ETC echoflex RCT User manual

Page Page1 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Wireless CO2, Humidity and temperature sensor
rCt Detailed Installation and
Commissioning Guide
Copyright © 2019 Echoex Solutions, Inc.
All rights reserved. Product information and specication details subject to change
Document number: 8DC-5771 Rev: 1.2 Released: 2019-05

Page 2
Echoex intends this document, whether printed or electronic, to be read
in its entirety.

Page 3 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Table of Contents
Overview 1
Document Conventions�������������������������������������������������������������������� 1
The RCT CO2 Sensor ������������������������������������������������������� 2
Radio Communications �������������������������������������������������������������������� 2
Receiver Proximity ��������������������������������������������������������������������������� 2
Performing a CO2 Background Calibration ���������������������� 3
Reading the CO2Concentrations ������������������������������������ 4
Light Harvesting Transmitter Description������������������������ 5
COLED Indication ���������������������������������������������5
An example of determining exact CO2value from blink code: ������� 6
 7
Linking the RCT Sensor to a Receiver������������������������������� 8
Using The Adjustment and Test Functions����������������������� 8
 10
Light Level Test������������������������������������������������������������� 10
LIGHT LEVEL TEST TABLE ���������������������������������������������������������������� 10
����������������������������������������� 11
Automatic Background Calibration Activation�������������� 11
���������������������������������� 11
Guidelines for Installing Wireless Devices 14
Wireless System Layout Hints ��������������������������������������� 15
 16
Agency and Regulatory Statements ������������������������������ 17

Table of Contents Page 4

Page 1 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Overview
The CO2 sensor (also referred to as the sensor in this guide) is a
wireless, energy harvesting sensor that :
• monitors CO2 levels from 0-2000 ppm,
• room temperature in the range of 0-51°C (32°F to 124°F) and
• relative humidity in the range of 0-100% .
The CO2 measurement is also automatically altitude corrected
using a sensitive (± 3ft) absolute pressure sensor. The device comes
populated with a CR2032 coin cell battery to provide backup power
for up to 5 years of operating time. The product is designed to
operate with 3rd party receivers, controllers and gateways designed
for EnOcean compatible wireless networks. The sensor is intended
for indoor use only.
A button on the lower right edge of the sensor body can be used
to cause the LED’s to blink a code that indicates CO2concentration
or to go into test mode (when the button is held down, see “Test
Operating Modes”).
Document Conventions
This document includes the following conventions to draw attention
to important information.
iNote: Notes are helpful hints or information that supplement
the main content.
Echoex's user documentation is designed for print or electronic
use. Benets to using the electronic format include using the table
of contents to jump to a desired page by clicking on the heading or
using word search to nd a specic topic.
Cross references highlighted in this document are links to the
referenced section of the guide.
. This guide is available for free download from Echoex Solutions
website: www.echoexsolutions.com

Overview Page 2
The RCT CO2 Sensor
The RTC is specically designed for building systems where indoor
environmental quality and potential savings from utilizing CO2based
demand controlled ventilation is desired.
The RTC is a versatile, wireless CO2, temperature and humidity
transmitter that operates based on energy harvested from indoor
ambient light. The sensor has no wires, requires no maintenance
and can be easily installed and integrated into an EnOcean® wireless
network. This sensor platform is ideal for EnOcean® networks
installed in new or existing buildings. EnOcean is an open, wireless
protocol that allows integration with a variety of other products and
systems.
Batteries are not required for everyday operation due to the
advanced solar energy harvesting and power management features
of the sensor. There is a clip for a coin cell battery (battery provided)
to aid in quick installation and to provide extended backup in no
light or low light conditions. The sensor will operate under battery
power for over ve years.
iNote:
Tricolored LEDs provide indications to aid with
installation as well as a means of displaying current CO2
levels at the push of a button.
Radio Communications
The RTS is a wireless device capable of transmitting telegrams.
The sensor transmits status telegrams that contain the information
dened within a equipment prole.
The sensor supports the following proles:
A5-09-04: CO2Sensor + Temperature Sensor + Humidity Sensor
The valid ranges for each data element:
CO2: 0 - 2000 ppm
Temperature: 0 - 51°C, (32° - 124°F)
Humidity Sensor: 0 -100% RH
Receiver Proximity
The sensor transmits to a receiver which is typically a device that is
programmed to provide HVAC ventilation and temperature control in
the space that the sensor is monitoring for closed loop temperature
control. The sensor and receiver must be within range, preferably
in the same room and installed within 50’ (15.2 m) of each other.
For applications exceeding 50’ (15.2 m) range, greater care must be

