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.
