RVD120, RVD140 Controllers for district heating and d.h.w. Basic Documentation Edition 2.
Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Theilerstrasse 1a CH-6300 Zug Switzerland Tel. +41 58-724 24 24 © Siemens Switzerland Ltd 2009 Delivery and technical specifications subject to change www.siemens.
Contents 1 Summary ....................................................................................................... 13 1.1 Brief description and key features ................................................................. 13 1.2 Type summary ............................................................................................... 13 1.3 Equipment combinations ............................................................................... 13 1.3.1 Suitable sensors ....................
.3.1 Types of sensors............................................................................................23 4.3.2 Handling faults ...............................................................................................23 4.4 Room temperature (A6) .................................................................................24 4.4.1 Types of sensors............................................................................................24 4.4.2 Handling faults .................
10 Function block Plant configuration................................................................. 33 10.1 Operating lines .............................................................................................. 33 10.2 Plant configuration ......................................................................................... 33 10.3 Device functions ............................................................................................ 34 11 Function block Space heating ..........
12.1 Operating lines ...............................................................................................47 12.2 Mode of operation ..........................................................................................47 12.3 Control process ..............................................................................................47 12.4 Maximum limitation of the common flow ........................................................47 12.5 Minimum limitation of the common flow .....
14.7 Instantaneous d.h.w. heating......................................................................... 58 14.7.1 General .......................................................................................................... 58 14.7.2 Location of sensors ....................................................................................... 58 14.7.3 Flow switch .................................................................................................... 58 14.7.
19.2.4 Contact state H5 ............................................................................................68 19.2.5 Resetting the heating engineer level..............................................................68 19.2.6 Software version ............................................................................................68 20 Function block Modbus parameters ...............................................................69 20.1 Operating lines ..................................
22.3.9 Configuration of sensors................................................................................ 95 22.3.10 Reset of the 2 meters “Refill time per charging cycle“ and “Refill time per week“ ....................................................................................................... 95 23 Function block Locking functions................................................................... 96 23.1 Operating lines ..................................................................
26.1.5 Safety concept .............................................................................................108 26.1.6 Setting levels and access rights...................................................................108 26.2 Commissioning ............................................................................................108 26.2.1 Installation instructions.................................................................................108 26.2.2 Operating lines ...................
Glossary In this Basic Documentation, the following specific terms are used: Heat source, heat generation Pumps Term Explanation Heat converter Heat exchanger that, on the primary side, is connected to the district heat network and that, on the secondary side, delivers the hot water to a common flow. Several consumers, such as zone controllers, are connected to the common flow. Heat exchanger Heat exchanger that delivers the heat directly to the consumers (e.g. space heating, d.h.w. heating etc.).
/120 Siemens Building Technologies District heating controller RVD120, RVD140 Glossary CE1P2510en 2018-04-30
1 Summary 1.1 Brief description and key features • RVD120/140 are multifunctional district heating controllers for flow temperature control of heating circuits and for the control of d.h.w. heating • Their exclusive field of use are plants with district heat connection in smaller residential and nonresidential buildings • The RVD120 offers 3 preprogrammed plant types while the RVD140 offers 8.
• For pressure: Suitable are sensors with DC 0…10 V signal, e.g. − Pressure sensor QBE2002… 1.3.2 Suitable room units • Room unit QAA50.110/101 • Room unit QAW70 1.3.3 Suitable valve actuators All types of actuators from Siemens with the following features can be used: • Electromotoric or electrohydraulic actuators • Running time 10…900 seconds • Three-position control • Operating voltage AC 24…230 V 1.3.
2 Use 2.1 Types of plant The RVD120/140 are suited for all types of indoor plants that • are connected to a district heat network • use weather- or room temperature-compensated flow temperature control • have the control of d.h.w. heating integrated 2.
2.5 D.h.w. functions The RVD120/140 are used if 1 or several of the following d.h.w. functions is/are required: • D.h.w. heating via heat exchanger in the storage tank • Instantaneous d.h.w. heating via heat exchanger, with or without mixing valve in the d.h.w. circuit • Instantaneous d.h.w. heating via heat exchanger, with storage tank, with or without mixing valve in the d.h.w. circuit • Common or separate heat exchangers for the heating circuit and d.h.w. heating • D.h.w.
3 Fundamentals 3.1 Key technical features The controllers offer 2 key technical features: • The RVD120 has 3 plant types preprogrammed, the RVD140 has 8. Section 3.2 ”Plant types” gives a detailed description Plant type RVD120 RVD140 D.h.w. system 1 − 2 D.h.w. via storage tank 3 D.h.w. via storage tank 4 Instantaneous d.h.w. heating, d.h.w. via second heat exchanger 5 Instantaneous d.h.w. heating, d.h.w. via second heat exchanger 6 Instantaneous d.h.w.
3.2 Plant types • The RVD120 has 3 preprogrammed plant types • The RVD140 has 8 preprogrammed plant types The required functions are ready assigned to each type of plant. When commissioning the heating plant, the relevant plant type must be selected. With the existing choice of controllers and plant types, practically all types of heating plants with district heat connection and own d.h.w. heating facility can be controlled. Optional functions must be configured as such.
3.2.3 Plant type no. 3 B9 T U2 B1 P T M RVD120 and RVD140 A6 N1 M1 T Y1 B3 Kx T T B7 P B71 M T U1 Y7 M7 B6 T B32 Kx Kx Heating circuit control with d.h.w. heating (storage tank). Circulating pump, refill function, electric immersion heater and solar d.h.w. heating optional. 3.2.4 Plant type no. 4 B9 T 0nly RVD140 N1 U2 A6 B1 P T M Y1 T T P B71 M1 B7 Kx U1 B3 M7 M T B71 Y5 H5 Separate heat exchangers for heating circuit and d.h.w.
