S&S Northern Merlin 1000VW+ User manual

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 1
Gas Safety Products
Merlin 1000VW+ Gas Proving, Electric & Water Isolation System
Installation, operating and maintenance
20/01/2017

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 2
Table of contents
1General information ..........................................................................................3
2Installation .........................................................................................................3
2.1 Panel Mounting...............................................................................................................3
2.2 Mains Supply...................................................................................................................3
2.3 Gas solenoid valve..........................................................................................................3
2.4 Electric Contactor............................................................................................................3
2.5 Water Valve.....................................................................................................................3
2.6 BMS Connections. ..........................................................................................................3
2.7 Gas Pressure Transducer...............................................................................................3
2.8 Timeout Facility...............................................................................................................3
2.9 Remote Emergency Shut Off Buttons.............................................................................4
2.10 CO2/Gas Detected..........................................................................................................4
2.11 FS 123.............................................................................................................................4
2.12 Fan PD Switch. ...............................................................................................................4
2.13 12v DC............................................................................................................................4
2.14 Internal Buzzer................................................................................................................4
3Operation Instructions......................................................................................4
3.1 How to turn the system on and off..................................................................................4
3.2 Explanation of LED status...............................................................................................4
Power LED......................................................................................................................4
Gas on LED.....................................................................................................................5
Electric on LED ...............................................................................................................5
Water on LED..................................................................................................................5
Testing LED ....................................................................................................................5
Test Fail LED ..................................................................................................................5
Pressure Low LED..........................................................................................................5
Timeout LED...................................................................................................................5
EM Stop LED ..................................................................................................................5
CO2/Gas Detected LED ..................................................................................................6
Fan Fault LED..................................................................................................................6
3.3 Using the emergency shut off.........................................................................................6
3.4 BMS integration ..............................................................................................................6
3.5 Fire alarm integration......................................................................................................6
3.6Fan switch integration.....................................................................................................6
3.7 Gas fill and prove time....................................................................................................7
3.8 Auto reset........................................................................................................................7
1000VW+ Wiring Diagram.........................................................................................8

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 3
1 General information
The Merlin 1000VW+ 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 1000VW+
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 1000VW+ 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
1000VW+ 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. Detailed 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 1000VW+ 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 1000VW+
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)

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 4
On Auto-shut down gas supply will be turned Off. There are two blue dip-switches
located on the inside facia of the Merlin 1000VW+ labelled “Electric” and “Water”.
They are factory set in the ‘off’ position. On installation, they can be switched to the
‘on’ position. This will instruct the system to also turn off Electric and/or Water
services when performing Auto-shut down.
2.9 Remote Emergency Shut Off Buttons. The terminal for remote emergency shut-off buttons
is detailed on the circuit board as “EM Remote”. These connections are linked out as a factory
setting. Remote emergency shut-off buttons should be volt free and wired to the Merlin
1000VW+ using two-core cable.
2.10 CO2/Gas Detected. The terminals detailed on the circuit board as “Gas Detector”. These
connections are “+,-“ and ” ” these can be wired to a Merlin Natural gas, Carbon monoxide
or LPG detector. This terminal can also be wired to a CO2 monitor to shut off the system in the
event of High CO2 levels. If no detector is being used leave the link in between the “ ”.
2.11 FS 123. This terminal switches 12v when the key is turned on and off. This can be linked to a
fan switch (panel supplied separately) which can provide power to the fans when the control
panel is switched on.
2.12 Fan PD Switch. This terminal is used to receive an input signal from external air pressure
switches or external current monitors. This terminal is linked out as factory setting. Wiring to
the air pd switches & current monitors should be made using a two-core cable and volt free
connections.
2.13 12v DC. This is a permanent 12v DC output when there is power at the panel.
2.14 Internal Buzzer. Operates at 65dB measured 30cm from closed panel.
Note: all low voltage connections should be made using a screened cable to
avoid electrical interference should not be in the same conduit as per the low
voltage directive.
3 Operation Instructions
3.1 How to turn the system on and off
1. Turn the key switch to on position.
2. Gas, electric and water will flash for 10 seconds.
3. Press relevant service button to turn required utility on.
4. Turn the key switch to the off position to turn the panel off.
Please Note: All services can be turned on or off only within 10 secs of the key
switch being turned on. After 10 secs, all utility buttons will be disabled. The
user must turn the key off and back on to adjust any services.
3.2 Explanation of LED status
Power LED
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 light up.
RED = OK
OFF = No power to 1000VW+

