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Siemens

Heating and D.h.w. Controller RVL481

CE1P2541en

Building Technologies

19 Function block "D.h.w. storage tank"

20.05.2008

19.4 Boost of the d.h.w. charging temperature

The boost of the d.h.w. charging temperature in °C can be set on operating line 127.
The boost refers to the setpoint of the d.h.w. temperature.
The lower the setting of this value, the longer d.h.w. charging takes.

T

Lw

= T

BWw

+ T

BW

∆

[°C]

Setpoint of d.h.w. temperature (T

BWw

, operating line 26)

= 50 °C

Boost of the d.h.w. charging temperature (T

BW

∆

, operating line 127) = 10 °C

Resulting setpoint of the charging temperature T

Lw

= 60 °C

If thermostats are used, the boost of the d.h.w. charging temperature must still be set.

19.5 Maximum d.h.w. charging time

The maximum charging time for d.h.w. storage tanks can be set on operating line 129.
This function is always active, independent of the kind of d.h.w. priority (absolute, shift-
ing, or parallel).
As soon as d.h.w. charging starts, a counter records the charging time. If charging is
terminated before the set maximum charging time has expired, the counter will be set
to zero. A new charging cycle can commence at any time.
However, if charging takes longer than the set maximum time, charging will be stopped
and than locked for the same period of time. Then, charging will be resumed either until
the setpoint is reached or maximum limitation terminates the charging time again.
This function can be deactivated, in which case the charging time will not be limited.

B

WL

t

2541

D

0

3

ON

OFF

t

T

BWw

T

BW

T

BWw

- SD

BW

t

Lmax

t

Lmax

D.h.w. charging locked

B

WL

D.h.w. charging

ON

D.h.w. charging ON

OFF

D.h.w charging OFF

t Time

t

Lmax

Maximum charging time

T

BW

D.h.w.

temperature

TBWw D.h.w temperature setpoint

SDBW Switching

differential

d.h.w.

19.6 Setpoint of legionella function

On operating line 130, the setpoint of the legionella function can be adjusted or the
function deactivated. This function raises the d.h.w. temperature periodically, thus mak-
ing certain that legionella bacteria will be killed. For description, refer to chapter
"23 Function block "Legionella function"

Example

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70
71
72
73
74
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Summary of Contents for RVL481

Page 1: ...Edition 1 0 Controller series A CE1P2541en 20 05 2008 Building Technologies Heating and D h w Controller RVL481 Basic Documentation ...

Page 2: ...541en Building Technologies 20 05 2008 Siemens Switzerland Ltd Building Technologies Group International Headquarters Gubelstrasse 22 CH 6301 Zug Tel 41 41 724 24 24 Fax 41 41 724 35 22 www sbt siemens com 2008 Siemens Switzerland Ltd Subject to alteration ...

Page 3: ...cal features 15 3 1 1 Plant types with regard to heating circuit 15 3 1 2 Plant types with regard to d h w heating 15 3 1 3 Function blocks 15 3 2 Plant types 16 3 2 1 Selectable combinations 16 3 2 2 Heating circuit plant types 17 3 2 3 D h w plant types 19 3 3 Setting levels function blocks and plant types 21 3 4 Heating circuit operating modes 22 3 4 1 Automatic operation 22 3 4 2 Continuously ...

Page 4: ...re B3 27 4 6 1 Measurement 27 4 6 2 Handling faults 27 4 7 D h w storage tank temperature B31 B32 27 4 7 1 Measurement 27 4 7 2 Handling faults 28 4 8 Collector temperature B6 28 4 8 1 Measurement 28 4 8 2 Handling faults 28 5 Function block Enduser space heating 29 5 1 Operating lines 29 5 2 Setpoints 29 5 2 1 General 29 5 2 2 Frost protection for the building 29 5 3 Heating program 29 5 4 Holida...

Page 5: ...ature source 38 10 4 Optimization 38 10 4 1 Definition and purpose 38 10 4 2 Fundamentals 38 10 4 3 Process 39 10 4 4 Room model temperature 39 10 4 5 Optimum stop control 40 10 4 6 Quick setback 40 10 4 7 Optimum start control 41 10 4 8 Boost heating 41 10 5 Room functions 42 10 5 1 Maximum limitation of the room temperature 42 10 5 2 Room influence 43 10 6 Heating curve 43 10 6 1 Purpose 43 10 6...

Page 6: ...emperatures 55 12 5 Operating mode of pump M1 55 13 Function block Setpoint of return temperature limitation 56 13 1 Operating line 56 13 2 Description 56 13 3 Minimum limitation of the return temperature 56 13 3 1 Acquisition of measured values 56 13 3 2 Mode of operation 56 13 3 3 Mode of operation with a single device with no bus 57 13 3 4 Mode of operation in interconnected plants 57 14 Functi...

Page 7: ...tion block D h w priority and flow temperature setpoint 67 18 1 Operating line 67 18 2 Settings 67 18 3 D h w priority 67 18 3 1 Absolute priority 67 18 3 2 Shifting priority 68 18 3 3 No priority 68 18 4 Flow temperature setpoint 68 18 4 1 Flow setpoint according to maximum selection 68 18 4 2 Flow setpoint according to d h w 68 19 Function block D h w storage tank 70 19 1 Operating lines 70 19 2...

Page 8: ...ergized during occupancy time including optimizations 78 22 2 7 Relay energized if there is demand for heat 78 22 2 8 Manually ON OFF 78 23 Function block Legionella function 79 23 1 Operating lines 79 23 1 1 Periodicity of legionella function 79 23 1 2 Time of legionella function 79 23 1 3 Dwelling time at the legionella setpoint 79 23 1 4 Circulating pump operation during the legionella function...