3.2.6 Plant type no. 6 B9 T 0nly RVD140 N1 U2 A6 B1 P T M Y1 T T P B71 M1 B7 U1 Kx T T Kx B3 M7 B6 T T M3 M B71 B32 Kx Y5 Separate heat exchangers for heating circuit and d.h.w. heating. Instantaneous storage tank connected to separate heat exchanger, d.h.w. charging with charging pump. Sensor B71 can be used as follows: • As a d.h.w. sensor, or • For the DRT function Circulating pump, refill function, electric immersion heater and solar d.h.w. heating optional. 3.2.
3.2.8 Plant type no. 7 B9 T M1 B1 U2 P Y5 M T M 0nly RVD140 A6 N1 Kx M3 T M B71 M B6 T T T M7 T B71 B3 Y1 B7 Kx T B32 Kx P U1 Two heat exchangers connected in series for heating circuit and d.h.w. heating. Instantaneous storage tank connected to the second heat exchanger, with mixing valve control for d.h.w. Sensor B71 can be used as follows: • As a d.h.w. sensor, or • For the DRT function Refill function, electric immersion heater, solar d.h.w.
3.3.2 D.h.w. heating Automatic d.h.w. heating D.h.w. heating ON / OFF • ON (button lit): D.h.w. is heated independently of the heating circuit’s operating mode and control • OFF (button dark): No d.h.w. heating; circulating pump switches off, frost protection is ensured 3.3.3 Manual operation Manual operation • No control • Heating circuit pump and d.h.w.
4 Acquisition of the measured values 4.1 General In the event of a faulty sensor, the RVD120/140 always attempt to maintain the required comfort level, even at the expense of certain heat losses, which will not cause any damage however. In the case of severe faults that make it impossible for the RVD120/140 to ensure control, a fault status message is delivered. The controller displays this as Er (Error). 4.2 Flow temperature (B1) 4.2.
4.4 Room temperature (A6) 4.4.1 Types of sensors The room temperature is acquired via a PPS (point-to-point interface). Only a unit with an appropriate output signal can be connected to it. The following types of units can be used: • Room unit QAA50.110/101 • Room unit QAW70 4.4.2 Handling faults A short-circuit at the PPS leads to a fault status message. An open-circuit does not lead to a fault status message since it is possible, that no room unit is connected. 4.4.
1 sensor with solar d.h.w. heating (operating line 98 = 1) If there is an error (short-circuit or open-circuit) in one of the measuring circuits, the controller continues to work with the other measuring circuit, if possible. No fault status message is delivered. If none of the measuring circuits delivers a valid measured value, a fault status message is generated. The d.h.w. pump or the diverting valve and the collector pump will be deactivated. 2 sensors with solar d.h.w.
4.9 Collector temperature (B6) 4.9.1 Measurement The collector temperature is acquired by a sensor with sensing element LG-Ni 1000 and an extended measuring range. 4.9.2 Handling faults In case of a short-circuit or open-circuit in the measuring circuit, a fault status message is delivered and the collector pump deactivated with a delay of 12 hours. There is no solar d.h.w. heating. The controller’s LCD displays Er.
5 Function block End-user space heating This function block contains settings and readouts that are intended for the end-user. 5.1 Operating lines The buttons for selecting the operating lines and for adjusting the settings are described in section 26.1 ”Operation”. Line Function, parameter Factory setting (range) Current nominal room temperature setpoint 1 Display function Reduced room temperature setpoint 2 14.
• The heating curve slope is to be set on operating line 5. The setting range is 0.25 to 4.0. For more detailed information, refer to section 11.3 ”Heating curve”. The setpoint of the nominal and the reduced room temperature plus that for frost protection are to be entered directly in °C room temperature. These setpoints apply irrespective of whether or not the control uses a room sensor. If there is no room sensor, the room model is used. 5.
6 Function block Clock settings 6.1 Operating lines Line 13 14 15 16 6.2 Function, parameter Time of day Weekday Date Year Factory setting (range) Unit (00:00…23:59) Display function (01.01…31.12) (2009…2099) hh:min d dd.MM yyyy Entries The RVD120/140 have a yearly clock with the time of day, weekday and date. The weekday on line 14 is set automatically with the date and cannot be adjusted. Changeover from summer- to wintertime, and vice versa, takes place automatically.
7 Function block End-user d.h.w. heating 7.1 Operating lines Line 17 18 19 20 21 22 23 41 42 Function, parameter Weekday for entering the d.h.w. program Release period 1 start Release period 1 end Release period 2 start Release period 2 end Release period 3 start Release period 3 end D.h.w. normal setpoint D.h.
8 Function block Display actual value sensors 8.1 Operating lines Line 24 25 26 27 8.2 Function, parameter Room temperature Outside temperature D.h.w.
9 Function block Standard values and fault indication 9.1 Operating lines Line 49 50 9.2 Function, parameter Reset of operating lines on the end-user level Display of faults Factory setting (range) Unit Display function Reset end-user level If operating line 49 is set to 1, all the current settings on the end-user level (operating lines 2…12, 17…23, 41 and 42) are cleared. In that case, the factory settings will be used again. Proceed as follows: 1. Select operating line 49.
