ST-431 - Kotly.com.pl
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1. T AA ENDS 7 TSecteh ps 7 ACEINWateQ Oe d nee A OD UI a a a re utra 7 IIb C Screen VEW E qaidam 7 PAAR ER ES 7 IHI e Manual operation ee 8 E MER ies ERR B r r ANA 8 Iig Servicihg TGS 8 HT n Eanguage selectlollavexis ueriteas I E navas e Few eee 8 ILE D Factory SCCUN OS qud eR d afia ea M nA UI maed ed us dun e ad noa Hia DM Dad aad 9 HI ADOUt the es ERE ERES RR DR UR CR RUPES 9 IB Meni TE OU Do D LISTER 9 IVa Sumner WMO GS acd OC ida dv e HER AS RAS 9 SEO 9 IVC BOIIGFSSSOF duse burdiis YusC eis Qi ada Uwixr tu ost icut qe var i 10 IV c 1 Return 10 26 2 Boller DFOESGCUOTI sided us pesto fe sacco a e veda x robe x vea Rs 10 PUtip actlVatlOfisscenustatadddbextviddbwbboxe eti au E E ante usa ap PP Rd 10 Temperature Dus VES ea EO POF Eq rp pud d 11 IV e Reduction in room control esses eme eene nens 11 IV ROOT 11 IV Proportionality 11 IV h Maximum floor 12 Obenind aitectiODissasceaivetebqaq edu M EROS Pra Ne DC IO DEF aude aT 12 IV Operation miOUeS2. Users Manual 5 31 W W W TECH REG COM ST 431 user manual Declaration of Conformity No 42 2010 Hereby we declare under sole responsibility that the ST 431 230V 50Hz thermoregulator manufactured by TECH ul St Batorego 14 34 120 Andrychow is compliant with the Regulation by the Ministry of Economy Journal of Laws Dz U 155 Item 1089 of July 21 2007 implementing provisions of the Low Voltage Directive LVD 2006 95 EC of January 16 2007 The ST 431 controller has been tested for electromagnetic compatibility EMC with optimal loads applied For compliance assessment harmonized standards were used PN EN 60730 2 9 2006 Jura Janusz Master High voltage Make sure the regulator is disconnected from the mains before working on the power supply cable connections device installation etc All connection works must only be carried out by qualified electricians Before activating the controller measure the motor resetting efficiency and inspect wire insulation THE DEVICE MAY BE DAMAGED IF STRUCK BY A LIGHTNING MAKE SURE IT IS UNPLUGGED DURING STORMS Il Application Thermoregulator type ST 431 is intended for operation of three or four way mixing valve with a possibility of connecting additional valve pump Optionally the controller may cooperate with two modules ST 61 which enables to control altogether three mixing va
3. P verre iura vibus ERU EP Vd vais 12 IV UMO avos au Pisos chives pce Rau Sra sae esa A dE Fab aan d 13 IVe WMI SECD PEE T UIT 13 IV mo MINIMUM OPENIN O S a Pu Pines 13 IV D Val GLY De 14 EVE Ol VIN RERO E TEM 14 TD 16 IVe F Communication OO 16 5 Weatner Dascd CONE Ol seseina aaa a 16 ENWSSKIRSGONRLFOI anaed DUREE une 17 Wes UNC tamales 19 SEIS RC EE 19 VAL sessi Guanine pd sd Denn Ra daa rad PEE x dep Ea Do Aron Cesar 20 VI MOUMUNG nm 20 22 293 User s Manual 5 31 All faults should be reported to TECH Sp j Wieprz 1047A 34 122 Wieprz k Andrychowa Tel 48 33 8759380 48 33 8705105 48 33 8751920 48 33 8704700 48 33 8454547 serwis techsterowniki pl Monday Friday 7 00 16 00 Saturday 9 00 12 00 WWW TECIT REG COM
4. frequency of the water temperature behind the valve for the CH or the HUW system If the sensor indicates a change in temperature deviation from the set value then the electric valve will open or close by the set stroke in order to return to the set temperature 3 Opening time In this function the time of full opening of the valve is set in other words time in which the valve is open to the value of 100 This time should be selected according to the owned valve servomotor stated on the rating plate 4 Unit step In this function per cent unit stroke of valve opening is set namely which maximum opening or closing percent may each time be performed by the mixing valve maximum valve movement in one measurement cycle 5 Minimum opening In this function the minimum value of the valve opening is set Below this value the mixing valve will not close any further 6 Valve type With the use of this option the user selects the type of the valve CH or floor 7 Weather based control By means of this parameter it is possible to adjust the temperature set for valve 1 for respective values of external temperatures On the basis of agreed points values for intermediate points are calculated TEMP FOR 20 TEMP FOR 10 TEMP FORO NU TEMP FOR 10 Temp zadana dia 20 Temp zadana dia 10 H Temp zadana dla 0 Temp zadana dia 10 A detailed description of this f
