Duct Smoke Detector Sampling Tube Installation

Duct smoke detector a.

Duct smoke detector sampling tube installation.

The sampling tube should be angled at least 1 4 downward for every 12 of duct width per figure 4. The end cap is needed to cre ate the proper air flow to the sensor of the duct smoke detector. Locate the sensor 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. Air is introduced to the duct smoke detector s sensing chamber through a sampling tube that ext ends into the hvac duct and is directed back into the ventilation system through an exhaust tube.

Sampling tubes install from front and rear compatible with existing accessories able to address detector per code switches on sensor head. 3 contents of the duct smoke detector kit 1. Use 4 mounting screws 4 12 x 1 2 sheet metal screws packaged in installation kit to secure the housing to the air duct. The difference in air pressure between the two tubes pulls the sampled air through the sensing chamber.

Drill a 3 4inch hole in the duct opposite the hole already cut for the sampling tube. Ensure that the sampling tube is angled downward from the duct smoke detector to allow for moisture drainage away from the detector. The sampling tube should be angled at least 1 4 downward for every 12 of duct width per figure 4. Once any sampling tube length adjustments are made plug the end of the sampling tube with the provided end cap.

Move duct housing sampling tube assembly to desired location. To ensure correct operation install the superduct duct smoke detector using the following guidelines. The sampling tube end cap included with the detector is critical to proper operation of the duct smoke detector. Sampling tube connectors are equipped with set screws which allow the tubes to be mounted only in directions shown in figure 2.

Three 10 sheet metal screws for mounting 3. Sensor power board assembly and covers sensor head is factory installed 2. Ensure that the sampling tube is angled downward from the duct smoke detector to allow for moisture drainage away from the detector. See figure 12 for sensor and controller dimensions.

Drilling template 4.