10 Function block Plant configuration 10.1 Operating lines Line Function, parameter 51 Plant type 52 53 54 Space heating present Universal sensor Flow switch / circulating pump present (offsetting heat losses) Return flow of circulating pump Pump kick Winter- / summertime changeover Summer- / wintertime changeover 55 56 57 58 10.2 Factory setting (range) Unit 1 (RVD120: 1…3 RVD140: 1…8) 1 (0 / 1) 1 (0 / 1) 0 (0…3) 0 (0…2) 1 (0 / 1) 25.03 (01.01…31.12) 25.10 (01.01…31.12) dd.MM dd.
10.3 Device functions • The pump kick function can be activated or deactivated on operating line 56 (refer to subsection 11.10.2 “Pump kick“) • The change from wintertime to summertime, and vice versa, is made automatically. If international regulations change, the relevant changeover dates can be entered on operating lines 57 and 58. The entry to be made is the earliest possible changeover date.
11 Function block Space heating 11.1 Operating lines Line 61 62 63 69 70 71 72 73 74 Function, parameter Heating limit (ECO) Building structure Quick setback with room sensor Heat gains Room temperature influence (gain factor) Parallel displacement of heating curve Overrun time heating circuit pump Frost protection for the plant Max. limitation of room temperature Factory setting (range) Unit –3 (--- / –10…+10) 1 (0 / 1) 1 (0…15) 0 (–2…+4) 10 (0…20) 0.0 (–4.5…+4.5) 4 (0…40) 1 (0 / 1) --- (--- / 0.
TA TAM TAD Generation of composite and attenuated outside temperature TA 25 20 TA TAD 15 TAM 10 5 0 Progression of actual, composite and attenuated outside temperature TA TAD kt TAM t t Actual outside temperature Attenuated outside temperature Building time constant Composite outside temperature Time 11.2.
Calculation of the setpoint change ∆wR is made in the steady state according to the following formula: Room authority E 2 × ( wR - xR ) 2510D06 ∆wR = Effect of room temperature setpoint change on the flow temperature setpoint ∆wR Change of room temperature setpoint s Slope of heating curve ∆wVT Change of flow temperature setpoint The flow temperature setpoint change ∆wVT is calculated according to the following formula: ∆wVT = ∆wR × (s × + 1) 11.3 Heating curve 11.3.
A substitute line is needed because the heating curve is slightly deflected. This is required to compensate for the nonlinear radiation characteristics of the different types of radiators. The basic setting is made according to the planning documentation or local practices. The heating curve is based on a room temperature setpoint of 20 °C. 11.3.
11.4.3 Setpoint of room temperature-compensated control 2510B02 The setpoint is generated based on the deviation of the actual room temperature from the setpoint. In addition, the heating curve with a fixed outside temperature of 0 °C is taken into consideration.
11.4.4 Setpoint of weather-compensated control with room temperature influence 2510B03 Here, in addition to the outside temperature and the room temperature setpoint, the heating curve and the room temperature influence act on the flow temperature setpoint.
11.5.2 Room temperature-compensated control . Prerequisites for this type of control: • Room unit connected • No outside sensor connected If no outside sensor is connected, the maximum room influence (20) will automatically be used. The setting on operating line 70 (room temperature influence) is inactive. The compensating variable for room temperature-compensated control is the deviation of the actual room temperature from the setpoint from which the room authority is generated.
11.6 Automatic ECO energy saver 11.6.1 Fundamentals The automatic ECO energy saver controls the heating system depending on demand. ECO considers the progression of the room temperature, which is dependent on the type of building construction as the outside temperature changes. If the amount of heat stored in the building is sufficient to maintain the current room temperature setpoint, the heating is switched off (valve closes, heating circuit pump is deactivated).
The thermal inertia of the building in the case of outside temperature variations is taken into account by including the composite outside temperature in the automatic ECO energy saver. 11.6.3 Heating limit ECO operates with a heating limit for which an ECO temperature can be set in the range –10...+10 K (operating line 61). The heating limit is calculated based on this ECO temperature and the room temperature setpoint. The switching differential of 1 K for switching on/off is entered as a fixed value.
11.8 Frost protection for the plant Frost protection for the plant protects the heating plant against freeze-ups by activating the heating pump (setting on operating line 73 = 1), provided both the controller and the heat source are ready to operate (mains voltage present). Frost protection for the plant is possible with or without outside sensor. The switching differential is 1 K (fixed value).
11.9.2 Mode of operation without room sensor Based on the flow temperature, the controller continuously determines the relevant room temperature. If the relevant room temperature falls below the frost protection setpoint, the controller switches the heating circuit pump on and controls the flow temperature such that the relevant room temperature will lie above the frost protection setpoint by the amount of the switching differential of 1 K, provided the heating curve slope is correctly set.
Switching the pump off This protection against overtemperatures is activated in all plant types if a maximum limit value of the flow temperature has been entered. The limit value of the heating circuit is used (setting on operating line 95). If the flow temperature exceeds the maximum limit value of the flow temperature by 7.5 °C, the heating circuit pump is deactivated. When the flow temperature has dropped below that limit, the pump is activated again for a minimum of 3 minutes.
12 Function block Actuator heat exchanger 12.1 Operating lines Line Function 81 82 83 85 Actuator running time, common flow P-band of control, common flow Integral action time of control, common flow Maximum limitation, common flow 86 Minimum limitation, common flow 12.2 Factory setting (range) Unit 120 (10…873) 35 (1…100) 120 (10…873) --- (variable …140) s K s °C --- (8…variable) °C Mode of operation This function block controls the motorized valve through which – with plant types no.