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 5
Gas on LED
When the gas service touch button has been activated the Merlin 1000VW+ will check the
installation for gas leaks. If gas proving is successful, the gas valve will open and the green
‘Gas On’ LED will illuminate.
GREEN = Gas On
OFF = Gas Off
Electric on LED
When the electric service touch button has been activated, the electrical supply is turned on
and the Electric LED will illuminate BLUE.
BLUE = Electric On
FLASHING = Electric Off, Electric button enabled
OFF = Electric Off, Electric button disabled
Water on LED
When water service touch button has been activated, the water supply is turned on and the
Water LED will illuminate BLUE.
BLUE = Water On
FLASHING = Water Off, Water button enabled
OFF = Water Off, Water button disabled
Testing LED
This LED will illuminate GREEN for approximately 30 seconds when the panel is
checking the integrity of the gas installation upon start up.
GREEN = proving the gas line, do NOT operate any appliances.
Test Fail LED
Under normal working conditions this LED is off. When the panel detects a gas leak on start-
up or incorrect wiring at the gas pressure transmitter the LED will illuminate AMBER and the
gas valve will remain closed.
OFF = OK
AMBER = gas proving failed
Pressure Low LED
Under normal working conditions the LED is off. The LED will illuminate AMBER when
pressure of the gas supply drops below 12mBar for 10 secs. The gas valve will close. (The
system will only go to pressure low from gas on).
OFF = OK
AMBER = gas supply pressure low.
Timeout LED
Under normal working conditions this LED is off. This LED will illuminate AMBER when
auto-shut down has occurred.
OFF = OK
AMBER = auto-shut down
EM Stop LED
If an emergency shut off button (either remote or on the panel) is pressed, the LED will
illuminate AMBER and the gas will be turned off. The EM Stop button must be re-set before
restarting the system.
OFF = OK
AMBER = EM Stop button pressed

Merlin 1000VW+ 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 1000VW+ 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 1000VW+ labelled ‘BMS
Selection’. This is factory set in the ‘off’ position which signals the BMS on gas on/gas off.
When switched to the ‘on’ position, the 1000VW+ 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 1000VW+ 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 1000VW+ is in the on position and turn the power off to the fan(s) when the
key switch on the Merlin 1000VW+ is in the off position. There is a dip-switch located
inside the facia of the Merlin 1000VW+ labelled EM Selection.

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 7
This is factory set in the ‘off’ position which instructs the system to shut down the
fan(s) and gas supply on activation of the Emergency shut off button(s). On
installation, this can be switched to the ‘on’ position if required. This will instruct the
system to leave the fans on and only shut off the gas supply on activation of the
Emergency shut off button(s). Note: This option is not available if Fan Switch is not
installed.
3.7 Gas fill and prove time
Gas fill and prove times are adjustable. There are two dip-switches located on the
inside facia of the Merlin 1000VW+ labelled “Fill Time” and “Prove Time”. They are
factory set in the ‘off’ position. Fill and prove time can be changed by turning the relevant dip
switch to on position.
Fill time: Off –5 secs, On –10 secs
Prove time: Off –30 secs, On –50 secs
Once the settings has been changed, please remove power from the fuse spur for 10
seconds.
3.8 Auto reset
The Merlin 1000VW+ has a built-in auto reset feature. There is a dip-switch located on the
inside facia of the Merlin 1000VW+ labelled “Auto Reset”. This is factory set in the ‘off’
position. When the power is restored after the power cut, the panel has to be restarted
manually. On installation, this can be switched to the ‘on’ position if required. This will instruct
the system to restart automatically when power is restored after the power cut.

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 8
1000VW+ Wiring Diagram
1. Mains Input 230V Single Phase.
2. Gas Solenoid Valve Power Output, 230VAC, Max 3A.
3. Electric Contactor Power Output, 230VAC, Max 3A.
4. Water Valve Power Output, 230VAC, Max 3A.
5. Supply Fan PD Switches terminal, this is disabled on this system.
6. Extract Fan PD Switches terminal, this is disabled on this system.
7. BMS output contacts. Normally Closed, Common and Normally Open. Max.1A @ 230VAC.
8. Gas pressure transducer, Red + positive, Black –negative and Blue IN.
9. Remote EM Stop buttons and Fire Alarm input wired in series (purchased separately). VOLT
FREE INPUT
10. Methane, CO or LPG Detector, power supply and volt free input (purchased separately).
CO2 Monitor (purchased separately). VOLT FREE INPUT
11. Fan Switch output (purchased separately). For wiring instruction, see Fan Switch user manual.
12. Fan PD Switches terminal (purchased separately). VOLT FREE INPUT
13. Permanent 12VDC output when there is power at the panel.
Please note, Mains wires and low voltage wires should
not be run in the same conduit as per the LOW
VOLTAGE DIRECTIVE
1
2
5
3
6
7
8
9
10
11
L
N
E
Gas Valve
Pressure
Transducer
EM
Stop
Gas Detector/
CO2 Monitor
3
L
N
E
Water Valve
4
5 6 7 8 9 10 11 12 13
PD Switches or Current Switches
(Volt Free)
F
A
N
P
D
S
W
I
T
C
H

Merlin 1000VW+ Product Data Sheet
S&S Northern Ltd 9
CONTACT US:
S&S Northern Head Office
Tel: [phone]
Fax: [phone]
www.snsnorthern.com
[e-mail]
South East Division
Tel: [phone]
Fax: [phone]
[e-mail]
Rev
Date
Author
Description
01
20/01/2017
S&S Northern
BT
Merlin 1000VW+ Product Data Sheet –First issue
S&S Northern is the owner of this document and reserves all rights of modification without prior notice.