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Siemens RVD240, Basic Documentation

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Siemens Building Technologies 

Basic documentation RVD240 

CE1P2384en 

HVAC Products 

22 Function block Device functions 

27.05.2004 

With plant types x–4, this function is required to detect bottlenecks in the heat supply 
from the district heat network. Undertemperature supervision triggers an error message 
when, for a defined period of time during a demand for heat, the flow temperature falls 
below the flow temperature setpoint by more than 10 K. This period of time can be set 
on operating line 143. The flow alarm becomes inactive as soon as the limit is ex-
ceeded again.  
Flow alarm for undertemperature supervision: 

t

T

V

w

x

23

83D

07

t

A

t

1

t

2

ERROR

 

t Time 

T

V

 Flow 

temperature 

t

1

 

Start of ERROR display 

w 

Setpoint 

t

2

 

End of ERROR display 

x 

Actual value 

t

A

 

Waiting time (set on operating line 143) 

 

"Forbidden” range 

 

The flow alarm appears on the display as ERROR and, on operating line 50, with error 
code 123.  
The flow alarm can be deactivated by entering --:-- . 

22.5  Winter- / summertime changeover 

 

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 144 and 145. The entry to be made is the earliest possible changeover 
date. The weekday on which changeover occurs is always a Sunday.  
 
If the start of summertime is given as "The last Sunday in March", the earliest possible 
changeover date is March 25. The date to be entered on operating line 144 is then 
25.03.  
If no summer- / wintertime changeover is required, the 2 dates are to be set so that 
they coincide. 

Undertemperature 
supervision 

Example 

Summary of Contents for RVD240

Page 1: ...Edition 3 0 Controller series D CE1P2384en 27 05 2004 Siemens Building Technologies HVAC Products RVD240 District Heating and Domestic Hot Water Controller Basic Documentation ...

Page 2: ...cumentation RVD240 CE1P2384en HVAC Products 27 05 2004 Siemens Building Technologies AG HVAC Products Gubelstrasse 22 CH 6301 Zug Tel 41 41 724 24 24 Fax 41 41 724 35 22 www landisstaefa com 1999 Siemens Building Technologies AG Subject to change ...

Page 3: ... 2 4 Heating circuit functions 15 2 5 D h w functions 16 2 6 Auxiliary functions 16 3 Fundamentals 18 3 1 Key technical features 18 3 1 1 Function blocks 18 3 1 2 Plant types 18 3 2 Operating modes 22 3 2 1 Heating circuit control 22 3 2 2 D h w heating 23 3 2 3 Manual operation 23 4 Acquisition of measured values 24 4 1 General 24 4 2 Flow temperature heating circuit 24 4 2 1 Types of sensors 24 ...

Page 4: ...aults 27 5 Function block Space heating 28 5 1 Operating lines 28 5 2 Settings and displays 28 5 3 Heating program 29 6 Function block Clock settings 30 6 1 Operating lines 30 6 2 Entries 30 7 Function block End user d h w 31 7 1 Operating lines 31 7 2 D h w heating program 31 7 3 Adjustment of setpoints 31 8 Function block Display of actual sensor values 32 8 1 Operating lines 32 8 2 Displays 32 ...

Page 5: ...compensated control 45 12 5 3 Weather compensated control with room influence 45 12 6 Automatic ECO function 46 12 6 1 Fundamentals 46 12 6 2 Compensating variables and auxiliary variables 46 12 6 3 Heating limit 47 12 6 4 Mode of operation of ECO function 1 47 12 6 5 Mode of operation of ECO function 2 47 12 7 Pump overrun 47 12 8 Maximum limitation of the room temperature 47 12 9 Optimization 48...

Page 6: ...w temperature 56 14 5 Minimum limitation of the flow temperature 57 15 Function block D h w heating 58 15 1 Operating lines 58 15 2 Release of d h w heating 58 15 3 Control of the circulating pump 59 15 4 Switching differential of d h w control 59 15 5 Legionella function 59 15 6 Priority of d h w heating 59 15 6 1 General 59 15 6 2 Absolute priority 60 15 6 3 Shifting priority 60 15 6 4 No priori...

Page 7: ...erating lines 69 17 1 1 Legionella function 69 17 1 2 Setpoint 69 17 1 3 Time 69 17 1 4 Dwelling time 69 17 1 5 Operation of circulating pump 70 17 1 6 Maximum limitation of the return temperature 70 17 2 Mode of operation 70 18 Function block Valve actuator d h w 72 18 1 Operating lines 72 18 2 Mode of operation 72 18 3 Control process 72 18 4 Setpoint boost 72 18 4 1 Charging boost 73 18 4 2 Flo...

Page 8: ...on with outside sensor 80 22 3 3 Mode of operation without outside sensor 81 22 3 4 Frost protection for the heating circuit flow 81 22 4 Flow alarm 81 22 4 1 Heating circuit and d h w circuit with storage tanks 81 22 4 2 Direct d h w heating via heat exchanger 82 22 5 Winter summertime changeover 83 23 Function block M bus parameter 84 23 1 Operating lines 84 23 2 General 84 23 3 Addressing and i...

Page 9: ...n time of the limitation functions 94 27 Function block Various functions 95 27 1 Operating lines 95 27 2 Limitation function at contact H5 95 27 3 Suppression of hydraulic creep 96 27 3 1 Mode of operation 96 27 3 2 Mode of operation 96 27 4 Raising the reduced room temperature setpoint 96 28 Function block Operation locking functions 98 28 1 Operating lines 98 28 2 Locking settings on the softwa...

Page 10: ... nonoperated state 106 31 1 5 Safety concept 106 31 1 6 Setting levels and access rights 106 31 2 Commissioning 107 31 2 1 Installation instructions 107 31 2 2 Operating lines 107 31 3 Installation 107 31 3 1 Mounting location 107 31 3 2 Mounting choices 107 31 3 3 Electrical installation 108 32 Engineering 109 32 1 Connection terminals 109 32 2 Relays 110 32 3 PWM output 110 32 4 Lightning protec...