Page 9: ...ck D h w solar charging 92 26 1 Operating lines 92 26 2 Functions 92 26 2 1 Temperature differential ON OFF solar 92 26 2 2 Minimum charging temperature 93 26 2 3 Minimum runtime 94 26 2 4 Collector frost protection temperature 94 26 2 5 Collector temperature to protect against overheating 95 26 2 6 Storage tank recooling 95 26 2 7 Evaporation temperature of heat carrier 96 26 2 8 Maximum limitati...

Page 10: ...Digital operating elements 105 29 1 4 Setting levels and access rights 106 29 2 Commissioning 107 29 2 1 Installation instructions 107 29 2 2 Operating lines 107 29 3 Installation 107 29 3 1 Mounting location 107 29 3 2 Mounting choices 107 29 3 3 Electrical installation 108 30 Engineering 109 30 1 Connection terminals 109 30 1 1 Low voltage side 109 30 1 2 Mains voltage side 109 30 2 Connection d...

Page 11: ... output DC 0 10 V is used to pass the heat demand signal to other systems A multifunctional relay provides additional control functions if required For direct adjustment of the heating curve the well known bar is used Digital ad justment of the heating curve is possible also A setting knob is used for making room temperature readjustments All the other parameters are set digitally based on the ope...

Page 12: ...ZW30 software version 3 0 or higher The heating controller RVL481 cannot be used as partner unit for the RVL469 1 2 5 Passing on of heat demand signal The scalable DC 0 10 V signal can be used to pass the heat demand signal to other devices in the system 1 2 6 Product documentation Document Doc number Stock number Data Sheet RVL481 N2541 Operating Instructions all RVL types B2540 74 319 0616 0 Ins...

Page 13: ...h all standard heating systems such as Radiators Convectors Underfloor heating systems Ceiling heating systems Radiant panels 2 4 Functions The RVL481 is used if one or several of the following functions is are required Weather compensated flow temperature control Flow temperature control via a modulating seat or slipper valve or boiler temperature control through direct control of a single or 2 s...

Page 14: ...rnal switches Service functions Frost protection for the plant the boiler and the house or building Minimum or maximum limitation of the return temperature DRT limitation Minimum and maximum limitation of the flow temperature Maximum limitation of the room temperature Periodic pump run Pump overrun Maximum limitation of the rate of setpoint increase Flow alarm Legionella function Manual d h w char...

Page 15: ...heat generation systems 3 1 2 Plant types with regard to d h w heating In terms of d h w the following plant types are available D h w plant type 0 No d h w heating D h w plant type 1 D h w heating with charging pump D h w plant type 2 D h w heating with mixing group D h w plant type 3 D h w heating with changeover valve D h w plant type 4 D h w heating with heat exchanger D h w plant type 5 D h w...

Page 16: ...s available 3 2 1 Selectable combinations Combinations Type of heating circuit Type of d h w heating 1 0 No d h w 1 1 Storage tank with charging pump 1 2 Storage tank with mixing group 1 4 Heat exchanger 1 5 Heating circuit control with mixing group With electric immersion heater 2 0 No d h w 2 1 Storage tank with charging pump 2 2 Storage tank with mixing group 2 3 Storage tank with changeover va...

Page 17: ...ontrol acting on the mixing valve of the heating zone Outside temperature signal from own sensor or data bus With or without room influ ence Heating up and setback according to the heating program Can be combined with d h w types with types 1 2 and 4 via hydraulic connection at and with type 5 without hydraulic connection A6 B5 B7 2524S01 1 2 4 Heating circuit control with boiler Space heating wit...

Page 18: ...71 2521S03 A6 B5 Y1 N1 2 4 1 3 Precontrol with mixing group Precontrol with demand dependent control of the main flow temperature 3 position control acting on the mixing valve in the main flow Heat demand signal from data bus No heating program Can be combined with d h w types with types 1 and 2 via hydraulic connection at and with type 5 without hydraulic connection 2524S04 B7 1 2 Precontrol with...

Page 19: ...r K6 Electric immersion heater B31 Storage tank sensor thermostat 1 M1 Heating circuit pump circulating pump B32 Storage tank sensor thermostat 2 M3 Charging pump B5 Room sensor M4 Circulating pump B6 Collector sensor M5 Collector pump B7 Return sensor primary circuit N1 Controller RVL481 B71 Return sensor secondary circuit Y1 Heating circuit mixing valve 2 port valve B9 Outside sensor Y3 Changeov...

Page 20: ...ature with one or 2 sensors or thermostats Circulating pump and solar collector or electric immersion heater are optional Y3 B31 B32 M4 K6 2541S09 B6 M5 N1 D h w heating with heat exchanger D h w heating via heat exchanger instantaneous d h w heating through control of the 2 port valve in the heat exchanger s primary return Acquisition of the d h w tempera ture in the heat exchanger s secondary fl...

Page 21: ...onella function Enduser space heating Enduser d h w Enduser general Plant type Enduser Space heating 3 position actuator heating circuit Boiler Setpoint limitation of return temperature District heating Max limitation of d h w return temperature Basic settings d h w Release of d h w charging D h w storage tank 3 position d h w actuator D h w priority and flow temperature setpoint Multifunctional r...

Page 22: ...nction No holiday mode Remote operation from a room unit not possible Frost protection is ensured 3 4 3 Continuously NORMAL heating Continuous heating to NORMAL temperature No ECO function No holiday mode Remote operation via room unit not possible Frost protection is ensured 3 4 4 Protection mode Heating is switched off but is ready to operate Frost protection is ensured 3 5 D h w operating mode ...

