S&S Northern Merlin 500S User manual

Merlin 500S User Guide
Rev: 02 05-19 1
Gas Safety Products
Merlin 500S
Utility Isolation Controller
User Guide
Please read this guide carefully and retain for future use.

Merlin 500S User Guide
Rev: 02 05-19 2
Table of contents
1General Information..........................................................................................3
1.1 Panel Mounting.............................................................................................................3
2Circuit Board Terminals .....................................................................................4
2.1 POWER ...........................................................................................................................4
2.2 UTILITY 1 ..........................................................................................................................4
2.3 BMS OUT .........................................................................................................................4
2.4 EM REMOTE....................................................................................................................4
2.5 FIRE PANEL .....................................................................................................................4
3Installation & Operation ....................................................................................5
3.1 System On and Off .......................................................................................................5
3.2 Emergency Shut Off .....................................................................................................5
3.3 BMS Integration .............................................................................................................5
3.4 Fire Alarm Integration...................................................................................................5
3.5 Auto reset ......................................................................................................................5
4Panel LED status.................................................................................................6
5Maintenance .....................................................................................................6
6500S Wiring Spec ...............................................................................................7
7Manufacturer’s Warranty ..................................................................................8

Merlin 500S User Guide
Rev: 02 05-19 3
1General Information
The Merlin 500S is an isolation panel with UTILITY output.
The 500S is designed to provide an effective way of isolating gas, water, electricity, oil etc. by
means of a key switch on the panel or by the operation of the emergency shut off button.
The 500S can be integrated with a BMS, fire alarm and remote emergency shut-off buttons.
The information contained within this guide should be referenced for typical installation and
operation only. For site specific requirements that may deviate from the information in this
guide –contact your supplier.
1.1 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, this should be removed before drilling
entry holes into the case.
Important Warning Statements
It is recommended that this device be commissioned upon installation and serviced annually.
Do not apply lighter gas or other aerosols to gas detectors –this will cause extreme damage.
Never ignore your device when in alarm.
This device requires a continual supply of electrical power –it will not work without power.
This device should not be used to substitute proper installation, use and/or maintenance of fuel burning
appliances including appropriate ventilation and exhaust systems.
Your product should reach you in perfect condition, if you suspect it is damaged, contact your supplier.
Information on waste disposal for consumers of electrical & electronic equipment. (EEE)
When this product has reached the end of its life it must be treated as Waste Electrical & Electronics Equipment
(WEEE). Any WEEE marked products must not be mixed with general household waste, but kept separate for
the treatment, recovery and recycling of the materials used.
Please contact your supplier or local authority for details of recycling schemes in your area.

Merlin 500S User Guide
Rev: 02 05-19 4
2Circuit Board Terminals
2.1 POWER
A 100-240VAC line electrical supply should be externally fused at 3A and
connected to the terminals marked [POWER LNE].
2.2 UTILITY 1
The 100-240VAC output terminal detailed [UTILITY 1 LNE].
2.3 BMS OUT
Terminal connections are available on the circuit board for Building
Management systems etc.
Detailed on the circuit board as [BMS OUT - N/C, COM and N/O]
(Normally Closed / Common / Normally Open).
These are volt free connections.
This is a relay that changes state in alarm or when the utility is on/off.
2.4 EM REMOTE
This terminal is for remote emergency shut-off buttons and detailed on the
circuit board as [EM REMOTE].
This is linked out as a factory setting.
Remote emergency shut-off buttons should be volt free.
2.5 FIRE PANEL
The terminal for fire alarms is detailed on the circuit board as [FIRE PANEL].
This connections is linked out as a factory setting.
Fire alarms should be volt free and wired to the Merlin 500S using two-core
cable.

