Smile SDC heating and district heating controller SERVICE MANUAL EN2H-0221GE51 R0808
EN2H-0221GE51 R0808
SDC / DHC Contents Contents 1 Software version ..........................................................................................................11 2 Safety instructions.......................................................................................................11 2.1 Intended use .....................................................................................................11 2.2 Requirements for start-up.......................................................................
Contents SDC / DHC 5.1.2.9 Access to the technician / OEM area ......................................46 5.1.2.10 Heating curve ..........................................................................47 5.2 Menu-selection level..........................................................................................48 5.2.1 "Time - Date" menu ..............................................................................54 5.2.2 "Timeprograms" menu .....................................................
SDC / DHC Contents 5.4.7 "District hot water" menu (DIST.HEATING) ........................................104 5.4.8 "Return increase" menu (RETURN CONTR)......................................105 5.4.9 "Solar" menu (SOLAR) .......................................................................106 5.4.10 "Solid" menu (SOLID FUEL)...............................................................107 5.4.11 "Buffer" menu (BUFFER)....................................................................108 5.4.
Contents 7 SDC / DHC 6.8.8 System frost protection .......................................................................124 6.8.9 Pump forced operation .......................................................................127 Hydraulic Components..............................................................................................128 7.1 Heat generator: Boiler .....................................................................................128 7.1.
SDC / DHC Contents 7.2.7 Quick hot-water control.......................................................................152 7.2.8 Mode of operation of hot-water control mode "external operation" ...........................................................................................154 7.2.9 Conditional parallel operation for mixed heating circuits.....................155 7.2.10 Circulation pump control mode ...........................................................155 7.2.
Contents SDC / DHC 7.3.4.3 Heating circuit room controller ..............................................171 7.3.4.4 Switch-on/switch-off optimisation ..........................................171 7.3.4.5 Room setpoint ramp..............................................................175 7.3.4.6 Heating limit function.............................................................175 7.3.4.7 Heating circuit room frost protection limit ..............................177 7.3.4.
SDC / DHC Contents 7.3.12.1 General description of cascading of control devices .............232 7.3.12.2 Function of the cascade parameters .....................................233 7.3.12.3 Mode of operation of cascade control ...................................234 7.3.13 Commissioning, maintenance and troubleshooting help ....................237 7.3.13.1 Automatic set function...........................................................237 7.3.13.2 Emission measurement (not for DHC 43) ...................
Contents 10 SDC / DHC EN2H-0221GE51 R0808
SDC / DHC Software version 1 Software version This documentation is valid for software version V 3.0 of your control device. The software version is displayed after switch-on for approx. 8 s. If you are using an older software version, please contact your heating technician. 2 2.
Safety instructions SDC / DHC 2.2.1 Power supply Do not disconnect the controller from the mains supply! The battery for saving all individualised data is otherwise unnecessarily strained. The frost-protection function of the controller is deactivated. 2.2.2 Connection conditions All electrical connection work may only be carried out by qualified personnel! 2.2.3 Cable cross-sections 1.5 mm2 for all cables carrying 230 V (power supply, burner, pumps, actuator). 0.
SDC / DHC Safety instructions 2.2.6 Grounding and zeroing Local regulations on the connection of equipment must be observed! 2.3 Hot-water temperature greater than 60 °C ATTENTION Note that there is a danger of scalding at all hot-water drawoff points (kitchen, bathroom etc.) in the following cases. Add sufficient cold water in these cases.
Safety instructions SDC / DHC 2.4 Connection of accessory parts WARNING According to VDE 0730, a separator for each mains terminal is to be provided in the voltage supply to the control equipment. Observe the local regulations regarding grounding and zeroing. As soon as the mains voltage is applied to terminals 21, 22, 2, 6, 12 and 18, headers X3 and X4 can also carry mains voltage.
SDC / DHC Safety instructions 2.6 Safety precautions for EMC-compliant installation Mains lines and sensor/data bus lines must be installed separate from each other. A minimum of 2 cm space must be present between the lines. It is permissible to cross lines. x a ç é æ b y a Mains 230 V AC x 15 cm b Data bus line 12 V AC y 2 cm For control devices with their own mains connection, separate installation of mains and sensor/bus lines must absolutely be ensured.
Safety instructions SDC / DHC When installing control or wall devices, a minimum spacing of 40 cm to other electrical equipment with electromagnetic emissions, e.g. relays, motors, transformers, dimmers, microwave ovens and televisions, audio speakers, computers, cordless telephones etc., is to be ensured. ç é æ x x 40 cm A minimum spacing of 40 cm is to be ensured between wall devices and central devices. Multiple central devices in the data bus system can be mounted directly next to one another.
SDC / DHC Safety instructions The mains connection of the heating system (boiler – panel – control equipment) must be designed as a separate circuit. Neither fluorescent lamps nor any machines which are potential sources of interference may be connected/connectable.
Safety instructions SDC / DHC The earth connection of the cable shielding must occur on one side at the protective conductor connection, e.g. at the cladding plate of the heat generator, protective conductor terminal etc. Multiple earth connections of a single cable are not permissible (buzzing loop).
SDC / DHC Safety instructions With star-topology data bus systems, double earth connections may not be made. The earth connection must be made on one side of the star! a Shielding b Two-lead data bus line c Distributor terminal d Branch box The outside sensor may not be installed near transmitters or receivers (e.g. on garage walls near garage door opener receivers, amateur radio antennas, radio alarm systems or directly next to large transmission equipment etc.).
Overview SDC / DHC 3 Overview x SDC 3-40 3 – – – x – – – – SDC 7-21 1) 7 – x x x – x – – x x x – x x x SDC 9-21 2) 7 x + two variable relays x x x x x x x SDC 12-31 3) 10 x + two variable relays 20 1) DHC 43-1 2) DHC 43-2 3) DHC 43-3 Variable output 2 Variable output 1 – Tank loading pump Mixed heating circuit 2 – Variable output 3 x Direct heating circuit x Burner stage 1 – District heating valve CLOSED 3 or SDC 3-10 Type Burner stage 2 Mi
SDC / DHC Abbreviations 4 Abbreviations The following abbreviations are used in this documentation/in the display of the control device: RED Lowering operation BS 2 Buffer sensor 2 (bottom) OS Outside sensor BLP Buffer loading pump OS2 Outside sensor 2 RBP Return bypass pump FGS Flue gas sensor RP Return pump OT Outside temperature SD I Switching differential I BUS System data bus SD II Switching differential II OC1 Burner stage 1 operating hour TS counter Tank sensor OC2 Bur
Operation SDC / DHC 5 5.
SDC / DHC Operation 5.1.1 Display (basic display) 1 C 2 3 4 5 1 Day of the week / Date 4 Operating mode symbols 2 Time 5 Heat generator temperature 3 Active operating mode The illumination of the display is switched on by pressing any button or using the input button î and switches off automatically if no buttons are pressed for a longer period of time. During start-up of the unit and after a power failure, a segment test with automatic fault diagnosis is carried out.
Operation SDC / DHC 5.1.2 Operating elements 5.1.2.1 Input button (press / turn) ð By pressing once, you can: • Confirm input / values By pressing and holding (approx. 3 s), you can: • Switch to the menu-selection level • Move up one menu level By turning the input button î, you can: 5.1.2.
SDC / DHC Operation 5.1.2.3 ¦ "Night-time room temperature" button Sets the lowered room temperature in automatic mode between the heating cycles and in the ABSENT and RED. HEATING operating modes. In operating mode 1, the set value for all heating circuits is the same. In operating mode 2, the set value applies for the respective heating circuit. To set the operating mode, see 5.2.3.3 Operating mode, pg. 74. Setting ► Press ¦ button.
Operation SDC / DHC Setting range One-time hot-water circuit loading 5.1.2.5 5 °C (hot-water economy temperature) ... Maximum hot-water heater temperature limit (service setting) Pressing and holding (approx. 3 s) the § button brings you to the reload function, where the reload time can be set in minutes. With a reload time of 0 minutes, loading is started once and the hot-water tank is loaded to the daytime setpoint.
SDC / DHC Operation Overview of the operating modes Symbol Operating mode Display Setting ç ABSENT P1 (P2, P3)*, return date è PARTY P1 (P2, P3)*, party end time é AUTOMATIC P1 (P2, P3)* ê SUMMER ë HEATING ì RED.
Operation SDC / DHC The selected operating mode appears in plain text, whereby a marking at the bottom edge of the display points to the respective operating mode symbol at the same time. In operating mode 1, the set value for all heating circuits is the same. In operating mode 2, the set value applies for the respective heating circuit. To set the operating mode, see 5.2.3.3 Operating mode, pg. 74. Setting ► Press button. ► Select operating mode by turning the input button î.
SDC / DHC Operation Cancellation An active absence program can be cancelled in case of early return. ► Press button. ► Turn input button î and switch to automatic operation. The active absence program has been cancelled. Factory setting Setting range P1 as from activation P1 (P2, P3) / 0.5 to 24 h to the current time P1 (P2, P3) Program-controlled resumption of heating operation.
Operation SDC / DHC Cancellation An active party program can be cancelled early. ► Press button. ► Turn input button î and switch to automatic mode. The active party program has been cancelled. Factory setting Setting range P1 as from activation P1 (P2, P3) / 0.5 to 24 h to the current time P1 P1 (P2, P3) Program-controlled resumption of heating operation.
SDC / DHC Operation Disabling / enabling default program P2 to P3 Disabling C "System Parameters" menu, program parameter = P1. All heating circuits and the hot-water circuit solely refer to the default / individually programmed switching times in the program P1 parameter. Program P1 does not appear in the display in this operating mode (see 5.2.2 "Timeprograms" menu, pg. 55 and 5.2.3.2 Time program, pg. 73). Enabling C Display "System Parameters" menu, program parameter = P1 to P3 (see 5.2.
Operation SDC / DHC Enabling C Display "System Parameters" menu, program parameter = P1 to P3 (see 5.2.2.1 Selection of the control circuit, pg. 56 and 5.2.3.2 Time program, pg. 73). Manual summer operation appears in the basic display with the information SUMMER. If default programs P2 and P3 were enabled, the corresponding symbol, Â, Ã or Ä, is also displayed depending on the selected program. The symbols are only displayed with the time program P1 to P3 active. 5.1.2.5.
SDC / DHC Operation NOTE Display The RED. HEATING operating mode remains active until another operating mode is activated. Activated continuous lowering operation appears in the basic display with the information RED. HEATING. In standby mode, the entire system is switched off and protected from frost (all frost-protection functions active). C Hot-water production is disabled and protected from frost. At storage temperatures below 5 °C, a reload to up to 8 °C takes place.
Operation SDC / DHC 5.1.2.6.1 Holiday mode In holiday mode, the heating circuits can be switched off and protected from frost or operated based on the settings for the RED. HEATING operating mode for the duration of the holiday based on the presetting ("Direct circuit" or "Mixed heating circuit 1" / "Mixed heating circuit 2" menu, parameter 25 = holiday operating mode). Setting ► Press button. The menu-selection level Switching time programs / Holiday programs appears in the display.
SDC / DHC Operation Control during holidays Cancellation At outside temperatures below the frost-protection limit (see 5.2.3 "System Parameters" menu, pg. 72) the heating circuits are controlled as follows: • Without wall devices: Based on a lowered room temperature specification of 3 °C.
