`Building` Thermostat
Contents
1. 1 and 0 depending on the cycle time PI Cycle and according to the aforementioned opening level which will determine the proportion between the time the object has a value of 1 and the time it has a value of 0 e PI Cycle sets every how much time 1 to 250 minutes the required opening level of the valve or in the case of the PWM modulation the proportion between 1 and O will be re calculated e Control Parameters defines the desired values for the K and T parameters for the PI algorithm It is highly encouraged to make use of the pre set values Warm Water Floor Heating Electric Heating Blow Convector or A C Split see ANNEX Pre set Values for the PI Control however it is possible to specify custom values Advanced Selecting the latter brings the following parameters o Proportional Band defines the value for K between 1 C and 15 C o Integral Time sets a value for T between 5 and 255 minutes o Restart Accumulated Error on Saturation activates or deactivates this function during the algorithm application see section 2 3 2 e Re Sending Period sets every how much time between O and 255 minutes the control variable i e the Tx Control Variable Heating object will be sent to the bus A value of 0 disables the sending 2 Additional Heating enables or disables the Additional Heating function see section 2 4 When2. O during the remaining 75 of the cycle time Therefore an on off valve will stay entirely open 25 of the time and entirely closed 75 of the time PI Cycle Time Average value 25 v On the other hand under situations of control signal saturation during which the variable becomes 100 due to drastic differences between the setpoint and the reference temperature a significant integral error will accumulate as time passes so once the setpoint is reached the system will still send a positive signal because of the influence of the system history in the PI algorithm This will cause an excessive heat cool supply which will take some time to be compensated To prevent these situations the advanced configuration of the Building thermostat offers an option to reset the accumulated error as soon as the setpoint is reached after signal saturation http www zennio com Technical Support http zennioenglish zendesk com 8 Zennio Building Thermostat The following figure shows the effect on the ambient temperature depending on whether the reset of the accumulated integral error is enabled or not Figure 2 Effect of Resetting the Accumulated Integral Error after Signal Saturation 2 4 ADDITIONAL COOLING HEATING The Building thermostat from Zennio is capable of controlling secondary heat cool sources air conditioning devices heat pumps etc in case they are available This way it is possible to perform a
3. Zennio Passion for KNX innovation Building Thermostat Advanced Thermostatic Control Module lt gt zZ lt gt oc LL 09 User Manual Version b www zennio com Zennio Building Thermostat Contents De NC ea eects cer triere cee E N eects cetera ze 3 1 1 Building Thermostat from ZeNnnio cccsscccsscccsscecscecencecenceseuceseucessuceseucessucesseseneues 3 ems 2 0 E e214 A pee ene ene ene ee eee A ee 4 2 1 TOMPOT UT A AAA eee 4 2 2 WORN MOE R 5 2 3 A nantes voune nbarrtarva sare sare sinaie abaravcaia siesiewiane inate neuroencinstsiewauenaanes 5 2 3 1 TWO POINE Hysteresis CONTROL nr a 5 2 3 2 Proportionalintee tall asustes asiaticos 7 2A Additional Coon Heat sanciona oie 9 2 5 Special Modis uni 11 2 5 1 Absolute Setpoint muii 13 2 5 2 POVON EE 15 2 5 3 SMtenme tre special MOI nds 17 3 ES Patameten Sao is 19 3 1 Default Configuration ccceecccsscccesccceececencesenceseuceseuceseuceseuceseuceseceseeseseesesgeeesaaeees 19 3 1 1 TERNO EA Taiana cae 19 3 1 2 o it 21 3 1 3 o nn AP aa 27 3 1 4 COONDE koe e 30 ANNEX Pre set Values Tor Cie CONE ON aa 31 http www zennio com Technical Support http zennioenglish zendesk com 2 Zennio Building Thermostat 1 INTRODUCTION 1 1 BUILDING THERMOSTAT FROM ZENNIO A variety of Zennio products such as QUAD ACTinBOX Classic Hybrid Touch MyDesign or the 241 ZAS and Z38i touchscreens feature
4. sets the start up state of the thermostat after a power failure or an ETS download Off On or Last Last will be considered as Off on the very first start up after a download gt Automatic On when a new special mode arrives enabling this option will make the thermostat automatically switch on if off whenever a mode order is received even if it does not imply switching the current special mode of the thermostat or if the object is not changing the value it already had through Tx Special Mode one byte or Tx Special Mode mode name one bit as well as when receiving a 1 through the Tx Window Status input or the Tx Comfort Prolongation objects 2 Sending Statuses on Bus Voltage Recovery sets whether the device should send the KNX bus the thermostat state objects after the start up Sending their updated value is also possible under a certain delay 0 255 seconds defined through Sending Delay Sending Statuses on BUS voltage recovery Yes Sending Delay 13 0 Figure 7 Sending the Status 3 1 2 SETPOINT TAB This window contains all the parameters related to the setpoint temperatures of the special modes and to the desired control type for them absolute or relative Reading section 2 5 is encouraged as it describes the implications of this configuration With Independence of how this screen is configured the Tx Special M
5. C Setpoint 23 C Heating Mode as soon as the reference temperature is found to be lower or equal than T being T2 the setpoint temperature minus the Additional Heat band the auxiliary heat system will come into operation to provide a more effective heating Then it will switch off once the reference temperature is greater or equal than T gt 0 5 C Example Additional Heating Suppose a setpoint of 23 C and an Additional Heat band of 2 C In such case the additional heating will interrupt at 21 5 C 23 C Setpoint 23 C 21 5 C 21 C Additional Heat band 23 C 2 C 18 C Add Hea Additional Heat OFF ON http www zennio com Technical Support http zennioenglish zendesk com 10 Zennio Building Thermostat 2 5 SPECIAL MODES With Independence of the active working mode Cooling Heating the Building thermostat incorporates a set of special modes Comfort Standby Economy and Protection Each of these modes is associated to a particular pair of setpoint temperatures one for Cooling and one for Heating pre set by parameter although changeable in runtime so when the requirements change it is possible to adjust the climate system by simply activating the corresponding special mode 2 Comfort Mode this mode aims at performing the usual climate control i e while there are people present in the room Therefore the setpoint should have an adequate value to guarantee their comfort
