Siemens RVL481 Operator's manual

Edition: 1.0
Controller series: A
CE1P2541en
20.05.2008 Building Technologies
Heating and D.h.w. Controller RVL481
Basic Documentation

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Siemens Heating and D.h.w. Controller RVL481 CE1P2541en
Building Technologies 20.05.2008
Siemens Switzerland Ltd
Building Technologies Group
International Headquarters
Gubelstrasse 22
CH – 6301 Zug
Tel. [phone]
Fax [phone]
www.sbt.siemens.com
© 2008 Siemens Switzerland Ltd
Subject to alteration

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Building Technologies Contents 20.05.2008
Contents
1Summary......................................................................................................11
1.1 Brief description and key features.................................................................11
1.2 Equipment combinations...............................................................................11
1.2.1 Suitable sensors............................................................................................11
1.2.2 Suitable room units........................................................................................12
1.2.3 Suitable actuators..........................................................................................12
1.2.4 Communication..............................................................................................12
1.2.5 Passing on of heat demand signal ................................................................12
1.2.6 Product documentation..................................................................................12
2Use................................................................................................................13
2.1 Types of plant................................................................................................13
2.2 Types of houses and buildings......................................................................13
2.3 Types of heating systems..............................................................................13
2.4 Functions.......................................................................................................13
3Fundamentals..............................................................................................15
3.1 Key technical 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 REDUCED heating..................................................................22
3.4.3 Continuously NORMAL heating.....................................................................22
3.4.4 Protection mode ............................................................................................22
3.5 D.h.w. operating mode ..................................................................................22
3.6 Manual operation...........................................................................................23
3.7 Plant type and operating mode......................................................................23
3.8 Operating state and operational level............................................................24
4Acquisition of measured values ................................................................25
4.1 Room temperature (A6, B5)...........................................................................25
4.1.1 Measurement.................................................................................................25
4.1.2 Handling faults...............................................................................................25

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4.1.3 Room model...................................................................................................25
4.2 Flow and boiler temperature (B1) ..................................................................25
4.2.1 Measurement.................................................................................................25
4.2.2 Handling faults...............................................................................................26
4.3 Outside temperature (B9) ..............................................................................26
4.3.1 Measurement.................................................................................................26
4.3.2 Handling faults...............................................................................................26
4.4 Primary return temperature (B7)....................................................................26
4.4.1 Measurement.................................................................................................26
4.4.2 Handling faults...............................................................................................27
4.5 Secondary return temperature (B71).............................................................27
4.5.1 Measurement.................................................................................................27
4.5.2 Handling faults...............................................................................................27
4.6 D.h.w. flow temperature (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
5Function 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 Holiday program.............................................................................................30
6Function block "Enduser d.h.w." ...............................................................31
6.1 Operating lines...............................................................................................31
6.2 Setpoint..........................................................................................................31
6.3 Actual value ...................................................................................................31
7Function block "Enduser general".............................................................32
7.1 Operating lines...............................................................................................32
7.2 Switching program 2......................................................................................32
7.3 Time of day and date.....................................................................................32
7.4 Indication of errors.........................................................................................33
8Function block "Plant type"........................................................................34

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8.1 Operating line................................................................................................34
8.2 General..........................................................................................................34
9Function block "Cascade slave"................................................................35
9.1 Operating lines ..............................................................................................35
9.2 Mode of operation..........................................................................................35
9.2.1 Boiler sequence release integral (KFI)..........................................................35
9.2.2 Boiler sequence reset integral (KRI)..............................................................35
10 Function block "Space heating"................................................................36
10.1 Operating lines ..............................................................................................36
10.2 ECO function.................................................................................................36
10.2.1 Compensating variables and auxiliary variables ...........................................36
10.2.2 Heating limits.................................................................................................37
10.2.3 Mode of operation..........................................................................................37
10.2.4 Operating modes and operating states .........................................................38
10.3 Room temperature 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
10.6.2 Basic setting..................................................................................................43
10.6.3 Deflection.......................................................................................................44
10.6.4 Parallel displacement of heating curve..........................................................45
10.6.5 Display of setpoints .......................................................................................45
10.7 Generation of setpoint...................................................................................46
10.7.1 Weather-compensated control ......................................................................46
10.7.2 Demand-compensated control ......................................................................46
11 Function block "3-position actuator heating circuit"...............................47
11.1 Operating lines ..............................................................................................47
11.2 Limitations .....................................................................................................47
11.2.1 Flow temperature limitations..........................................................................47

