3.
Surface Mounting.
Surface mounting the SST3-MV in an NB or NBL box is accomplished using the adapter,
adapter gasket, and the #8-32 x 3-1/4" pan head screws. Use figure 2 as guide.
a. See figure 2. Insert the two #8-32 x 3-1/4" slotted pan head screws into the SST3-MV base
at opposite corners.
b. Install the adapter gasket in the adapter, and place the adapter with installed gasket over
the screws inserted in step a.
c. Secure the SST3-MV base/adapter assembly in the NB or NBL box with the pan head
screws as shown in figure 2.
4.
Concealed Conduit Mounting.
The concealed conduit mounting method is shown in the figure 3. This mounting method is
recommended when an existing junction box or handy box will not accommodate the Model
SST3-MV. In order to accomplish this type of mounting, a Federal Model NBL Outlet Box and
an adapter plate are required. A pair of 6-32 and 8-32 flat head screws are included with the
concealed mounting kit to secure the plate to the existing box. Two 10-32 x 1/4" round head
screws are supplied to attach the NBL box to the plate. An insulated bushing is also supplied
to protect electrical leads passing through the center knockout of the NBL box.
F. POWER CONNECTIONS.
Make sure that the AC power is off.
When the unit is to be operated from an AC source, set the voltage selector switch SW1 to the
desired source voltage.
CAUTION
Use only 12 to 18 AWG wire for power connection. Strip no more than 0.25-inch of wire
insulation from the ends of the power leads.
Connect the AC power leads to the 120/240VAC terminals of the four position connector plug
supplied with the unit by inserting the stripped ends of the wire into the connector as far as they
can travel. Make sure supply lead insulation is flush with connector. If stranded wire is used, be
sure that there are no loose strands outside the connector plug that could touch the adjacent lead
and cause a short circuit. Plug the connector into the receptacle provided on the printed circuit
board.
For 24VDC operation, remove the jumper and connect the positive lead to the (+) terminal and
negative lead to the (-) terminal of the four position connector as shown in figure 4.
Choose either AC or DC power operation. Do not try to operate the unit by connecting both AC
and DC power sources at the same time.
G. TONE ACTIVATION WIRING.
1.
Remote Tone Activation Connection.
Make sure that AC or 24VDC operating power to the unit is off.
The remote tone activation can be accomplished by applying a dry contact closure at J4 plug
(see figure 1) between GND terminal and one of the tone (WAIL, YELP, HORN) terminals.
Use #18AWG shielded twisted pair wires, strip no more than 0.25-inch of wire insulation from
the ends of leads to connect remotely located tone activating dry contact terminals between
GND and WAIL, YELP or HORN terminal of four position connector plug supplied with unit.
Make sure the lead insulation is flush with connector. If stranded wire is used, be sure that
there are no loose strands outside the connector plug that could touch adjacent lead and cause
a short. Plug the connector into the receptacle J4 on the printed circuit board.
The selected tone will play when unit is powered up and remote activation contacts are closed.
For proper operation of the remote activating circuit the total loop (resistance of GND wire
plus resistance of tone terminal wire plus the dry contact resistance) resistance of the circuit
should not exceed 1000 ohms.
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