Medem AGDS-MC User manual

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AGDS-MC
Installation Instructions
The AGDS-MC is a multi channel gas detection system designed for use in boiler houses. Up to sixteen lo
voltage detectors can be connected for the detection of natural gas, LPG or carbon monoxide.
In the event of a high alarm from one of the detectors, the system ill isolate a connected control valve. Lo
alarm indication is also given
It is designed for use primarily in boiler house.
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 ith instructions for the operation of the
equipment.
As the Manufacturer Medem UK should commission this safety system hereupon a commissioning report
ill be for arded to the installing agent ho should provide a copy to the end user.
At the point of our commissioning an individual serial number ill be attached to the system along ith a 24
help line number. Photos and all relevant information for the installation ill then be stored on the Medem
site database to be accessed in the event of a call on the 24 hour help line. The arranty period for the
panel and sender unit ill then be extended to Ten years.
• Gas Detection . (Up to sixteen detectors)
• Natural gas, LPG and carbon monoxide
• Remote emergency stops
• BMS relay (Gas On/Off)
• 5 year arranty - 10 years hen commissioned
AGDS-MC features

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System description
AGDS-MC
The AGDS-MC is a gas detection system designed to monitor the atmosphere for target gases.
The system comprises of a mains po ered panel capable of operating up to four detectors (or 16 in conjunction of the AD-PP
transformer pack), either Combustible or Carbon Monoxide.
The detectors are pre-calibrated by Medem (UK) Ltd such that they only require to be connected to the panel and functionally
tested.
In the event of a high alarm from one of the detectors the system ill isolate the gas supply by closing a connected electric
control valve. Emergency stop buttons and Thermal Links can be fitted and a fire alarm can close the gas valve hen connected
to the panel.
Control Panel
Low Volta e Gas Detectors
Combustible detectors are pre calibrated at 5% LEL (Pre alarm) and 10% LEL for the High alarm.
Carbon Monoxide detectors are pre calibrated at 80ppm (pre alarm) and 100ppm for high alarm.
Connect a detector to the “detectors terminals”(6&7), each detector has a rotary address selector s itch (0-F) set to a unique
address. Once connected and addressed you are required to press the “learn Det’s” button (12). Once pressed the corresponding
detector LED’s on the main panel ill light green.
Each sensor unit has an LED hich sho s green hen po er is applied.
Note: There is a arm up period after initial po er up of approximately 90 seconds. During this time the green LED ill flash once
per second and the output signal ill be inhibited. This is to prevent spurious alarms. After the arm up period and on application
of gas, the red LED ill light hen a high gas alarm level is reached.
Emer ency Stop button
LCD Screen for clear instructions
System On/Off
S itch on to open gas valve

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Main features
AGDS-MC
Power at 230
volts from a
3amp fused spur
Connections to panel: marked on board
Connections to panel: marked on board
1. Live & Neutral 230 volts supply from 3amp s itched fuse spur
2. 230 volts out to gas solenoid valve (5amp relay)
3. Earth connection terminals
4. Gas On BMS relay (potential free contact, mains rated, max load 5amp)
5. Remote emergency stop buttons SELV, multiple buttons connect in series (requires a N/C circuit, open for alarm)
6. Po er connections for detectors, Methane, LPG, CO.
7. Comms connections for detectors, Methane, LPG, CO.
8. Unused Option button.
9. Display detectors addressed 9 to 16.
10. Display detectors addressed 1 to 8.
11. Option S itches
12. Learn Detectors - Press after connecting & addressing Medem gas sensors.
13. Enable/Disable Internal toner
14. Optional Dual BMS relay (SELV) - Factory fit only, must be requested at point of order
Option Switches (No 11) Relay A Relay B
Opt A - Off Factory set Factory set
Opt A - On Factory set Factory set
Opt B - Off Lo gas alert lo & High gas alert
lo & High gas alert Emergency Stop Opt B - On

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Wiring information
AGDS-MC
EM Stop Buttons,
Thermal links
(Normally closed)
For multiple, connect in
series.
230v Supply
3Amp Fused Spur
Gas Solenoid
Earth Connections not shown
Mains Rated
Potential free contact,
Max load 5amp’s
(latching relay)
Basic connections
Addressable Gas
detector
Set to address 1,2,3 or 4
And then press Learn (12)
Wire multiple detectors in
parallel
Any Detectors, Extension or Relay panels require connecting ith a four core screened Belden type security cable or 600v
rated BMS cable (max cable length of 100meters.)

