Medem AGDS-2em v2 User manual

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AGDS-2em v2
Installation Instructions
The AGDS-2em v2 is a single or two channel gas detection system.
Up to two low voltage detectors can be connected for the detection of natural gas LPG carbon monoxide
carbon dioxide and oxygen depletion.
In the event of a high alarm from one of the detectors the system will isolate a connected control valve.
Low alarm indication is also given.
It is designed for use primarily in boiler house.
Product Dimensions 180mm x 130mm x 70mm
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. (one or two detectors)
• Natural gas LPG carbon monoxide & carbon dioxide
• Remote emergency stop & Fire Alarm monitoring
• BMS relay (selectable alarm status inc. high alarm)
• 5 year warranty - 10 years when commissioned
AGDS-2em v2 features

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System description
The AGDS-2em V2 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 two Medem sensors
The sensors 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 sensors the system will 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 when connected to the
panel.
Control Panel
Low oltage Gas Detectors
Combustible detectors are pre calibrated at 5% LEL low alarm and 10% LEL for the high alarm.
Carbon Monoxide detectors are pre calibrated at 20ppm low alarm and 30ppm for high alarm.
Carbon Dioxide detectors are pre calibrated at 2800ppm low alarm and 5000ppm for high alarm.
Connect a detector to the “DETECTORS 1-2’ terminals (6) this is a 4 wire connection (0V +VE MA MB). Each detector has a rotary
address selector switch (0-F) set to address 1 or 2.
Once connected and addressed you are required to learn the sensors to the panel by pressing the ‘LEARN DETS’ (10) button
Each sensor unit has an LED which shows green when power is applied.
Note: There is a warm up period after initial power up of approximately 90 seconds. During this time the green LED will flash once
per second and the output signal will be inhibited. This is to prevent spurious alarms. After the warm up period and on application
of gas the red LED will light when a high gas alarm level is reached.
Loss of communication from a learnt detector will cause the panel ‘Detector’ to flash yellow.
Additional sensor information can be found on page 6.
When first powered or after a loss of power press and hold the reset button for 2 seconds to start the system and
open the gas valve.
AGDS-2em v2
Detector LED’s
No Detector Off
Detector Powered Green (flashing during warm up)
Low Alarm Flashing red (every second)
High Alarm Flashing red (every 1/2 second)
High Alarm & Gas isolated Permanent Red
Sensor Alert Yellow
Panel Buttons:
Emergency Stop
Mute button for the internal toner
Reset button Press and hold reset button (2’s) when power is
first applied to enable gas.
LED indications:
Power On Green
Gas On Red
Em Stop Yellow
Fire Alarm Yellow

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Main features
Connections to panel: marked on board
1. Live & Neutral 230 volts supply from 3amp switched fuse spur
2. 230 volts out to gas solenoid valve (5amp relay)
3. Earth connection terminals
4. BMS relay set using 12 (potential free contact mains rated max load 5amp)
5. 24volt nominal supply
6. Detectors Power and Comm’s connections for detectors Methane LPG CO & Oxy.
7. FAP - Fire alarm panel input connection (requires a N/C circuit).
8. Remote emergency stop buttons SELV multiple buttons connect in series (requires a N/C circuit)
9. Detector high alarm “Time To Isolate” adjustment (1-64).
10. Learn detectors
11. Disable audible alarm sounder
12. BMS Relay - Can be set to report one of the status's in the table below. Max switching 230 volts 5amp’s
AGDS-2em v2
Power at 230 volts from a
2 1 3 4 6 5
12
9
8 7
11
10
1 2 3 4
EM Stop - ES OFF OFF ON OFF
Fire Panel Active -FA ON OFF ON OFF
High Alarm (Any State) - HA OFF ON ON OFF
Low Alarm (Any State) - LA ON ON ON OFF
Gas On State OFF OFF OFF ON
Detector Fault ON OFF OFF ON
Generic Fault (ES FA LA HA) OFF ON OFF ON

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2 1 3 4 6 5
12
9
8 7
11
10
Basic Connections
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)
For BMS or sounder/beacon
activation
Wiring information
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.
AGDS-2em v2
Medem Gas detectors
4 Core wiring
Multiple connect in
parallel

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Remote stop buttons
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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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 two detectors.
The detector types are:
• Carbon Monoxide.
• Combustible gases (Methane Propane).
• CO2
• Oxy
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.
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.) which must be ground at one end.
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
Detector Information
VE supply & Comm’s
From the main panel .
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 1-2 and then “learnt” using
button (10 see page 4)
Connection and addressing
Status LED
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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 slightly lighter than air and defuses evenly so detectors should be mounted within the breathing zone
approximately 1.6m 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. Check each detector has a different ID address 1-2
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.
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.
Please note using incorrect calibration gas or testing techniques can reduce the lifetime of the sensor and in some cases cause
the sensor to become blind.
Detector Location information
Detector Indications
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Warranty
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 is carried out in the order given
below to ensure the correct operation of the system.
Checklist
Please do not hesitate to call for advice on the
following numbers:
0161 233 0600 office hours
Or out of hours call:
07843 355163 UK only
Notes.
It is recommended that all systems are commissioned after installation by Medem UK. This will extend the warranty period from 5
years to 10 years on the main panel and ensure the system is working as designed.
Please see warranty conditions that came with the main panel.
The panel and any installed detectors should be tested every 12 months as a minimum with consideration to 6 months dependent
on environment.
Medem offer cost effective yearly service plan options which include detector exchange to assist in service budgeting.
AGDS-2em v2
First read the system description sheet before following the
instructions below
1. Connect the gas valve to the marked terminals “VALVE & EARTH”.
2. Connect any additional EM stop buttons or thermal links in series to the terminals marked “EM STOP” (8)
3. Each detector has a rotary address switch each switch should be set to a different number 1-2. Then connect the
gas detectors to terminals marked “DETETORS” (6) on the panel. Detectors are wired in parallel. “Daisy chain”
4. Connect the fire alarm input to the terminals marked “FAP”. Ensure volt free n/c (7)
5. Ensure any BMS connections are made to the ‘BMS1 Relay’ (4 ) and preferred output operation is set (12)
6. Connect the 3 amp fused spur 240 volt supply to marked terminals.
7. Once power is connected to the panel a correctly addressed and wired detector will flash a green LED for 90
seconds after which the LED will be continuously green.
8. Press the “learn dets” button (10) 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. A learnt
detector will be shown by a green ‘Detectors 1 2’ LED on the panel (it will also be flashing during the 90 second
warm up) if this is not illuminated check wiring check detector ID address and relearn.
9. At this point press the “Reset” button the panel will open the gas valve and the red ‘Gas On’ LED will be
illuminated .