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© 2017 United Technologies Corporation 

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P/N 1036525-EN • REV F 

 

 

 

ESL 500N Series Smoke Detector 

Installation Sheet 

 

Description 

Note: 

This document is intended for licensed electricians or 

alarm installers. We cannot provide technical support to 
unqualified persons. If you have any questions, contact us 
using the “Contact information” on page 8. 

The ESL 500N Series conventional two-wire and four-wire 
photoelectric smoke detectors have intelligent software and 
digitally processed sensing capabilities. This intelligence, 
coupled with the ESL patented optical sensing chamber, 
means the ESL 500N Series quickly and accurately detects 
smoke. CleanMe compatible software, self-diagnostics, and 
dust (drift) compensation are standard in every unit. The ESL 
500N Series offers application flexibility with optional auxiliary 
relays, rate-of-rise/fixed temperature heat sensors, isolated 
heat sensors and/or 85 dBA temporal-three sounders. 

Standard features 

All models ship standard with the features described below. 

Detector-base lock:

 Discourages unauthorized removal of the 

smoke detector by requiring a screwdriver to remove the 
detector from the base. 

Self-diagnostics:

 Includes automatic sensitivity testing. Once 

a day and immediately upon first power up, each 500N Series 
detector performs a full diagnostic test that includes a dynamic 
test of the sensing chamber and internal electronics. This 
meets NFPA 72 field sensitivity testing requirements without 
the need for external meters. 

Drift compensation (dust compensation):

 The detectors 

automatically adjust sensitivity, up to a maximum of 1.0%/ft., 
as the detectors become dirty. 

Additional features 

Depending on the model, the smoke detector may also provide 
the following features. 

CleanMe:

 Enables a CleanMe compatible control panel to 

receive a warning signal,  indicating that the optical chamber 
needs to be replaced. This feature is available on the 500N 
Series two-wire detectors only. 

The 500N Series two-wire detectors enable the CleanMe 
function by recognizing voltage polarity at installation. If the + 
and 

 terminal connections are reversed, the CleanMe function 

is enabled. New 500N Series detectors are compatible on the 
same loop with previous 500 Series detectors if proper wiring 
is observed. See “Wiring” on page 4. 

Integral temporal-three sounder:

 In the 500N models with 

sounder, a piezoelectric horn produces an interrupted 85 dBA 
tone when the detector alarms or when the polarity is reversed. 
Sounder follows input voltage in reverse polarity. 

In order for all sounders to activate when the panel alarms, the 
panel must reverse the supply voltage polarity to the loop on 
alarm. If the panel does not implement polarity reversal, an 
ESL 405 Polarity Reversal Relay Module must be used. (Refer 
to the installation sheet for the ESL 405 Polarity Reversal 
Relay Module.) 

Auxiliary and end-of-line relays:

 Auxiliary relays are Form C 

and operate at 1 A 

at 

30 VDC to allow for the addition of 

auxiliary notification devices to the smoke loops. Products with 
an “R” in the suffix signify the auxiliary relay feature. 

An end-of-line relay operates as a power supervision relay and 
is normally energized and will release with the loss of power. 
Products with an “E” in the suffix signify the end-of-line feature. 

Heat sensors:

 Some models come with rate-of-rise or fixed 

temperature heat sensors which allow the unit to detect 
changes in temperature that may signal a fire event. Models 
with an “XT” in the suffix have a heat sensor included. 

Some models are available with an isolated heat sensor. If the 
unit senses a temperature change it will alert the panel and 
signal an alarm independent of smoke in the photoelectric 
chamber. The heat alarm output is on the alarm relay and the 
smoke detector output is on the auxiliary relay. Models with an 
“H” in the suffix have an isolated heat sensor which is both rate 
of-rise and fixed temperature. 

Содержание 500N Series

Страница 1: ...r needs to be replaced This feature is available on the 500N Series two wire detectors only The 500N Series two wire detectors enable the CleanMe function by recognizing voltage polarity at installati...

Страница 2: ...etectors specified for existing construction are required and in addition a smoke detector is required in each bedroom Are more smoke detectors desirable The required number of smoke detectors might n...

Страница 3: ...on the mounting base See Figure 4 b Insert the smoke detector into the base and turn clockwise approximately 15 degrees It should snap firmly into place 7 Apply power and test the detector See Smoke...

Страница 4: ...E model wiring Note The 500N Series four wire detectors are not CleanMe compatible Model 521NB 521NBXT 521NCSXT 521NC 521NCXT CleanMe Enabled CleanMe Disabled CleanMe Disabled Two wire initiating cir...

Страница 5: ...If the error persists replace the unit 4 to 7 Unit is within normal sensitivity range N A 8 to 9 Unit is becoming too sensitive Verify that the optical chamber is snapped down securely Clean the unit...

Страница 6: ...it Unvented fire tends to build up considerable pressure Be sure all members of the household realize and understand this danger Use your neighbor s phone or a street fire alarm box to call the fire...

Страница 7: ...re 4 Four wire Product ordering Model Description Alarm current mA Reverse polarity mA 521NB Two wire photoelectric 6 5 to 20 VDC S09A 20 521NBXT Two wire photoelectric 6 5 to 20 VDC fixed temperature...

Страница 8: ...5 noncondensing Field wiring size 12 to 24 AWG 16 to 22 AWG recommended Electrical boxes Fits standard single gang and 3 1 2 in and 4 in round ceiling electrical boxes Heat detector Rate of rise Fixed...

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