Distech Controls GS-2CDD02K Series User Manual

Hardware Installation Guide
GS-2CDD02K Series
Carbon Dioxide Transmitter
Figure 1: GS-2CDD02K Carbon Dioxide Transmitter
Product Description
This document describes the hardware installation procedures for the GS-2CDD02K Series duct carbon dioxide gas detectors.
The GS-2CDD02K CO
2
transmitter uses Infrared Technology to monitor CO
2
levels up to 2000 ppm (adjustable to 10,000 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:
- Upon unpacking the product, inspect the contents of the carton for shipping damages. Do not install damaged device.
- Avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.
- 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.
NOTE: This CO
2
sensor incorporates a Self Calibration feature to correct CO
2
sensor drift. This feature is recommended for
applications where the CO
2
will be exposed to fresh air (400 ppm) at least one hour per day. If the monitored space is occupied 24
hours or consistently maintains higher or lower levels of CO
2
, it is recommended that this feature be turned off, but yearly calibration
will be required. If the self calibration is disabled at installation time without allowing for 7 day auto calibration cycle, then a manual
calibration should be performed to ensure accuracy of the device.

Distech Controls GS-2CDD02K Series Specifications

General

Brand	Distech Controls
Model	GS-2CDD02K Series
Category	Transmitter
Language	English

Summary

Product Description

General Installation Requirements

Mounting Instructions

Probe Installation and Duct Mounting

Procedure for drilling holes, inserting the probe into the duct, and securing the enclosure to the duct.

Enclosure Access and Conduit Fitting

Instructions on opening the hinged cover and connecting conduit or cable glands.

Wiring

Power and Signal Connections

Details on connecting power, common, analog output (mA/Volt), temperature, and relay terminals.

Wiring Diagrams and Power Supply

References to typical wiring diagrams and considerations for power supply and grounding.

Outputs

Analog Output Configuration

Information on selecting and configuring the analog output signal (4-20 mA or voltage).

Start-up Mode

Normal Mode

Relay Mode

User Menu

CO2 Span Configuration

Setting the analog output scaling for CO2 levels from 1000 to 10,000 ppm.

Self-Calibraton Setting

Enabling or disabling the automatic CO2 sensor self-calibration feature.

Altitude Compensation

Adjusting for local atmospheric pressure and altitude for CO2 accuracy.

Voltage Output Selection

Configuring the analog voltage output span to 0-5 Vdc or 0-10 Vdc.

Analog Output Direction

Setting the analog output signal direction to Direct or Reverse.

Output Test Function

Controlling the analog output signal for testing purposes (OFF, MIN, MAX).

Temperature Sensor Settings

Temperature Units (°C/°F)

Selecting the display units for temperature measurement.

LCD Display Options

Configuring what information is shown on the LCD display.

Backlight Control

Managing the LCD backlight function (Auto, Off, On).

Temperature Offset Calibration

Adjusting the displayed temperature value by adding or subtracting an offset.

Relay Configuration Options

Relay Setpoint Assignment

Assigning the relay to trigger based on CO2 or temperature setpoints.

Relay Hysteresis Setting

Defining the hysteresis value for relay activation and deactivation.

Relay Delay and Test

Relay Delay Time Setting

Setting the delay time for relay activation to prevent false alarms.

Relay Test Function

Enabling or disabling the relay to test its operation.

Calibration Reference and Procedure

Calibration Gas Level Setting

Setting the calibration gas level (ppm) used for sensor calibration.

Gas Calibration Procedure

Detailed steps for performing a field calibration of the CO2 sensor using calibration gas.