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System description

 

SEC-Lg 

System On/Off enables gas detection and use of the 

soft touch GAS  button 

A

 Blind button for displaying gas pressures on the LCD screen 

Blind button for displaying first 8 detectors (Gas & temperature) on the LCD screen.  

Multi gas detection, air quality monitor and gas pressure proving system 

 

The SEC-Lg system comprises of a mains powered main control panel, and low voltage pressure sender unit and fitting kit. The 
pressure sender unit it mounted onto the gas valve  (with the fitting kit) and transmits the gas pressure information back to the 
main panel in order to preform its integrity test. 

    Control Panel 

The front of the panel has the following controls and indications: 

 

Emergency stop button. 

 

System On/Off switch. 

 

Yellow soft touch On/off buttons for gas. 

 

White Blind buttons 

A

 and 

for engineer functions. 

 

LED indications: 

 

Power On - green………..

A: 

blind button for displaying gas pressures on the LCD screen 

 

Gas - red  when active to warn of liver service 

 

Fans running light – yellow…

B: 

blind button for displaying connected devices (detectors & temperature) on the LCD screen 

 

LCD display: 

 

For displaying system status during both installation and normal use, also for displaying diagnostics 

 

Pressure sender unit 

Pressure sender unit transmits pressure information back to the main panel in order for it to preform its integrity test. Its is not 
optional and must be connected, 

the system will not work without it. 

 

 
It is mounted to the gas solenoid valve inlet and outlet test ports using 8mm OD copper pipe. Use the appropriate Medem fitting 
kit to fit the control valve size 

(see page 10,11)

 

The pressure sender is connected to the control panel with low voltage two core  screened cable using the terminal marked A & 
B.   

NOTE: This is low voltage and should be segregated from mains wiring. 

   Pressure Sender Unit 

Summary of Contents for SEC-Lg V4

Page 1: ...ety 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 A...

Page 2: ...ns A and B for engineer functions LED indications Power On green A blind button for displaying gas pressures on the LCD screen Gas red when active to warn of liver service Fans running light yellow B...

Page 3: ...ure check will isolate gas supply if pressure exceeds 70 mbar 17 Fill prove time for gas pressure proving see page 5 18 Timer adjustment for fan commissioning allows timed period for gas installation...

Page 4: ...as detectors 1 8 press A B together to view 9 16 Fire Test Mode Press button B three times When connected to a fire alarm panel using the fire alarm terminal no 13 the system will isolate the gas duri...

Page 5: ...1 Option Headers 18 19 21 20 Fan comm To enable the commissioning of the gas portion of the system before the ventilation interlock is completed you may temporarily disable the interlocking by pressin...

Page 6: ...e the gas detectors own instructions for more guidance SEC Lg Detector Information VE supply Comm s From either the main panel or an extender Detectors are wired in parallel and can be connected to on...

Page 7: ...een 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...

Page 8: ...iple connect in parrallel Live feed through the Medem CM2M K2 channel current Monitor fans Fan speed controls Fan live Supply Fire Alarm Requires a volt free NC contact Where using 3 phase fans interl...

Page 9: ...s fitted the correct way round Note there is no flow through the pressure sender unit it is purely reading the pressures either side of the valve Correct Pressur e Solenoid Never mount the valve such...

Page 10: ...Solenoid coil of the valve should never be mounted below the horizontal Pressure sender unit should never be mounted upside down to protect from water ingress Approx 400mm length INLET PORT OUTLET PO...

Page 11: ...ld be 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 indicat...

Page 12: ...er Medem 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...

Page 13: ...essed the display detectors button whilst checking on the LCD display that all the detectors have been recognised by the panel A recognised detector will appear as CO Carbon Monoxide CM combustible CH...

Page 14: ...ssure test If at any point the fans stop running opening the S1 or E1 contact the system will isolate the gas and report fans not running Check that the fans are not only switched on but actually runn...

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