Heating and D.h.w. Controller RVL482 Basic Documentation Edition: 1.0 Controller series: A CE1P2542en 20.05.
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 2/127 Siemens Building Technologies Heating and D.h.w. Controller RVL482 CE1P2542en 20.05.
Contents 1 Summary ...................................................................................................... 13 1.1 Brief description and key features ................................................................. 13 1.2 Equipment combinations ............................................................................... 13 1.2.1 Suitable sensors ............................................................................................ 13 1.2.2 Suitable room units................
.1.3 Room model...................................................................................................27 4.2 Flow temperature (B1) ...................................................................................27 4.2.1 Measurement .................................................................................................27 4.2.2 Handling faults ...............................................................................................28 4.3 Boiler temperature (B2)........
7.1 Operating lines .............................................................................................. 35 7.2 Switching program 2...................................................................................... 35 7.3 Time of day and date..................................................................................... 35 7.4 Indication of errors......................................................................................... 36 8 Function block "Plant type" ............
12.6.1 Purpose..........................................................................................................48 12.6.2 Basic setting...................................................................................................48 12.6.3 Deflection .......................................................................................................49 12.6.4 Parallel displacement of the heating curve ....................................................49 12.6.
16 Function block "Setpoint of return temperature limitation".................... 61 16.1 Operating line ................................................................................................ 61 16.2 Description..................................................................................................... 61 17 Function block "Type of limitation of return temperature" ..................... 62 17.1 Operating line .......................................................................
22.3.3 Frost protection in the secondary d.h.w. flow.................................................71 23 Function block "Release, priority and flow temperature setpoint of d.h.w.".......................................................................................................72 23.1 Operating lines...............................................................................................72 23.2 Release........................................................................................
26.1 Operating line ................................................................................................ 82 26.2 Description..................................................................................................... 82 27 Function block "Multifunctional relay" ........................................................ 83 27.1 Operating lines .............................................................................................. 83 27.2 Functions ..........................
30.4.6 Winter- / summertime changeover.................................................................94 30.4.7 Gain of locking signal.....................................................................................94 30.5 Entries for LPB...............................................................................................95 30.5.1 Source of time of day .....................................................................................95 30.5.2 Outside temperature source ...........
35.1 Combination with room units ....................................................................... 110 35.1.1 General........................................................................................................ 110 35.1.2 Combination with room unit QAW50 ........................................................... 110 35.1.3 Combination with room unit QAW70 ........................................................... 111 35.2 Combination with SYNERGYR central unit OZW30..............
/127 Siemens Building Technologies Heating and D.h.w. Controller RVL482 Contents CE1P2542en 20.05.
1 Summary 1.1 Brief description and key features • The RVL482 is a multifunctional heating controller for use in residential and nonresidential buildings that have their own d.h.w. heating facility • Suited for: − Heating zone control with or without room influence via weather-compensated flow temperature control and, simultaneously, demand-compensated boiler temperature control − Precontrol via demand-compensated boiler temperature control.
1.2.2 Suitable room units • Room unit QAW50 • Room unit QAW70 1.2.3 Suitable actuators All types of actuators from Siemens with the following features can be used: • Electromotoric or electrohydraulic actuators with a running time of 0.5…14.5 minutes • 3-position control • Operating voltage AC 24…230 V 1.2.4 Communication Communication is possible with the following units: • All types of controllers from Siemens with LPB communication capability • SYNERGYR central unit OZW30 (software version 3.
2 Use 2.1 Types of plant The RVL482 is suitable for all types of heating plant that use weather-compensated flow temperature control. In addition, it can be used for demand-compensated control of the main flow. With regard to d.h.w. heating, the RVL482 is suited for plants with storage tanks or d.h.w. heating via heat exchangers (instantaneous d.h.w. heating) or via solar collector. Main applications: • Heating zones and d.h.w.
• • • • • • • • • • • • • • • • • • Own 7-day switching program for the release of d.h.w.
3 Fundamentals 3.1 Key technical features The RVL482 offers 2 key technical features: • The RVL482 has 5 heating circuit plant types and 4 d.h.w. plant types preprogrammed. When making use of all possible or practical combinations, there is a total of 21 plant types available • All functions and their settings are combined in the form of function blocks 3.1.
• Function block "D.h.w. storage tank" • Function block "3-position actuator for d.h.w." • Function block "Derivative action time d.h.w. heating via heat exchanger" • Function block “Multifunctional relay” • Function block "Legionella function" • Function block "Switching program 3" • Function block “Service functions and general settings” • Function block “Contact H2” • Function block "External inputs" • Function block “Solar d.h.w.
Notes Notes on the plant diagrams with the different types of space heating and d.h.w. circuits are given in the following sections: and indicate where and how the space heating circuit is connected to • Symbols the d.h.w. circuit. where: representing the flow representing the return • The numbers beneath these symbols indicate the type of d.h.w. circuit which can be combined 3.2.