Page 11: ...hanger that delivers the heat directly to the consumers e g space heating d h w heat ing etc Term Explanation Storage tank charging pump Pump that supplies tap water via the heat ex changer into the storage tank where it is made available as d h w Intermediate circuit pump Pump that supplies water as a heat carrier The water transfers its heat via a coil or storage tank to the d h w without gettin...

Page 12: ...12 126 Siemens Building Technologies Basic documentation RVD240 CE1P2384en HVAC Products Glossary 27 05 2004 ...

Page 13: ...gned for the following types of applica tions D h w heating with coil type storage tanks D h w heating with stratification storage tanks Direct d h w heating via heat exchanger Common or separate heat exchangers for the heating circuit and d h w heating Two stage separation of the d h w from district heating The RVD240 is suited for the control of 2 port and 3 port valves and pumps includ ing vari...

Page 14: ...s All actuators from Siemens with the following features can be used Electric or electrohydraulic actuators with a running time of 10 900 seconds 3 position control Operating voltage AC 24 V AC 230 V 1 3 4 Communication Communication with other devices controllers etc is possible Via LPB e g assignment of d h w reception of radio signal master slave assign ments for the time switch reception of ou...

Page 15: ...tems such as Radiators Convectors Underfloor heating systems Ceiling heating systems Radiant panels 2 4 Heating circuit functions The RVD240 is used if 1 or several of the following heating circuit functions is are required Weather or room compensated or weather and room compensated flow tempera ture control Separate flow temperature control of both heating circuits Flow temperature control throug...

Page 16: ... w heating with mixing valve Flow switch with an adjustable load limit child proofing and adaptation to the season Own time program for the release of d h w Optional assignment of the circulating pump to the heating circuit or the d h w circuit time program Protection against cooling down with d h w heating via heat exchanger Legionella protection Forced d h w charging frost protection for d h w S...

Page 17: ... Building Technologies Basic documentation RVD240 CE1P2384en HVAC Products 2 Use 27 05 2004 Relay test Display of setpoint Display of all active limitations Locking of settings Connection of sensors for display only ...

Page 18: ...S parameter Heating engi neer Test and display DRT and limitation of the return temperature Various functions Locking func tions Locking functions For each function block the required settings are available in the form of operating lines On the following pages a description of the individual functions per block and line is given 3 1 2 Plant types The RVD240 has 14 plant types preprogrammed the fun...

Page 19: ...imary return Y7 2 port valve primary return heating circuit 2 B12 Y7 Y5 B72 Q2 A6 2384S03 B3 H5 B71 Q3 Y1 B7 B1 Q1 B9 A6 B32 A6 Room units B1 Flow sensor heating circuit 1 B12 Flow sensor heating circuit 2 B3 D h w flow sensor B32 Return sensor d h w B7 Primary return sensor heating circuit 1 B71 Primary return sensor d h w circuit B72 Primary return sensor heating circuit 2 B9 Outside sensor H5 F...

Page 20: ... B1 B31 2384S07 B71 B71 B32 A6 B12 Q2 Y5 Q1 A6 B72 A6 Room units B1 Common flow sensor B12 Flow sensor heating circuit 2 B31 Storage tank sensor 1 B32 Storage tank sensor 2 B7 Common primary return sensor B71 Sensor common secondary return or return sensor d h w circuit only if Q3 is speed controlled B72 Return sensor heating circuit 2 B9 Outside sensor K6 Circulating pump optional Q1 Pump heating...

Page 21: ...B9 Q Q3 Y1 B7 B1 B31 2384S11 B71 B71 B32 A6 B3 Q2 Y7 A6 B12 Q1 Y5 B72 B71 A6 Room units B1 Common flow sensor B12 Flow sensor heating circuit 1 B3 Flow sensor heating circuit 2 B31 Storage tank sensor 1 B32 Storage tank sensor 2 B7 Common primary return sensor B71 Sensor common secondary return or return sensor heating circuit 2 or return sensor d h w circuit only if Q3 is speed controlled B72 Ret...

Page 22: ...B71 Sensor common secondary return heating circuit or return sensor heating circuit 2 B72 Return sensor primary d h w circuit B9 Outside sensor Q Circulating pump controlled externally optional Q1 Pump heating circuit 1 Q2 Pump heating circuit 2 Q3 D h w intermediate circuit pump Y1 2 port valve common heating circuit flow Y5 2 port valve d h w primary return Y7 Mixing valve heating circuit 2 a Ci...

Page 23: ...f the heating circuit s operating mode and control no d h w heating during holiday pe riods OFF button dark no d h w The circulating pump switches off Frost protection is ensured 3 2 3 Manual operation No control All pumps are in operation The 2 port valve in the primary circuit can be manually adjusted with set ting buttons For more detailed information refer to chapter 30 Manual operation ...

Page 24: ...be activated and the primary mixing valve driven to the fully closed position in the case of a mixing circuit and the heating circuit pump will be deactivated in the case of a pump circuit In all cases a fault status signal will be generated This means The controller s LCD displays Er When querying the flow temperature on the QAW70 room unit if present its display shows if there is a short circuit...

Page 25: ...QAW50 03 or QAW70 The second room unit must then be a QAW50 03 or QAW70 addressed with 2 4 4 2 Handling faults A short circuit in the measuring circuit leads to an error message An open circuit in the measuring circuit does not lead to an error message since it is not possible to have a room unit connected If the room unit detects a fault in the room temperature measurement short circuit or open c...

Page 26: ...shows in both cases if there is a short circuit or open circuit 4 6 D h w storage tank temperature B31 4 6 1 Measured variable The storage tank temperature is always acquired at input B31 Depending on the type of plant it is possible to use a second storage tank sensor B32 4 6 2 Types of sensors The type of sensor is the QAE22 immersion sensor with a sensing element LG Ni 1000 Thermostats cannot b...

