Merlin 1500S
User Guide
Rev: 07 05-19
7
3.5
Fire alarm integration
The Merlin 1500S 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.
4
Panel LED status
When the system is connected to the mains supply, the Red LED of the S&S Logo located in the
bottom right corner of the panel will illuminate. When no power is present, this LED will not
illuminate.
Gas On
When the fans are running at the correct speed and the key switch is turned on, the Merlin 1500S
will open the gas valve and the green ‘Gas On’ LED will illuminate.
ON = Gas On
OFF = Gas Off
Supply Fans
Under normal working the LED will illuminate GREEN. If a supply fan fault is detected, the LED will
be flashing. After 10 seconds of flashing, the gas supply will shut off.
ON = OK
FLASHING = One of the supply fans is not running.
Extract Fans
Under normal working the LED will illuminate GREEN. If an extract fan fault is detected, the LED
will be flashing. After 10 seconds of flashing, the gas supply will shut off.
ON = OK
FLASHING = One of the extract fans is not running