5. user manual Using this function initial setting of the valve is controlled During calibration the valve is set to a safe position that is for CO valve to a fully open position while for floor valve to a closed position During calibration at the bottom of the screen the following symbol is displayed ply l ZAW R Kalibracja Prazze Praca r czna Pompa Henu instalatora stop enu seriis OTHieranie zamykanie Hyb r j zyka zamykanie After selecting option manual operation user has possibility of manually opening closing the valve and additional valves if active and Switching on or off the pump for the purpose of inspection of the correct operation of the device Installer menu Praca reczna Henu instalatora Menu Hub r j zyka Functions included in installer menu will be described in detail in subsequent chapters of this manual Servicing menu Praca ni ET Hejcia Henu instalatora Heny seriis of 0 Hub r jezuka Functions included in the servicing menu are protected by code and are not available for the user Language selection WYBR JEZYKA Praca reczna Polski PL Menu instalatora Angielski EMG Henu seris Hiemiecki DED Hub r j zyka Czeski CZ A user can select the language version of the controller 11 1 Factory settings U
6. COEFF 10 IV h Maximum floor temperature MEHI IHS TALATORA MAS FOOROGOLIA Obni enie poko Regulator Hep Proporcjon Temp Podfogowa E 40 maxSS This is the maximum temperature which does not damage floor installation Setting this temperature is used when valve type is set as the floor type After reaching this temperature a complete valve closure takes place and a user is informed about that by means of a relevant alarm If the maximum floor temperature is reached the boiler protection function is deactivated In this case the floor installation protection will have a higher priority IV i Opening direction IHSTRLERTOFR EE KIERUHER OTLIEFRFnRHIF kierunek Tryby pracy Czas otwarcia Skok jednostkowy If after connection of the valve to the controller it turns out that it was to be connected the other way round then the power supply cables do not have to be switched it is enough change the opening direction in this parameter LEFT RIGHT IV j Operation modes IHSTALATORA TEYB Y FRACY TEYB Y kierunek otwierania Standardowy Tugodni rdka Tryby pracy ster pokojowe Czas otWarcia ater Skok Fokoj pogod In this function user selects the working mode between STANDARD the controller maintains the preset temperature at the valve exit level R
7. data Temperature control range 8 C 90 C Power supply voltage 230V 50Hz 10 Power consumption max 4W Temperature endurance of the sensors 25 C 95 C Ambient temperature 5 50 C Load at each outlet 0 54 Fuse insert 1 6A ATTENTION In the case of the lack of flow in the short circulation of the boiler improperly mounted system the return sensor should be placed at the outlet of hot water from the boiler to prevent its boiling VI Mounting ATTENTION Installation should be performed by a person with relevant authorizations At that time the device cannot be live make sure that the plug is disconnected from the network Connection of wires VALVE RETURN SENSOR SENSOR FUSE 1 6A L2 L N 20 a l E Pa Schematic diagram 3ATVA NOILVIVLSNI 300714 HOSN3S 3A TVA 35 3 LINDYID JHOHS X a f ldOMVZ 2 FATWA ONIXIIN 43 108 NOLLV TVLSNI H2 19 15 19 15 3015110 9 L VAY a HOLV1NOFY WOO YE TETES _ 21 ST 431 user manual Contents AD WCG 5 Principle SPO OO 5 IH a MalhiDagdeuiceiseisvala in TES Vico caret tatiana E dd Edda 6 PLE
8. OOM CONTROL the controller maintains the temperature of the valve till the moment in which room the regulator gives the signal about heating up of the room contact opening Then the preset temperature will be reduced by the temperature value set for parameter REDUCTION IN ROOM CONTROL 12 l see chapter IV e The reduced preset temperature will not be displayed the main screen of the controller The information that the room regulator indicated that the room is heated up is signalled by room regulator symbol lt p gt continuous display not pulsating WEATHER CONTROL the preset valve temperature depends on the temperature outside It is calculated on the basis of parameters saved in functions Weather based control see chapter IV s ROOM AND WEATHER CONTROL in this mode when the room regulator does not reach the set temperature valve operates just as in weather control At the time when the room is heated up to the set temperature of the regulator the valve starts to operate in mode room control at achieved room control While this mode is active on the display the symbols of weather contro and room control pulsate alternately After reaching the temperature preset by the controller the symbol p room regulator heated up will be displayed permanently WEEKLY CONTROL the preset valve temperature depends on the deviations defined for particular weekdays in Chapter Weekly contro see item IV t In this mode room c