13 Function block Actuator room heating 13.1 Operating lines Line Function 91 92 93 94 95 Actuator running time, heating circuit P-band, heating circuit Integral action time, heating circuit Setpoint boost for control of the common flow (B1 and Y1) Maximum limitation of the flow temperature 96 Minimum limitation of the flow temperature 13.
13.6 Actuator pulse lock This function acts on all three-position actuators controlled by the RVD120/140. If an actuator has received closing pulses for a total period of time that represents 5 times its running time, additional closing pulses from the controller are suppressed. For safety reasons, the controller delivers a closing pulse of 1 minute at 10-minute intervals. An opening pulse negates the pulse lock.
14 Function block D.h.w. heating 14.1 Operating lines Line 98 101 102 103 104 105 106 107 108 109 119 124 Function D.h.w. sensor Release of d.h.w. heating Release of circulating pump (RVD140 only) D.h.w. switching differential Legionella function Setpoint legionella function D.h.w. priority Overrun time charging pump M3 Overrun time charging pump M7 Max. time d.h.w. heating Reduced d.h.w. setpoint for storage tank sensor at the bottom Load limit when flow switch is actuated 14.
14.3.3 Release of the circulating pump This function is only possible with controller type RVD140. It controls circulating pump M7. Operation of the circulating pump prevents the d.h.w. piping system from cooling down. Operation of the pump depends on the type of plant: • Plant type no. 1 has no circulating pump • With plant type no. 4, the circulating pump runs according to the release given • With plant types no. 2, 3, 6 and 8, the circulating pump remains off during d.h.w.
• With plant types no. 4, 5, 6 and 8, the differential of the d.h.w. flow temperature setpoint and the actual value is integrated for generating a locking signal corresponding to the integral value • No priority can be selected with plant type no. 3. The changeover valve always ensures absolute priority • If, during charging pump overrun, the heating circuit calls for heat, the heating circuit pump is activated, independent of the selected priority 14.3.
14.4 D.h.w. heating with a storage tank 14.4.1 General D.h.w. heating with a storage tank is covered by plant types no. 2, 3 and 6b (refer to section 14.5 ”Plant type no. 6b”), and 8. The controller supports 3 types of plant (no. 2, 3 and 8) where the heating circuit and d.h.w. heating use one common heat exchanger. The heating circuit is a pump or mixing circuit. With plant types no. 2 and 3, either the RVD120 or RVD140 can be used. The RVD140 can also control the circulating pump.
14.4.2 Regulating unit For d.h.w. heating, a charging pump (plant type no. 2) or diverting valve (plant type no. 3) can be used. When using a diverting valve, the d.h.w. priority is always absolute because it is dictated by the diverting valve. Only the RVD140 has a relay output for control of the circulating pump. 14.4.3 Manual d.h.w. heating Manual d.h.w. heating is activated by pressing the operating mode button for d.h.w. heating for 3 seconds. D.h.w. heating is also switched on if • d.h.w.
14.4.7 Reduction of d.h.w. setpoint for storage tank sensor at the bottom When using 2 storage tank sensors, the switch-off criterion for charging is reached when the sensor at the top acquires the value of TBWw and the sensor at the bottom the value of TBWw – [setpoint reduction storage tank sensor at the bottom].
14.5 Plant type no. 6b 14.5.1 Layout The RVD140 can also provide d.h.w. heating in plants where d.h.w. is heated directly by the primary circuit of the district heating network. In that case, the heat exchanger only supplies heat to the heating circuit. The return from the d.h.w. circulating pump must be fed into the storage tank.
14.6 Instantaneous d.h.w. heating with storage tanks 14.6.1 General Instantaneous d.h.w. heating with storage tanks is covered by plant types no. 6 and no. 7. In these plants, separate heat exchangers are used for space heating and d.h.w. heating: • Plant type no. 6: Heating circuit heat exchanger and d.h.w. heat exchanger are connected in parallel • Plant type no. 7: Heating circuit heat exchanger and d.h.w. heat exchanger are connected in series These applications require no flow switch. 14.6.
14.7 Instantaneous d.h.w. heating 14.7.1 General Direct d.h.w. heating is covered by plant types no. 4 and 5. In these plants, separate heat exchangers are used in parallel mode for space heating and d.h.w. heating. Combi heat exchangers also belong to this category. The d.h.w. is heated with or without mixing in the secondary circuit. 14.7.2 Location of sensors Special attention must be paid to the correct location of the sensors in the flow and the return.
Mode of operation T M T Plant without flow switch Setting on operating line 54 0 1 2 3 Flow switch present No Yes Yes Yes M T Plant with flow switch Circulating pump present Either way No Yes Yes Heat losses will be compensated for Yes, completely (100 %) No Yes, partly (80 %) Yes, completely (100 %) Explanations relating to the settings Setting 0 Efforts are made to maintain the d.h.w. setpoint and all heat losses are completely compensated for.
14.7.6 Adaptation to the time of year To enable the controller to provide stable control of the d.h.w. also when connection conditions change (summer/winter operation), the control must adjust the actuator’s running time. This adaptation is accomplished with the current maximum stroke. When the plant is switched on, the assumption is made that the current maximum stroke is 50 %.
14.7.9 Plants with no mixing circuit This kind of control is implemented with plant type no. 4. Controlled variable is the flow temperature in the d.h.w. circuit, which is acquired with sensor B3. It is controlled by adjustment of the two-port valve in the primary circuit. This kind of control necessitates a ”fast” actuator, preferably with a running time of 10 seconds.
15 Function block Extra legionella functions In d.h.w. systems with storage tanks, the legionella function ensures that legionella bacteria do not occur. This is accomplished by periodically raising the d.h.w. temperature in the storage tank. 15.
