AGS Merlin 2000S User manual

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 1
Merlin 2000S
Gas Proving and Ventilation interlock system

Installation & Operation Manual
Please read this manual carefully and retain for future use.
This panel is designed for use when the kitchen appliances do not have flame failure devices fitted, therefore gas
proving is a requirement.
The Merlin 2000S system acts as an interlock between the ventilation system and the gas solenoid v alve. The
system is compatible with both current monitors and air pressure differential switches in order to interlock with up
to 4 fans.
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 Manual Merlin 2000S
Rev: 10 02-21 2
Contents
IMPORTANT WARNING STATEMENTS ......................................................3
Installation...................................................................................................4
Planning ...................................................................................................................... 4
Fixing - Mounting......................................................................................................... 4
Typical Installation Arrangement................................................................................. 5
Terminal Connections ................................................................................................. 5
Switch Settings ........................................................................................................... 7
Specification................................................................................................................ 8
Operation ....................................................................................................9
First Power Up............................................................................................................. 9
Emergency Shut Off Button ........................................................................................ 9
LED Indicators ............................................................................................................. 9
CO2Mode.................................................................................................................. 10
Maintenance..............................................................................................11
Cleaning.................................................................................................................... 11
Bump Test (Gas Response Check) ........................................................................... 11

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 3
IMPORTANT WARNING STATEMENTS
Please take the time to thoroughly read this user’s guide which should be retained for future reference.
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.
Non-continuous (intermittent) operation will not affect performance.
Actuation of alarms indicates the presence of a danger.
Your product should reach you in perfect condition, if you suspect it is damaged, contact your supplier.
Manufacturer’s 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.
Alternatively, all AGS products can be securely packaged and returned clearly marked for disposal.

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 4
Installation
Planning
This panel is designed for use when the kitchen appliances do not have flame failure devices fitted,
therefore gas proving is a requirement.
The Merlin 2000S system acts as an interlock between the ventilation system and the gas solenoid
valve. The system is compatible with both current monitors and air pressure differential switches in
order to interlock with up to 4 fans.
The fans can be monitored through air pressure switches or by means of an additional current monitor.
To operate the Merlin 2000S the fans should be turned to the ‘on’ position, once the panel receives a
signal to indicate the fans are operating the key on the panel can be turned to the ‘on’ position and this
will open the gas solenoid valve. If the fans should fail, the ‘fan fail’ LED on the panel will illuminate and
the gas solenoid will close.
The Merlin 2000S can work in conjunction with carbon dioxide, natural gas, carbon monoxide and
LPG sensors.
Please refer to your detector manual for important information regarding coverage, location and
positioning including areas and conditions to avoid.
Fixing - Mounting
Place the panel 48-60 inches above finished floor level.
Unpack all the parts!
Designed for surface mounting, it must be installed by a
licensed, insured contractor.
1. Carefully remove the front cover from the unit by
unscrewing the four bolts located at each corner.
To do this –use the socket wrench provided.
2. Mark the four screw holes located on the back of the enclosure to the wall. Ensure the wall surface is
flat to prevent base distortion.
3. After executing the mounting and the connections –replace the front cover and insert the security
caps over the four bolts.
Take care when making connections to high voltage connectors!
Any damage attempting to remove the circuit board may void any warranty!
All Class 2 wiring is to be installed within flexible tubing to maintain segregation between circuits!
Wiring of different circuits shall be separated by means of routing, clamping or barrier!
A flush mount kit is available, comprising of a mounting bracket and decorative surround strip. Contact
your supplier for more information.

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 5
Typical Installation Arrangement
Terminal Connections
1. POWER / LINE IN
110-120V AC Power should be supplied to the [POWER / LINE IN] terminal and fused at 3A.
On connecting the mains supply to the panel the power LED indicator will light up –this is located on the
front cover (American Gas Safety Logo).
2. GAS SOLENOID VALVE OUTPUT
110-120V AC electrical power supplied from the [VALVE OUT] connector using a 3 core cable can be
connected to a gas solenoid valve which can shut the gas supply on alarm status.
Refer to your valve manual for more information and wiring!
3. SUPPLY & EXTRACT FAN PRESSURE DIFFERENTIAL SWITCHES / CURRENT MONITORS
These terminals are used to receive an input signal from external air pressure switches or external
current monitors. These terminals have factory fitted links installed.
If only one fan is being used –leave factory fitted links in terminals NOT IN USE!

