20W 12VDC 100VRMS Line Amplifier
20W 12VDC 100VRMS Line Amplifier
Head Office
PO Box 35-063
Naenae, 5011
Lower Hutt
17 Eastern Hutt Rd
Lower Hutt 5019
Tel (04) 567-3229
Fax (04) 567-3644
Auckland Office
Product Overview:
The Pertronic 20W Amplifier (EVAC20W12V) is an evacuation amplifier with integral evacuation tone and
message generator, together with a fault detection system. It is designed for use in emergency warning
systems with supervised 100 Volt Line distribution systems. The amplifier delivers up to 20 Watts of audio
power to the 100 Volt line.
The EVAC20W12V generates an evacuation tone with a voice message as specified in NZS 4512:2010.
The amplifier is controlled by the BELL output of a fire alarm panel such as the Pertronic F1 or F4.
When in standby, the 100 Volt line is connected to the BELL circuit. This allows the fire alarm panel to
detect short or open circuit faults on the 100 Volt line. The BELL circuit drives a small dc current through
the 100 Volt line, which must be terminated with a suitable end of line resistor. It is important to note that
every speaker connected to the supervised 100 Volt Line must be specially designed for emergency
warning systems, with each speaker incorporating a DC blocking capacitor.
Generates the ‘Evacuation’ tone with verbal messages
as specified by NZS 4512:2010
Can be directly mounted into the Pertronic F1 or F4
Conventional Fire Alarm panels, but can be used with
any 12 V Fire Alarm system
Activated when the BELL circuit voltage polarity
reverses to the ‘Alarm’ state
In the ‘Normal’ state, the amplifier draws practically no
current (less than 0.2 µA) and appears transparent to
the Fire Alarm panel
The 100 Vrms line is internally connected to, and
monitored by the panel’s BELL circuit
The amplifier’s 100 Vrms line is short-circuit protected
and is capable of driving up to 20 W (13.7 Vdc supply)
into connected PA loud speakers, eg. Pertronic PSS1
and PSSB401
PO Box 15-867
New Lynn
Auckland 0640
359 Onehunga Mall Specifications:
Auckland 1061
Tel (09) 633-0226
Fax (09) 633-0228
Power Output
Board Dimensions
Operating Voltage
9.6 to 14.4 Vdc
Reference 13.7 Vdc
Pertronic 20W, 12V Amplifier
Quiescent Current
0.2 µA @ 12 Vdc
20 Wrms @ 100 V line : 13.7 Vdc Supply
15 Wrms @ 100 V line : 10.5 Vdc Supply
Operating Temperature Range
0 to 30 C
100 x 70 x 47 (L x W x D mm)
Alarm Current
2.0 A @ 13.7 Vdc
- with 20 Wrms load
10 to 95 % RH (non-condensing)
300 g
Monitored for open and short-circuit (10 kΩ, 2 W EOL resistor)
Evacuation tone and verbal message, compliant to NZS 4512:2010
NZS 4512:2010 Tone Characteristics:
Certificate No:
Product Code
EVAC Amplifier, 20W 12V, SMD version
Pert Sounder Speaker 1W Flush - Red
Pert Sounder Speaker 1W Flush – White
Pertronic Speaker with B401 Base
0322 EVAC20W12V Pertronic 20W, 12V Amplifier Iss 2.6 20161017
The Amplifier is connected to the Fire Alarm panel sounder circuit output. The BELL terminals ‘+’ and ‘-’ are connected to the
corresponding ‘+’ and ‘-’ terminals on the amplifier.
In the ‘Normal’ state, the panel monitors the 100 V line EOL (10 kΩ, 2 W) resistor by applying an inverted voltage to the amplifier
input terminals. In this state the amplifier connects the EOL resistor to the panel BELL output. A 10 kΩ, 2 W EOL resistor must be
used across the 100 Vrms line for correct operation of the amplifier monitoring circuit.
In the ‘Alarm’ state, the Fire Alarm panel reverses the Sounder voltage causing the amplifier to activate and output a repeating
‘Evacuation Tone followed by a voiced Evacuation Message’ onto the 100 Vrms loudspeaker circuit. The amplifier is NOT monitored
during the ‘Alarm’ state.
If the amplifier output is overloaded, or the supply voltage becomes ‘Off-Normal’, the amplifier will signal a defect by turning the
Defect LED ON (refer to Table 1)
Defect LED
Defect Description
Amplifier inactive
Amplifier active
1 flash is long
Supply Voltage is out of range
flash is long
Input current is too high
3 flash is long
Output voltage too low, short detected
Table 1: LED Decoding
The 100 Vrms Line may have a maximum of three spurs. For these configurations an EOL resistor of the appropriate value must be
installed at the end of each spur (refer to Table 2).
Number of Spurs
EOL Resistor Value for Each Spur
1 x 10 kΩ, 2 W
1 x 22 kΩ, 1 W on each spur
1 x 33 kΩ, 1 W on each spur
Table 2: Spurs
Capacitively-coupled 100 Vrms PA Speakers must be used with the 20W Amplifier. The capacitor must be bipolar and able to
withstand 250 V peak line voltage. The value should be approximately 1 µF per watt of power for each speaker.
The 100 Vrms speaker wiring must be separated from other wiring to prevent interference from cross-talk.
Loading of the 100 Vrms line must not exceed 20W.
An excessive load will cause the Amplifier to current limit and shutdown. The symptoms for this may be interruptions in the audio
output and two or more amplifiers broadcasting out of synchronization.
Loading of the Bell output must not exceed the maximum fuse or relay ratings.
F1 Panel Bell Circuit: Fuse 1 = 3 A
F4 Panel Bell Circuit: Fuse 1 = 5 A
12 V, 20 W Amplifier Line Relay maximum contact current = 3 A
Connection Diagram:
Head Office:
17 Eastern Hutt Rd, Wingate, Lower Hutt 5019
Telephone (04) 567-3229 Fax (04) 567-3644
Auckland Office:
59 Onehunga Mall, Onehunga, Auckland 1061
Telephone (09) 633-0226 Fax (09) 633-0228
‘Pertronic’ and ‘Firetronix’ are registered trademarks of Pertronic Industries Ltd
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