D900-04-00
2
I56-712-03
Note
:
All models can be powered using full wave recti-
fied unfiltered supplies. Under no circumstances
can RK24ADA series devices input voltage exceed
33 VDC or be less than 16 VDC (16-33Vrms for full-
wave rectified, unfiltered supplies).
There may be applications where it is desirable to drive the
sounder and strobe as independent devices. The System
Sensor MASS12/24ADA series sounder/strobes are easily
configured for this capability. The terminal connection for
this application is shown in Figure 2. Independent strobe
operation in a coded system requires a separate uncoded
power supply for the strobe.
Installation - For Strobe Placement, See NFPA 72,
Chapter 6
General
Retrofitting should not be performed when boxes have
plaster rings mounted on the front of them.
Notes:
Do not loop wires under the terminal
screw. Wires connecting the device to the
panel must be broken at the device termi-
nal connection in order to maintain elec
trical supervision.
Strobe and strobe/horn combination are designed for
wall mounting ONLY.
The sounder is 1-1/4
"
deep. Back boxes must be 4
"
square
by at least 1-1/2
"
deep – 2-1/8
"
deep is recommended.
All strobes must be mounted so that the top of the lens is
24 inches (61 cm) below ceilings or as required by the au-
thority having jurisdiction.
Mounting Location (per NFPA 72)
Sleeping:
110 cd if bottom of appliance is greater than 24"
below the ceiling, 177 cd if the bottom of the appliance is
less than 24" below the ceiling.
Nonsleeping:
Bottom of the strobe not less than 80" above
the floor and not more than 96" above the floor.
A. Horn Preparation (Existing Multi-Alert™ Installations
Only).
1. Remove the unit from its current mounting.
2. Remove the existing strobe, if it is present. Discon-
nect the interconnecting wires.
3. On Model MA12/24D (no strobe), use a screwdriver
to punch the flashed over slots.
B. Sounder/Strobe combination mounting:
1. a. Surface Mount: (see Figure 4).
b. Semiflush Mount (see Figures 5 and 7).
c. Flush Mount (see Figure 6).
2. Slide one Supervisory PC Board over each terminal
lug until it is fully seated.
3. a) See Figure 2 for strobe and sounder operating inde-
pendently.
b) See Figure 3 for strobe and sounder operating in
tandem.
Flush mounting requires the use of the deep box (Part #
BB-D) or equivalent. Determine which of the two device
holes will be used to attach the device to the box. Mount
the flush plate to the sounder using the other two holes
with two 1-inch phillips head screws and two square
nuts.
Installation procedures must conform to all applicable
codes and the requirements of the authority having juris-
diction.
NOTE:
The rated output of the sounder is specified at 10
feet. It cannot be assumed that the output will
meet the NFPA standard of 15 dB over ambient
noise at all locations within a room. Additional
sounders may be needed to ensure sound output
level complies with NFPA standards.
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