1 KRONOS GA11 WEEKLY-PROGRAMMING DIGITAL CHRONOTHERMOSTAT FOR THE REMOTE CONTROL OF HOT AIR GENERATORS THROUGH BRAHMA INTERFACE BOARD APPLICATION The digital chronothermostat Brahma Kronos series integrates the functions of room temperature control and remote control of hot air generators in a single interface, specially designed to make available all its functionalities in intuitive mode. Control of the heating system is complete, allowing to manage the parameters of more air generators, with the related control boards connected in cascade, and the eventual unlock. It is possible to choose beetween different modes of thermoregulation, even using an external probe (connected to the hot air generator) for climatic compensation. Weekly programmation is particularly versatile because it provides 4 temperature levels settable and no restriction number of time slots per day, consisting of individual intervals equal to a quarter of an hour and can be viewed on the appropriate graph of the daily program. The communication between the chronothermostat (master) and the control board (slave) of hot air generators takes place by means of a two-wire cable. Particulary, the data, between the chronothermostat and the control board of the first generator, are exchanged with the communication protocol compatible OpenTherm v3.0 Smart Power Mode - Medium Power. GENERAL TECHNICAL DATA Brahma design graphic LCD 128x64 pixel backlight timer 20 seconds LED for diagnostics/signaling 7 variable function keys weekly programming 4 temperature levels (T0, T1, T2, T3) resolution (0,5 C temperature set) resolution (0,1 C temperature read) minimum interval programming: 15 minutes SELV insulation (Safety Extra Low Voltage) bipolar connection, non-polarized protocol v3.0 Smart Power Mode Medium Power TECHNICAL DATA OF THE CHRONOTHERMOSTAT Operating temperature: 0 C +50 C Humidity: 95% maximum at 40 C Power supply: low voltage (3V), obtained from communication with the hot air generator control board Protection degree: IP30 Dimensions: 140x90x32 mm Compliance: directive 2004/108/CE (EMC), directive 2006/95/CE (LVD). PRELIMINARY 1/11
2 graphic display (LCD) multifunction button with LED buttons to select or change the function parameters buttons to increase and decrease temperatures and parameters hole for access to the reset button function buttons (the active command is indicated on the graphic display) Figure 1: description of the remote control unit INSTRUCTION FOR USE The Kronos GA11 provides the user with a graphic LCD dot-matrix, a series of buttons in silicon rubber, and an LED indicator located below a button plastic transparent to display the parameters and interact with the heating system. Figure 1. The buttons have any versatile utilization depending on the selected menu. The use of buttons is facilitated by the indications with text, icons and other graphics that appear on the display. The vertical buttons on the left of the display are typically used to navigate the setup menu or to select the parameters. The vertical buttons on the right of the display are used to vary temperature and the classical function increase / decrease (+ / -). To facilitate the change of set values, the long press of these buttons accelerates the increase or decrease. This choice can be changed later, if necessary, through the "SETTING MENU". Then the current time can be entered. The horizontal buttons at the bottom serve to confirm or cancel the settings, or to enter and exit the submenus. The center button to used for special functions as the unlock of the boiler. Under the center button there is an LED: LED with color red continuous: error or no communication with the hot air generators; LED with color red intermittent: hot air generators lockout; LED with color yellow intermittent: anomaly; LED with color green continuous: the chronothermostat is resuming work after a power failure. The most frequently used functions by the user are available in the main menu. It is possible to quickly browse through the pages to set, for example, room temperature or the maximum power of the hot air generators. Also in this case the buttons to the left allow you to select the various menu items, while the right buttons are used to change the values, the OK button stores the settings while the ESC button allows you to continue without changing the data time. If you press ESC, the subsequent reconnection of the cronothermostat (for example power down) you will again be prompted to select the language and set the current time. The first time or after a reset of the Kronos, appears the language menu, as shown in the figure below. Pushing buttton OK, you confirm the selection. PRELIMINARY 2/11
