Board Connections Overview - S&S Northern Merlin 2000X Installation & Operation Manual

Installation & Operation Manual

Board Connections Overview

1. POWER / LINE IN.
100-240Vac electrical power should be supplied to the [POWER / LINE IN] terminal and fused at 3A.
On connecting the mains supply to the panel the power LED indicator will light up – this is located
on the front cover (red dot of logo).
2. GAS VALVE OUT.
100-240Vac electrical power output is supplied from the [GAS VALVE OUT] terminal using a 3 core
cable can be connected to a gas solenoid valve and isolate gas supply on alarm status. Pressure
sensors should be screwed to the downstream port of the solenoid valve.
Refer to your valve manual for more information.
3. BMS OUTPUT.
Connections are available on the board for Building Management Systems. This is a relay that
changes state in alarm or when the gas is on/off. It can be used in conjunction with the 24Vdc
output and other external relays that affect other devices and controls such as purge fans and
audible alarms etc.
See section: SETTINGS- for BMS options.
4. EM REMOTE.
Open/Close circuit connections for external devices is marked as [EM STOP] and can shut off utility
supply when activated.
This is fitted with a factory link to represent a closed circuit.
5. FIRE PANEL
The terminal for fire alarms is detailed on the circuit board as [FIRE PANEL] and can shut off utility
supply when activated.
This is fitted with a factory link to represent a closed circuit.
6. EXTERNAL FAN CURRENT SENSORS
These terminals are used to receive an input signal from external air pressure switches or external
current monitors. These are linked out as a factory setting to represent a closed circuit.
If only one fan is being used, the terminal not in use should be left closed!
Rev: 1
Merlin 2000X
6