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1. senes sana anat 57 9 lt eec 64 9 1 sue AAO E AA NS S 64 9 2 BEITI E EAS E FEE S EAE SEE E AES ETENE E EE N 65 9 3 DISPLAY ADJ STMENT a saa asqa ie va EE ce pu eve e N 66 9 4 ALARM e aa NA 67 9 4 1 asw ato EEEE Lato n EA T A de oi 67 9 4 2 Pe ISTITUTI yalayan E E E ET SET 68 9 5 ALARM a Mahe umu 69 10 CHANGES AN OPERATING PLAN TT 70 Siemens Building Technologies 4 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 104 e t t e Oe Ai 70 10 2 56 72 1073 mu Na 73 19 4 ADD PERIPHERAL eter e 74 10 5 RESET t n a Pe a rte e Ueda idea us h asa padus a 77 11 TECHNICAL DATA cec cu ku ccn exp an cec
2. DR ER CORPER 79 14 14 mau n uu TT PT m Ps bu m Q 79 Internal SUMPOrTUNGHON 3s u ict eo ata eee etre e DUI rente ta eme sasa pay i ape alee 81 11 25 PERIPHERAES 5 NE pier o ore aS USUSI niae o SSS as 82 11 2 Sensors inii eene ner rame cH HU 82 1122 Relay Mod le EZY40 e ol um im v ene D cited rt tani 85 11 2 3 gt Display Module LZD40 rta re afi pta edet fee ta eder tate a fo ard dean 86 12 E M 87 121 CENTRALUNITEY G40 ee T eet ci eee ee ie ee 87 122 RELAYMODUL ELZ 40 L EE 88 12 3 DISPLAY MODULE LZD40 a 88 pon EST INTO AE E IU MERERI uM 89 12 5 SENSORS QA IM ME 89 13 ELECTRICAL DIAGRAM M 91 SIEMENS WARNING The installation of a gas leak detection system for methane or liquid petroleum gas LPG does not exempt from the compliance to the safety rules and to all the laws in force concerning the installation and use of gas equipment for ventilation of the rooms and for the discharge of flue gases The installation the periodic inspections or the substitution of the devices must be done by qualified technicians 1 GENERAL INFORMATION Before describing
3. XH hooter 2W BOILER Solenoid valve 12W Wiring between Central Unit and peripherals should be made as shown in figures 4 1 and 4 3 power and communications cable should be connected as indicated in terminal box figures Siemens Building Technologies 32 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS With reference to table 4 1 the next example shows the total power calculation CONSUMPTION Qty UNIT POWER TOTAL POWER TOTAL CURRENT Sensor QAG40SS 3 1 6W 4 8W 0 4 Sensor QAO40SS 1 0 7W 0 7W 0 058 Relay Module LZY40 1 2 5W 2 5W 0 208 Solenoid valve 1 12W 12W 1 Hooter 1 2W 2W 0 166 Signal lamp 1 2W 2W 0 166 Buffer Battery 1 7W 7W 0 583 TOTAL 31W 2 581 Table 4 3 Power cable cross section will be Sz 2 581 3 0 860 since the calculated value is lower than 2 5mm we choose 2 5mm leads anyway 4 4 2 Extended structure When the loads exceed the maximum Central Unit power 30W fit an UPS The following example shows a plant with three boilers each provided with a gas solenoid valve Near each boiler there is a methane detector QAG40 one carbon monoxide detector 40 is sufficient for the whole room One Display Module is installed at room entrance for status plant control without using the Central Unit Each methane detector is associated with a Relay Module that in case of pre alarm feeds an acoustic signal in case of first al
4. The ALARM MODE is reached from main page pressing key v until MENU CONFIGURATION is displayed Acting as follows MAIN MENU ER MENU CONFIGURATION MENU CONFIGURATION NEW INSTALLATION DIAGNOSTIC SYSTEM NEW CENTRAL UNIT DISPLAY SETTINGS Y DELETE PERIPHERAL Fig 9 11 Fig 9 12 User Manual 40 Rev 06 67 Siemens Building Technologies September 2001 HVAC Products SIEMENS Press to move the cursor to ALARM MODE ALARM MEMORY ALARM MODE gt MENU CONFIGURATION 4 4 Ap ay MANUAL RESET Fig 9 13 Fig 9 14 9 4 2 Automatic reset Enter programming mode to change YES with NO ALARM MODE ALARM MODE MANUAL RESET MANUAL RESET Fig 9 15 press the two keys Fig 9 16 simultaneously for 5s Programming cursor until you hear a beep 68 User Manual LYC40 Rev 06 Siemens Building Technologies September 2001 HVAC Products STEMENS ALARM MODE ALARM MODE MANUAL RESET MANUAL RESET Fig 9 17 Fig 9 18 ESC Key sets NO Press to confirm automatic alarm reset In this case the achieved alarm status keeps until its cause is removed 9 5 ALARM RESET It has the aim of recognizing activated alarms and restore normal operation see previous paragraph ALARM RESET is effective only if manual alarm reset has been selected From main page press until you see ALARM RESET MAIN MENU ALARM RESET ALARM RESET PRESS
5. 3 TERMINALS 12VDC 0 6VA 0 500 ppm Products SIEMENS Gasoline vapours sensor 40 only on request Methane and LPG sensors have these default threshold values Pa 10 LEL 1T 20 LEL 2T 40 LEL They can be changed for each sensor by the operator from the Central Unit within these values e 0 4 1 from zero to the value set for 1T 1T Pa 2T from Pa value to 2T value e 2T 1T 50 LEL from 1T value to al 50 LEL Measurement range 0 51 2 LEL Accuracy 1 LEL CO sensors have these default threshold values e Pa 30ppm 1T 100ppm 2T 200ppm They can be changed by the operator from the Central Unit within these values 0 41 from zero to 1T value 1T Pa 2T from Pa to 2T value 2T 1T 500ppm from 1T to 500ppm e NOTE for sensors operating checking refer to relevant chapter on page 51 Siemens Building Technologies 84 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 11 2 2 Relay Module LZY40 The Relay Module is the plant actuator When one assigned sensor detects gas presence the LZY40 activates the corresponding internal relay provided with a voltage free changeover contact 250VAC 5A 1 K2 Pa pre alarm 2 1 first alarm threshold 3 4 2 second alarm threshold 4 Kt fault FA The relay operation logic can be selected from the Central Unit positive or negative There are 5 front
6. NEW INSTALLATION INSTALLATION NEW CENTRAL UNIT LOGIC DELETE PERIPHERAL ALARM MODE Fig 10 33 Fig 10 34 Press key to enter RESET INSTALLATION When entering this page you hear a beep RESET INSTALLATION MENU CONFIGURATION DELETE ALL MY Cts Cla NEW INSTALLATION PRESS 14 9 NEW CENTRAL UNIT SIMULTANEOUSLY 9580 DELETE PERIPHERAL Fig 10 35 Fig 10 36 Siemens Building Technologies 78 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS RESET operation can last some minutes while the Central Unit shows this message WAIT PLEASE Fig 10 37 11 TECHNICAL DATA 11 1 Central Unit The Central Unit is enclosed in a plastic case for panel mounting with transparent display and keyboard cover Main features 1 Power supply battery charger e Input 230VAC 10 15 50 60Hz e input 12VDC from external UPS to be used as an alternative to 230VAC power consumption 6 output to peripherals 12VDC 2 5A e output to buffer battery 13 8VDC 2 Control and communications electronics 3 Selectable alarm reset manual default or automatic 4 Selectable relays operation logic positive default or negative 5 Automatic check of sensor operating time with lifetime display User Manual 40 Rev 06 79 September 2001 Siemens Building Technologies HVAC Products SIEMENS BUS output for communications with peripherals max 99 RS232 or RS485 outp
7. 05 Fig 9 6 Fig 9 7 User Manual LYC40 Rev 06 65 Siemens Building Technologies September 2001 HVAC Products SIEMENS 9 3 Display adjustment It is possible to change display contrast and back light from the following page accessible pressing key v from the main page MAIN MENU DISPLAY SETTINGS ALARM RESET Fig 9 9 DISPLAY SETTINGS CONTRAST 5 BACKLIGHT 5 Fig 9 10 DISPLAY SETTINGS t E CONTRAST 5 BACKLIGHT 5 Fig 9 10 DISPLAY SETTINGS CONTRAST gt 5 BACKLIGHT 5 press the two keys simultaneously for 5sec until Fig 9 10 you hear a beep Using keys and you increase decrease the number right of the cursor while key A moves the cursor to the desired line Once achieved optimum contrast values press ESC to confirm and exit the page Siemens Building Technologies HVAC Products 66 User Manual LYC40 Rev 06 September 2001 STEMENS 9 4 Alarm mode The LYC40 allows to alarm reset modes 1 manual 2 automatic The factory default is manual reset 9 41 Manual reset In this mode any time an alarm is generated it is stored and keeps active until the operator does not deactivate it manually see ALARM RESET chapter 9 5 WARNING In manual reset mode if an alarm activates a hooter this will continue sounding until the operator stops it Consequently in an unattended plant a long lasting alarm can cause police or firemen intervention
8. RM deactivated Pressing key again causes a temporary fault FA for the physical identification of the Relay Module status red LED steady on Pressing key further show again the sequence AC D FA gt gt to shift the cursor right on the pre alarm Pa column RM ST Pa 1T 2T FA A YA t 4 ap RM ST Pa 1T 2T FA Of 22 55 01 gt press key to activate Fig 8 26 prealarm relay a XX appears Fig 8 27 The relay associated with the pre alarm is activated its contact closes and in the following example showing a basic structure a signal lamp turns on Pressing key the XX disappear and is replaced by while the pre alarm relay reverts to rest position Siemens Building Technologies 62 User Manual LYC40 Rev 06 HVAC Products September 2001 SIEMENS RM ST Pa 1T 2T FA RM ST Pa 1T 2T FA 01 AC XX 01 Fig 8 28 Fig 8 29 Now move the cursor right pressing key up to relay 1T RM ST Pa 1T 2T FA RM ST Pa 1T 2T FA o5 o0 oa s E Fig 8 30 Fig 8 31 Acting as described above activate and deactivate relays 1T 2T and FA and check that connected devices are correctly driven ESC Once tests are finished press key until the main page is displayed any relays left activated during tests will be deactivated anyway when exiting the page E Please remember that exiting the page using k