Operation SDC / DHC Operating overview Press Turn input button to the left button Average/current outside temperature value Turn input button to the right Program/operating mode direct heating circuit/pump status Outside temperature min. to max.
SDC / DHC Operation Setting time for automatic return If the ¤ button is pressed and held for approx. 3 s, the INFO TIME parameter appears. With this parameter, the time it takes for automatic return to the basic display can be specified. Setting range Factory setting 5.1.2.7.1 OFF No return. The last selected information display continuously remains in the basic display until the next change. 1 ... 10 min Automatic return from the information level after the specified time (in 0.
Operation SDC / DHC Information Display Condition Remarks Return temperature Setpoint/Actual value Return sensor connected and one of the functions for return increase is active Connection of return sensor to associated variable input 1 or 2, VI can no longer be called up Flow sensor of district heating valve VF1 Setpoint/Actual value With district heating controllers Return sensor of district heating valve VFB Setpoint/Actual value With district heating controllers External heat Disabled mo
SDC / DHC Operation Information Display Condition Mixed heating circuit 2 flow temperature Setpoint/Actual value Mixed heating circuit 2 specified Mixed heating circuit 2 return temperature Actual value Return temperature with return maximum limit Direct heating circuit room temperature Setpoint/Actual value Direct heating circuit specified Setpoint inquiry without room temperature sensing: Current room setpoint of direct heating circuit Mixed heating circuit 1 room temperature Setpoint/Actu
Operation SDC / DHC Information Display Condition Remarks Buffer tank temperature at top Setpoint/Actual value VO1/2 configured as buffer tank loading pump Connection of PF1 to associated variable input 1 or 2, VI can no longer be called up Buffer tank temperature at bottom Setpoint/Actual value VO1/2 configured as buffer tank loading pump Connection of PF2 to variable input VI1, VI2 or VI3 Solar collector flow temperature Actual value VO1/2 configured as Special sensor solar tank loading pu
SDC / DHC Information MC1 actuator operating status Operation Display Mixed heating circuit 2 operating status Condition Mixed heating circuit 1 specified Remarks Mixed heating circuit 1 opens, closes or does not move Mixed heating circuit 2 specified Heating program: Holiday, Absent Til, Party Til, Auto, Summer, Heating, Red.
Operation Information Function and status of direct heating circuit pump SDC / DHC Display Condition Outputs specified based on function Remarks Solar (SOP), circulation (CIR), electric heating rod (ELH), feeder (CHP), boiler circuit (KKP1, KKP2), fault message (SMA), return (RLP), buffer (PLP), solid fuel (FSP), heating circuit (HKP), constant (KP), timer (CLOCK) Function and status of variable output 1 Outputs specified Function and status of variable output 2 Outputs specified District heating
SDC / DHC Information Heat generator switch-ons stage 2 Operation Display Condition Multi-stage heat generator specified Remarks Information on the number of heat generator switch-ons (burner start-ups) of the second stage. Heat generator operating hours stage 2 Multi-stage heat generator specified Information on the number of heat generator operating hours of the second stage. Test temperature for measurement purposes KVT sensor connected and VI configured.
Operation SDC / DHC 5.1.2.8 5.1.2.8.1 "Manual mode" / "Emission measurement" button Manual mode If this button is pressed and held longer than 5 s in the basic display, the controller is switched to manual mode. In this operating mode, the required heat generator temperature is specified manually with the input button î according to the respective heating need. A controller set to manual mode has no effect in heat circuit expansion.
SDC / DHC Operation 5.1.2.8.2 Emission measurement (not with district heating controllers) ATTENTION Emission measurements may only be carried out by the chimney sweep. Pressing the button controls the heat generator for a duration of 20 min based on the set maximum temperature limit. The remaining time is displayed and counted down. With two-stage heat generators, both stages are in operation (measurement at nominal output).
Operation SDC / DHC 5.1.2.9 Access to the technician / OEM area Entering a technician or OEM code enables additional setting options in the parameter menu. The technician code is: 1234. For access to the OEM area, please ask your field-service contact partner. Procedure: ► Press the and buttons simultaneously. The first number of the 4-digit code flashes. ► Set the first code number by turning the input button. ► Press the input button. The second number flashes.
SDC / DHC Operation 5.1.2.10 Heating curve Determines the heating curve for the heating circuits. C The heating curve describes the relationship of the flow temperature change to the outside temperature change. With a larger heating surface, such as with floor heaters, the heating curve has a less extreme slope than with a smaller heating surface (e.g. radiators). The set value refers to the lowest outside temperature used for heat demand calculation.
Operation SDC / DHC Factory setting Direct heating circuit (HC) = 1,5 Mixed heating circuit 1 (MC-1) = 1 Mixed heating circuit 2 (MC-2) = 1 x y a 5.2 x Boiler / flow temperature [°C] y Outside temperature [°C] a Troom [°C] Menu-selection level The control device contains a menu-selection level that is structured differently, depending on the respective device version. Access ► Press and hold input button î for approx. 3 seconds.
EN2H-0221GE51 R0808 Service functions Configuration (heating circuits, control paths) Configuration Programming Reduced operation Heating system Heating curve slope Heating curve slope Direct heating circuit Mixed heating circuit 1/2 Central device address Heat generator test Data bus Relay test Outside sensor Direct heating circuit pump test Switching differential Cascading Sensor calibration Mixed heating circuit 1 bus authorisation Direct heating circuit bus authorisation Regulation
Service functions Configuration (heating circuits, control paths) Configuration Programming Sensor calibration Fault messages 1/2 Relay test Data bus Cascading Total flow control Buffer Solid fuel Solar Return increase District heating Heat generator Mixed heating circuit 1/2 Direct heating circuit Hot water System parameter Hydraulics Date Parameter Boiler start-up discharge stage II Connection delay stage II Mixed heating Direct heating circuit 1 room circuit room sensor senso
EN2H-0221GE51 R0808 Service functions Configuration (heating circuits, control paths) Configuration Programming Sensor calibration Fault messages 1/2 Relay test Data bus Cascading Total flow control Buffer Solid fuel Solar Return increase District heating Heat generator Mixed heating circuit 1/2 Direct heating circuit Hot water System parameter Hydraulics Date Parameter Fault message 20 Reset fault messages Modulation of Modulation of adjustment time Tn runtime Modulation of sampl
Service functions Configuration (heating circuits, control paths) Configuration Programming Sensor calibration Fault messages 1/2 Relay test Data bus Cascading Total flow control Buffer Solid fuel Solar Return increase District heating Heat generator Mixed heating circuit 1/2 Direct heating circuit Hot water System parameter Hydraulics Date Parameter OEM maximum limit 30 Full-load control 31 32 Selection SDC/DHC 33 Heating capacity limit 34 Hot-water capacity limit Param
EN2H-0221GE51 R0808 Service functions Configuration (heating circuits, control paths) Configuration Programming Sensor calibration Fault messages 1/2 Relay test Data bus Cascading Total flow control Buffer Solid fuel Solar Return increase District heating Heat generator Mixed heating circuit 1/2 Direct heating circuit Hot water System parameter Hydraulics Date Parameter Switch-on optimisation 41 User Offset valve Switch-on position of hotoptimisation water circuit precontrol Reset
Operation SDC / DHC 5.2.1 "Time - Date" menu The following current calendar values can be specified in this menu: NOTE • Time • Year • Day - Month • Time change mode (summer / winter time) All listed daytime values are set at the factory and generally do not need to be updated. An internal, pre-programmed calendar ensures automatic time change on the annually recurring summer / winter time switchover dates. If necessary, the automatic time change can be deactivated.
SDC / DHC Operation 5.2.2 "Timeprograms" menu Individualised switching time programs for heating and hot-water operation can be created in this menu. Here, the factory-set default programs P1 (and, if enabled, P2 and P3 as well) of each heating circuit and the hot-water circuit are overwritten by individualised switching times and temperature specifications.
Operation SDC / DHC 5.2.2.1 Selection of the control circuit After accessing the "Timeprograms" menu, the desired control circuits can be selected with the input button î in the following sequence: • Direct heating circuit (HC) • Mixed heating circuit 1 (MC-1) • Mixed heating circuit 2 (MC-2) • Hot-water circuit (DHW) ► Press input button î to access the selected circuit. 5.2.2.
SDC / DHC Operation 5.2.2.4 5.2.2.4.1 Programming switching times and cycle temperatures Switch-on time The switch-on time is the start of heating or, with enabled switchon optimisation, the start of assignment. After selecting the day of the week and the corresponding cycle, the respective switch-on time appears flashing and can be set with the input button î.
Operation SDC / DHC NOTE The switch-off time cannot be set higher than the switch-on time of a subsequent cycle. If the switch-on time is changed, the corresponding time bar display is adjusted to the right-hand side. If the switch-off time is made equal to the switch-on time, the corresponding cycle is deleted. A subsequent cycle is automatically shifted to the position of the deleted cycle upon acceptance.
SDC / DHC Operation Switching time programming (programs P2 and P3 disabled) Upon accessing the menu-selection level, the "Timeprograms" menu always appears first. Enabling of programs P2 and P3 in the "System Parameters" menu (see 5.2 Menu-selection level, pg. 48 ).
Operation SDC / DHC Default switching time program (P1) for heating and hot water Uniform, continuous heating and hot-water operation on all days of the week Default program P1 Heating circuit 60 Day Heating operation from to Heat generator heating circuit Mo to Su 6:00 22:00 Hot-water circuit Mo to Su 5:00 22:00 Mixed heating circuit 1 / 2 Mo to Su 6:00 22:00 EN2H-0221GE51 R0808
SDC / DHC Operation Switching time programming (program P2 and P3 enabled) Upon accessing the menu-selection level, the "Timeprograms" menu always appears first. Enabling of programs P2 and P3 in the "System Parameters" menu (see 5.2 Menu-selection level, pg. 48 ).
Operation SDC / DHC Default program P1 Heating circuit Day Heating operation from to Heat generator heating circuit Mo to Su 6:00 22:00 Hot-water circuit Mo to Su 5:00 22:00 Mixed heating circuit 1 / 2 Mo to Su 6:00 22:00 Day Heating operation Default program P2 Heating circuit Boiler heating circuit Hot-water circuit Mixed heating circuit 1 / 2 from to from to Mo to Th 6:00 8:00 16:00 22:00 Fr 6:00 8:00 13:00 22:00 Sa to Su 6:00 22:00 Mo to Th 5:00 8:00 15:30 22
SDC / DHC Operation 5.2.2.4.3.1 Copying switching time programs (days) Block programming enables the switching times and cycle temperatures of any day of the week to be copied 1 – To any days within the week (Mo, Tu, We, ..., Su) 2 – To all weekdays (Mo to Fr) 3 – To the weekend (Sa to Su) 4 – To the entire week (Mo to Su) Calling up the copy function (days) See flowcharts on pg. 65 Source day ► Press input button î to confirm the copy function.
Operation SDC / DHC 5.2.2.4.3.2 Copying switching time programs (heating circuits) Block programming also enables the copying of all switching times and temperature specifications of a heating circuit to another heating circuit. Calling up the copy function (heating circuits) See flowcharts on pg. 65 Source circuit ► Press input button î to confirm the copy function. ► Turn input button î to select the source circuit to be copied (HC, MC-1, MC-2, DHW).
