Honeywell EN2H-0221GE51 R0808 - Manuals

Safety instructions SDC / DHC 14 EN2H-0221GE51 R0808 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 ma...

SDC / DHC Safety instructions EN2H-0221GE51 R0808 15 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 b y ç é æ a Ma...

Safety instructions SDC / DHC 18 EN2H-0221GE51 R0808 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 pe...

Overview SDC / DHC 20 EN2H-0221GE51 R0808 3 Overview The modular SDC / DHC control device is available in an installable switch cabinet version and a surface-mounted wall version with the following equipment features: Type Number of output relays Burner stage 2 or District he ating valve CLOSED Burn...

SDC / DHC Abbreviations EN2H-0221GE51 R0808 21 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 F...

Operation SDC / DHC 22 EN2H-0221GE51 R0808 5 Operation 5.1 Display and operating elements 10 11 2 1 3 4 7 6 8 9 5 1 "Manual mode" / "Emission measurement" button (not on district heating controllers) 2 "Operating modes" button (basic display) 3 "Switching time programs...

SDC / DHC Operation EN2H-0221GE51 R0808 23 5.1.1 Display (basic display) 1 2 34 5 C 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 swit...

Operation SDC / DHC 24 EN2H-0221GE51 R0808 5.1.2 Operating elements 5.1.2.1 Input button (press / turn) 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 , yo...

SDC / DHC Operation EN2H-0221GE51 R0808 25 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. ...

Operation SDC / DHC 26 EN2H-0221GE51 R0808 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 min...

SDC / DHC Operation EN2H-0221GE51 R0808 27 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 C P1 (P2, P3)* ê SUMMER C P1(P2, P3)* ë HEATING C ì RED. HEATING C í STANDBY C * P2 and P3 only after e...

SDC / DHC Operation EN2H-0221GE51 R0808 33 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 protecte...

Operation SDC / DHC 34 EN2H-0221GE51 R0808 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"...

Operation SDC / DHC 38 EN2H-0221GE51 R0808 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...

SDC / DHC Operation EN2H-0221GE51 R0808 39 Information Display Condition Remarks 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 circui...

SDC / DHC Operation EN2H-0221GE51 R0808 41 Information Display Condition Remarks MC1 actuator operating status Mixed heating circuit 1 specified Mixed heating circuit 1 opens, closes or does not move Mixed heating circuit 2 operating status Mixed heating circuit 2 specified Heating program: Holiday,...

Operation SDC / DHC 44 EN2H-0221GE51 R0808 5.1.2.8 "Manual mode" / "Emission measurement" button 5.1.2.8.1 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 generat...

Operation SDC / DHC 46 EN2H-0221GE51 R0808 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: ► Pre...

SDC / DHC Operation EN2H-0221GE51 R0808 47 5.1.2.10 Heating curve Determines the heating curve for the heating circuits. 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 heati...

Operation SDC / DHC 48 EN2H-0221GE51 R0808 Direct heating circuit (HC) = 1,5 Mixed heating circuit 1 (MC-1) = 1 Mixed heating circuit 2 (MC-2) = 1 x y a x Boiler / flow temperature [°C] y Outside temperature [°C] a T room [°C] 5.2 Menu-selection level The control device contains a menu-selection lev...

SDC / DHC Operation EN2H-0221GE51 R0808 55 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-wate...

SDC / DHC Operation EN2H-0221GE51 R0808 57 5.2.2.4 Programming switching times and cycle temperatures 5.2.2.4.1 Switch-on time The switch-on time is the start of heating or, with enabled switch-on optimisation, the start of assignment. After selecting the day of the week and the corresponding cycle,...

Operation SDC / DHC 58 EN2H-0221GE51 R0808 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 ...

SDC / DHC Operation EN2H-0221GE51 R0808 59 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...

Operation SDC / DHC 60 EN2H-0221GE51 R0808 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 operation Heating circuit Day from to Heat generator heating circuit Mo to Su 6:00 22:00 Hot...

SDC / DHC Operation EN2H-0221GE51 R0808 61 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. 4...

SDC / DHC Operation EN2H-0221GE51 R0808 63 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 weeke...

SDC / DHC Operation EN2H-0221GE51 R0808 65 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. î ö î ö ö HC Select heating circuit:...

SDC / DHC Operation EN2H-0221GE51 R0808 67 Copying heating circuits 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. Th...

Operation SDC / DHC 68 EN2H-0221GE51 R0808 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. 5.2....

