Medem SafeAir User manual

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SafeAir
Installation Instructions
The SafeAir is a ventilation interlock system with gas detection.
The system will ens re that any mechanical ventilation connected (s pply and/or extract) is r nning before
the gas can be sed, when installed with gas sensors it will also monitor the atmosphere for CO and/or CO2.
It will then contin ally monitor for fan operation.
Before commencing installation please familiarise yo rself to the eq ipment by reading the comprehensive
installation instr ctions. If in do bt then please call 0161 233 0600. O t of ho rs 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 m st be iss ed to the end ser along with instr ctions for the operation of the
eq ipment.
As the Man fact rer Medem UK sho ld commission this safety system where pon a commissioning report
will be forwarded to the installing agent who sho ld provide a copy to the end ser.
At the point of o r commissioning an individ al serial n mber will be attached to the system along with a 24
help line n mber. 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 ho r help line. The warranty period for the
panel and sender nit will then be extended to Ten years.
• Ventilation interlock.
• Gas Detection .( p to 4 detectors )
• 5 year warranty - 10 years when commissioned
SafeAir features

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System description
SafeAir
System On/Off
Ventilation interlocking and gas detection
The SafeAir is a Ventilation Interlock system. The system will ens re that any mechanical ventilation connected (s pply or
extract) is r nning before the gas can be sed, when installed with gas sensors it will also monitor the atmosphere for CO and/or
CO2. It will then contin ally monitor for fan operation.
The system comprises of a mains powered panel capable of operating p to fo r sensors. The sensors are pre-calibrated by
Medem (UK) Ltd s ch that they only req ire to be addressed then connected to the panel and f nctionally tested. The ventilation
is interlocked via a MEDEM c rrent monitor model CM2M-K (separate) or mechanical air flow switches.
Control Panel
The front of the panel has the following controls and indications:
Emergency stop b tton.
System On/Off switch.
LCD display:
For displaying system stat s d ring both installation and normal se, also for displaying diagnostics

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Main feat res
SafeAir
Connections to panel: marked on board.
1. Live & Ne tral 230 volts s pply from 3amp switched f se sp r
2. 230 volts o t to gas solenoid valve
3. Earth connection terminals
4. BMS to indicate, high alarm, gas on, EM stop, low alarm. (Using No13 AX1 & 2 )
00 = Gas On
10 = Fan Fa lt
01 = EM Stop & High Alarm
11 = Un sed
5. Remote emergency stop b ttons SELV, connect in series m ltiple b ttons (req ires a N/C circ it)
6. Power connections for detectors, Methane, LPG, CO, CO2, Oxygen, Temperat re
7. Comms connections for detectors, Methane, LPG, CO, CO2, Oxygen, Temperat re
8. 12 volt power for c rrent monitor (CM2M-K)
9. Fan A interlock for c rrent monitor (CM2M-K) or PD switches.
10.Fan B interlock for c rrent monitor (CM2M-K) or PD switches.
11. Switch to disable a dible alarm so nder.
12. Header socket for front panel key switch.
13. Fill & prove time for gas press re proving & AUX relay settings (see No4).
14. Header socket for front panel Emergency stop b tton.
15. Fan comm b tton, enables commissioning of the gas s pply witho t fans r nning.
16. Learn detectors b tton, press once only when all detectors are connected and powered
17. View detectors
18. Display gas press res on the LCD screen
19. Lift valve b tton, opens the gas valve only whilst the b tton is contin o sly pressed, for commissioning p rposes.
1 2
12 11
16
17
13
14
3 4 5 6 7 9 10
1
19
15

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Gas Detection
Gas Detectors
IMPORTANT - Gas Detectors sho ld not be installed ntil all b ilding, constr ction or painting work etc.. Is completed, as these
works can effect the sensitivity and longevity of the detectors.
Ens re that the protective cover labels (RED) are removed only
after the completion of all b ilding work and the system has
been commissioned by the Medem engineer.
The labels are req ired to be removed for the detectors to
operate, b t removal before the completion of works risks
contaminating the sensor element.
The system is capable of operating a mix of p to 4 detectors of different types.
The detector types are:
• Carbon Dioxide.
• Carbon Monoxide.
• Comb stible gases (Methane, Propane).
Detector location will vary dependant on the individ al characteristics of the target gas that is being monitored for. See the gas
detectors own instr ctions for more g idance.
Detector Information
+VE s pply & 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 m st be set to its own
address and then “learnt” sing b tton
16 (see page 3)
Connection and addressing
Stat s LED
SafeAir
All c rrent wiring reg lations m st be followed with reference to r nning low and mains voltage cables together.
The maxim m cable length between a detector and the control panel sho ld not exceed 100 metres, if the distance between
the main panel and the detectors is greater than 20metres a 1mm screened cable m st be sed on the +VE, 0v terminals
Gas detectors, req ire a fo r core screened Belden type sec rity cable or 600v rated BMS cable (max cable length of
100meters.)
Remote emergency stops, req ire a two core screened cable.
Warranty will be void if Fire Protection Cable or cable over 1mm dia. is sed on the SELV side.