SDC / DHC Operation Block programming The copy function enables a source day to be copied to any target days or to all days of the week (week programming). All cycles of the source day are copied. Individual heating cycles cannot be copied.
Operation SDC / DHC Copy day Select source day: Example: Monday Copy from Mo Mo ... Su Source day Select first target day: Example: Tuesday Copy to Mo Tu Copy day OK 1 target day or 1-7 (Mo ... Su) or 1-5 (Mo ... Fr) or 6-7 (Sa ...
SDC / DHC Operation Copying heating circuits NOTE Select copy function: HC Heating circuits cannot be copied to hot-water circuits since they have different cycle temperatures: If a heating circuit is selected as the source circuit, the hot-water circuit can no longer be called up as the target circuit. The hot-water circuit as the source circuit is also the target circuit.
Operation SDC / DHC 5.2.2.4.4 HC Direct heating circuit MC-1 Mixed heating circuit 1 MC-2 Mixed heating circuit 2 DHW Hot-water heating circuit 1) Program selection for source and target circuits are skipped if programs P2 and P3 are disabled in the "System Parameter" menu. Reloading default programs See flowchart on pg. 70 Individually created switching time program P1, P2 or P3 can be overwritten with the original default switching time program P1, P2 or P3.
SDC / DHC Operation ATTENTION With the setting value ALL, all heating circuits and the hotwater circuit are overwritten with their default switching times with regard to the selected program. When overwriting occurs, individually created switching time programs are permanently lost and must be recreated from scratch. Pressing the display.
Operation SDC / DHC Reloading default programs Switching time programs P2 and P3 disabled 70 HC Direct heating circuit MC-1 Mixed heating circuit 1 MC-2 Mixed heating circuit 2 DHW Hot-water heating circuit EN2H-0221GE51 R0808
SDC / DHC Operation Reloading default programs Switching time programs P2 and P3 enabled DHW EN2H-0221GE51 R0808 HC Direct heating circuit MC-1 Mixed heating circuit 1 MC-2 Mixed heating circuit 2 DHW Hot-water heating circuit 71
Operation SDC / DHC 5.2.3 "System Parameters" menu The system parameters refer to general limiting parameters and specification values within the heating system. Access Returning 5.2.3.1 See 5.2 Menu-selection level, pg. 48 Returning to the basic display takes place by pressing the button or automatically after the set information time (see 5.1.2.7 "System information" button, pg. 35). Language selection Several languages can be selected for all information that appears in the display.
SDC / DHC Operation 5.2.3.2 Time program This parameter specifies enabling of the switching time programs for program selection and for individualised switching time programming. In the state of delivery, only one switching time program is enabled. This achieves simplification of operation with a large portion of applications for which only one switching time program is used.
Operation SDC / DHC 5.2.3.3 Operating mode Two operating modes can be selected. They determine whether the operating mode, the daytime temperature and the night-time temperature apply for all heating circuits or can be specified individually for each heating circuit. Setting range Set values Factory setting 5.2.3.3.1 Setting 1, 2 1 The selected setting applies for all heating circuits together. 2 Each heating circuit can be assigned an individualised setting.
SDC / DHC Operation 5.2.3.3.2 Setting Individualised night-time room temperature for each heating circuit ► Press ¦ button. ► Select desired heating circuit (HC, MC-1 or MC-2) by turning C the input button î. ► Confirm selected circuit by pressing the input button î. ► Set flashing room temperature specification to the desired value by turning the input button î. ► Confirm set value by pressing the ¦ button. Alternative: Automatic acceptance of the value after the set information time (see 5.1.2.
Operation SDC / DHC Quick increase in outside temperature If the averaged outside temperature is below the set value and the current outside temperature is 2 K above the set value, heating operation is interrupted. Slow increase in outside temperature Deactivation is also initiated when the averaged and current outside temperature exceeds the set value. Undoing deactivation Deactivation is undone when the averaged and current outside temperature exceeds the set value by 1 K.
SDC / DHC Operation ATTENTION A reset should only be carried out if all individually entered values are to be replaced by the values specified at the factory. Setting ► When the PARAM. RESET display flashes, press the input button î. SET flashes in the display. ► Press and hold the input button î for 5 s. If a reset is carried out, the RESET OK confirmation appears briefly. Verification is then started with a call-up of the first parameter in the respective menu once again.
Operation SDC / DHC 5.2.4.1 Night-time hot-water temperature This parameter specifies the temperature in the hot-water generator between the operational-readiness times in automatic mode. Factory setting Setting range 40 °C 5 °C to set normal hot-water temperature value NOTE If a hot-water thermostat (see parameter 05 = transducer for hotwater circuit) is used to detect the hot-water temperature, this parameter is skipped. 5.2.4.
SDC / DHC Operation 5.2.5.1 Reduced operation During reduced operation, you can select between two operating modes. Factory setting Setting range Set values ECO ECO, RED RED (lowering operation) The heating circuit pump of the direct heating circuit continues functioning during reduced operation (see 5.2.3.2 Time program, pg. 73). The flow temperature is determined based on the lowered room temperature from the associated reduced heating curve. The set maximum temperature is not undershot.
Operation SDC / DHC 5.2.5.2 Heating system This parameter refers to the type of the heating system (floor, radiator or convector heating) and can be matched to the exponent of the respective heat distributor. Using its progressive characteristics, the set value determines the curve characteristics of the heating curve of the direct heating circuit and compensates for the losses in output in the low-temperature range with it.
SDC / DHC Operation Logical error messages Bus error messages 5.4 5.4.1 These error messages evaluate the control result to be expected. They appear depending on the type and allocation with fault code 50 to 60 and index 0, 1 or 2. These error messages refer to address faults such as double issuance or non-recognition of address settings on the data bus. They appear with fault code 70 and index 0 or 1, depending on the type and assignment.
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 03 Mixed heating circuit 1 output OFF No function 3 2 Direct heating circuit controlled by weather conditions 3 Mixed heating circuit controlled by weather conditions 6 Constant regulator 7 Fixed-value regulator 8 Return maintenance 30 Mixed heating circuit as continuous hot-water pre-regulator (district heating) 39 Hot-water pre-regulator (district heating) 04 Mixed heating circuit 2 output 0
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 06 Variable output 1 OFF No function OFF 4 Circulating pump 5 Electrical heating circuit 9 Bypass pump 10 Feeder pump 11 Boiler circuit pump 1 12 Boiler circuit pump 2 13 Group error message 15 Solar charging pump 16 Buffer charging pump 17 Solid fuel charging pump 18 Stratified tank charging pump (DHC) 19 Solar charging switchover 25 Cooling switchover 26 Primary pump 27 Hydrauli
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 08 Variable input 1 OFF 1 No function Outside sensor 2 OFF 2 Heat generator sensor 2 3 Tank sensor 2 4 Buffer sensor 2 5 Request contact 6 12 External error message input Return maximum limit of mixed heating circuit 1 Return maximum limit of mixed heating circuit 2 Return temperature sensor External heat generator cutoff External switching modem External information 13 Total flow sensor 14 Coll
SDC / DHC Operation Parameter Designation Setting range / Setting values 09 Variable input 2 For setting values, see parameter OFF 08; does not include setting value 16 (exhaust gas sensor), however 10 Variable input 3 For setting values, see parameter OFF 08; does not include setting value 16 (exhaust gas sensor), limit sensor of district heating VFB, however 11 Indirect return lifting via mixed heating circuit OFF, ON 5.4.
Operation Parameter SDC / DHC Designation Time Time program program Setting range / Setting values Factory setting P1 Only one switching time program enabled P1 P1 to P3 Three switching time programs enabled 1 Common adjustment for all heating circuits 2 Separate adjustment for the individual heating circuits Operating mode Operating mode Summe r Summer switchoff OFF, setting value of parameter 05 to 30°C 20 05 System frost protection OFF, –20°C to Setting value of summer parameter
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 11 Automatic exit time OFF No automatic exit 2 0,5 ...
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 21* Adjustment of the real time clock (RTC) –10 ... 10 s 0 23 Locking code for operating level OFF, 0000 ... 9999 OFF 25 Cooling switch-on temperature 2 ...
SDC / DHC Operation 5.4.3 "Hot-water circuit" menu (DHW) This menu contains all parameters required to program the hot-water circuit, except the switch time programs.
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 07 Hot-water circuit operating mode 1 Parallel operation 2 2 Priority operation 3 Conditional priority 4 Parallel operation based on weather conditions 5 Priority operation with intermediate heating 6 Priority isolating circuit 7 External operation 8 Conditional parallel operation for mixed heating circuit (DHC only) Tank discharge protection OFF No discharge protection ON Discharge protecti
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 12 Circulation pump switching time program AUTO Active hot-water circuit time program AUTO 1 P1, direct heating circuit 2 P2, direct heating circuit 3 P3, direct heating circuit 4 P1, mixed heating circuit 1 5 P2, mixed heating circuit 1 6 P3, mixed heating circuit 1 7 P1, mixed heating circuit 2 8 P2, mixed heating circuit 2 9 P3, mixed heating circuit 2 10 P1, hot-water circuit 11 P2, h
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 17 Behaviour of heat generator during follow-up time AUTO Setpoint at heat generator depending on demand AUTO OFF Heat generator off during follow-up time of solar charging pump 5.4.4 Setting "Direct heating circuit" menu (UNMIXED CIRC) This menu contains all parameters required to program the unmixed heating circuits, except the switching time programs.
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 03 Room connection (in conjunction with room sensor) OFF Display of heat generator temperature, room sensor off, operation active OFF 1 Display of room temperature, room sensor active, operation active 2 Display of room temperature, room sensor active, operation disabled 3 Display of room temperature, room sensor off, operation active 04 Room factor OFF OFF 10 ...
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 12 Minimum temperature limit 10°C to setting value of parameter 13 20 13 Maximum temperature limit Setting value of parameter 12 to Setting value of parameter 30 in "Heat generator" menu (OEM maximum limit) 75 14 Temperature –5 ... 20 K increase of heating circuit Direct heating circuit = 0 15 Extended pump over-run 0 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 46 Pre-heat time at 0°C 0 ... 30 h 1 47 Lowering ramp 0 ... 500 % 100 Heating circuit name Heating circuit name 00000 ... ZZZZZ – 5.4.5 Setting "Mixed heating circuit 1 / 2" (MIX.VALVE - 1 / MIX.VALVE - 2) menus These menus contain all parameters required to program the mixed heating circuit, except the switching time programs.
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 03 Room connection (in conjunction with room sensor) OFF Display of heat generator temperature, room sensor off, operation active OFF 1 Display of room temperature, room sensor active, operation active 2 Display of room temperature, room sensor active, operation disabled 3 Display of room temperature, room sensor off, operation active 04 Room factor OFF OFF 10 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 11 Constant temperature setpoint (only if output was set to constant regulator) 10 ... 95°C 20 12 Minimum temperature limit 10°C to setting value of parameter 13 20 13 Maximum temperature limit Setting value of parameter 12 to Setting value of parameter 30 in "Heat generator" menu (OEM maximum limit) 75 14 Temperature –5 ...
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 24 Room control Tn (SDW 30 only) 5 ... 240 min 35 25 Holiday operating mode STBY Standby STBY RED Lowering operation 26 Room setpoint ramp OFF, 0.5 ... 60 K/h OFF 28 Cooling temperature of mixed heating circuit OFF, 18 to 24 OFF 39 Spread of hotwater circuit preregulator 2 ... 20 K 5 40 Offset valve position of hotwater circuit preregulator 0 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting Heating circuit name Heating circuit name 00000 ... ZZZZZ – Setting * OEM 5.4.6 "Heat generator" menu (HEAT GENER. The parameters in this menu refer to the type of the respective heat generator and the associated specific control functions.