SDC / DHC Operation EN2H-0221GE51 R0808 69 ATTENTION With the setting value ALL, all heating circuits and the hot-water circuit are overwritten with their default switching times with regard to the selected program. When overwriting occurs, individually created switching time programs are permanentl...

Operation SDC / DHC 70 EN2H-0221GE51 R0808 Reloading default programs Switching time programs P2 and P3 disabled HC Direct heating circuit MC-1 Mixed heating circuit 1 MC-2 Mixed heating circuit 2 DHW Hot-water heating circuit

SDC / DHC Operation EN2H-0221GE51 R0808 71 Reloading default programs Switching time programs P2 and P3 enabled DHW HC Direct heating circuit MC-1 Mixed heating circuit 1 MC-2 Mixed heating circuit 2 DHW Hot-water heating circuit

Operation SDC / DHC 72 EN2H-0221GE51 R0808 5.2.3 "System Parameters" menu The system parameters refer to general limiting parameters and specification values within the heating system. See 5.2 Menu-selection level, pg. 48 Returning to the basic display takes place by pressing the button or a...

SDC / DHC Operation EN2H-0221GE51 R0808 73 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...

Operation SDC / DHC 82 EN2H-0221GE51 R0808 Para-meter Designation Setting range / Setting values Factory setting Setting 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...

SDC / DHC Operation EN2H-0221GE51 R0808 101 Para-meter Designation Setting range / Setting values Factory setting Setting 13 Lead time of boiler circuit pump or parallel heat generator enable (only with appropriate configuration in the "Hydraulics" menu) 0 ... 10 min 0 14 Follow-up time of b...

SDC / DHC Operation EN2H-0221GE51 R0808 103 Para-meter Designation Setting range / Setting values Factory setting Setting OFF OFF 1 Discharge to process water tank 2 Discharge to heating circuits 29 Heat generator forced discharge 3 Discharge to buffer tank 30* OEM maximum limit Setting value of par...

Operation SDC / DHC 104 EN2H-0221GE51 R0808 * 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. Para-meter Designation Setting range / Setting values Fac...

Control Functions SDC / DHC 114 EN2H-0221GE51 R0808 Para-meter Designation Setting range / Setting values Factory setting 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...

Control Functions SDC / DHC 116 EN2H-0221GE51 R0808 6.1.1 Connection and settings table Inputs Function Adjustable at output Fixed assignment Optional (VI 1/2) Comment DHW loading SLP SF --- Fixed sensor input Direct heating circuit controlled by weather conditions DKP, MK-1, MK-2 --- --- Mixed heat...

Control Functions SDC / DHC 118 EN2H-0221GE51 R0808 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. Setting "ON" causes control of the res...

SDC / DHC Control Functions EN2H-0221GE51 R0808 119 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 sel...

Control Functions SDC / DHC 120 EN2H-0221GE51 R0808 6.8 General functions and their operation 6.8.1 Outside temperature sensing 6.8.1.1 Building type This parameter takes into account the relevant building type by means of various calculation methods for the determination of the outside temperature ...

Control Functions SDC / DHC 122 EN2H-0221GE51 R0808 6.8.4 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-sta...

SDC / DHC Control Functions EN2H-0221GE51 R0808 123 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 HE...

Control Functions SDC / DHC 124 EN2H-0221GE51 R0808 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: • in case of an outside sensor defect • in case frost protection is activ...

SDC / DHC Control Functions EN2H-0221GE51 R0808 125 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...

Control Functions SDC / DHC 126 EN2H-0221GE51 R0808 • 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...

Hydraulic Components SDC / DHC 128 EN2H-0221GE51 R0808 7 Hydraulic Components 7.1 Heat generator: Boiler 7.1.1 Heat generator start-up protection The start-up protection function prevents condensate building up when heating up while cold. There are three different modes of start-up protection that c...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 129 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...

Hydraulic Components SDC / DHC 130 EN2H-0221GE51 R0808 The boiler temperature is maintained according to the set minimum temperature, independent of demands or deactivating control modes. 5.2.4 "DHW" menu, pg. 77 7.1.3 Maximum temperature limit heat generator In order to protect the heat gen...

Hydraulic Components SDC / DHC 132 EN2H-0221GE51 R0808 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 th...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 133 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...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 135 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 sta...

Hydraulic Components SDC / DHC 136 EN2H-0221GE51 R0808 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 acco...

Hydraulic Components SDC / DHC 138 EN2H-0221GE51 R0808 7.1.11 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...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 139 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...