6. Cool Base Reference Heat l Comfort Heat Standby Heat Standby Heat Economy Heat Economy Heat In this case an object is provided to modify the value of the base reference with respect to which the different offset values are applied As already stated two more objects are offered to increase decrease in runtime the value of the current offset which will be in any case subject to an upper limit maximum offset and a lower limit minimum offset both parameterisable To sum up the current setpoint of the thermostat can be obtained as http www zennio com Technical Support http zennioenglish zendesk com 15 Zennio Building Thermostat Setpoint Base Temp Mode Offset parameter User Offset object Finally it is possible to parameterize the desired initial special mode to be applied after an ETS download Moreover another parameter Permanently Apply Change to Basic Setpoint Shift is available to let the integrator select whether after switching to a new special mode the currently offset value should still apply being therefore added to the setpoint corresponding to the new mode or be re set to zero See the example below Example Relative Setpoints and Offset Storage Assume the following configuration e Base Temperature 22 C 2 Cooling Mode gt Offset for Comfort 1 C gt Offset for Standby 3 C gt Offset for Economy 5 C e Heating Mode gt
7. a functional module implementing a thermostatic control which make them capable of monitoring a set of indicators and depending on both the configuration and the temperature setpoint or target temperature required at a time send the KNX bus the appropriate orders for the interfaces that interact with the climate systems so that the setpoint temperature can be reached Zennio devices may feature one of the following two Home Thermostat 2 Building Thermostat To verify the model of the thermostat Home or Building incorporated in the application program of a particular Zennio device please refer to its specific user manual Also note that older versions of a certain application program may include a thermostat model different from that included in newer versions Note hereafter this manual will focus on the Building thermostat For specific information about the Home thermostat please refer to its corresponding user manual available at the http Mwww zennio com website http www zennio com Technical Support http zennioenglish zendesk com 3 Zennio Building Thermostat 2 CONFIGURATION 2 1 TEMPERATURE Prior to describing the thermostatic control procedure it is important to clarify the following two basic concepts 2 Setpoint Temperature this is the target temperature to be reached in the room according to the user requirements Although initially se
8. e Standby Mode this mode aims at relatively short periods during which the room will remain empty For example it is possible to think of the staff leaving a room due to a meeting in the adjacent one after which they will come back In such case it is possible to slightly relax the setpoint value to reduce consumption e Economy Mode aiming at longer periods with no presence in the room being controlled For example when the day ends and the occupants of the room leave it till the next morning Under these circumstances a relaxed enough setpoint would rather reduce the power consumption Protection Mode this mode is typically reserved for abnormal situations where external factors are conditioning the room climate control repair works on the building a broken window or even any circumstance because of which the room is going to stay empty for a very long time In such case a considerably low Heating mode or considerably high Cooling mode setpoint can be established so that the climate system remains normally off unless extreme temperature values are actually reached Note that the thermostat will necessarily stay at one of the above special modes every time When switching from one mode to another the setpoint temperature will automatically change to that of the selected mode Although the integrator is free to configure any desired setpoint for each special mode assuring an efficient configuration is highly encou
9. enabled the Tx Additional Heat one bit object will be available as well as the parameters Additional Heating Band which takes values between 100 and 5 tenths of a degree and Resending Period which takes values between 0 and 255 minutes Additional Heating Yes Additional Heating Band x 0 1 25 Resending Period 0 s Tmin 0 Disabled x Figure 14 Additional Heating http www zennio com Technical Support http zennioenglish zendesk com 29 _ Zennio Building Thermostat _ 3 1 4 COOLING TAB The Heating tab offers the integrator the option to set the algorithm and all the parameters involved in the Heating working mode of the thermostat It is important to understand the concepts explained in sections 2 1 2 2 and 2 3 of this user manual as they determine the utility of the parameters included in this window GENERAL Cooling lt THERMOSTAT gt gt Thermostat 1 Setpoint Heating Control Method point Control ka Control Variables Independent objects for heating and cooling r Lower Hysteresis x 0 7 10 Upper Hysteresis x 0 1 C 10 Resending Period 0 s 1min O Disabled Additional Cooling No Figure 15 Cooling The parameters in this tab and all the communication objects involved are analogous to those of the Heating mode see section 3 1 3 In this case the PI control is provided with the following pre set options for the contr
