AGS Merlin GDP2X User manual

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 1
Merlin Gas Detection Panel: GDP2-X
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Installation & Operation Manual
Please read this manual carefully and retain for future use.
American Gas Safety provide a range of detection panels which can be used in many applications such
as factories, car parks, shopping malls and most commonly for this model - boiler houses.
The GDP2X can be used with up to eight Merlin gas detectors (sold separately) for monitoring and
detecting gas including carbon monoxide, liquid petroleum gas and methane.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 2
CONTENTS
INSTALLATION..............................................................................................3
Planning ............................................................................................................................. 3
Quick Installation Arrangement .................................................................................... 3
Fixing ................................................................................................................................... 4
Board Overview - Main ................................................................................................... 4
Wiring the GDP2X ............................................................................................................. 5
Settings Switch .................................................................................................................. 8
Settings Menu ................................................................................................................... 9
Settings Options Explained ............................................................................................. 9
Factory Set Condition ..................................................................................................... 9
Trouble Shooting............................................................................................................... 9
Specification ................................................................................................................... 10
OPERATION.................................................................................................11
First Power Up .................................................................................................................. 11
Main Screen .................................................................................................................... 11
Zone Screens................................................................................................................... 11
Alarm Messages ............................................................................................................. 12
Alarm Message List ........................................................................................................ 12
Servicing & General Maintenance............................................................................. 13
Bump Testing ................................................................................................................... 14
IMPORTANT WARNING STATEMENTS......................................................15
Manufacturer’s Warranty ............................................................................................. 15
Installation Details .......................................................................................................... 16

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 3
INSTALLATION
Planning
The Merlin GDP2X is a two zone gas detection panel which can be used in many applications
such as factories, car parks, shopping malls and most commonly - boiler houses.
It can be used with up to eight Merlin gas detectors (model X) for monitoring and detecting gas
including carbon monoxide, liquid petroleum gas and methane.
The GDP2X system can be integrated with, but not limited to, a BMS (building management
system) a fire panel, external alarms and remote emergency shut-off buttons.
Locations for detectors will vary based on the intended application and target gas, they should
be located near identified sources of a potential gas leaks/ pockets where hazardous gas could
quickly accumulate and areas of identified consequential risk.
The composition of the target gas and its density relative to air are used as the basis for any
recommended height of sensors.
Generally, the installation height of a sensor for a heavy gas (such as propane) would be close
to the lowest point in the area, and for a light gas (such as methane) would be close to the
highest point in the area.
Any recommended heights may vary based on air flow and temperature conditions in addition
to the proposed application and location –this is particularly apparent with oxygen depletion
sensors, and the target gas that they are used for.
Quick Installation Arrangement
Placing the GDP2X at eye level allows for optimum monitoring of the display screen.
Please refer to your detector manual for important information regarding coverage, location
and positioning including areas and conditions to avoid.
For applications where gas monitoring may exceed 100 yards from one control panel –
Contact your supplier.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 4
Fixing
Unpack all the parts!
1. Carefully remove the front cover and board 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.
Board Overview - Main
Be careful when creating access for cables –Damage to boards will void any warranty.
To avoid electrical shock you must
always isolate the mains supply before
opening the GDP2X panel cover/s.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 5
Wiring the GDP2X
MAINS POWER CONNECTION
100-120V AC mains power should be supplied to the [POWER/LINE IN] connector using a 3 core
cable 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 (red dot on the AGS Logo).
VALVE OUTPUT
100-120V 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!
GAS DETECTORS
A 12-24V power and data supply to gas detectors are wired to [DETECTOR CHAIN] connectors.
Always power down the panel when
wiring external circuits to prevent
damage to electronics.
Mains supply must be connected by a
competent person and according to
any regulations.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 6
12-24V power and data supply from your GDP2X [DETECTOR CHAIN] to [DETECTOR X CHAIN] can
be wired in any configuration. i.e. [IN/IN] [OUT/OUT] [IN/OUT] [OUT/IN] etc.
MULTIPLE DETECTOR CHAIN SYSTEM - TYPICAL EXAMPLES
DETECTOR –ID SETUP.
When wiring multiple model ‘X’ detectors to
the GDP2X range it is important to identify
each detector and in which monitoring zone
the detector is located - for the GDP2X system
to receive and display data.
ID switches are fitted to detector circuit boards.
The diagram opposite shows how to configure
switches for each detector and is also printed
onto the detector circuit boards for quick
reference.
Refer to your detector manual.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 7
DETECTOR CHAIN TERMINATION
Example 1.
Example 2.
FIRE PANEL
The terminal for fire alarms is detailed on the circuit board as [FIRE PANEL].