9. HVAC Products September 2001 STEMENS In an underground parking the intervention of the devices air extractors valves fans must happen only if more than one gas detector are in alarm state for gas or gasoline vapours presence This to avoid that local and not dangerous events a car that starts its engine near to a gas detector cause the inopportune intervention of these devices Electrical diagrams in previous pages are only an example of applications User Manual LYC40 Rev 06 95 Siemens Building Technologies September 2001 HVAC Products SIEMENS NOTE STEMENS SIEMENS Siemens Building Technologies SpA HVAC Products Via Caldera 21 D 1 20153 Milano Tel 39 02 2431 1 Fax 39 02 243 65750
10. Siemens Building Technologies September 2001 HVAC Products SIEMENS 4 3 8 Display Module terminal box The Display Module terminal box is shown in figures 4 9 and 4 10 BUS 12V T x ode BUS shield BUS input Input 12VDC power supply Fig 4 10 Terminal box Siemens Building Technologies 30 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 4 3 4 Relay Module terminal box The Relay Module terminal box is shown in figures 4 11 and 4 12 2T Relay 1T Relay PrRelay Relay i BUS shield BUS input Fig 4 12 Input 12VDC power supply Relay Module terminal boxes Note The module FA relay energizes only in case of electrical fault of the same module and not if an associated sensor fails User Manual 40 Rev 06 31 Siemens Building Technologies September 2001 HVAC Products SIEMENS 4 4 Plant structure Central Unit LYC40 can supply external loads up to power 30W 1W Over this limit an external UPS is required In the first case we have a basic structure in the second case we have an extended structure 4 4 1 Basic structure Fig 4 13 shows a possible application for a basic structure equipped with three methane sensors one carbon monoxide sensor one Relay Module one alarm hooter one solenoid valve for gas cut off and one signal lamp a Battery 7W Power supply
11. 3 For sensor positioning follow these general rules 1 at 20cm from the floor for gases heavier than air LPG 2 at 20cm from the ceiling for gases lighter than air Methane 3 medium height 1 5 2m for gases as heavy as air carbon monoxide CO The sensor can be only installed on a wall using some plugs and screws Sensor orientation is always downwards 14 User Manual LYC40 Rev 06 Siemens Building Technologies September 2001 HVAC Products STEMENS Wall mounting slots Fig 3 4 For cable entrance in EExdlIC sensors use an explosion proof cable stretcher Using other cable stretchers would declass the installation degree To assure a correct plant operation sensor positioning is to be made considering the following installation rules besides the general rules listed above The sensor is to be mounted close to possible gas leak points at least at 1 5 m from heat sources never in bad ventilated areas where gas pockets may take place at least at 1 5 m from vent openings far from any hindrance to natural gas flow in rooms where air temperature is within 0 and 509 and relative humidity is less than 90 non condensing o Orb The number of sensors to be installed in order to obtain a correct coverage of a room is proportional to its surface area and its height Given the many variables affecting this parameter see installation rules the following graph should be considered as a simpl
12. 5 SEC SIMULTANEOUSLY Fig 9 19 Fig 9 20 User Manual LYC40 Rev 06 69 Siemens Building Technologies September 2001 HVAC Products SIEMENS ALARM RESET ALARM RESET EXECUTED for 5 sec Fig 9 21 NOTE The ALARM RESET is effective only when the alarm cause is terminated otherwise i e gas is still present the Central Unit will signal alarm conditions again 10 CHANGES ON AN OPERATING PLANT This chapter deals with any changes to be made to an already operating plant There are special commands to add or replace peripherals sensors or Relay Display Module and to replace the Central Unit From MAIN MENU go to MENU CONFIGURATION 10 1 New Central Unit This operation is needed when it is necessary to replace the Central Unit with a new one This command allows to keep all the plant configuration and to automatically transfer them to the new Central Unit avoiding to reconfigure the whole plant Act as follows Turn the plant off disconnect the old Central Unit replace it with a new one and turn the system on again Siemens Building Technologies 70 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS From the Central Unit MENU CONFIGURATION use key wd reach NEW CENTRAL UNIT line then press key A NEW CENTRAL UNIT WAIT PLEASE an NEW CENTRAL UNIT TO CONFIRM PRESS gv SIMULTANEOUSLY Fig 10 1 Press until the beep Fig 10 2 I
13. 87 Siemens Building Technologies September 2001 HVAC Products SIEMENS 12 2 Relay Module LZY40 12 3 Display Module 17040 Siemens Building Technologies HVAC Products 88 User Manual LYC40 Rev 06 September 2001 STEMENS 12 4 Sensors 40 5 12 5 Sensors QA 40 E User Manual LYC40 Rev 06 September 2001 89 Siemens Building Technologies HVAC Products SIEMENS PLANT CONFIGURATION AND DEVICE NUMBERING SENSORS Number Type of detected gas Sensor location Number Type of detected gas Sensor location 1 6 2 7 3 8 4 9 5 10 RELAY MODULES Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors Pr Pr i 15 3 15 2 25 Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors Pr Pr 2 1s 4 1s 2s 2s FA FA DISPLAY MODULES Number Display Module location Associated Number Display Module location Associated sensors sensors 1 3 2 4 Siemens Building Technologies 90 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 13 ELECTRICAL DIAGRAM EXAMPLE OF INSTALLATION WITH 230 AC POWER SUPPLY AND 12 DC BAC UP BATTERY ELECTRICAL ELECTRICAL Jst THRESHOLD PREALARH End THRESHOLD l
14. T 5 22222 9 D aan asia ba yaa Sa Yala aa yaaa iay Sau 40 6 1 BUTTONJAND L E D RUNGTIONS ient Fu ed Do s mas 40 6 2 CONFIGURATION 42 6 3 46 6 4 CHECKING THE CORRECT OPERATION OF THE SENSORS ccecesesececececeeececececececececececececesececeseceseceseseseseseseseseseseseseseseseseseseseseseseseeesesesesess 49 6 5 ERROR MESSAGES chr verc inre oon rev ed a re EE 50 6 6 DISPLAY MODULE VISUALIZATION t Dun a Pappe 51 7 OPERATION Herc ctc PCE a 52 CENE WERE VU HRS 55 8 1 STATUS bert Me 55 8 2 ACTIVATED STATUS u u l vieta Pv cres e ORE o Fu Pet reve dere ERR EON EO ve Pa ruf E Pe ul vcr b o 55 8 3 DEACTIVATED STATUS ttes tci e eee Lv Pe Ur ert a eee o ue uy ev vr d v vu 56 8 4 eA E DM MONS MEUM ME UNA MU MUN EL MM IM MM ML ML e 56 8 5 DISPLAY AND CHANGE OF A PERIPHERAL PARAMETERS 1 1
15. Thane pate Sete E A 23 4 2 CABLESIZINGAND CONSUMPTION Y 26 4 3 TE RMINAEBOXRECOGNITIONIS 43 cn 3 m tet cem rent reto on e 28 4 3 1 Central Unit terminal boxes RAT tpe ree eei eb ve 28 4 3 2 28 4 3 3 30 4 3 4 Relay Module terminal DoX eed banka h A ab se e IER e Eae e a T ete Eoo de 31 4 4 PLANT STRUCTURE 32 4 4 1 REPE 32 4 4 2 List LTEM 33 5 4 E E RF D RR E X A C RD E ER ER OO RT HER DK E Fa 36 User Manual 40 Rev 06 3 Siemens Building Technologies September 2001 HVAC Products SIEMENS 5 1 OPERATION S th eti mete tae o di Nt tmd 36 5 2 TROUBLESHOOTING c MO Lets Tete threes uu a select 38 6 COMMISSIONING A NEW PEANT u u
16. and after checking they have been correctly carried out it is possible to supply the plant CAUTION PLANT SUPPLY IS TO BE MADE BY SKILLED AND CERTIFIED PERSONNEL AWARE OF THE RISKS INVOLVED IN ELECTRICAL SHOCK RISKS ANY OPERATION MUST BE MADE UNDER POWER OFF CONDITIONS 5 1 Operation First step is to supply power 230Vac 50Hz to the Central Unit in case of a basic structure or to the UPS in case of an extended structure This condition is expected 1 The Central Unit display shows WAIT PLEASE Fig 5 1 Siemens Building Technologies 36 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS In this phase the Central Unit checks all the peripherals and this can take also some minutes Warning all the sensors have their status red LED blinking fast the Relay Modules have three red LEDs and the yellow LED ON and the red status LED blinking fast the Display Modules have the display OFF and the red status LED internal blinking fast When the Central Unit finishes checking the plant its display shows MENU CONFIGURATION NEW INSTALLATION NEW CENTRAL UNIT DELETE PERIPHERAL Fig 5 2 In this phase the Central Unit recognizes the peripherals and presets them for configuration status LED blinking fast The Central Unit expects the operator goes on with configuration as indicated at par 6 2 After a 30 minute timeout timeout starting again at each button pressure the display looks like the