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 05 Limit mode minimum limit (not if parameter 01 = OFF) 1 Minimum limit based on request 1 2 Limited minimum limit 3 Unlimited minimum limit Sensor operating mode 1 Burner switch-off in case of defect 2 External burner switchoff 3 Burner enable in case of defect 06 1 07 Minimum burner runtime 0 ... 20 min 2 08 Burner switching differential I One stage: 2 ...
SDC / DHC Operation Parameter Designation 13 Lead time of boiler 0 ... 10 min circuit pump or parallel heat generator enable (only with appropriate configuration in the "Hydraulics" menu) 0 14 Follow-up time of 0 ... 60 min boiler circuit pump (only with appropriate configuration in the "Hydraulics" menu) 2 15 Follow-up time of 0 ...
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 19* Modulation of proportional range XP 0.1 ... 50 %/K 5 20* Modulation of sampling time Ts 1 ... 600 s 20 21* Modulation of adjustment time Tn 1 ... 600 s / °C 180 22* Modulation of runtime 5 ... 600 s 12 23* Modulation of start time 0 ... 900 s 60 24* Modulation of start power 0 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 29 Heat generator forced discharge OFF OFF 1 Discharge to process water tank 2 Discharge to heating circuits 3 Discharge to buffer tank 30* OEM maximum limit Setting value of parameter 03 to 130 °C 110 31* Full-load regulation OFF, 0.5 to 10 OFF 34 Power limit for heating 50 ... 100 % 100 35 Power limit for hot water 50 ...
Operation SDC / DHC * OEM 5.4.7 "District hot water" menu (DIST.HEATING) The parameters in this menu refer to the type of the respective district hot-water station and the associated specific control functions. Parameter Designation Setting range / Setting values Factory setting 01 Increase OFF, –10 to 50 K 0 02 Maximum limit of flow temperature setpoint 10 ... 130 °C 90 03* Minimum district heating valve stroke 0 ... 50 % 10 04 Secondary flow boost 0,1 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 11* Return limit of district heating valve 0 Temperature (parameters 12 through 15 are not displayed) 0 1 Volume flow and temperature (parameters 12 through 14 are not displayed) 2 Heat output and temperature (parameters 13 through 15 are not displayed) 12* Calibration of heat output 1 ... 9999 1 13* Calibration of volume flow 1 ... 9999 1 14* Maximum heat output 1 ...
Operation SDC / DHC 5.4.9 "Solar" menu (SOLAR) The parameters in this menu refer to special settings with regard to the solar applications. Enabling occurs only with corresponding activation in the "Hydraulics" menu. Parameter Designation Setting range / Setting values Factory setting 01 Switch-on differential (Setting value of parameter 02 + 3 K) to 30 K 10 02 Switch-off differential 2 K to (setting value of parameter 01 – 3 K) 5 03 Minimum runtime of solar charging pump 0 ...
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 10 Reset heat balance SET by pressing the input button – 11 Volume flow 0 ... 30 L/min or L/pulse 0 12 Density of medium 0.8 ... 1.2 kg/L 1.05 13 Heat capacity of medium 2 ... 5 KJ/kgK 3.6 14 Final switch-off temperature OFF, 90 to 210 °C 210 15 Test cycle of solar charging switchover 1 ... 60 min 10 16 Switchover temperature 20 ... 110 °C 75 5.4.
Operation SDC / DHC 5.4.11 "Buffer" menu (BUFFER) The parameters in this menu refer to special settings with regard to solids regulation. Enabling occurs only with corresponding activation in the "Hydraulics" menu.
SDC / DHC Operation Parameter Designation Setting range / Setting values Factory setting 10 Buffer operating mode 1 Heating circuit charge regulation and hot-water circuit 1 2 Heating circuit charge regulation without hot-water circuit 3 Heating circuit and hot-water circuit discharge regulation 4 Heating circuit discharge regulation without hot-water circuit 5 Charge regulation with hot-water circuit switchover 6 Discharge regulation for heat generator 11 Follow-up time of buffer char
Operation SDC / DHC 5.4.13 "Cascading" menu (CASCADE) The parameters in this menu refer solely to the parameters that are associated with the cascading of multiple heat generators. This selection is only available if multiple heat generators exist in the control system. Parameter Designation Setting range / Setting values Factory setting 01 Switching differential 0.5... 30 K 8 02 Connection delay 0 ... 200 min 0 03 Switch-off delay 0 ...
SDC / DHC Operation 5.4.14 "Data bus" menu (BUS) The parameters in this menu refer solely to the parameters that are associated with the data bus.
Operation SDC / DHC Parameter Designation Setting range / Setting values Factory setting 06 Mixer motor 2 test STOP-OPEN-CLOS STOP 07 Storage charging pump test OFF-ON-OFF OFF 08 Variable output 1 test OFF-ON-OFF OFF 09 Variable output 2 test OFF-ON-OFF OFF 10 System Display of sensor value by pressing the input button – 5.4.16 Setting "Error messages" menu (ALARM) Error messages that occur are displayed in this menu. The fault memory can hold max.
SDC / DHC Operation 5.4.17 "Error messages 2" menu (ALARM 2) Only in conjunction with heat generator interface Error messages triggered by an automatic stoker are displayed in this menu. The fault memory can hold max. 20 messages, which can be displayed individually. For this purpose, parameter 28 in the "System parameters" menu must be set to ON.
Control Functions SDC / DHC Parameter Designation Setting range / Setting values Factory setting 06 Collector flow sensor –5 ... +5 K 0 07 Buffer sensor of collector –5 ... +5 K 0 08 Sensor of variable input 1 –5 ... +5 K 0 09 Sensor of variable input 2 –5 ... +5 K 0 10 Sensor of variable input 3 –5 ... +5 K 0 11 Room sensor SDW –5 ... +5 K 10 of direct heating circuit 0 12 Room sensor SDW –5 ... +5 K 10 of mixed heating circuit 1 0 13 Room sensor SDW –5 ...
SDC / DHC Control Functions Only those inputs and outputs that are actually present on the controller are available for setting in the "Hydraulics" menu. The function of the corresponding output is determined by the setting of the hydraulic parameter. Example: Parameter 05 defines the function assignment of the output for the direct heating circuit pump (DHCP). Ex works, this output is set to the corresponding setting for the direct heating circuit pump.
Control Functions SDC / DHC 6.1.
SDC / DHC Control Functions Function Adjustable at output Inputs Comment Fixed assign ment Optional (VI 1/2) Buffer loading pump VA1, VA2 (SDC 8-21, SDC 9-21, SDC 12-31, DHC 43-2) PF PF1 (19) Fixed assignment to VI if PLP is set to PF.
Control Functions SDC / DHC 6.3 Suppressing the cycle temperature on time program level When programming switching times, the specialist can set a system parameter to suppress the respective room or DHW temperature for the cycle. Function Setting "ON" causes control of the respective circuit to be based on the cycle temperatures stored in the switching cycles. For the "OFF" setting: 6.
SDC / DHC Control Functions 6.5 Switching from SDC to DHC Language selection occurs after the controller is started. You can then select the controller type: • SDC (heating controller) or • DHC (district heating controller) "SDC - DHC" appears on the top line. The selection option "SDC" or "DHC" appears at the bottom right. The controller type depends on the relay equipment or the set type/max code. Switching is only possible with relay equipment for which DHC types exist.
Control Functions SDC / DHC 6.8 6.8.1 6.8.1.1 Function Light construction General functions and their operation Outside temperature sensing Building type This parameter takes into account the relevant building type by means of various calculation methods for the determination of the outside temperature mean value according to the setting. The mean value is obtained over a period of 2 hours.
SDC / DHC Control Functions 6.8.2 NOTE Function Heating circuit outside temperature assignment Function active only when using a second outside sensor! If in the central device a second outdoor sensor (AF2) was connected to a variable input and registered, the heating circuit can be assigned either to the outside sensor 1, 2 or to the mean value of both sensors.
Control Functions SDC / DHC 6.8.4 Function Outside temperature disable The purpose of outside temperature disable is to prevent the heat generator from starting up above a defined outside temperature. If several heat generators are controlled though one device (automatic stoker, 2-stage), all stages of the device will be disabled with outside temperature disable.
SDC / DHC Control Functions The display for the heating curve adjustment occurs in combination, i.e. the design temperature (bottom right) and the slope (bottom left) are displayed and set in one display. Both flash during adjustment. The parameter (display above) is still HEATING CURVE. The jump occurs via the "Direct Heating Circuit" or "Mixed Heating Circuit 1"/"Mixed Heating Circuit 2" menu and the heating curve parameter. 6.8.
Control Functions SDC / DHC Cancelling switch-off The switch-off is cancelled when the current outside temperature drops below the set value by more than 1 K The summer switch-off function is cancelled: NOTE • in case of an outside sensor defect • in case frost protection is active The HEATING LIMIT parameter can be used to assist the summer switch-off function. This function allows setting nonheating periods on warm days for each individual heating circuit.
SDC / DHC Control Functions Operation with room temperature sensing As long as the room temperature is above the set room setpoint, the heating circuit pumps are running if outside temperatures are below the set freezing limit. If the room temperature drops below the set room setpoint, heating is resumed. Switch-off occurs again when the room temperature exceeds the set room setpoint by 1 K.
Control Functions SDC / DHC • With the frost protection setting "cycle operation", there is no continuous demand for the heat generator, in contrast to continuous operation. • With system frost protection active, the heating circuit pumps are switched on and the mixed heating circuit valves are closed.
SDC / DHC Control Functions 6.8.9 Pump forced operation Function With this function activated, all the pumps are switched on every day for approx. 20 seconds to protect against blocking owing to corrosion in case of long switch-off periods (> 24 h) and the mixed heating circuit is opened temporarily during this period. See also 5.2.3 "System Parameters" menu, Pg.
Hydraulic Components SDC / DHC 7 7.1 7.1.1 Hydraulic Components Heat generator: Boiler Heat generator start-up protection The start-up protection function prevents condensate building up when heating up while cold.
SDC / DHC Hydraulic Components Separate start-up protection for heat generator and heating circuits This function allows separation of the temperatures for switching on the burner and switching off the heating circuit when the boiler temperature falls below the boiler minimum temperature limit. See also 7.1.2 Function 5.2.4 "DHW" menu, pg.
Hydraulic Components SDC / DHC The boiler temperature is maintained according to the set minimum temperature, independent of demands or deactivating control modes. See also 7.1.3 Function 5.2.4 "DHW" menu, pg. 77 Maximum temperature limit heat generator In order to protect the heat generator against overheating, the controller is equipped with an electronic maximum temperature limit. It shuts off the burner if the temperature in the heat generator exceeds the limit value.
SDC / DHC Hydraulic Components burner switch-off or enabling in case of the interruption of the heat generator sensor. ATTENTION Only Ag (hard silver), Au (gold) or Ni (nickel) are to be used for the contacts. In case of a sensor short-circuit a relevant fault message appears and the burner is blocked. Burner enabling in case of a faulty heat generator sensor In case of a sensor short-circuit or interruption, a fault message appears upon simultaneous unlimited enabling of the burner.
