2
ESL 700 Series
Testing the Wiring for Continuity
After all universal mounting bases are installed, including the end-of-line
device, check the system wiring for continuity. Verify that the manually
operated continuity switch in each base is in the shorting position —
making contact with terminals 1 and 2 (for use at initial installation
only). Use a screwdriver to reset any unshorted continuity switches (reset
by prying the jumper wire out of the plastic stopper). This establishes
continuity across the alarm initiating circuit at initial installation. The
wiring can now be tested for continuity using an ohmmeter or “megger.”
Installing the Detector Head
Base models 702RE and 702RU have a special plastic protrusion built in to
prevent insertion of the wrong heads. They are designed specifically for use
with only 731U heads, which include auxiliary relay contacts, and are only
required when high voltage (i.e. 120 VAC) is connected to the auxiliary
relay. This prevents the installer from inserting a low voltage detector head
into a base containing damaging high voltages. Standard base models 702E
and 702U can be used with the 731U heads when 120 VAC is not present.
Every 700 Series base includes a continuity switch which shorts terminals
1 and 2 together for easy continuity testing. When a 700 Series head is
inserted, the continuity switch will be snapped back, out of the way, and
will no longer short terminals 1 and 2. The continuity switch can be
snapped back into its original position with a screwdriver, if necessary.
To install a detector head, insert the head and rotate it clockwise until it is
properly aligned and “sets” into the base (see Figure 6). Then rotate it an
additional 15 degrees to lock it in place. This action will automatically
“open” the continuity switch in the base and allow continuity in the
system to be established by the detector heads.
Removing the Detector Head
To remove the detector head turn it counterclockwise. However, if the
locking tab slot has been removed, insert a small screwdriver into the
locking tab slot on the side of the base and press in while simultaneously
turning the detector head counterclockwise (see Figure 7). When a
detector head is removed for cleaning or repair, continuity in the system is
broken. Continuity can be re-established by manually resetting the
continuity switch on the empty base with a screwdriver.
Consider the Locking Mechanism BEFORE Installation
Each detector head is equipped with a breakaway locking tab slot to prevent
unauthorized removal of the detector head (see Figure 3). For installations
where unauthorized removal of the detector head is not a concern, the head
can be removed by simply turning counterclockwise.
However, when the head must lock to the base, break away the locking tab
slot with a pair of pliers. Then, to remove the detector head, insert a small
screwdriver into the slot on the side of the base and press in while
simultaneously turning the detector head counterclockwise (see Figure 7).
Installing the Universal Base
The 701U and 702U 6-inch diameter universal mounting bases mount
directly to standard single-gang electrical boxes, 4-inch square, round, or
octagonal boxes, 3.5-inch octagonal boxes, and to WIREMOLD Nos.
5738A or 5739 fixture boxes. The 702E 4-inch diameter universal
mounting bases mount only to 3-inch round electrical boxes. Bases may
also be mounted without electrical boxes if approved by the AHJ or if
codes allow.
The 6-inch diameter bases have two parts; the base itself that mounts to
the electrical box or ceiling, and the base cover that conceals the
mounting screws (see Figure 4). The 6-inch diameter bases are shipped
loosely coupled to the base cover.
1. Mount the base. Align the molded line on the base with the base cover,
and twist clockwise to snap in place. To remove the base cover, simply
twist counter-clockwise to unsnap (see Figure 4).
2. Pull wire through the electrical box, then through the center opening
of the 700 Series universal base. Connect the wire to the appropriate
terminals according to the wiring diagrams (see Figure 1). Each base is
equipped with either three or six clamping type wire terminals and
bifurcated contact springs for contact with detector head circuit pins.
Each wire clamping terminal will accommodate two conductors up to
2.0 mm in diameter (#12 AWG).
3. Dress the wiring neatly and verify that the continuity switch (jumper
wire) is touching both terminal 1 and terminal 2. Securely fasten base
with appropriate hardware (see Figure 5).
CHECK ALL WIRING AND MOUNTING CONNECTIONS.
End-of-Line Supervision for Four-Wire Systems
NFPA 72 requires power wiring in four-wire systems to be supervised. This is
accomplished by installing a power supervision unit for the appropriate
control unit voltage at the end of the detector power circuit. ESL model
204–12/24 V power supervision relay—is recommended for both 12 VDC or
24 VDC operation. See 204–12/24 V installation instructions for more
information.
Figure 2. Fire sensor placement
4 in. (100mm)
minimum
4 in. (100mm)
minimum
12 in.
(300mm)
maximum
ceiling
acceptable here
never here
top of detector
acceptable here
side
wall
Figure 4. The 6" diameter mounting base
Screwdriver slot to
unlock head
Base
Base cover
Align the molded lines on
the base and cover, then
twist to snap into place
.
Figure 3. Removing the locking tab slot
To lock, break out tab with pliars
firealarmresources.com
