D150-03-00 2 I56-597-03R
Installation Guidelines
NOTE: Refer to the releasing device manufacturer’s
instructions for connection instructions.
Allowable loop resistance is an important specification for
control panels as well as for smoke detectors and their
bases. The alarm system cannot be expected to operate cor-
rectly if system components have incompatible allowable
loop resistances. Therefore, before beginning installation,
refer to the control panel manufacturer’s loop resistance
specification to ensure that it is listed as compatible with
the System Sensor base and smoke detector being installed.
All wiring must be installed in compliance with the
National Electrical Code, all applicable local codes and any
special requirements of the authority having jurisdiction,
using the proper wire size. The conductors used to connect
smoke detectors to control panels and accessory devices
should be color-coded to reduce the likelihood of wiring
errors. Improper connections can prevent a system from
responding properly in the event of a fire.
Wiring
For signal wiring (the wiring between interconnected
detectors), it is recommended that the wire be no smaller
than AWG 18. However, the screws and clamping plate in
the base can accommodate wire sizes up to AWG 12. The
use of twisted pair wiring for the power (+ and -) loop is
recommended to minimize the effects of electrical interfer-
ence.
NOTE: To ensure that electrical connections are super-
vised, DO NOT loop wires under terminals 2, 3,
and 5 –break the wire at each terminal.
To make electrical connections, strip approximately 3/8" (1
cm) insulation from the end of each wire. Slide the wires
under the clamp plate and tighten the terminal screw.
If the base is being installed in a zoned system, check the
zone wiring before installing the smoke detector head. The
built-in shorting spring makes it convenient to do this.
After the detector base is wired and attached to the electri-
cal box, position the shorting spring against terminal 3. Use
the slot in the retaining clip to hold the spring against the
terminal, as shown in Figure 1. This shorts the negative-in
and negative-out leads so that loop wiring can be tested for
continuity.
The shorting spring in the base will disengage automatical-
ly when the detector head is removed from the base. DO
NOT remove the shorting spring since it reengages as the
detector head is turned into the base, completing the cir-
cuit.
A78-1175-01
Figure 1. Mounting base to box:
Tamper-resistance Feature
NOTE: DO NOT use the tamper-resistance feature if the
System Sensor XR2 Removal Tool will be used to
remove detectors from the base.
This detector base can be made tamper resistant so the
detector cannot be removed without the use of a tool. To
make the base tamper-resistant, break off the smaller tab at
the scribed line on the tamper-resistance tab, on the detec-
tor mounting bracket (see Figure 3A), before installing the
detector.
To remove the detector from the base after it has been
made tamper resistant, remove the decorative ring by rotat-
ing it in either direction and pulling it away from the base.
Then, insert a small screwdriver into the notch, as indicat-
ed in figure 3B, and press the plastic lever toward the
mounting surface before rotating the detector counter-
clockwise for removal.
(4 pages)
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