Hydraulic Components SDC / DHC Switching differential I Switching differential I controls the heat generator capacity required according to load and demand by switching on and off the stage required for the actual heat demand within the set range. Switching on and off is initiated symmetrically to the setpoint within half of the absolute value of the switching differential.
SDC / DHC Hydraulic Components Combined operation for 2-stage heat generators • As long as just one stage can meet the heat demand (stage II inactive), stage I is switched according to switching differential I. • As soon as stage 2 is needed to meet the heat demand, switching differential I takes over the switching on and off of stage II and switching differential II takes over the switching of stage I.
Hydraulic Components Time delay stage II NOTE Enabling mode stage II SDC / DHC Enabling of stage II (full load stage) is controlled not only by the switching differentials but also by a time delay. In this way, stage II remains disabled for the set delay so that stage I will be active longer. This function is only effective during the start-up phase (when there is demand for both stages).
SDC / DHC Hydraulic Components fulfilled. Only when the outside temperature drops to the outside temperature disable level minus 2 K is the heat generator enabled again. If several heat generators are controlled though one device (condensing burners, 2-stage burners), all stages of the device will be disabled. NOTE Base load offset If a fault occurs at a heat generator, all outside temperature disables in the system are cancelled.
Hydraulic Components SDC / DHC 7.1.8 Operation for modulating burners Modulating burners are controlled in a way similar to mixed heating circuit control, through a PI control algorithm, since in this case an actuator integrated in the burner regulates the air/fuel ratio according to the heating power.
SDC / DHC Hydraulic Components Activation of modulation The modulating burner stage is activated when the heat generator temperature has dropped below the set nominal temperature by more than 1 K. The burner is enabled through the burner relay. As soon as the heat generator temperature crosses the switch-off level the burner is deactivated, in contrast to the mixed heating circuit parameters.
Hydraulic Components 7.1.11 SDC / DHC Modulation of integral action time Tn The integral part (= adjustment time) determines the dynamic behaviour of the controller and thus the time required by the controller to adjust for the actual control deviation. The adjustment time is independent of the amount of deviation. 7.1.
SDC / DHC Hydraulic Components 7.1.14 Modulation of start power The start power parameter determines a percentage setting for part of the modulation runtime during the start-up phase. With a setting of 0% the actuator valve remains always closed. As soon as the set start time has expired, the modulation switches to its normal control characteristics defined by the modulation parameters.
Hydraulic Components 7.1.15 SDC / DHC OpenTherm • OpenTherm is the plug & play bus system! • OpenTherm has developed into a standard in heating technology. Many gas condensing boilers today feature an OpenTherm connection or manufacturers offer an optional OpenTherm interface. • The OpenTherm bus uses simple bi-directional 2-wire communication between the heat generator and the room controller.
SDC / DHC Hydraulic Components 7.1.16 Function Use of boiler sensor 2 Two single-stage heat generators For sensing of the temperature in the second heat generator with double boilers or two single-stage heat generators (see "Heat Generator" menu, parameter 1 boiler type = 3) Two measuring points in the combustion chamber In order to reduce standby losses by increasing the burner runtimes.
Hydraulic Components SDC / DHC Discharge to heating circuits Any excess heat is dissipated into the heating circuits. The set maximum temperature is not exceeded here. The intended room temperature may be exceeded for short periods. If the respective circuits are equipped with room stations, the thermostat function should be activated. ATTENTION For floor heating a contact thermostat must be installed to control forced switch-off of the pumps.
SDC / DHC Hydraulic Components When the temperature limit is exceeded the heat generator is disabled and inhibited permanently. It can only be unlocked by a reset in the "Fault Messages" menu. Flue gas temperature limit With the parameter set accordingly, the allowable temperature limit for the flue gas, according to specifications of the heat generator manufacturer, has to be entered as the reference value for the follow-up functions described above. Recommended setting: Nominal flue gas temp. acc.
Hydraulic Components SDC / DHC Returning 7.2 Function The operating ours and start-ups can be reset separately for stage 1 and stage 2 via two parameters in the "Heat Generator" menu. Heat generation, heat exchanger, district heating The heat exchanger control assures that the right flow temperature is provided for all heating demands. The setpoint for the heat exchanger's secondary flow temperature is the maximum selection of all the required flow setpoints.
SDC / DHC Hydraulic Components 7.2.1 On/Off operation of the district heating valve To always ensure a minimum flow so that the heat meter can work precisely, pure on/off switching is provided in low load mode. Code 03 is suitable for this function as shown in the following diagram. 100 % x a 0% a Minimum travel x Valve travel y 100 % y Controller output Parameter Designation Range Presetti Step ng Unit 03 Minimum travel 0 ...
Hydraulic Components SDC / DHC temperature according to the required setpoint within its limits. The "Proportional Range", "Adjustment Time" and "Motor Runtime" control parameters can be set in parameters 04 and 05. Para- Designation meter Range Presetti Step ng Unit 04 S gain 0,1 ... 30 5 0.1 %/K 05 Adjustment time 0 ... 60 3 1 min 1 s 0 = pure P controller 06 146 10 ...
SDC / DHC Hydraulic Components 7.2.3 District heating return temperature limit Many district heating companies require min. volume flows in their networks. This can be achieved through a high temperature differential between the flow and return.
Hydraulic Components SDC / DHC By means of district heating return temperature limitation the required temperature difference is assured. The maximum limit can either be a fixed value limitation or a flexible limitation according to the outside temperature. A fixed value limit of e.g. 50°C means that the district heating return temperature will not exceed this value over the entire outside temperature range. In case of higher outside temperatures it is desirable that the maximum limit can be reduced, i.e.
SDC / DHC Hydraulic Components Besides return temperature limitation either volume flow limit or thermal output limit can also be set for this controller. The selection of these functions is described below in parameter 11. Para- Designation meter Range Presetting Step Unit 08 Max. return setpoint 0 ... 100 90 0.5 °C 09 Starting point of the flexible district heating return temperature Off Off 0.5 °C Return limit 0/1/2 0 - - 11 –40...
Hydraulic Components SDC / DHC 7.2.5 Hot-water pre-regulator with district heating systems The hot-water pre-control function is necessary for the controlled filling of hot water storage tanks with layered loading from the district heating network. Generally, such loading is carried out through a separate heat exchanger. The function is activated via a new setting in the "Hydraulics" menu, parameters 03 and 04.
SDC / DHC Hydraulic Components The boiler parallel shift of the tank loading pump (parameter) acts on the mixed heating circuit demand. The boiler parallel shift of mixed heating circuits acts on the heat generator, provided the tank loading pump control mode has not been set to "external storage tank". The optional return flow limit acts on the flow mixture according to the setting. The hot-water pre-control acts only on hot-water loading configured in the same device. 7.2.
Hydraulic Components SDC / DHC Legend: HWPCsetpoin t = Actual temperature at flow sensor "hot-water precontrol" HWsetpoin t = Hot-water setpoint temperature P 09 ( HW ) = Value of parameter 09 (hot-water loading temperature offset) SDHW = Switching difference hot water Both pumps (tank loading pump and hot-water pre-control) switch off after completion of a hot-water circuit loading, taking into account their extended running times.
SDC / DHC Hydraulic Components Activation ► Set "quick hot-water control" in the "Hydraulics" menu, parameters 03 and 04 (MC-1/MC-2), set value 39. The tank loading pump is operated via the tank loading pump output on the controller. The mixed heating circuit pump output switches together with the tank loading pump. The OPEN and CLOSED outputs of the assigned mixed heating circuit are provided fixed to actuator operation.
Hydraulic Components SDC / DHC Set value • Offset 0 - 100% • Default value 0%: Represents the valve start-up value (degree of opening) in %. It functions as an offset to the current valve position (0% means no accessing of the valve) • DTmin: 2 … 20 K, factory value: 5 K In case of a defect, the tank sensor or flow sensor switches off to prevent scalding. If hot-water loading is not activated, there is no setpoint for the mixed heating circuit.
SDC / DHC Hydraulic Components 7.2.9 Conditional parallel operation for mixed heating circuits This function is only realised for district heating controllers.
Hydraulic Components 7.2.11 Operation Function SDC / DHC Switch-off of district heating control "District Heating" menu, parameter 01: Setting range is extended to OFF, –10 ... +50. Setting OFF means district heating is deactivated. District heating valve permanently in STOP position when deactivated. The switch-over of the heat generator is controlled from the "District Heating" menu, parameter 01. 7.2.12 Return interval flushing If the return max.
SDC / DHC Hydraulic Components The pulses for the amount of heat flowing through are counted, e.g. 5 pulses within a minute. Through calibration via parameter 12, the actual thermal output in kW is calculated. 7.2.14 Charging pump (CHP) NOTE This function is only active if the charging pump function was assigned to one of the outputs "direct heating circuit pump", "variable output 1"or "variable output 2" in the "Hydraulics" menu.
Hydraulic Components 7.2.15 Primary pump NOTE Function only active if the PRIMARY PUMP function was assigned to one of the outputs variable output 1 or variable output 2 in the "Hydraulics" menu. Function Bus system Primary pump extended running time The primary pump is the functional equivalent of a loading pump. It is only active when heating demand to the heat generator is present. Hot-water requests are not considered.
SDC / DHC Hydraulic Components Boiler circuit pump prerunning time The pre-running time determines the switch-on delay of the burner and thus the pre-running time of the respective shut-off device used (motor valve, motor throttle) to ensure trouble-free circulation within the heat generator when switching on the burner. The setting of a pre-running time is only relevant if a shut-off device (e.g. motor throttle) is used instead of a boiler circuit pump at a variable output.
Hydraulic Components 7.2.17.1 Function SDC / DHC Bypass pump (RBP) The simplest way of controlling the return flow temperature is by means of a bypass pump. When the return temperature in the heat generator drops below the set boiler return minimum temperature limit, flow mixing is initiated by switching on a bypass pump parallel to the heat generator.
SDC / DHC Hydraulic Components 7.2.17.3 Function Indirect return increase Indirect return increase is realised by means of the mixed heating circuit valves in the heating circuits. It only works for systems without a bypass pump and without controlled flow mixing. When this function is active, two values are calculated independently for regulating each mixed heating circuit.
Hydraulic Components SDC / DHC Differences that can be balanced by installing a wall device (see available accessories) may occur between the measured room temperature in the inhabited area and the desired room temperature. 7.3.1.2 î Heating curve setting (heating curve) Press and hold the input button for 3 seconds to access the "Heating Curve" menu. x y a The slope of the heating curve describes the relation between the change in the flow temperature and the change in the outside temperature.
SDC / DHC Hydraulic Components ATTENTION To measure the room temperature, the heating circuit of the most occupied room is to be used. Radiator thermostat valves are used together with correctly designed radiators to control the external heat gain and should hence be almost completely open. During the adjustment phase additional external heat sources like fireplaces, majolica stoves, etc. should not be used.
Hydraulic Components 7.3.1.3 SDC / DHC Reduced operation See 5.2.5.1 Reduced operation, Pg. 79 7.3.1.4 Heating system See 5.2.5.2 Heating system, Pg. 80 7.3.1.5 Heating circuit temperature limit NOTE This function is not active if the heating circuit control is used as constant control (CC). Function This function limits the flow temperature of a heating circuit. The minimum and maximum temperatures set in the relevant parameters of a heating circuit do not exceed or fall below the setpoints.
