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ESL 449CTE, CSTE, and 448CTE
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ESL 449CTE, CSTE,
and 448CTE
Self-Diagnostic Photoelectric
Smoke Detector
Wiring Diagrams
ESLs models 449CTE, CSTE, and 448CTE are 4-wire self-
diagnostic smoke detectors with an extra relay that provides
the added function of power supervision. NFPA standards
require power supervision for all 4-wire smoke detectors.
The supervisory relay is normally energized, and will release
with loss of power, providing power supervision, if wired
appropriately.
The supervisory relay also trips if the detectors self-
diagnotics detect an electronic failure, or if the detector is
outside the UL or ULC listed sensitivity range for more than
one day. This results in a trouble condition at the control
panel, providing early warning that the detector needs
cleaning or maintenance.
There are a number of ways the supervisory relay can be
wired into a system, depending on the type of installation.
The following are four recommended methods:
Option #1: End-of-line Applications
(No extra wires or zones)
The 449CTE, CSTE, and 448CTE take the
place of a 4-wire smoke detector and external
end-of line power supervision unit. The supervi-
sion relay is built-in and easy to wire. It also
provides an automatic trouble signal to the
control panel when the detector needs cleaning
or maintenance.
Note
The supervisory relay can only be wired in at
the end of the alarm loop. Since the relay
signals a trouble condition by breaking the loop,
any devices connected downstream would no
longer be able to signal an alarm to the control
panel.
Option #2: Class B (Style B) Wiring
(Extra wires, no extra zones)
The 449CTE, CSTE, and 448CTE can be used
for every smoke detector on a class B loop, by
running all the supervisory relay outputs to the
end of the line. This way, a trouble signal will
break the loop only at the very end, and it will
not prevent any other smoke detector from
signaling an alarm. No added power supervision
unit is needed.
DC
power
circuit
alarm
initiating
circuit
First
Detector
Last
Detector
Listed
Control
Unit
End of
Line
Device
Note
CTE and CSTE terminal block diagrams are reversed for illustration
purposes.
Models 449 and 448
CTE
Models 449CTE,
CSTE, and 448CTE
alarm power
contacts
power alarm supervisory
contacts relay
UL LISTED
449 Series
448 Series
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DC
power
circuit
Class B
initiating
circuit
First
Detector
Last
Detector
Listed
Control
Unit
End of
Line
Device
Models 449 and 448
CTE
Models 449CTE,
CSTE, and 448CTE
power alarm supervisory
contacts relay
power alarm supervisory
contacts relay
Note
CTE and CSTE terminal block diagrams are reversed for illustration
purposes. 2
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©2001 Interlogix, Inc.
Interlogix, Caddx, ESL, ITI and Sentrol are trademarks of Interlogix,Inc.
All other trademarks are properties of their respective owners.
Option #3: Class A (Style D) Wiring
(No extra wires, no extra zones)
When Class A wiring is used, the 449CTE,
CSTE, and 448CTE can be used for every
smoke detector on the loop without having to
run the supervisory wires to the end of the line.
The supervisory relay output is simply con-
nected in series with the alarm loop at every
detector. With Class A wiring, a break in the
alarm loop will not prevent other smoke
detectors from signaling an alarm, since the
loop is bi-directional. No added power supervi-
sion unit is needed.
WARNING!
Pull stations and heat detectors are not recom-
mended on the same loop when wired in this
configuration. If pull stations and heat detectors
must be used on the same loop, they must only
be wired before or after all of the CTE units.
Otherwise, if power is lost, the pull stations and
heat detectors will not signal an alarm.
Option #4: With Separate Trouble Zone
(Extra wires and extra zones)
If a separate trouble zone is available, the
449CTE, CSTE, and 448CTE can also be used
for every smoke detector on the loop. The
supervisory relay outputs are simply connected
in series with the trouble loop. No added power
supervision unit is needed.
First
Detector
Last
Detector
Listed
Control
Unit
End of Line
Device
Models 449 and 448
CTE
Models 449CTE,
CSTE, and 448CTE
power alarm supervisory
contacts relay
power alarm supervisory
contacts relay
DC
power
unit
Class A
initiating
circuit
12837 Rev B 04/02
Note
CTE and CSTE terminal block diagrams are reversed for illustration
purposes.
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First
Detector
Last
Detector
Listed
Control
Unit
End of
Line
Device
End of
Line
Device
power alarm supervisory
contacts relay
power alarm supervisory
contacts relay
Model 449CTE
Models 449CTE and
449CSTE
DC
power
circuit
fire
alarm
initiating
circuit
trouble
zone
Note
CTE and CSTE terminal block diagrams are reversed for illustration
purposes.