S&S Northern MERLIN CO2-X Instruction manual

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 1
MERLIN CO2-X
Carbon Dioxide & Temperature Monitor
CO2measured and displayed in parts per million (PPM).
Temperature can be displayed in degrees Celsius (°C) or Fahrenheit (°F).
0-10V Signal Output progress bar display.
Monitor, record and display average CO2concentration over 8 hour periods.
User friendly settings menu.
Pre-alarm and alarm relay output.
Fan controller enabled relay output.
Dual power 100-240VAC or 12-24V.
End of Life notification for CO2 sensing element.
Automatically switch between ventilation programs when gas is used.
Boost, Mute and Wake Up button.

Installation, Operation & Maintenance Manual
Please read this manual carefully and retain for future use.
The Merlin CO2-X is designed to monitor carbon dioxide (CO2) in the air and temperature.
The monitor has a digital traffic light style display indicating the carbon dioxide levels and temperature in
the area. When CO2gas or temperature reaches alarm state –this device is able to automatically drive
ventilation fans reducing CO2and/or temperature.
The information contained within this manual should be referenced for typical installation and operation
only. For specific requirements that may deviate from the information in this guide –contact your supplier.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 2
IMPORTANT WARNING STATEMENTS
Please take the time to thoroughly read this user’s guide which should be retained for future reference.
The expected lifetime of the gas sensor elements is 10 years upon initial power up.
The device will display a message to indicate its end of life and should immediately be replaced.
It is recommended that this device be commissioned upon installation and serviced annually.
Do not apply lighter gas or other aerosols to the device –this will cause extreme damage.
High concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing elements.
This device is designed to monitor carbon dioxide gas and temperature only. It is NOT designed to detect smoke, fire
or other gases and should NOT be used as such.
Never ignore your device when in alarm.
This device requires a continual supply of electrical power –it will not work without power.
This device should not be used to substitute proper installation, use and/or maintenance of fuel burning appliances
including appropriate ventilation and exhaust systems.
This device does not prevent dangerous gasses from occurring or accumulating.
Actuation of your alarm indicates the presence of dangerous levels of CO2or high temperature.
This unit may not fully safeguard individuals with specific medical conditions. If in doubt, consult a doctor/physician.
Your product should reach you in perfect condition, if you suspect it is damaged, contact your supplier.
Three Year Manufacturer’s Warranty
The manufacturer warrants to the original consumer purchaser, that this product will be free of defects in material and
workmanship for a period of three (3) years from date of purchase. The manufacturer’s liability hereunder is limited to
replacement of the product with repaired product at the discretion of the manufacture. This warranty is void if the
product has been damaged by accident, unreasonable use, neglect, tampering or other causes not arising from
defects in material or workmanship. This warranty extends to the original consumer purchaser of the product only.
Any implied warranties arising out of this sale, including but not limited to the implied warranties of description,
merchantability and intended operational purpose, are limited in duration to the above warranty period. In no event shall
the manufacturer be liable for loss of use of this product or for any indirect, special, incidental or consequential
damages, or costs, or expenses incurred by the consumer or any other user of this product, whether due to a breach
of contract, negligence, strict liability in tort or otherwise. The manufacturer shall have no liability for any personal injury,
property damage or any special, incidental, contingent or consequential damage of any kind resulting from gas leakage,
fire or explosion. This warranty does not affect your statutory rights.
During the above warranty period, your product will be replaced with a comparable product if the defective product is
returned together with proof of purchase date. The replacement product will be in warranty for the remainder of the
original warranty period or for six months –whichever is the greatest.
Information on waste disposal for consumers of electrical & electronic equipment.
When this product has reached the end of its life it must be treated as Waste Electrical & Electronics
Equipment (WEEE). WEEE marked products must not be mixed with general household waste, but kept
separate for the treatment, recovery and recycling of the materials used. Please contact your supplier or local
authority for details of recycling schemes in your area.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 3
CONTENTS
INSTALLATION ......................................................................................... 4
Planning................................................................................................................................4
Typical Positioning ..............................................................................................................4
Installation Arrangement ....................................................................................................4
Fixing.....................................................................................................................................5
Board Overview...................................................................................................................5
Wiring your CO2-X..............................................................................................................6
Configuration Settings........................................................................................................8
Menu Overview ...................................................................................................................8
Optional Configurations......................................................................................................9
Factory Set Condition...................................................................................................... 10
Specification ..................................................................................................................... 10
OPERATION ............................................................................................ 11
First Power Up .................................................................................................................. 11
Traffic Light Indicator....................................................................................................... 12
Alarms & Configuration ................................................................................................... 12
Screen Saver Mode ......................................................................................................... 13
End of Life ......................................................................................................................... 13
MAINTENANCE ....................................................................................... 14
Cleaning ............................................................................................................................ 14
Calibration ......................................................................................................................... 14
Testing your CO2-X ......................................................................................................... 14
Notes (blank)..................................................................................................................... 15
Installation Details ............................................................................................................ 16