Heating circuit plant type 3 Heating circuit control with mixing group, boiler control, maintained boiler return temperature with mixing valve Space heating with weather-compensated flow temperature control, 3-position control acting on the heating group mixing valve. Simultaneous demand-compensated control of the boiler temperature, 2- or 3-position control acting on the burner. Outside temperature signal from own outside sensor or data bus.
3.2.3 D.h.w. plant types D.h.w. plant type 0 No d.h.w. heating D.h.w. plant type 1 D.h.w. heating with charging pump Charging of d.h.w. storage tank through control of the charging pump. Acquisition of the d.h.w. temperature with one or 2 sensors or thermostats. Circulating pump, solar collector and/or electric immersion heater are optional.
D.h.w. plant type 4 D.h.w. heating with electric immersion heater Charging of d.h.w. storage tank only through release of the electric immersion heater. No control of d.h.w. heating by the controller. Circulating pump and solar collector are optional.
Siemens Building Technologies Heating and D.h.w. Controller RVL482 3 Fundamentals External inputs Contact H2 Service functions and general settings Multi-functional relay Legionella function Switching program 3 Derivative action time d.h.w. heating via heat exchanger Three-position actuator for d.h.w. D.h.w. storage tank Release, priority and flow temperature setpoint of d.h.w. Circulating pump Assigment of d.h.w. Integral action time maximum limitation of return temp.
3.4 Heating circuit operating modes The heating circuit operating mode is selected on the controller by pressing the respective button. Also, the operating mode can be changed by bridging terminals H1–M. 3.4.
3.6 Manual operation The RVL482 can be switched to manual operation. In that case, the control will be switched off. In manual operation, the various actuating devices behave as follows: • Heating circuit mixing valve: This mixing valve is active, but can be manually driven to any position by pressing the manual buttons / (close) and / (open). Heating circuit pump M2 is continuously running • Boiler: Plant types 1–x, 2–x, 3–x: Pump M2 is continuously running.
3.8 Operating state and operational level The user selects the required heating circuit operating mode by pressing the respective button. Each operating mode has a maximum of 2 operating states – with the exception of operating mode "Continuously NORMAL heating" (only one operating state possible). 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.
4 Acquisition of measured values 4.1 Room temperature (A6, B5) 4.1.1 Measurement The following choices exist: • A room temperature sensor QAA24 can be connected to terminal B5 • A room unit QAW50 or QAW70 can be connected to terminal A6 • 2 units can be connected to the terminals. In that case, the RVL482 can ascertain the average of the 2 measurements. The other room unit functions will not be affected by averaging 4.1.
4.2.2 Handling faults A short-circuit or open-circuit in the measuring circuit is identified and indicated as a fault. In that case, the plant responds as follows: • The circulating pump M2 continues to run • The mixing valve will close 4.3 Boiler temperature (B2) 4.3.1 Measurement The boiler temperature is required with plant types 2–x, 3–x, 4–x and 5–x. It is acquired with a sensor having a sensing element LG-Ni 1000. 4.3.
4.5 Return temperature (B7) 4.5.1 Measurement The return temperature is acquired with a sensor having a sensing element LG-Ni 1000. This measured value is required for the minimum or maximum limitation of the return temperature. In interconnected plants, the return temperature with plant type 1–x can be acquired via the data bus from the same segment. Controllers with plant type 1–x and connected sensor pass the return temperature signal of the common return to the data bus. 4.5.
4.7 D.h.w. storage tank temperature (B31, B32) 4.7.1 Measurement The storage tank temperature can be acquired as follows: • With one or 2 sensors having a sensing element LG-Ni 1000, or • With one or 2 thermostats This means that there are 2 measuring circuits available. 4.7.2 Handling faults The controller's response to faults in the measuring circuits depends on the type of d.h.w. demand (setting on operating line 126): • One d.h.w.
4.8 Collector temperature (B6) 4.8.1 Measurement The collector temperature is acquired via a sensor with sensing element LG-Ni 1000 and an extended measuring range. 4.8.2 Handling faults An error message is generated and the collector pump deactivated with a delay of 12 hours in case of a short-circuit or open-circuit in the measuring circuit. There is no solar d.h.w. heating. 4.9 Solar sensor (U1) 4.9.1 Measurement Solar radiation is acquired with a solar sensor.
5 Function block "Enduser space heating" This function block contains settings that the enduser himself can make. 5.
5.4 Holiday program A maximum of 8 holiday periods per year can be programmed. At 00:00 of the first 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 RVL482 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.
6 Function block "Enduser d.h.w." This function block contains settings for d.h.w. heating that the enduser himself can make. 6.1 Line 26 27 28 Operating lines Function, parameter Setpoint of NORMAL d.h.w. temperature D.h.w. temperature Setpoint of REDUCED d.h.w. temperature 6.2 Factory setting (Range) 55 (20…100) Display function 40 (8…80) Unit °C °C Setpoint The NORMAL and REDUCED setpoints of the d.h.w. temperature are to be entered in °C.
7 Function block "Enduser general" This function block contains settings that the enduser himself can make, as well as indication of faults. 7.1 Line 31 32 33 34 35 36 37 38 39 40 41 50 7.