Page 3 RTC CO2, Temperature and Humidity Sensor Configuration Guide
taken to insure proper reception of the sensors transmissions at the
receiver, refer to sections “Test Operating Modes” and ‘Installing
Wireless Devices”.
iNote:
The RCT comes populated with a CR2032 coin cell battery.
The battery is not required for normal operation when
the RCT receives adequate natural or articial light. The
battery is required for calibration.
iNote:
Even with a brief exposure to light the sensor will operate,
however for best results the sensor should be mounted in
a location with exposure to 4 hours of natural or articial
light on a daily basis.
Performing a CO2 Background Calibration
It is highly recommended that the installer perform an ambient air
calibration of the RCT as part of the installation process. The sensor
will take the lowest CO2 recorded since its last calibration cycle and
assign this reading the value of 420ppm (outdoor air). This process
takes 15-60 minutes and can be performed on-site or prior to visiting
the site. Multiple sensors can be calibrated at the same time. Further
instructions on other adjustments that can be made can be found
on page 10
1) Place the sensor(s) in outside air above 32ºF (0ºC), and out of
direct sunlight for 15 to 60 minutes. Avoid areas where people are
lingering so the background CO2 readings are not affected. The
sensor will take the lowest CO2 recorded since its last calibration
cycle and assign this reading the value of 420ppm (outdoor air).
2). Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
3.) Tap the function button to cycle through modes. Once the Red
LED (only) is blinking, press and hold for ~ 6 seconds to enter CO2
background calibration mode, there will be a pause then the Green
LED will begin blinking.
4). After about 6 seconds the green LED will stop blinking when
calibration is complete.
Install the sensor in the targeted location and connect to an
EnOcean network.
There is also an option to set a specic value for the CO2sensor to
calibrate to. The process for doing this is explained in detail later in
this guide. It is important to note that any calibrations should be
done so that the air around the sensor is at the concentration to be
used for calibration. Flowing calibrated gas through a tube to the

Overview Page 4
inside of the sensor is not a valid or accurate method of calibration.
For commissioning purposes, the best way to evaluate the sensor is
to compare the sensor to a hand held CO2 sensor that has recently
been calibrated at approximately the same altitude (± 500 ft).
Reading the CO2Concentrations
The RCT does not have a digital display but it is possible to
1. Quickly determine the general range of CO2 concentration in
the space and
2. Determine the actual concentrations in the space.
Current CO2 range is indicated by an LED blink every 15 seconds.
Green LED: < 1100 ppm (good)
Amber LED: 100 to 1500 ppm (marginal)
Red LED: > 1500 ppm (poor ventilation)
Acquiring current CO2 concentration:
• Press function button on lower right side for 1 second.
• Count LED blinks, add together for current level:
Green = 500 ppm
Amber = 100 ppm
Red = 25 ppm
See example on page 6
Red LED
Amber LED
Green LED
Solar Panel
RCT Sensor - Reading the CO Level
Current Range:
Indicated by an LED blink every 15 seconds
• Green (lower LED): < 1,100 ppm (Good)
• Amber (middle LED): 1,100 to 1,500 ppm (marginal)
• Red (upper LED): > 1,500 ppm (poor ventilation)
Current Concentration
1. Press button on lower right side for 1 second
2. Count LED blinks (and add) for current CO2
concentration
• Green blink = 500 ppm
• Amber blink = 100 ppm
• Red blink = 25 ppm
2
CO2
CO2