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 4
INSTALLATION
Planning
Area of coverage
Consider the coverage required and function of the area. Emphasis should be placed on airflow patterns
and correct placement, not perceived detecting ranges. The target gas will only be identified when
contact is made with the sensing element itself.
Your monitor should be installed in populated areas that risk high concentrations of CO2gas or varied
temperatures e.g. educational and government buildings including laboratories and commercial kitchens.
Areas to avoid
Avoid conditions of any other environmental factors that could potentially impede the accuracy and
operation of the detectors such as; condensation; vibration; extreme temperatures, pressure, presence of
other gases, electromagnetic interference and draft zones.
Take in to account the design of the air flow within the zone area. Avoid conditions such as; condensation;
vibration; extreme temperatures and draft zones.
Multiple monitors may be required to adequately protect property and/or persons!
Typical Positioning
Avoid positioning near draft areas (windows and door entrances).
Where possible, monitors must be fixed in such a position as to allow natural air circulation.
Laboratories/educational buildings: Seated head height
Commercial kitchens: 1700mm (5.6ft) from ground level
These recommended heights may vary based on air flow and temperature conditions in addition to the
proposed application and location.
Installation Arrangement

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Rev 3 11-20 5
Fixing
Unpack all the parts!
1. Carefully remove the rear cover from the unit by releasing the two latching clips located at the bottom
of the case.
2. Using the rear cover - mark the screw holes to the wall.
Ensure the wall surface is flat to prevent base distortion.
3. There are two pre-fractured areas for cable entry provided on the inside of the rear cover which may
be cut away as required.
4. After executing the mounting and the connections –replace the rear cover ensuring the two clips are
latched.
5. Make a note of the installation date on the label located on the side of the unit.
Board Overview
Wiring of different circuits shall be separated by means of routing, clamping or barrier!
All wiring is to be installed within flexible tubing to maintain segregation between circuits!
Any damage attempting to remove the circuit board parts may void any warranty!
Any damage to the device whilst installing and making connections may void any warranty!

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 6
Wiring your CO2-X
MAINS POWER CONNECTION
100-240V AC Single phase mains power should be supplied to the
[POWER/LINE IN] connector (Live & Neutral).
The CO2-X can also be powered from 12-24V supply –see [12-24V POWER INPUT].
GAS VALVE INPUT
It is possible for your CO2-X to receive a signal from a gas solenoid valve via Live & Neutral terminals on
our merlin panels when wired parallel.
To receive a signal you must ensure that you configure your CO2-X to Natural or Mechanical ventilation
mode –see settings for ventilation types.
When gas is supplied/in use –the CO2-X will receive a signal from the gas valve and display the [GAS IN
USE] message. The CO2-X will configure itself automatically to operate in ‘Kitchen’ mode until the gas
supply is turned off –see section ‘Settings’ for configuration.
This feature is recommended for teaching areas with gas appliances such as laboratories and food
technology rooms.
CO2 ALARM (Not a mains output)
This terminal can also connect to a building management system
(BMS) or to a Merlin panel to send an alarm signal upon alarm
levels of CO2. This terminal can also switch the Live (energise/ de-
energise) a gas valve upon alarm levels of carbon dioxide.