Page 23: ...Heating circuit position D h w slipper seat valve This valve is driven to the fully closed position in which case the closing time is five times the set running time Then it is deactivated Circulating pump M4 Continuously running Electric immersion heater K6 Continuously released Multifunctional relay Continuously energized Manual operation also negates any overriding of the controller s operating...

Page 24: ...2 operating states with the exception of operating mode Continuously NORMAL heating only one operating state possi ble When the ECO function is active and in the case of quick setback the operating state is always OFF When the operating state is ON there is a maximum of 3 operational levels depending on the operating mode The operational level is determined by the heating program and the holiday p...

Page 25: ...ssage will be generated Room temperature sensor QAA24 operating line 65 2 In the event of a short circuit or open circuit the control continues to operate with the room model depending on the function An error message will be generated Average value operating line 65 3 In the event of a short circuit or open circuit in one of the 2 measuring circuits the con trol continues to operate with the norm...

Page 26: ...f there is a short circuit or open circuit in the measuring circuit the controller responds as follows depending on the outside temperature source Controller not connected to the data bus LPB The control operates with a fixed value of 0 C outside temperature An error message will be generated Controller connected to the data bus LPB If the outside temperature is available via data bus it will be u...

Page 27: ...ng a sensing element LG Ni 1000 This measured value is required for DRT limitation plant types 3 x and 6 x together with the primary return temperature 4 5 2 Handling faults If there is a short circuit or open circuit in the measuring circuit and if the controller requires the return temperature DRT limitation will be deactivated An error message will be generated 4 6 D h w flow temperature B3 4 6...

Page 28: ... deactivated Exception With plant type x 2 the d h w storage tank is always charged when sensor B3 d h w flow works normally One d h w storage tank thermostat operating line 126 2 If in measuring circuit B31 there is neither an open circuit thermostat open nor a short circuit thermostat closed an error message will be generated The d h w will no longer be heated and the charging pump is deactivate...

Page 29: ...e are entered directly in C room temperature They are independent of whether or not the control uses a room temperature sensor 5 2 2 Frost protection for the building The lowest valid room temperature setpoint always corresponds to at least the setpoint of holiday mode frost protection setting on operating line 3 even if lower values have been entered as the setpoints of the NORMAL and the REDUCED...

Page 30: ...liday mode takes place At 24 00 of the last day of the holiday period the RVL481 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 observe a certain order Depending on the entry made on operating line 121 the holiday ...

Page 31: ...he setpoint of the thermostat or if 2 thermostats are used of both thermostats If there is a deviation the charging temperature cannot be correctly calcu lated charging temperature NORMAL setpoint operating line 26 boost of charging temperature operating line 127 If d h w heating is switched to the electric immersion heater the setpoint adjustment is inactive in that case since the thermostat of t...

Page 32: ...irculating pump As a time switch program for the release of d h w heating As a time switch program for the multi functional relay Switching program 2 of the RVL481 affords a maximum of three ON periods per day Also every day of week may have different ON periods As with the heating program it is not the switching times that are to be entered but the periods of time during which the program or the ...

Page 33: ...t room temperature sensor 61 Fault room unit 62 Wrong room unit connected 73 Fault collector sensor 81 Short circuit on the bus LPB 82 Same bus address assigned several times LPB 100 Two clock masters on the bus LPB 120 Flow alarm 140 Inadmissible bus address or plant type LPB If a fault occurs the LCD displays In interconnected plants the address device and segment number of the controller causin...

Page 34: ...0 6 5 8 2 General When commissioning the plant the respective plant type must be entered first This ensures that the functions required for the specific type of plant the parameters and operating lines for the settings and displays will be activated All plant specific variables and operating lines existing for the other plant types will then be hidden They will not be displayed Example for an entr...

Page 35: ...gral is a variable generated from the progression of the cascade flow temperature and time t If the variable falls below the setpoint the difference will be communicated to the cascade master as the heat deficit KFI T dt t 0 where T TVKw 0 5 SD TVKx 0 TVKw Flow temperature setpoint of the cascade TVKx Actual value of cascade flow temperature SD Switching differential of the boiler t Time 9 2 2 Boi...

Page 36: ...en using the ECO function the heating system operates only or consumes energy only when required 10 2 1 Compensating variables and auxiliary variables As compensating and auxiliary variables the ECO function takes into account the de velopment of the outside temperature and the heat storage capacity of the building The following variables are taken into consideration The building time constant thi...

Page 37: ...s can be set ECO day for NORMAL heating ECO night for the lower temperature level This can be REDUCED heating or OFF holidays frost protection In both cases the heating limit is the outside temperature at which the heating shall be switched on and off The switching differential is 1 C 10 2 3 Mode of operation The heating will be switched off when one of the 3 following conditions is satisfied The ...

Page 38: ... at terminal A6 2 Room sensor connected to terminal B5 3 Average of devices connected to A6 and B5 A Automatic selection Operating line 65 also displays the room temperature source actually used by the con troller ACTUAL ACTUAL 0 controller operates without a sensor ACTUAL 1 controller operates with a room unit connected to terminal A6 ACTUAL 2 controller operates with a room sensor connected to t...

Page 39: ...arning process always concentrates on the first heating period per day When no room temperature sensor is used the room model only allows optimum start control Optimization operates with fixed values no learning process based on the set maxi mum heating up time and the room model 10 4 3 Process HP TRw TRx TRw TRw TRw 2540D01 0 5 C TR t HP Heating program TR Room temperature t Time t1 Forward shift...

