audio
Class B 24 Vdc outputs
Class A or Class B audio
Class A or Class B 24 Vdc outputs
Class B audio
Class B 24 Vdc outputs
70Vr ms 25Vr ms
Configuration
jumper
3-ZA20A, 3-ZA20B, 3-ZA40A, 3-ZA40B
Zoned Audio Amplifiers
Specifications
Space requirements: 1 rail space
Frequency response: 400 Hz to 4 kHz at ±3 dB
Harmonic Distortion: < 7%
Audio circuit
Input: 8-channel, multiplexed digitized audio
Wiring: Class B (Style Y) or Class A (Style Z)
Output: 20 or 40 W at 25 or 70 Vrms
EOL resistor: 15 kΩ (internal on 3-ZA20A/40A)
24 Vdc NAC circuit:
Wiring: Class B (Style Y) or Class A (Style Z)
Voltage: 24 Vdc nominal
Current: 3.5 A
EOL resistor: 15 kΩ (internal on 3-ZA20A/40A)
For special applications, refer to EST3 ULI/ULC
Compatibility Lists (P/N 3100427).
Wiring
Termination: Wiring connects to removable terminal block
Max wire size: 12 AWG (2.5 mm sq)
Operating environment
Temperature: 32 to 120 °F (0 to 49 °C)
Humidity: 93% RH, noncondensing at 32 °C
Current ratings
Standby: 62 mA
Alarm: 1.12 A (3-ZA20A/20B)
2.48 A (3-ZA40A/40B)
Installation instructions
Caution: Operating the amplifier at an output greater than that
required by the speaker may overdrive the speaker circuit and
result in damage to the equipment
To install the amplifier:
1. Remove all power from the panel.
2. Set jumpers JP1 and JP2 on the audio power module
subassembly for 25 or 70 Vrms, depending on the input
required by the audio circuit speakers.
JP1 JP2
25 Vrms 2 to 3 2 to 3
70 Vrms 1 to 2 1 to 2
3. Set the jumper on the audio amp transformer
subassembly for 25 or 70 Vrms, depending on the input
required by the audio circuit speakers.
4. Slide the module into the required rail/slot position.
5. Gently push the module into the connectors to ensure
good contact.
6. Secure the module to the rail by pushing in the top and
bottom snap rivet fasteners.
7. Connect the field wiring.
Notes
• The gain control pot should be adjusted to the desired
output levels using a 1KHz signal after installation. Fully
counter clockwise is maximum gain and fully clockwise is
minimum gain.
Installation Sheet 27JUN07 P/N: 387463 REV: 4.0
3-ZA20A, 3-ZA20B, 3-ZA40A, 3-ZA40B - Zoned Audio Amplifiers 1 / 3
Wiring diagrams
Typical 25 or 70 Vrms notification appliance circuit wiring
Zone audio amplifier
TB1
BACK-UP
+--
+
-++
NAC/BNAC/A
SS
-
[4] [5]
Class B (Style Y)
Figure-2: Typical 24 Vdc notification appliance circuit wiring
24VDC
NAC/B
24VDC
NAC/A
+--+
NOTNOTNOT
USEDUSEDUSED
TB1
Zone audio amplifier
S S
Class A (Style Z)
Class A (Style Z)
UL/ULC
listed
EOL
[2]
UL/ULC
LISTED
EOL
[2]
Notes
1. All wiring is supervised and power-limited
2. Install listed 15k Ω resistor on last device only when wired as Class B (Style Y) riser
3. Polarity designations on connector indicate output signal polarity for circuit supervision. The polarity reverses in an alarm
condition.
4. Shield required when audio riser and telephone riser share the same conduit
5. Twisted pair not required only when audio circuit riser shares conduit exclusively with 24 Vdc riser or in conduit by itself
6. A maximum of 10 Signature Series CC1 or CC2 modules may be installed on the speaker circuit
7. For maximum wire resistance, refer to Appendix B in EST3 Installation and Service Manual (P/N 270380).
8. Synchronization of Genesis strobes is accomplished through the use of G1M, G1M-RM, SIGA-CC1S, and SIGA-MCC1S
modules. Refer to EST3 ULI/ULC Compatibility Lists (P/N 3100427).
P/N: 387463 REV: 4.0 27JUN07 Installation Sheet
2 / 3 3-ZA20A, 3-ZA20B, 3-ZA40A, 3-ZA40B - Zoned Audio Amplifiers
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