Medem AGDS-M User manual

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AGDS-M
Installation Instructions
The AGDS-M is a four channel gas detection system. Up to four low voltage detectors can be connected for
the detection of natural gas LPG CO CO2 and Oxygen.
In the event of a high alarm from one of the detectors the system will indicate locally and provides contacts
for remote monitoring or to activate a beacon/sounder or fan.
The system will automatically reset after the target gas detected has fallen below its alarm level. Low alarm
indication is also given.
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 will then be extended to Ten years (detectors warranty is two years).
• Gas Detection (up to 4 detectors )
• Natural gas LPG and carbon monoxide
• 2 x BMS relay (selectable alarm status inc. high
alarm)
• 5 year warranty - 10 years when commissioned
AGDS-M features

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System description
AGDS-M
A Mute button to mute the internal tone
B Reset button for resetting and opening the valve after an alert/alarm condition.
A B
The AGDS-M is a gas detection system designed to monitor the atmosphere for target gases. The system comprises of a mains
powered panel capable of operating up to four sensors either combustible or Carbon Monoxide gas or a mixture of both. The
sensors are pre-calibrated by Medem (UK) Ltd such that they only require to be connected to the panel and functionally tested.
The system is designed to auto reset from a high alarm condition after the target gas has fallen below the alarm level.
In the event of a high alarm from one of the sensors the system will indicate locally and provides contacts for remote monitoring
The system will automatically restart after a power failure.
Control Panel
The front of the panel has the following controls and indications:
Mute button for the internal toner.
Reset button for clearing an alert
LCD display:
For displaying system status during both installation and normal use also for displaying diagnostics

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Main features
AGDS-M
Connections to panel: marked on board
1. Live & Neutral 230 volt supply from 3amp switched fuse spur
2.
3. Earth connection terminals
4. AUX 1 BMS Relay
5. AUX 2 BMS Relay
6.
7. Fire Alarm Panel connection (requires N/C volt free contact in the Fire Panel)
8. Power connections for detectors Methane LPG CO CO2 Oxygen Temperature
9. Comms connections for detectors Methane LPG CO CO2 Oxygen Temperature
10. Panel Mode switches (factory set do not alter)
11. Internal tone on/off
12. Spare
13. Learn field device button press once only when all detectors are connected and powered.
14. Display detector information 1 & 2 on screen
15. Display detector information 3 & 4 on screen
16. BMS Relay setting (see page 4 for details)
Power at 230
volts from a
3amp fused spur
16
1 2 3 4 5 7 8 9
10
11
12
13
14
15
17 18
19
Medem
Gas detectors
Multiple
connect in
parallel
Fire Alarm
Requires a volt
free NC contact
Earth Connections not
shown
230v Supply
3Amp Fused Spur BMS Relays
See table on page 4 for
settings.

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System Settings
AGDS-M
Status
A 1 A 2 A 3 A 4
EM Stop - ES OFF OFF ON OFF
Fire Panel Active -FA ON OFF ON OFF
High Alarm - HA OFF ON ON OFF
Low Alarm - LA ON ON ON OFF
Gas On/Off OFF OFF OFF ON
Detector Fault - DF ON OFF OFF ON
Generic Fault (ES FA HA LA DF) OFF ON OFF ON
There are two mains rated relays 4 & 5 for connection to a BMS or sounder/Beacon. Each relay is able to be set to
report one of the status in the table below.
Max switching 230 volts 5amp’s
4, 5 & 16. BMS Relays and setting switch
Notes.
It is recommended that all systems are commissioned aer installaon by Medem UK. This will e tend 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
16
Learn Dets.
Any gas detectors connected to the system will require “learning”. First ensure all detectors are set to a
unique ID address using the selector switch on the detectors themselves (address’s 1 to 4). Having
addressed each detector press the learn Dets button (13) the system will scan and store any connected
detectors.
Shows Dets 1&2 3&4.
To verify that all detectors have been successfully learnt use the Show Dets buttons 14/15 to verify the
detectors are connected correctly.
13, 14 & 15 Learn and Display Detectors
13
14
15

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Gas Detection
Gas Detectors
IMPORTANT - Gas Detectors should not be installed until all building construction or painting work etc.. Is completed as these
works 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 work 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 works risks
contaminating the sensor element.
The system is capable of operating a mix of up to 4 detectors of different types.
The detector types are:
• Carbon Dioxide.
• Carbon Monoxide.
• Combustible gases (Methane Propane).
• Oxygen depletion.
Detector location will vary dependant on the individual characteristics of the target gas that is being monitored for. See the gas
detectors own instructions for more guidance.
AGDS-M Detector Information
+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 and then “learnt” using
button (13 see page 4)
Connection and addressing
Status LED
All current wiring regulations must be followed with reference to running low and mains voltage cables together.
The maximum cable length between a detector and the control panel should not exceed 100 metres if the distance between
the main panel and the detectors is greater than 20metres a 1mm screened cable must be used on the +VE 0v terminals
Gas detectors require a four core screened Belden type security cable or 600v rated BMS cable (max cable length of
100meters.)
Remote emergency stops and thermal links require a two core screened cable.
Warranty will be void if Fire Protection Cable or cable over 1mm dia. is used on the SELV side.
When addressing gas detectors CO &
CO2 detectors must be numbered
before natural gas detectors.

