SEC-L Operating and Maintenance Operation

SEC-L Operating and Maintenance
Operation
Turn the main system switch to the on position, the LCD will display the message “Select Service”
also at this point any gas or temperature detectors that are connected are now active and being
monitored and the LCD will report “Detectors Active”. Press one of the yellow coloured service
buttons to active the desired service.
Normal operating procedure for electric (with the panel enabled)
Press ‘ELEC’ button.
Electric should now be available for use.
Press ‘ELEC’ button again to isolate
Normal operating procedure for Water (with the panel enabled)
Press ‘WATER’ button
Water should now be available for use.
Press ‘WATER’ button again to isolate.
Normal operating procedure for gas (with the panel enabled)
Press ‘GAS’ button and wait for testing cycle to complete.
Gas should now be available for use. (If not see below for more information)
Open gas outlets and use as normal.
Press ‘GAS’ button again to isolate, and ensure gas outlets are closed.
All services can be isolated together by switching the main switch to ‘OFF’
Maintenance and testing
The fill time should be set at installation long enough to ensure the downstream pipe work comes
up to pressure.
(factory default 5 seconds)
The prove time should be set at installation to find the smallest possible leak.
(factory default 50 seconds)
To test all features the system.
If any mechanical ventilation is interlocked, do not switch the ventilation yet; turn on the SEC-L
first:
Turn the main system switch to the on position, the LCD will display the message “Select Service”
also at this point any gas or temperature detectors that are connected are now active and being
monitored and the LCD will report “Detectors Active”. Press one of the yellow coloured service
buttons to active the desired service.
Press the gas button and the system will indicate an alarm state and a message relating to
ventilation not running will be displayed and the gas will remain isolated.
Isolate the incoming gas supply to the laboratories; turn the SEC-L off & on and press the gas
button again:
The system will indicate an alarm state and a message relating to insufficient gas pressure will be
displayed and the gas will remain isolated.
Continued..
Medem (UK) Limited
L&M Business Park , Norman Road
Altrincham, Cheshire,
WA14 4ES
Tel: +44 (0) 161 233 0600
Fax:+44 (0) 161 233 0601
www.medem.co.uk
e-mail:sales@medem.co.uk
Cert No. 10213
Re-establish the gas supply and switch on any ventilation (if interlocked); open a gas tap so that a
demand is being made on the gas supply: turn on the SEC-L and press the gas button:
The system will begin a pressure test and indicate an alarm state, a message relating to close all
gas outlets will be displayed and the gas will remain isolated.
Close the gas tap and re-test the gas.. The gas test should successfully complete, if the gas test
fails and you have checked all outlets are closed you have a gas leak and require a gas engineer
to check the pipe work..
With the gas proven and available for use, breathe onto the CO2 sensor (where fitted):
The system will indicate a rise in CO2 and advise the operator to increase any available ventilation.
If this is not done and a level of CO2 remains present at the sensor the panel will go into a high
alarm condition and isolate the gas supply.
The systems are currently set to 2800ppm low alarm and 5000ppm high alarm.
All of these procedures are dynamically carried out by the SEC-L system each and every time it is
switched on. The system should only be turned on during a lesson and switched off when the gas
is not in use so the gas supply remains isolated.
There should be a manual operational test on any installed Emergency stop buttons, which when
operated will isolate the gas supply and remain isolated until a manual reset is completed.
If utilized an auto stop time out will isolate the gas, water and electric after the set period (default
6hrs).
A yearly test and inspection of the solenoid valve and let by test should be carried out by a qualified
technician i.e. Gas safe registered engineer.
The system should be switched off using the main system on/off switch at the end of
a lesson/service so a new pressure test can be completed ensuring there are no leaking
appliances or students have not left any gas taps or appliances open.
Due to the Medem SEC-L being a digital system that checks its self every time it is switched on
there are no recalibration requirements.
If fitted, the detectors are designed to have very low drift so recalibration on site is not required but
should be replaced every 5 years in a clean environment but consideration should be given to
replacement after 3 years if contamination is a possibility. A functionality test should be carried out
every 6-12 months.
The gas, electric and water supply are controlled by the soft touch switches after the panel has
been enabled with the system switch position set to ON
If at any time there is an alert or the sounder sounds follow the on screen instructions,
further information can be found both in the installation instructions or by contacting
Medem (UK) Ltd.
Medem (UK) Limited
L&M Business Park , Norman Road
Altrincham, Cheshire,
WA14 4ES
Tel: +44 (0) 161 233 0600
Fax:+44 (0) 161 233 0601
www.medem.co.uk
e-mail:sales@medem.co.uk
Cert No. 10213