17. gt MENU CONFIGURATION gt LIST OF SENSORS DIAGNOSTIC SYSTEM EXPIRED SENS LIFE DISPLAY SETTINGS Fig 10 18 Fig 10 19 Siemens Building Technologies 74 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS MAIN MENU MENU CONFIGURATION MENU CONFIGURATION NEW INSTALLATION DIAGNOSTIC SYSTEM NEW CENTRAL UNIT DISPLAY SETTINGS DELETE PERIPHERAL Fig 10 20 Fig 10 21 MENU CONFIGURATION NEW INSTALLATION NEW CENTRAL UNIT DELETE PERIPHERAL MENU CONFIGURATION 4 ADD PERIPHERAL gt REPLACE PERIPHERAL RESET INSTALLATION Fig 10 22 Fig 10 23 Press key to access ADD PERIPHERAL ADD PERIPHERAL 1 ADD PERIPHERAL TO CONFIRM 504 01 DMO 2 PRESS ee hep ad PRESS PERIPH BUTTON SIMULTANEOUSLY 604 Fig 10 24 Fig 10 25 User Manual LYC40 Rev 06 75 Siemens Building Technologies September 2001 HVAC Products SIEMENS For example suppose the operator is adding a Display Module and that for this it presses the configuration button on the same peripheral Right after the page becomes Please remember that added peripherals should be preferably assigned with ADD PERIPHERAL 04 RM O 1 other plant peripherals assign please refer to chapter 6 3 PRESS PERIPH BUTTON DMO 3 After adding the peripheral press key ESC to confirm and exit the page Fig 10 26 WARNING If you add a Display Module on a plant that already includes 16 Display Mo
18. its display off Fig 6 26 Fig 6 27 Display Module ON not configured and not assigned Display Module ON configured and assigned If the Display Module is correctly configured and assigned the display shows some dashes if no assigned sensor is under alarm condition otherwise shows status and main features of alarmed sensors Normally if more alarms are present the Display Module scans the alarms in order of importance 2T 1T A new alarm or a variation of a current alarm for example passing from 1T to 2T gets display priority until a normal scanning cycle starts again S GAS s L E L If arrows are displayed it means that other sensors are under alarm condition 04 CH4 09 A and can be displayed before and after the current one Press keys to browse Fig 6 28 vertically the alarm conditions In case of problems on the communications BUS line or internal fault that prevent information exchange with the Central Unit the Display Module shows this message Fig 6 29 User Manual LYC40 Rev 06 51 Siemens Building Technologies September 2001 HVAC Products SIEMENS 7 Operation Logic There are two operating modes selectable from the MENU CONFIGURATION 1 Positive Logic factory preset in case of no alarm all the relays of Relay Modules and Central Unit are energized and are de energized in alarm or fault condition 2 Negative Logic in case
19. of sensor G methane P LPG O carbon monoxide B gasoline vapors In normal operating conditions the Central Unit receives information about measurements from the sensors for which three switching thresholds and a fault condition are defined 1 pre alarm 2 first alarm threshold 1T 3 second alarm threshold 2T 4 failure FA 10 User Manual 40 Rev 06 Siemens Building Technologies September 2001 HVAC Products STEMENS Figure 2 1 available sensor types 55 CATALYTIC CATALYTIC STANDARD 64055 PROFESSIONALE Sensor Pellistor ELECTROCHEMICAL CELL EEXdIIC CATALYTIC CATALYTIC CATALYTIC ELECTROCHEMICAL CELL Note sensors for gasoline vapors are available on request Fig 2 1 User Manual 40 Rev 06 September 2001 11 Siemens Building Technologies HVAC Products SIEMENS If the gas concentration exceeds these thresholds Pa 1T 2T the Central Unit sends a command to the Relay Modules LZY40 associated to activate the correspondent alarm relay The Central Unit transfers the alarm information also to associated Display Modules The maximum number of peripherals that can be connected to each Central Unit is 99 As number of peripherals we mean the total amount of sensors Relay Modules and Display Modules These latter cannot be more than 16 3 INSTALLATION 3 1 Installation of Central Unit LYC 40 The case has four flexible supports for front panel
20. panel LEDs for relay and operating status monitoring Red LED high Operating status fast blinking LZY40 not configured slow blinking LZY40 configured steady on alarm or fault Yellow LED Module fault relay status FA Red LED 3 Pre alarm relay status Pa First alarm threshold relay status 1T Second alarm threshold relay status 2T Power supply 12VDC Power consumption 2 5VA max Protection degree 42 vertical mounting Allowable room temperature 0 50 C Allowable room humidity 20 90 RH non condensing User Manual LYC40 Rev 06 85 Siemens Building Technologies September 2001 HVAC Products SIEMENS 11 2 3 Display Module LZD40 The Display Module allows a remote view of the current or still unrecognized alarms in order of importance 2T 1T Pa for a maximum of 8 messages Alphanumerical backlight display 2 lines by 16 columns that automatically turns off if there is no current or happened alarm Power supply 12VDC Absorbed Power 2VA max Protection degree 42 vertical mounting Allowable room temperature 0 50 C Allowable room humidity 20 90 RH non condensing In case of alarm this information is displayed Current or Current measure stored status Siemens Building Technologies 86 User Manual LYC40 Rev 06 HVAC Products September 2001 SIEMENS 12 DIMENSIONS 12 1 Central Unit LYCAO User Manual 40 Rev 06
21. polluted environment Alarm thresholds of methane and LPG detectors varies from 5 to 50 LEL while for carbon monoxide varies from 5 to 500ppm The following table shows the risks from exposition to carbon monoxide CO The carbon monoxide is generates everywhere there is a combustion process and is quickly absorbed by the lungs diffusing in the capillary alveolar membrane and is irreversibly bound with the hemoglobin as carboxilhemoglobin COHb Moreover it is colorless and odorless therefore one cannot realize naturally it is present For this purpose dedicated detectors are necessary User Manual LYC40 Rev 06 7 Siemens Building Technologies September 2001 HVAC Products SIEMENS These effects on health of COHb in the blood of sane adults are recognized COHb EFFECTS 0 3 0 7 Normal rate in non smokers due to internal production of CO 0 7 2 9 Physical troubles not detectable 2 9 4 5 Heart troubles in patients affected by heart disease 4 6 Usual values for smokers problems in psychomotor tests 7 10 Troubles in patients not affected by heart disease increase in heart throughput and blood flow in coronaries 10 20 Light headache weakness possible effects on the fetus 20 30 Heavy headache nausea reduction in hand motion capacity 30 40 Heavy headache irritability confusion reduction of sight capacity nausea muscular weakness dizziness 40 50 Convulsion and state of unconsc
22. to negative MAIN MENU INSTALLATION STATE LIST OF SENSORS EXPIRED SENS LIFE Fig 7 13 Siemens Building Technologies HVAC Products 54 User Manual LYC40 Rev 06 September 2001 STEMENS 8 PLANT STATUS Information given in this chapter is useful to understand the next chapter The peripherals can have the following status FA fault A activated D deactivated EP expired sensors only Their meaning is explained below 8 1 Fault status A peripheral that does not answer a call from the Central Unit is automatically set to fault status The operator can manually preset a peripheral to fault status FA just for programming time and with the only aim to physically detect it in the plant its status LED is steady on The Central Unit keeps track of all the peripherals in FA status including their addresses A peripheral removed without being previously erased for example to be replaced later is recognized by the Central Unit as FA In particular if a sensor is in FA status the Central Unit disables all its associations 8 2 Activated status This is the normal operating status factory preset for each peripheral User Manual LYC40 Rev 06 55 Siemens Building Technologies September 2001 HVAC Products SIEMENS 8 3 Deactivated status A peripheral can be deactivated only manually by the operator It has a different meaning depending on the type of peripheral considered sensors deactiv
23. 1 2v User Manual LYC40 Rev 06 Septarbene Rey as shown above to move the cursor right Siemens Building Technologies HVAC Products SIEMENS Fig 6 22 When a sensor exceeds the preset pre alarm threshold PR or first alarm threshold 1s or second alarm threshold 2s the corresponding relays of the assigned Relay Module are energized To browse horizontally press key gt to browse down press If for example there were a fifth sensor to be assigned move the cursor right as indicated below S02 S03 S04 S05 S01 502 503 504 am i Press the key shown above to move the cursor right Fig 6 24 E Fig 6 23 Press ESC to confirm the assignements and revert to page MAIN MENU INSTALLATION STATE pl LYC40 Rev 06 September 2001 Siemens Building Technologies 48 HVAC Products LIST OF SENSORS EXPIRED SENS LIFE v STEMENS Fig 6 25 Once the assignement task is finished the plant is ready to operate 6 4 Checking the correct operation of the sensors To verify the correct operation of the sensors is necessary to follow carefully the information below to prevent wrong actions that could damage in permanent way the sensing element Totestthe sensor use the same type of gas for which the sensor is built The gas test bottle must be calibrated to a concentration lower than the maximum measurable by the