Installation & Operation Manual Merlin 2000S
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4. BMS OUTPUT
Connections are available on the board for Building Management Systems.
[NO Normally Open] [COM Common] [NC Normally Closed]
These are volt free connections.
This is a relay that changes state in alarm or when the gas is on/off and can be used in conjunction with
the 12V DC output and other external relays that affect other devices and controls such as purge fans
and audible alarms etc.
See section; Switch Settings - for BMS options
5. PRESSURE SENSOR
The pressure sensor is wired to the [PRESSURE SENSOR] connector and screwed into the downstream
port of the gas solenoid valve.
Connect the pressure sensor as shown:
Red [+] Black [-] Blue [IN]
The sensor will monitor the gas supply pressure and if pressure drops below 0.17psi –the
gas valve will close as this could mean a gas leak is present.
The pressure sensor operating pressure is: 0 –1.45psi.
6. EM REMOTE
Connections for remote emergency shut-off or stop buttons is detailed on the circuit board as [EM
REMOTE]. This is linked out as a factory setting.
Remote emergency shut-off buttons should be volt free and wired to the Merlin 2000S using a plenum
security cable, white, 18/2 (18AWG 2 conductor), stranded, CMP or similar.
7. GAS DETECTOR
Connections can be made for a Merlin gas detector (LPG, NG, CO or Hydrogen).
If no detector is being used leave the factory fitted link in.
A wiring example is shown.
Refer to your gas detector manual for further information.
8. FAN SWITCHES
This terminal switches when the key is turned on and off.
This can be connected to a fan switch (supplied separately) which can provide power to fans when the
control panel is switched on.
9. CO2 MONITOR
This terminal can be used to connect a Merlin CO2monitor to shut off the system in the event of a high
concentration of CO2. If no CO2 monitor is connected, the panel will ‘beep’ upon power up and the CO2
LED will flash 3 times to indicate that this terminal has been disabled.
An external power supply is required. Refer to your CO2monitor manual for further information.
10. 12V DC
This is a power output for external auxiliary devices when there is power at the panel and can be used to
create a relay switch with the BMS relay output.
Max output: 50mA

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 7
Switch Settings
Building Management System Integration
There is a DIP-switch located on the circuit board labelled [BMS SEL].
The panel can be integrated with a BMS to make or break a circuit when the gas is either on or off,
(valve open or valve closed). This will tell the BMS whether or not power is being sent to the solenoid
valve.
OFF
Signals the BMS when gas is on or gas is off. (Default)
ON
Signals the BMS on a fault, i.e. high gas levels detected, emergency shut-off activated, etc.
Fan Switch Integration
There is the facility to connect a Fan Switch.
A fan switch (Merlin FS1 or FS2 - sold separately) provides the facility to turn on fan(s) when the 2000S
panel is switched on and removes power to fan(s) when the switched off.
There is a switch located on the circuit board labelled [EM SEL].
OFF
Instructs the system to shut down fan(s) and gas supply upon activation of emergency shut
off button(s). (Default)
ON
Instructs the system to leave the fans on and shut off the gas supply only upon activation of
emergency shut off button(s).
This option is not available if a Fan Switch is not installed.
Fire Panel Integration
The Merlin 2000S can be integrated with a fire alarm to close the gas supply automatically in the event
of a fire. The volt free fire alarm signal can be wired in series with any remote emergency shut off
buttons. If there are no remote emergency shut off buttons being installed, wire this directly to the
terminal marked [EM REMOTE].
Gas Fill Time and Prove Time
FILL TIME: Amount of time the gas valve opens to fill the gas line on power up or reset.
PROVE TIME: Amount of time the system tests the gas line for leaks on power up or reset.
There are two switches located on the circuit board labelled [FILL TIME] and [PROVE TIME].
FILL TIME
PROVE TIME
OFF
5 Seconds (Default)
OFF
30 Seconds (Default)
ON
10 Seconds
ON
50 Seconds
Once the settings have been changed - remove power for 10 seconds.