SDC / DHC Hydraulic Components 7.3.1.6 Function Heating circuit temperature offset For special applications this function offers the possibility to admit the heating curve of the direct heating circuit with a constant offset value. The demand value plus the offset value is transmitted to the heat generator. The displacement of the heating curve is carried out in parallel with the flow temperature. Application See also 7.3.1.
Hydraulic Components SDC / DHC If another controller (addr. 20 ... 50) is connected to the direct heating circuit pump while the screed function is active, the screed function is cancelled automatically for the direct heating circuit pump. All other heating circuits except for the direct heating circuit at addr. 10 are disabled. Frost protection monitoring, for example, does not occur for these heating circuits during this time.
SDC / DHC Hydraulic Components Step 1 Function heating acc. to DIN 4725 Part 4 (setting 1) • Constant heating at 25°C on the start day and for the following three days. • Subsequently for another four days with the set maximum flow temperature with a maximum limit of 55°C. T VLSoll [˚C] 40 35 30 25 ST 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 t Maximum temperature setting = 40°C.
Hydraulic Components SDC / DHC On the start day, heating to 25°C is carried out until midnight. The first day of floor covering heating starts at midnight of the following day. T VLSoll [˚C] 40 35 30 25 ST 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 t Maximum temperature setting = 40°C. Progression of screed function over time with floor covering heating. 7.3.
SDC / DHC Hydraulic Components 7.3.4 7.3.4.1 Function No room sensor Room sensor active Room sensor active, operation disabled Application EN2H-0221GE51 R0808 Consideration of the room temperature/room influence Heating circuit room connection This function determines the enabling of the room sensor in conjunction with a wall device/room sensor with the direct heating circuit and all parameters affected by the room temperature sensing depending on the application.
Hydraulic Components Room sensor off, operation active Application See also 7.3.4.2 Function SDC / DHC At this setting the room sensor is only used as a display device without influencing the room temperature-related functions. The operation of the wall device is possible without restrictions. All system layouts that exclude room influence while the display of the actual room temperature is still required (in contrast to setting OFF). 5.4.4 "Direct heating circuit" menu (UNMIXED CIRC), Pg.
SDC / DHC Hydraulic Components High settings lead to a quicker adjustment of the control deviation, while they reduce the stability of the control circuit and can lead with excessively high setpoints to the oscillating of the control variable (room temperature). 7.3.4.3 Heating circuit room controller With this setting the heating circuit concerned can be controlled through a room controller. This requires a wall device SDW 30 with room control function.
Hydraulic Components SDC / DHC Parameter settings for the switch-on optimisation in the HC, MC-1 and MC-2 menu Para meter Designation Setting range/Setting values Factory setting 3 Room connection (in conjunction with room sensor) OFF Display of heat generator temperature, room sensor off, operation active OFF 1 Display of room temperature, room sensor active, operation active 2 Display of room temperature, room sensor active, operation disabled 3 Display of room temperature, room sensor off
SDC / DHC Hydraulic Components Activation of switchon optimisation NOTE ► Set Parameter 26 room setpoint ramp to OFF. ► Set parameter 41 switch-on optimisation to 1 = adaptation off or with connected room sensor to 2 = adaptation on. If parameter 41 switch-on optimisation is set to 1, parameters 42 min. pre-heating time and 43 max. pre-heating time are not required. If parameter 41 switch-on optimisation is set to 2, parameters 45 no room sensor and 46 pre-heating time at 0°C are not required.
Hydraulic Components SDC / DHC Parameter 46 pre-heating time at 0°C By setting the quick heat-up time at an outside temperature of 0°C, the heat-up speed affected. This value is included in the calculation of the pre-heating time. Pre-heating time = pre-heating time 0°C/20°C x (room setpoint – outside temperature) Parameter 47 lowering ramp This parameter setting specifies how fast the temperature is reduced before the end point of the heating cycle is reached, e.g. 10 p.m.
SDC / DHC Hydraulic Components 7.3.4.5 Setting range Function Application a Calculation by the controller based on the outside temperature c Pre-heat time at 0°C b 21°C parameter 45 without room sensor Room setpoint ramp OFF, 0.5 ... 60 K/h This function is only active in conjunction with an "RC" (room controller) function. The set value acts as a filter between the setpoint jump (change of the room setpoint temperature setting) and the room setpoint at the controller output.
Hydraulic Components SDC / DHC Switch-on: Flow setpoint < (current room setpoint + heating limit setting + 2 K) Example: Room setpoint = 22°C, heating limit setting = 2 K Switch-off at flow setpoint 24°C (22°C + 2 K) Switch-on at flow setpoint 26°C (22°C + 2 K + 2 K) Boundary conditions The SUMMER SWITCH-OFF function ("System Parameters" menu, parameter 04) has priority over the HEATING LIMIT function.
SDC / DHC Hydraulic Components 7.3.4.7 Function Heating circuit room frost protection limit This function determines the room temperature of the corresponding heating circuit during switch-off mode with frost protection active • during holiday mode • in automatic mode between the heating cycles with active ECO function (see parameter 1 - Reduced mode).
Hydraulic Components SDC / DHC of room setpoint, thermostat function, room controller setpoint etc.). Switch-over from heating mode to cooling mode: If the outside temperature is greater than summer switch-off (see "System Parameters", summer parameter) and the switch-on temperature for cooling, the cooling function is active. If the outside temperature is lower than the summer switch-off and the cooling switch-on temperature of cooling –1 K, the cooling function is not active.
SDC / DHC Hydraulic Components Humidistatic switch-off: To prevent excessive humidity build-up in the room, a humidistat can be connected to a variable input. Cooling without humidistatic switch-off: Output DCP or VO1 or VO2 System para. 25 switch-on temp. =25 MC1 para. 28 cooling temp. Cooling on / off MC2 para. 28 cooling temp. Cooling on / off Cooling with humidistatic switch-off: Output DCP or VO1 or VO2 =25 NOTE System para. 25 switch-on temp. MC1 para. 28 cooling temp. MC2 para.
Hydraulic Components SDC / DHC ► Ensure that the cooling circuits to be cooled are decoupled hydraulically from the actual heating system during active cooling. 7.3.4.
SDC / DHC Hydraulic Components The display of the unique heating circuit name appears 7.3.4.10 Function • in the menu selection • in the parameter tree • on the information level Room thermostat function (maximum room temperature limit) This function determines a room temperature-related limit with adjustable switching differential.
Hydraulic Components SDC / DHC Special mixing circuit functions (district heating control devices only) Return limit By setting an additional return sensor in the mixed heating circuit, the return temperature can be limited using this function. This is a maximum temperature limit. With some applications, an excessively high return temperature causes problems (e.g. district heating or condensing applications). They can occur if heat is not being extracted in the occupied room (e.g.
SDC / DHC Hydraulic Components 7.3.4.10.1.2 Integral action time Tn The integral part (adjustment time) determines the dynamic behaviour of the controller and thus the time required by the controller to adjust for the actual control deviation. The adjustment time is independent of the amount of deviation. Example: With a sudden flow temperature control deviation of 10 K (e.g.
Hydraulic Components 7.3.4.10.1.3 SDC / DHC Application Adjustment time Floor heating and other static heating surfaces 10 - 30 min. Radiator heating 6 -10 min. Convector heating 3 - 6 min. Sample time Ta The sample time is a controller-internal value which defines the time interval between two subsequent actuator pulses in the presence of a control deviation. Shorter sample times allow finer adjustments. 7.3.4.10.1.
SDC / DHC Hydraulic Components Example Coaction of P-part, I-part, adjustment time and sample time x a b c y d e f g h EN2H-0221GE51 R0808 i a OPEN position g Actuator pulse with control deviation XW = 25% b Actuator behaviour with control deviation 50% adjustment time Tn = 7 min. h P-part c Actuator behaviour with control deviation 25 % adjustment time Tn = 7 min. i d Adjustment time Tn (XW = 25%) x Mixed heating circuit opening (%) e Adjustment time Tn (XW = 50%) y Action time (min.
Hydraulic Components SDC / DHC Jump response to various control deviations (open control circuit, actuator removed) Adjustment time Tn = 7 min. Sample time Tn = 20 sec. Mixed heating circuit runtime = 2 min. The P-pulse that brings the mixed heating circuit to the new position and is proportional to the control deviation is followed by additional actuation pulses if the control deviation is not yet remedied (I-part). The adjustment time remains constant despite varying control deviations. 7.3.4.10.1.
SDC / DHC Hydraulic Components 7.3.5 7.3.5.1 Function Hot-water circuit daytime Hot-water production Hot-water tank loading (SLP) The output controls a hot-water circuit loading pump during the respective operational-readiness times upon demand. The hot-water daytime temperature provides for the desired hot water temperature during hot-water circuit operational-readiness times in automatic mode and in the PARTY and HEATING control modes.
Hydraulic Components Hot-water circuit - nighttime SDC / DHC Hot-water economy temperature is the setpoint for the hot-water tank between the active operating mode times in automatic mode. If a hot-water thermostat is used to determine the water heater temperature, the parameter for the setting of the economy temperature is skipped. Legionella protection In order to kill Legionella germs in the tank, a Legionella protection function can be activated.
SDC / DHC Hydraulic Components ATTENTION Hot water maximum temperature limit is a function protecting the tank and terminates hot water loading. If overshooting occurs, the tank loading pump switches off immediately. In this case it cannot be ensured that the set extended running time is adhered to.
Hydraulic Components NOTE SDC / DHC In this control mode, the loading temperature offset for the tank is to be selected so that the heat generator does not switch off before the heating circuits are enabled. A parallel shift of at least 10 K should be set so that this function can operate correctly.
SDC / DHC Hydraulic Components With discharge protection activated and a hot-water demand present, the hot-water loading pump enabled only when the temperature in the heat generator rises by more than 5 K above the current temperature in the hot-water tank. This measure prevents any rear tank discharge through the heat generator. The hot-water loading pump is disabled again as soon as the temperature differential between the heat generator and the hot-water tank has dropped to less than 2 K.
Hydraulic Components NOTE SDC / DHC Excessively long extended running times unnecessarily interrupt heating and increase the temperature in the hot-water tank.
SDC / DHC Hydraulic Components For hot-water loading without heating (tank priority), the number of heat generators is limited by the setting in the quick hot-water connection parameter. With parallel operation (heating circuit and hot-water demand simultaneously), there is no stage number limitation. With active hot-water loading, reversion of stages occurs under consideration of the configured switch-off delay.
Hydraulic Components SDC / DHC Tank parallel operation (combined operation: hot-water loading/heating) 10s WEZ1 10s WEZ3 WEZ2 2min 1min 2min 1min WEZ4 2min WEZ5 2min • Connection up to the stage of parameter 09 with minimum delay for hot-water loading • In case of further need via heating, further connection with configured delay of parameter 02 • Reversion with configured delay parameter 03 7.3.5.2 Circulation pump (CIR.
SDC / DHC Hydraulic Components switch-on and switch-off times. The hot-water circulation pump is in operation during the heating or hot-water cycles of the selected circuit and program. NOTE Circulation pump with district heating 7.3.5.2.1 Function If operation of the time programs P2 and P3 were not enabled (see "System Parameters" menu, time program parameter) and the circulation pump is assigned to one of these programs, the pump will operate according to the stored default times.