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11.2.2 Setpoint rise...................................................................................................48
11.3 3-position control............................................................................................48
11.4 Excess mixing valve or heat exchanger temperature....................................49
11.5 Pulse lock.......................................................................................................49
12 Function block "Boiler"...............................................................................50
12.1 Operating lines...............................................................................................50
12.2 Operating mode.............................................................................................50
12.3 Limitations......................................................................................................50
12.3.1 Maximum limitation of the boiler temperature................................................50
12.3.2 Minimum limitation of the boiler temperature.................................................51
12.3.3 Actions during d.h.w. heating.........................................................................51
12.4 2-position control............................................................................................51
12.4.1 Control with a single-stage burner.................................................................51
12.4.2 Control with a 2-stage burner.........................................................................52
12.4.3 Frost protection for the boiler.........................................................................53
12.4.4 Protective boiler startup.................................................................................54
12.4.5 Protection against boiler overtemperatures...................................................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 Function block "District heat"....................................................................58
14.1 Operating lines...............................................................................................58
14.2 Limitations......................................................................................................58
14.2.1 Maximum limitation of the primary return temperature ..................................58
14.2.2 Maximum limitation of return temperature differential (DRT limitation)..........59
14.2.3 Integral action time.........................................................................................60
14.2.4 Minimum stroke limitation (suppression of hydraulic creep)..........................60
14.2.5 Flow limitation................................................................................................60
15 Function block "Maximum limitation of the return temperature, d.h.w."61
15.1 Operating line.................................................................................................61
15.2 Purpose..........................................................................................................61
15.3 Function.........................................................................................................61
16 Function block "Basic settings d.h.w." .....................................................62

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16.1 Operating lines ..............................................................................................62
16.2 Assignment of d.h.w. heating ........................................................................62
16.3 Program for the circulating pump ..................................................................62
16.3.1 General mode of operation............................................................................62
16.3.2 Operation of circulating pump during the holiday period...............................63
16.4 Frost protection for d.h.w...............................................................................64
16.4.1 Frost protection in the d.h.w. storage tank ....................................................64
16.4.2 Frost protection in the d.h.w. storage tank flow.............................................64
16.4.3 Frost protection for the secondary d.h.w. flow...............................................64
17 Function block "Release of d.h.w. heating"..............................................65
17.1 Operating line................................................................................................65
17.2 Release .........................................................................................................65
17.2.1 Function.........................................................................................................65
17.2.2 Release programs.........................................................................................66
17.2.3 D.h.w heating during the holiday period........................................................66
18 Function 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 D.h.w. charging..............................................................................................70
19.2.1 D.h.w. charging with hot water ......................................................................70
19.2.2 Alternate d.h.w. charging with hot water and electricity.................................70
19.3 D.h.w. temperature and d.h.w. switching differential.....................................71
19.4 Boost of the d.h.w. charging temperature......................................................72
19.5 Maximum d.h.w. charging time......................................................................72
19.6 Setpoint of legionella function........................................................................72
19.7 Forced charging.............................................................................................73
19.8 Protection against discharging ......................................................................73
19.8.1 Purpose.........................................................................................................73
19.8.2 Mode of operation..........................................................................................73
19.9 Manual d.h.w. charging .................................................................................74
20 Function block "3-position actuator for d.h.w.".......................................75