Page 40: ...e such that at the end of occu pancy the room temperature will lie 0 5 C below the setpoint of NORMAL heating optimum shutdown By entering 0 hours as the maximum optimum shutdown optimum stop control can be deactivated 10 4 6 Quick setback When changing from the NORMAL temperature to a lower temperature level REDUCED or holidays frost the heating will be shut down And it will remain shut down unti...

Page 41: ...eviously quick setback took place Optimum start control can be deactivated by entering 0 hours as the maximum heating up period 10 4 8 Boost heating For boost heating a room temperature setpoint boost can be set After changeover to the NORMAL temperature the higher room temperature setpoint applies resulting in an appropriately higher flow temperature setpoint D h w heating during boost heating do...

Page 42: ...m functions 10 5 1 Maximum limitation of the room temperature For the room temperature it is possible to have an adjustable maximum limitation For that purpose a room sensor is required sensor or room unit If the room temperature lies 1 C above the limit value the room temperature setpoint will be lowered by 4 C Maximum limitation of the room temperature is independent of the setting used for the ...

Page 43: ...resulting from the change of the room temperature setpoint is calculated as follows TVw TRw 1 s K s Heating curve slope TRw Room temperature setpoint TRw Change of room temperature setpoint TRw Decrease of room temperature setpoint TRw Increase of room temperature setpoint TRx Actual value of the room temperature TR Room temperature deviation TRw TRx TVw Change of flow temperature setpoint VF Gain...

Page 44: ...onally when the difference between radiator and room temperature increases For this reason the radiators heat exchanger characteristic is deflected The heating curve s deflection takes these characteristics into consideration In the range of small slopes e g with underfloor heating systems the heating curve is practically linear due to the small flow temperature range and therefore corresponds to ...

Page 45: ...00 0 10 10 0 30 TRw TA TV 20 40 Parallel displace ment of heating curve s Slope TA Outside temperature TV Flow temperature TRw Room temperature setpoint 10 6 5 Display of setpoints 2 current setpoints result from the basic setting the position of the setting knob and if made the entry on operating line 72 which can be called up on operating line 166 Resultant flow temperature setpoint at an outsid...

Page 46: ... Operating line 1 2 oder 3 Composite outside temperature Heating curve Setting knob on controller Parallel displacement of heating curve operating line 72 Setpoint on operating line 165 Flow temperature setpoint TVw LPB Data bus OZW30 SYNERGYR central unit s Slope Active only with room unit level The impact of the central unit OZW30 is described in section 28 2 Combination with SYNERGYR central un...

Page 47: ...C 83 Maximum rate of flow temperature increase 1 600 C h 84 Flow temperature boost mixing valve heat exchanger 10 0 50 C 85 Actuator running time 120 30 873 s 86 P band of control Xp 32 0 1 100 C 87 Integral action time of control Tn 120 30 873 s 11 2 Limitations 11 2 1 Flow temperature limitations The following settings can be made Maximum limitation of the flow temperature At the limit value the...

Page 48: ...nsitive to quick temperature increases e g antiquities prevents excessive loads on heat generating equipment This function can be deactivated setting During d h w heating limitation of the rate of increase acts as follows Plant type Effect 1 x 3 0 3 2 3 4 3 5 4 x 6 x Limitation of the rate of increase is always active 3 1 3 3 Limitation of the rate of increase only acts with shifting or parallel d...

Page 49: ...es the mixing valve controller N2 in the example below operating line 84 N2 wN2 wN1 wN2 w 2540S07 wN2 w w BUS LPB N1 Boiler temperature controller heat generation N2 Flow temperature controller heating zone wN1 Setpoint of boiler temperature controller wN2 Setpoint of flow temperature controller w Excess mixing valve temperature set on controller N2 11 5 Pulse lock If during a period of time that ...

Page 50: ...th manual shutdown The boiler will be shut down when there is no demand for heat and protection mode is selected setting 0 on operating line 91 With automatic shutdown The boiler will be shut down when there is no demand for heat irrespective of the selected operating mode setting 1 on operating line 91 Boiler operating modes when there is no demand for heat Boiler operating mode Controller s oper...

Page 51: ...switching differential and the minimum burner running time The controller compares the actual value of the boiler temperature with the setpoint If the boiler temperature falls below the setpoint by half the switching differential the burner will be switched on If the boiler temperature exceeds the setpoint by half the switching differential the burner will be switched off 2540D09 TK ON OFF TKw 0 5...

Page 52: ...by how much the flow temperature remains be low w 0 5 SD It continually generates the integral based on the time and the pro gression of temperature If on completion of the minimum locking time the flow temperature is below w 0 5 SD and if the release limit reaches the set maximum limit the second burner stage will be released and switched on The flow temperature starts rising When the flow temper...

Page 53: ...r temperature setpoint TKx Actual value of boiler temperature YB1 Control signal for burner stage 1 YB2 Control signal for burner stage 2 12 4 3 Frost protection for the boiler Frost protection for the boiler operates with fixed values Switch on point 5 C boiler temperature Switch off point Minimum limit of the boiler temperature plus switching differential If the boiler temperature falls below 5 ...

Page 54: ...se the critical locking signal is zero Protective boiler startup can be interrupted to ensure that in the event of a burner fault for instance frost protection for the plant will be provided In the case of protective boiler startup and simultaneous frost protection for the plant the boiler temperature gradient must turn positive within 15 minutes Otherwise the locking signal will become invalid fo...

Page 55: ...the consumers and heat converters only allow pump overrun to take place refer to section 25 4 4 Pump overrun If in this time window a forced signal is received the loads continue to draw heat from the boiler in the following manner Plant types with heating circuits using a mixing valve maintain the previous set point Plant types with pump heating circuits allow the pumps to continue running D h w ...

