
• Remote control capability
• Easi-Fit base
• Tamper proof rechargeable lithium battery back up
• High performance optical chamber with integral
insect screen
• Test/Hush button
• Advanced suppression and calibration technology
• Interconnectable to other Ei mains powered alarms
• Built in auto self test feature
• Low power cell warning
• Kitemarked to BS5446-1:2000
• 5 year guarantee
Product Description
The Ei166R is an Optical Smoke Alarm that runs on
230V AC mains power, and has built in tamper proof
rechargeable lithium cells that act as a battery back up in
the event of mains failure. These rechargeable lithium
cells are designed to have a ten year life and outlast the
life of the smoke alarm itself, whilst providing up to six
months of smoke alarm operation without mains power.
The Ei166R is supplied with the Easi-Fit base that allows
very quick and simple installation of the smoke alarm,
combined with simple detector head removal and
replacement. The Easi-Fit base automatically connects
both mains power and battery as the detector head
slides on to the Easi-Fit base.
The Ei166R allows the detector to be controlled remotely
by either a “Test/Hush” Switch (Ei152), a “Locate” Switch
(Ei159) or a Manual Call Point (MCP400). If the Ei166R
is also interconnected to other Ei mains powered alarms
then the whole system can be controlled remotely.
The Ei166R has other advanced features such as
integral insect screens to reduce the chances of false
alarms, as well as the ability to interconnect up to twelve
alarms.
The Ei166R has built in circuitry to aid suppression of
voltage transients and RF interference to further reduce
Operation
• The green indicator will illuminate to show mains
power is present
• The red indicator will flash every 40 seconds to
show that the detector has performed an automatic
self test
• The red indicator will flash rapidly to show an alarm
condition for the smoke detector
• The “Test/Hush” button will either silence false
alarms or perform a unit self test
• In “Test” mode the alarm will perform a self test and
sound the horn
• In “Hush” mode the alarm enters a ten minute period
of reduced sensitivity to overcome false alarm
conditions, and will then automatically reset itself
• When interconnected to other Ei mains powered
alarms, an alarm on one detector will trigger all other
interconnected alarms within one second (only the
triggered alarm will flash a red indicator)
• The smoke detector will emit a beep and flash the
red light every 40 seconds to indicate that the
battery back up is depleted and needs recharging
MAINS POWERED 230V~
Rechargeable Battery Back-Up
Shannon Free Zone, Shannon, Co. Clare, Ireland.
Ph.+353 61 471277 Fx.+353 61 471053
Email. eielectronics@eiltd.ie
www.eielectronics.com

Installation & Placement
Wiring for Interconnected Alarms
Be very careful about correctly wiring the alarms as mixing Live and Neutral
will blow/damage interconnected alarms.
Alarms should be placed in accordance with the general guidelines shown in
the diagram above. These recommendations are based on the problem of
areas of “dead air” close to corners of rooms and apexes of ceilings, which
could result in the prevention of smoke reaching the smoke detector
Please consult instruction booklet for specific installation details
Important Precaution:
Do not install the actual smoke/heat alarm
itself in new or renovated buildings until all
work is completed (including floor
coverings) and the building has been fully
cleaned. The wiring can be installed when
appropriate. (Excessive dust and debris
from building work can contaminate the
smoke chamber and cause problems, and
it will also invalidate the guarantee). If it
must be installed, cover it completely,
particularly around the edges, with a dust
cover (eg. a plastic bag), until all cleaning
is finished.. Connect wires to the unit as in
wiring diagram. All wiring must comply
with local codes.
Technical Specification
Sensor Optical, uses light scatter from
smoke
Sensitivity: Complies with BS 5446 Part 1:
2000
Source: Contains no radioactive material
Airspeed: Essentially immune to the effect
of airspeed.
Button Test: Simulates the effect of smoke and
checks chamber, electronics and
horn.
Ambient Light: Chamber housing design and
compensation overcomes
problems with stray light.
Automatic Self-Test: Smoke Chamber is tested every 40
Sec. and unit beeps (without LED
flash) if it is degraded.
Insect Screen: Prevents insects or debris entering
chamber (1.00mm mesh size)
Supply Voltage: 240V AC
Battery back up: Rechargeable lithium cells
Power-On Indicator: Continuous green LED
Alarm: Electronic Piezoelectric horn
Alarm Sound Output: 85dB (minimum) at 3m
Alarm Status: Red LED flashes every second on
unit sensing fire
Temperature Range: 0 to 40°C
Humidity Range: 15% to 95% Relative Humidity
Remote Control: Ei152, Ei159 or MCP400
Interconnect: Up to 12 interconnected
EI140/141/143/144/145/146/161/1
64/166 smoke or heat alarms,
along with an EI128 relay base
Fixing: Easi-Fit mounting base
Plastic material: UL94VO flame retardant
Dimensions: 152mm diameter x 50mm depth
Weight: 385g
Warranty: 5 year (limited) warranty
Approvals: Kitemarked to BS5446-1:2000, CE
Approved
Shannon Free Zone, Shannon, Co. Clare, Ireland.
Ph.+353 61 471277 Fx.+353 61 471053
Email. eielectronics@eiltd.ie
www.eielectronics.com