Page 27: ... h w applications is the immersion temperature sensor QAE2 Its sensing range is 0 130 C Commercially available immersion temperature sensors with a sensing element Pt 500 The sensing range of all types is 0 180 C The controller automatically identifies the type of sensor used 4 8 3 Handling faults In the event of a faulty primary return temperature sensor short circuit or open circuit an error mes...

Page 28: ...uring the heating periods In continuous operation always On operating line 1 the LCD shows the current room temperature setpoint of each heating circuit Depending on the operating mode and the operating state the room temperature setpoint can be Operating mode and operat ing state Displayed setpoint Heating to the nominal set point Adjustment made with the setting knob incl the readjustment made o...

Page 29: ...for frost protection operation are to be entered directly in C room temperature They are independent of whether or not the control uses a room sensor When using no room temperature sensor the heating curve or the room model will be considered 5 3 Heating program The heating program of the RVD240 provides a maximum of 3 heating periods per day also every weekday can have different heating periods E...

Page 30: ... setting Range 13 Time of day hh mm Undefined 00 00 23 59 14 Weekday d 1 1 7 15 Date dd MM 01 01 01 01 31 12 16 Year yyyy 1995 1995 2094 6 2 Entries The RVD240 has a yearly clock with the time of day the weekday and the date The changeover from summer to wintertime and vice versa takes place automatically Should the respective regulations change the changeover dates can be adjusted refer to operat...

Page 31: ... Every release period is defined by a start and an end Using 1 7 on operating line 17 it is possible to enter a d h w heating program that applies to all weekdays This simplifies the settings if the weekend times are different first enter the times for the entire week then change days 6 and 7 as required The settings are sorted and overlapping release periods combined By setting at the start or at...

Page 32: ...e displayed temperature is delivered by the analog outside sensor connected to B9 or via data bus refer to subsection 20 2 4 Outside temperature source If buttons and are pressed for 3 seconds the displayed outside temperature will be adopted as the composite and the attenuated outside temperature outside temperature reset D h w temperature The temperature displayed is that measured with the d h w...

Page 33: ...t day of the holiday period changeover to the setpoint for frost protection holiday mode takes place At 24 00 of the last day of the holiday period the controller will change to normal or reduced heating in accordance with the time switch settings The settings of each holiday period will be cleared as soon as the respective period has elapsed Holiday periods may overlap It is not necessary to obse...

Page 34: ...ting circuit 1 62 Unit with wrong PPS identification connected heating circuit 1 66 Error room unit heating circuit 2 67 Unit with wrong PPS identification connected heating circuit 2 81 Short circuit on data bus LPB 82 2 units with the same bus address LPB 86 Short circuit PPS 100 2 clock time masters 120 Flow alarm common flow temperature 121 Flow alarm heating circuit flow heating circuit 1 122...

Page 35: ... plant is to be entered on operating line 51 The plant types have the following features The RVD240 has a total of 14 plant types preprogrammed For detailed information refer to subsection 3 1 2 Plant types Plant types x 0 only provide flow temperature control in the heating circuits d h w heating is not possible In terms of space heating it is possible to have mixing or pump heating circuits The ...

Page 36: ...d on operating line 56 1 acting only on heating circuit 1 2 acting only on heating circuit 2 3 acting on both heating circuits With the other plant types the function always acts on 2 port valve Y1 in the pri mary return For more detailed information refer to chapter 27 Function block Various func tions operating lines 181 through 183 2 reception of heat demand signals for more information refer t...

Page 37: ...on operating line 59 If due to the hydraulic layout the maximum pump head must be reduced this should be done via a reduction of the maximum pump speed since this saves pump ing power If the pump may operate at nominal capacity the maximum speed is to be main tained at 100 The setting range reaches from the value set on operating line 58 to 100 The following illustration shows the control of the h...

Page 38: ...an Energy savings due to reduced pumping power Greater differential between heating flow and return temperature Lower return temperatures The heating circuit is controlled based on the signal received from the heating circuit flow sensor Setting of the maximum flow temperature operating line 95 defines the maximum flow temperature setpoint on the one hand On the other the same setting defines the ...

Page 39: ...tpoints and actual values are used Plant type Actual value sensor Setpoint 2 1 3 1 2 2 B71 Maximum setpoint of the return temperature during d h w heating minus differential to the primary limit value with maximum limitation of the secondary return temperature 1 3 1 9 B71 4 9 B72 Maximum setpoint of the return temperature with d h w heating Setting value operating line 176 Setting value operating ...

Page 40: ...ctions of the control system if the outside temperature changes for short periods of time In the case of the weather compensated control without or with room influence the RVD240 uses the composite outside temperature The building time constant is a measure of the type of building construction and indi cates how quickly the room temperature would change if the outside temperature suddenly changed ...

Page 41: ...m temperature influ ence it is an additional compensating variable The gain factor for the room temperature influence can be adjusted operating line 70 This factor indicates to what extent a deviation in the room changes the room tempera ture setpoint thus having an indirect impact via the slope on the flow temperature control 0 room temperature deviations have no impact on the generation of the s...

Page 42: ...g circuit is to be set separately on operating line 5 TAM TV s 2381D05 110 100 90 80 70 60 50 40 30 20 20 15 10 5 0 5 10 15 20 25 30 35 40 35 32 5 30 27 5 25 22 5 20 17 5 15 12 5 10 7 5 5 2 5 Heating curve s Slope TAM the composite outside temperature TV Flow temperature The heating curve has a fixed tilting point at an outside temperature of 22 C and a flow temperature of 20 C It can be set aroun...

Page 43: ... heating circuits is determined either by weather compensation weather compensation with room influence or room compensation 12 4 1 Display of setpoint The effective setpoint generated by the controller as a result of the different influencing factors can be displayed on operating line 27 by keeping button or depressed 12 4 2 Setpoint of weather compensated control The setpoint is generated via th...

