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GS-2AQD
Indoor Air Quality Sensor
Product Description
This document describes the hardware installation procedures for the GS-2AQD Indoor Air Quality Sensor.
The Indoor Air Quality Sensor uses an advanced MEMS metal oxide semiconductor sensor to detect poor air quality. The sensor reacts quickly to detect
a broad range of VOCs such as smoke, cooking odors, bio-effluence, outdoor pollutants and from human activities. The sensor captures all VOC emissions
that are completely invisible to CO
General Installation Requirements
For proper installation and subsequent operation of each device, pay special attention to the following recommendations:
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Upon unpacking the product, inspect the contents of the carton for shipping damages. Do not install damaged device.
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Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
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Ensure that all equipment is installed according to local, regional, and national regulations.
Personal injury or loss of life may occur if you do not follow a procedure as specified.
Equipment damage or loss of data may occur if you do not follow a procedure as specified.
Take reasonable precautions to prevent electrostatic discharges to the controller when installing, servicing or operating
the controller. Discharge accumulated static electricity by touching one's hand to a well-grounded object before working
with the controller.
Mounting Instructions
The duct type sensor installs on the outside of a return air duct with the sampling tube inserted into the duct. Mount the sensor in an easily accessible
location in a straight section of duct at least five feet from corners and other items that may cause disturbances in the air flow. Avoid areas with vibrations
or rapid temperature changes.
Figure 1: GS-2AQD Indoor Air Quality Sensor
sensors.
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H a r d w a r e I n s t a l l a t i o n G u i d e
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Summary of Contents for Distech Controls GS-2AQD
- Page 1 Product Description This document describes the hardware installation procedures for the GS-2AQD Indoor Air Quality Sensor. The Indoor Air Quality Sensor uses an advanced MEMS metal oxide semiconductor sensor to detect poor air quality. The sensor reacts quickly to detect a broad range of VOCs such as smoke, cooking odors, bio-effluence, outdoor pollutants and from human activities.
- Page 2 The duct sensor principal of operation is based on the Venturi effect of the probe that extends into the HVAC duct. Air flowing through the duct is forced into the vent holes on one side of the probe, over the air quality sensor and then is drawn back out of the probe vent holes on the opposite side. Drill or punch a 7/8”...
- Page 3 Figure 5: Tighten security screws.
- Page 4 Wiring Deactivate the 24 Vac/dc power supply until all connections are made to the device to prevent electrical shock or equipment damage. Follow proper electrostatic discharge (ESD) handling procedures when installing the device or equipment damage may occur. Use 18 - 22 AWG shielded wiring for all connections and do not locate the device wires in the same conduit with wiring used to supply inductive loads such as motors.
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Page 5: Operation
Figure 9: Relay output. Resistive Temperature Sensor An optional resistive temperature sensor may also be included in the device and is connected to the TEMP terminals as shown in Figure 10. Various thermistors or RTDs may be installed on the PCB to suit the application. These terminals would connect to a thermistor or RTD sensor input on the controller. - Page 6 Table 2: ASO operation. The normally open relay will close when the air quality exceeds a pre-set trip point. The trip point and hysteresis value can be programmed via the menu such that the relay closes when IAQ > Relay Setpoint and opens when IAQ < Relay Setpoint - Hysteresis. By default, the relay has a one minute minimum on and off time to prevent short cycling.
- Page 7 5. ASO Good Output This sets the ASO output voltage for the Good range. It can be set using <UP> or <DOWN> anywhere Good from 0-10 Vdc. Resolution is 0.1 Vdc. The value is shown on the LCD and the ASO output changes accordingly.
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Page 8: Specifications
Specifications Sensing Technology MEMS metal oxide semiconductor VOC sensor Measurement Range 450-2000 ppm CO2 equivalent or 0-100% (menu selectable) Drift Compensation Automatic baseline correction Power Supply 20-28 Vac/dc (non-isolated half-wave rectified) Consumption 35 mA max @ 24 Vdc Input Voltage Effect Negligible over specified operating range Protection Circuitry Reverse voltage protected, over voltage protected... - Page 9 ©, Distech Controls Inc. 2019 All rights reserved. While all efforts have been made to verify the accuracy of information in this manual, Distech Controls is not responsible for damages or claims arising from the use of this manual. Persons using this manual are assumed to be trained HVAC specialist / installers and are responsible for using the correct wiring procedures and maintaining safe working conditions with fail-safe environments.
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