Installation & Operation Manual Merlin GDP2
Rev: 09 01-20
6
REMOTE EMERGENCY STOP 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.
HEAT SENSOR
The terminal for heat detectors is detailed on the circuit board 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.
FIRE PANEL
The terminal for fire alarms is detailed on the circuit board 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.
SOUNDER / STROBES
There are connections for an external sounder alarm/ strobe lighting to activate on alarm.
Refer to your sounder/ strobe manual for wiring.
BMS Wiring and Set-Up Switch
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 other external relays that affect other devices and controls such as purge fans
and audible alarms etc.
The 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 GDP2 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 GDP2 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.
