background image

Installation, Operation & Maintenance            

                                                                       

Mini-Merlin 

 

Rev: 20   12-20 

1  

 

 

MINI MERLIN 

CH

4

 

CO: DUAL GAS DETECTOR

 

Methane & Carbon Monoxide 

 



Installation, Operation & Maintenance 

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 (CH

4

) and 

Carbon Monoxide (CO) in the air. If there is a dangerous build-up of gas at the sensor, this device can shut off the gas 
supply via a gas safety valve and /or gas fired appliance(s). This device has additional features for resetting systems, 
as well as audible and visual alarms - It can also be integrated with a Building Management System (BMS). 

 

 

 

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

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

 

Summary of Contents for Mini Merlin

Page 1: ...onoxide CO in the air If there is a dangerous build up of gas at the sensor this device can shut off the gas supply via a gas safety valve and or gas fired appliance s This device has additional features for resetting systems as well as audible and visual alarms It can also be integrated with a Building Management System BMS The information contained within this manual should be referenced for typ...

Page 2: ...lding Management System Integration 11 Specification 11 OPERATION 12 First Power Up 12 Reset the Device 12 Manual Operation Test 12 Display Overview 12 Power Off 12 Gas Level Alarms 13 Remote Shut Off Screen 13 End of Life Screen 13 MAINTENANCE TESTING 14 Cleaning 14 Manual Operation Test 14 Gas Testing Overview 14 Gas Sensor Types Reaction Times 14 Gas Testing Kits 15 Mini Merlin Gas Testing Proc...

Page 3: ...eguard individuals with specific medical conditions If in doubt consult a doctor physician Your product should reach you in perfect condition if you suspect it is damaged contact your supplier Manufacturer s 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 two 2 years from d...

Page 4: ...els Generally above 100ppm This should be treated as an urgent situation Medium levels Generally between 50ppm to 100ppm This should be cause for concern and should not be ignored or dismissed Low levels Maximum acceptable indoor level of CO is 9ppm Anything above this level may cause possible health effects with long term exposure See the specification table for how your device monitors Carbon Mo...

Page 5: ...PTOMS OF METHANE GAS EXPOSURE Methane gas is relatively non toxic and associated with being a simple asphyxiator displacing oxygen in the lungs However Methane is extremely combustible Exposure to high levels of Methane can cause Suffocation Loss of consciousness Headache and dizziness Nausea and vomiting Weakness Loss of co ordination Increased breathing rate METHANE GAS LEVELS The LEL Lower Expl...

Page 6: ...s Locations for detectors will vary based on the intended application they should be located near identified sources of a potential gas leaks pockets where hazardous gas could quickly accumulate and areas of identified consequential risk A 6ft from sources of combustion e g boiler s heaters gas fired appliances etc B 4ft from draft zones and ventilation areas e g windows doorways and A C units etc...

Page 7: ...rear cover mark the screw holes to the wall or align with the electrical box If mounting direct to wall ensure the wall surface is flat to prevent base distortion 3 There are pre fractured areas for cable entry and barrier to separate low and high volt connections 4 Mount at 5 feet from ground level and in accordance with any applicable regulations 5 After executing the mounting and connections se...

Page 8: ...e device can be used to isolate the gas supply for multiple appliances Use an external transformer not supplied to close a 24VAC gas solenoid valve that could supply gas to one or more appliances Gas Supply Controlled by 100 120VAC Solenoid Valve Gas Supply Controlled by 24VAC Solenoid Valve We do not recommend installing a gas solenoid valve with standing pilots If you use a gas solenoid valve pl...

Page 9: ...liance Multiple appliance limit switches can be wired in series ADAPTABLE OUTPUTS The mini merlin can be used to effect external relays and contactors to disable multiple appliances when a fault condition is detected Multi pole relays can interrupt power to electrical circuits controlling boiler valves and pumps Low voltage wiring is to be inserted into the external limit circuit of a gas applianc...

Page 10: ...ample as shown REMOTE SHUT OFF 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 This terminal is normally closed and will alarm when energised open isolating the gas supply When using this input only the mains utility output shall de energize If you are using the CO ...

Page 11: ...ariety of purposes including triggering alarm contacts operating and external relay for multiple appliance shut down and generating status signals for a BMS system Specification Product Mini Merlin Version CH4CO Display 1 8 TFT Thin Film Transistor Screen Brightness Non adjustable Initial Stabilisation Time 60 Seconds approx Power Input Voltage 100 120Vac 50 60Hz Valve Output Voltage 100 120Vac 50...

Page 12: ...indicator will remain red to alert the user that a high dangerous level of gas has been detected until the device is reset Manual Operation Test This option gives the user the opportunity to test each output contact in response to gas Press and hold the Touch button during normal operation Display Overview The user can choose whether to have the audible buzzer sound when gas levels are detected Fo...

Page 13: ...fe until the device is reset by pressing the Touch button once Remote Shut Off Screen This message will display if the device is integrated with remote shut off devices such as smoke or fire alarms etc When activated the device will isolate the gas supply if configured to do so End of Life Screen This message indicates that the devices gas sensing elements have reached their expected operational l...

Page 14: ...ts sensitivity can be inhibited by external factors such as dust humidity temperature fluctuations cleaning products contaminants or sensor drift ageing All can cause a decline in sensitivity and eventual failure Regular bump tests are important to make sure a device is able to detect a release of gas as early as possible We recommend that gas tests are carried out at least annually from the date ...

Page 15: ... regulator pressure gauge if available will indicate cylinder pressure 4 Offer up the applicator hose cone and apply to the top vents of the device 5 Open the valve regulator to allow the gas to be delivered at a pre set flow rate 6 Apply gas 7 The device will enter alarm status after a short period of time 8 The device will activate all configured outputs relays At this point 9 Remove applicator ...

Page 16: ...ders should be stored in a vertical position secured to prevent them falling over Keep away from all sources of ignition Store in well ventilated areas Do not lift single cylinders by the valve device unless they are designed for that purpose Ensure valve regulators are screwed and secured tight Always remove the regulator valve after use and at the end of each working day Do not remove or deface ...

Page 17: ...Installation Operation Maintenance Mini Merlin Rev 20 12 20 17 Engineers Notes Blank ...

Page 18: ...Installation Operation Maintenance Mini Merlin Rev 20 12 20 18 Test Record Date Gas Details Pass Sign ...

Page 19: ...Installation Operation Maintenance Mini Merlin Rev 20 12 20 19 Date Gas Details Pass Sign ...

Page 20: ...ser Date of Installation Installation Location Organisation Stamp Signature of the installer American Gas Safety LLC Head office 6304 Benjamin Road Suite 502 Tampa FL 33634 Tel 727 608 4375 info americangassafety com American Gas Safety LLC is the owner of this document and reserves all rights of modification without prior notice ...

Reviews: