VERIS CW2 Series Air Quality Sensor Installation Guide

: September 26, 2024
: VERIS

Table of Contents

CW2 Series Air Quality Sensor
Specifications
Product Usage Instructions
Installation
Connecting Sensors
User Interface Options
Setting Setpoints
- Frequently Asked Questions (FAQ)
Q: Can I use the CW2 Series sensors in wet locations?
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

CW2 Series Air Quality Sensor

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Specifications

Operating Environment: IP Rating IP 30,
suitable for indoor use only, not suitable for wet locations
Mounting Location: Surface mount on Single
Gang J-Box, British Standard, and CE60 wall boxes
CO2 Transmitter:
- Sensor Type: Non-dispersive infrared (NDIR),
  diffusion sampling
- Output Range: 0 to 2000/5000 ppm
  (selectable)
- Response Time:
- 0 to 5%: Target value (0 to 50)
- 5 to 10%: Average (50 to 100)
- 10 to 20%: Slightly increased (100 to 200)
- 20 to 61%: Significantly increased (200 to 610)
- Greater than 61%: Greatly increased (greater than 610)
RH Transmitter Option:
- HS Sensor: Solid state capacitive,
  replaceable
- Hysteresis: 1.5% typical
Temperature Transmitter Option:
- Sensor Type: Solid state, integrated
  circuit
Display Models:
- Touchscreen: 61 mm (2.4 in), color, backlit,
  capacitive, 240×300 px
- LCD: 52mm (2.05 in), segmented with 3
  buttons
Setpoints:
- Humidity Setpoint: 0 to 10V output, scale: 0
  to 100% RH
- Fan Speed Setpoint: 0 to 10V output (Off 0V,
  Auto 1.5V, Low 3.3V, Med. 6.7V, High 10.0V)

Product Usage Instructions

Installation

1. Ensure the device is mounted in an indoor location with IP
Rating IP30.

2. Mount the device on a Single Gang J-Box, British Standard, or
CE60 wall box.

Connecting Sensors

1. Connect the appropriate sensors based on the model type (CO2,
VOC, RH, temperature).

User Interface Options

1. Select the desired user interface option: touchscreen
(CW2Txxxx), LCD with three buttons (CW2Lxxxx), or blank
(CW2Xxxxx).

Setting Setpoints

1. Adjust the setpoints for humidity and fan speed as needed
using the specified output range.

Frequently Asked Questions (FAQ)

Q: Can I use the CW2 Series sensors in wet locations?

A: No, the CW2 Series sensors are suitable for indoor use only
and not recommended for wet locations due to their IP Rating of
IP30.

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Installation Guide Air Quality

CW2 Analog Series

CW2Txxxx

CW2Lxxxx

CW2Xxxxx

Veris Industries Stratford Park 5 Telford TF3 3BL United Kingdom
WARNING
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH
· Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E or CSA Z462. ·This equipment must only be installed and serviced by qualified electrical personnel. · Turn off all power supplying this equipment before working on or inside equipment. · Always use a properly rated voltage sensing device to confirm power is off. · Replace all devices, doors and covers before turning on power to this equipment. Failure to follow these instructions can result in death, serious injury or equipment damage.
This product is intended for use in HVAC and building environmental control applications. It is not intended for direct medical monitoring of patients. Read and understand these instructions before installing this product. The installer is responsible for all applicable codes. If this product is used in a manner not specified by the manufacturer, the protection provided by the product may be impaired. No responsibility is assumed by the manufacturer for any consequences arising out of the use of this material.

