Installation & Operation Manual
Merlin 2000S
2000S
IOM
Rev: 01 01-22
5
4. BMS OUTPUT
Connections are available on the board for Building Management Systems.
[NO Normally Open] [COM Common] [NC Normally Closed]
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 the 12V DC output and other external relays that affect other devices and
controls such as purge fans and audible alarms etc.
See section; Switch Settings - for BMS options
6. EM REMOTE
Connections for remote emergency shut-off or stop buttons is detailed on the circuit board as
[EM REMOTE]. This is linked out as a factory setting.
7. GAS DETECTOR
Connections can be made for a Merlin gas detector (LPG, NG, CO or Hydrogen).
If no detector is being used leave the factory fitted link in.
A wiring example is shown.
Refer to your gas detector manual for further information.
8. FAN SWITCHES
This terminal switches when the key is turned on and off.
This can be connected to a fan switch (supplied separately) which can provide power to fans
when the control panel is switched on.
Screw the pressure sensor into the downstream port of your gas solenoid valve.
Pressure sensors should be screwed to the downstream port of the valve.
Pressure Sensors are tested and certified to AS 4628/2005.
The pressure sensor is wired to the [PRESSURE SENSOR] connector and screwed into the downstream
port of the gas solenoid valve.
Connect the pressure sensor as shown:
The sensor will monitor the gas supply pressure and if pressure drops below 0.5 or 1.2Kpa
–
the gas valve will close.
*
Maximum 100 Meters wiring distance from panel
See section; Switch Settings - for Pressure options
4. BMS OUTPUT
Connections are available on the board for Building Management Systems.
[NO Normally Open] [COM Common] [NC Normally Closed]
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 the 12V DC output and other external relays that affect other devices and
controls such as purge fans and audible alarms etc.
See section; Switch Settings - for BMS options
5
.
Pressure Sensor
