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08/03/2018 

SafeAir CM 

Installation Instructions 

 
The SafeAir CM  is a ventilation interlock with built in current monitoring and gas detection.  
 
The system will ensure that any mechanical ventilation connected (supply and/or extract) is running before 
the gas can be used, when installed with gas sensors it will also monitor the atmosphere for CO and/or CO

2

.   

It will then continually monitor for fan operation. 

 
 

 

 
Before commencing installation please familiarise yourself to the equipment by reading the comprehensive 
installation instructions. If in doubt then please call 0161 233 0600. Out of hours please call 07894 684080 or 
07843 355163. 
 

 

It is a statutory requirement that this safety system is installed and commissioned 

to the satisfaction of the manufacturer. 

 

 

A commissioning certificate must be issued to the end user along with instructions for the operation of the 
equipment. 
 
As the Manufacturer Medem UK should commission this safety system whereupon a commissioning report 
will be forwarded to the installing agent who should provide a copy to the end user.  
At the point of our commissioning an individual serial number will be attached to the system along with a 24 
help line number. Photos and all relevant information for the installation will then be stored on the Medem 
site database to be accessed in the event of a call on the 24 hour help line. The warranty period for the 
panel and sender unit will then be extended to Ten years.

 

 

 

 

 

• 

Gas Detection .(up to 4 detectors ) 

• 

Built in Fan Current Monitor for Fan interlocking.  

• 

5 year warranty  - 10 years when commissioned

 

 

SafeAir CM features 

Summary of Contents for SafeAir CM

Page 1: ... installed and commissioned to the satisfaction of the manufacturer A commissioning certificate must be issued to the end user along with instructions for the operation of the equipment As the Manufacturer Medem UK should commission this safety system whereupon a commissioning report will be forwarded to the installing agent who should provide a copy to the end user At the point of our commissioni...

Page 2: ... CO2 Carbon Dioxide The system comprises of a mains powered panel capable of operating up to four sensors and internal two channel current monitor for interlocking the mechanical ventilation with a monitoring range of 30 mAmps to 24 Amps The ventilation can also be interlocked by mechanical air flow switches DP if required Control Panel The front of the panel has the following controls and indicat...

Page 3: ... B interlock for PD switches 12 Fan A current monitor CT connection 13 Fan B current monitor CT connection 14 Fill prove time for gas pressure proving AUX relay settings see No4 15 Set Fan A to use either PD switch No10 or Current Monitor CT No12 16 Lift valve button opens the gas valve only whilst the button is continuously pressed for commissioning purposes 17 Display gas pressures on the LCD sc...

Page 4: ...y dependant on the individual characteristics of the target gas that is being monitored for See the gas detectors own instructions for more guidance Detector Information Connection and addressing VE supply Comm s From either the main panel or an extender Detectors are wired in parallel and can be connected to one another daisy chain Address Selector Each detector must be set to its own address 1 4...

Page 5: ...nd between 1m and 3m from the potential source Care should be taken so they are not located close to the edge of a canopy or in direct flow of the supply or extract ventilation For additional information or guidance on site specific requirements please don t hesitate to contact us Each detector has its own Bi Colour LED which is used to indicate the status of that detector Not Lit No power comm s ...

Page 6: ...is will change the minimum trip current setting from the default 35mA to be that being used by the fans at your set speed Pressing button 19 Fan comm alone will display the new minimum trip current value If the fan load drops below that level for more than 10 seconds the system will give an alert and isolate the gas supply There is a 20 allowance for fluctuations in fan load due to temperature etc...

Page 7: ...wired in series with the EM stop buttons To EM Stop connections in the panel Indicator bar shows when pressed Normal EM Stop Activated Multiple Stop Buttons Single Stop Buttons Resetting indicator bar The stop buttons supplied by Medem are of a Push Glass key resettable style when activated a yellow indicator bar will show and the unit will require resetting using the key provided Multiple stop bu...

Page 8: ...em UK will exchange faulty valves for return to the manufacturer 5 Where a Medem UK engineer or another company appointed by Medem UK commission and installed system then that system will carry a ten year warranty This applies to the main panel and the sender unit At the time of commissioning a security label with a serial number will be attached to the main panel box photographs and a comprehensi...

Page 9: ...e system will isolate the gas and report fans not running Check that the fans are not only switched on but actually running and moving air Gas Off Reset Em Stops Switch On Off The system has an panel mounted emergency stop and connection inside for remote buttons First check the panel button once pressed some require resetting by twisting and releasing Clear the message by turning the main system ...

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