Hydraulic Components SDC / DHC 7.3.6 7.3.6.1 Function NOTE Solar/Solid fuel/Buffer Solar function The solar function makes it possible to combine solar power systems with heating and hot-water production systems in order to support the economy of the system. The solar loading pump can be controlled according to various switching conditions. This function can only be called up, if a configurable switching output was occupied with a solar loading pump.
SDC / DHC Solar tank maximum temperature limit Solar control mode Hydraulic Components If the temperature in the solar tank (hot-water tank or buffer tank) exceeds the set value, an active forced switch-on of the solar loading pump (see description for collector maximum temperature limit) is interrupted. This forced switch-on is enabled again as soon as the solar tank temperature falls more than 10 K below its set limit. This function defines the solar loading mode.
Hydraulic Components Parallel switch-over SDC / DHC Solar priority/parallel switch-over (only with solar control mode = priority mode) Operation in hot-water priority mode If the actual hot-water temperature undershoots the hot-water setpoint by the set amount, solar priority mode is cancelled until the hot-water setpoint has been reached. Example: Hot-water setpoint is 50°C, set value switch-over: 10 K. There is no demand for the heat generator until the hot-water temperature drops below 40°C.
SDC / DHC Hydraulic Components Volume flow (only if heat balancing is activated) This set value allows choosing between volume flow computed in NOTE Density of medium • litres/minute for calculating the flow volume or • litres/pulse when using the pulse input corresponding to the respective pumping capacity of the solar loading pump. With set value 0 L/min., no calculation of heat balancing is possible.
Hydraulic Components SDC / DHC For stratified discharge, an optional second buffer tank sensor (PF2) can be connected to a variable input (VI1 to VI3). The heat generator temperature is supplied by the temperature measuring device of the heat generator. Function Buffer or energy tanks are used for storing energy that is available without control (e.g. from solar power system or wood boilers). This energy buffer covers the energy demand from heating circuits and hot-water systems.
SDC / DHC Hydraulic Components Control mode 1 – Loading control for heating circuit and hot-water demand System hydraulics VF2 VF1 AF DKP MK2 MK1 PF SF SLP KF BR 1 a b PLP c PF2 a Heat generator b Buffer tank c Hot-water tank Heating circuit and hot-water controls send their demand values to buffer control. Buffer control demand additional energy from the heat generator via the buffer loading pump. See the table below for detailed correlations.
Hydraulic Components SDC / DHC Heating circuit controls send their demand value to buffer control. Hot-water and buffer controls demand energy from the heat generator when required. With hot-water priority activated, this function acts on the buffer loading pump and not on the heating circuits. See the table below for detailed correlations.
SDC / DHC Hydraulic Components Control mode 4 – Discharge control for heating circuit demand System hydraulics VF2 VF1 AF DKP MK1 MK2 PF KF PLP BR1 a b SF SLP c a Buffer tank c b Heat generator Hot-water tank As control mode 3, except that the demand from hot-water control are sent directly to the heat generator. An active hot-water priority only acts on the heating circuits when there is no buffer discharge in progress. See the table below for detailed correlations.
Hydraulic Components SDC / DHC Heating circuit controls send their demand value to buffer control. Hot-water and buffer controls demand energy from the heat generator when required. The buffer loading pump output is ON during buffer discharge and hot-water loading. Any active hot-water priority is not effective here.
SDC / DHC Hydraulic Components See the table below for detailed correlations: Buffer control mode 1 2 3 4 5 6 Buffer demand from HC/HW HC HC/HW HC HC – Heat generator demand from BUFFER BUFFER/ HW BUFFER BUFFER/ HW BUFFER/ HW HC/HW Buffer control mode Load Load Discharge 1 Discharge 1 Load Discharge 2 Buffer start-up protection acts on HC/HW HC HC/HW HC HC – Buffer discharge protection X X – – X – Buffer frost protection monitoring X X – – X – Buffer minimum
Hydraulic Components SDC / DHC Buffer control mode 1 2 3 4 5 6 Buffer loading pump function if heat generator is not available and buffer start-up protection is active – – OFF OFF – – Buffer loading pump function if heat generator is not available and buffer start-up protection is not active – – ON ON – – Action of heating generator start-up protection on heating circuits (HDCP, MC1, MC2): No No Yes Yes No Yes Action of heat generator start-up protection on hot-water circuit (ta
SDC / DHC Hydraulic Components Loading control The supply of energy from a controlled heat generator to the heating circuits is realised through loading the buffer. The buffer control ensures that the buffer is supplied with sufficient energy from the heat generator, via the buffer loading pump. With buffer discharge controls, it must be ensured that the residual energy from the buffer can be transported to the heating circuits if a controlled heat generator is not available.
Hydraulic Components SDC / DHC Discharge control 2 The heating circuits are always supplied with energy from the heat generator. As long as the buffer contains sufficient energy, the heat generator will be heated via the buffer loading pump instead of the burner. If the energy in the buffer is not sufficient, the burner will be started. NOTE Buffer setpoint temperature If a heat generator disable is active (e.g.
SDC / DHC Hydraulic Components Buffer temperature offset of heat generator To ensure an adequate control reserve for all consumers connected to the buffer tank, the demand value sent to the heat generator can be raised by an additional temperature offset. Buffer switching differential If the buffer tank temperature rises above the current demand value by the set amount, the buffer loading pump is switched off.
Hydraulic Components Buffer siphon function SDC / DHC Whenever the buffer tank is not being loaded by the heat generator (buffer setpoint reached) the differential between the heat generator temperature and the buffer tank temperature is measured continuously if configured to do so. The buffer loading pump is switched on as soon as the temperature differential rises above the set extended running switch-on differential.
SDC / DHC Hydraulic Components Depending on the activated buffer control mode, activated tank discharge protection must act on the buffer instead of the heat generator. The required conditions can be seen in the following table.
Hydraulic Components SDC / DHC 7.3.6.3 Solid fuel function NOTE This function can only be called up, if a configurable switching output was occupied with a solid fuel loading pump. The following sensors can be used for control: • SFS for the solid fuel boiler sensor The connection occurs automatically depending on the assignment of the output to VI1 or VI2.
SDC / DHC Hydraulic Components Solid-fuel boiler maximum temperature limit If the temperature in the solid fuel boiler rises above the set maximum temperature limit, the solid-fuel loading pump is forced to switch on. The excess heat is then dissipated into the preselected circuits (see "Buffer Tank" menu). This forced dissipation will be cancelled and the temperature differential control enabled when the solid-fuel boiler temperature undershoots the maximum limit by more than 10 K.
Hydraulic Components SDC / DHC to support heating during periods when less solar power is available. To ensure that the solar tank in priority operation (temperature sensing by the sensor of the solar loading switch-over, usually hot-water tank) can be loaded, checks are performed at regular intervals to determine whether sufficient solar power is available (meaning the solar panel temperature is sufficiently high for loading and the set switch-over temperature can be reached).
SDC / DHC Hydraulic Components 7.3.8 Hydraulic buffer relief (HBR) PF 1 KSPF B A 1 M HPE AB Buffer tank Function Using a 3-way switching valve (output active), hydraulic buffer relief (HBR) causes temporary intake into the upper region of the buffer tank, if that region has not reached its setpoint temperature yet, so that connected heating or hot water circuits receive priority supply of energy. When the buffer temperature exceeds the buffer setpoint by 2.
Hydraulic Components SDC / DHC Hydraulic function 7.3.9 If the output is deactivated (de-energised), the buffer is loaded (valve position A–AB, discharge deactivated).
SDC / DHC Hydraulic Components 7.3.10 Other system components 7.3.10.1 Global fault message input Function Activating this function causes the corresponding input to act as a switching contact. With the contact closed (short-circuited), the fault message input is treated as an additional fault in the control system. Intruding fault messages can thus be forwarded via the data bus or taken into account via an additional fault message output.
Hydraulic Components 7.3.10.4 Function SDC / DHC External switching modem Only activated if setting 11 (external switching modem) was selected for parameter 08, 09 or 10 (variable inputs) in the "Hydraulics" menu. This configuration allows switching between control modes via the telephone using a switching modem to be provided by the user (for holiday homes etc.). Assignment A switching modem can be assigned to each of the three variable inputs (VI1 ... VI3).
SDC / DHC Hydraulic Components In case of simultaneous access to a heating circuit, the following rules apply: • If multiple variable inputs are configured to the same heating circuit, the priority is as follows: variable input 1, variable input 2, variable input 3.
Hydraulic Components SDC / DHC ATTENTION No global controller function for data bus system with several central devices. Control modes and switching time settings are not effective when the demand contact is activated. The respective heating circuit only responds to requests from the demand contact. The control modes manual, emission measurement with safety temperature limiter check and screed function are of higher priority.
SDC / DHC Hydraulic Components 7.3.11 7.3.11.1 Function Bus communication Bus address of central device Control devices SDC and DHC 43 can be connected via a data bus. This makes it possible • to control additional heating circuits by adding up to four additional central devices. • to connect wall devices to the central devices and assign heating circuits. • to cascade multiple heat generators with one built-in central device each.
Hydraulic Components SDC / DHC Note that bus addresses can only be issued once. Duplicated addresses cause problems on the data bus. 7.3.11.2 7.3.11.2.1 Control functions via the data bus Boiler start-up protection If the selected heat generator operates with boiler start-up protection, it signals the status of start-up protection to all the corresponding heating circuits. They block the energy tapping (pumps off, mixed heating circuit closed) for the period of the start-up protection. 7.3.11.2.
SDC / DHC Hydraulic Components 7.3.11.2.6 Room temperature transmission The wall devices send their current room temperature to the assigned heating circuit at regular intervals. 7.3.11.2.7 Fault messages/Status indications Fault messages and status indications are sent from the central device to the associated wall units and displayed there. 7.3.11.2.
Hydraulic Components SDC / DHC The following components are connected to the first controller with bus address 10: • Outside sensor • Stages 1 and 2 of the burner • Boiler sensor • Tank sensor • Tank loading pump • Mixed heating circuit pump, mixed heating circuit open/closed and flow sensor of heating circuit 1 • Mixed heating circuit pump, mixed heating circuit open/closed and flow sensor of heating circuit 2 The following components are connected to the second control device with bus addr
SDC / DHC Hydraulic Components 7.3.11.2.9 Total flow sensor Correction of the heat generator after the total flow temperature The sensor connected to variable input 1 (2, 3) measures the total flow temperature in thermohydraulic distributors or in the common flow. Correction of the boiler temperature no longer occurs based on the measured temperature of the boiler sensor, but rather based on the total flow sensor.
Hydraulic Components SDC / DHC Example Initial values: • P-part = 0.5%/K • Sample time = 20 sec. • Adjustment time = 600 sec.
SDC / DHC Hydraulic Components 7.3.11.3 Operation of wall devices 7.3.11.3.1 Operation of digital wall device SDW 30 Function A digital wall device SDW 30 can be connected to the control device. With a digital wall device, remote control for a central device (e.g. from a living room) is possible in addition to the room temperature detection. Settings can be carried out for all the existing heating circuits.
Hydraulic Components SDC / DHC ATTENTION Double assignments of bus addresses are not permissible and inevitably lead to errors in data transmission and thus to faulty control behaviour of the heating system.