Hydraulic Components SDC / DHC 146 EN2H-0221GE51 R0808 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-meter Designation Range Presett...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 147 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. a Example 1 (factory setting) ...

Hydraulic Components SDC / DHC 148 EN2H-0221GE51 R0808 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 limi...

Hydraulic Components SDC / DHC 150 EN2H-0221GE51 R0808 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 ...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 151 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...

Hydraulic Components SDC / DHC 152 EN2H-0221GE51 R0808 Legend: t setpoin HWPC = Actual temperature at flow sensor "hot-water pre- control" t setpoin HW = Hot-water setpoint temperature ) ( 09 HW P = Value of parameter 09 (hot-water loading temperature offset) HW SD = Switching difference hot...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 153 ► 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...

Hydraulic Components SDC / DHC 154 EN2H-0221GE51 R0808 • 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) • DT min : 2 … 20 K, factory value: 5 K In case of a...

Hydraulic Components SDC / DHC 156 EN2H-0221GE51 R0808 7.2.11 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 wh...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 157 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) This function is only active if the cha...

Hydraulic Components SDC / DHC 158 EN2H-0221GE51 R0808 7.2.15 Primary pump 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. The primary pump is the functional equivalent of a loading pump. It...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 159 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 t...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 163 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 c...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 167 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 T VLSol...

Hydraulic Components SDC / DHC 168 EN2H-0221GE51 R0808 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 T VLSoll 40353025 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 [˚C] Ma...

Hydraulic Components SDC / DHC 170 EN2H-0221GE51 R0808 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 ...

Hydraulic Components SDC / DHC 174 EN2H-0221GE51 R0808 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 ...

Hydraulic Components SDC / DHC 176 EN2H-0221GE51 R0808 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) The S...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 177 7.3.4.7 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 heat...

Hydraulic Components SDC / DHC 178 EN2H-0221GE51 R0808 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...

Hydraulic Components SDC / DHC 180 EN2H-0221GE51 R0808 ► Ensure that the cooling circuits to be cooled are decoupled hydraulically from the actual heating system during active cooling. • Configured cooling is only active in automatic mode • When setting ECO mode, cooling does not take place during a...

Hydraulic Components SDC / DHC 182 EN2H-0221GE51 R0808 Special mixing circuit functions (district heating control devices only) 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 so...

Hydraulic Components SDC / DHC 184 EN2H-0221GE51 R0808 Application Adjustment time Floor heating and other static heating surfaces 10 - 30 min. Radiator heating 6 -10 min. Convector heating 3 - 6 min. 7.3.4.10.1.3 Sample time Ta The sample time is a controller-internal value which defines the time i...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 185 Example Coaction of P-part, I-part, adjustment time and sample time x a b c de f g h i y a OPEN position g Actuator pulse with control deviation X W = 25% b Actuator behaviour with control deviation 50% adjustment time T n = 7 min. h P-part c Ac...

Hydraulic Components SDC / DHC 186 EN2H-0221GE51 R0808 Jump response to various control deviations (open control circuit, actuator removed) Adjustment time T n = 7 min. Sample time T n = 20 sec. Mixed heating circuit runtime = 2 min. The P-pulse that brings the mixed heating circuit to the new posit...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 187 7.3.5 Hot-water production 7.3.5.1 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 wa...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 189 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 run...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 193 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 n...

Hydraulic Components SDC / DHC 194 EN2H-0221GE51 R0808 Tank parallel operation (combined operation: hot-water loading/heating) WEZ1 WEZ2 WEZ3 WEZ4 WEZ5 10s 10s 1min 1min 2min 2min 2min 2min • Connection up to the stage of parameter 09 with minimum delay for hot-water loading • In case of further nee...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 195 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. If operation of the time programs P2 and P3 were not enabled (see "System Parameters&#...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 197 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 e...

Hydraulic Components SDC / DHC 198 EN2H-0221GE51 R0808 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 un...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 199 (only if heat balancing is activated) This set value allows choosing between volume flow computed in • litres/minute for calculating the flow volume or • litres/pulse when using the pulse input corresponding to the respective pumping capacity of...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 205 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 Dis-charge 1 Di...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 207 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 ...

Hydraulic Components SDC / DHC 208 EN2H-0221GE51 R0808 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 energ...

Hydraulic Components SDC / DHC 210 EN2H-0221GE51 R0808 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 load...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 211 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. Buffer control mode 1 2 3 4 5 6 Tank discharge ...