15.1.5 Operation of circulating pump The circulating pump can be forced to run during the period of time the legionella function is active. This ensures that hot water also circulates through the plant’s hot water distribution system. Entry (0 or 1) is made on operating line 128. If the storage tank temperature exceeds the legionella setpoint minus 1 K, the circulating pump is forced to run.
16 Function block D.h.w. actuator 1 16.1 Operating lines Line Function 111 112 113 114 115 116 117 Actuator Y5 opening time, d.h.w. mixing valve Actuator Y5 closing time, d.h.w. mixing valve P-band d.h.w. control Integral action time d.h.w. control Derivative action time d.h.w. control Setpoint boost with d.h.w. heating Max. d.h.w. temperature setpoint 16.
17 Function block D.h.w. actuator 2 17.1 Operating lines Line Function 121 122 123 Actuator running time, d.h.w. mixing valve Y7 P-band d.h.w. control Y7 Integral action time d.h.w. control Y7 17.2 Factory setting (range) Unit 35 (10…873) 35 (1…100) 35 (10…873) s K s Mode of operation With plant type no. 5, this function block controls mixing valve Y7 of the secondary d.h.w. circuit. For more detailed information about this control, refer to section 14.7 ”Instantaneous d.h.w. heating”. 17.
18 Function block Multifunctional relays Function block “Multifunctional relays“ can be used to parameterize further optional functions on operating lines 129 and 130. These functions are only supported by the RVD140. 18.1 Line 129 130 Operating lines Function Function multifunctional relay K6 Function multifunctional relay K7 18.
19 Function block Test and display 19.1 Operating lines Line Function 141 142 Sensor test Relay test 143 146 149 150 Display of active limitations Contact status at terminal H5 Reset of operating lines on the heating engineer level Software version 19.2 Factory setting (range) Unit 0 (0…9) 0 (RVD120: 0…5) (RVD140: 0…10) Display function Display function Display function Mode of operation 19.2.
Caution! With plant types no. 4 and 5, the relay test may be made only when the main shutoff valve is fully closed! Recommendation: When making the relay test, always close the main shutoff valve. 19.2.
20 Function block Modbus parameters 20.1 Operating lines Line Function 171 172 173 174 Device number Parity Baud rate Modbus version 20.2 Factory setting (range) Unit --- (--- / 1…247) 0 (0…2) 3 (0…4) General The RVD120/140 are equipped with a Modbus RTU interface (RS-485). As slaves, they are able to respond to the questions from a Modbus master (building control center) in the Modbus RTU protocol. Up to 247 devices can be addressed in a Modbus communication network.
20.5 Modbus communication 20.5.1 Timing 2510B04 The controller’s maximum response time tresp for read-and-write commands is different. Master Slave/s tresp Maximum response time when reading: .. tresp = 210 ms Maximum response time when writing: tresp = 360 ms 20.5.
20.5.5 Data points General information about data points The following subsection 20.5.6 ”Data point table“ lists the data points available via Modbus. The following data point table represents Modbus version V1.0. For more detailed information about the data points, refer to the relevant sections in this Basic Documentation. The data points were subdivided – in contrast to the manual setting on the controller.
Range Slope Resolution Operating line number Modbus address Dec (hex) 20.5.
Range Slope Resolution Operating line number Modbus address Dec (hex) Parameter 0/1 1 1 223 (0x00DF) 73 Frost protection for the plant 224 (0x00E0) 74 Max. limitation of the room temperature 0.5…4 K 1/64 0.5 Max.
Range Slope Resolution Operating line number Modbus address Dec (hex) Parameter 1…20 K 1/64 1 Explanations, notes and tips 246 (0x00F6) 103 D.h.w. switching differential 247 (0x00F7) 104 Legionella function 1…8 1 1 0/1 1 1 105 Legionella function (state / command) Setpoint legionella function 60…95 °C 1/64 1 106 D.h.w. priority 0…4 1 1 107 0…40 min 1 1 108 Overrun time charging pump M3 Overrun time charging pump (M7 in the secondary d.h.w. circuit, after M3) D.H.W.
128 Dwelling time at legionella setpoint Dwelling time at legionella setpoint (state / command) Circulating pump operation during legionella function Resolution 127 Range Slope Operating line number Modbus address Dec (hex) 270 (0x010E) 271 (0x010F) 272 (0x0110) Parameter 10…360 min 1 10 0/1 1 1 0/1 1 1 1/64 0.5 1/64 0.5 Solar d.h.w.