Page 44: ... Limiter Operating line 70 Setting the gain factor for room influence s Heating curve slope Operating line 71 Setting the parallel displacement of the heating curve 12 4 4 Setpoint of weather compensated control with room influence Here in addition to the outside temperature and the room temperature setpoint the heating curve and the room influence act on the flow temperature setpoint 2381B03 E H ...

Page 45: ...tpoint generation When there is no room temperature deviation the controller maintains the flow tem perature setpoint generated by the heating curve slope at an outside temperature of 0 C Any room temperature deviation produces an instant parallel displacement of the set heating curve The correlation between the amount of the deviation and the extent of the displacement is defined by the room infl...

Page 46: ...unction acts separately on both heating circuits Action of the automatic ECO function means Heating circuit pump OFF it can only be activated by frost protection for the plant Heating circuit mixing valve CLOSED In the individual operating modes the automatic ECO function behaves as follows Operating mode Automatic ECO function is Automatic operation active Continuous operation inactive Standby ac...

Page 47: ...e switching differential The heating limit is determined as follows Heating limit TRwN TECO nominal room temperature setpoint plus ECO temperature A nominal room temperature setpoint wN of 20 C and an ECO temperature TECO of 5 K result in a heating limit of 15 C 12 6 5 Mode of operation of ECO function 2 ECO function 2 operates as an automatic 24 hour heating limit The heating will be switched off...

Page 48: ...mum limit value for optimum shutdown Operating line 78 Quick setback yes or no To perform the optimization function the controller makes use of the actual room tem perature acquired by a room temperature sensor or room unit or the room model An outside sensor is always required Using a room sensor or room unit it is possible to have optimum start and optimum stop control To be able to optimally de...

Page 49: ... room model a distinction must be made between two cases The RVD240 is not in quick setback mode The room temperature generated by the room model is identical to the current room temperature setpoint The RVD240 is in setback mode The room temperature generated by the room model is determined according to the following formula t Room model temperature TRM TRw TAM e 3 kt TAM 2522D18 t1 TRw TRM TRw T...

Page 50: ...value is simulated by the room model The duration is determined according to the following formula TRw TAM t 3 kt ln TRw TAM ln Natural logarithm kt Building time constant h t Duration of quick setback h TAM Composite outside temperature TRw Setpoint of normal room temperature TRw Setpoint of reduced room temperature 12 9 7 Optimum start control During the building s non occupancy times the RVD240...

Page 51: ... 10 1 General Frost protection for the building acts separately on both heating circuits It makes cer tain that the room temperature will not fall below a certain level If the room temperature falls below the setpoint for frost protection the controller will maintain a room tempera ture equivalent to that setpoint plus the switching differential of 1 K For this purpose both the controller and the ...

Page 52: ...cked when d h w is heated or when the respective pump overrun is still in pro gress The pump kick will not be carried out later 12 11 2 Valve kick The valve kick function is activated every Friday after the pump kick The control outputs for the mixing valve actuators in the secondary circuits heating circuits d h w circuit are activated for 30 seconds one after the other that is the mix ing valve ...

Page 53: ...pump overrun is called for a maximum selection of the 2 overrun times is made in that case the longer overrun time applies ON OFF 0 t t 72 0 ON OFF ON OFF ON OFF w w Y ON Activation OFF Deactivation t Time t72 Overrun time operating line 72 w Setpoint Y Manipulated variable Plant types 1 4 and 4 4 do not respond to forced signals since heat is drawn from the heat source only when d h w is consumed...

Page 54: ...ter s primary return that is controlled This function block also provides minimum and maximum limitation of the flow tempera ture acquired with sensor B1 13 3 Control process If the actual flow temperature deviates from the setpoint 2 port valve Y1 offsets the deviation in a stepwise fashion The controller drives an electric or electrohydraulic actuator The ideal running time of the actuator is 2 ...

Page 55: ... 1 for example Plant types 2 x 3 x and 4 x Control of the heat converter s 2 port valve The function can be deactivated by entering On operating line 88 it is possible to select whether the external heat demand has ab solute priority setting 0 or whether a maximum selection is to be made between the external and the internal heat demand setting 1 13 7 External heat demand at input U1 Heat demand s...

Page 56: ...Y5 according to sensor B12 Control of valve Y7 according to sensor B3 The function block also provides minimum and maximum limitation of the flow tempera ture in the controlled heating circuit 14 3 Control process If the actual flow temperature deviates from the setpoint the mixing valve offsets the deviation in a stepwise fashion The controller drives an electric or electrohydraulic actuator The ...

Page 57: ...mperature The minimum limit value is to be set on operating line 96 The setting range for the minimum limit value lies between 8 C and the maximum limit value setting on operat ing line 95 At the limit value the heating curve runs horizontally This means that the flow tem perature setpoint cannot fall below the minimum value This function can be deactivated entry of on operating line 96 ...

Page 58: ...of charging pump min 1 00 0 10 40 00 109 Maximum time of d h w heating min 150 5 250 110 Protection against discharging during d h w pump overrun 0 0 1 15 2 Release of d h w heating The release of d h w heating can be selected on operating line 101 depending on the type of plant For the release of d h w heating there are 3 choices available Setting Release 0 D h w heating is always released 24 hou...

Page 59: ...elease 0 OFF during d h w heating 1 ON during d h w heating If the circulating pump is assigned to one or several heating programs it immediately starts running when the heating period begins When according to the d h w assign ment all heat consumers are in holiday mode the circulating pump will be deactivated For more detailed information refer to chapter 19 Function block Assignment of d h w Spe...