Page 5 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Light Harvesting Transmitter Description
In order to best manage power, the transmitting interval of the RCT
is automatically managed dependent on ambient light levels, rate of
measurement change and amount of power stored in the sensor.
Telegrams are sent at the following intervals:
• If the temperature change between last transmitted value and
the current sample is > 0.6°C (1.1°F), the sensor will transmit
immediately.
• If the RH value change between last transmitted value and the
current sample is > 3%, the sensor will transmit immediately.
• If the CO2 value change between samples is > 200 ppm, the
sample and heartbeat rate shall adjust to 300 sec (5 min) for 1
sample period
• The CO2 sample rate value is derived from three consecutive
readings from the COZIR sensor averaged with the previous
transmitted value, level 1 and 2 only. For level 3, only the 3
readings taken during the current sample are averaged.
Ambient Light Temp/RH
Sampling Rate
CO2 sampling
Rate
Heartbeat Rate
> 200 lux (18.5 fc) 16 sec 300 sec (5 min) 300 sec (5 min)
< 200 lux (18.5 fc) 32 sec 600 sec (10 min) 600 sec (10 min)
<50 lux for 16 hours 64 sec 1200 sec (20 min) 1200 sec (20 min)
CO2LED Indication
There are 3 LEDs located on the right side of the solar panel. The RCT
will provide an indication of the current CO2 measurement range by
ashing every 15 seconds (with sufcient light, > 5 footcandles or 50
lux). Ranges indicated by the ash are as follows:
• Green = < 1100 ppm (Good ventilation/air
quality)
• Yellow = 1100-1,500 ppm (marginal
ventilation/air quality)
• Red = >1,500 ppm (low ventilation &
potentially poor air quality)
2,600
2,400
2,200
1,800
1,600
1,400
1,200
1,000
800
600
400
5
6
8
10
15
20
25
30
Ventilation Rate (cfm/person)
Poor
Under
Ventilated
Marginal
Unacceptable
Outside
Levels
Indoor
Optimal
CO Concentration
2

Installation Page 6
iNote: These LEDs are also used as feedback for the Test
functions
To determine the exact CO2 value, press the function button on
the side of the unit. The LEDs will ash in sequence to indicate the
concentration where:
• Green blinks = 500 ppm/blink
• Amber blinks = 100 ppm/blink
• Red blinks = 25 ppm/blink
Add the blink values up to determine the concentration.
An example of determining exact CO2value from blink
code:
• 2 green blinks = 1000 ppm
• 3 amber blinks = 300 ppm
• 2 red blinks = 50 ppm
• Total CO2 = 1350 ppm
• The colored chart is a guideline for mapping the CO2
concentration and how this value reects on the spaces
ventilation rate.

Page 7 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Installation
The RCT can be mounted on any surface; glass, stone, concrete,
wallboard, cubicle partitions, etc. The sensor can be mounted using
screws (not supplied) through the removable back plate (2 keyholes
or using double-sided tape or Velcro™ (not supplied).
The mounting location of the wireless transmitter is important, as
this will directly affect the receiver’s reception of the telegrams.
Before installing, refer to following sections in the guide detailing
the installation of wireless devices, layout tips and the test operation
modes.
1. The RCT has a removable back plate.
The back plate has a security feature which
requires a tool for the removal of the device
from the back plate. To remove the back
plate, insert a at head screw driver, into
the slot and exert torque on the key tab to
separate the back plate from the housing
body as shown in the photos. Once the tab
is free, pull the body away from the back
plate.
2. Mount the back plate to a bracket or
the wall surface in a vertical orientation
with the plastic key on the bottom. There
are keyholes in the back plate that mate
with standard electrical box screw patterns.
Alternatively, you can mount the sensor
using double sided tape or Velcro® (not
supplied).
3. Once the back plate has been secured
to the wall or mounting bracket, align the two top alignment
tabs on the back plate with the enclosure body and press the
lower edge over the plastic key until it clicks in place.