9. STAWIEHIA FABR YCZHE Ustanienta Fabryczne Informacja programie The regulator is pre configured for operation However it should be adjusted for own needs Return to the factory settings is possible at any moment By activating the factory settings option all own adjustments are replaced by the settings saved by the manufacturer From that moment the own parameters may be set once again About the program Ustanienta Fabryczne Informacja o programie After activating this option the display shows the boiler manufacturer s logo along with software version of the regulator IV Installer menu IV a Summer mode IHZTRHLRHTORH Tryb letni Antystop pomp Czujnik kotla Kontrola temperatury 4 In this mode the regulator closes CO valve so as not to heat house unnecessarily but in the case of achieving too high temperature of the boiler requires activation of the return protection the valve will be open in emergency mode This mode is not active in the case of controlling floor valve IV b Pump anti stop MEHU INSTALATORA Tryb letni Antystop pomp Czujnik kotla kontrola temperatury After activating this option pump valve will activate every 10 days for 2 minutes It prevents too long water stagnation in the assembly beyond the heating season ST 431 user manual IV c Boiler sensor MEHI IHS TALATORA TEMP ZADAHA Tryb letni Antystop pomp 26 Stopni Czujn
10. al temperatures 20 C 10 C 16 09 and 10 C The more points constructing the curve the greater its accuracy which allows its flexible shaping In our case four points seem a very good compromise for large accuracy and for easiness of setting of the course of this curve Temperatura zadana za zaworem Temperatura zewnetrzna Where in our controller 209C 109C Xc 100C Ya Ys Yc Yo preset valve temperatures for respective external temperatures Xa Xs IV t Weekly control INSTALATORA Tryb komunikacji Hytaczona Ustam tryb 2 Trub 1 kasowanie danych Tryb 2 tryb 1 This function is used for programming daily temperature changes behind the valve The set temperature deviations are in the range of 10 9 Step one A user must first set the current time and date Installer menu Timer Step two The user sets temperatures for particular weekdays Set mode 1 FOHIEDBZIREEE Poniedziatek Htorek a Niedziela 3 O2 00 02 00 01 Lll zc _ CzHartek ST 431 user manual In this mode specific hours and the requested deviations from the preset temperature should be marked by how many degrees the temperature is supposed to raise or drop in a given hour for each day of the week Additionally t
11. cotta Migdy ET Stopni Zalaczenie pompy progu Temp za pompy This option allows to select the working mode of a pump A pump shall be activated always pump operates all the time regardless of temperatures never pump is permanently deactivated and the regulator controls only operation of the valve above the threshold the pump is activated above the set activation temperature In the case when the circulation pump is connected with the boiler controller it is recommended to 10 deactivate its operation in the driver of valve ST 431 IV d Temperature control MEHI IHS TALATORA Tryb letni Antystop pomp Czujnik kotla kontrola temperatury This parameter determines water temperature measurement control frequency behind the CH or HWT installation valve If the sensor indicates a change in temperature deviation from the set value then the electric valve will open or close by the set stroke in order to return to the preset temperature IV e Reduction in room control IHSTALATORA OBHIZEHIE Obni enie Regulator Propaorcjan Temp Podfogowa 4 This function is active only in the case when valve cooperates with the room regulator In this setting one should preset the temperature by which the valve decreases its preset temperature at the moment of achieving the preset temperature at the room regulator r
12. ely it will be 50 C In turn during weekend Saturday Sunday from 4 p m to 7 99 p m the preset temperature of the valve will increase by 5 C namely it will be 65 C Step three Mode A user activates one of the two previously set modes Model Mode2 or deactivates the weekly control option completely After activating one of the modes on the controller homepage in the place 18 ELE of preset text the preset temperature the digit with the value of the currently preset deviation shall be pulsating informing at the same time about the weekly control activity IV u Timer MEHI IHS TALATORA USTALI Tryb komunikacji s 3 10 AG Tugadni rdka FRODA By setting the timer a user defines the current time and weekday Without setting the time correct operation of the weekly control is not possible VI Protections To ensure the maximally safe and reliable operation the regulator has several protections In the case of alarm a sound signal is activated and a relevant message is shown on the display To make the controller return to work press pulse generator In the alarm manual work is possible but it should be completely ensured whether our activities will not result in damages The controller has the following alarm protections 1 Temperature alarm stops the valve temperature regulation and sets the valve in the safest position For floor valve it is closing and for CH