Page 60: ...eating circuits will be throt tled should d h w heating produce a shortage of heat Generation of the valid flow tem perature setpoint can be selected by making a setting on operating line 106 1 the flow temperature setpoint will be determined by the demand for d h w 2 the flow temperature setpoint will be determined by a maximum selection of the valid demands for heat In the case of shifting prior...

Page 61: ...ting on operating line 106 3 the flow temperature setpoint will be determined by the demand for d h w 4 the flow temperature setpoint will be determined by maximum selection of the valid demands for heat With plant types no 1 x and 4 x setting Maximum selection is inactive 15 7 Pump overrun 15 7 1 General To prevent heat from accumulating it is possible to select overrun of the intermediate circui...

Page 62: ...at least 5 C main tained Frost protection is ensured when d h w heating is ON operating mode button lit when d h w heating is OFF operating mode button dark when the holiday function is active in one of the heating circuits operating mode button flashes With all plant types x 4 frost protection for the d h w is not possible 15 9 Switching d h w heating off The d h w functions can be deactivated by...

Page 63: ...he op erating mode button for d h w heating for 3 seconds It also triggers d h w heating when d h w heating is not released the d h w temperature lies inside the switching differential also refer to forced charging the d h w operating mode is on standby holidays d h w heating OFF Operating mode D h w heating ON is switched on by activating manual d h w charg ing as an acknowledgement the LED in th...

Page 64: ...erature B1 falls by 2 K below the storage tank temperature In the case of two storage tank sensors the higher actual value applies With plant types x 8 and x 9 with a storage tank connected on the primary side pro tection against discharging is not required during charging 16 1 6 Protection against overtemperatures If the flow temperature is too high the heating circuit pump will overrun before d ...

Page 65: ...eeding of circulating water into the heat exchanger oper ating line 54 The following settings are available Setting Circulating pump Feeding the circulating water into Function action 0 No No control 1 Yes the storage tank No control no compensation of heat losses 2 Yes the heat exchanger 80 of the heat losses will be com pensated 3 Yes the heat exchanger Full compensation of heat losses constantl...

Page 66: ...4 4 With return sensor B72 in the primary d h w return This means that only one sensor is required for the maximum limitation of the return temperature and the cooling down protection But the function can also be provided without using a sensor Cooling down is prevented by primary valve Y5 in the primary d h w return which opens at regular intervals based on fixed settings This takes place when th...

Page 67: ... control shall also be active outside periods of d h w consumption that is whether heat losses due to radiation circulation etc shall be compensated for The configuration is to be made on operating line 54 If a flow switch is used the primary valve will temporarily be controlled by an opening signal at the beginning of d h w consumption and by a closing signal at the end of d h w consumption To en...

Page 68: ... h w flow temperature D h w setpoint TBWw 50 C Cold water temperature TNx 10 C fixed value Permissible reduction T 20 Minimum d h w flow temperature TBWV TBWV TBWw T TBWw TNx 50 0 2 50 10 42 C The aim is to maintain the d h w setpoint and all heat losses will be fully compensated for A circulating pump is used 16 3 7 Cold water sensor Cold water sensor B32 is fitted after the mixing point of cold ...

Page 69: ...or d h w heating 17 1 2 Setpoint The legionella setpoint can be adjusted in the range from 60 95 C operating line 105 In the case of storage tanks with 2 sensors the d h w temperature must reach the setpoint at both sensors 17 1 3 Time The legionella function is started at the set time If no time has been set operating line 126 the legionella function will be started with the first d h w release a...

Page 70: ...erature is acquired with 1 or 2 sensors legionella function cannot be provided when using thermostats The legionella function has been parameterized operating line 104 D h w heating is switched on button is lit The holiday function is not active If the criteria Set day and Time are met the legionella function will be released Re lease of the legionella function causes the d h w temperature setpoin...

Page 71: ...a functions 27 05 2004 If a maximum d h w charging time has been set it also acts here If the legionella set point is not reached the legionella function will be interrupted and resumed on comple tion of the maximum charging time The legionella setpoint will not be affected by the maximum of the d h w temperature setpoint ...

Page 72: ...ng unit 1 3 B71 Valve Y5 Primary return of d h w heat exchanger 2 2 B3 Mixing valve Y5 1 4 1 8 1 9 4 x B3 Valve Y5 D h w flow intermediate circuit 18 3 Control process If the flow temperature deviates from the setpoint the 2 port or mixing valve is adjusted in a stepwise fashion to compensate for the deviation with plant type 1 3 this can also be accomplished with 2 position control The controller...

Page 73: ...urn temperature with d h w charging 1 4 1 8 2 6 4 4 4 8 Reduced setpoint setting on operating line 42 Setting value on operating line 117 In any case the setting range is limited at a maximum of 100 C 18 6 D h w charging with two storage tank sensors With the plant types using a d h w storage tank the storage tank temperature can be acquired with one or 2 sensors B31 and B32 When using two storage...

Page 74: ... heat exchanger volumesecondary Load limit d h w consumption opening time design point Example of calculating the load limit to be set for a heat exchanger with the following characteristics Water content on the secondary side 1 0 liter Average d h w consumption 0 14 liters second Opening time of d h w actuator 35 seconds Design point 80 0 8 1 0 Load limit 0 14 35 0 8 100 25 This value is used as ...

Page 75: ...g circuits get their d h w from the same source With plant types x 0 this setting is not required since they provide no d h w heating Setting Explanation 0 The d h w is only provided for the heating circuit associated with the own controller 1 The d h w is only provided for the heating circuits of the controllers with the same segment number that are connected to the data bus LPB 2 The d h w is pr...

Page 76: ...th no bus both the device number and the segment number must be set to zero Since the device address is also associated with control processes it is not possible to permit all possible device addresses in all types of plant If an inadmissible address has been entered for the selected type of plant a fault status signal will appear error code 140 For detailed information about the addressing of dev...

