Technical Bulletin
4
SuperDuct Signature Duct Smoke Detector
Operation
Controls and indicators
Magnetic
test switch
Alarm
Power
Figure 3: Duct smoke detector controls and indicators
The controls and indicators on the duct smoke detector (see
Figure 3) are as follows:
Control or indicator Description
Magnetic test switch
Activates (alarms) the detector when it
is in the normal state. The switch is
inoperative when the detector is in the
trouble state.
Alarm LED
Indicates the detector is in the alarm
state as follows:
Flashes at a continuous rate if the first
detector in alarm
Flashes intermittently if not the first
detector in alarm
Power LED
Off when the detector is in the alarm
state
Flashes intermittently when the
detector is in the normal state
Notes
1. The intermittent flash indicates each time the control panel
polls the detector
2. Both LEDs are on continuously when the detector is in alarm
and in the standalone mode.
Normal state
The duct smoke detector operates in the normal state in the
absence of any trouble conditions and when its sensing
chamber is free of smoke.
Alarm state
The duct smoke detector enters the alarm state (is activated)
when the amount of smoke in its sensing chamber exceeds its
alarm threshold setting or when an alarm test is initiated. Upon
entering the alarm state, the duct smoke detector’s:
•
Alarm LED turns on
•
Common alarm relay contacts switch positions
•
Remote alarm LED output turns on (is activated)
In addition, the duct smoke detector generates an alarm or
supervisory event message depending on the device type with
which it is configured.
Trouble state
The duct smoke detector enters the trouble state under the
following conditions:
•
Its cover is removed and 20 minutes pass before it is
properly secured
•
Its environmental compensation limit is reached
•
The detector is 100% dirty
•
An internal detector fault is present
Upon entering the trouble state, the duct smoke detector
generates an event message based on the type of trouble
encountered.
Note:
All troubles are latched by the duct smoke detector. You
must clear the trouble condition then reset the control panel in
order to restore the detector to its normal state.
Installation
Installation guidelines
To ensure correct operation, install the duct detector using the
following guidelines:
•
Locate the detector so its sampling tube is positioned in a
straight length of square duct between six and ten duct
widths from any bends or obstructions as shown in the
diagram below. See Figure 7 for detector dimensions.