24. 6 7 Display after configuration of the first sensor Fig 6 8 Display after configuration of the fourth sensor Press configuration button After configuring all the sensors go near the Relay Modules remove their front cover and press following the filled table order configuration button for about 2s the status LED starts blinking slow Press this button to configure the Relay Module Siemens Building Technologies 44 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS After configuring the Relay Modules configure Display Modules in a similar way NEW INSTALLATION Fig 6 11 504 RMO1 DMO 1 PRESS PERIPH BUTTON DMO 1 Press this button to configure the Displav Module After finishing the configurations and making certain all the peripheral LEDs are ON and blinking slow one flash every 105 close all the front covers and carry out the ASSIGNEMENTS between sensors Relay and Display Modules Press to revert to otherwise the Central Unit displays the last configuration page until 15 minutes timeout MAIN MENU INSTALLATION STATE gt Fig 6 12 Display after configuration of four sensors IL I ST OF SENSORS one Relay Module and one Display Module EXPIRED SENS LIFE 2 times Fig 6 13 User Manual LYC40 Rev 06 45 Siemens Building Technologies September 2001 HVAC Products SIEMENS 6 3 Assignements A simply configured plant in case of alarm
25. OOM 1 BOILER 2 8 3 METHANE ROOM 1 BOILER 3 9 4 CARBON MONOXIDE ROOM 1 AT CENTER 10 5 11 6 12 RELAY MODULES Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors Pa LAMP 1 LAMP 1 ROOM 1 1 4 1T VALVE 1 3 ROOM 1 3 4 1 VALVE 3 2T MAIN VALVE 2T MAIN VALVE FA FA Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors LAMP 2 Pa 2 ROOM 1 2 4 1T VALVE 2 4 1T 2T MAIN VALVE 2T FA FA DISPLAY MODULES Number Display Module location Associated Number Display Module location Associated sensors sensors 1 ROOM 1 ENTRANCE 1 2 3 4 3 2 4 Table 3 2 Siemens Building Technologies 22 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 4 WIRING After installing the Central Unit and peripherals and filling the table 3 1 carry out the required wiring This operation is to be made by skilled personnel and complying with local safety regulations Further observe these minimal rules for a correct plant operation 1 Power cable can be placed together with other existing cables provided they are not a high frequency line 2 communications BUS is to be placed a dedicated or double metal housing and far enough from power cables and high frequency lines 3 shield should be grounded or connected to power negative 12V selected by internal jumper An
26. RAL from MENU CONFIGURATION REPLACE PERIPHERAL REPLACE PERIPHERAL TO CONFIRM 02 DM PRESS gt A 5 SEC SIMULTANEOUSLY 5 sec GAS LPG Fig 10 14 Fig 10 15 User Manual LYC40 Rev 06 73 Siemens Building Technologies September 2001 HVAC Products SIEMENS Please note that the Central Unit offers only the already deleted peripheral addresses in this example sensor 502 Press the button displayed and then the peripheral button Please remember that it is possible to replace a peripheral keeping the same address only using a peripheral of the same type and model a CH4 sensor be replaced only by another CH4 sensor When finished if 502 was the only deleted peripheral the page will look like this REPLACE PERIPHERAL If peas bs REPLACE PERIPHERAL previously deleted an S02 DM you activate REPLACE NOTHING TO REPLACE PRESS PERIPH BUTTON PERIPHERAL ALL IN ORDER command the page look SU like the figure at right Fig 10 16 Fig 10 17 10 4 Add peripheral A new peripheral can be added when you need to expand a plant In this case reconsider consumption table and check that the new situation complies with power source and cable cross section is still adequate This command can be used also in case of incomplete initial configuration see page 43 From MAIN MENU go to ADD PERIPHERAL in this way MAIN MENU MAIN MENU 4 INSTALLATION STATE
27. STEMENS CENTRALIZED SYSTEM FOR GAS LEAK DETECTION IN INDUSTRIAL ENVIRONMENTS LYC40 USER MANUAL STEMENS TABLE OF CONTENTS 1 GENERAL INFORMATION NR AR EN R NR KE D X DR TRE X E T LX DE RD XE T X D E EO X X T RT E T AX D TR T DA T E E 6 1 1 MEANING OF GYMBOLS 25 ot eR docet RT A ues 6 1 2 GAS DEGREE OF RISK x ettet ie dec men etie ttu sen D TREE ROTE TUE 7 2 SYSTEM DESCRIPTION iiie innu da n b d P EV C E DE EX E EC E T C E OD E C E TE ET C E E DR ET T RE 10 3 annor cnn 12 3 1 INSTALLATION OF CENTRAL UNIT LYC 40 enne nenne nennen n 12 3 2 LM 14 3 3 INSTALLATION OF RELAY MODULES AND DISPLAY MODULES a 17 3 3 1 Installation on supporting guide EN 50 022 17 3 3 2 Wall mo nting sce copes s eee avila ee al a ee 19 3 4 NUMBERING OF PERIPHERALS Z u uN a tice eec FR D Fa Of pvo e Load vive ts 20 4 WIRING 23 4 1 toed we tie Dac clerk
28. TRICAL FAULT 9 M L 1 VAPOURS UNDERGROUND PARKING 15 THRESHOLD L COMMAND FOR PARKING EXTRACTOR 2 SPEEDS PREALARM SIGNALING 15 THRESHOLD ALARM INTERVENTION 2nd THRESHOLD ALARM INTERVENTION TOWARD THE SAFETY CHECK POINT TOWARD THE SAFETY CHECK POINT TOWARD THE SAFETY CHECK PDINT COMMAND FOR ADDITIONAL EXTRACTOR Un 51 User Manual LYC40 Rev 06 September 2001 93 Siemens Building Technologies HVAC Products SIEMENS POWER SUPPLY DETECTION OF CARBON MONOXIDE AND GASOLINE VAPOUR POSITIVE LOGIC IN UNDERGROUND PARKING ZONE 1 ZONE 2 ZONE 3 LZY4 LZY40 end st ELECTRICAL End st ELECTRICAL THRESHOLD THRESHOLD PREALARM FAULT THRESHOLD THRESHOLD PREALARM FAULT 7 1214 end Ist ELECTRICAL THRESHOLD THRESHOLD PREALARM FAULT KPA T PREALARM SIGNALING 15 THRESHOLD ALARM INTERVENTION end THRESHOLD ALARM INTERVENTION TOWARD THE SAFETY CHECK POINT TOWARD THE SAFETY CHECK PDINT TOWARD THE SAFETY CHECK PDINT KS2 KSe KS1 KPA COMMAND FOR PARKING EXTRACTOR COMMAND FOR ADDITIONAL SPEEDS EXTRACTOR e Siemens Building Technologies 94 User Manual LYC40 Rev 06
29. ULES POINT BY POINT 6 1 Button and LED functions The Central Unit has a keyboard and an alphanumerical backlit display 4 lines by 20 columns Key functions are indicated in the following figures Programming enter Values status change Display up down browse Enter page Set data confirmation Siemens Building Technologies 40 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS LZY40 LZD40 oe d Operating status LED lt FAILURE Relay status LED lt __ PRE ALARM relay status LED 1st ALARM threshold relay status LED 2nd ALARM threshold relay status LEE Display browse keys if current alarms are more than one QA 40 S Status LED Status LED User Manual LYC40 Rev 06 41 Siemens Building Technologies September 2001 HVAC Products SIEMENS 6 2 Configuration This operation starts from the status of the Central Unit and peripherals as per chapter 5 and consists in recognizing all the peripherals setting up the new plant by the Central Unit After turning on the system the various components are in this status RELAY MODULES all relays energized relevant LEDs ON and status LED blinking fast DISPLAY MODULES display OFF and status LED inside blinking fast SENSORS status LEDs blinking fast CENTRAL UNIT all relays energized relevant internal LEDs ON NOTE If a new plant includes a peripheral already configu
30. arameters like thresholds and operating status to tailor the plant for his her requirements It is also possible to make alarm simulations to check that wiring for solenoid valves blinkers etc is correct From main page act as follows MAIN MENU INSTALLATION STATE LIST OF SENSORS EXPIRED SENS LIFE v Fig 8 3 Fig 8 4 the arrow indicates that the table continues below The page indicates that the plant includes one methane sensor two LPG sensors two carbon monoxide sensor one Relay Module visible pressing key from fig 8 4 two Display Modules visible pressing key from fig 8 4 Symbols indicate no alarm threshold has been exceeded no device is faulty The following example shows the display in case two methane sensors in pre alarm status the third sensor in alarm status and the carbon monoxide sensor in fault status User Manual LYC40 Rev 06 57 Siemens Building Technologies September 2001 HVAC Products SIEMENS To access information below act as follows QT Pa 1T 2T FA 4 Fig 8 6 Stites Fig 8 7 To display the features of a peripheral move up and down using the proper keys in order to align it with the cursor then act as follows MES 42 25 LEL 12 LELY Fig 8 8 Fig 8 9 Figure 8 9 lists the peripherals order of alarm importance Siemens Building Technologies 58 User Manual LYC40 Rev 06 HVAC Products Septem
