AGS Merlin CO2-TFT Dual Power Carbon Dioxide and Temperature Monitor Instruction Manual

Installation & Operation Manual
Merlin CO2-TFT

Merlin CO2-TFT Dual Power Carbon Dioxide and Temperature Monitor

Dual Power Carbon Dioxide & Temperature Monitor

Installation & Operation Manual
Please read this manual carefully and retain for future use.
The Merlin CO2-TFT 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 CO2 gas or temperature reaches alarm state – this device is able to automatically drive ventilation fans reducing CO2 and/or temperature.

CO2-TFT FEATURES

CO2 measured 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 CO2 concentration over 8 hour periods.
 User friendly settings menu.
 Pre-alarm and alarm relay output.
 Fan controller enabled relay output.
 Dual power 100-120VAC or 12-24VAC or DC inputs.
 End of Life and Fault notifications for CO2 sensing element.
 Automatically switch between ventilation programs when gas is used.
 Boost, Mute and Wake Up button.

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 CO2 gas 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; temperature, pressure, the 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.

Quick Installation Arrangement

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.

These recommended heights may vary based on air flow and temperature conditions in addition to the proposed application and location.
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.
   To do this – use a small flat head screwdriver.

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

Do not attempt to remove the Board! This will void any warranty.

Wiring the CO2-TFT |
Mains supply must be connected by a competent person and according to all applicable regulations.
MAINS POWER CONNECTION
100-120V AC Single phase mains power should be supplied to the [POWER/LINE IN] connector (Line/Neutral) and fused at 3A.
The CO2-TFT can also be powered from 12-24V supply – see [12-24V POWER INPUT].

GAS VALVE INPUT
It is possible for your CO2-TFT to receive a signal from a gas solenoid valve via Line & Neutral terminals on our merlin panels when wired parallel. To receive a signal you must configure your CO2-TFT in Natural or Mechanical ventilation mode – see settings for ventilation types.
When gas is supplied/in use – the CO2-TFT will receive a signal from the gas valve and display the [GAS IN USE] message. The CO2-TFT will configure itself automatically to operate under ‘Kitchen ventilation type’ mode and its thresholds 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
This terminal can also connect to a building management system (BMS) or to a Merlin panel to send an alarm signal.

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 / >73.4°F
N/O: <550ppm / <71.6°F

0-10V ANALOGUE OUT 1 & 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 the settings menu and range from 0-5V.
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-TFT with 12-24V power – this should be supplied to the [12-24V POWER INPUT] connector (+ / -).

Settings Switch and Board Buttons
There is a [SETTINGS] switch on the CO2-TFT board. Switch it on to prompt the on-screen menu.

Navigate the settings menu using the buttons on the CO2-TFT circuit board.
[SEL.]

• Scroll through functions (highlighted red).
• Change the desired setting when highlighted.

[OK]

• Highlights setting (red).
• Press to save desired setting.

When changes have been made – turn the SETTINGS switch OFF
Settings Menu Explained
VENT. TYPE

• Natural – (NAT.) Recommended for buildings without mechanical ventilation.
• Mechanical – (MECH.) Recommended for buildings with mechanical ventilation.
• Kitchen – (KITCH.) Recommended for kitchen environments.

MIN 0-10 OUT 1 & 2
Minimum voltage output from 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.

Factory Set Condition

Settings – Optional Configurations
VENT. TYPE
NAT. – Natural Ventilation Type

Green: <1300ppm <73.4°F
Yellow: >1300ppm >73.4°F
Red: >1500ppm >77.0°F
CO2 Pre-alarm relay switch: 1300ppm
CO2 Alarm relay switch: 1500ppm| 0-10V Analogue Output: Linear Progression.
o Min output (1-5V) from 600ppm 73.4°F
o Max output (10V) from 1500ppm 80.6°F
Boost from: 400 – 1499ppm 32°F – 80.4°F
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MECH. – Mechanical Ventilation Type

Green: <800ppm <73.4°F
Yellow: >800ppm >73.4°F
Red: >1000ppm >77.0°F
CO2 Pre-alarm relay switch: 800ppm
CO2 Alarm relay switch: 1000ppm| 0-10V Analogue Output: Linear Progression.
o Min output (1-5V) from 600ppm 73.4°F
o Max output (10V) from 1000ppm 80.6°F
Boost from: 400 – 999ppm 32°F – 80.4°F
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KITCH. – Kitchen/Gas in Use Ventilation Type (Default)

Green: <1500ppm <73.4°F
Yellow: >1500ppm >73.4°F
Red: >2800ppm >77.0°F
CO2 Pre-alarm relay switch: 1000ppm
CO2 Alarm relay switch: 4500ppm| 0-10V Analogue Output: Linear Progression.
o Min output (1-5V) from 600ppm 73.4°F
o Max output (10V) from 2800ppm 80.6°F
Boost from: 400 – 2799ppm 32°F – 80.4°F
Buzzer alarm/ Mute from: >2800ppm
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MIN 0-10 OUT 1
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
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 setto 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 – low
MED – medium
HIGH – high| MIN 0-10 OUT 2
Analogue output minimum voltage.
Select: 0, 1, 2, 3, 4, 5 volt/s
0-10V OUT 2
0-10V analogue output energised by.
Select: CO2 / TEMPERATURE / DUAL
TEMP. UNITS
Temperature measurement
Select: °C Celsius / °F Fahrenheit
FAN ENABLE
Fan switch is energised by. Select:
CO2 (ON >600ppm OFF <550ppm)
TEMPERATURE (ON >73.4°F OFF <71.6°F)
DUAL (Whichever is greatest)
SCREEN SAVER
ON – screen will switch off until temperature
or CO2 levels reach pre alarm/ alarm status.
OFF – screen constantly on.
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Trouble Shooting