Page 56: ...ant type 1 x Heating circuit control with mixing group Plant type 4 x Precontrol with mixing group Plant type 5 x Precontrol with boiler Minimum limitation of the return temperature prevents boiler corrosion due to flue gas condensation 13 3 1 Acquisition of measured values A temperature sensor with a sensing element LG Ni 1000 is required in the return With plant type 1 x the return temperature c...

Page 57: ...e101 50 C return sensor connected Setting operating line 101 no own return sensor connected Setting operating line 101 no own return sensor connected Critical locking signal Controller 1 Boiler controller Controller 2 Plant type 1 0 Controller 3 Plant type 1 0 Return temperature signal Controller 2 limits the return temperature to 50 C min LPB 254102en Setting operating line 101 50 C return sensor...

Page 58: ...rature 30 0 60 min 115 Maximum limitation of return temperature differential 0 5 50 C 116 Minimum stroke limitation Ymin function 6 1 20 min 14 2 Limitations 14 2 1 Maximum limitation of the primary return temperature The primary return temperature uses maximum limitation to make certain that too hot water will not be fed back to the district heating network minimize piping losses of the district ...

Page 59: ...ation of the return temperature has priority over minimum limitation of the flow temperature This function can be deactivated on operating line 101 If the return temperature is limited the display shows 14 2 2 Maximum limitation of return temperature differential DRT limitation For the differential of primary return and secondary return temperature a maximum limitation can be set For this purpose ...

Page 60: ...ed to the type of plant 14 2 4 Minimum stroke limitation suppression of hydraulic creep To avoid measurement errors in connection with heat metering due to extremely small flow rates the flow through the two port valve in the primary return can be limited to a minimum Ymin function If the valve is supposed to open below the minimum stroke position it will be fully closed and remains closed until t...

Page 61: ...t value during d h w heating and the limit value during space heating only make certain that too hot water will not be fed back to the district heating network minimize piping losses of the district heating utility satisfy the regulations of the district heating utility 15 3 Function The maximum limit value during d h w heating is set in C on operating line 117 the integral action time for this fu...

Page 62: ...ed for all heating circuits of the controllers connected to the data bus LPB The setting is required in connection with operating lines 122 circulating pump pro gram and 123 release of d h w heating 16 3 Program for the circulating pump 16 3 1 General mode of operation On operating line 122 it is possible to enter according to which time program the d h w circulating program shall operate The use ...

Page 63: ...g mode Heating program holidays Circulating pump A 06 00 18 00 B 07 00 23 00 C 07 00 22 00 2 1 D 03 00 22 00 HOLIDAYS The circulat ing pump runs from 06 00 00 to 23 00 Example 2 Operating line 121 122 Con trollers Operating mode Heating program holidays Circulating pump A 06 00 00 0 18 00 opti mum start control shifts forward by 2 hours B 08 00 23 00 C 07 00 22 00 2 1 D 05 00 21 00 The circulat in...

Page 64: ... a heat requisition to the precontroller The switch off temperature is at 5 C plus the switching differential set on operating line 128 When using thermostats there is no frost protection for the d h w storage tank 16 4 2 Frost protection in the d h w storage tank flow This type of frost protection is used with plant types x 2 If the d h w flow temperature acquired with sensor B3 falls below 5 C t...

Page 65: ...eded With plants using instantaneous d h w heating plant type x 4 The valve in the pri mary return is controlled such that the required d h w temperature at sensor B3 will be reached This function makes it possible to reduce the d h w temperature during nonoccupancy times to the REDUCED setpoint at night or to shut it down e g during holiday peri ods If d h w heating in the summer takes place alte...

Page 66: ...x and 6 x and the setting of 0 own controller on operating line 121 d h w heating will never be released since these plant types have no own heating program The release of d h w heating is explained using 2 examples in which controllers A B C and D are interconnected via the data bus Operating line 121 123 Con trollers Operating mode Heating program optimi zation holidays Release A 06 00 18 00 no ...

Page 67: ...iven priority over space heating For this purpose the controller offers 3 types of d h w priority Absolute priority Shifting priority No priority parallel operation In the case of plants using a changeover valve plant types x 3 absolute priority is always present In that case selection of the kind of priority has no impact The priority is provided by delivering locking signals The effect of the lo...

Page 68: ...livers the locking signal to all controllers in all segments If the heat source is in segment 1 14 it only sends the locking signal to the controllers in the same segment 18 3 3 No priority No priority means parallel operation D h w charging has no impact on the heating circuits 18 4 Flow temperature setpoint With Shifting priority and No priority the temperature setpoint of the common flow which ...

Page 69: ...8 Function block D h w priority and flow temperature setpoint 20 05 2008 It is assumed that the mixing heating circuit calls for 80 C and the d h w circuit for 65 C With d h w charging the setpoint of the common flow temperature will then be that of the d h w circuit namely 65 C Example ...

Page 70: ...th hot water The setting on operating line 125 is 0 The d h w storage tank is charged exclusively with hot water throughout the year 19 2 2 Alternate d h w charging with hot water and electricity The setting on operating line 125 is 1 2 or 3 In the winter the d h w storage tank is charged with hot water from the heating system and in the summer with the electric immersion heater Changeover takes p...

Page 71: ...n temperature TBWx2 Measured value d h w storage tank sensor B32 TOFF Switch off temperature If the d h w storage tank is equipped with thermostats the switch on off temperature is determined by the thermostats Determination of the switch on temperature start of d h w charging Operating line 126 Measurement Switching criterion 0 1 sensor TBWx1 TBWw SDBW 1 2 sensors TBWx1 TBWw SDBW and TBWx2 TBWw S...