295 (0x0127) 296 (0x0128) 297 (0x0129) 217 222 Maximum refill time per charging cycle Maximum refill time per charging cycle (state / command) Maximum refill time per week Maximum refill time per week (state / command) Reset of the meters "Refill time per charging cycle“ and "Refill time per week“ (state / command) Heating circuit time switch program, read-write 600 Monday, heating period 1, 7 (0x0258) start, hour 601 Monday, heating period 1, (0x0259) start, minute 602 Monday, heating period 1, 8 (0x02
7 8 9 10 11 12 7 8 9 10 11 12 7 8 Resolution 12 Range Slope Operating line number Modbus address Dec (hex) 622 (0x026E) 623 (0x026F) 624 (0x0270) 625 (0x0271) 626 (0x0272) 627 (0x0273) 628 (0x0274) 629 (0x0275) 630 (0x0276) 631 (0x0277) 632 (0x0278) 633 (0x0279) 634 (0x027A) 635 (0x027B) 636 (0x027C) 637 (0x027D) 638 (0x027E) 639 (0x027F) 640 (0x0280) 641 (0x0281) 642 (0x0282) 643 (0x0283) 644 (0x0284) 645 (0x0285) 646 (0x0286) 647 (0x0287) 648 (0x0288) 649 (0x0289) 650 (0x028A) 651 (0x02
10 11 12 7 8 9 10 11 12 7 8 9 10 11 Resolution 9 Range Slope Operating line number Modbus address Dec (hex) 652 (0x028C) 653 (0x028D) 654 (0x028E) 655 (0x028F) 656 (0x0290) 657 (0x0291) 658 (0x0292) 659 (0x0293) 660 (0x0294) 661 (0x0295) 662 (0x0296) 663 (0x0297) 664 (0x0298) 665 (0x0299) 666 (0x029A) 667 (0x029B) 668 (0x029C) 669 (0x029D) 670 (0x029E) 671 (0x029F) 672 (0x02A0) 673 (0x02A1) 674 (0x02A2) 675 (0x02A3) 676 (0x02A4) 677 (0x02A5) 678 (0x02A6) 679 (0x02A7) 680 (0x02A8) 681 (0x0
– Resolution 12 Range Slope Operating line number Modbus address Dec (hex) 682 (0x02AA) 683 (0x02AB) 684 (0x02AC) Parameter Sunday, heating period 3, end, hour Sunday, heating period 3, end, minute Heating circuit time switch program, validation (state / command) 0…24 h 1 1 0…50 min 1 10 0/1 1 1 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1 0…50 min 1 10 0…24 h 1 1
19 20 21 22 23 18 19 20 21 22 23 18 19 20 Resolution 18 Range Slope Operating line number Modbus address Dec (hex) 724 (0x02D4) 725 (0x02D5) 726 (0x02D6) 727 (0x02D7) 728 (0x02D8) 729 (0x02D9) 730 (0x02DA) 731 (0x02DB) 732 (0x02DC) 733 (0x02DD) 734 (0x02DE) 735 (0x02DF) 736 (0x02E0) 737 (0x02E1) 738 (0x02E2) 739 (0x02E3) 740 (0x02E4) 741 (0x02E5) 742 (0x02E6) 743 (0x02E7) 744 (0x02E8) 745 (0x02E9) 746 (0x02EA) 747 (0x02EB) 748 (0x02EC) 749 (0x02ED) 750 (0x02EE) 751 (0x02EF) 752 (0x02F0) 7
22 23 18 19 20 21 22 23 18 19 20 21 22 23 Resolution 21 Range Slope Operating line number Modbus address Dec (hex) 754 (0x02F2) 755 (0x02F3) 756 (0x02F4) 757 (0x02F5) 758 (0x02F6) 759 (0x02F7) 760 (0x02F8) 761 (0x02F9) 762 (0x02FA) 763 (0x02FB) 764 (0x02FC) 765 (0x02FD) 766 (0x02FE) 767 (0x02FF) 768 (0x0300) 769 (0x0301) 770 (0x0302) 771 (0x0303) 772 (0x0304) 773 (0x0305) 774 (0x0306) 775 (0x0307) 776 (0x0308) 777 (0x0309) 778 (0x030A) 779 (0x030B) 780 (0x030C) 781 (0x030D) 782 (0x030E) 7
Switching program for d.h.w. validation (state / command) Resolution – Range Slope Operating line number Modbus address Dec (hex) 784 (0x0310) Parameter 0/1 1 1 1/64 1 – 1 1 0 = max. limitation OFF / deactivate limitation 1 = max. limitation ON / activate limitation 0…40 1 1 –50…50 °C 1/64 1 0…140 °C 1/64 1 0/1 1 1 0…60 min 1 1 0.5…50.0 °C 1/64 0.
Slope Resolution Operating line number Modbus address Dec (hex) Range 1…247 1 1 Modbus (status) 0/1 1 1 Parameter Explanations, notes and tips Modbus parameter, read only 1015 (0x03F7) 1016 (0x03F8) 1017 (0x03F9) 171 172 Parity 0…2 1 1 1018 (0x03FA) 173 Baud rate 0…4 1 1 1019 (0x03FB) 174 Modbus version 0…32767 1/10 0.1 1 = unit 1 2 = unit 2, etc.
Range Slope Resolution Operating line number Modbus address Dec (hex) 1030 (0x0406) 1031 (0x0407) Parameter 0/1 1 1 – Manual operation 50 Faults 0…255 1 1 1032 (0x0408) 143 Display of active limitations 0…255 1 1 1033 (0x0409) 251 Locking on the hardware side 0/1 1 1 1034 (0x040A) 1035 (0x040B) 1036 (0x040C) 1037 (0x040D) 1038 (0x040E) 1039 (0x040F) 1040 (0x0410) – Relay contact Y1 0/1 1 1 – Relay contact Y2 0/1 1 1 – Relay contact Q1 0/1 1 1 – Relay contact Q3/Y
Resolution 1066 (0x042A) Slope 1057 (0x0421) 1058 (0x0422) 1059 (0x0423) 1060 (0x0424) 1061 (0x0425) 1062 (0x0426) 1063 (0x0427) 1064 (0x0428) 1065 (0x0429) Operating line number Modbus address Dec (hex) 1041 (0x0411) 1042 (0x0412) 1043 (0x0413) 1044 (0x0414) 1045 (0x0415) 1046 (0x0416) 1047 (0x0417) 1048 (0x0418) 1049 (0x0419) 1050 (0x041A) 1051 (0x041B) 1052 (0x041C) 1053 (0x041D) 1054 (0x041E) 1055 (0x041F) 1056 (0x0420) – Relay contact K6 0/1 1 1 – Relay contact K7 0/1 1 1 146 Status at
Slope Resolution Operating line number Modbus address Dec (hex) 1067 (0x042B) – Attributes, heating circuit setpoint 0…32767 1 1 1068 (0x042C) 1069 (0x042D) – D.h.w. setpoint 0…140 °C 1/64 1/64 – Attributes, d.h.w. setpoint 0…32767 1 1 Parameter Range Explanations, notes and tips Bit0: Valid Bit1: System pump Bit2: Output priority Bit3: Shifting priority Bit4: Maximum limitation Bit5: Minimum limitation Bit6: D.h.w.
