ZGw08VRC English Manual
Wall Mount CO2 Monitor Operating Instructions
LCD Display Symbol
Model: ZGw08VRC
Product Overview
Thank you for selecting this CO2 wall mount monitor. This product was developed to detect the presence
of CO2 in the ambient air and help people to take care of the Indoor Air Quality. The compact device is
designed for use in HAVC in the building. The demand controlled ventilation in the building, also the
greenhouse with the CO2 concentration control.
By using the CO2 monitor as the indicator, it can easily get the current CO2 concentration together with the
ventilation rate. And then adjust the ventilation to the comfort condition automatically by the setting data.
So the over-ventilation of the building can be reduced, and the energy can be saved. The CO2 monitor can
be widely used in the office building, green house, school, exhibition, shopping mall.
The CO2 monitor is easy to use and has many features:
Dual Beam NDIR (Non-Dispersive-Infrared) technology used to measure CO2 concentration.
Three different LED display show the current Indoor Air Quality situation.
Linear analog output (0~10V Voltage, 4~20mA Current) and Relay output based on CO2 Level.
Reliable Sensor provides long-term calibration stability.
The visual and audible alarm function can be adjustable by user.
Mounting bracket with terminal block provides quick easy installation.
CO2 Concentration PPM
Parts Per Million
The current CO2 concentration in your household
Ventilation Rate cfm/p
Cubic Feet
The Present Cubic Feet/Minute Ventilation for
one person.
Ventilation Rate L/P/S
The Current Liter/ Second Ventilation Rate for
one person
The Alarm Setting Icon, the factory setting with
alarm is buzzer off
To calibrate the CO2 sensor when the accuracy
deviates from the actual CO2 concentration
Alarm Level 1
Operation Instruction
Front view
Back view
Alarm Level 2
Recover Factory Setting
Step 1
The 1st Alarm Level
Relay status will invert after CO2 level exceeds
The Buzzer and Yellow LED will work after CO2
level exceeds AL1
The 2nd Alarm Level
Step 4 and Red LED will work after
The Buzzer
level exceeds AL2
To Recover Factory Setting to cancel the
customized setting
Step 2
RJ45 Interface & Wiring Connection
Caution: The RJ45 socket is only for factory calibration use, not for LAN, it was covered by plastic
cover, the incorrect RJ 45 connection will have the risk of circuit damage or irreparable
damage to devices.
COMMON (LVO-/LCO-/RS232 DGND), but COMMON CANNOT connect to power GND.
Safety Instruction
Side view
A. Main LCD Display
B. Green LED Display
( <800ppm)
C. Yellow LED Display
D. Red LED Display
H. Enter Button
I. Screw Position
J. Terminal Block
K. Power Inlet
E. Mode Button
L. RJ 45 Socket
(For factory use
F. Up Button
M. Gas Entry Hole
G. Down Button
﹡RJ 45 Socket including the RS232 and analog output,
Power Inlet is used for factory testing only,and
when using 6VDC,the LCO and LVO will not work。
Warning: Your safety is very important to us .To ensure you use your product correctly and safety,
we would like to your attention to read those warning and the User Manual before using the product.
These Warning provides important safety information and should be observed at all times.
1. Please take the devices lightly, do not subject the product to impact or shock. Otherwise, this
may cause the accuracy drift.
2. Do not immerse the product in water.
3. Please pay attention to the terminal block connection instruction, the wrong mode of operation or
opposite installation will destroy the circuit of the devices.
4. Do not touch the exposed electronic circuitry of the device under any circumstances. Keep the
circuit is close during installation. As there is the danger of electric shock.
5. Please keep the devices away from children touch to avoid the danger or the accident.
6. Do not keep the product under the hot and moisture environment. Keep the product away form
the heat source or near water.
7. Please ensure the screws are fixed on the wall tightly. Do not let the screws approach or close to
the surface of PCB board during installation. It has the risk of circuit damage or irreparable
damage to devices.
Fig1:RJ45 Interface (Side view)
Fig 2: Wiring Connection
Typical Wiring Diagrams
Caring for product
To make sure you receive the maximum benefit from using this product, please observe the follow
1. Cleaning—disconnect the power before clean. Use a damp cloth; do not use the liquid cleaning
agent, such as benzene, thinner or aerosols.
2. Repair----Do not attempt to repair the product or modify the circuitry by yourself. Please contact
with our local dealer time or a qualified repairman if the product needs servicing.
3. Calibration--- Please observe the calibration operation to make sure the accuracy for the devices
when it’s necessary.
4. Air diffusion—The ventilation slots on the housing are designed for CO2 diffusion, so these
ventilation slots should not be blocked.
Installation Step
Step 1: Release the screw from the device, take the front cover off.
Step 2: Release the four screws from the backcover, take the CO2 board from the backcover.
Step 3: Using the screw to fix the backcover to the current outlet, let the wires come out of the hole.
Please pay attention to the terminal block connection data information.
Step 4: Re-assembling the CO2 board by screw to the back cover.
Step 5: After finishing the terminal block wire connection. Press the front cover to the LCD display.
﹡LCO -: Linear, Analog Current Output(-)
LCO +: Linear, Analog Current Output(+)
LVO +: Linear, Analog Voltage Output(+)
LVO -: Linear, Analog Voltage Output(-)
These terminals are only for output, they CANNOT connect to any power source.