7.4 Indication of errors The following errors are indicated: Number Fault 10 Fault outside sensor 11 Fault solar sensor 12 Fault wind sensor 20 Fault boiler temperature sensor 30 Fault flow temperature sensor 40 Fault return temperature sensor (primary circuit) 50 Fault storage tank temperature sensor/control thermostat 1 52 Fault storage tank temperature sensor/control thermostat 2 54 Fault d.h.w.
8 Function block "Plant type" This function block contains the selection of the plant type. 8.1 Line 51 8.2 Operating line Function, parameter Factory setting (range) Unit 2−1 (1−0…5−4) Plant type 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.
9 Function block "Type of heat source" This function block contains the selection of the type of heat source which is important for direct burner control. 9.1 Line 54 9.2 Operating line Function, parameter Type of heat source Factory setting (range) 2 (1…3) Unit Setting When commissioning the installation, the relevant type of heat source must be selected.
10 Function block "Modulating burner" On this function block, the control parameters of boiler temperature control for the modulating burner can be set. 10.1 Line 55 56 57 58 Operating lines Function, parameter Running time of damper actuator P-band of modulating control (Xp) Integral action time of modulating control (Tn) Derivative action time of modulating control (Tv) Factory setting (range) 60 (7.5…480) 20 (1…200) 150 (10…500) 4.
11 Function block "Cascade slave" This function block enables the controller to be integrated in a heat source cascade as a cascade slave. A heat source cascade is the combination of several oil- / gas-fired boilers. 11.1 Line 59 60 Operating lines Function, parameter Release integral for boiler sequence Reset integral of boiler sequence 11.
12 Function block "Space heating" This function block performs the ECO function, the optimization functions with boost heating and quick setback, as well as the room influence. 12.
TA (B9 rsp. BUS) TA TAM kt TAD 2522B02 kt Generation of the composite and attenuated outside temperature TA TAD TAM kt Actual outside temperature Attenuated outside temperature Composite outside temperature Building time constant TA 25 TA 20 TAD 15 TAM 10 2522D17 5 0 t Progression of the actual, composite and attenuated outside temperature TA TAD TAM t Actual outside temperature Attenuated outside temperature Composite outside temperature Time 12.2.
Switching the heating on The heating will be switched on again only when all 3 of the following conditions are satisfied: • The actual outside temperature has fallen 1 °C below the current ECO heating limit • The composite outside temperature has fallen 1 °C below the current ECO heating limit • The attenuated outside temperature has fallen 1 °C below the "ECO day" heating limit Operating modes and operating statuses The ECO function is performed depending on the operating mode: Operating mode or operati
With room sensor Using a room sensor or room unit, it is possible to have optimum start and optimum stop control. To be able to optimally determine the switch-on and switch-off points, optimization needs to "know" the building's heating up and cooling down characteristics, always as a function of the prevailing outside temperature. For this purpose, optimization continually acquires the room temperature and the outside temperature.
TRw TRM 2522D18 TRw TRw t1 Progression of the room temperature generated by the room model e kt t t1 TAM 2.71828 (basis of natural logarithms) Building time constant in hours Time in hours Quick setback Composite outside temperature 12.4.5 TR TRM TRw TRw Room temperature Room model temperature Setpoint of NORMAL room temperature Setpoint of REDUCED room temperature Optimum stop control During the building's occupancy time, the RVL482 maintains the setpoint of NORMAL heating.
Optimum start control with the room model takes place only if, previously, quick setback took place. Optimum start control can be deactivated by entering 0 hours as the maximum heating up period. 12.4.8 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 does not affect the latter.
12.5 Room functions 12.5.1 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 room influence. If the room temperature lies above the limit value, the display shows .
12.6 Heating curve 12.6.1 Purpose With the space heating systems (plant types 1–x, 2–x, and 3–x), flow temperature control is always weather-compensated. The assignment of the flow temperature setpoint to the prevailing outside temperature is made via the heating curve. 12.6.2 Basic setting Adjustment with the little bar 2540Z09 The heating curve is adjusted with the little bar, or via 2 operating lines.
12.6.3 Deflection The heat losses of a building are proportional to the difference between room temperature and outside temperature. By contrast, the heat output of radiators does not increase proportionally 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 properties into consideration. In the range of small slopes (e.g.
12.6.
13 Function block "3-position actuator heating circuit" This function block provides weather-compensated 3-position control of the heating circuit. It acts in plant types 1–x, 2–x and 3–x. 13.
13.2.3 Impact of d.h.w. heating Limitation of the rate of increase acts independently of d.h.w. heating. 13.3 3-position control 3-position control operates as weather- or demand-compensated PI flow temperature control. The flow temperature is controlled through a modulating actuating device (slipper or seat valve). Owing to the I-part, there is no control offset. The controller’s positioning commands to the actuating device are delivered to the output relays and indicated by LEDs. 13.
14 Function block "Boiler" Function block "Boiler" acts as a 2- or 3-position controller and is used for direct burner control. The function block operates as a demand-compensated boiler temperature controller of a common flow, which supplies heat to one or several consumers. 14.