HEAT SENSOR
The terminal for heat sensors/ thermal
links is detailed as [HEAT SENSOR].
EM STOP
Connections for remote emergency
shut-off or stop buttons is detailed on
the circuit board as [EM STOP].
These terminals are volt free and fitted
with links to represent a closed circuit.
DETECTOR Chain Termination Resistor Switch
Signal communication issues may occur where the bus length is too long or high baud rates
are used. In this instance –terminating at each end of the chain may help the quality of the
data signal. To do this - turn on the [CHAIN TERMINATION RESISTOR] switches shown below.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 8
BMS OUTPUT
Connections are available on the board
for Building Management Systems.
[NO] [COM] [NC]
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 24V DC output and other external relays that affect other devices and
controls such as purge fans and audible alarms etc.
SOUNDER-STROBE
There are connections for an external
sounder alarm/ strobe lighting to
activate on alarm.
Refer to your sounder/ strobe manual for
wiring.
Settings Switch
On the front fascia circuit board you’ll find a SETTINGS dip-switch –when switched to ON, the
screen will display the settings menu –you can now configure your GDP2X.
To view, change and save settings, you must provide
mains power to [POWER/LINE IN].
When changes have been made –turn the
SETTINGS switch OFF and the system will
automatically restart.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 9
Settings Menu
The GDP2X has a touch screen which allows the engineer/ user to configure the system.
Adjust the screen brightness. Change/Select option
Press or slide the cursor up and down. Press the blue option box or press and hold.
When changes have been made –turn the SETTINGS switch OFF and the system will restart.
Settings Options Explained
FUNCTION
OPTIONS
Explanation
BMS relay ON/OFF for-
- Gas
- Error
Gas changes relay state with gas valve status only.
Error changes relay state upon all alarm messages.
Auto Start-
- ON
- OFF
In the event of a power loss - the GDP2X will restart
automatically when power is restored, or not.
Factory Set Condition
BMS relay ON/OFF for-
- Gas
Auto Start-
- OFF
Trouble Shooting
Fault.
Possible Cause/Correction.
Detector not responding.
oIncorrect wiring.
oID switches not properly configured.
oTermination switches not set up correctly.
Service message
oDetector requires service –contact supplier.
End of Life message
oDetector requires replacement –contact supplier.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 10
Specification
Product:
Gas Detection Panel
Model:
GDP2X
Display
2.8” Touch Screen TFT
Power Input Voltage
100-120V AC
Gas Valve Output Voltage
100-120V AC
BMS Output:
3A
Current Consumption
20W max (full load)
Internal Fuse
3.15A
Operating Temperature
32 –122°F 30-85%RH Non-Condensing
Audible Alarm Buzzer dB
65 dB (300mm distance in quiet conditions)
Housing Material
Polylac PA-765
Flame Rating
UL 94
Approvals
CE, RoHS
O/All Dimensions (H x W x D) mm / inch
5.51 x 7.48 x 2.44”

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 11
OPERATION
First Power Up
On connecting mains power, the GDP2X panel will ‘warm up’ for
approximately 60 seconds –during this time the screen will display an
‘initialisation’ message.
The panel will search for detectors wired to the system.
Main Screen
When the GDP2X has completed initialising –the Main screen will
appear.
The Main screen gives an overview of the status of each zone
being monitored by gas detectors (detectors sold separately)
and if the gas supply is on or off.
ZONE STATUS EXPLANATION
OK
oGas levels are safe.
oNo error conditions.
ALERT
oDetector(s) are in Pre-Alarm status.
oDetector(s) require service.
oDetector gas sensor(s) end of life.
ALARM
oDangerous gas levels detected. (Gas is shut off).
oDetector gas sensor fault or detector(s) disconnected. (Gas is shut off).
DISABLED
oNo detector signals are received from the zone.
Zone Screens
Switch between zone screens by touching the relevant zone screen, i.e. Z1 or Z2.
Each zone can display up to 4 detectors as follows:
a. The detector identification number (configured via dip
switches on the detector circuit board).
b. The unique serial number for that detector.
c. The target gas that the detector is monitoring.
d. The status of gas levels, errors and messages.
e. The concentration value of gas being monitored.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 12
Alarm Messages
The GDP2X will display messages when in alarm –the messages are prompted from external
devices that have been connected i.e. heat sensor or remote emergency stop.
When the GDP2X goes in to alarm, the user can silence the audible buzzer by pressing MUTE.
During the alarm, the gas will be shut off and no gas detection details will be available.
After the cause of alarm has been rectified –press the RESET button on the GDP2X panel.
Alarm Message List
EMERGENCY SHUT OFF
An emergency shut-off button has been activated.
