AGS Merlin GDP2 User manual

Merlin GDP2 User Guide
Rev: 05 05-19 1
Gas Safety Products
Merlin GDP2
Gas Detection Panel
User Guide
Please read this guide carefully and retain for future use.

Merlin GDP2 User Guide
Rev: 05 05-19 2
Table of contents
1General Information..........................................................................................3
1.1 Panel Mounting.............................................................................................................3
2Circuit Board Terminals .....................................................................................4
2.1 POWER ...........................................................................................................................4
2.2 GAS VALVE ....................................................................................................................4
2.3 GAS DETECTOR ZONE 1 & 2 .........................................................................................4
2.4 EM REMOTE (Remote emergency shut off buttons).................................................5
2.5 HEAT SENSOR .................................................................................................................5
2.6 FIRE PANEL .....................................................................................................................5
2.7 BMS OUT .........................................................................................................................5
2.8 SOUNDER/STROBE .........................................................................................................5
3Operation Instructions.......................................................................................6
3.1 System ON and OFF .....................................................................................................6
3.2 Mute Button...................................................................................................................6
3.3 Reset Button ..................................................................................................................6
3.4 Emergency Shut Off .....................................................................................................6
3.5 BMS Integration .............................................................................................................6
3.6 Auto Reset .....................................................................................................................6
3.7 Zones 1-2 Dip-Switches.................................................................................................7
4Panel LED status.................................................................................................7
5Maintenance .....................................................................................................8
6GDP2 Wiring Spec .............................................................................................8
7Manufacturer’s Warranty ................................................................................12

Merlin GDP2 User Guide
Rev: 05 05-19 3
1General Information
The Merlin GDP2 is a two-zone gas detection panel which can be used in many applications,
e.g. factories, car parks, shopping centres and the most common being a boiler house
application.
Many varieties of detectors are compatible with GDP2, e.g. Natural Gas, Carbon Monoxide,
LPG and Oxygen depletion. These detectors can be used in any combination. Also multiple
thermal links can be used, when wired in series. The GDP2 can be integrated with a BMS, fire
alarm and remote emergency shut-off buttons.
The information contained within this guide should be referenced for typical installation and
operation only. For site specific requirements that may deviate from the information in this
guide –contact your supplier.
1.1 Panel Mounting
The control panel is designed for surface mounting using 4 mounting screws. Removing the
cover on the panel gives access to the circuit board, this should be removed before drilling
entry holes into the case.
Important Warning Statements
It is recommended that this device be commissioned upon installation and serviced annually.
Do not apply lighter gas or other aerosols to gas detectors –this will cause extreme damage.
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.
Your product should reach you in perfect condition, if you suspect it is damaged, contact your supplier.
Information on waste disposal for consumers of electrical & electronic equipment. (EEE)
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.

Merlin GDP2 User Guide
Rev: 05 05-19 4
2Circuit Board Terminals
2.1 POWER
A 110-120VAC electrical supply should be externally fused at 3
Amps and connected to the terminals marked [POWER L N E].
2.2 GAS VALVE
The gas solenoid valve should be powered using the terminals
on the Merlin GDP2 marked [GAS VALVE LNE].
2.3 GAS DETECTOR ZONE 1 & 2
These connections are [+,-] and [CL] and can be wired to a Merlin
gas detector. Natural gas, Carbon monoxide or LPG.
See below diagram for multiple zone wiring. For more information,
refer to your detector manual.

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Rev: 05 05-19 5
2.4 EM REMOTE (Remote emergency shut off buttons)
The terminal for remote emergency shut-off buttons is detailed on the
circuit board as [EM REMOTE].
These connections are linked out as a factory setting. Remote
emergency shut-off buttons should be volt free and wired to the Merlin
GDP2 using two-core cable.
2.5 HEAT SENSOR
The terminal for heat detectors is detailed as [HEAT SENSOR].
These connections are linked out as a factory setting.
Heat detectors should be volt free and wired to the Merlin GDP2 using two-
core cable.
2.6 FIRE PANEL
The terminal for fire alarms is detailed as [FIRE PANEL].
These connections are linked out as a factory setting.
Fire alarms should be volt free and wired to the Merlin GDP2 using two-
core cable.
2.7 BMS OUT
Terminal connections are available on the circuit board for connections
to Building Management Systems etc.
Marked on the circuit board as [BMS OUT - N/O - COM - N/C] these are
volt free connections.
2.8 SOUNDER/STROBE
The terminal for audible/visual alarms is detailed on the circuit board as
[SOUNDER/STROBE].
Sounder alarms should be wired using low voltage cable and wired to the
Merlin GDP2 using two-core cable.
This terminal has a 24VDC output.

