Medem SEC-K Manuale utente

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SEC-K

Multi-Function

Control

System

for Kitchens

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

Multi-Function Control

System For Kitchens

The SEC-K is a ventilation interlock system combined with gas pressure proving that allows individual

control of the gas supply and work top electrics, it ensures that all fans are running before allowing gas

available for use

Each services can be individually controlled using the tactile buttons on the panel with overall secure

isolation provided by the main on/off switch.

Gas detectors for carbon dioxide and temperature enables demand based ventilation control and

monitoring of CO2 levels with added functionality of secondary interlocking. Natural gas, LPG and

Carbon Monoxide detectors can also be monitored.

Gas pressure proving for Natural & LPG gas with low and high pressure isolation.

An auto stop timer can be enabled to switch the services off automatically after a selectable number of

hours.

Industry leading 5 year warranty or 10 years when commissioned by Medem UK.

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

Design Features

Ventilation interlock of the kitchen fans by current monitoring or air flow, with fan status

displayed on the easy to use LCD.

Gas & electric isolation of a kitchen in one control panel, provides control for use and an

individual isolation point for an emergency.

CO2 monitoring enables demand based ventilation control and monitoring of CO2 levels

prescribed by the HSE and Technical Bulletin 140.

Additionally with the installation of CO2 detectors secondary Interlocking can be used. This

means with a correctly designed interlock system should there be a mechanical ventilation

failure a 24hr allowance is available to interlock on the CO2 level. Using the secondary

interlocking method it is imperative that the system is designed such that a interlock is not

initiated without the correct CO2 levels being monitored and should a 5000ppm level be

reached the gas must be isolated.

Protects people and property by testing for leaks and open appliances before allowing gas

available by using Medem patented true differential gas pressure measuring across the

solenoid valve. This eliminates nuisance tripping of the gas supply as can happen with

mechanical switches.

Extremely simple to use, LCD panel tells the operator its status and what to do, with

connections to a BMS and an internal an audible buzzer.

Continual dynamic monitoring of the inlet pressure ensures a low pressure of 12mbar or

less causes an isolation of the gas solenoid valve to prevent the risk of Bunsen burners

extinguishing.

An Over pressure of 70mbar. or above would also cause an isolation, this is to protect

operators or equipment from a over specked high gas pressure.

Quick proving time, typically 50 seconds from switch on to ready for use.

In the event of a fire alarm test being undertaken the system can be set into a fire test

isolation mode, once the test is completed the panel will revert to normal operation and

be included in a fire alarm activation.

As a guidance, an engineer, can see classroom & valve seat gas leakage on the LCD.

Emergency shut off button, more can be added all low voltage.

Gas detection of Natural gas, Carbon Dioxide, Carbon monoxide, Oxygen and L.P.G

Auto stop timer no complicated timer resetting, protects building out of hours.

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

The SEC-K is designed to protect people and property by means of testing for leaking

gas each time the system is switched on. Whether gas is escaping from an open

appliance that has been left on the system will not open the gas solenoid valve until the

gas line is gas tight. This system also isolates the electric and water bench sockets and

taps.

The LCD screen displays the current status of the system. The panel offers solutions and

advice instead of rows of flashing LED’s that can often be confusing to the end user. A

number of engineer functions are available within the panel in order to facilitate faster

installation and testing of equipment. Amongst others, a tightness test indication of the

gas line and a solenoid valve let by test can be carried out from the panel using the

function buttons on the circuit board. Gas pressure readings from both sides of the

valve can be displayed on the LCD unit .

Gas Pressure Proving

Using the patented differential pressure proving method the

SEC-K can test for low pressure (natural/LPG) gas pipe work or

can pressure prove a variety of gas delivery lines including

Oxygen up to 10bar. Overpressure can also be monitored and

reported on the LCD display.

Fan interlocking

To meet current regulations the system can interlock any mechanical ventilation so that

all fans are operating before gas can be used.

Demand controlled ventilation

Carbon Dioxide level and temperature monitoring to control area ventilation in a

laboratory. This enables energy and cost savings with the ventilation rate based on

occupancy and activities such as cooking or Bunsen burner use. Where the CO2 level

rises above prescribed limits the system can where required isolate a gas supply. The

limit is variable depending upon the application and prevailing legislation or guidance.

Gas Detection

The SEC has been designed to accept multiple Gas detectors, these include: Carbon

Dioxide, natural & LPG gases, Carbon Monoxide, Oxygen depletion & enrichment.

Isolation of gas will occur upon detection of the target gases at prescribed levels.

All features are installed as standard which can either be utilised at the point of

installation or at a later date should requirements or legislation change.

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

Technical data sheet

The SEC-K system comprises of a pressure sender unit and a 230volt gas solenoid valve.

The panel housing is an ABS enclosure, rated IP65, measuring 183mm high, 212mm wide & 97mm deep.

The pressure sender unit and the gas solenoid valve are supplied with a fixing kit for connection on site.

The pressure sender unit is wired to the control panel using single pair low voltage wire.

The connection terminals are marked “A & B” on both the sender unit and control panel connections.

The 230volt mains supply to the panel should be from a 3amp fused switch.

The solenoid valve is connected to the terminals marked “Valve” on the panel connections.

The connections marked “EM STOP” are provided in order that extra emergency stops can be operated by the

panel. Wiring of emergency stop buttons should be series normally closed, extra low voltage.

The connections marked “CM2 or PD switches are for the connection of a current monitor or pressure

switches for interlocking fans with the gas supply.