13. g the user selects the type of the controlled valve between CH it is set to adjust CH circulation temperature FLOOR it is set to adjust floor heating circulation temperature Floor type protects the installation from dangerous temperatures If the valve type is set as CH and it will be connected to floor system this may result in the destruction of fragile floor installation IV o Valve 1 INSTALATORA REJESTRACJA Hinimalne otarcie Rejestracja Fodaj numer modutu Typ Za czony 23aNor 1 kontrola temperatury 0 9 4 2 Czas Controlling additional valve is possible after purchasing and connecting to the controller control module ST 61 which is not provided in the standard version of the controller To control two valves two modules ST 61 should be connected This option is used to set operation of an additional module of the mixing valve To make sure that the valve works properly in accordance with the user s expectation is should be registered by entering the module number this is number of the valve in accordance with the documentation and then several parameters should be set 1 Activated So that the selected valve would be active select option gt Activated Yes When it is necessary to deactivate the valve for some time the user selects Activated No 14 2 Temperature control This parameter determines the sampling control
14. ik kotla kontrola temperatury 10 maxSS In this submenu the user determines basic boiler protection parameters and pump activation IV c 1 Return protection C2UJHIK KOTLA OCHRONA FOWROTU TEMPERATURA MIH Uchrona powrotu Za czona Ochrona kotla Temperatura min B n Stopni Zalaczenie pompy min 10 80 This function permits setting the boiler protection against too cool water returning from the main circulation which could cause low temperature boiler corrosion The return protection operates in the way that when the temperature is too low valve is closed until the short circulation of the boiler reaches the appropriate temperature After activating it user presets the minimum acceptable return temperature IV c 2 Boiler protection C2U IHIE KOTLA KOTLA KOTLA Uchrona Ochrona kotla Temperatura max Zalaczenie pompy The protection against too high return temperature serves to prevent the hazardous growth in boiler temperature The user sets the maximum acceptable return temperature In the case of the hazardous growth in temperature the valve begins to open to house installation in order to cool the boiler down This function is activated permanently the possibility of deactivation only in the service menu IV c 3 Pump activation KOTLA cALACZEHIE Formers ZAE powrotu Zazie Ochrona
15. ike in the previous case register valve 2 additional and configure adequately all settings in the same manner as in the case of valve 1 IV r Communication mode MEHU INSTALATORA TRYB komunikacji blhowny Tugadni rdka The user may set the communication mode as main independent subordinate in cooperation with the with primary controller mounted on the boiler If the communication mode is selected as subordinate the valve controller operates as a module and all its settings are made from the boiler controller IV s Weather based control IHZTRHLRHTORH Tryb komunikacji By means of this parameter it is possible to adjust the set valve temperature for relevant values of external temperatures On the basis of agreed points values for intermediate points are calculated TEMP FOR 20 TEMP FOR 10 Za czona Temp zadana dla 0 TEMP FOR 0 Hytaczona Temp zadana dia 10 TEMP FOR 10 Temp zadana dia 20 Temp zadana dia 10 i Heating curve it is a curve according to which the set controller temperature is determined on the basis of external temperature In our controller this curve is constructed on the basis of four points of set temperatures for respective values of external temperatures Set temperatures must be determined for extern
16. ller pump outlet from regulator TS 431 will remain disconnected The control takes place with the use of pulse generator knob Entering the menu and confirming settings proceed by pressing the knob When turning it a user operates in MENU functions To go to the higher level menu use exit button Any settings may be changed in a similar manner ll a Main page During normal regulator operation graphic display shows the homepage on which the following are displayed WORKING oa gt TAHDRROOL Y BOILER PROTECTION OCHRONA FOLIROTU PUMP OPERATION ACTIVE MODULES ACTIVE VALVE By turning the pulse generator the preset temperature may be changed easily After pressing pulse generator knob the user moves to the main menu To change appearance of the homepage to the view of temperature sensors or one of the additional valves if active press EXIT Then after choosing another screen homepage view is changed WIDOK EKRANU Ekran Temp 1 ZaMNDr 2 STAHDARDOL D AR Coy Ill Main menu Set temperature TEMP 2nbnHhn Temp za czony 26 Stopni Hidok ekrany kalibracja 3 minio max55 With this option the requested temperature the valve is supposed to maintain is set In the course of correct operation the temperature of water behind the valve