10. if periodic sending is specifically parameterised Note this parameter may not be available in older application programs 2 Reference Temperature determines the source of the reference temperature This may be the value of a sole communication object or a combination in a configurable proportion of the values of two communication objects These objects should in any case be linked to those providing the temperature measurements e g the object of the internal probe See 2 1 Reference Temperature Tem CEE Source Thermostat always OM Proportion F541 lt 3 2 Proportion 50211 501 21 Proportion 25 11 E lt 2 Startup setting on Bus voltage recover Temperature Source 2 Figure 5 Reference Temperature e Thermostat Always On sets whether the thermostat should run any time Yes or on the contrary whether it should be possible to turn it on off externally No Thermostat always ON No T Start up setting on Bus voltage recovery Last before Bus failure T Automatic ON when a new special mode o ee Disabled nal Figure 6 Thermostat Always On http www zennio com Technical Support http zennioenglish zendesk com 20 Zennio Building Thermostat In the second case two new binary communication objects Tx On Off and T x On Off status will show in ETS as well as the following parameters gt Start up Setting on bus voltage recovery
11. tabs one per mode Heating and Cooling will show in the tab list on the left Sections 3 1 3 and 3 1 4 cover the all necessary details to parameterise them In case of selecting both modes additional parameters will be displayed gt H C Automatic Switching grants or not the thermostat the responsibility of automatically switching from one mode to the other one Heating Cooling by http www zennio com Technical Support http zennioenglish zendesk com 19 Zennio Building Thermostat comparing the reference and setpoint temperatures If automatic switching is not enabled a communication object named Tx Mode will be in charge of receiving external mode switch orders 0 will switch to Cooling while 1 will switch to Heating With independence of the configuration of this parameter the current mode may always be verified by reading the value of the T Mode Status object 0 for Cooling and 1 for Heating gt H C Mode after Programming sets whether the thermostat should start up in the Heating mode or in the Cooling mode right after an ETS download gt Send both H C control signals periodically sets whether to send always the control signals of both the Heating and the Cooling modes and if enabled the Additional Heat and Additional Cool objects see sections 3 1 3 and 3 1 4 or whether to send only the variable of the currently active mode This only applies
12. the period defined under Comfort Prolongation Time 10 to 255 minutes ends Note that receiving the value 1 multiple times will reset the time count successively Note if the value 1 is received through the Tx Window Status input object while the Comfort Prolongation time is counting the thermostat will trigger the Protection mode until this object acquires the value O again after which the thermostat will in any case consider the Comfort Prolongation time as expired and will therefore adopt the corresponding special mode Comfort Prolongation Enabled Comfort prolongation time x 1 mir 30 Figure 10 Comfort Prolongation 2 Window Status enables or disables this function see section 2 5 3 as well as the associated communication object Tx Window Status input http www zennio com Technical Support http zennioenglish zendesk com 24 Zennio Building Thermostat 3 1 2 2 RELATIVE SETPOINTS GENERAL Setpoint lt THERMOSTATS gt gt Thermostat 1 l QQ E E E E l Setpoint Setpoint Working mode see user manual Relative setpoints T Heating Basic setpoint after programming T x 1 C Initial mode after programming Economy T Permanent apply change to basic setpoint shift lai Masimun offset 5 ry 1 C x Minimum offset 5 z 1 C x Comfort Offset heating q 0 128 bd Standby Offset heatin
13. the special modes any time Whether the currently active mode is one or another can be requested to the device by reading the mode status objects while selecting a particular mode can be done by making use of four binary objects one per special mode or through a one byte object For their part the binary objects can behave in two ways Trigger activating one special mode requires sending the value 1 through the object corresponding to that mode Sending one 0 will have no effect Switch activating one special mode requires sending the value 1 through the object corresponding to that mode provided that there are no other mode objects with a higher priority and with value 1 at the same time therefore the value 0 completely deactivates a mode The priority order of the special modes is as follows Protection gt Comfort gt Standby gt Economy Two more functions are available in relation to mode switching 2 Comfort Prolongation permits by writing the value 1 to a specific one bit object switch to the Comfort special mode and remain under that mode for a parameterisable time This function may be particularly useful when combined with a motion detector such as model ZN1IO DETEC from Zennio so that as soon as subjects are detected inside a room being air conditioned under the Standby or Economy modes the Comfort mode turns on and remains active for a certain tim
14. AB The Heating tab offers the integrator the option to set the algorithm and all the parameters involved in the Heating working mode of the thermostat It is important to understand the concepts explained in sections 2 1 2 2 and 2 3 of this user manual as they determine the utility of the parameters included in this window GENERAL Heating lt lt THERMOSTAT gt gt Thermostat 1 Setpoint Control Method 2point Control 0 T l i Cooling Lower Hysteresis x 0 1 C 10 E Upper Hysteresis x 0 1 10 Resending Period 0 s 1min 0 Disabled x Additional Heating No hi Figure 12 Heating 2 Control Method selects the control algorithm to be applied The options are 2 Point Control and PI Control gt 2 Point Control Lower Hysteresis x 0 12C 10 Upper Hysteresis x 0 120 10 Resending Period 0 gt x 1min Q Disabled x http www zennio com Technical Support http zennioenglish zendesk com 21 Zennio Building Thermostat The control variable will be in this case a one bit object Tx Control Variable Heat will throw the value 1 when the thermostat considers that the room needs to be heated and the value 0 while the climate system can remain off The configurable parameters are e Lower Hysteresis defines the value of the lower hysteresis between 1 and 50 tenths of a degree e the lower limit of the margin band around the setpoint tem