The connections marked “detectors” are for the connection of up to 16 devices including, Methane, LPG, Co2,

CO, Oxygen and temperature. Mixed devices can be connected.

At the time of installation adjustments to the system can be made to suit the individual site, these include:

Auto stop timer, alarm sounder on/off, fill time and prove time for pressure proving to find the smallest leak.

All are factory set for a typical installation.

For guidance purposes only, a let by and a tightness test can be activated by the engineer using the push

buttons on the circuit board. This is a diagnostic indicator. The Gas pressure readouts appear on the LCD

display indicating the pressure on both sides of the valve.

System On/Off enables gas detection and use

of each service button

A B

ABlind button for displaying gas pressures on the LCD screen

BBlind button for displaying first 8 detectors (Gas & temperature) on the LCD screen.

Press A& Btogether to display second set of 8 detectors.

(

Press button B3 times in quick succession to enable fire test mode see page 4)

Medem (UK) Limited

L&M Business Park , Norman Road

Altrincham, Cheshire,

Tel: +44 (0) 161 233 0600

Fax:+44 (0) 161 233 0601

Website: www.medem.co.uk

Cert No. 10213

SEC-K

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

3. To contactor for isolating bench socket electricity supply

4. 230 volts out to water supply isolation valve

5. Earth connection terminals

6. Remote emergency stop buttons SELV, connect in series multiple buttons (requires a N/C circuit)

7. Extract fan interlock for current monitor (CM2M-K) or PD switches.

8. Supply fan interlock for current monitor (CM2M-K) or PD switches.

9. 12 volt power for current monitor (CM2M-K)

10. Pressure sender unit SELV and comm’s both through “A” & “B” terminals (2 wire) MUST BE FITTED

11. Power connections for detectors, Methane, LPG, CO, CO2, Oxygen, Temperature

12. Comms connections for detectors, Methane, LPG, CO, CO2, Oxygen, Temperature

13. Fire alarm input signal (N/C contact required).

14. 0-10 volt output to fan speed controllers based on CO2 and temperature levels

15. Two relays, for connection to a BMS to indicate, high alarm, gas on, EM stop, low alarm. (One selectable for each relay)

16. OPTA=Over pressure check, will isolate gas supply if pressure exceeds 70 mbar

17. Fill & prove time for gas pressure proving, see page 4.

18. Timer adjustment for fan commissioning, allows timed period for gas installation commissioning.

19. Auto stop timer to isolate gas after set length of time. Factory set for model & use

20. CO2 alarm level adjustment depending on application. Factory set for model & use

21. High pressure low cut out adjustment (

where high pressure sender unit is used 1 bar>

)

22. Fan comm button, enables commissioning of the gas supply without fans running.

23. Learn field device button, press once only when all detectors are connected and powered (verify with Blind button B).

24. Jumper link to disable audible alarm sounder.

25. Lift valve button, opens the gas valve only whilst the button is continuously pressed, for commissioning purposes.

Power at 230

volts from a

3amp fused spur

Electrical contactor

SEC-K

Method 1 (

Preferred

)

Using this wiring method, when isolating the supply there are no other voltages present within the panel.

N L

To Contactor Coil

Method 2

IMPORTANT! If wired this way, a warning notice must be attached to the panel to indicate that there

are two separate mains feeds.

L N

Supply in

Contactor coil

Live feed through switched relay

to operate contactor

To bench

sockets

L N

Supply in

Earth Connections not shown

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

Electrical Contactor

Gas Solenoid

230v

3 amp fused spur

230v

EM Stop Buttons,

TT-70c

Series connected

Addressable

Gas detector

Addressable

Gas detector

6 core low voltage

cable

Sender unit

Mounts on the gas valve

Requires a

volt free NC

contact

0-10v output for

connecting to a fan

speed controller

fans

Medem CM2

2 channel current

Monitor

6 core low voltage

1 x + - 12v

fans

Fan speed

controls Fan Supply

230v

230 v

Earth Connections not shown

Where using 3 phase fans

interlock on a single phase

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

Website: www.medem.co.uk

e-mail:[email protected]

Cert No. 10213

SEC-K

"We design it, We build it, We back it up"

The Medem main panels come with an industry leading 5 year parts warranty

as standard and when commissioned by a Medem engineer this can be

increased to 10 years and includes a 24hr helpline.

During the commissioning process a Medem engineer would attend site to

ensure full and correct operation of the supplied Medem equipment, all site

information including gas pressures, amperages and photographs would be

taken and then uploaded to our service database.

This information is then instantly available for precise service back up and

support via our 24hr telephone helpline. The 24hr helpline is manned by Medem

personnel only.

Warranty & Commissioning

Medem (UK) Limited

Project House, 19 Dallimore Road,

Roundthorn Industrial Estate,

Manchester, M 3 9NX

Tel: +44 (0) 161 33 0600

Fax:+44 (0) 161 33 0601

www.medem.co.uk

e-mail:sales@medem.co.uk

Cert No. 10 13

SEC-K 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 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 s stem.

Do not switch the ventilation et; turn on the SEC-K 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 suppl to the Kitchen; turn the SEC-K 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.

Re-establish the gas suppl and switch on an ventilation; open a gas appliance so that a demand

is being made on the gas suppl : turn on the SEC-K and press the gas button:

The system will begin a pressure test and indicate an alarm state, a message relating to “check all

appliances” will be displayed and the gas will remain isolated.

Continued..

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