17. lves The controller is equipped with weather control function 1 week program and may cooperate with the room regulator An additional advantage of the device is the protection of return temperature which fulfils the function of protection against boiling of the water in the short boiler circulation or against too low temperature of the water returning to the water boiler Il Principle of operation Description of the control panel PRESET XA OPENING PERCENTAGE TEMPERATURE STANDBY EXT 4 ooo PULSE GENERATOR MODE STANDBY 2 OY The principle of operation of the controller to valve servomotor is based on mixing feed circulating warm water with water returning from the heating circulation in order to set the desired temperature and maintain it all the time at the same level A pump connected to each valve is supposed to help to distribute water in the system that is not based on gravitation circulation The pump should be installed behind the mixing valve while the temperature sensor should be placed behind the valve and the pump for the purpose of the most accurate control of the temperature at the valve outlet ATTENTION if the valve controller operates simultaneously in a common _5 ST 431 user manual circulation with the controller of the boiler the pump should be connected from the boiler contro
18. o facilitate the service there is a possibility to copy the settings Example Monday set 300 AM TEMP 10 temperature change 10 set 400 AM TEMP 10 temperature change 10 set 599 AM TEMP 10 temperature change 10 In this case if the set valve temperature is 60 on Monday from 390 to 6 the preset valve temperature shall drop by 10 C so it will be 50 C Instead of setting the temperatures for different days the temperatures in the second mode may be set collectively for working days Monday to Friday and weekend Saturday and Sunday Set mode 2 1 Monday Friday Saturday Sunday In this mode like in the previous one specific hours and requested deviations from the temperature preset for business days Monday Friday and on weekend Saturday Sunday should be indicated Example Monday Friday set 300 AM TEMP 10 temperature change 10 set 499 AM TEMP 10 temperature change 10 set 500 AM TEMP 10 temperature change 10 Saturday Sunday set 4 00 PM temperature 5 C temperature change 5 0 set 500 PM temperature 5 9 temperature change 5 set 699 PM temperature 5 9 temperature change 59 In this case if the temperature preset in the boiler is 60 C than from 3 00 a m to 6 a m every day from Monday to Friday the preset temperature of the valve will drop by 10 C nam
19. ontrol or weather control are disabled The information on active weekly control is pulsating on the main screen value of the current temperature deviation at the place of text preset IV k Opening time MEHI OTWARCIA kierunek otrerania Tryby pracy Czas ofHarcia Skok jednostkowy max 1500 Parameter specifying the time needed for the servomotor valve to open from 0 to 100 position This time should be selected according to the owned valve servomotor stated on the rating plate IV D Unit step MEHI IHS TALATORA JEQHOS TROY kierunek otrerania Tryby pracy Czas otwarcia Skok jednozfkaonu This is a maximum single stroke opening or closing that the valve may make during one temperature sampling If it is near the preset temperature the stroke calculated on the basis of WSP PROPORCJON parameter position The smaller the single stroke the more precisely the set temperature can be achieved However the preset temperature is being fixed for a longer time 13 ST 431 user manual IV m Minimum opening MEHI IHS TALATORA MIHIMALHE OTWARCIE Hinimalne otwarcie o Fracent 1 The parameter determines which valve opening may the smallest Thanks to that parameter the valve may be opened minimally to maintain the smallest flow IV n Valve type ZALORU Zanor CO podtogony By means of this settin