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20.1 Operating lines...............................................................................................75
20.2 Function.........................................................................................................75
20.2.1 Flow temperature boost.................................................................................75
20.2.2 D.h.w temperature control..............................................................................75
20.3 Pulse lock.......................................................................................................75
21 Function block "Derivative action time d.h.w. heating via heat exchanger"76
21.1 Operating line.................................................................................................76
21.2 Description.....................................................................................................76
22 Function block "Multi-functional relay"........................................................77
22.1 Operating lines...............................................................................................77
22.2 Functions .......................................................................................................77
22.2.1 No function.....................................................................................................77
22.2.2 Outside temperature switch...........................................................................77
22.2.3 ON / OFF according to the time switch..........................................................78
22.2.4 Relay energized in the event of fault..............................................................78
22.2.5 Relay energized during occupancy time........................................................78
22.2.6 Relay energized 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.............................79
23.2 Mode of operation..........................................................................................80
24 Function block "Switching program 3".......................................................81
24.1 Operating lines...............................................................................................81
24.2 Function.........................................................................................................81
25 Function block "Service functions and general settings".......................82
25.1 Operating lines...............................................................................................82
25.2 Display functions............................................................................................82
25.2.1 Flow temperature setpoint .............................................................................82
25.2.2 Heating curve.................................................................................................83
25.2.3 Hours run counter..........................................................................................83
25.2.4 Software version............................................................................................84
25.2.5 Identification number of room unit..................................................................84
25.3 Commissioning aids.......................................................................................84
25.3.1 Simulation of the outside temperature...........................................................84

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25.3.2 Relay test.......................................................................................................84
25.3.3 Sensor test ....................................................................................................85
25.3.4 Test of H–contacts.........................................................................................86
25.4 Auxiliary functions..........................................................................................86
25.4.1 Frost protection for the plant..........................................................................86
25.4.2 Flow alarm.....................................................................................................86
25.4.3 Manual overriding of operating mode (contact H1) .......................................87
25.4.4 Pump overrun................................................................................................87
25.4.5 Pump kick......................................................................................................88
25.4.6 Winter- / summertime changeover ................................................................88
25.4.7 Gain of locking signal ....................................................................................88
25.5 Entries for LPB ..............................................................................................89
25.5.1 Source of time of day.....................................................................................89
25.5.2 Outside temperature source..........................................................................90
25.5.3 Addressing the devices .................................................................................90
25.5.4 Bus power supply..........................................................................................91
25.5.5 Bus loading number.......................................................................................91
25.6 Heat demand output DC 0…10 V..................................................................91
26 Function block "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 limitation of charging temperature.................................................97
26.2.9 Storage tank temperature maximum limitation..............................................97
26.2.10 Collector start function gradient.....................................................................98
27 Function block "Locking functions"..........................................................99
27.1 Operating line................................................................................................99
27.2 Locking the settings on the software side......................................................99
27.3 Locking the settings for district heat on the hardware side............................99
28 Communication .........................................................................................100
28.1 Combination with room units.......................................................................100
28.1.1 General........................................................................................................100
28.1.2 Combination with room unit QAW50 ...........................................................100
28.1.3 Combination with room unit QAW70 ...........................................................101

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28.2 Combination with SYNERGYR central unit OZW30....................................103
28.3 Communication with other devices..............................................................103
29 Handling......................................................................................................104
29.1 Operation.....................................................................................................104
29.1.1 General........................................................................................................104
29.1.2 Analog operating elements..........................................................................105
29.1.3 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 diagrams...................................................................................110
31 Mechanical design.....................................................................................111
31.1 Basic design.................................................................................................111
31.2 Dimensions..................................................................................................111
32 Technical data............................................................................................112