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Remote stop buttons
AGDS-MC
To EM Stop connections in the
panel
Use terminals TB2 A & C Use terminals TB2 A & C
Remote stop buttons can be connected to the panel terminal
marked as “EM STOP” (number 6 ).
The remote buttons must be ired as sho n in order to provide a
“closed contact” for the control panel.
If thermal links are to be installed these should be wired
in series with the EM stop buttons
To EM Stop connections in the
panel
Indicator bar sho s hen
pressed
Normal EM-Stop Activated
Multiple Stop Buttons
Sin le Stop Buttons
Resettin (indicator bar)
The stop buttons supplied by Medem are of a “Push Glass, key resettable” style, hen activated a yello indicator bar ill
sho and the unit ill require resetting using the key provided.
Multiple stop buttons are ired in series.
If thermal links are to be installed these too should
be ired in series ith the EM stop buttons
Use terminal TB2 A & C

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Gas Detection
Gas Detectors
IMPORTANT - Gas Detectors should not be installed until all building, construction or painting ork etc.. Is completed, as these
orks can effect the sensitivity and longevity of the detectors.
Ensure that the protective cover labels (RED) are removed only
after the completion of all building ork and the system has
been commissioned by the Medem engineer.
The labels are required to be removed for the detectors to
operate, but removal before the completion of orks risks
contaminating the sensor element.
The system is capable of operating a mix of up to 16 detectors (additional po er pack may be required) of different types.
The detector types are:
• Carbon Monoxide.
• Combustible gases (Methane, Propane).
Detector location ill vary dependant on the individual characteristics of the target gas that is being monitored for. See the gas
detectors o n instructions for more guidance.
The maximum cable length bet een a detector and the control panel should not exceed 100 metres, hilst e ould al ays
recommend using screen cable if the distance bet een the main panel and the detectors is greater than 20metres a 1mm
screened cable must be used on the +VE, 0v terminals
All Senders, Detectors, Extension & Relay panels require a four core screened Belden type security cable or 600v rated BMS
cable (max cable length of 100meters.)
Warranty ill be void if Fire Protection Cable or cable over 1mm dia. is used on the SELV side.
AGDS-MC Detector Information
+VE supply & Comm’s
From either the main panel
Address Selector
Each detector must be set to its o n
address.
And then “leant” using button (12)
Connection and addressin
Status LED

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Detector Information
Detector location ill vary dependant on the individual characteristics of the target gas that is being monitored for.
The descriptions belo describe the position for each detector after considering these characteristics.
For proper function care must be taken not to site a detector in a “dead space” or in the flo of any ventilation.
Natural Gas/Methane
Natural gas detectors should be mounted at high level on a all approximately 150mm from the ceiling height and avoiding
corners and potential dead air areas.
Natural gas detectors should not be mounted belo the height of the top of a door ay for example. This is because as the gas
is slightly lighter than air it ill rise filling the room from the ceiling do n and ill spill through the top of a door opening into the
next room. If the detectors are mounted belo this height then it ill take longer the gas to reach the detector.
LPG /Propane
LPG gas is heavier than air so detectors need to be mounted at lo level 100mm from the floor, consideration should be given
to any potential mopping or et floor height.
Carbon Monoxide
Carbon Monoxide is similarly eighted to air so detectors should be mounted bet een 1 to 2 meters from the floor.
Carbon Dioxide
Carbon Dioxide detectors should be installed so they monitor the general level of CO2 ithin the area. They should be mounted
above standing head height and bet 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 flo 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 o n Bi-Colour LED hich is used to indicate the status of that detector.
Not Lit: No po er/comm’s. These a four ire units and all connections are required, check the polarity of both the
po er and the comm’s (MA/MB) terminals are correct. Check the detector is address to the correct channel
and the channel has been enabled using s itch (12)
Flashing Green: Detector is arming up, the detectors ill flash green on po er up for 90 seconds hile the sensor
elements stabilize. The system ill ignore any detectors hile flashing.
Solid Green: Detector is po ered and active.
Flashing Red: Lo level alarm. All detectors have both a lo and high level alarm, lo level alarms serve as a arning
that an unsafe condition maybe building and gives chance to intervene before loss of gas service.
Solid Red High level alarm. An unsafe level of the target gas have been reached and the system ill isolate the
gas supply. The cause of the alarm ill require identifying and resolving before the gas supply can be re-
established.
After installation a simple bump test can be performed by using an appropriate level test gas in order to check operation. Full
testing and calibration checking takes place during a Medem commissioning.
AGDS-MC
Detector Location information
Detector Indications