The terminal 5, 8 CANNOT connect to the terminal 3 (24VDC GND), otherwise
The device will be burn out.
Customized Settings
When the power has been connected, The CO2 monitor will begin to work. In order to meet you
personal requirement, it is advisable to set up the customizing parameter. Warm Up: It lasts
approximately 1min before WARM UP disappears; all MODE functions will not response during
warm up.
Ventilation Rate:
1. Press the MODE, the speaker icon flashes simultaneously.
2. Press ENTER. Using the Up/Down to set the parameter.
3. Press the ENTER again to save the data.
Remark: There have AL1 & AL2 when you press the mode. You can set the two different levels
on your opinion. The resolution is 100 ppm per times.
Using the ReFactSet Mode:
1. Press up/down to choose the ventilation rate modes.
2. When pressing up button, the LCD display sequence is Vent Rate l/p/s -> Vent Rate cfm/p. When
pressing down button, The LCD display sequence is reverse.
Setting the alarm function:
1. Press MODE, The ReFactSet flashes simultaneously.
2. Press ENTER, Using the Up/Down to select the No/Yes
3. After the slecting, Press the ENTER to save the changes.
Remark: If the user setting the data or calibrate the sensor wrongly. You can use the ReFactSet
(Recover the factory Setting) to come back the factory setting data.
Method - Dual Beam NDIR(Non-Dispersive-Infrared)
Sample Method -Diffusion or flow through (50 ~200 ml/min)
■ Performance - CO2
Measurement Range
0-3,000ppm display
Display Resolution
1ppm at 0~1,000ppm; 10ppm at 1,001~3,000ppm
±75ppm or ±5% of reading whichever is greater
±20 ppm @400ppm
Typ. ±0.2% of reading per °C or ±2 ppm per °C, whichever is
greater, referenced to 25°C
Note: The factory setting with alarm is buzzer off; user can set the alarm on/off according to alarm
function instruction.
0.13% of reading per mm Hg
Setting the Calibration mode:
Response Time
<2min for 90% of step change
Warm-Up Time
<60 seconds at 22°C
Sound Alarm
[email protected]
1. Press the MODE, the speaker icon flashes simultaneously.
2. Press ENTER, use up/down to select the on/off.
3. Press ENTER again to save the setting.
1. Press the MODE ,the CALI icon flashes.
2. Press the ENTER ,CALI show on the display.
3. Adjust the display to the ambient CO2 value by up/down button.
4. Press the MODE morn than 10 sec, CALI flashes. Calibration will be done automatically after about
8 minutes and LCD will display “Pass” or “Fail”. If it shows “Fail”, please try again
Setting the Alarm parameter Mode:
Zone LED Display
Green:<800ppm Yellow:800~1200ppm Red: >1200ppm
Power Supply
18~26VAC RMS 50/60Hz or 18~36VDC (Double insulated,
Full-wave rectifier, no polarity input)
Linear Voltage
Linear Current
4~20mA (Max Load is 500 Ohm)
( Max Load is 400 Ohm while power supply<20 VDC )
Relay Output
30VDC or 250VAC, max 2A ., SPST .Normally Open
Operating Humidity
Storage Temperature
0°C ~50°C (32°F~122°F)
0 ~ 95% RH non-condensing
Notice: Before calibrating, you need standard gas or semi-standard gas; there are 3 methods to get
standard gas.
■ Method A: use CO2 in office/building
-Use two Meters (One is the device for calibration. The other one is a calibrated (new) one.
-Use ambient room gas for calibration in office, waiting at least 10min,until the CO2 reading
doesn’t change
(Notice: user must not breathe toward the CO2 monitor, CO2 from the user will affect the reading
of CO2 monitor)
-Use the reading of the new device as the standard
-Calibrate the device by the Cali Mode instruction .
■ Method B: use CO2 outsides
-Use ambient room gas for calibration outsides, waiting at least 10min,until the CO2 reading
doesn’t change
(Notice: user must not breathe toward the CO2 monitor; CO2 from the user will affect the reading
of ZGw08VRC)
-Use 380~420ppm as the standard reading.
-Calibrate the device by the Cali Mode instruction.
■ Method C: use standard CO2 in the bottle
-Pump the standard CO2 gas (0~1000ppm, flux = 0.1~0.2 liter/min) into the CO2 monitor from
the Gas Entry Hole waiting about 2~3min.
- Calibrate the device by the Cali Mode instruction.
Fault Codes &Troubleshooting Guide
This section includes a list of Frequently Asked Questions for problems you may encounter with the
ZGw08VRC CO2 Monitor.
LCD Fault
of the fault
The ambient temperature has
exceeded the temperature range
0°C to 50°C ( 32°F to 122°F)
This error will disappear when the
temperature returns to the range
between 0°C and 50°C ( 32°F to
some wrong measurement or the
sensor has exceeded its expected
Please unplug the AC adapter and
reconnect it. If the “Er4” always
appears, please contact with the
local dealer.
EEPROM System Problem
Please unplug the AC adapter and
reconnect it. If the “Er5, Er6” always
appear, please contact with the local
Internal Data Transmission Error
Suggested Actions
Please unplug the AC adapter and
reconnected it.
Radiant Innovation Inc. Http://www.ZyAura.com
1F, No.3, Industrial East 9th Road, Science-Based Industrial Park,
HsinChu, Taiwan 300.
-20°C to +60°C (-4°F to 140°F)
Ref. No.:032013
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