Merlin GDP4
Product Data Sheet
Rev: 05 Date: 08-01-18
4
3
Operation Instructions
3.1
How to turn the system on and off
1. To turn the system on press reset to start the testing sequence.
2. 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
Explanation of LED status
3.2.1
Power LED
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.
RED = OK
OFF = No power to GDP4 or the fuse may not be intact.
3.2.2
Gas on LED
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 i.e.
“EM STOP”, 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
3.2.3
EM Stop LED
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
3.2.4
Heat Detector LED
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.
3.2.5
Fire Alarm Panel LED
If the fire alarm 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!
3.2.6
Zones 1-4 LED
Under normal working conditions this LED is GREEN. If the external Merlin detector connected detects
the low level alarm this will show AMBER. If the external Merlin detector connected detects the high
level alarm this will show RED and the gas solenoid valve will close.
Explanation of LED Status
OK (Green) LED
Green
– No gas detected.
Low (Amber) LED
Amber
– Low Level Alarm
High (Red) LED
Red
– Alarm!
