Technical Bulletin
6
SuperDuct Four-Wire Duct Smoke Detector
The controls and indicators on the duct smoke sensor
controller (see Figure 4) are as follows:
Control or indicator Description
Reset switch
Resets the sensor when it is in the
alarm or trouble state. Activates or
tests the sensor when it is in the
normal state.
Alarm LED
Indicates one or both sensors are in
the alarm state
Trouble LED
Indicates one or both sensors are in
the trouble state (flashing = dirty
fault, steady = internal or wiring fault)
Power LED
Indicates the controller is energized
Duct smoke sensor
Magnetic
test/reset
switch
Alarm
Trouble
Power
Dirty
Figure 5: Sensor assembly controls and indicators
The controls and indicators on the duct smoke sensor (see
Figure 5) are as follows:
Control or indicator Description
Magnetic test/reset
switch
Resets the sensor when it is in the
alarm or trouble state. Activates or
tests the sensor when it is in the
normal state.
Alarm LED
Indicates the sensor is in the alarm
state
Trouble LED
Indicates the sensor is in the trouble
state
Dirty LED
Indicates the amount of
environmental compensation used
by the sensor (flashing continuously
= 100%)
Power LED
Indicates the sensor is energized
Normal state
The SuperDuct duct smoke detector operates in the normal
state in the absence of any trouble conditions and when its
sensing chamber is free of smoke. In the normal state, the
Power LED on both the sensor and the controller are on and
all other LEDs are off.
Alarm state
The SuperDuct duct smoke detector enters the alarm state
when the amount of smoke particulate in the sensor’s sensing
chamber exceeds the alarm threshold value. Upon entering the
alarm state:
•
The sensor’s Alarm LED and the controller’s Alarm LED
turn on
•
The contacts on the controller’s two auxiliary relays
switch positions
•
The contacts on the controller’s alarm initiation relay
close
•
The controller’s remote alarm LED output is activated
(turned on)
•
The controller’s high impedance multiple fan shutdown
control line is pulled to ground
Trouble state
The SuperDuct duct smoke detector enters the trouble state
under the following conditions:
•
A sensor’s cover is removed and 20 minutes pass before it
is properly secured
•
A sensor’s environmental compensation limit is reached
(100% dirty)
•
A wiring fault between a sensor and the controller is
detected
•
An internal sensor fault is detected
Upon entering the trouble state:
•
The contacts on the controller’s supervisory relay switch
positions
•
If a sensor trouble, the sensor’s Trouble LED the
controller’s Trouble LED turn on
•
If 100% dirty, the sensor’s Dirty LED turns on and the
controller’s Trouble LED flashes continuously
•
If a wiring fault between a sensor and the controller, the
controller’s Trouble LED turns on but not the sensor’s
Note:
All troubles are latched by the duct smoke detector. You
must clear the trouble condition then reset the duct smoke
detector in order to restore it to the normal state.