3 BASE FUNCTION FIRST LEVEL MENU When the chronothermostat is connected to a thermoregulation board, the following screen appears on the display. If the thermoregulation board is not compatible, you will receive an error message. Here there are the messages that may appear, alongside with their meanings: Starting Kronos is in the process of connection to the hot air generators. Ambient probe error Room temperature sensor on Kronos damaged. Fault code xxx There is an anomaly or a lockout on the hot air generators. Code xxx. Comm. error Communication error between Kronos and hot air generators. Error ID xx The Kronos fails to correctly interpret of information sent from the hot air generators. Note: Please refer to the thermoregulation board's documentation for detailed description of the fault codes and error codes. The buttons on the right, marked with + and -, allow to vary the temperatures required for the automatic program (T0, T1, T2, T3). Instead, in manual mode (icon ) allow to vary the set point room temperature. Pushing the buttons on the left, marked with arrows, you can browse the pages of first level menu. Pushing the button, the following display appears. In the figure the main screen. Above are shown the day of the week and the current time, these indications are intermittent if they are not updated. Below there is an indication of the temperature measured (measurement every 10 seconds); Beside, an icon indicates the function of thermoregulation currently active: in this case the image of a clock indicating the automatic mode. Corrispondence between icons and operation modes: Automatic Manual Summer Standby Temperature control environment according to the weekly program set by the user. Program seen as a graph of the current day. Temperature control environment in accordance with a user-selected temperature (thermostat function). Temperature control environment disable. Summer ventilation can be activated manually. Temperature control environment disable. Pushing the buttons +/- you can vary the temperature and pushing the button OK you activate the manual mode. Pushing again button, you can activate the "summer mode", which is not active environment thermoregulation. In automatic mode, the cronothermostat performs the temperature control program was set for the current day, the graph is visible at the bottom of the display. The graph is divided into time intervals of 15 minutes, corresponding to a pixel horizontally, and in the four programmable temperature levels. Near the icon of the operation mode other icons may appear. If the hot air generators is turned on appears flame symbol, different sizes depending on the modulation level of the flame ( ). If it present a lockout or a fault appear symbols (, ) respectively and if it is not present the connection icon appears symbol ( ). No icon appears in the visualization if the hot air generators is in stand-by and has no problem. The management of the cronothermostat by the user is much simplified. The functions are not distinct between the functions relating to hot air generators and functions relating to thermoregulation. If you select the "summer mode", you can turn summer ventilation through the function key [Vent.]. Once activated ventilation, a key mark becomes [V.OFF], and it is possible to stop the fan using the same key. Under the indication of the room temperature may be present, in addition, a line of text that provides information to the user in special cases, such as the presence of error or the status of additional functions PRELIMINARY 3/11
4 In this scren, it is possible to limit the power level required by the chronothermostat to generators, for heating the environment. For more details see the next section, in particular the description of the submenu "Thermoregulation". Pushing again button is proposed the submenu PARAMETERS MENU Pushing again button you switch to another option: The submenu "PARAMETERS MENU" (described in the relevant section) allows you to see the parameters of the hot air generators and allows you to manage advanced functions, such as transparent parameters (TSP) and unlock. This option allows you to turn off the system (temperature control environment and ventilation are disabled). The first level menu is circular, all the screens described above are accessible by pushing the reverse button. If you press, you will see the control panel of the heating system. Pushing again button is proposed the sub-menu SETTING MENU In "SETTING MENU" are set the calendar, the mode of thermoregulation and a weekly schedule. The "SETTING MENU" is described in a separate paragraph below. Pushing again button you enter the menu for setting maximum power. In the first row are displays the icons that illustrate the status of thermoregulation and generators with at the side, the number of generators (or control boards "slave") connected. In the central row are displays additional information about the status of generators or anomalies. In the third line, if available, is shown the value of outdoor temperature or errors related to thermoregulation environment. This menu has a frame fixed. The options previously seen remain displayed for 20 seconds, then the display returns to the main screen, which depends on the chosen operation mode. (manual, automatic, summer, off). In this option, however, if the user does not push ESC or not push or, the crhonothermostat continues to show the control panel with the relevant information. Pushing again the button you return to the first option. PRELIMINARY 4/11