21 Function block Solar d.h.w. heating With plant types no. 2, 3, 6, 7 and 8, the RVD140 supports solar d.h.w. heating. The function is activated • on operating line 98 by selecting the d.h.w. sensor and • on operating line129 or 130 by parametrizing one of the two multifunctional relays This always enables solar d.h.w. charging, carried out via the collector pump based on the temperature differential between d.h.w. storage tank and collector temperature.
21.2 Functions 21.2.1 Temperature differential ON/OFF solar Operating lines 201 and 202 allow for setting the temperature differential to enable or disable solar d.h.w. charging. A sufficiently large temperature differential between collector and d.h.w. storage tank must exist for storage tank charging; in addition, the collector must have reached a minimum charging temperature.
21.2.3 Minimum running time When the collector pump is switched on, it remains on for a minimum running time of tMin = 20 s. This minimum running time is enabled for all functions activating the collector pump.
21.2.5 Collector temperature to protect against overheating Operating line 204 allows for setting the temperature protecting the collector against overheating. If there is a risk of overheating at the collector, storage tank charging is continued beyond the charging temperature maximum limitation (set on operating line 206) to the storage tank temperature maximum (set on operating line 207) to reduce the amount of surplus heat.
2541D10 2K 1K 1K TRk ON OFF SDON TRk TSp TKol Temperature differential ON Recooling setpoint Storage tank temperature Collector temperature ON/OFF Collector pump T Temperature t Time • The collector pump is switched on if the storage tank temperature lies at least 2 K above the recooling setpoint and above the collector temperature by temperature differential ON.
21.2.8 Maximum limitation of the charging temperature Operating line 206 allows for setting the maximum limitation for the charging temperature. The collector pump is switched off when the maximum charging temperature in the storage tank is reached.
22 Function block Refill function 22.1 Fundamentals The RVD140 supports the refill function, aimed at maintaining the plant pressure on the secondary side. If this pressure drops below a minimum level, water from the primary side or from an external tank is added to the secondary plant circuit, thus increasing the pressure again. Local regulations and the regulations released by the district heat utility must be observed.
22.3 Mode of operation Primary pressure 2510D03 22.3.1 Overview of functions Secondary pressure Switching differential Relative secondary minimum pressure Refill valve Reset Alarm: Maximum refill period per charge Minimum secondary underpressure period Refill locking time after shut down Maximum period per refill Time 22.3.
22.3.6 Function of primary pressure sensor U2 The function of primary pressure sensor U2 is to be selected on operating line 215. The refill function requires at least 1 sensor: The secondary pressure sensor (U1).
23 Function block Locking functions 23.1 Operating lines Line Function 226 227 228 Max. limitation of primary return temperature, constant value Max. limitation of primary return temperature, slope Max. limitation of primary return temperature slope, start of shifting limitation Max. setpoint of return temperature with d.h.w. heating Integral action time, primary return temperature limitations Max. limitation of temperature differential Max. setpoint of the return temperature during d.h.w.
23.3.
23.4 Maximum limitation of the return temperature differential (DRT) With plant types no. 1 through 4, and 6 and 7, the return temperature differential (difference between primary return and secondary return temperature) can be limited to a maximum, provided the necessary sensor B71 is installed in the heating circuit’s secondary return. If the differential of the 2 return temperatures exceeds the set maximum limit value, two-port valve Y1 in the primary circuit is throttled.
23.6 Raising the reduced room temperature setpoint The reduced room temperature setpoint can be raised as the outside temperature falls. This ensures that • at low outside temperatures, the required change from the reduced setpoint to the nominal setpoint will not become too great • no peak load will occur during the heating up phase The reduced room temperature setpoint is only raised at outside temperatures below 5 °C. This is not required at higher outside temperatures.
23.8.2 Parameters The waiting time can be adjusted in the range from 3…255 minutes, that is, during the time between 2 valve opening actions (increment of 10 minutes, operating line 238). Fixed settings: • Opening time: 30 seconds • Stroke: 25 % • Switch-off temperature (only if sensor B7 is present); it lies 5 °C below the d.h.w. setpoint 23.8.3 Mode of operation Cooling down is prevented by opening the two-port valve in the primary circuit at regular intervals, using fixed settings.
24 Combination with PPS units 24.1 General • PPS units are digital devices for connection to the controller’s PPS (point-to-point interface, terminals A6–MD): − Room units QAA50.110/101 and QAW70 • The room temperature acquired with the room unit is adopted by the controller. If it shall not be considered by the various control functions, the room authority must be set to zero. The other room unit functions will then be maintained • If an inadmissible unit is used, the RVD120/140 indicates an error.