Wall Mount Air Quality Sensors

Product Overview
The CW2 Series of air quality sensors for living space is a flexible multi- sensor platform for use with BAS controllers designed to accept 4 to 20mA, 0 to 5Vdc or 0 to 10Vdc outputs. CW2 Series sensors are available with three user interface options: touchscreen, LCD with three buttons and blank. CO2 and temperature sensors are included with all CW2 Series air quality sensors. Models with VOC sensors and relative humidity sensors are also available.
Product Identification

User Interface CW2

Output

RH Accuracy¹ Temperature

VOC Sensor

T = Color touchscreen A = Analog output 2 = 2%

L = 3-button LCD display

X = None 2

A = Transmitter

V = NDIR CO2/VOC

C = 1000 PT RTD

= None

D = 10K T2 thermistor

G = 10K CPC thermistor 3

H = 10K T3 thermistor

K = 10K curve G/11K shunt

M = 20K NTC thermistor

N = 1.8K TAC thermistor

1. Replaceable RH module available to be ordered separately per table below. 2. For analog non-display, non-RH, models with RTD/thermistor order from CWE2 line. 3. Available in CW2LAXG only. 4. VOC only availble with temperature transmitter option.

Replaceable RH Elements

Model HS1N HS2N HS2X

RH Accuracy ±1% ±2% ±2%

Calibration Certificate X X

Description Replaceable RH sensor, 1% with NIST certification Replaceable RH sensor, 2% with NIST certification Replaceable RH sensor, 2%

Specifications
OPERATING ENVIRONMENT
Input Power Class 2; 20 to 30 Vdc, 24 Vac, 50 to 60 Hz Analog Output Selectable 4 to 20 mA, 0 to 5 V, 0 to 10 V Operating Temp. Range 0 to 50 °C (32 to 122 °F) Operating Humidity Range 0 to 95% RH non-condensing Housing Material High-impact ABS plastic Terminal Block Torque 0.5 to 0.6 N-m (0.37 to 0.44 in-lbf)
IP Rating IP 30 Mounting Location For indoor use only. Not suitable for wet locations.
Surface Mount The device can be surface mounted on Single Gang J-Box, British Standard and CE60 wall boxes

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CW2 Analog Series Installation Guide

Specifications (cont.)

CO2 TRANSMITTER

Sensor Type Non-dispersive infrared (NDIR), diffusion sampling

Output Range 0 to 2000/5000 ppm (selectable)

Accuracy ±30 ppm ±3% of measured value Repeatability ±20 ppm ±1% of measured value

Response Time <60 seconds for 90% step change

VOC TRANSMITTER OPTION

Sensor Type Solid state Output Range 0 to 100% AQI for VOC
Accuracy ±15% of measured value

Output Scale 0 to 1,000 ppb of total VOC (TVOC)

Level Ventilation Recommendation TVOC (ppb)

AQI Table* >61% Greatly increased 20 to 61% Significantly increased

610 200 to 610

10 to 20% Slightly increased

100 to 200

5 to 10% Average

50 to 100

0 to 5% Target value

0 to 50

RH TRANSMITTER OPTION

HS Sensor Solid state capacitive, replaceable

Accuracy ±3.8% RH from 10 to 60% RH @ 25°C (77 °F) (Includes Hysteresis)** ±4.8% RH from 60 to 80% RH @ 25°C (77 °F)
±5.8% RH from 80 to 100% RH @ 25°C (77 °F)

Hysteresis 1.5% typical

Stability ±1% @ 20°C (68 °F) annually for 2 years Output Range 0 to 100% RH

Temperature Coefficient ±0.1% RH/°C above or below 25 °C (77 °F) typical

TEMPERATURE TRANSMITTER OPTION

Sensor Type Solid state, integrated circuit

Accuracy ±0.2 °C (±0.4 °F) typical Resolution 0.1 °C (0.1 °F)

Range 0 to 50 °C (32 to 122 °F)

DISPLAY MODELS

Touchscreen

61 mm (2.4 in), color, backlit, capacitive, 240×300 px Setpoint: 0-10Vdc. Temperature, humidity or fan speed selectable Timeout override: Display timeout Lockout override: Touchscreen/button lockout

LCD 52mm (2.05 in), segmented with 3 buttons Setpoint: 0-10Vdc. Temperature, humidity or fan speed selectable Timeout override: Display timeout Lockout override: Touchscreen/button lockout

SETPOINTS****

Temperature Setpoint 0 to 10V output Scale: 10 to 35 °C (50 to 95 °F) / 0 to 50 °C (32 to 122 °F)

Humidity Setpoint 0 to 10V output Scale: 0 to 100% RH

Fan Speed Setpoint 0 to 10V output Off 0V, Auto 1.5V, Low 3.3V, Med. 6.7V, High 10.0V

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CW2 Analog Series Installation Guide

Specifications (cont.)