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Rev 3 11-20 7
CO2 PRE-ALARM
This relay can send a signal to a Building Management System
(BMS) or Merlin panel when CO2 reaches pre-alarm level.
FAN ENABLE
The [FAN ENABLE] relay output can be connected to a fan switch
which can energise fans via a signal.
This relay will switch on a fan from the current CO2 level only, by
current temperature only or by the status of both (whichever is
greatest) as follows:
N/C: >600ppm / >23°C (73.4°F)
N/O: <550ppm / <22°C (71.6°F)
These levels cannot be altered.
0-10V ANALOGUE OUT 1 & OUTPUT 2
These connections are used to regulate external fan speed
controllers (supplied separately). Connect direct to fan speed
controllers or via your Merlin panel [0-10V] terminal if available.
Minimum voltage output can be configured in settings menu from 0
to 5 volts.
0-10V output can be driven by the status of current CO2 level only,
by current temperature only or by the status of both levels
(whichever is greatest).
12-24V POWER
To power the CO2-X with 12-24V power –this should be supplied
to the [12-24V POWER INPUT] connector (+ / -).
This connection can be either AC or DC.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 8
Configuration Settings
There is a settings switch on the CO2-X board.
Switch it on to prompt the on-screen menu.
Navigate the menu using the buttons on the board.
When changes have been made –turn the settings switch off.
[SEL.] button
Scroll through functions (highlighted red).
Change the desired setting when highlighted.
[OK] button
Highlights setting (red).
Press to save desired setting.
Menu Overview
VENT. TYPE
NAT. (Natural mode) –Recommended for buildings without mechanical ventilation.
MECH. (Mechanical mode) –Recommended for buildings with mechanical ventilation.
KITCH. (Kitchen mode) –Recommended for kitchen environments.
MIN 0-10 OUT 1 & 2
Minimum voltage output from the 0-10V Analogue out 1 & 2 terminals.
0-10V OUT 1 & 2
0-10V output can be driven by current CO2 ppm level only, by current temperature only or by the status of
both –whichever is the greatest.
BUZZER
The buzzer will operate as selected in KITCHEN ventilation type only. You can select the buzzer to beep
three times every 15 seconds, every 10 minutes or not at all when the alarm status is reached.
TEMP. UNITS
Select between measuring the temperature in degrees °Celsius or °Fahrenheit.
BOOST (MIN.)
Analogue outputs will run at optimum capacity (10V) for time specified.
Select from 1 –10 minutes. Outputs return to normal after the specified boost time.
FAN ENABLE
This relay will switch on a fan from the current CO2 level only, by current temperature only or by the status
of both –whichever is the greatest.
BRIGHTNESS
There are three (3) levels of screen backlight brightness: LOW, MED and HIGH.
SCREEN SAVER
If ON is selected, the display will remain off and wake up at pre-alarm/ alarm status. To wake up the
screen for ten seconds press the touch button. If OFF is selected the display will remain on.
FACTORY RESET
Restores all settings to factory set condition.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 9
Optional Configurations
NAT. - Natural Ventilation Mode
Green: <1300ppm <23 °C/ 73.4°F
Yellow: >1300ppm >23 °C/ 73.4°F
Red: >1500ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 1300ppm
CO2 Alarm relay switch: 1500ppm
0-10V Analogue Output: Linear Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 1500ppm 27 °C/ 80.6°F
Boost from: 400 - 1499ppm 0°C/32°F –26.9°C/ 80.4°F
MECH. - Mechanical Ventilation Mode
Green: <800ppm <23 °C/ 73.4°F
Yellow: >800ppm >23 °C/ 73.4°F
Red: >1000ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 800ppm
CO2 Alarm relay switch: 1000ppm
0-10V Analogue Output: Linear Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 1000ppm 27 °C/ 80.6°F
Boost from: 400 - 999ppm 0°C/32°F –26.9°C/ 80.4°F
KITCH. –Kitchen/Gas in Use Ventilation Mode
Green: <1500ppm <23 °C/ 73.4°F
Yellow: >1500ppm >23 °C/ 73.4°F
Red: >2800ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 2800ppm
CO2 Alarm relay switch:4500ppm
0-10V Analogue Output: Linear Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 2800ppm 27 °C/ 80.6°F
Boost from: 400 - 2799ppm 0°C/32°F –26.9°C/ 80.4°F
Buzzer alarm/ Mute from: >2800ppm
MIN 0-10 OUT 1
Analogue output minimum voltage.
Select: 0, 1, 2, 3, 4, 5 volt/s
MIN 0-10 OUT 2
Analogue output minimum voltage.
Select: 0, 1, 2, 3, 4, 5 volt/s
0-10V OUT 1
0-10V analogue output energised by.
Select: CO2 / TEMPERATURE / DUAL
0-10V OUT 2
0-10V analogue output energised by.
Select: CO2 / TEMPERATURE / DUAL
BUZZER
Kitchen Vent Type Mode
CO2 >2800ppm Only. Select:
ON –3 beeps every 15 seconds
10MINS –3 beeps every 10 minutes
OFF
BOOST (MIN.)
Analogue outputs at optimum voltage
(10V) for number of minutes. Boost can only be
activated if either analogue outputs is set to CO2
or DUAL mode only.
Select: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 minute/s
BRIGHTNESS
Brightness of the screen display. Select:
LOW / MEDIUM / HIGH
TEMP. UNITS
Temperature measurement
Select: °C Celsius / °F Fahrenheit
FAN ENABLE
Fan switch is energised by. Select:
CO2 (ON >600ppm OFF <550ppm)
TEMPERATURE (ON >23°C OFF <22°C)
DUAL (Whichever is greatest)
SCREEN SAVER
ON –screen will switch off until temperature or
CO2levels reach pre alarm/ alarm status.
OFF –screen constantly on.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 10
Factory Set Condition
VENT. TYPE
KITCH.
BUZZER
ON
SCREEN SAVER
OFF
MIN 0-10 OUT 1
1
TEMP. UNITS
°C
MIN 0-10 OUT 2
1
BOOST (MIN.)
1
0-10V OUT 1
TEMP
FAN ENABLE
CO2
0-10V OUT 2
CO2
BRIGHTNESS
MED
FACTORY RESET
Specification
Product:
Dual Power Carbon Dioxide & Temperature Monitor
Model:
CO2-X
Visual Indicators
CO2gas level / Temperature level / Measurement value / Boost /
End of life / Sensor fault / Gas in use / Mute / Average CO2level
Display
1.8” TFT –Thin Film Transistor
Screen Brightness
Low, Medium, High
Initial Stabilisation Time
One (1) Minute
Power Supply
100-240V AC 50-60Hz (Max 2.16VA without load) or
12-24V AC/ DC (25V AC/DC Max)
Gas Valve Input
100-240V AC
CO2 Pre Alarm Relay Output
Max 0.5A Signal
CO2Alarm Relay
Max 3A @ 240V
Fan Enable Relay Output
Max 0.5A Signal
Consumption
2.16 W Max
Internal Fuse
0.5A / 250V AC
Operating Temp
0 –40°C / 0-95%RH Non-Condensing
Alarm (Buzzer) Sound (dB)
65 dB (300mm distance in quiet conditions)
CO2 Sensor
Sensor Type
NDIR. Intelligent Infrared CO2Module. ABC Logic Auto Calibration
Measuring Range
400-5000ppm
Accuracy @ 25°C / 77°F
± 100ppm
Gas Sensor Signal Update
Every three seconds
CO2Average Signal Update
Every ten minutes
Expected Life
10 Years
Temperature Sensor
Sensor Type
Linear Active Thermistor Integrated Circuit
Measuring Range
0-95 °C / 0-203°F
Accuracy @ 25°C / 77°F
± 2°C
Resolution
0.1 °C/°F
Dimensions (H x W x D)
140 x 95 x 30mm / 5.5 x 3.74 x 1.18”
Net Weight
256g / 9.03oz

