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GS-2CDD20K Series
Carbon Dioxide Transmitter
Product Description
This document describes the hardware installation procedures for the GS-2CDD20K Series duct carbon dioxide gas detectors.
The GS-2CDD20K CO2 transmitter uses Infrared Technology to monitor CO2 levels up to 20,000 ppm and outputs a linear 4-20 mA
or 0-5/0-10 Vdc signal. Options include a control relay and a resistive temperature sensor. Features include a back-lit LCD and a user
menu for easy installation.
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.
Do not use in an explosive or hazardous environment, with combustible or flammable gases, as a safety or emergency
stop device or in any other application where failure of the product could result in personal injury.
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.
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
Figure 1: GS-2CDD20K Carbon Dioxide Transmitter
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Summary of Contents for Distech Controls GS-2CDD20K Series
- Page 1 Figure 1: GS-2CDD20K Carbon Dioxide Transmitter Product Description This document describes the hardware installation procedures for the GS-2CDD20K Series duct carbon dioxide gas detectors. The GS-2CDD20K CO2 transmitter uses Infrared Technology to monitor CO2 levels up to 20,000 ppm and outputs a linear 4-20 mA or 0-5/0-10 Vdc signal.
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Page 2: Mounting Instructions
Mounting Instructions Mount the sensor in an easily accessible location in a straight section of duct at least five feet from corners or other items that may cause disturbances in the air flow. Avoid areas where the detector is exposed to vibrations or rapid temperature changes. The principal of operation is based on the Venturi effect of the probe that extends into the HVAC duct. - Page 3 Figure 4. Insert conduit or cable gland Make wiring connections as per the “Wiring” illustrations on Page 2. Swing door closed until securely latched. For added security, 2 screws are provided that may be installed in the integrated screw tabs. See Figure 5.
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Page 4: Operation
Figure 6. Wiring Figure 7. Typical 4-20 mA wiring with 24 Vdc and all options Outputs The CO2 output is scaled so that 4-20 mA (or 0-5/0-10VDC) equals 0 to Out_High as set in the user menu. The factory default is 0- 20,000 ppm. - Page 5 Altitude The default is 0 feet. Change by using <ROLL> from 0 to 5000 feet in 500 foot increments for CO2 local altitude correction. 0 Ft <MENU> Press to advance to next menu item. For models with relay option installed Relay SP The relay trip setpoint default is 1000 ppm.
- Page 6 Enter the user menu and use the <MENU> key to advance to Calibrat 0 PPM. Press and hold the <SAVE> key for 2 seconds and the display will change to Waiting Calibrat then to Waiting 5 minute to indicate that the process of setting the internal calibration is taking place.
- Page 7 ©, Distech Controls Inc. 2022 All rights reserved. Distech Controls is not responsible for damages or claims arising out of improper or careless installation or handling of its products. 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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