OVERRIDE

Override Button Display models feature a momentary-to-ground override button

WIRING TERMINALS

Terminal Blocks Screw terminals, 18-24 AWG Screw Terminal Torque 0.2 N-m (2.0 in-lbF) max.

WARRANTY

Limited Warranty 5 years

COMPLIANCE INFORMATION

Agency Approvals

UL 916, European conformance CE: EN61000-6-2, EN61000-6-3, EN61000 Series – industrial immunity, EN 61326-1 FCC Part 15 Class B, REACH, RoHS, RCM (Australia), ICES-003 (Canada), UKCA (UK)

Air Quality Index for VOC aligns with TVOC levels for IAQ as specified by the WHO (World Health Organization). ** Humidity sensor overall accuracy should include: accuracy, temperature coefficient and stability. Humidity accuracy is shown as an absolute value, so if testing accuracy with a hand-held device, you must check for deviation in its readings instead of calculating the percentual deviation. Additionally, you must consider the overall accuracy of the hand-held device in the comparison. * DIP switch selectable. ** One setpoint type is selectable via DIP switch on display models only.

Dimensions

115 (4.5)

2X .264 [6.7] 2X .142 [3.6]

3.28 83.32
2.374 60.3

Functions

85

24

(3.3)

(0.9)

The CW2 Series sensor measures CO2, VOC (if equipped), RH (if equipped) and temperature in a room and provides analog outputs to a controller.

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CW2 Analog Series Installation Guide

Installation

1. Remove the cover from the base at the bottom of the device.

2. Position the sensor base vertically on the wall 1.35 m (4.5 ft.) above the floor with the “UP” arrow facing upward. Locate away from windows, vents and other sources of draft. If possible, do not mount on an external wall, as this may cause inaccurate temperature readings.
3. Pull 18 or 22 AWG cable(s) through the hole in the backplate.
4. Mount the backplate onto the wall using the screws provided. Six screw holes available. Use a minimum of two for secure mounting.
5. Connect the wires to the screw terminals. Do not over-tighten the screws.

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CW2 Analog Series Installation Guide

Installation (cont.)

Wiring for models with temperature transmitter:.
CONTROL SYSTEM VOC OUT CO2 OUT OVERRIDE* SETPOINT OUT** RH OUT TEMP OUT COMMON
POWER SUPPLY 20-30 Vdc, 24 Vac – COMMON + POWER (+24)

10 9 8 7 6

5432 1

Wiring for models with RTD/thermistor:

CONTROL SYSTEM VOC OUT CO2 OUT OVERRIDE* SETPOINT OUT** RH OUT RTD/THERMISTOR OUT RTD/THERMISTOR OUT COMMON
POWER SUPPLY 20-30 Vdc, 24 Vac – COMMON + POWER (+24)

10 9 8 7 6

5432 1

Momentary to ground. ** 0-10V DIP switch selectable for temperature, RH (if equipped) or fan speed (off, 0V, Auto 1.5V, Low 3.3V, Medium 6.7V or high 10V).

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CW2 Analog Series Installation Guide

Installation (cont.)