Installation Page 8
Linking the RCT Sensor to a Receiver
This process requires the controller or receiver to be mounted and
powered and within range of the RCT sensor to be linked.
The sensor is a solar powered device that absorbs energy through a
solar panel storing it for use during low light periods. Batteries are
included to assist in start up procedures and for continual low light
conditions.
1. Remove the sensor from the back plate by pressing in on the tab
on the bottom of the sensor and pulling
away from the back plate.
2. Activate LEARN or LINK mode at
the receiver, if necessary refer to the
manufacturers documentation.
3. Press the temperature sensors Link
(Teach) button.
4. Deactivate LEARN mode at the receiver.
Using The Adjustment and Test Functions
The RCT uses a single button interface to allow installers and users
to make adjustments to the sensor and utilize built-in test functions.
Pressing the “function” button at the right side of the sensor at
different intervals allows navigation to different functions. Feedback
is provided by observing the color and sequence the LEDs at the side
of the solar panel.

seconds
- The Green LED ashes
- There are 4 test modes. Press the Test button to cycle
through the colored LEDs (ashing) Green, Amber,
Red and both Green and Red ashing.
Test 1: Green LED ash, Light Level Test
-When green LED is ashing, hold the test button for 6 seconds to
activate
The Green LED ash rate indicates the light level
(more details below )- The test runs for 100 seconds

-for future use (Requires controller that is Range Conrmation®
compatible)

Page 9 RTC CO2, Temperature and Humidity Sensor Configuration Guide

1) Place the sensor(s) in outside air above 32ºF (0ºC), and out of
direct sunlight for 15 to 60 minutes. Avoid areas where people are
lingering so the background CO2 readings are not affected. The
sensor will take the lowest CO2 recorded since its last calibration
cycle and assign this reading the value of 420ppm (outdoor air).
2). Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
3.) Tap the function button to cycle through modes. Once the
Red LED (only) is blinking, press and hold for ~ 6 seconds to enter
CO2 background calibration mode. There will be a pause then the
Green LED will begin blinking.
4). After about 6 seconds the green LED will stop blinking when
calibration is complete.
     

1. Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
2. Tap the function button to cycle through modes. Once the Red
and Green LEDs are blinking, press and hold for ~ 6 seconds to enter
CO2 calibration setup mode.
If the Green LED is blinking, Automatic Background Calibration
(ABC) is enabled.
If the Red LED is blinking, ABC is disabled.
3. Press the function button to cycle through CO2 calibration mode.
• Green LED blinking - Automatic Background Calibration (ABC)
enable.
• Red LED blinking - ABC disable
• Amber LED blinking - calibrate to absolute CO2 value.
Step through the menu until at the desired mode. Press and hold the
function button for about 6 seconds to set desired mode.
.Press and hold the test button for 6 seconds to enter any of the
above modes- see more details in Test Operating Modes below.