5 To select the temperature level is necessary to push the buttons e, instead to vary the temperature value it is necessary to push + e. On the right side of the screen is shown the relative position of the current setpoint temperature value with respect to minimum values (5 C) and maximum value (30 C). The higher temperature is associated with T3 and the lowest temperature with T0, the chronothermostat meets the following constraint: T0 T1 T2 T3 and automatically resizes the temperatures. In case it is already active the automatic mode, it is indifferent push NO or OK. Choosing the option Day program you enter in the following screen. MANAGEMENT CHRONOTHERMOSTAT SETTING MENU This section describes the submenu SETTING MENU This submenu allows you to manage temperature control environment, the weekly program, the time setting and the language choosing. At the top of the screen you select the day, and at the bottom of the screen displays the day program. Pressing the + and - buttons you can select the day. For example, suppose you want to program the day "Monday", pressing OK button you enter the scheduling of time slots. The time slots are programmed in three steps: initial time, temperature and final time. Selecting the option Programming you enter in weekly program dedicated submenu. Choosing the option "Temperature" you enter in the screen setting of the four temperature levels T0, T1, T2 and T3. In the first step is set the starting time by pushing the + and - buttons at intervals of at least 15 minutes and you confirm pushing OK. However, if you want to quit the programming of the selected day, push ESC. In the second step, pushing the and you select which of the four programmed temperatures will be PRELIMINARY 5/11
6 associated to the time slot. Pushing OK you confirm the level of temperature and pushing ESC you return in the first step. As seen above, this setting is required when you first start or after a reset of the chronothermostat, then it can be changed at will. In the third step you select the ending time. The final time can not be less than initial time, selecting two coincident values for initial time and final time, the daily schedule is not changed. The last item, Heating Control of the "SETTING MENU", concerns the method used by the chrothermostat for controlling room temperature. The last item on the Programming menu allows you to copy the program day to another day. At the top you select the source day in the lower you select the destination day, You can also copy a program of the day all week and have the same program every day, to do this select as target the "ALL". When you press OK, a message confirms your copy of the program. Completed the description of the "Programming menu, we return to describe the sub menu "SETTING MENU". The Time setting submenu on the "SETTING MENU" allows adjustment of the current time and day of the week. In this screen you can set the differential, which can vary between 0.2 º C and 5.0 º C (default value: 2.0 º C). d is the thermal differential, Max is the maximum rate, Ti and Ta are the room temperature set and the room temperature measured. The required percentage P is calculated as follows: if Ta Ti - d then P = Max if Ti d < Ta < Ti then P = ( Max / d ) x ( Ti Ta ) if Ta Ti then P = 0 Example 1: Ti = 20,0ºC Max = 100% d = 0,5ºC If Ta 19,5ºC then P = 100%; If 19,5ºC < Ta < 20,0ºC then P = (100 / 0,5) x (20 Ta) %; if Ta 20ºC then P = 0. On the same page you can enter the hysteresis value (asymmetric) in order to avoid frequent restart of generators. Hysteresis may vary in steps of 0.1 º C between 0.1 º C and 50% of the set differential value. Pushing the and buttons you select the item you want to change, while pushing the + and - buttons you change the value. Pushing the OK button, you confirm the changes. After reaching the set temperature Ti, the chrothermostat controls the switching off of the generators, the following restart will take place only if the temperature falls under the set temperature decreased hysteresis (Ti-hysteresis). The default hysteresis is 0.1 º C The Language submenu on the "SETTING MENU" allows set the language of texts on the chronothermostat. PRELIMINARY 6/11
7 Example 2: Ti = 20,0ºC Max = 100% d = 0,9ºC hysteresis = 0,4ºC (hysteresis can vary between 0,1ºC e diff / 2 = 0,4ºC) When Ta 20ºC then P = 0, and the generators are turned off. A restart occurs if Ta (Ti hysteresis) = 19,6ºC; in particular if 19,1ºC < Ta 19,6ºC then P = ( 100 / 0,9 ) x ( 20 Ta ) %, while if Ta 19,1ºC then P = 100%. MANAGEMENT SYSTEM PARAMETERS MENU The submenu "PARAMETERS MENU" allows you to remotely manage the hot air generators. Pushing the and buttons, you scroll through the various items. As shown in the above page, in case of lock of a generator, it is possible to send a request for remote reset. Since this is a safety function, the unlocking of the generator can take place only with the consent of the safety logic control board. Selecting the third option you can operate on TSP (Transparent Slave Parameter). The first item, very important, allows you to view and set the parameters on the remote system. Pushing OK, you activate the first page of reading parameters. The chronothermostat makes available the function of reading and writing of TSP. To change a TSP, you must select the index "idx" desired, using the and keys, and push the SET button. After that following screen appears, where you can enter, with the + and - buttons, the desired value. To change a parameter, you must navigate to the settings page with keys and, and pushing the SET button you can enter with the + and - buttons the selected value between the minimum and maximum, shown in brackets. For information about the meaning of the parameters, please refer to the technical documentation of the control board of the hot air generators connected to the chronothermostat. The second item on the "PARAMETER MENU" allows you to use the unlock command. In the event, that the board does not include the writing of this TSP (read only) the changes made to it will have no effect. The number of TSP depends on the control board of the slave (hot air generator), the chronothermostat will support a maximum of 255. The fourth option, of the "MENU PARAMETERS", if available, allows you to enter the temperature Tset: PRELIMINARY 7/11