Installation & Operation Manual Merlin 2000S
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CO2MODE
Under normal working conditions the Merlin 2000S monitors the ventilation and the concentration level
of Carbon Dioxide (CO2) in the air.In the event of ventilation failure or if the CO2level is at alarm level,
the panel will shut off the gas supply.
The Merlin 2000S features a ‘CO2Mode’ - this allows the user to have the access to the gas supply in
the event of a fan failure. The ‘CO2Mode’ button located on the front of the panel will only be available to
use when ‘Fan fault’ LED illuminates Red. To enable the CO2Mode, this button has to be pressed for 5
seconds. The Fan Fault LED will go off and CO2Mode LED will come on.
In this mode, the Merlin 2000S will monitor only the CO2levels to ensure there is a safe working
environment. This mode will allow the gas valve to open for 8 hours each time the system is energised,
provided there are satisfactory levels of CO2.
At the end of 8 hours, the gas valve will close and CO2 Mode LED will be flashing.
To reinstate the system the panel has to be restarted.
CO2 Mode will be permanently disabled if a CO2 monitoring device is not connected.
Specification
Model:
2000S
Visual Indication
LED
Mains Electrical Power Input
110-120VAC
Gas Solenoid Valve Output
110-120VAC
Current Consumption
12W max (50mA) @ 120VAC
Internal Fuse
3.15A
Pressure Sensor Operating Pressure
0 -1.45psi
Operating Temperature
32 –104°F 0-95%RH Non-Condensing
Audible Alarm Buzzer dB
65 dB (300mm distance in quiet conditions)
Internet connection
N/A
Housing Material
Polylac PA-765
Flame Rating
UL 94
UL Approval Reference
E464760
O/All Dimensions (H x W x D) mm / inch
7.08 x 10 x 3.03”

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 9
Operation
First Power Up
On connecting mains power, an LED on the front of the panel (AGS Logo) will illuminate red.
1. Turn off all appliances
2. Turn the Fans On.
3. Turn the key switch to ON position. See LED indicators.
To turn the system off, turn the key switch to OFF position.
Emergency Shut Off Button
The emergency shut off button is located on the front of the panel.
There is also a facility for remote shut off buttons to be wired in series on the circuit board.
The emergency shut off button(s) will cut off the gas supply and electrics only when activated.
To reinstate the system, the emergency shut off button(s) will need to be reset and the panel restarted.
LED Indicators
Gas On
When the fans are running and the key switch is turned on, the Merlin 2000S will open the gas valve and
the Gas-On LED will illuminate.
ON = Gas On / OFF = Gas Off
Testing
This LED will illuminate for approximately 30 seconds when the panel is checking the integrity of the gas
installation upon start up.
ON = proving the gas line, do NOT operate any appliances during the testing period.
Test Fail
Under normal working conditions this LED is off.
When the panel detects a gas leak on start- up, the LED will illuminate and the gas valve will remain
closed.
OFF = OK / ON = gas proving test failed
Pressure Low
Under normal working conditions the LED is off.
The LED will illuminate when the incoming gas pressure drops below 0.17psi for 10 seconds and the gas
valve will close.
OFF = OK / ON = gas supply pressure low.
Supply Fans
Under normal working the LED will illuminate.
If a supply fan fault is detected, the LED will flash.
ON = OK / *FLASHING = One of the supply fans is not running.

