Control equipment
Installation and maintenance instruction
Control equipment
Optical smoke detector for duct installation,
UG-3-O for measurement of smoke
in ventilation ducts
High level of venturi
Automatic sensitivity adjustment
Test hole on cover
Sensitive flow indicator
Installation-friendly terminal block
Foolproof pipe mounting, can not be fitted incorrectly
Complete with pre-assembled cable entries
Service alarm
Sensor with bayonet
optimal function during the whole life time of the detector.
When the controlling circuit can no longer compensate for
contamination, a service alarm is indicated.
The product consists of a smoke detector and an adapter
system for optimal airflow.
The system fulfills all the requirements for safe fire
detection with airflow speeds from 0,2 m/s to 20 m/s.
The detector has 4 premounted IP67 approved cable
entries with built-in cable anchorage for diameter 4-11
mm, type Klikseal.
The smoke detector is used together with a control unit;
e.g. ABAV-S3 to control fire-safety dampers, to stop
ventilation fans, and to activate acoustic and optical
alarms etc.
Basic principles for positioning
For the airflow through the adaptor to be representative
of the airflow in the ventilation duct, install the detector at a place where normally flow meters etc. should be
mounted, please see our installation instructions.
A contaminated detector will result in increased sensitivity and false alarms. To avoid nuisance alarms the
detector has a service alarm (green LED). This indicates
that the detector should be exchanged or cleaned.
The smoke detector is supplied with 0,6 m venturi. When
the ventilation duct wider than 0,6 m (dia), the venturi pipe
should penetrate the whole duct.
The detector UG-3-O contains an intelligent controlling
circuit. This circuit is adjusting the sensitivity to give an
Drill a hole
Ø 38 mm.
Drill a hole
Ø 38 mm.
Max diameter of the duct 0,6 m.
Use the venturi pipe 0,6 m.
Shorten the pipe, if necessary.
Diameter of the duct bigger
than 0,6 m.
The venturi pipe should
penetrate the whole duct.
Shorten the pipe to correct length.
Insert the end plug.
Put on the end plastic
Put on the rubber
gasket, TET 26-35.
For ducts with a ø of less than 0,6 m use the 0,6 m pipe.
For ducts with a ø of between 0,6 m and 1,4 m use the 1,5 m pipe.
For ducts which are larger than 1,4 m use the 2,8 m pipe.
Drill a hole
Ø 51 mm.
The venturi pipe shall not
protrude more than 30 mm
through the duct wall.
Fläkt Woods
8813 GB 2011.10
Subject to alteration
Installation and maintenance instruction
Control equipment
Technical data
Function test
Detector type:
Operating Voltage Detector:
Operating current:
Service alarm current:
Fire alarm current:
Operating temperature:
Maximum humidity:
Tested and approved:
LED on smoke detector:
~ 0,04 mA
~ 13 mA
~ 50 mA
-20°C to +50°C
99% rH
Yellow - service alarm
Red - smoke alarm
Adaptor housing:
Air sampling pipe:
When installation is complete, the detector should be
tested. This can be carried out with smoke or suitable testspray, for example RDP-300, using the test hole on cover.
Do not forget to refit the plastic plug after test.
NOTE! When installing outdoors or in cold attics etc.,
where there is a risk for condensation, this requires
that the detector is insulated from the surrounding
air by means of for example our waterproof housing
UG-COVER, and marked with an extra indicator lamp,
LED-03 and a sign marked ”Hidden Detector”.
Detector according to EN-54, VdS
Green - service alarm
Red - smoke alarm
Venturi effect
The slots alongside the venturi pipe, for the inlet and the
outlet of the venturi air stream, gives maximum air flow
and make the venturi pipe self-adjusting with a stable
and uniform flow from the whole cross section of the
ventilation duct
Wiring diagram
The venturi pipe is made of aluminium and can easily be
shortened to suit the diameter of the duct. Hole diameter
is 38 mm. With insulated or circular ducts - use the mounting bracket, hole diameter is then 51 mm.
When the detector becomes contaminated, sensitivity is
increased, triggering the service alarm. This can be avoided for a considerable time by cleaning the detector once
a year with a vacuum cleaner.
2,2 kohm
Air flow monitoring
The detector is fitted with a red plastic switch tongue.
When the detector is correctly installed, the tongue is
bent outwards by the air flow. The switch tongue provides a simple confirmation that there is no leakage and
that the air flow from the duct is in fact flowing through
the housing.
Dimensions (mm)
Fläkt Woods
8813 GB 2011.10
Subject to alteration
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