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Rev: 05 05-19 6
3Operation Instructions
3.1 System ON and OFF
To turn the system on press reset to start the testing sequence.
The system will close the solenoid valve when an emergency stop has been pressed, gas has
been detected or any alarm signal has been triggered.
3.2 Mute Button
The mute button is located on the front fascia of the GDP2 and is used to mute the sounder
inside the board when in alarm.
The internal buzzer operates at approximately 90db measured 30cm from a closed panel.
The mute button is used to mute the sounder inside the board when in alarm.
3.3 Reset Button
The reset button is located on the front fascia of the GDP2 and is used to turn the system on
and to reset the system following alarm.
3.4 Emergency Shut Off
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 when activated.
To reinstate the system, the emergency shut off button(s) will need to be reset and the panel
restarted.
3.5 BMS Integration
The Merlin GDP2 can be integrated with a BMS to make or break a circuit
on gas on/gas off, (valve open or valve closed). This will tell the BMS
whether or not electrical power is being sent to the solenoid.
There is a dip-switch located on the inside facia of the Merlin GDP2
labelled [BMS]. This is factory set in the ‘off’ position which signals the BMS
on gas on/gas off.
When switched to the ‘on’ position, the GDP2 will only signal the BMS on a
fault, i.e. gas detected, EM Stop pressed, etc.
3.6 Auto Reset
The Merlin GDP2 has a built-in auto reset feature. There is a dip-switch
located on the PCB of the Merlin GDP2 labelled [Auto]. This is factory set in
the ‘off’ position. When the power is restored after the power cut, the panel
has to be restarted manually.
On installation, this can be switched to the ‘on’ position if required. This will
instruct the system to restart automatically when power is restored following
a power cut.

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Rev: 05 05-19 7
3.7 Zones 1-2 Dip-Switches
There is a set dip-switches located on the PCB of the Merlin GDP2 labelled
[ZONE 1] & [ZONE 2].
This is factory set in the ‘off’ position.
For each of the gas detector zones you are using please ensure that the
relevant zone has being enabled. The zones you are not using should be left
disabled.
4Panel LED status
When the system is connected to the mains supply, the Power LED will illuminate.
When no power is present, this LED will not light up.
Gas on
On start up the Gas on LED will flash for one minute to check for gas being detected. If there is
no gas detected or any other faults the gas valve will open and the green ‘Gas On’ LED will
illuminate. If the test is unsuccessful the relevant zone LED light will illuminate to indicate a fault.
GREEN = Gas On
OFF = Gas Off
EM Stop
If an emergency shut off button (either remote or on the panel) is pressed, the LED will
illuminate AMBER and the gas will be turned off.
The EM Stop button must be re-set before restarting the system.
OFF = OK
AMBER = EM Stop button pressed
Heat Detector
Under normal working conditions this LED is off. If the fusible link melts at 72 Degrees Celsius or
higher, the LED will show AMBER and the Gas valve will turn off.
Fire Alarm Panel
If the fire alarm panel has been activated, the LED will illuminate Amber and the gas will be
turned off. The Fire alarm panel must be re-set before restarting the system.
Off = OK
AMBER = Fire alarm activated.
Zones 1-2
GREEN - Under normal working conditions.
AMBER - If the external detector connected detects the low level alarm.
RED - If the detector connected detects high level alarm. The gas valve will close.

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Rev: 05 05-19 8
5Maintenance
To keep your panel in good working order, you must follow these steps:
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 panel
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.
6GDP2 Wiring Spec
1. POWER: Mains Input 110-120VAC.
2. GAS VALVE: Gas Solenoid Valve Power Output, 110-120VAC.
3. GAS DETECTOR ZONE 1: 24VDC power supply (purchased separately).
4. GAS DETECTOR ZONE 2: 24VDC power supply (purchased separately).
5. EM REMOTE: Remote emergency stop buttons (purchased separately). VOLT FREE INPUT
6. HEAT SENSOR: Fusible Links (purchased separately). VOLT FREE INPUT
7. FIRE PANEL (Supplied by others). VOLT FREE INPUT
8. BMS OUT: output contacts. Normally Open, Common and Normally Closed..
9. SOUNDER/STROBE: Alarm, 24VDC power supply (purchased separately).
10. AUTO RESET & BMS SELECTION SWITCH
11. ZONE ENABLE/DISABLE SWITCH

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Merlin GDP2 User Guide
Rev: 05 05-19 12
7Manufacturer’s Warranty
3 Year Limited 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.
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.