Page 77: ...operating line 134 The current setting is shown on the left and the current bus power supply status on the right Display Automatic bus power supply on the controller Bus power supply currently present 0 0 No 0 1 Bus power supply is central no power supply via controller Yes A 0 No A 1 On decentral bus power supply by the controller Yes The word BUS appears on the display only when the bus address ...

Page 78: ...ritical locking signals are generated by the boiler controller with protective boiler startup or during minimum limitation of the boiler return temperature aimed at throttling the consumers to get out of the crucial range more quickly If the boiler controller is in segment 0 the critical locking signal will sent to all heat con verters and consumers in the entire bus system If the boiler controlle...

Page 79: ...l locking signals from the data bus The setting does not affect the response to controller internal locking signals Setting operating line 137 Response 0 Uncritical locking signals from the data bus will be ignored 1 Uncritical locking signals from the data bus will be adopted 21 3 2 Controller internal uncritical locking signals Controller internal uncritical locking signals always throttle the h...

Page 80: ...It can be deactivated on operating line 141 entry of 0 22 3 Frost protection for the plant 22 3 1 Principle Frost protection for the plant protects both heating circuits against freeze ups by acti vating the respective heating circuit pump For this purpose both the controller and the heat source must be ready to operate mains voltage present Frost protection for the plant is possible with or witho...

Page 81: ... switch off criterion will be active for a minimum of 5 minutes 22 4 Flow alarm 22 4 1 Heating circuit and d h w circuit with storage tanks The purpose of this function is to detect bottlenecks in the heat supply of the district heat network The flow alarm triggers a fault status signal when the flow temperature in one or both heating circuits the common flow the d h w circuit does not reach the s...

Page 82: ...eir signals are used for evaluation 22 4 2 Direct d h w heating via heat exchanger With plant types x 4 this function is required to detect faults on the primary valve and primary actuator faults that may pose a risk to the end user Hence this function has not been introduced to monitor the performance of d h w control but to monitor the temperature The function will be activated when the current ...

Page 83: ...play w Setpoint t2 End of ERROR display x Actual value tA Waiting time set on operating line 143 Forbidden range The flow alarm appears on the display as ERROR and on operating line 50 with error code 123 The flow alarm can be deactivated by entering 22 5 Winter summertime changeover The change from wintertime to summertime and vice versa is made automatically If international regulations change t...

Page 84: ...on operating line 151 23 4 Baud rate The Baud rate can be polled on operating line 153 For systems without automatic dis patch of the Baud rate to the slaves the rate can be set 23 5 Load management 23 5 1 Load management of d h w With load management of d h w other d h w setpoints can be imposed on the control ler via M bus This makes sense when there is too much or too little heat available at t...

Page 85: ...alid during the entire duration of the intervention 23 5 4 Use on the LPB On operating line 154 it is possible to define whether the load control signals received via M bus shall be used only locally or additionally shall be passed on via LPB in the segment or in the entire interconnected system The numbers on the display have the following meaning Input Use 0 Only locally 1 In the same LPB segmen...

Page 86: ...oom unit QAW70 1 90 Room temperature sensor QAA10 No device present The example given in the above table uses address 1 For each of the 2 heating circuits a room unit can be connected to the RVD240 One of the 2 units must be addressable however The combination of 2 nonaddressable units e g QAW50 or QAA10 is not permitted This means The first room unit can be a QAA10 QAW50 QAW50 03 or QAW70 The sec...

Page 87: ... input B9 open circuit no sensor present ooo short circuit at the other inputs Code Input Acquired variable measured value 0 B9 Weather outside temperature 1 B1 Flow temperature heating circuit 1 or heat converter 2 B3 D h w flow temperature 3 A6 Room unit heating circuit 1 4 A6 Room unit heating circuit 2 5 B7 Return temperature 6 B71 Return temperature 7 B72 Return temperature 8 B31 Storage tank...

Page 88: ...gized 7 Relay at terminal Y6 energized 8 Relay at terminal Q2 energized 9 Relay at terminal Y7 Q4 energized 10 Relay at terminal Y8 K6 energized Before making the relay test always close the main valve The relay test is terminated as follows Select another operating line or Press any of the operating mode buttons or Switch to manual operation or Automatically after 8 minutes 25 5 Display of the pu...

Page 89: ... variable 1 Maximum Volumetric flow or output common flow 2 Maximum Common primary return 3 Maximum Temperature differential DRT common flow 4 Maximum Common secondary flow 5 Maximum Volumetric flow or output heating circuits 6 Maximum Primary return heating circuit 1 7 Maximum Secondary return heating circuit 1 8 Maximum Temperature differential DRT heating circuit 1 9 Maximum Secondary flow heat...

Page 90: ...and display 27 05 2004 In general The maximum limitation functions will be activated when the respective de mand for temperature not the actual value exceeds the limit value 25 8 Software version The software version is displayed on operating line 170 It is important for service staff when making fault diagnoses ...

Page 91: ...n the locking function level The following function blocks also belong to the locking function level It includes all operating lines from 171 through 196 This level can only be accessed with a code Also refer to subsection 31 1 6 Setting levels and access rights In addition locking on the hardware side is possible operating line 196 26 2 Maximum limitation of the primary return temperature 26 2 1 ...

Page 92: ...R TA s 90 80 70 60 50 40 30 20 20 10 0 10 30 TL constant min TL start 2383D01 TL constant max s Slope operating line 173 TA Actual outside temperature TL constant Upper constant value operating line 172 TL constant Lower constant value operating line 175 TL start Start of compensation operating line 174 TPR Primary return temperature Limitation operates according to the selected characteristic Whe...

Page 93: ...s a reduction to the current limit value of the maximum limitation of the primary return temperature This function can become active only when the respective maximum limitation of the primary return temperature heating circuits or d h w is switched on Maximum limita tion of the primary return temperature can be deactivated on operating line 171 for the heating circuit return separately for each he...