14.3 Limitations 14.3.1 Maximum limitation of the boiler temperature For maximum limitation of the boiler temperature, the maximum limit value can be adjusted. The switch-off point cannot exceed the maximum limit value. The switch-on point will then be lower by the amount of the set switching differential. If the return temperature is limited to a maximum, the display shows . This maximum limitation cannot be used as a safety function; for that purpose, thermostats, thermal reset limit thermostats, etc.
TKx TK TKw + 0,5×SD TKw TKw - 0,5×SD t YB 2540D10 1 0 SD t TK TKw TKx YB Setting note Switching differential Time Boiler temperature Boiler temperature setpoint Actual value of boiler temperature Burner control signal When controlling a single-stage burner, the reset integral of the second stage should be set to zero. 14.4.
boiler temperature stays above the setpoint by half the switching differential. It continually generates the reset integral based on time and the progression of temperature. When the reset integral reaches the set maximum limit, the second burner stage will be locked and the first stage switched off. The minimum locking time and calculation of the release integral at x < w − 0.5 × SD are started when the switch-on command for the first burner stage is given.
14.5 Control with a modulating burner When using a modulating burner, the boiler temperature is controlled by switching the basic stage (2-position control) and by controlling the damper actuator of the modulating burner (3-position control). 14.5.1 Setting parameters In addition to the adjustable variables used with the 2-stage burner, the setting parameters according to chapter "10 Function block "Modulating burner"” are required for the control of a modulating burner.
14.7 Protective boiler startup 14.7.1 Plant types 2–x and 4–x: If the boiler temperature falls below the minimum limit of the boiler temperature while the burner is running, the differential (minimum limit value minus actual value) will be integrated. From this, a critical locking signal will be generated and transmitted to the connected loads. This causes the loads to reduce their setpoints, thus consuming less energy.
14.8 Protection against boiler overtemperatures 2522D13e To prevent heat from building up in the boilers (protection against overtemperatures), the RVL482 offers a protective function. When the first burner stage is switched off, the controller allows pump M1 to overrun for the set pump overrun time (operating line 174 on the boiler temperature controller), generating at the same time a forced signal to all loads (inside the controller on the data bus).
15 Function block "Pump M1" This function block provides control of pump M1. This pump can be used either as a circulating pump or bypass pump, each with selectable control criteria. 15.1 Line 99 100 Operating lines Function, parameter Operating mode of pump M1 Switching differential of bypass pump 15.2 Factory setting (range) 1 (0…3) 6 (1…20) Unit °C Description Depending on the plant type, pump M1 is used either as a circulating or bypass pump. 15.2.
16 Function block "Setpoint of return temperature limitation" On this function block, the setpoint of minimum and maximum limitation of the return temperature or the bivalent starting point can be set. 16.1 Line 101 Operating line Function, parameter Setpoint of return temperature limitation / bivalent starting point 16.
17 Function block "Type of limitation of return temperature" This function block is used to select the type of limitation with the plant types that permit a choice of minimum or maximum limitation of the boiler return temperature. 17.1 Line 102 Operating line Function, parameter Type of limitation of return temperature 17.
If minimum limitation of the return temperature is active, the display shows . Minimum limitation of the return temperature can be deactivated. Section “30.4.7 Gain of locking signal” provides information on which the critical locking signal is sent to and how the loads respond to it. The minimum limit value is to be set on operating line 101. Setting --- = (inactive) Mode of operation with a single device (with no bus) 2524B0 3e 17.4.
17.4.4 Minimum limitation through reduction of the consumer setpoints, with inclusion of the bypass pump This kind of minimum limitation only acts with plant types 2–x and 4–x. It comprises 2 functions: • On the one hand, minimum limitation is accomplished through a reduction of the consumer setpoints.
For this type of application, sensor B7 must be located in the heating circuit’s return (upstream of the mixing point in the return), as shown below. Y1 B1 2526S06 M2 B7 B1 B7 M2 Y1 Heating circuit flow temperature sensor Return temperature sensor Heating circuit pump Heating circuit mixing valve 17.5.2 Maximum limitation acting on the boiler This kind of maximum limitation is possible with plant types 2–x and 4–x. In the case of bivalent plant (e.g.
18 Function block "Bivalent maximum limitation of the return temperature" This function block is used for setting the parameters required for the bivalent plant types 2–x and 4–x. 18.1 Line 103 104 Operating lines Function, parameter Maximum setback of boiler setpoint End point bivalent 18.
19 Function block "3-position actuator mixing circuit" This function block is used with plant types 3–x and 5–x to set the control parameters of the mixing circuit. 19.1 Line 108 109 110 Operating lines Function, parameter Actuator running time P-band of control (Xp) Integral action time of control (Tn) 19.2 Factory setting (range) 120 (30…873) 32.0 (1…100) 120 (10…873) Unit s °C s Control The 3-position controller provides PI control.
