MEDC DB3B UL Manuel Technique page 8

4.0 OPERATION
The sounder is available in various AC and DC input voltage versions.
For AC versions, 120Vac and 240Vac units comply with regulated supply limits, for all other AC versions, the
nominal operating voltage is stated on the unit label and the supply voltage tolerance is ±10%.
For 12-48Vdc versions, the absolute input voltage range is 11.0Vdc to 58.0Vdc.
The unit is fitted with a volume control which is positioned on the top face of the electronics assembly PCB.
Maximum volume is obtained when this control is turned fully clockwise. When turned fully anti-clockwise the unit
will emit no sound. For fire alarm use, if the control is not set to maximum volume, ensure the output from the horn
meets the minimum level required by the relevant standards.
Warning: Do not attempt to turn the volume control past its limits of movement as this may cause damage to the
unit.
Directional Characteristics:
Rated SPL directional characteristics as measured in accordance with CAN/ULC-S525-07, clause 7.3.1
Long flare versions:
Nominal output @ nominal power / 3m – 112.5dB(A)
02/15
Horizontal
Point Angle
REF. 90°
P1 0°
P2 (-6dB) !1R 30°
P3 (-3dB) !2R 25°
P4 (-3dB) !2L 25°
P5 (-6dB) !1L 30°
P6 180°
Vertical
SPL dB(A) Angle
112.4 90°
92.2 0°
106.7 30°
108.9 25°
109.2 30°
106.0 40°
87.8 180°
SPL dB(A)
112.5
86.8
106.7
109.7
109.2
106.4
90.0
© MEDC 2015