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Installation & Operation Manual

Switch Settings

There are various DIP-switches on the front circuit board that can be adjusted to configure your

system as per the following.

Building Management System Integration

There is a DIP-switch located on the circuit board labelled [BMS SEL].

The panel can be integrated with a BMS to make or break a circuit when the gas is either on or

off, (valve open or valve closed). This will tell the BMS whether or not power is being sent to the

solenoid valve.

OFF

Signals the BMS when gas is on or gas is off. (Default)

Signals the BMS on a fault, i.e. high gas levels detected, emergency

shut-off activated, etc.

Fan Switch Integration

There is the facility to connect a Fan Switch.

A fan switch (Merlin FS1 or FS2 - sold separately) provides the facility to turn on fan(s) when the

1500S panel is switched on and removes power to fan(s) when the switched off.

There is a switch located on the circuit board labelled [EM SEL].

Instructs the system to shut down fan(s) and gas supply upon

OFF

activation of emergency shut off button(s). (Default)

Instructs the system to leave the fans on and shut off the gas supply

only upon activation of emergency shut off button(s).

This option is not available if a Fan Switch is not installed.

Fire Panel 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.

If there are no remote emergency shut off buttons being installed, wire this directly to the

terminal marked [EM REMOTE].

1500S IOM Rev: 08

01-20

Merlin 1500S