Specification

Boost / End of life / Sensor fault / Gas in use / Mute / Average CO2 level
Display| 1.8” TFT – Thin Film Transistor
Screen Brightness| Low, Medium, High
Initial Stabilisation Time| One (1) Minute
Power Supply| 100-120V AC 50-60Hz (Max 2.16VA without load) or 12-24V AC/ DC (25V AC/DC Max)
Gas Valve Input| 100-120V AC
CO2 Pre Alarm Relay Output| Max 0.5A Signal
CO2 Alarm Relay| Max 3A @ 240V
Fan Enable Relay Output| Max 0.5A Signal
Consumption| 2.16 W Max
Internal Fuse| 0.5A / 120V AC
Operating Temp| 32 – 104ºF / 0-95%RH Non-Condensing
Alarm (Buzzer) Sound (dB)| 65 dB (300mm distance in quiet conditions)
CO2 Sensor|
Sensor Type| NDIR. Intelligent Infrared CO2 Module. ABC Logic Auto Calibration
Measuring Range| 400-5000ppm
Accuracy @ 25ºC / 77ºF| ± 100ppm
Gas Sensor Signal Update| Every three seconds
CO2 Average Signal Update| Every ten minutes
Expected Life| 10 Years
Temperature Sensor|
Sensor Type| Linear Active Thermistor Integrated Circuit
Measuring Range| 32-203ºF
Accuracy @ 25ºC / 77ºF| ± 35.6ºF Max
Resolution| 0.1 ºC/ºF
|
Dimensions (H x W x D)| 5.5 x 3.74 x 1.18”
Net Weight| 256g / 9.03oz

OPERATION

First Power Up

On connecting power, the CO2-TFT device enters ‘sensor stabilisation’ phase for approximately 60 seconds – during this period the screen will display an ‘initialisation’ message indicating thatthe device is not yet ready for operation. After the stabilisation period, your monitor will display

a. CARBON DIOXIDE READING. Current CO2 gas 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 device 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 CO2 levels rise above 2800ppm.
f. TOUCH BUTTON is used to activate ‘Boost’ or ‘Mute’ dependant on the status and also to exit screen saver to view the screen for 10 seconds.
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 device 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 BOX. When in Natural or Mechanical mode, this box is left blank when the current CO2 reading is below 550ppm. In Kitchen ventilation mode – this is constantly left blank.
j. AVERAGE CO2 CALCULATION. The monitor will display the average CO2 reading over periods of 8 hours and appear only when current CO2 levels reach or exceed 600ppm in
Natural or Mechanical ventilation type modes only.

Traffic Light Indication
Your device displays both current CO2 and temperature levels in a traffic light style indication.

Thresholds
The thresholds for CO2 will depend upon how your device is configured in the settings menu.
There is no audio alarm for high temperature readings!
Natural Ventilation Type (Factory set condition)

Green: <1300ppm / < 73.4°F
Yellow: >1300ppm / >73.4°F
Red: >1500ppm / >77.0°F| 0-10V Output progress bars:
o Min (1-5V) from 600ppm. 73.4°F
o Max (10V) from 1500ppm. 80.6°F
Boost from: 400 – 1499ppm. 32 – 80.4°F
---|---

Mechanical Ventilation Type

Green: <800ppm / < 73.4°F
Yellow: >800ppm / >73.4°F
Red: >1000ppm / >77.0°F| 0-10V Output progress bars:
o Min (1-5V) from 600ppm. 73.4°F
o Max (10V) from 1000ppm. 80.6°F
Boost from: 400 – 999ppm. 32 – 80.4°F
---|---

Kitchen Ventilation Type (Factory set condition)

Green: <1500ppm / < 73.4°F
Yellow: >1500ppm / >73.4°F
Red: >2800ppm / >77.0°F| 0-10V Output progress bars:
o Min (1-5V) from 600ppm. 73.4°F
o Max (10V) from 2800ppm. 80.6°F
Boost from: 400 – 2799ppm. 32 – 80.4°F
Mute from: 2800ppm for 30mins when Gas Supply On
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Screen Saver
If the screen saver is set to ‘ON’ (see settings), the CO2-TFT device screen will switch off when both CO2 and Temperature levels are at safe levels (green). No readings or messages will be visible during this time.
The screen will exit screen saver mode when either the CO2 or Temperature changes status (yellow or red). To manually exit screen saver press ‘Touch’ button – the screen will remain visible for 10 seconds.
End of Life Indicator
This message indicates that the CO2-TFT gas sensing element 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.

Service & Maintenance
Keep your detector in good working order follow these basic principles;

• DO carefully remove any accumulated dust from the outer enclosure once a month.
• 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.
Our CO2 monitors are designed to automatically recalibrate using background CO2 levels. For maintenance purposes, our monitors should be exposed to fresh air frequently to aid with this recalibration procedure. Coinciding bump tests on a regular basis are also recommended to ensure ongoing accuracy. Inaccuracies that do not resolve over a 24 hour period may require temporary removal of the monitor, from site, for an extended exposure to fresh air.

NOTES

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 CO2 or 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.

Manufacturer’s Warranty
3 Year Warranty
Warranty coverage:
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.
Warranty disclaimers:
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.
Warranty Performance:
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). Any 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 Details
Please pass this manual to the device owner / user.

Date of Installation:|
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Installation Location:|
Organisation:|
Stamp/ Signature of the installer:|
Replacement Date:|

CONTACT US:
AGS Head Office
Tel: 727-608-4375
Fax: 727-538-4237
info@americangassafety.com
American Gas Safety is the owner
of this document and reserves
all rights of modification without prior notice.
AGSCO2TFT-IOM Iss: 3 07-20

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