15. Offset for Comfort 1 C gt Offset for Standby 3 C gt Offset for Economy 5 C 2 Maximum Offset value 3 C 2 Minimum Offset value 2 C The option to maintain the offset value after mode switch is enabled as well Therefore 1 Suppose the thermostat starts up under Standby Cooling and therefore with a setpoint of 22 C 3 C 0 C 25 C the value of the offset object is 0 C 2 An increase order is received through the binary control object making the current setpoint change to 25 5 C 3 After that the 2 byte offset control object receives the value 4 C which would raise the setpoint to 29 C However as the maximum offset set by parameter is 3 C the offset is truncated to 3 C so the setpoint stays at 28 C http www zennio com Technical Support http zennioenglish zendesk com 16 Zennio Building Thermostat 4 An order arrives now to activate the Comfort mode whose setpoint temperature is 23 C However since the offset storage option was activated those 23 C are added the 3 C of the currently active offset resulting into 26 C In case a new value for the base reference is received from the bus e g 25 C the accumulated offset will not be reset For instance if such order arrives after 4 then the setpoint will become 25 C 1 C 3 C 29 C 2 5 3 SWITCHING THE SPECIAL MODE The Building thermostat from Zennio will necessarily run under one of
16. arameterisation criteria Economy Cool Ecnonomy Cool Standby Cool Standby Cool Comfort Cool Comfort Heat Standby Heat Standby Heat Economy Heat la Economy Heat On another hand it is possible to set via the Permanently Apply Change to Special Mode Setpoint parameter whether setpoint change commands received in runtime through the setpoint communication objects should overwrite or not the initial setpoint e the one defined in ETS of the current special mode in case of being triggered again in the future In other words whether the setpoint defined in ETS should always apply when entering that particular special mode or whether the setpoint that was active before leaving that special mode should still be active in case of switching back to it http www zennio com Technical Support http zennioenglish zendesk com 13 Zennio Building Thermostat Notes 2 The updated setpoint temperature will only be stored if the new mode becomes active because of an explicit order through the corresponding object Permanent setpoint changes do not apply to automatic mode switching i e due to a value change in the setpoint object e In the Comfort mode setpoint temperatures lower if under Cooling or higher if under Heating that that defined by parameter will not be stored either This restriction guarantees that in the Comfort special mode the setpoint te
17. com Technical Support http zennioenglish zendesk com 4 emo Building Thermostat _ 2 2 WORKING MODES To begin with the integrator should configure which of the two main climate working modes Cooling Heating or Both will be available so that the thermostat can manage by sending the corresponding orders to the bus situations of hot weather cool weather or both respectively Moreover provided that both modes have been enabled switching between them can be done automatically or depend on the state of a certain binary communication object In the first case the thermostat itself will switch the working mode when required after comparing the current setpoint which may also depend on the currently active special mode see section 2 5 with the reference temperature which will determine the suitable working mode at each time In addition it is possible to set by parameter the initial mode of the thermostat Heating or Cooling 2 3 CONTROL METHODS Room thermostatic control consists in sending the proper orders to the climate system so the room ambient temperature reaches a certain setpoint and then remains stable around that value Different algorithms are possible to perform such temperature control Zennio thermostats let the integrator select one of the following two 2 Two point hysteresis control 2 Proportional Integral control PI 2 3 1 TWO POINT HYSTERESIS CONTROL Similar to the climate contr
18. de respectively for Cooling and Heating Important note fo ensure a proper automatic commutation between the Cooling and Heating modes the setpoint for Comfort Cooling needs to be greater than that for Comfort Heating and there must be at least a 2 C separation between both 2 Standby Offset Cooling Standby Offset Heating they set the initial setpoint temperature for the Standby mode respectively for Cooling and Heating which is here expressed as a certain increment or decrement between O and 100 tenths of a degree with respect to the value set for Comfort Example Standby Offset Suppose a setpoint temperature that has been configured to have an initial value of 23 C for Comfort Cooling and of 21 C for Comfort Heating In such case if a setpoint of 25 C is required for Standby Cooling and of 18 5 C for Standby Heating it will be necessary to set offset values of 20 tenths of a degree and of 25 tenths of a degree respectively e Economy Offset Cooling Economy Offset Heating they set the initial setpoint temperature for the Economy mode respectively for Cooling and Heating The configuration is analogous to that of the above parameter gt Freezing Protection Overheating Protection they set the initial setpoint temperature for the Protection mode respectively for Cooling and Heating The permitted range is 0 15 for Cooling and 30 45 for Heating e 1 bit Objects Working M
19. e http www zennio com Technical Support http zennioenglish zendesk com 17 Zennio Building Thermostat Note consecutively receiving the value 1 multiple times will make the thermostat restart the count of the elapsed time 2 Window Status brings or hides the Tx Window Status input binary object which aims at being linked to any external sensor that may report anomalous situations a window being opened building repair works etc which suggest relaxing temporarily the thermostatic control by switching to the Protection mode Thus when the value 1 is received through this object the thermostat will switch to Protection and will remain in that mode until the object becomes 0 again after which it will recover the state that was active prior to the window opening event taking then into account any mode changes if any that may have been received and ignored while the value was 1 Notes gt When the Protection mode has been activated by means of the usual mode change objects and not through the window object the thermostat does execute the following mode change order as soon as it arrives thus leaving the Protection mode gt If the window object gets activated when the current mode is already Protection deactivating the window object will not make the thermostat leave such mode unless switch orders had been received in the meanwhile gt If the window object g