Page 94: ...back to the network In addition maximum limitation of the temperature differential acts as a dynamic limitation of the return temperature shaves peak loads Impact of maximum limitation of the return temperature differential 100 90 80 70 60 50 40 30 20 10 0 VP DRTon DRTOFF VS t 2522D11 DRTON With active maximum limitation of the temperature differential DRTOFF Without maximum limitation of the temp...

Page 95: ...gy and or volumet ric flow pulses from heat meters entry on operating line 55 must be 1 in addition the way the limit function shall act on the heating circuits must be configured on operating line 56 These pulses activate a limit function in the controller The kind of limitation can be selected on operating line 181 Setting Type of pulse Function 1 Energy or volumetric flow pulses Maximum limitat...

Page 96: ...f operation The stroke corresponding to the minimum volumetric flow is acquired by an auxiliary switch fitted in the actuator and is then delivered to the controller The auxiliary switch is connected to terminals B7 M When the valve reaches the minimum limit value the auxiliary switch will close When B7 M closes the valve will be shut and the closing time starts If the link is maintained although ...

Page 97: ...E1P2384en HVAC Products 27 Function block Various functions 27 05 2004 TRw TAM 20 15 10 10 5 0 10 2383D02 5 ER Ts ER Effect or slope operating line 190 TAM Composite outside temperature TRw Reduced room temperature setpoint Ts Start of compensation operating line 189 ...

Page 98: ...settings locked This applies to the following operating lines 4 d h w setpoint 17 23 d h w program 101 release of d h w heating 1 125 assignment of d h w 2 Heating engineer level locked 3 D h w settings and heating engineer level locked 4 All settings locked 28 3 Locking of setting level Locking functions on the hardware side In addition to locking all settings on the software side this function i...

Page 99: ...m unit One exception is the holiday function refer to subsection 29 3 6 Entry of holiday periods The room unit acts fully on the controller also when on the controller an operation locking function is activated operating lines 195 and or 196 Setting 0 A short circuit at the PPS leads to an error message an open circuit represents a permitted status no device present 29 2 Combination with room unit...

Page 100: ...oom unit 29 2 4 Controller with operation lock The room unit acts fully on the controller also when an operation locking function on the controller has been activated operating lines 195 and or 196 Setting 0 29 3 Combination with room unit QAW70 29 3 1 General Room unit QAW70 with room temperature sensor time switch setpoint adjustment knob for room temperature set point readjustments and economy ...

Page 101: ...ture setpoint on the RVD240 will not be affected by the QAW70 29 3 4 Impact of the individual QAW70 operating lines on the RVD240 Op lines QAW70 Function parameter Impact on the RVD240 notes 1 Nominal room tempera ture setpoint Overrides the setting on the controller 2 Reduced room tempera ture setpoint Overrides the setting on the controller 3 D h w temperature set point Overrides the normal setp...

Page 102: ...witched to the holiday mode To be entered is the duration of the holiday period in days The LCD of the room unit displays the entry as follows The weekday on which the holiday period ends appears on the left 1 Monday 2 Tuesday etc The number of days of the holiday period appears on the right The holiday mode starts the moment the entry is made In the holiday mode the controller responds as follows...

Page 103: ...ully closed at 5 times the normal running time and then deenergized This means that the controller can no longer drive them that is only manually if the controller features manual adjustment The heating circuit d h w and intermediate circuit pump as well as the circulating pump if present will be activated The PWM output for speed controlled pumps delivers the signal for 100 The pump speeds on the...

Page 104: ...ion 8 Button for switching between the heating circuits 9 Knob for room temperature setpoint heating circuit 2 in continuous operation ECO 1 2 5 6 7 8 1 3 7 4 6 2384Z03 1 2 3 4 5 7 6 Display 1 Display of positioning signals to the regulating units Y Example Pointer below number 7 lit actuator Y7 receives OPEN pulses 2 Display of the functions of pumps Q Example Bar below number 3 lit pump Q3 runs ...

Page 105: ...me button again or by pressing any of the operating mode buttons 31 1 3 Digital operating elements The entry and readjustment of all setting parameters the activation of optional func tions and the reading of actual values and statuses are based on the operating line principle An operating line with an associated number is assigned to each parameter each actual value and each optional function The...

Page 106: ...pt includes 3 choices aimed at protecting the unit against tampering The functions or settings of function block Locking functions are locked on the software side Locking can be overridden for details refer to the subsection below With the locking on the hardware side overriding of locking on the software side can be prevented also refer to section 28 3 The fixing screws on the controller front ar...

Page 107: ...d display block contains three operating lines that are especially suited for making functional checks On operating line 161 all actual sensor values can be called up The relevant setpoints can be displayed on operating line 162 On operating line 163 all output relays can be individually energized If the display shows Er the fault can be pinpointed via the error code on operating line 50 31 3 Inst...

Page 108: ...en such that there is sufficient space to open the control panel door Cable tension relief must be ensured The cables of the measuring circuits carry extra low voltage The cables from the controller to the regulating unit and the pump carry mains volt age Sensor cables should not be run parallel to mains carrying cable The cores of the 2 wire cable to the PPS room unit are interchangeable ...

Page 109: ...ity H5 Digital input heat meter pulses alarms flow switch heat demand etc M Ground for sensors analog MB LPB ground MD Ground for PPS digital P1 PWM output for speed controlled pumps L Live conductor AC 230 V N Neutral conductor AC 230 V F1 Input for Y1 and Y2 Y1 Control output for valve on the primary side OPEN Y2 Control output for valve on the primary side CLOSED F3 Input for Q1 and Q3 Q1 Contr...

Page 110: ...AC 230 V must be in compli ance with the requirements for safety extra low voltage 32 4 Lightning protection in M bus plants Lightning can adversely affect the proper functioning of M bus plants For this reason the following rules must be observed If bus cables are laid outside buildings the devices are exposed to transients of lightning strokes and must be appropriately protected Every bus cable ...