Merlin 500S User Guide
Rev: 02 05-19 5
3Installation & Operation
3.1 System On and Off
Turn the UTILITY key switch to ON, the “Utility” LED will illuminate green.
To turn the UTILITY off, turn the UTILITY key switch to the OFF position.
3.2 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 on the circuit board –see
[EM REMOTE].
The emergency shut off button(s) will cut off the utility supply when activated.
To reinstate the system, the emergency shut off button(s) will need to be reset and the panel
restarted.
3.3 BMS Integration
The Merlin 500S can be integrated with a BMS to make or break a circuit
on utility status on/ off.
This will tell the BMS whether or not power is being sent to the utility.
There is a dip-switch located on the circuit board labelled [BMS SEL]. This
is factory set to ‘OFF’ which signals the BMS on Utility status on/off.
When switched to ‘ON’, the 500S will only signal the BMS on a fault, i.e.
emergency stop pressed.
3.4 Fire Alarm Integration
The Merlin 500S can be integrated with a fire alarm to close the utility 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 stop buttons being installed, wire this directly to the
500S terminal marked [EM REMOTE].
3.5 Auto reset
The Merlin 500S has an auto reset feature.
There is a dip-switch located on the circuit board labelled [AUTO RESET].
This is factory set to ‘OFF’. When the power is restored after the power cut,
the panel has to be restarted manually.
Upon installation, this can be switched to ‘ON’ if required - this will instruct
the system to restart automatically when power is restored after the power
cut.

Merlin 500S User Guide
Rev: 02 05-19 6
4Panel LED status
Power
When the system is connected to the mains supply, the Power LED will illuminate.
When no power is present, this LED will not light up.
RED = OK
OFF = No power to 500S or the fuse may not be intact.
Utility
When the UTILITY key switch is in the OFF position or an emergency shut off button has been
pressed, the UTILITY LED will be OFF.
GREEN = Utility ON
OFF = Utility OFF
EM Stop/ Fire Alarm
If an emergency shut off button (either remote or on the panel) is pressed or the fire alarm
panel has been activated, the LED will illuminate AMBER and the UTILITY will be turned off.
The EM Stop button must be re-set before restarting the system.
OFF = OK
AMBER = EM Stop button pressed
5Maintenance
To keep your panel in good working order, you must follow these steps:
DO carefully remove any accumulated dust from the outer enclosure once a month.
NEVER use detergents or solvents to clean your device –this may permenantly or temporarily
damage the panel
NEVER spray air fresheners, hair spray, paint or other aerosols near the device.
NEVER paint the device. Paint will seal vents and interfere with the device.

Merlin 500S User Guide
Rev: 02 05-19 7
6500S Wiring Spec
1. UTILITY 1: Power Output, 100-240VAC, Max 3A. 50-60Hz
2. POWER: Mains electrical Input 100-240VAC Single Phase. 50-60Hz
3. AUTO RESET & BMS selection switch.
4. EM REMOTE: Remote emergency stop buttons and Fire Alarm input wired in series
(purchased separately). VOLT FREE INPUT
5. FIRE PANEL: Power supply and VOLT FREE INPUT
6. BMS OUT: Normally Closed, Common and Normally Open.

Merlin 500S User Guide
Rev: 02 05-19 8
7Manufacturer’s Warranty
3 Year Limited Warranty
Warranty coverage: The manufacturer warrants to the original consumer purchaser, that this product will be free of
defects in material and workmanship for a period of three (3) years from date of purchase. The manufacturer’s liability
hereunder is limited to replacement of the product with repaired product at the discretion of the manufacture. This
warranty is void if the product has been damaged by accident, unreasonable use, neglect, tampering or other causes
not arising from defects in material or workmanship. This warranty extends to the original consumer purchaser of the
product only.
Warranty disclaimers: Any implied warranties arising out of this sale, including but not limited to the implied warranties of
description, merchantability and intended operational purpose, are limited in duration to the above warranty period. In
no event shall the manufacturer be liable for loss of use of this product or for any indirect, special, incidental or
consequential damages, or costs, or expenses incurred by the consumer or any other user of this product, whether due
to a breach of contract, negligence, strict liability in tort or otherwise. The manufacturer shall have no liability for any
personal injury, property damage or any special, incidental, contingent or consequential damage of any kind resulting
from gas leakage, fire or explosion. This warranty does not affect your statutory rights.
Warranty Performance: During the above warranty period, your product will be replaced with a comparable product if
the defective product is returned together with proof of purchase date. The replacement product will be in warranty for
the remainder of the original warranty period or for six months –whichever is the greatest.
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]
S&S Northern Ltd is the owner of this document and reserves all rights of modification without prior notice.