20 Function block "Integral action time maximum limitation of the return temperature" On this function block, the integral action time of maximum limitation of the return temperature can be set with plant types 1–x. 20.1 Line 114 Operating lines Function, parameter Integral action time of maximum limitation of the return temperature 20.
21 Function block "Assignment of d.h.w. heating" This function block is used to select the heating circuits for which the d.h.w. is heated and according to which program the d.h.w. circulating pump shall run. 21.1 Line 121 Operating lines Function, parameter Assignment of d.h.w. heating 21.2 Factory setting (range) 0 (0…2) Unit Assignment of d.h.w. heating Operating line 121 is used to select for which heating circuits the d.h.w.
22 Function block "Circulating pump" Based on the settings made, function block "Circulating pump" determines at what times the circulating pump will run. 22.1 Line 122 Operating line Function, parameter Program for the circulating pump 22.1.1 Factory setting (range) 2 (0…3) Unit General mode of operation On operating line 122, it can be entered according to which time schedule the d.h.w. circulating program shall run. The use of a circulating pump is optional with all types of plant.
22.
23 Function block "Release, priority and flow temperature setpoint of d.h.w." Based on the settings made, function block “Release, priority and flow temperature setpoint of d.h.w.” determines • at what times d.h.w. is released to be heated to the NORMAL d.h.w. temperature setpoint • the type of priority of d.h.w. heating (absolute, shifting, or parallel) • generation of the setpoint of the common flow temperature (d.h.w., maximum selection) 23.
23.2.2 Release programs Depending on the setting made on operating line 123, release of d.h.w. heating takes place at the following times: Setting 0 1 2 D.h.w. heating is released Continuously (24 hours a day) According to one or several heating programs According to switching program 2 of own controller With setting 1, d.h.w release depends on the setting made on operating line 121.
23.3 Priority and flow temperature setpoint 23.3.1 Settings Operating line 124 D.h.w. priority Flow temperature setpoint according to 0 1 2 3 4 Absolute Shifting Shifting None (parallel) None (parallel) D.h.w. D.h.w. Maximum selection D.h.w. Maximum selection 23.3.2 D.h.w. priority Depending on the capacity of the heat generating equipment, it may be practical to reduce the amount of heat drawn by the heating circuit(s) during d.h.w. heating, thus ensuring that the required d.h.w.
dependent uncritical locking signal in the range 0…100 % generated. If the heat source is located in segment 0, it delivers 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. 23.3.5 No priority No priority means parallel operation. D.h.w. charging has no impact on the heating circuits. 23.3.
24 Function block "D.h.w. storage tank" Based on the settings made, this function block performs all d.h.w. functions required for the plant types with d.h.w. storage tank. Although plant types x–4 have a d.h.w. storage tank, this function block is not active (except operating line 126), since the electric immersion heater provides the functions independent of the RVL482. The settings for solar d.h.w.
With plant types 4–x and 5–x, setting 1 on operating line 125 makes no sense, since there is no own heating circuit. In that case, changeover to the electric immersion heater would take place at midnight at the latest, after 48 hours of operation. 24.3 D.h.w. temperature and d.h.w. switching differential The kind of d.h.w. storage tank temperature acquisition must be selected on operating line 126. In plant types x–4 without solar heating, select setting 0, 1, 2 or 3 on operating line 126, although d.h.
Determination of the switch-off temperature (end of d.h.w. charging): Operating line 126 Measurement Switching criterion 0 1 sensor TBWx1 > TBWw 1 2 sensors TBWx1 > TBWw und TBWx2 > TBWw 2 1 thermostat Thermostat contact B31 open 3 2 thermostats Both thermostats contact B31 and B32 open 4 1 sensor, solar d.h.w. heating TBWx1 > TBWw 5 2 sensors, solar d.h.w. heating TBWx1 > TBWw and TBWx2 > TBWw SDBW TBWw TBWx1 TBWx2 D.h.w. switching differential (operating line 128) D.h.w.
TBW TBWw TBWw - SDBW 2541D03 t BWL ON OFF tLmax BWL ON OFF t tLmax TBW TBWw SDBW tLmax t D.h.w. charging locked D.h.w. charging D.h.w. charging ON D.h.w charging OFF Time Maximum charging time D.h.w. temperature D.h.w temperature setpoint Switching differential d.h.w. 24.6 Setpoint of the legionella function On operating line 130, the setpoint of the legionella function can be adjusted. This function raises the d.h.w.
24.8 Protection against discharging 24.8.1 Purpose With plant types using a d.h.w. storage tank, protection against discharging is ensured during overrun of the d.h.w. charging pump. This function makes certain that the d.h.w. will not cool down again during pump overrun. 24.8.2 Mode of operation With storage tank sensor(s) If the flow temperature is lower than the d.h.w. storage tank temperature, pump overrun will be terminated prematurely (plant types x–1 and x–2).
25 Function block "3-position actuator for d.h.w." With plant types x–2 and x-3, this function block provides 3-position control of d.h.w. heating. 25.1 Line 132 133 134 135 136 Operating lines Function, parameter Flow temperature boost mixing valve / heat exchanger Actuator opening time Actuator closing time P-band of control (Xp) Integral action time of control (Tn) 25.2 Factory setting (range) 10 (0…50) 120 (10…873) 120 (10…873) 32.