20. e see user manual Disabled Comfort Prolongation Disabled Window Status Disabled Figure 8 Absolute Setpoints e Initial Setpoint after programming sets the desired setpoint temperature between 5 and 45 to be adopted by the thermostat initially i e after an ETS download This value will itself determine the special mode that will be assumed as active when the device starts up The value of the setpoint will be modifiable any time through the Tx Setpoint two byte object whose value will as well determine when the thermostat should switch the current mode Object Tx Setpoint Status can be read to obtain the current setpoint value Another one bit object Tx Setpoint Reset is provided so that when it receives the value 1 the current setpoint temperature will be reset to its original value as parameterized in ETS for the currently active special mode http www zennio com Technical Support http zennioenglish zendesk com 22 Zennio Building Thermostat gt Permanently Apply Change to Special Mode Setpoint enables or disables the option to store the current setpoint value when leaving each mode so that the same setpoint is recovered in case of switching back to the same mode See section 2 5 1 for more details 2 Comfort Setpoint Cooling Comfort Setpoint Heating sets the initial setpoint temperature between 5 C and 45 C for the Comfort mo
21. ections indicate a lack of comfort due to insufficient heating http www zennio com Technical Support http zennioenglish zendesk com 6 Zennio Building Thermostat 2 3 2 PROPORTIONAL INTEGRAL PI It is a lineal control algorithm based not only on the difference between the setpoint and the reference temperature but also on the history of the system In addition the control signals sent are not strict open close orders but intermediate orders which notably reduce the temperature oscillation and the non comfort sections of the previous algorithm making the ambient temperature become progressively stable around the setpoint 26 25 24 23 Figure 1 Proportional Integral This algorithm requires configuring three main parameters Proportional Constant K expressed in terms of degrees estimates an error value proportional to the difference between the setpoint and the reference temperature e Integral Time T expressed in minutes this constant depends on the thermal inertia of the climate system and makes it possible to adjust the approximation error depending on the elapsed time 2 PI Cycle Time also expressed in minutes this cycle time is taken into account for setting the temperature sampling frequency and therefore the update frequency of the control signal being sent Although the Zennio devices let expert users manually set custom values for the above parameters generally it is p
22. ets activated during the comfort prolongation time see section 2 5 3 then deactivating the window object will make the thermostat switch to the last mode that was active prior to the comfort prolongation http www zennio com Technical Support http zennioenglish zendesk com 18 Zennio Building Thermostat 3 ETS PARAMETERISATION 3 1 DEFAULT CONFIGURATION Depending on the Zennio device more than one thermostats may be available Enabling them is usually done please refer to the user manual of the device from the lt lt THERMOSTAT gt gt tab as shown in the next figure GENERAL lt lt THERMOSTAT gt gt lt lt THERMOSTAT gt gt Thermostat 1 Disabled Figure 3 Enabling the Thermostat Function Once enabled a new tab will show up in the menu on the left containing the configurable parameters of the Thermostat module 3 1 1 THERMOSTAT n TAB GENERAL Thermostat 1 lt lt THERMOSTATS gt gt Thermostat 1 Setpoint Thermostat Function Heating Heating Reference Temperature Temperature Source 1 ha Thermostat always OM No Startup setting on Bus voltage recovery Last before Bus failure ea areas aaealne e Disabled Sending Statuses on BUS voltage recovery Mo Figure 4 Thermostat 1 2 Thermostat Function defines the main working modes that will be available Heating Cooling or Heating and Cooling Depending on the selection one or two secondary
23. g A 0 1 C E Economy Offset heating 40 0 128 Freezing Protection Setpoint 7 1 C y 1 bit objects working mode see user manual Disabled Comfort Prolongation Disabled Window Status Disabled Y Figure 11 Relative Setpoints Through the Relative Setpoints method the integrator is required to set a base temperature value and a positive or negative offset for each special mode which determines the default setpoint temperature under every special mode The base temperature may be modified in runtime through Tx Basic Setpoint and also read through Tx Basic Setpoint Status It will be also possible to set an additional increment or decrement user offset in runtime See section 2 5 2 which leads to Setpoint Base Temp Mode Offset parameter User Offset object The user offset can be controlled alternatively through the following objects Tx Setpoint Step one bit object that lowers the temperature by 0 5 C when a 0 is received and raises it by 0 5 C when it receives a 1 Tx Setpoint Offset two byte object that lets the user set the exact value of the desired increment or decrement 2 Tx Offset Restart which on the reception of a 1 resets the setpoint to the default value corresponding to the current special mode i e to the value defined by parameter for that special mode In other words sets the user offse
24. lit 4 90 Table 3 PI Control Profiles for the Heating Mode Profile K T min Cooling Ceiling 5 240 Blow Convector 4 90 A C Split 4 90 Table 4 PI Control Profiles for the Cooling Mode These values have been obtained empirically and are therefore optimised for the most common climate control contexts Making use of them is highly encouraged leaving the manual configuration of these values for very specific situations and for specialists with experience in advanced climate control http www zennio com Technical Support http zennioenglish zendesk com 31 Zennto Passion for KNX innovation Join and send us your inquiries about Zennio devices http zennioenglish zendesk com Zennio Avance y Tecnolog a S L C R o Jarama 132 Nave P 8 11 45007 Toledo Spain Tel 34 925 232 002 Fax 34 925 337 310 jaiei KNX CE RoHS