Page 72: ...counter records the charging time If charging is terminated before the set maximum charging time has expired the counter will be set to zero A new charging cycle can commence at any time However if charging takes longer than the set maximum time charging will be stopped and than locked for the same period of time Then charging will be resumed either until the setpoint is reached or maximum limitat...

Page 73: ...ed prematurely plant types x 1 and x 2 the changeover valve will be driven to the position Heating circuit plant types x 3 If the storage tank is equipped with two sensors the sensor measuring the higher tem perature is considered The flow temperature is acquired with sensors B1 and B3 depending on the type of plant or obtained from the data bus LPB as the common flow temperature If the flow tempe...

Page 74: ...f d h w heating is switched off due to holiday mode d h w heating is locked because the maximum charging time has been exceeded Manually initiated charging of the d h w storage tank is stopped only if the NORMAL d h w temperature setpoint is reached or if the maximum charging time is exceeded After manual charging d h w heating always remains switched on irrespective of whether or not it was switc...

Page 75: ...ng line 132 is added to the setpoint of d h w flow sensor B3 Plant type x 4 heat exchanger For the temperature demand to the precontroller heat source the value of operating line 132 is added to the setpoint of d h w flow sensor B3 20 2 2 D h w temperature control The control process depends on the type of plant Plant type x 2 The control mode is PI the flow temperature is controlled by the modu l...

Page 76: ...ontrol Tv 16 0 255 s 21 2 Description The 3 position controller provides PID mode The derivative action time Tv D part can be set on operating line 137 A deviation of the flow temperature from the setpoint is offset by incremental adjust ment of the 2 port valve The ideal runtime of the actuator is 10 35 seconds In the case of d h w heating via heat exchanger it is best to set operating lines 133 ...

Page 77: ...he time switch 3 Relay energized in the event of fault 4 Relay energized during occupancy time according to the heating program with no optimization 5 Relay energized during occupancy time according to the heating program including optimizations 6 Relay energized if there is demand for heat 7 Manually ON OFF 22 2 1 No function No function is assigned to the multifunctional relay 22 2 2 Outside tem...

Page 78: ... relay is energized In operating mode no consideration is given to optimum start stop control With the plant types that do not have their own heating circuit 4 x 5 x and 6 x the setting Relay energized during occupancy time makes no sense In that case the multifunctional relay is always de energized 22 2 6 Relay energized during occupancy time including optimizations If the own heating circuit is ...

Page 79: ... Setting 0 ensures that d h w heating to the legionella setpoint takes place once a day Settings 1 through 7 ensure that d h w heating to the legionella setpoint takes place once a week Setting 1 means every week on Monday setting 2 every week on Tuesday etc 23 1 2 Time of legionella function The time of day the legionella function shall be activated can be set on operating line 48 23 1 3 Dwelling...

Page 80: ...s enabled If d h w heating is switched off or the holiday function or operating mode changeover active the le gionella function will be released but not the setpoint boost On termination of the over riding function d h w heating to the legionella setpoint will again be triggered since the legionella function is still released The behavior of the legionella function as a function of the d h w tempe...

Page 81: ...0 00 00 24 00 hh mm 154 Start of second ON period 00 00 24 00 hh mm 155 End of second ON period 00 00 24 00 hh mm 156 Start of third ON period 00 00 24 00 hh mm 157 End of third ON period 00 00 24 00 hh mm 24 2 Function Switching program 3 of the RVL481 affords a maximum of 3 ON periods per day Also every day of week may have different ON periods As with the heating program it is not switching tim...

Page 82: ...for frost protection for the plant 15 0 140 C 169 Device number 0 0 16 170 Segment number 0 0 14 171 Flow alarm 1 00 10 00 hh mm 172 Operating mode when terminals H1 M are bridged 0 0 9 173 Gain of locking signal 100 0 200 174 Pump overrun time 6 0 40 min 175 Pump kick 0 0 1 176 Winter summertime changeover 25 03 01 01 31 12 dd MM 177 Summer wintertime changeover 25 10 01 01 31 12 dd MM 178 Clock ...

Page 83: ...llel displacement setting on operating line 72 The display also shows the 2 flow temperature setpoints TV1 current setpoint at an outside temperature of 15 C TV2 current setpoint at an outside temperature of 5 C With demand compensated control plant types 4 x 5 x and 6 x the display shows TV1 TV2 operating line 166 Parallel displacement of heating curve operating line 72 1 s 2541B05en TV TAM Heati...

Page 84: ... outside temperature will gradually read just the composite and the attenuated temperatures to their correct values The simula tion of the outside temperature causes therefore a reset of the attenuated and the com posite outside temperatures There are 3 choices to terminate the simulation Entry of Leaving the setting level by pressing the Info button or any of the operating mode buttons Automatica...

Page 85: ...or at terminal B5 3 Setpoint of room temperature With the plant types with no rooms the display shows Actual value of room unit sensor at terminal A6 4 Limit value of return temperature With plant types 1 x 4 x and 5 x the minimum limit value of the return tem perature is displayed with plant types 3 x and 6 x the maximum limit value of the return temperature If no return temperature limitation is...

Page 86: ...ction function 2540D08 OpL 167 TA ON OFF 0 5 C 0 5 C OpL167 Operating line 167 TA Outside temperature OFF Frost protection OFF ON Frost protection ON If the outside temperature falls below the limit value setting on operating line 167 mi nus 0 5 C the RVL481 will switch the circulating pump on pump connected to termi nal Q1 and maintain the flow temperature at the selected minimum level The contro...