26 Function block "Derivative action time d.h.w. heating via heat exchanger" With plant types x–3, this function block permits the entry of the D-part for d.h.w. control. 26.1 Line 137 Operating line Function, parameter Derivative action time of control (Tv) 26.2 Factory setting (range) 0 (0…255) Unit s Description The 3-position controller provides PID control. The derivative action time Tv (D-part) can be adjusted on operating line 137.
27 Function block "Multifunctional relay" The RVL482 has a multifunctional relay whose function is to be selected on this block. This relay is also used for control of the electrical immersion heater for d.h.w. and for the CLOSE signal required for the damper actuator of the modulating burner. This means that, if the parameters of the controller are set to "Electrical actuator only" (plant type x–4), or to changeover operation, the relay cannot be used for any other functions.
27.2.3 ON / OFF according to the time switch The multifunctional relay is energized and deenergized according to the time switch entered on operating line 146. With the plant types that have no own heating circuit (4–x and 5–x), the setting "According to the heating program" makes no sense, since these types of plant have no heating program. In that case, the multifunctional relay is always deenergized. 27.2.
28 Function block "Legionella function" When using d.h.w. systems with storage tank, this function prevents legionella bacteria. This is accomplished by periodically raising the d.h.w. temperature to a higher level. 28.1 Line 147 148 149 150 Operating lines Function, parameter Periodicity of the legionella function Point in time of legionella function Dwelling time at the legionella setpoint Circulating pump operation during the legionella function 28.1.
28.2 Mode of operation Preconditions for the legionella function: • The d.h.w. storage tank temperature is acquired with 1 or 2 sensors (the legionella function cannot be provided when using thermostats) • Charging takes place instantaneously with the heating water and not with the electric immersion heater • A legionella setpoint is adjusted lit) • D.h.w.
29 Function block "Switching program 3" Switching program 3 of this function block can be used for one or several of the following functions: • As a time switch program for the circulating pump (operating line 122) • As a time switch program for the multifunctional relay (operating lines 141 and 146) 29.
30 Function block "Service functions and general settings" This function block is used to combine various displays and setting functions that are of assistance in connection with commissioning and service work. In addition, a number of extra functions are performed. The service functions are independent of the type of plant. 30.1 Operating lines Line Function, parameter 161 Outside temperature simulation Factory setting (range) Unit --.- (--.
Generation of the flow temperature setpoint Parallel displacement of heating curve, operating line 72 Heating curve 1+s TV TAM TVS TVS TVw s TAM Flow temperature setpoint, operating line 165 2541B04e 1+s Setting knob on controller s TAM TVS TVw Slope Composite outside temperature Flow temperature setpoint (generated via the heating curve) Flow temperature setpoint 30.2.
During the temperature simulation, the actual outside temperature (as acquired by the sensor or via LPB) will be overridden. When the simulation is terminated, the actual outside temperature will gradually readjust the composite and the attenuated temperatures to their correct values. The simulation of the outside temperature therefore causes a reset of the attenuated and the composite outside temperatures. There are 3 choices to terminate the simulation: • Entry of --.
Input 2 3 4 5 6 7 8 9 A Display SET Setpoint of room temperature. With the plant types with no heating circuit, the display shows --Setpoint of room temperature. With the plant types with no rooms, the display shows --Minimum limit value of the return temperature. If no return temperature limitation is used, the display shows --Maximum limit value of the return temperature. If no return temperature limitation is used, the display shows --Setpoint of the d.h.w. flow temperature.
30.4 Auxiliary functions 30.4.1 Frost protection for the plant The plant can be protected against frost. For that, the controller and the heat source must be ready to operate (mains voltage present!).
TV w y x tA 2540D12 tA tA t1 t t1 t2 tA Time Start of error display End of error display Waiting time (set on operating line 171) t2 TV w x Y t Flow or boiler temperature Setpoint Actual value Setpoint band • At t1, an error message is triggered; during the period of time tA (set on operating line 171), the actual value stayed below the setpoint band “y” • At t2, the error message is reset; the actual value “x” has reached the setpoint band “y” 30.4.
30.4.5 Pump kick To prevent pump seizing during longer off periods (e.g. in the summer), it is possible to activate periodic pump runs: The input is either 0 or 1: 0 = no periodic pump kick 1 = periodic pump kick activated If the pump kick is activated, all pumps run for 30 seconds, one after the other, every Friday morning at 10:00, independent of all other functions and settings. 30.4.6 Winter- / summertime changeover The change from wintertime to summertime, and vice versa, is made automatically.
Minimum limitation of the return temperature can also be provided locally by a controller with plant type 1–x. In that case, the critical locking signal only acts inside the controller and is only delivered to the own heating and d.h.w. circuit. With regard to the response of the consumers and heat converters, there are 2 choices: • Heat converters and consumers with mixing valves: The flow temperature setpoint will be reduced as a function of the set locking signal gain.