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 11
OPERATION
First Power Up
On connecting power, the CO2-X monitor enters a stabilisation phase for approximately 60 seconds –
during this period, your device not yet ready for operation.
a. CARBON DIOXIDE READING. Current CO2gas level in parts per million (ppm).
b. 0-10V ANALOGUE OUTPUT PROGRESS BARS. 0-10V analogue outputs 1 and 2.
c. FLAME ICON appears only when the CO2-X receives a signal from a gas valve and gas supply is
open/on and set to Natural or Mechanical Ventilation Type mode.
d. BOOST ON message appears when BOOST is activated - press and hold the touch button (f) for
three (3) seconds. The analogue outputs will run at optimum voltage (10V) for a pre-set number of
minutes. Boost can only be activated if either analogue outputs is set to CO2 or DUAL mode only.
e. MUTE message appears when the touch button (f) is pressed. The audible alarm buzzer must be set
to on or every 10 minutes and can only occur when gas is in use or KITCH. Ventilation mode is
selected and when CO2levels rise above 2800ppm.
f. TOUCH BUTTON used to activate ‘Boost’ or ‘Mute’ dependant on the status and also to view the
screen for 10 seconds during screen saver mode.
g. TEMPERATURE READING. Current temperature in degrees Celsius or Fahrenheit. The temperature
will increase its accuracy over a 30 minute period upon power up.
h. GAS IN USE MESSAGE appears only when the CO2-X receives a signal from a gas valve and gas
supply is open/on. When the gas valve is closed, this message will not be displayed. Appears with
Flame icon.
i. BLANK (Natural or Mechanical mode), this is left blank when the current CO2reading is below
550ppm. In Kitchen ventilation mode –this is constantly left blank.
j. AVERAGE CO2CALCULATION. The monitor will display the average CO2reading over periods of 8
hours and appear only when current CO2levels reach or exceed 600ppm in Natural or Mechanical
ventilation type modes only.