25. mperatures of the Cooling and Heating modes do not overlap each other which would distort their meaning and sense Example Absolute Setpoints and Setpoint Storage Under similar parameter configuration as in the previous example suppose the permanent setpoint storage option enabled 2 Case 1 being the thermostat under Comfort Cooling the initial setpoint of 23 C gets manually increased by one degree 24 C and afterwards by three more degrees 27 C which causes an automatic switch to the Standby mode After that an order via the communication object is sent to go back to Comfort In this case the setpoint value will become 23 C as switching to the Standby mode was a decision of the thermostat itself not an external order 2 Case 2 being the thermostat under Standby Cooling the initial setpoint of 26 C gets lowered to 25 C due to an external order after which another order to commute to Comfort is received from the bus The setpoint therefore becomes 23 C In case a new order to switch back to Standby is received the setpoint will become 25 C again 2 Case 3 being the thermostat under Comfort Cooling the initial setpoint of 23 C gets lowered to 22 C due to an external order after which another order to commute to Economy Cooling is received from the bus The setpoint therefore becomes 28 C In case a new order requests the Comfort again the setpoint will change to 23 C as the current mode is Cooli
26. n even more effective thermostatic control by combining multiple climate systems for the same purpose which will report a higher comfort level As an example of this function think of a room where the primary climate system is a radiant floor system which is characterised for a high thermal inertia and for a moderately slow response after setpoint changes and a split air conditioner as a support system being the latter capable of a more agile response when a setpoint change occurs Configuring the Additional Cooling Heating function it is necessary to define a certain temperature range or band that will determine when the auxiliary system should come into operation Once defined the procedure is as follows 2 Cooling Mode as soon as the reference temperature is found to be greater or equal than T being T equal to the setpoint temperature plus the Additional Cool band the auxiliary cool system will come into operation to provide a more effective cooling Then it will switch off once the reference temperature is lower or equal than T 0 5 C http www zennio com Technical Support http zennioenglish zendesk com 9 Zennio Building Thermostat Example Additional Cooling Suppose a setpoint temperature of 23 C and an Additional Cool band of 2 C In such case the additional cooling will interrupt at 24 5 C Add Cool ON Additional Cool OFF 28 C 25 C Additional Cool ZAG band 23 C 2 C 23
27. ng and 22 C is higher than the 23 C defined by parameter Analogously in case the current mode was Comfort Heating no temperatures higher than 21 C will be stored either http www zennio com Technical Support http zennioenglish zendesk com 14 Zennio Building Thermostat 2 5 2 RELATIVE SETPOINTS This method which is intended for systems with greater complexity e g where a sole supervisor manages the setpoint of multiple thermostats permits controlling the target temperature in relative terms so that its value can be modified in runtime by means of increase decrease 1 bit orders each of which will add subtract 0 5 C to from the current value or by specifying the desired offset with respect to a certain reference Two communication objects one bit and two byte size respectively are provided for this On the other hand parameterising this type of control consists in e Defining a base reference for the temperature values e g 22 C 2 Defining the setpoint temperatures both for Cooling and for Heating of the Comfort Standby and Economy modes in terms of a certain offset with respect to the above base temperature e g 2 5 C 2 Defining the setpoint temperature both for Cooling and for Heating of the Protection mode in absolute terms e g 40 C The next diagram illustrates the above criteria Economy Cool Economy 500 Standby Cool Standby Cool Comfort Cool
28. ode and Tx Special Mode Status objects one byte size each will permit selecting the desired special mode and checking which of them is active respectively Value Corresponding Mode 1 Comfort 2 Standby 3 Economy 4 Protection Table 2 Special Modes vs Object Values http www zennio com Technical Support http zennioenglish zendesk com 21 Zennio Building Thermostat The first parameter is Setpoint Working Mode containing the options Absolute Setpoints and Relative Setpoints see section 2 5 for more details on their differences Depending on the selection the remaining parameters in the window will slightly differ The following sections of this document describe the different cases Note the figures shown next contain parameters related to both the Heating and the Cooling modes If only one of the two modes has been enabled see section 3 1 1 ETS will only show the parameters corresponding to that mode 3 1 2 1 ABSOLUTE SETPOINTS GENERAL Setpoint lt THERMOSTATS gt gt Thermostat 1 mMM A Setpoint working mode see user manual Absolute setpoints Heating Initial Setpoint after programming T 7 k 11C Permanent apply change to special y m mode setpoint ES Comfort Setpoint heating 57 z x 1 C Standby Offset heating A 0 1 C Economy Offset heating AQ z x 0 1 C Freezing Protection Setpoint 7 z x 120 1 bit objects working mod
29. ode enables or disables the special mode selection once bit objects and sets the desired response type These objects are Tx Special Mode Comfort Tx Special Mode Standby Tx Special Mode Economy and Tx Special Mode Protection http www zennio com Technical Support http zennioenglish zendesk com 23 Zennio Building Thermostat The response type can be Trigger or Switch as explained in section 2 5 3 In case of opting for Switch an additional parameter will show up Default Mode for the selection of the special mode to be adopted by the thermostat when all the binary objects have a value of 0 This option should not be confused with the selection of an initial mode for the thermostat which is determined by the value set under Initial Setpoint after programming as already described Note if this option is left disabled switching the special mode will only be possible through the Tx Special Mode one byte object 1 bit objects working mode see User manual Default mode Disabled Figure 9 1 bit Objects for the Mode Selection 2 Comfort Prolongation enables or disables the Comfort Prolongation function see section 2 5 3 and shows hides the Tx Comfort Prolongation one bit communication object which will make the thermostat on the reception of the value 1 switch to the Comfort mode leaving it afterwards once