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Warranty
AGDS-MC
Medem (UK) Limited
Project House
19 Dallimore Road
Manchester
M23 9NX
Tel: [phone]
Fax: [phone]
Web: .medem.co.uk
E-mail: [e-mail]
Medem UK Warranty
Terms & Conditions
1. The arranty is a parts arranty and Medem UK Ltd ill not cover or accept any labour or
other expenses that may be incurred in the process of changing faulty product.
2. All panels and sender units are covered by a five year arranty.
3. Gas detector units and other remote detectors carry a t o year arranty. Installation of the
detectors should not be undertaken until all building and construction ork is completed.
4. Gas solenoid valves carry the original manufacturers arranty, though as the supplier
Medem UK ill 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 ill carry a ten year arranty. This applies to the
main panel and the sender unit. At the time of commissioning a security label ith a serial
number ill be attached to the main panel box. photographs and a comprehensive record
of the installation ill be held by Medem UK.
6. Where a arranty claim is made then, here appropriate, a ritten order to attend site
must be provided to Medem UK A cost for labour and travel to site ill be prepared as a
quote. The cost must be included in the order.
7. Where it is found that the installation and/or the quality of orkmanship has contributed to
or holly caused the failure of the product then e reserve the right to charge the hole or
a proportion of the cost of the faulty item.

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It is essential that the installation is carried out in the order given
belo to ensure the correct operation of the system.
First read the system description sheet before follo ing the
instructions belo
1. Connect the Control valve t in & earth to the marked terminals.
2. Connect BMS, beacons, sounders etc to the relay outputs.
3. Connect any additional EM stop buttons and thermal links in series to the terminals marked “em stop”
4. Each detector has a blue rotary s itch and each s itch should be set to a different number or letter starting ith “0”. Then
connect the gas detectors to terminals marked “detectors” on the panel. Detectors can be ired “Daisy chain”.
5. Connect the 3 amp fused spur 240 volt supply to marked terminals.
6. Once po er is connected to the panel the detectors ill flash the green LEDs for 90 seconds after hich the LEDs ill be on
continuously.
7. Press the “learn field button” this is on the main circuit board on the right hand side, just over half ay up the board.
Pressing this once allo s the panel to learn ho many and hich type of detectors are fitted.
8. Press and keep pressed the “display detectors” button hilst checking on the LCD display that all the detectors have been
recognised by the panel. A recognised detector ill appear as “CO” or “CM” in the second section of each ro . Count the
number of “seen” Detectors on screen and ensure total is the same as the number of detectors installed. NM in the third
column means that number is not monitored. If more then 8 detectors are fitted then press the second button labelled
display detectors. Note that a detector set at 0 appears as 1 on the LCD and a detector set as 1 appears as 2 on the LCD etc.
9. At this point turn the on/off s itch to the on position and provided there are no leaks the panel ill allo gas and the gas on
LED ill light. Should there be lo level gas detected the panel ill Alarm and the alert LED ill flash. If there is a high level of
gas detected the valve ill close and the panel ill sound and the alert LED ill flash.
10. A functionality test of the Methane detectors can be carried out by applying a small amount of lighter gas. The detector LED
ill turn red and the panel ill alarm and close the valve.
Checklist
AGDS-MC
Please do not hesitate to call for advice on the
followin numbers:
0161 233 0600 office hours
Or out of hours call:
Notes.
It is recommended that all systems are commissioned aer installaon by Medem UK This will extend the warranty period from 5
years to 10 years and ensure the system is working as designed
Please see warranty condions that came with the main panel