Page 111: ... the type of plant B31 Storage tank sensor B32 Storage tank or return sensor depending on the type of plant B7 Primary return sensor suppression of hydraulic creep B71 Primary or secondary return sensor depending on the type of plant B72 Primary or secondary return sensor suppression of hydraulic creep B9 Outside sensor H5 Heat meter flow switch alarm contact etc K6 Circulating pump depending on t...

Page 112: ...unting Rail mounting Flush panel mounting the front panel may have a maximum thickness of 3 mm Whichever mounting method is chosen the base must always be mounted and wired first To ensure the orientation will be correct the upper side of both the base and the controller housing carry the marking TOP Both the top and the bottom side of the base have 5 knockout holes for cable entry there are 10 kn...

Page 113: ...uts Switching outputs Rated switching voltage AC 24 230 V Rated current Outputs Y1 Y2 Q1 Q2 Q3 Y7 Q4 Y8 K6 AC 0 02 1 1 A Outputs Y5 Y6 AC 0 02 2 2 A Switch on current max 10 A max 1 s Max rating as mixing valve relay Y1 Y2 Y5 Y6 Y7 Y8 15 VA PMW output Idle voltage 12 V Max internal resistance 1 340 Ω Frequency 2 400 Hz Interfaces PPS Connection to the room unit 2 wire connection interchangeable LP...

Page 114: ...dity 85 r h noncondensing Standards CE conformity to EMC directive 89 336 EEC Immunity EN 50082 2 Emissions EN 50081 1 Low voltage directive 73 23 EEC Product safety Automatic electrical controls for household and similar use EN 60730 1 Particular requirements for temperature sensing controls EN 60730 2 9 Special requirements for energy controllers EN 60730 2 11 Weight Net weight 0 84 kg For setti...

Page 115: ... connection terminals 109 112 contact H5 36 continuous operation 22 control of the circulating pump 59 control of the intermediate circuit pump 39 control of variable speed pump 36 control outputs in manual operation 103 control process d h w circuit 72 control process heat converter 54 control process heating circuit 56 controller in unoperated state 106 controller insert 112 controller internal ...

Page 116: ... display 87 function block Valve actuator d h w 72 function block Valve actuator heating circuit 56 function block Valve actuator of heat converter 54 function blocks list 18 functional checks 107 G gain factor influence of room temperature 41 generation of setpoint 43 H handling 104 heat converter control 54 heat demand signals H5 55 heat demand signals U1 55 heating circuit control 45 heating ci...

Page 117: ...h w heating 61 nominal d h w temperature setpoint 31 nominal setpoint 28 nonoccupancy time 50 O occupancy time 50 operating elements 104 112 operating instructions 105 operating line principle 105 operating lines 107 operating lines QAW70 101 operating mode buttons 105 operating modes 22 operation locking functions 98 optimization 48 optimum shutdown 50 optimum start control 50 optimum stop contro...

Page 118: ...sors direct d h w heating 66 slope of the heating curve 42 software version 90 source of time of day 76 space heating 40 storage tank with electric immersion heater 64 storage tanks 63 stored heat 46 strain relief 108 stratification storage tank 64 suitable actuators 14 suitable room units 14 suitable sensors 13 summer ECO function 46 summertime 83 suppression of hydraulic creep 96 switching diffe...

Page 119: ...76 Closing time actuator of d h w circuit 112 72 Cooling down protection primary flow 192 95 Current room temperature setpoint 1 28 D D h w priority 106 58 D h w temperature 26 32 Date 15 30 Date of first day of holiday 32 33 Date of last day of holiday 33 33 Derivative action time of d h w control 115 72 Device number for bus address 131 76 Display of active limitations 169 87 Display of digital ...

Page 120: ... of flow switch 124 72 Locking setting level Locking functions on the hardware side operating lines 171 196 196 98 Locking settings on the software side 195 98 Locking time after the minimum limitation for the suppression of hydraulic creep 188 95 Lower constant value maximum limitation of the primary return temperature 175 91 M Max setpoint of the return temperature during d h w heating on legion...

Page 121: ...6 80 Pump overrun time heating circuit pump 72 40 Q Quick setback 78 40 R Reduced d h w setpoint for storage tank sensor at the bottom 119 72 Reduced room temperature setpoint 2 28 Relay test 163 87 Release of circulating pump 102 58 Release of d h w heating 101 58 Response to uncritical locking signals from the data bus 137 76 Room temperature terminal A6 24 32 Running time actuator heat converte...

Page 122: ... period 1 7 28 Start of heating period 2 9 28 Start of heating period 3 11 28 Start of release period 1 18 31 Start of release period 2 20 31 Start of release period 3 22 31 Summer wintertime changeover 145 80 Switching differential of the d h w temperature 103 58 T Time of day 13 30 Time of legionella function 126 69 U Upper constant value maximum limitation of the primary return temperature 172 ...

Page 123: ...signals added Pump kick will not be repeated 13 1 Operating line 89 added 13 6 Paragraph operating line 88 corrected 13 7 Section reworded 15 Item D h w setpoints amended 15 1 Setting range operating line 105 corrected 15 2 In table item 2 cross reference to chapter 19 and 2 sentences after the table added 15 5 New section 16 3 3 Cooling down protection Valve closes after 4 minutes 17 Entire chapt...

Page 124: ...124 126 Siemens Building Technologies Basic documentation RVD240 CE1P2384en HVAC Products 27 05 2004 ...

Page 125: ...125 126 Siemens Building Technologies Basic documentation RVD240 CE1P2384en HVAC Products 27 05 2004 ...

Page 126: ...umentation RVD240 CE1P2384en HVAC Products 27 05 2004 Siemens Building Technologies AG HVAC Products Gubelstrasse 22 CH 6301 Zug Tel 41 41 724 24 24 Fax 41 41 724 35 22 www landisstaefa com 2000 Siemens Building Technologies AG Subject to alteration ...

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