20. oom heat up NOTE If in function Room regulator see IV e option Closing is set then function Reduction in room control is inactive IV f Room regulator IHS TALATORA REGULATOR DLL Obni enie j rki Obnizenie jorki Regulator pokojowy i Hsp Froporcjon Max Temp Podtogowa 4 This option is used to set the manner in which the valve will react to a signal about room heat up from the room regulator If option Reduction in room control is selected then the valve after a signal about heating up from the regulator room will lower temperature behind the valve according to the set parameter Reduction in room control see IV e In the event when option Closing is selected the valve will react to the signal about heat up room with maximum closing see item IV m and deactivation of the pump IV g Proportionality coefficient IHSTALATORA LIEF Obni enie Regulator Hep Proporcjon Temp Podtogowa mindi 20 O 11 ST 431 user manual Proportionality coefficient is used for defining valve stroke The closer the preset temperature the smaller the stroke If this coefficient is high the valve will faster achieve the opening close to the relevant However the opening will not be accurate Single opening percentage is calculated on the basis of a formula SET TEMP SENSOR TEMP PROP
21. unction is included in Chapter IV s 8 Return protection This function permits setting the boiler protection against too cool water returning from the main circulation which could cause low temperature boiler corrosion The return protection operates in the way that when the temperature is too low valve is closed until the short circulation of the boiler reaches the appropriate temperature This function protects also the boiler against dangerously high temperature of return in order to prevent boiling of water After enabling this function the user sets the minimum and maximum acceptable temperature of return 9 Additional sensors After selecting this function the user has the possibility of selecting sensors from which the data on temperatures for the valve will be collected Temperatures can be collected from module sensors own or according to the _15 ST 431 user manual sensors of the main controller 10 Valve removal This function is used for a complete removal of the valve from the controller memory Va ve removal is used e g at disassembling the valve or module replacement re registration of a new module is necessary IV p Valve 2 MEHI IHS TALATORA Minimaln Rejestracja Podaj numer modu u Typ zaMNoru 3 1 kontrola temperatury 0 4 2 Czas oatWarcia If the user wants to control the second optional valve they should l
22. valve it is opening 2 Alarm VALVE SENSOR means an incorrect connection or lack of connection of the valve sensor or its damage It is a sensor strategic for valve operation therefore it should be replaced immediately 3 Alarm RETURN SENSOR alarm occurs when the return protection function is activated and the damage of this sensor takes place The return sensor should be then corrected or replaced There is a possibility of deactivating this alarm by switching off the return protection function but if a circulation does not have the protection against boiling of water at the boiler it may cause a permanent damage of the boiler or a part of circulation 4 Alarm WEATHER SENSOR occurs when external temperature sensor is damaged The alarm may be cancelled when an undamaged sensor is installed correctly The alarm shall be activated when valve operation mode is different than weather control or room control with weather control The regulator is equipped with WT 1 6A tubular fuse cartridge protecting the network ATTENTION The fuse of higher value should not be used Assembling the fuse with a higher value may cause damage to the controller 19 ST 431 user manual V Maintenance In controller TS 431 before the heating season and throughout its duration technical condition of wires should be checked Fastening of the controller should be also checked it should be cleaned from dust and other dirt Technical
23. will be approaching the preset valve temperature Activated ceAERNCCON TY Temp zadana Hidok ekrany Halibracja ZaHory This option is used to activate the mixing valve When the valve is deactivated then the pump does not operate either In spite of the fact that valve is deactivated calibration always takes place after switching the controller to the network It prevents remaining of the valve in a position dangerous see chapter III d for the circulation Screen view MIDDE Temp zadana Ekran Za czony Temp Hidok ekrany Zanor 1 Halibracja zaWoru 2 Using this function appearance of the homepage may changed between the views of the basic valve the view of the sensors temperatures or the view of parameters of one of additional valves only when the valves are active After selecting the view sensors temperatures the homepage the following temperatures are visible of the valve set and current return temperature and external temperature On the contrary selection of the view valve 1 or valve 2 results in displaying on the homepage parameters of the closed valve preset and current temperatures external temperature and return temperature and the percentage of opening of the chosen valve Valve calibration KALIBRACJA Temp zadana Za czony ZATWIEROS Hidok ekrany kalibracja ST 431
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