6. Set the DIP switches.
ON

12345678

Touch-Button Disable On/Off
Screen Timeout On/Off Temp Range 1 / 2 RH / Fan Setpoint Temp / RH-Fan Setpoint
ABC On / Off
2000 / 5000ppm
5V / 10V
mA / Voltage

Switch

Function

1

Output mode

2

Voltage output range*

Description
ON – 4-20mA output mode enabled OFF – Voltage output mode enabled
ON – 0-5V output range enabled OFF 0-10V output range enabled

3

CO2 output range

ON – 0-2000 ppm CO2 output range enabled OFF – 0-5000 ppm CO2 output range enabled

4

Automatic Baseline Calibration (ABC) ON – ABC enabled

for CO2

OFF – ABC disabled

5

Setpoint output type

ON – Temperature setpoint enabled (temp range selected on DIP switch 6)
OFF – RH or Fan Speed setpoint enabled (specific setpoint output type to be selected on DIP switch 6)
Models without RH option select only temp or fan setpoint

6

Setpoint output temperature range or Temperature setpoint (must be enabled on DIP switch 5)

RH/Fan Speed output type

ON – Temp range 1, 50 to 95 °F (10 to 35 °C) enabled

OFF – Temp range 2, 32 to 122 °F (0 to 50 °C) enabled

RH or Fan Speed setpoint (must be enabled on DIP switch 5) ON – RH setpoint enabled OFF – Fan Speed setpoint enabled Models without RH option, set to OFF

7

Display times out and turns off after ON – Display Timeout enabled

6-10 seconds of touchscreen/button OFF – Display Timeout disabled

press

8

Touchscreen touch functions and

buttons are disabled

ON – Touchscreen touch/button functions disabled OFF – Touchscreen touch/button functions enabled

Only used with voltage output mode enabled. Not applicable to setpoint output. Setpoint is 0-10V fixed.

7. With sensor base fully installed, align top of cover to mounting tabs on top of sensor base. Swing cover downward until it latches at the bottom.

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CW2 Analog Series Installation Guide

Installation (cont.)

8. Install locking screw to secure cover in closed position.

CO2 Sensor Calibration

There are two methods for CO2 calibration available: 400 ppm baseline calibration and automatic baseline calibration (ABC).
400 ppm Baseline Calibration
400 ppm baseline calibration allows the sensor to be set at 400 ppm. Push and hold the calibration button for 3 to 5 seconds. The LED will flash green. Once the button is released, calibration is complete and the LED switches off.

Calibration button access hole LED

Automatic Baseline Calibration (ABC)
The ABC mode addresses the 400 ppm calibration. It allows turning on or off a background correction/recovery mode that will minimize any calibration error that has been caused by shock during handling and transportation or is caused by a long term shift in measurement. The ABC algorithm constantly keeps track of the sensor’s lowest reading over a preconfigured time interval and slowly corrects for any long-term drift detected as compared to the expected fresh air value of 400 ppm. After initial startup, it is expected that the sensor reaches specified accuracy after 7 to 21 days.

Touchscreen Operation

Main Screen
The touchscreen user interface displays applicable sensor output values (temperature, RH, CO2 and VOC), setpoint value, menu button and CO2 stoplight status (if enabled).
Setpoint value (temperature setpoint shown)

Menu button

VOC AQI value Fahrenheit/Celsius Temperature value

RH value

CO2 value

Menu Screen
The menu screen opens when pressing the Menu button on the main screen. Integrator’s submenu, occupancy/override, Fahrenheit/Celsius, settings, setpoint submenu (temp, RH or fan, determined by DIP switch settings) and CO2 stoplight buttons are displayed on the menu screen.

Temperature setpoint DIP switch selected

RH setpoint DIP switch selected

Fan Speed setpoint DIP switch selected

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CW2 Analog Series Installation Guide

Touchscreen Operation (cont.)

Menu Button Functions
Integrator’s Submenu Press this icon to access the Integrator’s menu.

Submenu Only

Menu Button Functions (cont.)

Occupied Override Button Press this icon to provide momentary ground output to the controller
Fahrenheit/Celsius Switch Press this icon to display either °C or °F.

Single Press Only Signals occupied/override call to controller.
Single Press Only Changes units to Fahrenheit when pressed. Changes units to Celsius when pressed.

Settings This icon provides the ability to change the color scheme of the display.