SDC / DHC Hydraulic Components Current room temperature sensing Control mode selection Address CU address Assignment 7 30 CU 3 – Direct heating circuit 8 30 CU 3 – Mixed heating circuit 1 9 30 CU 3 – Mixed heating circuit 2 A 40 CU 4 – Direct heating circuit B 40 CU 4 – Mixed heating circuit 1 C 40 CU 4 – Mixed heating circuit 2 D 50 CU 5 – Direct heating circuit E 50 CU 5 – Mixed heating circuit 1 F 50 CU 5 – Mixed heating circuit 2 The integrated room sensor determines the
Hydraulic Components Room setpoint correction SDC / DHC The input button can be used to modify the room temperature set at the central device by +/-6 K referenced to the central position. Turn clockwise: Temperature increase Turn anti-clockwise: Temperature decrease Display The indicator display is comprised of three LEDs.
SDC / DHC Hydraulic Components 7.3.11.3.3 Operation with NTC 20K room temperature sensor Instead of the RFF, an NTC 20 room sensor can be connected to a sensor input (VI1-VI3) Function Configuration is carried out in the "Hydraulics" menu, parameter 08, 09 or 10. Assignment to the heating circuit to be acted upon by the room sensor is carried out via a fixed heating circuit assignment using parameter settings (e.g.
Hydraulic Components SDC / DHC Extended access authorisation This authorisation status allows access to all heating circuits and to the hot-water circuit and their parameters and switching times within the respective central device Application Landlord status NOTE Once a wall device is connected and registered via the data bus to the central device, the central device automatically switches to remote operating mode! This is necessary to ensure clear operation of the system with connected wall devices.
SDC / DHC Hydraulic Components 7.3.12.2 Switching differential Connection delay Function of the cascade parameters Each heat generator has its own switching differential. The cascade switching differential must be set in such a way that it is always larger than the switching differential of any individual heat generator. The afterheating characteristics of the boilers used must be taken into account when rating the heating system.
Hydraulic Components 7.3.12.3 7.3.12.3.1 SDC / DHC Mode of operation of cascade control Switch-on characteristics The switch-on characteristics of the boiler stages are determined by the set switching differential and the dynamic switch-on delay.
SDC / DHC Hydraulic Components 7.3.12.3.3 7.3.12.3.4 Control characteristics • The heat generator that was switched on last adjusts the system to the set nominal temperature. • All other heat generators operate at the set maximum temperature (base load). • The boiler stage number can be reduced as soon as the adjusting stage has withdrawn its demand to the heat generator and the boiler temperature has risen above the setpoint temperature plus the set switching differential.
Hydraulic Components SDC / DHC Grouping for base and peak loads (ANF118-V2.2 specifications) High quality, expensive condensing boilers are used for the base load, especially with gas systems. During cold months, lowtemperature boilers are used for covering peak loads. It is necessary that an activated stage reversal only affect the base load boiler here. The peak-load boilers are excluded from the stage reversal.
SDC / DHC Hydraulic Components Safety temperature limiter This function works as described under "Safety temperature limiter check", with the following extension: As soon as a safety temperature limiter function is detected within the BUS system, all consumers (heating circuits) are disabled. Emergency mode Configuration of cascade control occurs in the central device with the bus address 10.
Hydraulic Components Manual call-up SDC / DHC Manual call-up of the AUTO SET function is always possible. The call-up is activated by pressing the input button during the version display until the AUTO SET function is shown in the display. The basic display is activated after the function has been carried out.
SDC / DHC Hydraulic Components Cancellation Emission measurement can be terminated at any moment in advance with the Safety check Function Application Cancellation Safety temperature limiter check may be performed only by the technician By keeping the input button î pressed during an emission measurement, the integrated heat generator maximum temperature limit is bypassed and the heat generator remains in operation continuously until the safety temperature limiter (STL) is triggered.
Hydraulic Components SDC / DHC Single-stage heat generator ("Heat Generator" menu, parameter 1 = 1) Switching sequence: OFF, ON, OFF ... 2-stage heat generator ("Heat Generator" menu, parameter 1 = 2) Switching sequence: OFF, STAGE 1, STAGE 1+2, STAGE 1, OFF ... 2x single-stage heat generators ("Heat Generator" menu, parameter 1 = 3) Switching sequence: OFF, HG 1, HG 1+2, HG 2, OFF ...
SDC / DHC Hydraulic Components Mixer motor: Mixed heating circuit actuator test Switching sequence Function STOP, OPEN, STOP, CLOSED, STOP ... For easier diagnosis by the technician, a test run that detects implausibilities in the system has been implemented. The jump occurs via an additional item in the relay test. The test run is started by pressing the input button. The sensor test sequence is similar to the final device test. Value Range OT –50°C – 40°C VF 10°C – 90°C SF 5°C ...
Hydraulic Components SDC / DHC Bus test The system configuration is conveyed via the SMILE BUS. Display occurs using an overview representation for a central device.
SDC / DHC Hydraulic Components 7.4 Error messages ATTENTION Inform the heating technician whenever any fault messages are output. The control device contains substantial error-notification logic. The error messages appear in continuous alteration with the basic display. Multiple errors that occur at the same time appear one after another in the order in which they occurred.
Hydraulic Components SDC / DHC Fault messages Fault status Designation Fault type Fault object code System Outside sensor Interruption 10-0 System Outside sensor Short-circuit 10-1 System Boiler sensor Interruption 11-0 System Boiler sensor Short-circuit 11-1 System Flow sensor 1 Interruption 12-0 MCP = off, MIMO = de-energised System Flow sensor 1 Short-circuit 12-1 MCP = off, MIMO = de-energised System Tank sensor Interruption 13-0 System Tank sensor Short-circuit 13-
SDC / DHC Hydraulic Components Fault messages Fault status Designation Fault type Fault object code Remark (RSC/RS) System Room sensor (RSC/RS) Short-circuit 20-1 System Burner 1 No switch-off 30-2 System Burner 1 No switch-on 30-3 System Burner 2 No switch-off 31-2 System Burner 2 No switch-on 31-3 System Heat meter No pulse 32-3 System Flue gas temperature Overshoot 33-5 System Flue gas temperature STL triggered 33-8 logical Boiler temperature Not reached 50-4 logi
Hydraulic Components SDC / DHC Fault messages Fault status Designation Fault type Fault object code Remark System Blocking EnXX Automatic stoker fault Fault Fault message log The control device has a fault message log in which a maximum of five fault messages can be saved. The fault messages are displayed with the date, time and fault type (fault number); the query is carried out in the sequence of the entered fault messages in the "Fault Message" menu.
SDC / DHC Hydraulic Components Additional fault processing: Faults appear in the basic display of the controller. System faults appear on the information level with the corresponding information value. Faults may be copied to the fault message log (see below for description). If configured accordingly, faults activate a fault message output to the connection of an optical or acoustic transducer and are forwarded to the corresponding gateways.
Hydraulic Components SDC / DHC The last (most recent) fault message is in first position; the previous fault messages are shifted down by a position with each new fault message. The fifth fault message is deleted when a new fault message appears. NOTE Operating information Key/Menu Parameter Display of logical fault messages SYSTEM 13 Fault memory inquiry FAULT MESSAGE ERR-1 .
SDC / DHC Hydraulic Components 7.4.1.1 Function Sensor calibration If the measured values of the connected sensors do not match the actual temperatures, a comparison of the sensor values is possible in the "Sensor Comparison" menu. In this menu, all sensors connected to the device can be corrected by ±5 K based on the factory calibration value. The current measured value, plus or minus the correction made and the correction itself, appears in the display. The increment of the compensation is 0.5 K.
Technical data SDC / DHC 8 8.1 Technical data General Mains connection voltage 230 V +6 % / –10 % Rated frequency 50 ... 60 Hz Power consumption max. 5.8 VA Pre-fuse max. 6.3 A slow-blowing Contact load of the output relays 2 (2) A Bus interface For the connection of external devices (wall device, PC, modem or gateway) Max. bus length 50 m Power supply via bus 12 V/150 mA Ambient temperature 0 ... +50°C Storage temperature –25 ...
SDC / DHC Technical data 8.1.1 Installation recommendations Mains voltage lines (mains connection, burners, pumps, servo motors): Diameter 1.5 mm2 Max. permissible length No limit for installation in buildings. Safety low-voltage lines (sensors, ext. switches upon demand via switching contact, modem connection lines, analog signal lines etc.) Diameter 0.5 mm2 Max.
Technical data SDC / DHC 8.2.2 PT 1000 For variable input 1 (VI-1) (setting of exhaust gas sensor), collector flow sensor (SPFS) °C Ω °C Ω °C Ω °C Ω 0 1000.00 80 1308.93 140 1535.75 280 2048.76 10 1039.02 85 1327.99 150 1573.15 300 2120.19 20 1077.93 90 1347.02 160 1610.43 320 2191.15 25 1093.46 95 1366.03 170 1647.60 340 2261.66 30 1116.72 100 1385.00 180 1684.65 360 2331.69 40 1155.39 105 1403.95 190 1721.58 380 2401.27 50 1193.95 110 1422.
SDC / DHC Technical data 8.
Log SDC / DHC 9 Log Weekly switching program Object: Mon (1) Set by: On: Cont. circuit Time Setpoint Opt. Tue (2) Cont. circuit Time Setpoint Opt. Wed (3) Cont. circuit Time Setpoint Opt. Thu (4) Cont. circuit Time Setpoint Opt. Fri (5) Cont. circuit Time Setpoint Opt. Sat (6) Cont. circuit Time Setpoint Opt. Sun (7) Cont. circuit Time Setpoint Opt.
SDC / DHC Index Index B Boiler circuit pump 158 Boiler circuit pump extended running time 159 Boiler circuit pump pre-running time 159 Boiler sensor 2 141 Boiler temperature offset 191 Buffer Discharge protection 211 Forced dissipation 209 Minimum temperature limit 208 Conditional priority 189 Constant temperature control 168 Cooling switch-over 177 Cycle operation 125 D Delay, enabling, full load in cascade operation 235 Demand contact 219 Design temperature 122 District heating control 156 District hea
Index SDC / DHC Fault 126 L Maximum temperature limit 130 Legionella protection 188 Loading enabling 191 Loading pump extended running 191 Minimum temperature limit 129 Reset 135 Sensor control mode 130 M Start-up protection 128 Menu Direct Heating Circuit 172, 180 Heating circuit bus authorisation 231 Heating circuit name 180 Heating circuit pump extended running time 165 Heating circuits minimum temperature limit 130 Heating curve 161, 162 Heating limit 175 Heating system 164 Hot water Circuit s
SDC / DHC Return interval 156 Return temperature 147, 149 Room connection 169 Room factor 170 Room frost protection limit 177 Room influence 169 Room sensor 169, 170 Room setpoint ramp 175 Room thermostat function 181 S Screed function 165 Selection level 48, 54, 59, 61, 72 Selection of parameter presettings 119 Sensor calibration 249 Solar Anti-blocking protection 199 Collector maximum temperature limit 196 Function 196 Heat balancing 198 Heat capacity 199 Heat generator cycle disable 197 Minimum runtime
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du Bois 37, Switzerland by its Authorized Representative: Automation and Control Solutions Honeywell House Arlington Business Park Bracknell, Berks, RG12 1EB Phone (44) 1344 656000 Fax (44) 1344 656644 http://honeywell.com/uk Printed in Germany All rights reserved. Subject to change without notice. EN2H-0221GE51 R0808 ./.