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Detector Information
Detector location will vary dependant on the individual characteristics of the target gas that is being monitored for.
The descriptions below 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 flow of any ventilation.
Natural Gas/Methane
Natural gas detectors should be mounted at high level on a wall approximately 150mm from the ceiling height and avoiding
corners and potential dead air areas.
Natural gas detectors should not be mounted below the height of the top of a doorway for example. This is because as the gas
is slightly lighter than air it will rise filling the room from the ceiling down and will spill through the top of a door opening into the
next room. If the detectors are mounted below this height then it will take longer the gas to reach the detector.
LPG /Propane
LPG gas is heavier than air so detectors need to be mounted at low level 100mm from the floor consideration should be given
to any potential mopping or wet floor height.
Carbon Monoxide
Carbon Monoxide is similarly weighted to air so detectors should be mounted between 1 to 2 meters from the floor.
Carbon Dioxide
Carbon Dioxide detectors should be installed so they monitor the general level of CO2 within the area. They should be mounted
above standing head height and 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. These a four wire units and all connections are required check the polarity of both the
power and the comm’s (MA/MB) terminals are correct.
Flashing Green: Detector is warming up the detectors will flash green on power up for 90 seconds while the sensor
elements stabilize. The system will ignore any detectors while flashing.
Solid Green: Detector is powered and active. Note: The detectors will still require correctly addressing (using the address
selector pot) and learning by the system using button (13 see page 4).
Flashing Red: Low level alarm. All detectors have both a low and high level alarm low level alarms serve as a warning
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 will isolate the
gas supply. The cause of the alarm will 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-M
Detector Location
Detector Indications

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Remote stop buttons
AGDS-M
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 wired as shown 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 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 buttons are wired in series.
If thermal links are to be installed these too should
be wired in series with the EM stop buttons
Use terminal TB2 A & C

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Warranty
AGDS-M
Medem (UK) Limited
Project House
19 Dallimore Road
Manchester
M23 9NX
Tel: [phone]
Fax: [phone]
Web: www.medem.co.uk
E-mail: [e-mail]
Medem UK Warranty
Terms & Conditions
1. The warranty is a parts warranty and Medem UK Ltd will 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 warranty.
3. Gas detector units and other remote detectors carry a two year warranty. Installation of the
detectors should not be undertaken until all building and construction work is completed.
4. Gas solenoid valves carry the original manufacturers warranty though as the supplier
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 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 comprehensive record
of the installation will be held by Medem UK.
6. Where a warranty claim is made then where appropriate a written order to attend site
must be provided to Medem UK A cost for labour and travel to site will 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 workmanship has contributed to
or wholly caused the failure of the product then we reserve the right to charge the whole or
a proportion of the cost of the faulty item.

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It is essential that the installation of the AGDS-M is carried out in the order given
below to ensure the correct operation of the system.
First read the system description sheet before following the
instructions below
1. Connect any additional EM stop buttons or thermal links in series to the terminals marked “EM stop” (6)
2. Each detector/device has a rotary address switch each switch should be set to a different number 1-4. Then connect the gas
detectors to terminals marked “detectors” on the panel. Detectors are wired in parallel. “Daisy chain” (08 & 09 )
3. Connect fire alarm ensure volt free n/c (7)
4. Ensure any BMS connections are made to the relays (4 & 5)
5. Connect the 3 amp fused spur 240 volt supply to marked terminals.
6. Once power is connected to the panel the detectors will flash the green LEDs for 90 seconds after which the LEDs will be on
continuously.
7. Press the “learn field button” (13) this is on the main circuit board on the right hand side just over half way up the board
pressing this once allows the panel to learn how many and which type of detectors are fitted.
8. Press and keep pressed the “display detectors1-2 or 3-4” button whilst checking on the display that all the detectors have
been recognised by the panel.
9. At this point press the “reset” button the panel will open the gas valve.
Checklist
AGDS-M
Please do not hesitate to call for advice on the
following number:
0161 233 0600 office hours
In the event of any alert the system will always give a reason on screen as to the
cause.
Common messages you may receive are shown below with further explanation.
If you require any help or if anything is unclear then please contact technical support on 0161 233 0600
messages
Detector fault
The system believes it has lost connection to a detector on address XX verify detector addresses and press the “learn button” (23).
Verify all connected detectors are being registered by using the “Show Dets” buttons 14 & 15. If you have no detectors connected to
the system pressing the learn button will clear the error message.