30.5.2 Outside temperature source If, in interconnected plants, the outside temperature is delivered via the bus, the temperature source can be addressed either automatically or directly (operating line 180). • Automatic addressing: Display, entry Explanation SET A (For automatic addressing) ACTUAL xx.yy Display of source address selected by automatic addressing: xx = segment number yy = device number • Direct addressing: To be entered is the source address: xx.
30.5.4 Bus power supply In interconnected plants with a maximum of 16 controllers, the bus power supply may be decentralized, that is, power may be supplied via each connected device. If a plant contains more than 16 devices, a central bus power supply is mandatory. On each connected device, it is then necessary to set whether the data bus is powered centrally or decentrally by each controller. With the RVL482, this setting is made on operating line 179.
31 Function block "Contact H2" This function block is used to enter the plant section on which the heat demand of contact H2 acts. 31.1 Line 184 Operating lines Function, parameter Function when terminals H2–M are bridged 31.2 Factory setting (range) 0 (0 / 1) Unit Description Flow / boiler control can be overridden by using a simple remote operation facility. This is accomplished by bridging terminals H2–M.
32 Function block "External inputs" This function block handles the external inputs and some of the display functions. 32.
• Direct addressing: To be entered is the source address: xx.yy xx = segment number yy = device number If the controller is operated autonomously (with no bus), there will be no display and no entry can be made. If the controller is used in an interconnected plant and if it its operating line 188 is set to solar sensor, it is not possible to enter an address (if an entry is made, the display shows OFF). In that case, the controller always uses the solar radiation signal delivered by its own sensor.
• Direct addressing: To be entered is the source address: xx.yy xx = segment number yy = device number If the controller is operated autonomously (with no bus), there will be no display and no entry can be made. If the controller is used in interconnected plant and if its operating line 191 is set to wind effect sensor, it is not possible to enter an address (if an entry is made, the display shows OFF). In that case, the controller always uses the wind speed signal delivered by its own sensor.
33 Function block "D.h.w. solar charging" The RVL482 supports solar d.h.w. heating with the d.h.w. plant types 1, 2 and 4. The function is activated on operating line 126 by selecting the d.h.w. temperature sensor. This always enables solar d.h.w. charging, carried out via the collector pump based on the temperature differential between d.h.w. storage tank and collector temperature. The lower storage tank sensor B32 is used for solar charging control.
2541D14 T TKol SDON SDOFF TSp TLmin ON OFF t TKol ON/OFF SDON SDOFF TSp TLmin T t Collector temperature Collector pump Temperature differential ON Temperature differential OFF Storage tank temperature Minimum charging temperature Temperature Time • The storage tank is charged if the collector temperature exceeds the current storage temperature by the switch-on differential: TKol > TSp + SDON • Storage tank charging is stopped if the collector temperature drops below the temperature differential: TKol
33.2.3 Minimum runtime 2541D07 When the collector pump is switched on, it remains on for min. runtime tMin = 20 s. This minimum runtime is enabled for all functions activating the collector pump. tMin fSolar ON OFF t fSolar ON/OFF tMin Collector pump switch-off is delayed by the minimum runtime after the frost protection limit is reached to rinse the flow pipe between collector to storage tank with hot water.
33.2.5 Collector temperature to protect against overheating 2541D15 Operating line 204 allows for setting the temperature protecting the collector against overheating. If there is a risk of overheating at the collector, storage tank charging is continued past the charging temperature maximum limitation (set on operating line 206) to the storage tank temperature maximum (set on operating line 207) to reduce the amount of surplus heat.
SDON TRk 2541D10 T TSp 2K 1K 1K TKol ON OFF t SDON TRk TSp TKol ON/OFF T t Temperature differential ON Recooling setpoint Storage tank temperature Collector temperature Collector pump Temperature Time • The collector pump is switched on if the storage tank temperature is at least 2 K above the recooling setpoint and above the collector temperature by temperature differential ON.
• The collector pump is switched off if the collector temperature exceeds the evaporation temperature: TKol > TVerd • The collector pump is again switched on if the collector temperature drops below the evaporation temperature by 15 K: TKol < TVerd – 15 K Setting --- switches off the pump protection function. The heat carrier evaporation protection (pump off) takes priority over overheating protection which would switch on the pump. 33.2.
2541D13 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 stationary temperature by 1 °C. T 1K TKol t < Grad ON OFF t TKol Grad ON/OFF T t Collector temperature Gradient Collector pump Temperature Time Setting --- switches off the collector start function. 108/127 Siemens Building Technologies Heating and D.h.w. Controller RVL482 33 Function block "D.h.
34 Function block "Locking functions" Function block “Locking functions” allows all settings to be locked on the software side. 34.1 Line 248 Operating line Function, parameter Locking of settings 34.2 Factory setting (range) 0 (0 / 1) Unit Description On operating line 248, the settings made on the controller can be locked on the software side. This means that the settings made can still be called up on the controller, but cannot be changed. Locking comprises all settings.
