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.

SNAP ON

DECORATIVE

RING

SCREWS (NOT

SUPPLIED)

DETECTOR

BASE

BOX (NOT

SUPPLIED)

SHORTING

SPRING

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.