8 Refer to the documentation of the control board generator, to understand the meaning of Tset. The last two items of the "MENU PARAMETERS" are useful functions during installation and maintenance of the control system. The item "OT monitor" is dedicated to advanced diagnostics OpenTherm communication, as it makes visible the data exchanged between chrothermostat and control board and shows the analysis of the communication made from the chrothermostat (master side). In particular, next to the data shows the following symbols: correct data exchange 'T' RX timeout error 'R' RX error '?' generic error (unknow) 'P' parity error 'E' syntax error The function "Reconnection", serves to reconfigure the chrothermostat in the case has been made an intervention hardware or software in the control board of the generator. Activate the reconnection is equivalent to physically disconnect the communications connector from the chrothermostat and then reinsert it. PRELIMINARY 8/11
9 INTERNAL ENERGY STORE AND USE OF BATTERIES The chronothermostat is provided with an internal energy store which can compensate for a power cut-off for a few hours; in this way the user will not have to set the current time, room temperatures and week program again. However, the internal energy store consumption time varies depending on the room temperature and humidity, as well as on the ageing of components. In order for the internal energy store to be fully effective, the chronothermostat must have been correctly energized for a couple of days at least without interruption. If frequent and/or long cut-offs of the boiler power supply are expected, it is possible to avoid losing chronothermostat data by installing two alkaline batteries type AAA LR03 1,5V into the appropriate slot on the fixing base. In this way, the additional internal energy store, made by new batteries, enables to preserve data for a period even longer than one year under no power supply conditions. It is advisable not to keep batteries inside the chronothermostat for a long time during normal operation (power supply presence) to prevent any battery liquid leakage from damaging the chronothermostat itself. Finally, please note that Kronos GA11 does not provide any information about the presence of batteries or their charging status. WARNINGS ABOUT THE BACKLIGHT 1 FIGURE 3: Instruction for remove the cover Then is possible to wire the circuit board unit using the appropriate terminal, regardless of the polarity (the two conductors can be exchanged). It is recommended to use a twisted pair cable (example H03RR-F o H03VV-F) size between 0,5 mm 2 and 2,5 mm 2, the length should not exceed 50m. The resistance of each conductor, in any case, should not exceed 5 Ω. In environments with electromagnetic interference it is recommended to use a shielded twisted pair cable. 2 The display backlight is obtained from the reserve described in the previous paragraph. It is possible, therefore, that in case of newly connected chronothermostat the brightness is minimal or absent because of insufficient internal charge: this must not alarm as they are just a few hours of connection, because the backlight to begin to be efficient. You can, if desired, to remedy this temporary lack of backlighting installing alkaline batteries, making sure the polarity and following the instructions in the previous paragraph. INSTALLATION INSTRUCTIONS Respect National and European standards (EN /pr EN50165) regarding electrical safety. Before turning on, check the cables, incorrect wiring may damage the devices and compromise safety. Connect and disconnect the control system only in the absence of voltage. Avoid exposing the system to dripping water. INSTALLING THE CHROTHERMOSTAT ON THE WALL First step, remove the cover containing the electronic board by pushing the appropriate button trapezoid, that says "PUSH", located on the lower unit and rotating the cover itself up, until it is fully removed, as shown in figure 3. For the fixing on the wall is possible to use many holes provided on the bottom of the base, in this case, see Figure 4. PRELIMINARY 9/11
10 DIMENSIONS FIXINGS 9,00 10,40 9,50 9,50 5,00 2,20 5,00 ø 3,80 18,25 17,15 Figure 4: fixing holes of the base, back view NOTE Kronos GA11 is available in white, shown on page 1, or black, as the image. BRAHMA S.p.A. Via del Pontiere, Legnago (VR) Tel Telefax /25/03 Subject to amendments without notice PRELIMINARY 10/11
11 90,0 1,2 140,0 30,8 Figure 5: external dimension ATTENTION -> Company Brahma S.p.A. takes no responsibility for any damage resulting from Customer tampering with the device PRELIMINARY 11/11
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