Merlin 1500S User Guide
Rev: 07 05-19 1
Gas Safety Products
Merlin 1500S
Gas & Ventilation Interlock system
User Guide
Please read this guide carefully and retain for future use.
Merlin 1500S User Guide
Rev: 07 05-19 2
Table of contents
1 General Information ............................................................................................ 3
1.1 Panel Mounting. .............................................................................................................. 3
2 Circuit Board Terminals ....................................................................................... 4
4
2.1 POWER .............................................................................................................................. 4
2.2 GAS VALVE ...................................................................................................................... 4
2.3 SUPPLY FAN & EXTRACT FAN PD SWITCHES................................................................... 4
2.4 BMS OUT ........................................................................................................................... 4
2.5 EM REMOTE ...................................................................................................................... 4
2.6 GAS DETECTOR ................................................................................................................ 5
2.7 FS 1/2/3/4 ......................................................................................................................... 5
2.8 CO2 MONITOR................................................................................................................. 5
2.9 12V DC ............................................................................................................................. 5
3 Installation & Operation ...................................................................................... 6
3.1 System ON and OFF ........................................................................................................ 6
3.2 Emergency Shut Off........................................................................................................ 6
3.3 BMS integration ............................................................................................................... 6
3.4 Fan Switch Integration .................................................................................................... 6
3.5 Fire alarm integration ..................................................................................................... 7
4 Panel LED status ................................................................................................... 7
5 Maintenance ....................................................................................................... 8
6 1500S Wiring Spec .............................................................................................. 9
7 Manufacturer’s Warranty .................................................................................. 12
Merlin 1500S User Guide
Rev: 07 05-19 3
1 General Information
The Merlin 1500S is a gas and ventilation interlock panel.
The Merlin 1500S can receive connections from up to four external remote air pressure
differential switches or current monitors, remote emergency shut-off buttons, gas detectors and
a Merlin 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.
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.
The PCB should be removed before drilling entry holes into the case.
Important Warning Statements
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 1500S User Guide
Rev: 07 05-19 4
2 Circuit Board Terminals
2.1 POWER
A 110-240VAC electrical supply should be externally fused at 3A
and connected to the terminals marked [POWER LNE].
2.2 GAS VALVE
The 110-240VAC gas solenoid valve should be powered using the
terminals on the Merlin 1500S detailed [GAS VALVE LNE].
2.3 SUPPLY FAN & EXTRACT FAN PD SWITCHES
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 as shown.
Wiring to switches & current monitors should be made using
two-core volt free connections.
If only one fan is being used the terminals not in use should be
left linked out.
2.4 BMS OUT
Terminal connections are available on the circuit board for connections to
Building Management systems.
This is a relay that changes state in alarm or when gas is on/off and can be
used in conjunction with the [12VDC] output and other external relays that
affect other devices and controls such as purge fans, audible alarms etc.
Detailed on the circuit board as [BMS OUT] normally closed (N/C),
common (COM) and normally open (N/O). These are volt free connections.
2.5 EM REMOTE
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 1500S.
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