DMS MINI MERLIN Installation & Operation Manual

Ch4 co: dual gas detector

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Installation & Operation Manual

Your new Mini Merlin is a dual gas sensor carefully designed and tested to monitor levels of Methane

(CH4) / Natural Gas and Carbon Monoxide (CO) in the air. If there is a dangerous build-up of gas or

unsafe levels of carbon monoxide at the sensor, this device can shut off the gas supply via a gas safety

valve and /or a gas fired appliance. This device has additional features for resetting systems, as well as

X-Cel House, Chrysalis Way, Langley Bridge,

audible and visual alarms - It can also be integrated with a Building Management System (BMS).

Eastwood, Nottinghamshire NG16 3RY

The information contained within this manual should be referenced for typical installation and operation

+44 (0) 1773 534555

only. For specific requirements that may deviate from the information in this guide – contact your supplier.

sales@dmsltd.com

dmsltd.com

Rev: 11 09-20

MINI MERLIN

CO: DUAL GAS DETECTOR

Methane (Natural Gas) & Carbon Monoxide

Installation & Operation Manual

Please read this manual carefully and retain for future use.

Mini Merlin



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Summary of Contents for DMS MINI MERLIN

Page 1 Please read this manual carefully and retain for future use. Your new Mini Merlin is a dual gas sensor carefully designed and tested to monitor levels of Methane (CH4) / Natural Gas and Carbon Monoxide (CO) in the air. If there is a dangerous build-up of gas or unsafe levels of carbon monoxide at the sensor, this device can shut off the gas supply via a gas safety valve and /or a gas fired appliance.
Page 2: Table Of Contents
Installation & Operation Manual Mini Merlin CONTENT IMPORTANT SAFETY INSTRUCTIONS ............3 Manufacturer’s Warranty ..................... 3 CARBON MONOXIDE GAS ................. 4 General Information ..................... 4 METHANE GAS ................... 5 General Information ..................... 5 INSTALLATION ................... 6 Planning ........................... 6 Typical Location and Positioning................6 Mounting .........................
Page 3: Important Safety Instructions
Installation & Operation Manual Mini Merlin IMPORTANT SAFETY INSTRUCTIONS Before any installation, use or maintenance read this manual carefully. The information contained within this manual 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.
Page 4: Carbon Monoxide Gas
Installation & Operation Manual Mini Merlin CARBON MONOXIDE GAS General Information Carbon monoxide (CO) is a poisonous, colourless, odourless, and tasteless gas. Although it has no detectable odour, CO is often mixed with other gases that do have an odour. So, you can inhale carbon monoxide right along with gases that you can smell and not be aware that CO is present.
Page 5: Methane Gas
Installation & Operation Manual Mini Merlin METHANE GAS General Information Methane gas comes from the earth and it comes from our bodies. Methane is non-toxic and it can be harnessed as an energy source. However, methane is highly explosive and it can cause death by asphyxiation.
Page 6: Installation
Installation & Operation Manual Mini Merlin INSTALLATION Planning Our monitors should be installed in areas at risk of gas leaks e.g. over boilers, valves or meters. Take in to account the design of the air flow patterns within the zone area.
Page 7: Mounting
Installation & Operation Manual Mini Merlin Mounting Unpack all the parts! 1. Carefully remove the rear cover from the unit by releasing the two latching clips with a small flathead screwdriver. 2. Using the rear cover - mark the screw holes to the wall or align with the electrical box.
Page 8: Circuit Board Overview
Installation & Operation Manual Mini Merlin Circuit Board Overview Wiring Gas Valve Output A gas solenoid valve should be powered using the terminals marked [VALVE OUT]. When the valve out terminal is wired to a normally closed (NC) gas solenoid valve, the device can be used to isolate the gas supply for multiple appliances.
Page 9 Multiple appliance limit switches can be wired in series. Remote Shut-Off Connections Your mini merlin can be integrated with remote devices with an open /close circuit via the Remote Shut-Off volt free switch terminal. This terminal has a factory fitted link installed.
Page 10: Auto Reset & Buzzer Switches
Auto Reset & Buzzer Switches There are two dip-switches on the circuit board. In the event of a power loss – the mini merlin will In the event of a power loss – the mini merlin will need to be reset manually when power is restored.
Page 11: Operation
Installation & Operation Manual Mini Merlin OPERATION First Power Up  Supply 100-240Vac electrical power  Press and hold the touch button for ~3 seconds. The device enters a stabilisation phase for approximately one minute – during this period the device is not yet ready for gas detection.
Page 12: Gas Level Alarms
Installation & Operation Manual Mini Merlin Gas Level Alarms When alarms reach a RED status the maximum concentration level detected will be saved and the screen value will switch between the maximum (MAX) and the real time current value. Remote Shut Off Screen This message will display if the device is integrated with remote shut off devices such as smoke / fire alarms.
Page 13: General Maintenance
Installation & Operation Manual Mini Merlin General Maintenance Keep your device in good working order follow these basic principles; DO carefully remove any accumulated dust from the outer enclosure once a month by using a slightly damp cloth. NEVER use detergents or solvents to clean your device – this may permenantly or temporarily damage the gas sensing elements.
Page 14: Bump Testing
Installation & Operation Manual Mini Merlin Bump Testing What is Bump Testing? Bump testing is a term used for checking a gas detector is functioning correctly by exposing it to the target gas. A known concentration of the target gas is applied to the device to trigger an alarm condition and ascertain the detector is working safely.
Page 15 Installation & Operation Manual Mini Merlin Notes X-Cel House, Chrysalis Way, Langley Bridge, Eastwood, Nottinghamshire NG16 3RY +44 (0) 1773 534555 sales@dmsltd.com dmsltd.com Rev: 11 09-20...
Page 16: Installation Details
Installation & Operation Manual Mini Merlin INSTALLATION DETAILS Please pass this manual to the system owner / user. Date of Installation: Installation Location: Organisation: Stamp / Signature of the installer: X-Cel House, Chrysalis Way, Langley Bridge, Eastwood, Nottinghamshire NG16 3RY +44 (0) 1773 534555 sales@dmsltd.com...