Submenu Only

Temp Setpoint Adjustment

Submenu Only

Click this icon to access the setpoint

change menu. Mutually exclusive

with fan speed, set by DIP switch.

Humidity Setpoint Adjustment Submenu Only Click this icon to access the setpoint change menu. Mutually exclusive with humidity and fan speed. Set by DIP switch.

Fan Speed Click this icon to access the fan speed menu. Mutually exclusive with humidity and fan speed. Set by DIP switch.

Submenu Only
A
Selected

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CW2 Analog Series Installation Guide

Touchscreen Operation (cont.)

CO Stoplight Menu 2
Click this icon to toggle the CO2 Stoplight feature on and off. With CO Stoplight turned on,
2
the background color of the main screen changes with CO2 level. This provides a visual indicator of CO2 levels to the room occupants.
Using the +/- buttons, the thresholds at which the colors change on the main screen are user configurable, as described in the diagram.

Submenu Only

Feature is ON Feature is OFF

Default1

Default2

Green3 CO2 <1000 ppm

Yellow & Single Flag4

Red & Double Flag4

CO2 = 1000-1499 ppm CO2 = 1500-10,000 ppm

1. Values <400 ppm will be rounded up to the minimum limit of 400 ppm. 2. Values >10,000 ppm will be rounded down to the maximum limit of 10,000 ppm. 3. Possible to adjust CO thresholds by changing the yellow and red limits. 4. User configurable in increments of 10 ppm using the +/- buttons. With a long press
of these buttons, the number will change more quickly.

LCD Display Operation Button Functions

Change Values Menu Advance Change Values

Display Icons
The main screen displays sensor values for CO2, VOC (if equipped), RH (if equipped), temperature and Celsius/Fahrenheit.

Temperature Value
Humidity Value (if equipped)

CO2 Value VOC Value (if equipped) Alternates between CO2 and VOC every 6 seconds
Override Press Indicator

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CW2 Analog Series Installation Guide

Setpoint Function

A single 0-10V setpoint (temperature, RH (if equipped) or fan speed) can be selected via DIP switch.
Temperature Setpoint Adjustment

Press the Menu Advance button

Adjusts setpoint up Adjusts setpoint down

After adjustment, wait 6 seconds or press the Menu Advance button. Setpoint is accepted and main screen appears.

Note: Numeric information will flash while in Set mode.

RH Setpoint Adjustment

Press the Menu Advance button
Note: Numeric information will flash while in Set mode.

Adjusts setpoint up Adjusts setpoint down

After adjustment, wait 6 seconds or press the Menu Advance button. Setpoint is accepted and main screen appears.

Fan Speed Setpoint Adjustment

Press the Menu Advance button

Adjusts setpoint up

Adjusts setpoint down Note: Fan speed scale flashes when in Set mode. Off setting is default.

Low Medium High Auto

After adjustment, wait 6 seconds or press the Menu Advance button. Setpoint is accepted and the main screen appears.

Changing Celsius and Fahrenheit Scales

Press the Menu

Advance button 2

times

2x

Note: ºF or ºC text will flash while in Set mode.

Adjusts from ºF to ºC Adjusts from ºC to ºF

After adjustment, wait 6 seconds or press the Menu Advance button to return to the main screen.

Occupied/Override Button
Press and hold the Menu Advance button for 1 second

Override Press Indicator illuminates for 6 seconds, indicating a momentary output to ground.

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CW2 Analog Series Installation Guide

China RoHS Compliance Information

Environment-Friendly Use Period (EFUP) Table

– Hazardous Substances

Part Name (Pb) (Hg) (Cd) (Cr (VI)) (PBB) (PBDE)

Electronic

X

O

SJ/T11364 O: GB/T 26572 X: GB/T 26572

This table is made according to SJ/T 11364. O: indicates that the concentration of hazardous substance in all of the homogeneous materials for this part is below the limit as stipulated in GB/T 26572. X: indicates that concentration of hazardous substance in at least one of the homogeneous materials used for this part is above the limit as stipulated in GB/T 26572
Z000057-0B

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