Test Operating Modes Page 10
Test Operating Modes
iNote:
When entering test mode: if the red LED blinks and not
the green LED, place the sensor under a lamp for 1 hour
or replace the battery.
Note: Battery (with voltage between 2.7 and 3V) is required for
installation and commissioning modes.
Light Level Test
This test will indicate the real-time energy produced by the solar
panel allowing the installer to verify a good installation location
(independent from battery strength).
1. Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
2. Tap the function button to scroll through modes, when the
Green LED is ashing, hold the test button for 6 seconds to
enter Light Level Test mode, the green LED will start blinking a
pattern according to the light level. (See Light Level Test Table
below)
3. Hold the sensor in the location you are thinking of installing
the sensor and check the light level using the Light Level Test
Table below.
4. The test will repeat every 2 seconds and run for a duration of
100 seconds. You may quit the test at any time by pressing the
test button for 6 seconds.
LIGHT LEVEL TEST TABLE
The green LED will blink according to the energy produced by the
solar cell
Blinks Lux Foot Candles Time to Fully Charge Discharge me
0< 50 < 4�6 Non operaonal n/a
150-100 4�6 - 9�3 min operang level n/a
2100-200 9�3 - 18�6 32 hours to full charge 72 hours
3200-500 18�6 - 246�5 16 hours to full charge 72 hours
4500-1000 46�6 - 92�9 8 hours to full charge 72 hours
51000+ 92�9+ 4 hours to full charge 72 hours
The time to fully charge is based on the storage capacitor charging
i

Page 11 RTC CO2, Temperature and Humidity Sensor Configuration Guide
from a non-operational condition. Discharge time indicates how
long a fully charged sensor will operate in the dark.
CO2 Background Calibration
1) Place the sensor(s) in outside air above 32ºF (0ºC), and out of
direct sunlight for 15 to 60 minutes. Avoid areas where people are
lingering so the background CO2 readings are not affected. The
sensor will take the lowest CO2 recorded since its last calibration
cycle and assign this reading the value of 420ppm (outdoor air).
2). Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
3.) Tap the function button to cycle through modes. Once the
Red LED (only) is blinking, press and hold for ~ 6 seconds to enter
CO2 background calibration mode, There will be a pause then the
Green LED will begin blinking..
4). After about 6 seconds the green LED will stop blinking when
calibration is complete
Automatic Background Calibration - Explained
The Automatic Background Calibration (ABC) is a feature that
looks at the lowest level of CO2 that occurs over a 3 week period
and assumes it is an outside background level of 420 ppm. This
feature works best where the space being monitored is periodically
unoccupied for 8 hours or more in evenings or weekends at least
once in a typical 3 week period. When in this mode there should
be no need to calibrate the sensor over its operating life. The ABC
feature is on by default. If the space being monitored is occupied
24/7 or is an industrial or greenhouse operation where elevated CO2
levels may be sustained over long periods of time, then the ABC
feature should be turned off.
CO2 Calibration and Setup Mode
1. Press the function button on the sensor until the green LED is
blinking, about 6 seconds.
2. Tap the function button to cycle through modes. Once the Red
and Green LEDs are blinking, press and hold for ~ 6 seconds to enter
CO2 Calibration Setup Mode. If the Green LED is blinking, ABC is
enabled. If the Red LED is blinking, ABC is disabled.
There are 4 adjustment options selectable by pressing the test button
once in Calibration and Setup Mode

Test Operating Modes Page 12
3. Press the function button to cycle through CO2 calibration mode.
• Green LED blinking - Automatic Background Calibration (ABC)
enable. The sensor will self calibrate every 3 weeks in this mode.
• Red LED blinking - ABC disable (if sensor is in an environment that
may have sustained elevated CO2 levels).
• Amber LED blinking - calibrate to absolute CO2 value.
Absolute value calibration allows the user to select a CO2 value with
25 ppm resolution.
• Green blinks = 500 ppm
• Amber blinks = 100 ppm
• Red blinks = 25 ppm
The sensor will display the current value (pressure compensated) in
blinks once entering into this mode (green then amber then red). The
user must press the test mode button to increase the ppm value or
the link button (on the back) to decrease
the value (also pressure compensated)
in 25 ppm increments. The background
ppm level is set to 420 ppm.
Press and hold the test button for 6
seconds to enter any of the above
modes-