Hydraulic Components SDC / DHC 212 EN2H-0221GE51 R0808 7.3.6.3 Solid fuel function 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...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 213 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). Thi...

Hydraulic Components SDC / DHC 214 EN2H-0221GE51 R0808 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 perf...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 215 7.3.8 Hydraulic buffer relief (HBR) AB A B M HPE PF KSPF 1 1 Buffer tank 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 reache...

Hydraulic Components SDC / DHC 216 EN2H-0221GE51 R0808 If the output is deactivated (de-energised), the buffer is loaded (valve position A–AB, discharge deactivated). If the output is activated (energised), only the top region of the buffer is loaded (valve position B–AB, discharge activated) Switch...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 221 7.3.11 Bus communication 7.3.11.1 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...

Hydraulic Components SDC / DHC 222 EN2H-0221GE51 R0808 Note that bus addresses can only be issued once. Duplicated addresses cause problems on the data bus. 7.3.11.2 Control functions via the data bus 7.3.11.2.1 Boiler start-up protection If the selected heat generator operates with boiler start-up ...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 223 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 ...

Hydraulic Components SDC / DHC 224 EN2H-0221GE51 R0808 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...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 225 7.3.11.2.9 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 temp...

Hydraulic Components SDC / DHC 226 EN2H-0221GE51 R0808 Example Initial values: • P-part = 0.5%/K • Sample time = 20 sec. • Adjustment time = 600 sec. • Total flow setpoint (w) = 68°C • Total flow actual value (x) = 53°C SVLF setpoint SVLF actual

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 227 7.3.11.3 Operation of wall devices 7.3.11.3.1 Operation of digital wall device SDW 30 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) ...

Hydraulic Components SDC / DHC 230 EN2H-0221GE51 R0808 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 The indicator display is comprised...

Hydraulic Components SDC / DHC 234 EN2H-0221GE51 R0808 7.3.12.3 Mode of operation of cascade control 7.3.12.3.1 Switch-on characteristics The switch-on characteristics of the boiler stages are determined by the set switching differential and the dynamic switch-on delay. The stage number is increment...

Hydraulic Components SDC / DHC 236 EN2H-0221GE51 R0808 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, low-temperature boilers are used for covering peak loads. It is...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 237 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. C...

Hydraulic Components SDC / DHC 238 EN2H-0221GE51 R0808 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 h...

Hydraulic Components SDC / DHC 240 EN2H-0221GE51 R0808 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 ....

Hydraulic Components SDC / DHC 242 EN2H-0221GE51 R0808 Bus test The system configuration is conveyed via the SMILE BUS. Display occurs using an overview representation for a central device. The following are displayed: • Central devices in the system network • Wall devices that are directly assigned...

Hydraulic Components SDC / DHC 244 EN2H-0221GE51 R0808 Fault messages Fault status Designation Fault type Fault object code Remark 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 Fl...

SDC / DHC Hydraulic Components EN2H-0221GE51 R0808 247 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)....

Hydraulic Components SDC / DHC 248 EN2H-0221GE51 R0808 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. Operating information Key/Men...

Technical data SDC / DHC 250 EN2H-0221GE51 R0808 8 Technical data 8.1 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...

SDC / DHC Technical data EN2H-0221GE51 R0808 251 8.1.1 Installation recommendations Mains voltage lines (mains connection, burners, pumps, servo motors): Diameter 1.5 mm 2 Max. permissible length No limit for installation in buildings. Safety low-voltage lines (sensors, ext. switches upon demand via...

Technical data SDC / DHC 252 EN2H-0221GE51 R0808 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 32...

SDC / DHC Technical data EN2H-0221GE51 R0808 253 8.4 Digital inputs Designation Brief description Input type Measurement range Impulse metering unit Imp Extra-low voltage ≤ 10 Hz Burner stage 1 operating hour counter BZ1 230 V OFF, ON Burner stage 2 operating hour counter BZ2 230 V OFF, ON

Log SDC / DHC 254 EN2H-0221GE51 R0808 9 Log Weekly switching program Object: Set by: On: Cont. circuit Time Setpoint Mon (1) Opt. Cont. circuit Time Setpoint Tue (2) Opt. Cont. circuit Time Setpoint Wed (3) Opt. Cont. circuit Time Setpoint Thu (4) Opt. Cont. circuit Time Setpoint Fri (5) Opt. Cont. ...

SDC / DHC Index EN2H-0221GE51 R0808 255 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 Sensor...

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