Page 87: ...uit and that of d h w can be overridden This is accomplished by bridging terminals H1 M It is possible to select the operating mode to be used when H1 M are bridged Setting Operating mode heating circuit Operating mode d h w 0 Protection OFF 1 AUTO OFF 2 REDUCED OFF 3 NORMAL OFF 4 Protection ON 5 AUTO ON 6 REDUCED ON 7 NORMAL ON 8 AUTO ON 24 hours a day 9 NORMAL ON 24 hours a day As long as this f...

Page 88: ... 25 The date to be entered on operating line 176 is then 25 03 If no summer wintertime changeover is required the two dates are to be set such that they coincide 25 4 7 Gain of locking signal The functions Maintained boiler return temperature Protective boiler start up and D h w priority use locking signals that are sent to the heat exchangers and loads With the heat convector and load controllers...

Page 89: ...gnal gain In plants with changeover valve the valve assumes the Heating circuit position 25 5 Entries for LPB 25 5 1 Source of time of day Depending on the master clock different sources for the time of day can be used The source must be entered on the RVL481 on operating line 178 using setting 0 3 0 autonomous clock in the RVL481 1 time of day from the bus clock slave with no remote readjustment ...

Page 90: ...2030 25 5 3 Addressing the devices Each device connected to the data bus LPB requires an address This address is comprised of a device number 1 16 operating line 169 and a segment number 0 14 operating line 170 In an interconnected plant each address may be assigned only once If this is not ob served proper functioning of the entire plant cannot be ensured In that case a fault status signal will b...

Page 91: ...TUAL 0 Presently no bus power supply available ACTUAL 1 Bus power supply presently available The word BUS appears on the display only when the bus address is valid and when bus power supply is available This means the display indicates whether or not data traffic via the data bus is possible 25 5 5 Bus loading number The bus loading figure E for the LPB of the RVL481 is 7 The total of all E number...

Page 92: ...nsor B32 and boiler support via the upper sensor B31 As a result only the upper portion of the storage tank is charged via boiler M4 2541S12 K6 B6 M5 B31 B32 B31 Storage tank sensor 1 B32 Storage tank sensor2 B6 Collector sensor K6 Electric immersion M4 Circulation pump M5 Collector pump 26 1 Operating lines Line Function parameter Factory setting range Unit 201 Temperature differential ON solar 8...

Page 93: ...w the tempera ture differential TKol TSp SDOFF 26 2 2 Minimum charging temperature The collector pump is commissioned only if the collector has a minimum temperature of 30 C and the required temperature differential is reached T ON OFF TLmin 30 C SDON SDOFF t TKol 2541D06 TKol Collector temperature ON OFF Collector pump SDON Temperature differential ON SDOFF Temperature differential OFF TLmin Mini...

Page 94: ...tor pump tMin Minimum runtime 26 2 4 Collector frost protection temperature Operating line 203 is used to set the frost protection temperature for the collector The collector pump is operated if there is a risk of frost at the collector to prevent the heat carrier from freezing T ON OFF t TKol 2541D09 1 K TKolFrost TKol Collector temperature TKolFrost Collector frost protection temperature ON OFF ...

Page 95: ...llector temperature overheating protection temperature and if the storage tank temperature maximum limitation is not yet reached TKol TKolUe and TSp TSpSi The collector pump is switched off if the collector temperature drops by 5 K below the overheating protection temperature TKol TKolUe 5 K The collector pump is switched off if the current storage tank temperature reaches the maximum limitation T...

Page 96: ...he recooling setpoint to 1 K TSp TRk 1 K 26 2 7 Evaporation temperature of heat carrier Operating line 205 allows for setting the evaporation temperature of the heat carrier If there is a risk of evaporation at the heat carrier due to the high collector tempera ture the collector pump is switched off to prevent it from running hot This is a pump protection function T ON OFF TVerd t TKol 2541D11 15...

Page 97: ...e Charging is stopped if the storage tank temperature exceeds the maximum limita tion TSp TSpMax Charging is again released if the storage tank temperature drops below the maximum limitation by 1 K TSp TSpMax 1 K The collector overheating protection function can again activate the collector pump until the storage tank temperature maximum limitation is reached 26 2 9 Storage tank temperature maximu...

Page 98: ...nction The pump is switched on if the collector temperature increases by less than the set gradient The pump remains on if the required temperature increase at the collector is reached within one minute The pump is again switched off if the collector temperature does not reach the required level or continues to drop The gradient corresponds to the time period required to increase the collector s s...

Page 99: ...lay 2 Press buttons and one after the other 3 Now operating line 248 appears in the display The following locking choices are available 0 No locking 1 All settings are locked 2 Only the settings required for the district heat parameters are locked operating lines 101 to 117 After locking all settings the following setting elements remain operative The buttons for selecting the operating lines The ...

Page 100: ... on operating line 196 28 1 2 Combination with room unit QAW50 Room unit QAW50 with room temperature sensor and room temperature readjustment setting knob The QAW50 can act on the RVL481 as follows Overriding the operating mode of the heating circuit Readjustment of room temperature For this purpose the QAW50 has 3 operating elements Operating mode slider Economy button also called presence button...

Page 101: ...this purpose the QAW70 has the following operating elements Operating mode buttons Economy button also called presence button Knob for room temperature readjustments Buttons for selecting the operating lines Buttons for changing the values The day of the week is calculated automatically by the controller an adjustment from the room unit QAW70 is not possible From the QAW70 the heating circuit s op...

