S&S Northern Merlin 1000S User manual

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 1
Gas Safety Products
Merlin 1000S Gas Proving System
Installation, operating and maintenance
23/08/2016

Merlin 1000S Gas Proving System 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 BMS Connections. ..........................................................................................................3
2.5 Gas Pressure Transducer...............................................................................................3
2.6 Timeout Facility...............................................................................................................3
2.7 Remote emergency shut off buttons...............................................................................3
2.8 Gas Detector...................................................................................................................3
2.9 FS 123.............................................................................................................................4
2.10 CO2 Monitor....................................................................................................................4
2.11 12v DC............................................................................................................................4
2.12 Internal Buzzer................................................................................................................4
3Operation Instructions......................................................................................4
3.1 How to turn the system on and off..................................................................................4
3.2 Explanation of LED status...............................................................................................4
3.2.1 Power LED......................................................................................................................4
3.2.2 Gas on LED.....................................................................................................................4
3.2.3 Testing LED ....................................................................................................................4
3.2.4 Test Fail LED ..................................................................................................................4
3.2.5 Pressure Low LED..........................................................................................................4
3.2.6 Timeout LED...................................................................................................................5
3.2.7 EM Stop LED ..................................................................................................................5
3.2.8 Gas Detected LED..........................................................................................................5
3.2.9 CO2 High ........................................................................................................................5
3.3 Using the emergency shut off.........................................................................................5
3.4 BMS integration ..............................................................................................................5
3.5 Fire alarm integration......................................................................................................5
3.6 Fan switch integration.....................................................................................................6
3.7 Gas fill and prove time ....................................................................................................6
3.8 Auto reset........................................................................................................................6
4. 1000S Wiring Diagram.................................................................................7

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 3
1 General information
The Merlin 1000S is a gas pressure proving & gas detection panel
The system comprises of a control panel and a gas pressure sensor. The Merlin 1000S can
receive connections from 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 1000S marked “LNE to VALVE”.
2.4 BMS Connections. Terminal connections are available on the circuit board for connections to
Building Management systems etc. Detailed on the circuit board as “BMS OUT N/C, COM and
N/O” these are volt free connections.
2.5 Gas Pressure Transducer. The terminals marked pressure sensor “+ - IN “.These wire to the
gas pressure transducer which is screwed into the downstream port on the gas solenoid valve.
Red + positive, Black –negative and Yellow or Blue IN. Please ensure this is wired as
instructed.
Minimum Operating Pressure = 12Mbar
Maximum Operating Pressure = 100Mbar.
2.6 Timeout Facility. The Merlin 1000S 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 dip-switches
located on the inside facia of the Merlin 1000S labelled “Time1” and “Time2”. They are factory
set in the ‘off’ position for a 2 hour timeout. 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)
On Auto-shut down gas supply will be turned off.
2.7 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 1000S
using two-core cable.
2.8 Gas Detector. 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. If no detector is being used leave the link in between the “ ”. Other detector
types are available.

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 4
2.9 FS 123. This terminal switches 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.
2.10 CO2 Monitor. This terminal can be wired to CO2 monitor to shut off the system in the event of
High CO2 levels. If no CO2 monitor is supplied leave the terminal link in.
2.11 12v DC. This is a permanent 12v DC output when there is power at the panel.
2.12 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 this should not be in the same conduit as mains cable as per the
low voltage directive.
3 Operation Instructions
3.1 How to turn the system on and off
1. Turn off all open appliances.
2. Turn the key switch to on position.
3. To turn the system off, turn the key switch to off position.
3.2 Explanation of LED status
3.2.1 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 1000S, a loose ribbon connection or the fuse may not be intact.
3.2.2 Gas on LED
When the key switch is turned on, the Merlin 1000S 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
3.2.3 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
3.2.4 Test Fail LED
Under normal working conditions this LED is off. When the panel detects a gas leak on start-
up, the LED will illuminate AMBER. Gas valve will remain closed.
OFF = OK
AMBER = gas proving failed
3.2.5 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.
OFF = OK
AMBER = gas supply pressure low.

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 5
3.2.6 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
3.2.7 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
3.2.8 Gas Detected LED
Under normal working conditions this LED is off. If the external Merlin detector connected
detects gas this will show RED and the Gas valve will turn off.
OFF = OK
RED = Gas detected.
3.2.9 CO2 High
Under normal working conditions this LED is off. If the concentration of CO2 in the air is at
alarm level (relevant detector required), the LED will show RED and the Gas valve will turn
off.
OFF = OK
RED = the concentration of CO2 is at alarm level.
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 1000S 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 230V is being sent to the
solenoid.
There is a dip-switch located on the inside facia of the Merlin 1000S 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 1000S 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 1000S 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’.

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 6
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 1000S is in the on position and turn the power off to the fan(s) when the key
switch on the Merlin 1000S is in the off position.
There is a dip-switch located inside the facia of the Merlin 1000S labelled EM
Selection.
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 1000S 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 1000S has a built-in auto reset feature. There is a dip-switch located on the
inside facia of the Merlin 1000S 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 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 7
1000S Wiring Diagram
1. Mains Input 230V Single Phase.
2. Gas Solenoid Valve Power Output, 230VAC, Max 3A.
3. Electric Contactor, this is disabled on this system.
4. Water Valve, this is disabled on this system.
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).
11. Fan Switch output (purchased separately). For wiring instruction see Fan Switch user manual.
12. CO2 Monitor (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
L
N
E
Gas Valve
Pressure
Transducer
EM
Stop
CO2
Monitor
Gas
Detector
3
4
5 6 7 8 9 10 11 12 13

Merlin 1000S Gas Proving System Product Data Sheet
S&S Northern Ltd 8
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
04
23/08/2016
S&S Northern
BT
Merlin 1000S Product Data Sheet –Fourth issue
S&S Northern is the owner of this document and reserves all rights of modification without prior notice.