Pressing MUTE on the GDP2X will silence the audible alarm buzzer.
Investigate and rectify the issue before RESETTING the panel.
FIRE PANEL ALARM
The fire alarm panel has reached alarm status.
Pressing MUTE on the GDP2X will silence the audible alarm buzzer.
Investigate and rectify the issue before RESETTING the panel.
HEAT SENSOR ALARM
Heat sensor/ thermal link has reached alarm status.
Pressing MUTE on the GDP2X will silence the audible alarm buzzer.
Investigate and rectify the issue before RESETTING the panel.
DETECTOR ALARM
If dangerous gas levels are detected, your GDP2X will
show the detector ID in alarm in the top left hand
corner.
Pressing MUTE on the GDP2X will silence the audible alarm buzzer.
Investigate and rectify the issue before RESETTING the panel.
The cause of alarm will have to be investigated and rectified before resetting the GDP2X.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 13
Servicing & General Maintenance
On the gas detector - a service message will intermittently flash every 30 seconds after one year
of operation. The detector will still operate as intended but contact your supplier immediately.
When Merlin gas detector(s) display the service message –the GDP2X panel will show [SERVICE]
on the status screen.
The GDP2X will still operate as intended and if any dangerous gas levels are detected, your
GDP2X will show the detector ID in alarm in the top left hand corner.
DO carefully remove any accumulated dust from the outer enclosure once a month.
NEVER use detergents or solvents to clean your detectors –this may permenantly or
temporarily damage the gas sensing elements.
NEVER spray lighter gas, paint or other aerosols near the detectors.
NEVER paint the device. Paint will seal vents and may interfere with the device.
It is recommended that detectors are inspected and serviced at least annually from the
date of installation for optimum performance and protection.
Avoid exposure of high concentrations of alcohol found in many products, this can damage,
deteriorate or affect the gas detectors. For more information refer to your detector manual.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 14
Bump Testing
What is Bump Testing?
Bump testing is a term used for checking a gas detector is functioning correctly by exposing it to
the target gas. A known concentration of the target gas is applied to the device to trigger an
alarm condition and ascertain the detector is working safely.
Why is it Important?
A detector may visually appear in good order, but its sensitivity can be inhibited by external
factors such as, dust; humidity; temperature fluctuations; cleaning products; contaminants or
sensor drift (ageing). All can cause a decline in sensitivity and eventual failure.
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. The reading (if displayed) is
compared to the actual content of gas present, as stated on the test gas cylinder and if the
detector goes into alarm within an acceptable range of the actual concentration, usually within
10%, then it is working safely.
If the bump test results are not within the acceptable range, the gas detector must not be used
until a full calibration has been conducted.
Bump testing has a number of benefits for the end user:
Peace of mind that the system does actually detect the gas in question.
Allows the site to practice safe operations in a similar manner to the fire system.
Early indication of any issues.
How Often?
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.
Current standards recommend that for new installations - it may be prudent to carry out a bump
test frequently (perhaps weekly), following a successful initial period and as confidence grows in
the installation concerned, the frequency could be reduced.
Remember, bump testing does not remove the need to have gas detectors inspected,
calibrated and serviced periodically by a trained engineer. You should not attempt this yourself
and should employ the services of a specialist company.
For more information on this, contact us.

Installation & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 15
IMPORTANT WARNING STATEMENTS
Please take the time to thoroughly read this user’s guide which should be retained for future reference.
It is recommended that this device be commissioned upon installation and serviced at least annually.
Do not apply lighter gas or other aerosols to detectors –this will cause extreme damage to the gas sensing elements.
High concentrations of alcohol found in many products may damage, deteriorate or affect the gas sensing elements of
the detectors –Avoid exposure near your devices.
This device is designed to detect the gas displayed on screen and in the designated zone area from any source of
combustion or dangerous level. It is NOT designed to detect smoke, fire or other gases and should NOT be used as such.
This device provides early warning of the presence of gas, usually before a healthy adult would experience symptoms.
This early warning is possible provided your alarm is located, installed and maintained as described in this guide.
Never ignore your device when in alarm. Actuation of your alarm indicates the presence of an error or significant issue
that requires immediate attention.
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.
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 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 exp enses 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 & Operation Manual Merlin GDP2X
AGSGDP2X - IOM Iss: 3 03-20 16
Installation Details
Please pass this manual to the system owner or system user.
Date of Installation:
Installation Location:
Organisation:
Stamp/ Signature of the installer:
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CONTACT US:
AGS Head Office
Tel: [phone]
Fax: [phone]
[e-mail]
American Gas Safety is the owner of this document and reserves all rights of modification without prior notice.