30. ol parameters Cooling Ceiling Blow Convector and A C Split see ANNEX Pre set Values for the PI Control apart from the Advanced option which lets the integrator enter custom values for K and T In the particular case of having both the Heating and the Cooling modes enabled the Heating tab will also include the following parameter 2 Control Variables sets whether to send the control orders through the same communication object both under the Cooling and the Heating modes One Object for both Heating and Cooling or whether to send the Heating orders and the Cooling orders through separate objects Independent Objects for Heating and Cooling which is de option selected by default Note if One Object for both Heating and Cooling is combined with Send Both H C Control Signals Periodically see section 3 1 1 the latter will be ignored the thermostat will only send the value of the control variable of the current mode http www zennio com Technical Support http zennioenglish zendesk com 30 Zennio Building Thermostat ANNEX PRE SET VALUES FOR THE PI CONTROL The tables below show the different profiles for the Pl Control that have been pre set in the Building thermostat from Zennio and the corresponding values of the K and T parameters Profile K T min Warm Water 5 150 Floor Heating 5 240 Electric Heating 4 100 Blow Convector 4 90 A C Sp
31. ol performed by conventional thermostats this algorithm requires not only a temperature setpoint but also a pair of hysteresis values i e a lower and an upper limits so a certain margin band is defined around the temperature setpoint which prevents the thermostat from continuously switching from one mode to the other when the ambient temperature reaches the setpoint http www zennio com Technical Support http zennioenglish zendesk com 5 Zennio Building Thermostat Example wo Point Hysteresis Let an initial temperature of 25 C be parameterised with an upper hysteresis of 1 C under the Heating mode and also assume that the ambient temperature is 19 C so the system will start heating the room Once the temperature is 25 C it will continue heating until it becomes 26 C which is the upper limit of the hysteresis band The climate system will then shut down and will remain off until the ambient temperature is lower than 24 C not 25 C after which it will turn on again This algorithm throws a very particular temperature graph The main disadvantage of this algorithm when compared to other advanced systems is the permanent fluctuation around the setpoint temperature which has a direct impact on the power consumption and on the comfort The Red colour sections correspond to periods of unnecessary power consumption and of lack of comfort due to excessive heat On the contrary the blue colour s
32. perature e Upper Hysteresis sets the value of the upper hysteresis between 1 and 50 tenths of a degree i e the upper limit of the margin band around the setpoint temperature e Resending period sets every how much time 0 to 255 minutes the control variable i e the Tx Control Variable Heat object will be sent to the bus A value of 0 disables the sending gt PI Control Control Method PI Conte ti Control Type Continuous 1 byte st Pl Cycle 1min 15 Control Parameters warm Water BK 150min Rezending Period q fe 1min O Disabled Figure 13 PI Control The control variable Tx Control Variable Heat in this case may be either a one byte or a one bit object depending on the configuration of the Control Type parameter as explained below The configurable parameters are e Control Type sets whether the climate system valve should be controlled through precise positioning Continuous 1 byte or through on off orders PWM 1 bit In the first case the control variable will be a one byte object and will reflect as a percentage the opening level required in the valve 100 entirely open 0 entirely closed In the second case on http www zennio com Technical Support http zennioenglish zendesk com 28 Zennio Building Thermostat the contrary the variable will be a one bit object that will successively commute between
33. raged To begin with it is important to ensure that the Standby setpoints fall down between the Comfort and the Economy setpoints http www zennio com Technical Support http zennioenglish zendesk com 11 _ Zenmnio Bilin Thermostat _ The setpoint temperature is subject to be changed anytime although it will be possible to reset the initial value i e the one set by parameter by means of a specific communication object Note on the other hand that whenever a new setpoint value is set in runtime the thermostat may automatically switch to the special mode that best fits the new value Example Special Modes Under the following configuration 2 Cooling Mode gt Comfort Setpoint 23 C gt Standby Setpoint 3 C with respect to the Comfort setpoint gt Economy Setpoint 5 C with respect to the Comfort setpoint Heating Mode gt Comfort Setpoint 21 C gt Standby Setpoint 3 C with respect to the Comfort setpoint gt Economy Setpoint 5 C with respect to the Comfort setpoint Being under the Heating mode and the Comfort special mode a new setpoint of 18 C is manually set via communication object The thermostat will then switch automatically to the Standby mode After that if the setpoint gets set at 16 C the Economy special mode will be triggered automatically Finally if an order to activate the Comfort mode arrives via object then the setpoint will change to 21 C The behaviour wo
