Merlin
Product Data Sheet
S&S Northern Ltd
6
CO2/Gas Detected LED
Under normal working conditions this LED is off. If the external Merlin detector/ CO2
connected detects gas this will show RED and the Gas valve will turn off.
OFF = OK
RED = Gas detected / high ppm levels of CO2
Fan Fault LED
Under normal working conditions this LED is off. If a fan fault is present for more than 10
seconds, the LED will illuminate RED. The system will only go into fan fault from gas on.
OFF = OK
RED = the gas supply has been shut off due to a ventilation fault.
WHEN A FAULT IS PRESENT YOU WILL NEED TO CONTACT YOUR
SERVICE/MAINTENANCE COMPANY.
YOU SHOULD NOT ATTEMPT TO CARRY OUT A REPAIR OR RECTIFY THE FAULTS
UNLESS YOU ARE QUALIFIED TO DO SO.
3.3
Using the emergency shut off
The Emergency shut off button is located on the front of the panel. There is also a facility for
remote shut off buttons to be wired in series.
The Emergency shut off button(s) will cut off the gas supply when activated.
To reinstate the system, the Emergency shut off button(s) will need to be reset and the panel
restarted.
3.4
BMS integration
The Merlin 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 the room has use of the
gas supply.
There is a dip-switch located on the inside facia of the Merlin
labelled ‘BMS
Selection’. This is factory set in the ‘off’ position which signals the BMS on gas on/gas off.
When swit
ched to the ‘on’ position, the will only signal the BMS on a fault, i.e. CO2
high level detected, gas detected, EM Stop pressed, etc.
3.5
Fire alarm integration
The Merlin can be integrated with a fire alarm to close the gas supply
automatically in the event of a fire.
The volt free fire alarm signal can be wired in series with any remote emergency shut
off buttons. If there is no remote emergency stop buttons installed wire this directly to
the terminal marked ‘EM REMOTE’
3.6
Fan switch integration
There is the facility to connect a Fan Switch (FS1 or FS2 sold separately).
The Fan Switch provides the facility to turn on the fan(s) when the key switch on the
Merlin is in the on position and turn the power off to the fan(s) when the
key switch on the Merlin is in the off position. There is a dip-switch located
inside the facia of the Merlin labelled EM Selection.