The action of the QAW’s operating mode slider on the RVD120/140 is as follows: Operating mode QAA50.110/101 Operating mode of RVD120/140 Automatic operation, temporary overriding possible with the QAA50.110/101’s economy button Economy button off (lit): Normal temperature Economy button on (not lit): Reduced temperature Standby If the room unit overrides the controller’s operating mode, the controller’s operating blinks. mode button 24.2.3 Readjustment of the room temperature The knob of the QAA50.
24.3.2 Overriding the operating mode The operating mode of the RVD120/140 can be overridden from the QAW70, using the unit’s operating mode button and economy button. To permit overriding, the RVD120/140 must be in automatic operation.
• If the time of day or the heating program is changed on the room unit, the change is also be adopted by the controller • If the time of day or the heating program is changed on the controller, the change is also be adopted by the room unit For more detailed information, refer to the Installation Instructions of the QAW70 (G1637). 24.3.5 Entry of holiday periods Using the QAW70 room unit, the controller can be switched to holiday mode. To be entered is the length of the holiday period in days.
25 Manual operation During commissioning or in the event of fault, manual operation enables the heating plant to be controlled manually. Using the 2 setting buttons, two-port valve Y1 in the primary return can be driven into any position. The heating circuit pump, the d.h.w. pump(s) and the collector pump run. The electric immersion heater is released; the refill valve remains closed (currentless). The controller’s display shows the flow temperature (sensor B1). With plant types no.
26 Handling 26.1 Operation 26.1.1 General Operating elements 1 5 1 2 5 2 6 7 3 8 1 7 6 7 °C 6 Prog 3 20 16 12 4 24 7 Front of the RVD140 1 2 3 4 5 6 7 Operating mode buttons Display (LCD) Line selection buttons for selecting the operating lines Button for manual operation ON/OFF Button for d.h.w.
Operating instructions Operating instructions are inserted at the rear of the front cover. They are designed for janitors and end-users. They also contain tips on energy saving and fault tracing. 26.1.2 Analog operating elements Buttons and displays for selecting the operating mode The following operating mode buttons are available: • 3 buttons for selecting the heating circuit’s operating mode • 1 button for d.h.w. heating The required operating mode is activated by pressing the respective button.
26.1.4 Controller in ”non-operated state” The controller assumes the ”non-operated state” when, during the last 8 minutes, none of the buttons has been pressed or, previously, one of the operating mode buttons has been pressed. In the ”non-operated state”, the time of day and all actual values can be viewed by pressing the setting buttons . The codes of the actual values are identical and with those on operating line 141. Any active limitations are indicated by or depending on the priority.
26.2.2 Operating lines Operating line ”Plant type” • When commissioning the plant, the most important job is entry of the required type of plant. When entering the plant type, all relevant functions and settings are activated • Additional configurations required: − Space heating: Present or not present − With plant types no. 4, 6 and 7: Use of universal sensor B71 − With plant types no.
26.3 Mounting 26.3.1 Mounting location Suitable mounting locations are compact stations, control panels, control desks or the heating room. Not permitted are wet or damp locations.
27 Engineering 27.1 Connection terminals RVD120 MD F3 Q1 Q3 Y7 F1 RVD140 MD F1 Low voltage side A+ B– A6 MD B9 B1 M B3 F3 Q1 Q3 Y7 F4 Modbus Modbus Room unit/room sensor (PPS) Ground PPS (digital) Outside sensor Flow sensor Ground sensors (analog) D.h.
27.3 Low-voltage side L Connection diagrams RVD120 Modbus RTU RS485 (EIA-485) AC 230 V * A+ B- * Terminating resistor 150 Ω (0.5 W) for the first and last device on the bus. See Modbus specification for details B3 N L Modbus RTU RS485 (EIA-485) A6 B9 B1 B71 B6 B32 RVD140 H5 AC 230 V * A+ B- B6 B3 B32 U2 M U1 H5 N2 N Mains voltage side RVD120 (plant types no.
28 Mechanical design 28.1 Basic design The RVD120/140 are comprised of controller insert, which houses the electronics, the power section, the relays and all operating elements (on the controller front), and the base, which carries the connection terminals. The RVD120 contains 4 relays, the RVD140 contains 9. The operating elements are located behind a cover. At the rear of the cover, there is a slot where the Operating Instructions can be inserted.
29 Technical data For the technical data please refer to the datasheet N2510.
Index A Actuator running time .......................................... 48, 64 Adaptation to the time of year ................................... 60 Adjustable load limit .................................................. 60 Adjustment .............................................................. 107 Analog operating elements ..................................... 107 Attenuated outside temperature................................ 35 Attenuated outside temperature (ECO) ....................
Forced charging ........................................................99 Frost protection for the d.h.w.....................................52 Frost protection for the house or building ..................44 Frost protection for the plant .....................................44 Frost protection function solar ...................................89 Function block Clock settings.......................................................29 D.h.w. heating ......................................................50 D.
P Panel cutout ............................................................ 110 Parallel displacement................................................. 41 Parameter reset ........................................................ 68 Parity Modbus ........................................................... 69 P-band ................................................................ 48, 64 PI control ................................................................... 41 Plant type no. 1 ...........................
Summer / winter function...........................................43 Summer operation .....................................................55 Summertime ..............................................................29 Swinging lever .........................................................113 Switching the d.h.w. heating on / off..........................52 U Unit address Modbus ................................................ 69 Use of controller .....................................................
/120 Siemens Building Technologies District heating controller RVD120, RVD140 Index CE1P2510en 2018-04-30
Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Theilerstrasse 1a CH-6300 Zug Switzerland Tel. +41 58-724 24 24 © Siemens Switzerland Ltd 2009 Delivery and technical specifications subject to change www.siemens.
