Merlin
Product Data Sheet
S&S Northern Ltd
3
1
General information
The Merlin is an Electric and Water utilities isolation panel with gas proving and
ventilation interlocking.
The system comprises of a control panel and a gas pressure sensor. The Merlin
can receive connections from remote air pressure differential switches or external current
monitors, remote emergency shut-off buttons, gas detectors and a CO2 monitor. It can also
be integrated with a BMS and fire alarm.
It is recommended that the user reads this guide before using the system. Please do NOT
attempt to operate the unit until the contents of this document have been read and are
thoroughly understood.
2
Installation
2.1
Panel Mounting.
The control panel is designed for surface mounting using 4 mounting screws.
Removing the cover on the panel gives access to the circuit board. The PCB should be
removed before drilling entry holes into the case.
2.2
Mains Supply.
A 230-volt electrical supply should be supplied to the panel. This should be
externally fused at 3 Amps using a fused spur and should be connected to the terminals
marked ”LNE Power IN”
2.3
Gas solenoid valve.
The gas solenoid valve should be powered using the terminals on the
Merlin
marked “LNE to VALVE” and will be internally fused at 3 Amps.
2.4
Electric Contactor.
An electrical output will be supplied to an electrical contactor (supplied by
others). This will be internally fused at 3 Amps and should be connected to the terminals
marked “LNE Electric Contactor”.
2.5
Water Valve.
The water solenoid valve should be powered using the terminals on the Merlin
1000V
W+ marked “LNE WATER VALVE” and will be internally fused at 3 Amps.
2.6
BMS Connections.
Terminal connections are available on the circuit board for connections to
Building Management systems etc. Detai
led on the circuit board as “BMS N/C, Com and N/O”
these are volt free connections.
2.7
Gas Pressure Transmitter.
The terminals marked pressure sensor “+ - in “.These wire to the
gas pressure transmitter which is screwed into the downstream port on the gas solenoid valve.
Red + positive, Black
– negative and Blue IN. Please ensure this is wired as instructed.
Minimum Operating Pressure = 12Mbar
Maximum Operating Pressure = 100Mbar.
2.8
Timeout Facility.
The Merlin has a built-in Auto-shut down feature and it will turn
itself off after predefined time. Auto-shut down timeout is selectable.
There are two blue dip-switches located on the inside facia of the Merlin
labelled “Time1” and “Time2”. They are factory set in the ‘off’ position. On installation, they can
be switched to the
‘on’ position to select required timeout.
Time1 Off, Time2 Off
– 2 hours
Time1 On, Time2 Off
– 4 hours
Time1 Off, Time2 On
– 8 hours
Time1 On, Time2 On
– no timeout (auto-shut down disabled)