31. arm threshold closes the solenoid valve associated to the boiler and in case of second threshold alarm closes the main gas valve User Manual 40 Rev 06 33 Siemens Building Technologies September 2001 HVAC Products SIEMENS BOILER BOILER BOILER 3 Fig 4 14 main solenoid valve 1 solenoid valve 2 solenoid valve 3 solenoid valve Caution The Central Unit can be powered both from 230V and from an external UPS at 12V through the special terminal box These power sources are to be used alternatively and never at the same time see fig 4 16 Siemens Building Technologies 34 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS Fig 4 15 shows a heating plant made with fan coils distributed in a building Each fan coil has a gas valve and a methane sensor If a detector signals a gas leak the associated Relay Module activates as follows 1 in case of pre alarm activates a light signal 2 incase offirst alarm threshold closes the gas valve for the controlled fan coil 3 ifatleast one sensor exceeds the second alarm threshold the main gas valve is closed Fan coil Main solenoid valve 1 solenoid valve Fan coil solenoid valve 2 Fan coil solenoid valve 3 Fan coil solenoid valve i User Manual 40 Rev 06 September 2001 35 Siemens Building Technologies HVAC Products SIEMENS 5 PLANT SUPPLY After installation and wiring
32. ation of a sensor causes its deassociation with all assigned Display and Relay Modules including the Central Unit relays though keeping available other data like gas concentration reading lifetime threshold setup values etc DM and RM deactivation of a Relay Module or Display Module causes deassociation with all assigned sensors A faulty peripheral cannot be deactivated 8 4 Expired status The Central Unit can display the residual lifetime of each sensor indicated in weeks this value can be read in programming page at LIFE field When the lifetime reaches zero its sign becomes negative the system continues operating and counting lifetime weeks but there is no warranty that the sensor works correctly From the MAIN PAGE menu go to EXPIRED SENS LIFE line and press All sensors whose guaranteed lifetime is expired are listed If there is no expired sensor the display shows the message in figure 8 1 If there are some expired LIST OF EXPIRED SENS sensors a page like figure LIST OF EXPIRED SENS NONE 8 2 is shown S03 012 WEEKS 501 009 WEEKS 607 002 WEEKS Fig 8 1 Fig 8 2 ESC Press key to revert to main page Siemens Building Technologies 56 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 8 5 Display and change of a peripheral parameters The operator can display the features of a peripheral in order to get more practice about the plant status Moreover he or she can change such p
33. ber 2001 STEMENS LEL gt L EL LELY 1T 2T 20 40 L E L STATE ACTIVE 42 LIFE 255 Fig 8 11 Current measure of gas concentration To change sensor threshold or status parameters enter programming mode and act as follows Pa 1T 2T 10 20 40 GAS CH4 STATE ACTIVE MESURE 42 LIFE 255 Fig 8 13 03 Pa 1T 2T SET gt 10 20 40 GAS CH4 STATE ACTIVE 1T 2T 20 40 B STATE ACTIVE Press for 5sec until 42 LIFE 255 you hear Programming cursor Fig 8 13 1T 2T 20 40 STATE ACTIVE MESURE 42 LIFE 255 gs A255 Fig 8 14 m to increase and to Fig 8 15 User Manual LYC40 Rev 06 59 Siemens Building Technologies September 2001 HVAC Products SIEMENS 03 Pa 1 2 S03 Pa 1T 2T SET 11 20 40 LEL 10 20 40 LEL 4 STATE ACTIVE 4 STATE ACTIVE MESURE 42 LIFE 255 MESURE 42 LIFE 255 Fig 8 16 Fig 8 17 Pressing key you move the cursor right and using keys it is possible to change the other sensor thresholds To change the operating status move programming cursor as in fig 8 18 and act as follows ally 503 1 2 11 20 40 503 1 2 11 20 40 4 STATE MESURE 42 LIFE 255 GAS CH4 STATE ACTIVE MESURE 42 LIFE 255 Fig 8 18 Fig 8 19 Pressing key again the status beco
34. cable cross section is User Manual LYC40 Rev 06 27 Siemens Building Technologies September 2001 HVAC Products SIEMENS S 2 581 3 0 860 since the calculated value is lower than 2 5mm2 we choose 2 5mm leads anyway 4 3 Terminal box recognition All the terminal boxes clearly show both power and BUS terminal polarity Never change polarity 4 31 Central Unit terminal boxes Terminal box layout on the Central Unit is shown below Lv Lah Lat BAT ECL LLII LL N C NONC C NONC NO NC et Input K2 K3 K4 K5 Input for 230Vac FA Relay Pr Relay 1T Relay 2T Relay back up 12V battery Note the FA relay on Central Unit energizes in case of fault of any peripheral sensors and or Relay Display Modules 4 3 2 Sensor terminal box BUS shield BUS output 12V 30W max output to periph power supply 12V Input from external UPS Siemens Building Technologies 28 HVAC Products User Manual LYC40 Rev 06 September 2001 STEMENS Figures 4 6 4 7 and 4 8 show terminal box layout for the two sensor types Fig 4 7 BUS 12V Terminal boxes BUS shield BUS input Input 12VDC power supply Fig 4 8 3 Fig 4 6 User Manual 40 Rev 06 29
35. cannot activate the various devices solenoid valves hooters etc since the alarm commands of the sensors are not transferred assigneded to any Relay Module Assignement with the Display Modules has the purpose of displaying the sensor status in a place different from the Central Unit installation site Starting from the main menu press down arrow key until the cursor moves to ASSIGNEMENTS You get the following display and from here you enter programming mode pressing keys and simultaneously until you hear MAIN MENU MAIN MENU INSTALLATION STATE gt Afp 1 LIST OF SENSORS by MENU CONFIGURATION EXPIRED SENS LIFE Fig 6 14 Fig 6 16 DIAGNOSTIC SYSTEM Fig 6 15 Please note that assignement table is initially blank Enter programming mode as follows 502 503 504 503 504 A t User Manual LYC40 Rev 06 Siemens Building Technologies September 2001 HVAC Products Press for 5sec until you hear a beep STEMENS Fig 6 17 Fig 6 18 Programming cursor 501 502 503 504 601 502 503 504 gt 4 Pressing key an X appears at right of the cursor In this case Fig 6 19 indicates that sensor S01 is assigned Fig 6 20 with relay module 01 S01 S02 S03 S04 gt E Fig 6 21 To remove the assignement the X press key as shown above S02 503 504 505 RM01 gt IJ 1 DM0
36. ctions placed 90 The sensor is placed down 6 hours and cable entrance right 3 hours The sensing element is placed inside the case in a threaded connection of approved type IP55 versions have a square aluminum case with the same sensor positions 6 hours and cable entrance 3 of Eexd version Allowable room temperature 0 50 C Allowable room humidity 20 90 RH non condensing Expected life time Catalytic sensor 255 weeks in clean air Expected life time Electrochemical cell 150 weeks in clean air INTERV ENTION DEGREE OF QAG40SS CATALYTIC 12VDC 1 6VA 0 50 LEL IP55 QAP40SS CATALYTIC 12VDC 1 6VA 0 50 LEL GPL IP55 ELECTROCHEMICAL CELL QAO40SS 2 TERMINALS 12VDC 0 7VA 0 500 ppm CO IP55 L QAG40PS PELLISTOR 12VDC 15VA 0 50 LEL CH4 IP55 L QAB40PS PELLISTOR 12VDC 15VA 050 LIE IP55 Gasoline vapors a L ELECTROCHEMICAL CELL QAO40PS za 3 TERMINALS 12VDC 0 6VA 0 500 ppm CO IP55 QAG40SE CATALYTIC 12VDC 1 6VA 0 5096 LEL EExdllC QAP40SE CATALYTIC 12VDC 1 6VA 0 50 LEL GPL EExdllC ELECTROCHEMICAL CELL QAO40SE de 2 TERMINALS 12VDC 0 7VA 0 500 ppm CO EExdll QAG40PE PELLISTOR 12VDC 1 5VA 0 50 LEL EExdlIC QAP40PE PELLISTOR 12VDC 1 5VA 0 50 LEL GPL EExdlIC H4 PG H4 H4 PG QAB40PE PELLISTOR 12VDC 15VA 0 50 LIE Gaseline vapers 83 i ser Manual LYC40 Rev 06 Siemens Building Technologies ELECTROCHEMICAL CELL
37. dules the Central Unit displays this page CAUTION ADDITIONAL DISPLAY MODULES NOT PERMITTED MAX 16 Fig 10 27 WARNING If you try to add a peripheral on a plant including 99 peripherals the Central Unit shows this message CAUTION ADDITIONAL Siemens Building Technologies PERIPHERAL NOT RAS Products PERMITTED MAX 99 User Manual LYC40 Rev 06 September 2001 STEMENS Fig 10 28 Press key repeatedly until the Central Unit shows the main page 10 5 Plant Reset If the operator should realize he she made serious mistakes compromising a regular installation or think the plant configuration is not suitable with his her requirements the Central Unit allows to reset the whole plant In this case all the peripherals including the Central Unit revert to their default configuration like they had never been installed Then proceed as for a NEW INSTALLATION For a plant RESET act as follows MAIN MENU 4 MENU CONFIGURATION gt MAIN MENU INSTALLATION STATE DIAGNOSTIC SYSTEM LIST OF SENSORS EXPIRED SENS LIFE DISPLAY SETTINGS Y Fig 10 29 Fig 10 30 User Manual LYC40 Rev 06 77 Siemens Building Technologies September 2001 HVAC Products SIEMENS MAIN MENU MENU CONFIGURATION MENU CONFIGURATION gt NEW INSTALLATION DIAGNOSTIC SYSTEM NEW CENTRAL UNIT DISPLAY SETTINGS DELETE PERIPHERAL Fig 10 31 Fig 10 32 MENU CONFIGURATION MENU CONFIGURATION