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Traffic Light Indicator
Your CO2-X displays both current CO2and temperature levels in a traffic light style indication.
Alarms & Configuration
The alarm thresholds and configuration will depend on which ventilation mode your CO2-X has been set
to. There is no audio alarm for high temperatures!
NAT. - Natural Ventilation Mode
Green: <1300ppm <23 °C/ 73.4°F
Yellow: >1300ppm >23 °C/ 73.4°F
Red: >1500ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 1300ppm
CO2 Alarm relay switch: 1500ppm
0-10V Analogue Output Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 1500ppm 27 °C/ 80.6°F
Boost from: 400 - 1499ppm 0°C/32°F –26.9°C/80.4°F
MECH. - Mechanical Ventilation Mode
Green: <800ppm <23 °C/ 73.4°F
Yellow: >800ppm >23 °C/ 73.4°F
Red: >1000ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 800ppm
CO2 Alarm relay switch: 1000ppm
0-10V Analogue Output Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 1000ppm 27 °C/ 80.6°F
Boost from: 400 - 999ppm 0°C/32°F –26.9°C/80.4°F
KITCH. –Kitchen/Gas in Use Ventilation Mode (Default)
Green: <1500ppm <23 °C/ 73.4°F
Yellow: >1500ppm >23 °C/ 73.4°F
Red: >2800ppm >25 °C/ 77.0°F
CO2 Pre-alarm relay switch: 2800ppm
CO2 Alarm relay switch:4500ppm
0-10V Analogue Output Progression.
oMin output (1-5V) from 600ppm 23 °C/ 73.4°F
oMax output (10V) from 2800ppm 27 °C/ 80.6°F
Boost from: 400 - 2799ppm 0°C/32°F –26.9°C/80.4°F
Buzzer alarm/ Mute from: >2800ppm
SAFE
Safe CO2 levels or temperature
will be displayed GREEN.
ATTENTION!
Low CO2levels or temperature
will be displayed YELLOW.
DANGER!
High CO2levels or temperature
will be displayed RED.

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Rev 3 11-20 13
Screen Saver Mode
If the screen saver mode is switched on (see settings), the CO2-X monitor screen will switch off when
both CO2and Temperature levels are at safe levels (green). No readings or messages will be visible
during this time. The screen will exit screen the saver mode when either the CO2or Temperature changes
status (yellow or red).
To view the screen during this mode, press the touch button, the screen will be visible for 10 seconds.
End of Life
This message indicates that the CO2-X monitor has reached its expected operational lifecycle.
No gas or temperature levels will be displayed. The expected lifetime is 10 years.
Contact your supplier and replace the unit immediately.
The expected lifecycle of 10 years may vary depending on environmental conditions.

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 14
MAINTENANCE
Cleaning
Keep your detector in good working order follow these basic principles;
Carefully remove any accumulated dust from the outer enclosure using a slightly damp cloth.
Never use detergents or solvents to clean your device –this may permenantly or temporarily
damage the gas sensing elements.
Never spray air fresheners, hair spray, paint or other aerosols near the device.
Never paint the device. Paint will seal vents and interfere with the device.
High concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing
elements –such as; wine; deodorants; stain removers; thinners etc.
Auto-Calibration
Our CO2sensors are designed to automatically recalibrate using background CO2levels ±75ppm.
For maintenance purposes, the device should be exposed to fresh air intermittently to aid with this
process. Inaccuracies that do not resolve over a 24 hour period may require temporary removal of the
device, from site, for an extended exposure to fresh air.
Testing your CO2-X
The aim of the test is to make sure the CO2-X is working at its optimum by briefly exposing a level of
carbon dioxide to send the device into an alarm state ensuring all system outputs/relays activate, then it is
working safely. If the system fails to operate as intended in an alarm state, the device must not be used
until a full inspection and service has been conducted. To do this, simply breathe near or into the device.
QUICK TIPS
To increase reaction time, cover the escape vents.
Alternatively, enclose the device and apply gas i.e. in an air tight bag or container.
Always give at least five (5) minutes between testing the same unit.
If in doubt, contact your supplier.

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Notes (blank)

Installation, Operation & Maintenance Manual CO2-X
Rev 3 11-20 16
Installation Details
Please pass this manual to the system owner / user.
Date of Installation:
Installation Location:
Organisation:
Stamp/ Signature of the installer:
Replacement Date:
S&S Northern Head Office
Tel: [phone]
Fax: [phone]
www.snsnorthern.com
[e-mail]
South East Division
Tel: [phone]
Fax: [phone]
[email protected]
S&S Northern is the owner of this document and reserves all rights of modification without prior notice.