Page 13 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Replacing the Battery
The battery is a CR2032 coin cell and is supplied with the unit. The
battery is not required for normal operation when the RCT receives
adequate natural or articial light. The battery must be used during
installation and has enough power to run the sensor for 5 years
without light. The battery should be replaced if voltage is less than
2.7V
1. Remove back plate of the RCT by pressing a screwdriver into the
slot key on the bottom of the sensor enclosure and pull the body
away from the back plate. The top of round battery cover just
snaps completely out to allow placement of the battery.
2. To remove old battery: Using a small at head
3. Screwdriver or pen as a lever, insert pointed end under the clear
plastic battery retaining clip’s edge and pop the clip off.
4. Install or replace the battery in the clip with a new CR2032 coin
cell battery insuring the positive side (+) will be facing up.
5. Align the two straight edges of the retaining clip with the
battery holder and press the clip in with your nger.

Guidelines for Installing Wireless Devices Page 14
Guidelines for Installing Wireless
Devices
Careful planning is needed when locating the receivers and
transmitters based on the construction materials in the space and
possibility of tenant’s furniture disrupting the transmissions.
The temperature sensor should be installed in the space where
the receiver is mounted and connected to the temperature control
equipment however the signal will travel through material barriers.
Refer to the tables below for range considerations with building
materials that reduce the radio signal power.
Material Aenuaon
Wood 0 - 10%
Plaster 0 - 10%
Glass 0 - 10%
Brick 5 - 35%
MDF 5 - 35%
Ferro concrete 10 - 90%
Metal 90 - 100%
Aluminum 90 - 100%
Material Radio Range-typical
Line of sight: 80’ (24m) corridors
Line of sight: 150’ (46m)open halls
Plasterboard: 80’ (24m) through 3 walls
Brick 33’ (10m) through 1 wall
Ferro concrete 33’ (10m) through 1 wall
Ceiling: Not Recommended

Page 15 RTC CO2, Temperature and Humidity Sensor Configuration Guide
Wireless System Layout Hints
• Avoid locating transmitters and receivers on the same wall.
• Avoid locating transmitters and receivers where the telegrams
must penetrate walls at acute angles. This increases the material
the telegram must pass through reducing the signal power.
• Avoid large metal obstructions as they create radio shadows.
Place receivers in alternate locations to avoid the shadow or use
repeaters to go around the obstacle.
• Do not locate receivers close to other high frequency
transmitters. Leave at least 3’ (1 m) between the receiver and
any other source of interference including, ballasts, LED drivers,
computers, video equipment, Wi-Fi/LAN routers, GSM modems
and monitors. Transmitters are not affected by these sources of
interference. Agency Listings and Compliance

Product Specications Page 16
Product Specifications
Carbon Dioxide
Technology: Ultra Low Power, LED based NDIR
Measurement Range: 0-2000 ppm
Accuracy: ± 50ppm
Altitude/Pressure Compensation: Built-in correction
Self-Calibration: Automatic Background Calibration
Resolution: 1 data byte (0-200 decimal), 10 ppm
Temperature
Range: 0ºC to 51ºC (32ºF to 124ºF)
Accuracy: ± 0.3ºC (± 0.5ºF)
Resolution: 1 data byte (0-255 decimal), 0.2ºC (0.36ºF)
Relative Humidity
Range: 0% to 100% RH
Accuracy: ±3% RH…10-90%, ±7%... 0-10%, 90-100%
Resolution: 1 data byte (0-200 decimal), 0.5%
Power Supply
Type: Integrated Solar Panel
Operational Light Levels: 50 lux
Minimum Charge Time before Operation: 10 min @ 200 lux
Charging Light Level: 200 lux
Maintain Operating Life Level: 200 lux for 6 hours
Maximum Charge Time: 16 hours @ 200 lux
Operating Life From Full Charge: 72 hrs @ 0.0 lux
Battery: for backup, start assist & test mode (supplied). Use high quality
CR2032 coin cell. The battery will typically provide 5 years operating life
in zero light conditions.
General
Weight: 115 g, (4 oz)
Mounting: screws or double sided tape (not included)