38. e help and not as AN INSTALLATION RULE User Manual 40 Rev 06 15 Siemens Building Technologies September 2001 HVAC Products SIEMENS WARNING This graph indicates simple units and gives indicative information Indicates the volume floor area and ceiling height covered by a sensor Height from the floor m Tene 30 eM S 5 s ees Coverage of a sensor m Fig 3 5 User Manual 40 Rev 06 16 Siemens Building Technologies HVAC Products September 2001 SIEMENS 3 3 Installation of Relay Modules and Display Modules Relay Modules MR are called LZY40 and Display Modules MD are called 17040 they can be mounted both on a supporting guide and on a wall 3 3 1 Installation on supporting guide EN 50 022 Needed tools No 1 medium small size flat head screwdriver Set and secure horizontally a supporting guide long not less than 100mm and lean the module to the upper end of the guide Then slowly but firmly push down until you hear the spring click against the lower guide end see figures 3 6 and 3 7 Fig 3 7 User Manual LYC40 Rev 06 17 Siemens Building Technologies September 2001 HVAC Products SIEMENS To disengage the sensors from a guide pry with a small screwdriver in the special opening inside the case fig 3 8 and 3 9 The cables should enter through the special opening in the case lower side These openings are closed by some plastic co
39. erminal box to main BUS line shield e last peripheral and only on it is to be closed BUS termination Jumper fig 4 4 z di Terminal box Terminal box N H End of QA 40 QA 40 QA 40 LZD40 LZY40 Line QA 40 QA 40 40 QA 40 LZY40 Fig41 CORRECT WIRING Fig42 WRONG WIRING Siemens Building Technologies 24 User Manual LYC40 Rev 06 HVAC Products September 2001 SIEMENS Figure 4 3 shows a possible layout of the terminal box Q 54 54 Terminal box From previous To next terminal box terminal box BUS cable shield can be connected on the Central Unit to power supply negative ground To the peripheral Fig 4 3 Sensor Relay Module or Display Module Fig 4 4 End of line Jumper on the peripherals User Manual LYC40 Rev 06 25 Siemens Building Technologies September 2001 HVAC Products SIEMENS 4 2 Cable sizing and consumption The calculation of consumption of each peripheral added to those of other loads powered at 12V valves hooters blinkers etc is fundamental to decide how the plant must be supplied In particular if the sum of consumptions is lower than 30W 1W it is possible to supply the plant directly from the Central Unit On the contrary an external supply through an UPS Uninterruptible Power Service is needed Power and current of each peripheral and some loads are listed in the follo
40. ey ESC confirms any changes made to the operating status User Manual 40 Rev 06 63 Siemens Building Technologies September 2001 HVAC Products SIEMENS 9 AUXILIARY FUNCTIONS The LYC40 allows to access further detail information useful to the operator both to know the plant status at any time and to make any changes to alarm parameters and assignements MAIN MENU Any operation made on the Central Unit starts from the first page main page INSTALLATION STATE gt LIST OF SENSORS EXPIRED SENS LIFE Fig 9 1 9 1 List of sensors From main page press key until the cursor reaches the line LIST OF SENSORS MAIN MENU LIST OF SENSORS EXPIRED SENS LIFE ASS 1 Fig 9 2 Alarm thresholds exceeded Pa 1T 2T Siemens Building Technologies 64 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS To access the individual features of the selected sensor set the cursor to its line and act as follows 1T 2T 20 40 00 LIFE 255 Fig 9 5 Figure 9 4 lists the sensors in numerical order that coincides with the order listed in the table filled in before 9 2 Diagnostics The Central Unit features can be read under DIAGNOSTIC SYSTEM that can be accessed from the main page pressing key MAIN MENU LYC40 Vers 1 005 DIAGNOSTIC SYSTEM av AZ am Text vers 1 01 DISPLAY SETTINGS C U code 00001 ALARM RESET n of periph
41. following figure called main page MAIN MENU INSTALLATION STATE LIST OF SENSORS EXPIRED SENS LIFE Fig 5 3 To revert to the display in figure 5 2 switch the system off and switch it on again after some seconds User Manual LYC40 Rev 06 37 Siemens Building Technologies September 2001 HVAC Products SIEMENS 5 2 Troubleshooting Any wiring error can be evidenced as follows CAUSE EFFECT BUS connections exchanged on the Central Unit The Central Unit beeps three times then waits until a correct connection is restored to be made after switching the plant off The display shows an error message like figure 5 4 BUS connections exchanged on one or more peripherals The peripherals cannot be configured Power leads exchanged to peripherals The unit s concerned has have all its their LEDs OFF Power leads exchanged BUS leads Possible component damage peripherals OFF Branches on communications line Possible lack of communications between Central Unit and peripherals End of line jumper close on an intermediate peripheral Peripherals cannot be configured at the end of the BUS line Communication BUS length more than 1000m Peripherals cannot be configured at the end of the BUS line Table 5 1 Siemens Building Technologies HVAC Products 38 User Manual LYC40 Rev 06 September 2001 STEMENS NOTE If a peripheral has BUS connections exc
42. hanged the Central Unit since configuration button is depressed does not recognize the peripheral signal on the BUS Several trial are made to establish a correct communications link but after a timeout that can be long also some minutes this message is shown cyclically ERROR BUS INCORRECTLY WAIT PLEASE CONNECTED WAITING FOR ACTION The concerned peripheral can be detected through its status red LED steady on Moreover the Central Unit FA relay is de energized cyclically with the same period of messages in fig 5 4 IMPORTANT If the peripheral with exchanged BUS connections were for example number 5 the Central Unit at the next startup after reset keeps the configuration of the first 4 peripherals showing the main page All the remaining peripherals from number 5 on needs to be configured You can act in two ways 1 the configured peripherals are few it is better to RESET the plant and start the configuration again see chapter 10 5 2 Ifthe configured peripherals are many it is better to keep them as they are and configure the remaining with the ADD PERIPHERAL command see chapter 10 4 User Manual LYC40 Rev 06 39 Siemens Building Technologies September 2001 HVAC Products SIEMENS 6 COMMISSIONING A NEW PLANT Before starting up the plant it is better to familiarize with its different components CAUTION BEFORE STARTING UP CAREFULLY READ THE PROCEDURE DESCRIBED IN THIS CHAPTER AND FOLLOW THE R
43. imultaneously until you hear a beep Fig 10 7 Cursor Fig 10 8 To select the peripheral move the cursor right pressing key until it is placed left of the device to be deleted Example if you want to delete sensor 502 press key to increase the peripheral ID number Press key to decrease this number DELETE PERIPHERAL DELETE PERIPHERAL 601 01 2 502 01 DMO2 5 5 SEC GAS CH4 GAS LPG Fig 10 9 Fig 10 10 Siemens Building Technologies 72 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS DELETE PERIPHERAL DELETE PERIPHERAL 02 RMO 1 2 502 01 2 5 SEC t n DELETED S02 GAS LPG Fig 10 12 Fig 10 13 When a peripheral is deleted its address becomes available It is presented in case of peripheral replacement with a new one of the same type see REPLACE PERIPHERAL command After deletion press ESC to exit the page 10 3 Replace peripheral This operation is needed when you want to replace a peripheral with a new one of the same type The replaced peripheral keeps the configuration of the old one This operation is accomplished in five steps Delete the peripheral to be replaced using command DELETE PERIPHERAL chapter 10 2 Switch the plant OFF Remove the peripheral and replace it with a new one Switch the plant ON Give REPLACE PERIPHERAL command from the Central Unit to deletion act as described above then select REPLACE PERIPHE
44. iousness 60 70 Coma collapse death Table 1 2 Similar tables and a wide literature on this subject are available The publication Air quality for CO by the US Health Education and Welfare department deals with sight capacity decrease with 3 COHb and other psychomotor tests with 5 COHb More recently a reduction of motion capacity in people exposed to a dose of 100 ppm for one hour has been demonstrated Siemens Building Technologies 8 HVAC Products User Manual LYC40 Rev 06 September 2001 STEMENS ppm 1 000 000 100 000 10 000 1 000 100 10 1 VOL 100 10 0 1 0 01 0 001 0 0001 combustion impossible LEL methane 100 Lower Explosivity Limit 40 20 Fig 1 1 User Manual LYC40 Rev 06 September 2001 Siemens Building Technologies HVAC Products SIEMENS 2 SYSTEM DESCRIPTION The system is set up by a Central Unit LYC40 and some peripherals communicating each other through a common line BUS and a dedicated protocol PYC40 Each Central Unit has its own factory defined ID code These types of peripherals are available 1 Module LZY40 2 Display Module LZD40 3 Sensors 40 For complete list of sensors please refer to table at page 86 E EExdlIC T6 housing S IP55 housing P catalytic professional sensor Pellistor S catalytic standard sensor Type