35 Communication 35.1 Combination with room units 35.1.1 General • Room units can be used with the RVL482 only if one of the plant types 1–x, 2–x, or 3–x has been selected on the controller • The room temperature acquired by a room unit is adopted by the RVL482 at terminal A6. If the room temperature signal delivered by the room unit shall not be considered by the control functions, the respective source needs to be selected (operating line 65).
Knob for room temperature readjustments Using the knob of the QAW50, the room temperature setpoint of NORMAL heating can be readjusted by ±3 °C. The adjustment of the room temperature setpoint on the controller's operating line 1 will not be affected by the QAW50. 35.1.
Knob for room temperature readjustments With the knob of the QAW70, the room temperature setpoint of NORMAL heating can be readjusted by ±3 °C. The adjustment of the room temperature setpoint on the controller's operating line 1 will not be affected by the QAW70. Effect of individual QAW70 operating lines on the RVL482 If 1 (slave with no remote operation) is entered on operating line 178 (source of time of day) of the RVL482, the time of day on the QAW70 cannot be changed.
Note For detailed information about the QAW70 room unit, refer to installation instructions G1637 (74 319 0173 0).
Handling 36.1 Operation 36.1.
Operating instructions The operating instructions are inserted in a holder at the rear of the cover. When in their proper place, the list of operating lines that can be selected by the enduser is visible. The operating instructions are designed for use by janitors and endusers. They also contain tips on energy savings and troubleshooting. 36.1.2 Analog operating elements Buttons for selecting the heating circuit's operating mode For the selection of the operating mode, there are 4 buttons available.
36.1.3 Digital operating elements Operating line principle The entry and readjustment of all setting parameters, the activation of optional functions and the reading of actual values and states 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 selection of an operating line and readjustment of the display is always made with a pair of buttons.
Access rights • The enduser can access all analog operating elements. This means that he can select the operating mode, set the heating curve, readjust the room temperature with the setting knob, and activate manual operation. Also, he can access operating lines 1 to 50 • The heating engineer can access all operating elements and all operating lines 36.2 Commissioning 36.2.
36.3.
37 Engineering 37.1 Connection terminals B3 B2 B31 B9 1 2 3 4 5 6 7 8 9 10 B7 11 U1 H2 U2 B6 B32 B5 12 M 13 14 15 16 17 18 19 20 M N L 1 2 F4 K4 F5 K5 Q5 F3 Q1 Q3 3 4 5 6 7 8 9 10 F1/ Y1 Y2 F7 Q2 Q4 K6 F6 Y7 Y8 F2 11 12 13 14 15 16 17 18 19 20 2542Z02 N 37.1.
37.2 Basic connections for plant types with external heat demand signals 2542A01 Low-voltage side Connection diagrams A6 B9 B1 B3 B2 D1 D2 B M B M B M B M B7 B31 B M B32 S1 B M B M B5 B M S2 AC 230 V B1 M B3 B2 B31 B7 M H1 B32 B5 M B6 B M - + - + L DB MB A6 MD B9 DC 0...10 V LPB DC 0...10 V L U2 B6 U1 H2 N N1 N L DC 22...
38 Mechanical design 38.1 Basic design The controller is consists of controller insert, which accommodates the electronics, the power section, the output relays and – on the front – all operating elements, and the base, which carries the connection terminals. The operating elements are located behind a lockable transparent cover. On the inner side of the cover, there is a holder in which the Operating Instructions can be inserted. All values are read in the display (LCD) featuring background lighting.
39 Technical data Power supply Rated operating voltage Frequency Power consumption (no external load) Supply line fusing AC 230 V (±10 %) 50 Hz max. 9 VA 10 A Output relays Switching capacity Switching current K4, K5, Q1, Y1, Y2, Y7, Y8 Switching current Q5, Q3, Q2 Q4, K6 Rated current of ignition transformer Switch-on current of ignition transformer AC 24…230 V AC 0.02…2 (2) A AC 0.02…1 (1) A max.1 A (max. 30 s) max.10 A (max.
Index 2 2-position control....................................................... 55 3 3-position actuator d.h.w........................................... 81 3-position actuator maximum limitation of the return temperature............................................................... 67 3-position control....................................................... 52 A absolute priority......................................................... 74 access rights ...................................................
E ECO function .............................................................41 ECO heating limits.....................................................42 economy button.......................................................111 economy button.......................................................110 electric immersion heater ..........................................83 electronics ...............................................................121 end point bivalent ............................................
integral action time maximum limitation of the return temperature............................................................... 68 O occupancy time ...................................................83, 84 ON periods ................................................................87 open-circuit................................................................27 K key features ........................................................ 13, 17 knob ..............................................................
recooling storage tank (solar)..................................105 source of solar radiation ........................................... 99 reduction of the flow temperature setpoint ................47 relay test....................................................................90 source of time of day ................................................ 95 storage tank recooling (solar) ................................. 105 release integral for boiler sequence ..........................
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 127/127 Building Technologies Heating and D.h.w. Controller RVL482 CE1P2542en 20.05.
