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Installation & Operation Manual                                                                                               Merlin GDP4 

 

 

Rev: 11   03-21

 

6  

   

Wiring your Detector 

 

 

Power is supplied to a detector via the GDP terminal [+ / -] and using the panel [GAS DETECTION ZONE] terminal.  
If you are using a GDP panel you will need to use the detector [C/L] terminal as an alarm relay. 

 

   BMS Switch

 

 

The GDP4 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 GDP4 circuit board labelled [BMS]. This is factory set to ‘OFF’ position which signals the BMS on gas on/gas off.  
When switched to ‘ON’, the GDP4 will only signal the BMS on a fault, i.e. gas detected, EM Stop pressed, etc.  
 

BMS SWITCH 

BMS SIGNAL 

OFF 

Gas on or off only. 

ON 

Error condition i.e. gas detected, emergency stop pressed. 

 

   Auto Reset Switch

 

 
The panel has a built-in auto reset feature. There is a dipswitch located on the circuit board labelled [AUTO RESET].  
This is factory set in the ‘Off’ position i.e. when power is restored after a power cut or loss, the panel has to be 
restarted manually. When enabled, the system will restart automatically when power is restored and can be reset 
following a fire alarm and when the alarm is cleared. 
 

AUTO SWITCH 

CONDITION 

OFF 

Panel has to be restarted manually following a power cut/loss and/or alarm. 

ON 

Panel will automatically restart when power is restored and can be reset remotely via a fire panel. 

 

   Zone 1 - 4 Set-Up Switches

 

 
There are dip-switches located on the GDP4 circuit board labelled [ZONE 1] to [ZONE 4]. 
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.  

 

ZONE 1/2/3/4 SWITCH 

CONDITION 

OFF 

Gas detection zone disabled. 

ON 

Gas detection zone enabled. 

 

Summary of Contents for Merlin GDP4

Page 1: ...be used in many applications such as factories car parks shopping centres and boiler houses The GDP4 is used with up to twelve 12 gas detectors in a single cable run for monitoring and detecting gas i...

Page 2: ...ew 5 Board Connections Overview 5 Wiring your Detector 6 BMS Switch 6 Auto Reset Switch 6 Zone 1 4 Set Up Switches 6 Factory Set Condition 7 Trouble Shooting 7 Operation 7 Initial Power Up Commissioni...

Page 3: ...of defects in material and workmanship for a period of three 3 years from date of purchase or one 1 years for oxygen detectors The manufacturer s liability hereunder is limited to replacement of the p...

Page 4: ...s Methane NG High Level 300mm 1ft from ceiling Liquid Petroleum Gas LPG Low Level 300mm 1ft from ground level Carbon Monoxide CO Breathing Zone 1700mm 5ft 6 from ground level Hydrogen H High Level 300...

Page 5: ...supply to the panel the power LED indicator will light up this is located on the front GAS VALVE 100 240vac electrical power output from the VALVE OUT terminal using a 3 core cable to a gas solenoid...

Page 6: ...top pressed Auto Reset Switch The panel has a built in auto reset feature There is a dipswitch located on the circuit board labelled AUTO RESET This is factory set in the Off position i e when power i...

Page 7: ...light up Gas On On start up the Gas on LED will flash for one minute to check for gas detected If no gas detected or any other faults the gas valve will open and the Gas On LED will illuminate GREEN G...

Page 8: ...es tetraethyl lead halogens and halogenated compounds Manual Circuit Simulation Test When the test button on the circuit board is pressed and held for 3s the detector will simulate an open circuit to...

Page 9: ...Nitrogen 60s All certified test gases supplied by S S Northern are classified as non flammable and non toxic however they do contain gas under pressure and may explode if heated to extreme temperatur...

Page 10: ...Safe Areas not to be used in potentially explosive atmospheres Indicators LED Mounting Wall Mounting Electrical Max Power Consumption 20W Max Full Load Power Voltage Input Range 100 240vac Gas Valve...

Page 11: ...Installation Operation Manual Merlin GDP4 Rev 11 03 21 11 Page intentionally left blank...

Page 12: ...en damage caused by transit installation Every effort is made to ensure the accuracy of this document however S S Northern can assume no responsibility for any errors or omissions in this document or...

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