45. mes FAIL and pressing once again you revert to ACTIVE Press ESC to confirm the operating status chosen and to exit programming page For more details about ACTIVE INACTIVE and FAIL please refer to chapters 8 1 8 2 8 3 It S possible to view the operating status of Relay and Display Modules following the same procedure used for the sensors Starting from main page go to the page shown in fig 8 6 and act as follows Siemens Building Technologies 60 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS QT Pa 1T 2T FA 4 Fig 8 22 Fig 8 23 This example easily explains that the only Relay Module in the plant is activated and no alarm threshold has been exceeded WARNING Now the operator can carry out a functional plant test Enter programming mode by pressing and keys for at least 5s and manually force all the Relay Module relays Consequently all connected devices should activate in turn hooters solenoid valves etc User Manual LYC40 Rev 06 61 Siemens Building Technologies September 2001 HVAC Products SIEMENS RM ST 1 2 AD 1 a Od AG oe W press the two buttons simultaneously for 5sec until you hear a beep Fig 8 24 Fig 8 25 programming cursor It is also possible to change operating status for Relay and Display Modules While the cursor is in the position shown in fig 8 25 press key the AC RM activated is replaced by a D
46. ming cursor Indicates there is further information above the displayed page a ft gt Cursor Indicates there is further information below the dis Table 10 E2 e Not used 11 1 1 Internal Jumper function Selects BUS shield connection type BUS shield connected to power negative BUS shield grounded User Manual 40 Rev 06 81 Siemens Building Technologies September 2001 HVAC Products SIEMENS E10 RS485 termination E11 RS485 termination E13 CAN BUS termination Connect CAN BUS shield to power negative 11 2 Peripherals Each peripheral has a power supply input 12VDC a communications BUS line an internal configuration button and a 3 status LED Fast blinking peripheral to be configured Slow blinking peripheral configured one flash every 10sec Steady on sensor under alarm or fault condition Pa 1T 2T or FA The LED can be forced steady on on the Central Unit see chapter 8 1 This helps finding the configured peripheral in the plant 11 2 1 Sensors Qax 40 yz The sensors need a 12VDC power supply and have their control logic for communications and electronics aimed to gas concentration measurement and alarm management Siemens Building Technologies 82 User Manual LYC40 Rev 06 HVAC Products September 2001 SIEMENS Explosion proof versions EExd T6 have a round die cast aluminum case with two threaded conne
47. mounting fig 3 2 The supporting panel should have a thickness of 1 5 to 6 mm and the Central Unit is secured by pressure from outside to inside of the panel Needed tools No 1 flat head medium size screwdriver Act as follows 1 Make an opening of 234 x 138 mm on the panel front side 2 Insert the Central Unit in this opening and push it until the hooks perfectly fit in the panel The Central Unit is to be securely fit 3 Remove the plastic covers on the cable entrance point using a screwdriver 4 Check that the control panel conditions meet with temperature and humidity installation requirements see technical data In case the internal power supply is used it is advisable to remove all the plastic covers on cable in holes in order to facilitate an air cooling flow Siemens Building Technologies 12 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS Opening to be made on front panel for securing the LYC40 Flexible supports for front panel mounting Fig 3 1 Fig 3 2 User Manual LYC40 Rev 06 13 Siemens Building Technologies September 2001 HVAC Products SIEMENS 3 2 Sensor installation The sensors should be installed at different heights in accordance with the type of gas to be detected see fig 3 3 x 20 cm from QAG40 the ceiling Methane 1 5 2m 40 carbon monoxide CO from the floor 20 cm from the floor w QAP40 GPL QABAO gasoline vapors Fig 3
48. n automatic mode the Central Unit recognizes the peripherals reconstructing the same configuration of the old Central Unit This operation can last some minutes while status LEDs are blinking fast NEW CENTRAL UNIT In this phase the S DM SELF CONFIGURATION S the self configuration Fig 10 3 When the self configuration It appears when the automatic procedure NEW CENTRAL UNIT cannot be correctly executed some sens i i i respective number of pheriperals will incease as the Central Unit proceeds in NEW CENTRAL UNIT 503 01 DMO 1 SELF CONFIGURATION DMO 1 Fig 10 4 MAIN MENU INSTALLATION STATE gt LIST OF SENSORS EXPIRED SENS LIFE v Fig 10 6 NEW CENTRAL UNIT WAIT PLEASE is completed the Central Unit displays the main page Fig 10 5 AUTOMATIC PROCEDURE NOT POSSIBLE MAKE 71 INSTALLAT UMRESET OF September 2001 Siemens Building Technologies HVAC Products SIEMENS 10 2 Delete peripheral The need to delete a peripheral arises when it is necessary to change the plant for example removing a sensor that is no more required or when you want to replace a peripheral with an new one Start from MENU CONFIGURATION select field DELETE PERIPHERAL and press key A This page is shown DELETE PERIPHERAL DELETE PERIPHERAL TO CONFIRM 1 2 gt A 5 SEC SIMULTANEOUSLY GAS CH4 s
49. of no alarm all the relays of Relay Modules and Central Unit are de energized and are energized in alarm or fault condition It is possible to change the operation logic following this procedure INSTALLATION STATE gt MENU CONFIGURATION LIST OF SENSORS DIAGNOSTIC SYSTEM EXPIRED SENS LIFE DISPLAY SETTINGS Fig 7 1 Ns oc Fig 7 2 MAIN MENU MAIN MENU MAIN MENU MENU CONFIGURATION MENU CONFIGURATION gt NEW INSTALLATION DIAGNOSTIC SYSTEM NEW CENTRAL UNIT DISPLAY SETTINGS Y DELETE PERIPHERAL Fig 7 3 Fig 7 4 Siemens Building Technologies 52 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS MENU CONFIGURATION NEW INSTALLATION NEW CENTRAL UNIT MENU CONFIGURATION 4 LOGIC 12 ALARM MODE DELETE PERIPHERAL Fig 7 5 MENU CONFIGURATION LOGIC ALARM MODE Fig 7 7 To change the logic type enter programming mode LOGIC POSITIVE NEGATIVE Fig 7 9 Fig 7 6 LOGIC POSITIVE NEGATIVE Fig 7 8 LOGIC POSITIVE NEGATIVE Press for 5sec until you hear a beep Fig 7 10 Programming cursor User Manual LYC40 Rev 06 September 2001 53 Siemens Building Technologies HVAC Products SIEMENS LOGIC POSITIVE NEGATIVE Fig 7 11 Press key to revert to positive logic Press ESC two times to confirm and revert to main page LOGIC NEGATIVE POSITIVE Fig 7 12 Press the key shown above to change logic from positive
50. red on another plant when this latter is turned on it excludes itself setting its status LED to fast blinking and waits for being reconfigured Siemens Building Technologies 42 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS As already shown at paragraph 5 1 the Central Unit at first start up automatically sets to NEW INSTALLATION command line MENU CONFIGURATION NEW INSTALLATION NEW INSTALLATION AD agp ar TO CONFIRM NEW CENTRAL UNIT E PRESS DELETE PERIPHERAL S IMULTANEOUSLY Fig 6 2 Fig 6 3 NEW INSTALLATION NEW INSTALLATION PLEASE S DM PRESS PERIPH BUTTON Fig 6 4 Fig 6 5 Figure shows the configuration display IMPORTANT When configuring follow the order indicated in compiled table 3 1 WARNING The Central Unit automatically exits configuration status 15 minutes after the last button on a peripheral has been depressed or manually pressing button User Manual 40 Rev 06 43 Siemens Building Technologies September 2001 HVAC Products SIEMENS To complete configuration act as follows Go to each sensor installation site remove the cover and press the inner configuration button for about 2s waiting the status LED blinks slow one flash every 10 seconds Every time a peripheral is recognized the page updates and indicates the last accepted peripheral thus confirming it has been acknowledged by the Central Unit ig
51. sensor e gas flow must reach the sensing element for diffusion or however with very low speed To obtain this it can be used a special flow box as explained in the picture below e Gas test is detected by the sensing element with a delay of 10 or more seconds this is due to the syntherized filter The same delay may occur when the gas flow stops until the sensor doesn t detect it anymore NOTE If a plant is not designed for Relay and Display Modules the ASSIGNEMENTS page is not active installed sensor will be always assigned with the Central Unit internal relay RMO User Manual 40 Rev 06 September 2001 Siemens Building Technologies Sensor HVAC Products Gas test SIEMENS 6 5 Error messages NO PERIPHERAL PRESENT It appears when in a not configured installation the command DELETE PERIPHERAL is selected ADD PERIPHERAL NO PERIPHERAL USE It appears when in a not configured installation the INSTALLATION command ADD PERIPHERAL is selected CENTRAL UNIT LOCKED DUE TO SEVERE FAILURE It appears when the Central Unit detect an internal failure that cannot be repaired It is necessary to call the service Siemens Building Technologies 50 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 6 6 Display Module visualization The Display Module shows any alarm detected by the assigned sensors A Display Module not configured and not assigned has