34. referable to make use of one of the pre set options which should fit the most common climate situations see ANNEX Pre set Values for the Pl Control Regarding the control signals of the PI mode they can be expressed in two forms http www zennio com Technical Support http zennioenglish zendesk com gt Zennio Building Thermostat Continuous Pl the control variable will throw percentage values thus indicating how much the valve that regulates the gate or grille of the climate system should open For instance a value of 50 will indicate that the gate must remain half open Of course this method only applies to advanced systems where the valves permit intermediate positioning 2 PWM Pulse Width Modulation the control variable will be in this case binary being therefore possible to control on off valves e valves not permitting intermediate positions Partial opening of the valve for example at 50 is therefore emulated by successively opening closing it entirely for brief time portions Example Pulse Width Modulation PI Let a continuous PI thermostat control system determine a control variable of 25 which would be interpreted by partial positioning valves as an order to open the gate to 25 of their travel limit The equivalent PWM variable for that would be a binary signal that remains at high level value 1 for 25 of the configured PI cycle time and at low level value
35. t by parameter the setpoint temperature may vary at the users request depending on their needs each time gt Reference Temperature this is the actual ambient temperature registered in the room at a certain time and is typically provided by an external KNX device with temperature measurement capabilities It is also possible to make use of the combination of two different temperatures which may be obtained by separate sensors one of which can be the internal temperature sensor available on some of the Zennio devices that include the thermostat function The Building thermostat offers the possibility of combining the two in the following proportions Proportion Source 1 Source 2 1 15 25 2 50 50 3 25 15 Table 1 Combining Reference Temperatures Of course it is necessary to group under the same address the Tx Temperature Source object together with the external object that provides the temperature measurements or if desired with the object of the internal temperature probe of the device itself When configured the Building thermostat can take care of automatically switching between the two main climate modes Cooling and Heating by comparing the setpoint and the reference temperatures Should the setpoint be greater than the reference it will switch to the Heating mode on the contrary it will switch to the Cooling mode if the setpoint is lower than the reference temperature http www zennio
36. t to 0 http www zennio com Technical Support http zennioenglish zendesk com 25 Zennio Building Thermostat On the other hand objects Tx Setpoint Status and Tx Setpoint Offset Status make it possible to send the thermostat a request of the current values of the tota setpoint and of the user offset respectively This tab offers the following configurable parameters gt Basic Setpoint after programming sets the initial value of the base temperature which will be considered as a reference for the definition of the setpoint of the various special modes which are parameterised in terms of a certain offset with respect to this base temperature See section 2 5 2 for further details As already stated this base value can be modified later through Tx Basic Setpoint and read through Tx Basic Setpoint Status two byte objects both e Initial Mode After Programming sets the special mode that will be initially active in the thermostat Comfort Standby or Economy default gt Permanently Apply Change to Basic Setpoint Shift allows enabling or disabling the option to store the user offset when the thermostat leaves the current special mode so in case the user had altered the setpoint by a certain value x with respect to the setpoint of that mode the target special mode will also shift its own setpoint by x with respect to its parameterised val
37. ue 2 Maximum Offset maximum total increment i e upper limit permitted for the setpoint with respect to the base temperature See example Relative Setpoints and Offset Storage in section 2 5 2 Minimum Offset maximum total decrement i e lower limit permitted for the setpoint with respect to the base temperature Analogous to the previous one 2 Comfort Offset Cooling Comfort Offset Heating sets the setpoint temperature corresponding to the Comfort mode respectively for Cooling and Heating expressed as an offset upwards or downwards with respect to the base temperature The supported range is O 100 tenths of a degree gt Standby Offset Cooling Standby Offset Heating analogous to the previous parameter but for the Standby mode http www zennio com Technical Support http zennioenglish zendesk com 26 Zennio Building Thermostat gt Economy Offset Cooling Economy Offset Heating analogous to the previous parameter but for the Economy mode e Freezing Protection Overheating Protection sets the setpoint temperature in absolute terms between 0 C and 15 C for Cooling and between 30 C and 45 C for Heating for the Protection mode The following parameters are entirely analogous to those already explained for the Absolute Setpoints method section 3 1 2 1 e 1 bit Objects Working Mode 2 Comfort Prolongation 2 Window Status 3 1 3 HEATING T
38. uld be analogous in case of progressively increasing the setpoint temperature Depending on the reference temperature the thermostat may commute from Heating to Cooling at some point during the above sequence In such case and depending on the parameterised setpoints for the special modes under the Cooling mode the actual behaviour may differ slightly The setpoint control can be performed according to the absolute setpoint or the relative setpoint methods http www zennio com Technical Support http zennioenglish zendesk com 12 Zennio Building Thermostat 2 5 1 ABSOLUTE SETPOINTS This method permits a direct control of the value of the desired temperature in absolute terms The value will be associated to a two byte communication object through which the desired setpoints will be received The setpoints of the different special modes are in this case configured as follows 2 The setpoint for Comfort both the one for Heating and the one for Cooling is defined in absolute terms e g 22 C e The setpoint for Standby and Economy both the ones for Heating and the ones for Cooling will be defined in tenths of a degree as an increment or offset with respect to that defined for Comfort For example 25 i e 2 5 C 2 The setpoint for Protection both the one for Heating and the one for Cooling will be defined in absolute terms e g 40 C The following diagram illustrates the setpoint p
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