Installation & Operation Manual Merlin 2000S
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Extract Fans
Under normal working the LED will illuminate.
If an extract fan fault is detected, the LED will flash.
ON = OK / *FLASHING = One of the extract fans is not running
*IF SUPPLY AND/OR EXTRACT FANS LED FLASHES FOR MORE THAN 20 SECONDS, THE GAS WILL SHUT OFF.
Fan Fault
Under normal working conditions this LED is off.
If a fan fault is present for more than 20 seconds, the LED will illuminate RED.
OFF = OK / ON = the gas supply has been shut off due to a ventilation fault.
EM Stop
If an emergency shut off button (either remote or on the panel) is pressed, the LED will illuminate and
the gas is shut off. The button(s) must be re-set before restarting the system.
OFF = OK / ON = Emergency Shut Off button pressed
Gas Detected
Under normal working conditions this LED is off.
If an external Merlin detector connected detects high levels of gas this LED will illuminate and the Gas
valve will turn off.
OFF = OK / ON = Gas detected.
CO2High
Under normal working conditions this LED is off.
If the concentration of Carbon Dioxide (CO2) in the air is at alarm level (CO2 Monitors sold
separately), the LED will show illuminate and the Gas valve will turn off.
OFF = OK / ON = the concentration of CO2is at alarm level.
CO2Mode
The ‘CO2Mode’ button located on the front of the panel will only be available to use when ‘Fan fault’ LED
illuminates. To enable CO2Mode, this button has to be pressed for 5 seconds. The Fan Fault LED will go
off and CO2Mode LED will come on. In this mode, the Merlin 2000S will monitor only the CO2levels to
ensure there is a safe working environment and allow the gas valve to open for 8 hours each time CO2
Mode is activated provided CO2levels are safe.
At the end of 8 hours, the gas valve will close and CO2 Mode LED will be flashing.
To reinstate the system the panel has to be restarted.
CO2 Mode will be permanently disabled if a CO2 monitoring device is not connected.

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 11
Maintenance
Cleaning
To keep your control panel in good working order - follow these basic principles;
Remove any dust/debris from the outer enclosure regularly using a slightly damp cloth.
Never spray air fresheners, hair spray, paint or other aerosols near gas detecting devices.
Never paint the device.
It is recommended that any detectors connected to the system are inspected and serviced at least
annually from the date of installation for optimum performance and protection.
Bump Test (Gas Response Check)
What is a Gas Response Check?
Response checks are often referred to as a ‘BUMP TEST’. Bump tests are important to make sure a gas
detection device is able to detect a release of gas as early as possible.
The aim of the bump test is to make sure a gas detector is working at its optimum by briefly exposing the
unit to a known concentration of the target gas that exceeds the highest alarm point. If the detector goes
into alarm and all system outputs/relays activate, then it is working safely.
If the system fails to operate as intended in an alarm state, the gas detector must not be used until a full
inspection and service has been conducted.
Why is it important?
A detector may visually appear in good working order, but its sensitivity can be inhibited by external
factors. Dust, humidity, temperature fluctuations, cleaning products, contaminants or sensor drift
(ageing) can cause a decline in sensitivity and eventual failure.
Regular bump tests are important to make sure the detector is able to detect a release of gas as early as
possible.
How often should I Bump Test a detector?
Regular bump tests are important to make sure the detector is able to detect a release of gas as early as
possible. A bump test usually takes seconds (gas type dependant) and is often completed alongside a
scheduled fire alarm test, however the frequency should be determined following a risk assessment by
the end user. Remember, bump testing does not remove the need to have gas detectors inspected,
calibrated and serviced periodically by a trained personnel.
What equipment do I need to perform a Bump Test?
Contact your AGS representative for details of suitable bump testing kits and gases.
Kits usually consist of a certified gas cylinder; flow control regulator, tube pipe and applicator cone.

Installation & Operation Manual Merlin 2000S
Rev: 10 02-21 12
Installation Details
Please pass this manual to the system owner or system user.
Date of Installation:
Installation Location:
Organisation:
Stamp/ Signature of the installer:


American Gas Safety LLC
Head office:
6304 Benjamin Road, Suite 502, Tampa, FL 33634
Tel: [phone]
[email protected]om
American Gas Safety LLC is the owner of this document and reserves all rights of modification without prior notice.