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Detector Information
Detector location will vary dependant on the individ al 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 f nction care m st be taken not to site a detector in a “dead space” or in the flow of any ventilation.
Natural Gas/Methane
Nat ral gas detectors sho ld be mo nted at high level on a wall approximately 150mm from the ceiling height and avoiding
corners and potential dead air areas.
Nat ral gas detectors sho ld not be mo nted below the height of the top of a doorway for example. This is beca se as the gas
is slightly lighter than air it will rise filling the room from the ceiling down and will spill thro gh the top of a door opening into the
next room. If the detectors are mo nted 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 mo nted at low level 100mm from the floor, consideration sho ld be given
to any potential mopping or wet floor height.
Carbon Monoxide
Carbon Monoxide is similarly weighted to air so detectors sho ld be mo nted between 1 to 2 meters from the floor.
Carbon Dioxide
Carbon Dioxide detectors sho ld be installed so they monitor the general level of CO2 within the area. They sho ld be mo nted
above standing head height and between 1m and 3m from the potential so rce. Care sho ld be taken so they are not located
close to the edge of a canopy or in direct flow of the s pply or extract ventilation.
For additional information or g idance on site specific req irements please don’t hesitate to contact s.
Each detector has its own Bi-Colo r LED which is sed to indicate the stat s of that detector.
Not Lit: No power/comm’s. These a fo r wire nits and all connections are req ired, check the polarity of both the
power and the comm’s (MA/MB) terminals are correct.
Flashing Green: Detector is warming p, the detectors will flash green on power p 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 req ire correctly addressing ( sing the address
selector pot) and learning by the system sing b tton 16 (see page 3).
Flashing Red: Low level alarm. All detectors have both a low and high level alarm, low level alarms serve as a warning
that an nsafe condition maybe b ilding and gives chance to intervene before loss of gas service.
Solid Red High level alarm. An nsafe level of the target gas have been reached and the system will isolate the
gas s pply. The ca se of the alarm will req ire identifying and resolving before the gas s pply can be re-
established.
After installation a simple b mp test can be performed by sing an appropriate level test gas in order to check operation. F ll
testing and calibration checking takes place d ring a Medem commissioning.
Detector Location
Detector Indications
SafeAir

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230v S pply
3Amp F sed Sp r
Basic Connections
EM Stop B ttons,
Thermal links
(Normally closed)
For m ltiple, connect in
series.
Gas Solenoid
Medem
Gas detectors
M ltiple,
connect in
parrallel
Live feed thro gh the
Medem CM2M-K2 channel
c rrent Monitor
fans Fan speed
controls Fan live
S pply
Where sing 3 phase fans
interlock on a single phase
See page nine
Earth Connections not shown
6 core low voltage
+/- 12v Power
S1 = S pply Fan N/C contact
E1 = Extract Fan N/C contact
Fan Interlock Connections
SafeAir

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Remote stop b ttons
To EM Stop connections in the
panel
Use terminals TB2 A & C Use terminals TB2 A & C
Remote stop b ttons can be connected to the panel terminal
marked as “EM STOP” (n mber 6 ).
The remote b ttons m st 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 b ttons s pplied by Medem are of a “P sh Glass, key resettable” style, when activated a yellow indicator bar will
show and the nit will req ire resetting sing the key provided.
M ltiple stop b ttons are wired in series.
If thermal links are to be installed these too sho ld
be wired in series with the EM stop b ttons
Use terminal TB2 A & C
SafeAir

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Warranty
Medem (UK) Limited
Project Ho se
19 Dallimore Road
Manchester
M23 9NX
Tel: [phone]
Fax: [phone]
Web: www.medem.co. k
E-mail: [e-mail]. k
Medem UK Warranty
Terms & Conditions
1. The warranty is a parts warranty and Medem UK Ltd will not cover or accept any labo r or
other expenses that may be inc rred in the process of changing fa lty prod ct.
2. All panels and sender nits are covered by a five year warranty.
3. Gas detector nits and other remote detectors carry a two year warranty. Installation of the
detectors sho ld not be ndertaken ntil all b ilding and constr ction work is completed.
4. Gas solenoid valves carry the original man fact rers warranty, tho gh as the s pplier
Medem UK will exchange fa lty valves for ret rn to the man fact rer.
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 nit. At the time of commissioning a sec rity label with a serial
n mber 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
m st be provided to Medem UK A cost for labo r and travel to site will be prepared as a
q ote. The cost m st be incl ded in the order.
7. Where it is fo nd that the installation and/or the q ality of workmanship has contrib ted to
or wholly ca sed the fail re of the prod ct then we reserve the right to charge the whole or
a proportion of the cost of the fa lty item.
SafeAir

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messages
Detector fault, DXX lost comms
The system believes it has lost connection to a detector on address XX, verify detector addresses and press the “learn
b tton” (16). Verify all connected detectors are being registered by pressing “blind b tton B” (see page 2). If yo have no
detectors connected to the system pressing the learn b tton will clear the error message.
Gas Off, Switch On Fan X.
The system can monitor the fan stat s via a c rrent monitor or air press re switches. These provide a closed contact to
terminals Fan A and Fan B, it is a req irement when sing fan interlocking that the fans be r nning (and therefore the A and B1
receiving a closed contact) before the system can begin a gas press re test. If at any point the fans stop r nning (opening the A
or B contact) the system will isolate the gas and report fans not r nning. Check that the fans are not only switched on, b t
act ally r nning and moving air.
Gas Off, Reset Em Stops & Switch On/Off
The system has an panel mo nted emergency stop and connection inside for remote b ttons. First check the panel b tton (once
pressed some req ire resetting by twisting and releasing). Clear the message by t rning the main system switch off and then
back on, if the message remains check any remote b ttons and their connections. The terminal for the remote b ttons req ires
a volt free normally closed contact, ens re all remote stop b ttons, thermal links any another connected systems (BMS/Fire
panels) are reset and the contacts are closed.
In the event of any alert the system will always give a reason on screen as to the ca se.
Common messages yo may receive are shown below with f rther explanation.
If yo req ire any help or if anything is nclear then please contact technical s pport on 0161 233 0600
SafeAir