52. st THRESHOLD PREALARM GENERAL GENERA GENERAL INTERVENTION PREALARM ELECTRICAL FAULT Ist ALARM INTERVENTION OF PERIPHERALS THRESHOLD THRESHOLD BUS AND lev DC INTERRUPTION ELECTRICAL FAULT OF 12140 MAXIMUN LENGHT DF BUS CONNECTION 1000 m MINIMUM SECTION DF POWER SUPPLY CABLE 25mm User Manual 40 Rev 06 91 September 2001 Siemens Building Technologies HVAC Products SIEMENS EXAMPLE INSTALLATION WITH 1 DC EXTERNAL PD R SUPPLY WITHOUT BACK UP BATTERY LYC40 LZY40 ELECTRICAL ELECTRICAL end THRESHOLD 154 THRESHOLD PREALARM FAULT 2nd THRESHOLD Ist THRESHOLD PREALARM FAULT 1 BUS 12VDC A x GENERAL GENERAL 0 end ALARM Ist ALARM PREALARM ELECTRICAL INTERVENTION INTERVENTION ELE THRESHOLD THRESHOLD ASSOCIATED FAULT Eno ALARM Ist ALARM 1 1 OF PERIPHERALS OF ASSOCIATED OF ASSOCIATED N 5 OF 12140 THRESHOLD THRESHOLD BUS AND DC SENSORS SENSORS INTERRUPTION Siemens Building Technologies 92 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS ea0v ZONE 1 0 ELECTRICAL end THRESHOLD THRESHOLD PREALARM FAULT THRESHOLD SUPPLY DETECTION OF CARBON MONOXIDE AND GASOLINE LZY4 NEGATIVE LOGIC ZUNE 2 ELEC
53. the LYC40 some information about general characteristics of gases and installation criteria of gas detection systems Reading this chapter is not indispensable for installation and commissioning of the system People who already know the argument can skip this chapter 1 1 Meaning of Symbols The symbols used in this manuals have the following meaning ppm Parts Per Million gas Lower Explosivity Limit VOL gas percentage by unit of volume S Sensor RM Relay Module LZY40 DM Display Module LZD40 S switch threshold Pa pre alarm threshold 1T first alarm threshold 0 2T second alarm threshold c DO RON Siemens Building Technologies 6 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 1 2 Gas degree of risk Risk conditions for gases and combustible vapors start from a threshold called Lower Explosivity Limit LEL that represents the minimum gas concentration value beyond which in case there is a primer the mixture explodes This values varies from a gas to another The following table lists LEL values for the most common gases LEL 100 GAS TYPE ppm VOL METHANE 4 50 000 5 ISOBUTANE iso C4H10 18 000 1 8 4 10 18 600 1 86 LPG MIXTURE 19 000 1 9 HYDROGEN H2 40 000 4 Table 1 1 As to toxic gases like carbon monoxide CO the risk level is to be considered in relation with personal exposition time in the
54. ut to upper level optional Relay Module RMO always assigned with all plant peripherals consisting of four relays with these functions K3 energized if any sensor is in pre alarm conditions Pa K4 energized if any sensor is in first threshold alarm 1T K5 energized if any sensor is in second threshold alarm 2T K2 energized if any peripheral is out of order FA that is does not communicate with the Central Unit power fault or BUS interruption Each relay is provided with voltage free exchange contact 230VAC 5A 9 User interface through a backlight display 4 lines 20 columns 6 control keys 10 Maximum BUS allowable length 1000m 11 Degree of protection IP40 12 Allowable room temperature 0 50 C 13 Allowable room humidity 20 90 RH non condensing Function keyboard with these commands YILA Display up and down browse lt escape gt Press in programming mode to revert to previous page and store any modified parameters During normal operation is used to revert to previous page lt enter gt To move from page to next information level Siemens Building Technologies 80 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS E If pressed simultaneously for at least 5sec set the Central Unit to programming mode where provided While in programming mode control increment decrement of the value or operating status change Program
55. ve For wide plants it could not be sufficient ad should be expanded Siemens Building Technologies 20 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS PLANT CONFIGURATION and ELEMENT NUMBERING SENSORS Number Type of detected gas Sensor location Number Type of detected gas Sensor location 1 7 2 8 3 9 4 10 5 11 6 12 RELAY MODULES Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors Pa Pa 1 1T 3 1T 2T 2 Number Relay Module location Associated Relay outputs Number Relay Module location Associated Relay outputs sensors sensors Pa Pa 2 1T 4 1T 2T 2T FA FA DISPLAY MODULES Number Display Module location Associated Number Display Module location Associated sensors sensors 1 3 2 4 Table 3 1 With reference to the plant shown in Fig 4 14 this is an example of filling of table 3 1 User Manual LYC40 Rev 06 21 Siemens Building Technologies September 2001 HVAC Products SIEMENS PLANT CONFIGURATION and ELEMENT NUMBERING SENSORS Number Type of detected gas Sensor location Number Type of detected gas Sensor location 1 METHANE ROOM 1 BOILER 1 7 2 METHANE R
56. vers to be removed with a screwdriver Pay attention not to damage the electronics Pry with a screwdriver to disengage the device Fig 3 8 Fig 3 9 Cable in Siemens Building Technologies 18 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS 3 3 2 Wall mounting Needed tools No 1 small medium size crosshead screwdriver No 3 wall plugs 6mm dia No 3 screws for wall plugs 6mm No 1 drill No 1 wall drill bit 6mm VC pa OS PO Supporting guide housing DIN Wall mounting holes Fig 3 10 Three wall holes in correspondence with the three holes on the case back side The higher one is slot shaped the lower ones are to used after the upper screw has been securely fastened User Manual LYC40 Rev 06 19 Siemens Building Technologies September 2001 HVAC Products SIEMENS 3 4 Numbering of peripherals After installation number all the peripherals as follows 1 Fit a label to each sensor in a visible position and write on it a progressive ID number from 1 through N where is the number of installed sensors Any numbering criterion can be adopted for example you can group the sensors by type or by area or by any other way fig 3 13 2 Use the same numbering system both for Relay Modules LZY40 and Display Modules LZD40 In both cases like for the sensors numbering starts from 1 see figures 3 11 and 3 12 The following table can be filled in with all of the data listed abo
57. wing table POWER CURRENT LOAD POWER CURRENT Watt Ampere Watt Ampere 6 0 5 12 1 LYC40 Electronics Solenoid valve LZY40 2 5 0 208 12V 6Ah BATTERY 7 0 583 LZD40 2 0 166 QAG40SS 1 6 0 133 4055 0 7 0 058 4055 405 405 QAP40SE QAG40PS 1 5 0 125 QAO40PS 0 6 0 05 QAP40PS QAO40PE QAG40PE QAP40PE ACOUSTIC SIGNAL 4 0 333 SIGNAL LAMP 2 0 166 Table 4 1 Total power calculation is made as follows Siemens Building Technologies 26 User Manual LYC40 Rev 06 HVAC Products September 2001 STEMENS P total P1 P2 P3 Pn Watt Current total P total 12 Ampere The power cable cross section is calculated with the following formula rounded to the next existing cross section value In any case the minimum section should not be lower than 2 5 mm Cable section Current total 3 mm If for example we consider the plant in Fig 4 13 equipped with 1 three methane sensors 5 hooter 2 carbon monoxide sensor 6 signal lamp 3 Relay Module 7 battery 4 solenoid valve Absorbed power are shown in table 4 2 CONSUMPTION Qty UNIT POWER TOTAL POWER TOTAL CURRENT Sensor QAG40SS 3 1 6W 4 8W 0 4 Sensor QAO40SS 1 0 7W 0 7W 0 058 Relay Module LZY40 1 2 5W 2 5W 0 208 Solenoid valve 1 12W 12W 1 Hooter 1 2W 2W 0 166 Signal lamp 1 2W 2W 0 166 Battery 1 7W 7W 0 583 TOTAL 31W 2 581 Table 4 2 The power
58. y grounding should be made on an end only and close to the power supply while connection of the next sections is shown in Fig 4 3 Note maximum allowable length for communications BUS is 1000m 4 1 Cable types 1 Power cable use flameproof cable NO7VK of cross section suitable for the loads connected to the Central Unit see table 4 1 We suggest not to exceed current density 2 Communications BUS BUS connections should be made using a shielded twisted pair with features equivalent to Belden cables type 9841 or 3105 RESISTANCE IN DC NOMINAL NOMINAL CAPACITY TYPE N OF PAIRS IMPEDANCE AWG LEADS SHIELD BETWEEN LEADS LEAD SHIELD pF m pF m BELDEN 9841 1 78 7 11 0 120 42 0 75 5 24 BELDEN 3105A 1 48 2 9 5 120 36 1 65 5 22 User Manual LYC40 Rev 06 23 Siemens Building Technologies September 2001 HVAC Products SIEMENS Communication bus structure e Maximum length of BUS line should not exceed 1000 m Maximum distance for BUS connection between branch point and Peripheral should not exceed 8 m Connection line should be unique and peripherals are to be connected to it No braches are allowed BUS cable shield is to be grounded on one point only eg near to Central unit A further grounding along the line would not assure cable shield equipotential Shield of the BUS cable portion between branch and peripheral should be connected through t

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