Page 102: ...ting period start of NORMAL heating Changes operating line 7 on the RVL481 8 2 Third heating period start of REDUCED heating Changes operating line 8 on the RVL481 9 3 Third heating period start of NORMAL heating Changes operating line 9 on the RVL481 10 3 Third heating period start of REDUCED heating Changes operating line 10 on the RVL481 11 Display of weekdays 1 7 Cannot be adjusted refer to su...

Page 103: ...entral unit software version 3 0 or higher generates a load compensation signal This signal is passed on via the LPB to the RVL481 where it produces an appropriate change of the flow temperature setpoint 28 3 Communication with other devices The RVL481 offers the following communication choices Signaling the heat demand of several RVL481 to the heat source Exchange of locking and forced signals Ex...

Page 104: ...circuit mixing valve closes burner stage 2 ON Pump runs 8 Button for d h w heating ON OFF ON button lit 9 Sealing facility in the cover 10 Info button for the display of actual values 11 Setting slider for flow temperature setpoint at an outside temperature of 5 C 12 Setting slider for flow temperature setpoint at an outside temperature of 15 C 13 Setting knob for readjustment of room temperature ...

Page 105: ...e is displaced parallel functionally but the bar maintains its position 3 buttons are used for manual operation One button for the activation of manual operation An LED indicates manual operation Manual operation is quit by pressing the same button again or by pressing any at the operating mode buttons 2 buttons for manual positioning commands In plants using mixing valves the regulating unit can ...

Page 106: ...ion of the next higher function block Keep depressed and press Selection of the next lower function block The Info button is used to obtain basic information about the plant Pressing this button the cursor in the display is placed below the required symbol The numbers on the display have the following meaning Symbol Display of Flow or boiler temperature Room temperature Outside temperature Time of...

Page 107: ...re especially suited for making functional checks Operating line 161 permits simulation of the outside temperature On operating line 162 each of the output relays can be energized On operating line 163 all actual sensor values can be called up On operating line 164 the states of the H x contacts can be called up If the display shows the fault can be pinpointed via the error code on operating line ...

Page 108: ...electrical installations The cable lengths should be chosen 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 voltage The cables to the sensors must not be run parallel to mains carrying cable e g power sup...

Page 109: ...ating mode B32 Storage tank sensor thermostat 2 B5 Room sensor B71 Return sensor secondary circuit H4 Minimum stroke limitation Ymin contact H3 Contact for locking the district heat parameters B6 Collector sensor In addition to the standard connection terminals there is an auxiliary terminal M available 30 1 2 Mains voltage side N Neutral conductor AC 230 V L Live conductor AC 230 V F1 F4 Input fo...

Page 110: ... 230 V Q1 M1 M4 Q4 M5 Q5 L 2 K6 1 Y1 K4 Y2 K5 F2 F5 N N1 Y3 F3 Y1 Y2 N L N F4 A6 Room unit B1 Flow boiler sensor B3 D h w flow sensor B31 Storage tank sensor thermostat 1 B32 Storage tank sensor thermostat 2 B5 Room sensor B6 Collector sensor B7 Return sensor primary circuit B71 Return sensor secondary circuit B9 Outside sensor E1 2 stage burner F1 Thermal reset limit thermostat F2 Safety limit th...

Page 111: ...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 entries and there are 10 knock out holes in the floor The controller insert is placed in the base The controller ins...

Page 112: ...ontroller clock 12 h conformance to EMC directive Immunity Emissions Low voltage directive Safety 2004 108 EC EN 61000 6 1 2 EN 61000 6 3 4 2006 95 EC EN 60730 1 EN 60730 2 9 Safety class II to EN 60730 Degree of protection cover closed IP42 to EN 60529 Degree of contamination 2 to EN 60730 Refer to Dimensions Unit net 1 2 kg Controller insert Light grey RAL 7035 Terminal base Pigeon blue RAL 5014...

Page 113: ...g circuit s operating mode 104 C CE conformity 111 central unit OZW30 102 changeover valve 72 charging temperature max limitation solar 96 circulating pump 62 collector frost protection 93 collector pump 93 collector start function 97 collector stationary temperature 97 collector temperature 92 Collector temperature 28 combination with room units 99 combinations 16 commissioning 106 commissioning ...

Page 114: ...on block boiler 50 function block derivative action time d h w heating via heat exchanger 75 function block district heat 58 function block enduser d h w 31 function block enduser general 32 function block enduser space heating 29 function block legionella function 78 function block locking functions 98 function block maximum limitation of the return temperature d h w 61 function block multifuncti...

Page 115: ...rating lines 106 operating lines QAW70 101 operating mode continuously NORMAL heating 22 operating mode continuously REDUCED heating 22 operating state 24 operation 103 operational level 24 optimization 38 optimum shutdown 40 optimum start control 41 optimum stop control 40 output relays 110 outside sensor 26 outside temperature 26 outside temperature source 89 outside temperature switch 76 overla...

Page 116: ...AW70 100 setting levels 105 setting ranges 111 shifting priority 67 short circuit 25 simulation of the outside temperature 83 slope of maximum limitation 58 software version 83 source of time of day 88 storage tank recooling solar 94 storage tank temperature 27 storage tank temperature maximum limitation 96 storage temperature maximum limitation 94 stored heat 36 suitable actuators 12 suitable roo...

Page 117: ...117 118 Siemens Building Technologies Heating and D h w Controller RVL481 CE1P2541en HVAC Products Index 20 05 2008 ...

Page 118: ...ler RVL481 CE1P2541en HVAC Products 20 05 2008 Siemens Switzerland Ltd Building Technologies Group International Headquarters Gubelstrasse 22 CH 6301 Zug Tel 41 41 724 24 24 Fax 41 41 724 35 22 www sbt siemens com 2008 Siemens Switzerland Ltd Subject to alteration ...

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