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Building Technologies 1 Summary 20.05.2008
1 Summary
1.1 Brief description and key features
•The RVL481 is a multifunctional heating controller for use in residential and non-
residential 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
−Precontrol via demand-compensated control of the main / secondary flow
temperature
−Precontrol via demand-compensated boiler temperature control. Suited for integra-
tion into heat source cascades or heat generation systems (heat pump, solar,
wood)
•For use in plants with own heat generation or with a district heat connection
•With regard to d.h.w. heating, the RVL481 is suited for plants with d.h.w. storage tanks,
electric immersion heaters, solar d.h.w. heating and instantaneous systems with own
heat exchangers
•The RVL481 has 29 plant types preprogrammed. When a certain type of plant is se-
lected, all functions and settings required for that plant will be activated
•A scalable voltage 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 operating line principle
•The RVL481 is capable of communicating with other units via LPB (Local Process Bus)
•Key design features: Operating voltage AC 230 V, CE conformity, overall dimensions
to IEC 61554 (144 × 144 mm)
1.2 Equipment combinations
1.2.1 Suitable sensors
•For water temperatures:
Suitable are all types of temperature sensors that use a sensing element
LG-Ni 1000. The following types are presently available:
−Strap-on temperature sensor QAD22
−Immersion temperature sensors QAE212…
−Immersion temperature sensor QAP21.3 complete with connecting cable
−Immersion temperature sensor QAP21.2 complete with connecting cable, for solar
use
•For the room temperature:
Suitable are all types of temperature sensors that use a sensing element LG-Ni 1000:
−Room temperature sensor QAA24
•For the outside temperature:
−Outside sensor QAC22 (sensing element LG-Ni 1000)
−Outside sensor QAC32 (sensing element NTC 575)

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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 LPB-compatible controllers supplied by Siemens
•SYNERGYR central unit OZW30 (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
Installation Instructions, languages de, en, fr,
nl, sv, fi, da, it, es G2541 74 319 0618 0
CE Declaration of Conformity (all RVL types) T2540 –
Environmental Declaration E2541 –
Data Sheet QAW50 N1635 –
Data Sheet QAW70 N1637 –
Data Sheet LPB Basic System Data N2030 –
Data Sheet LPB Basic Engineering Data N2032 –
* unilingual, available in de, en, fr, nl, sv, fi, da, it, es
Note

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Building Technologies 2 Use 20.05.2008
2 Use
2.1 Types of plant
The RVL481 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 RVL481 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. heating with own heat generation
•Heating zones and d.h.w. heating with a district heat connection
•Interconnected plants consisting of heat generation, several heating zones and central
or decentral d.h.w. heating
2.2 Types of houses and buildings
Basically, the RVL481 is suited for use in all types of houses and buildings. It has been
designed especially for:
•Multi-family houses
•Single-family homes
•Nonresidential buildings
2.3 Types of heating systems
The RVL481 is suited for use with 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-stage burner
•D.h.w. storage tank charging through control of a mixing valve, charging pump or
changeover valve, with or without circulating pump
•D.h.w. heating via heat exchanger (instantaneous d.h.w. heating), with or without circu-
lating pump
•Optimum start / stop control according to the selected 7-day program
•Quick setback and boost heating according to the selected 7-day program
•ECO function: demand-dependent switching of the heating system based on the type
of building construction and the outside temperature
•Voltage output DC 0…10 V for passing on the heat demand signal
•Multifunctional relay
•7-day program for building occupancy with a maximum of 3 setback periods per day
and daily varying occupancy schedules
•Own 7-day switching program for the release of d.h.w. heating
•Third 7-day switching program

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•Input of 8 holiday periods per year
•Automatic summer- / wintertime changeover
•Display of parameters, actual values, operating state and error messages
•Communication with other units via LPB
•Remote operation via room unit and external 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. charging
For the preprogrammed heating and d.h.w. heating circuits and their possible combina-
tions, refer to section 3.2 ”Plant types”.

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Building Technologies 3 Fundamentals 20.05.2008
3 Fundamentals
3.1 Key technical features
The RVL481 offers 2 key technical features:
•The RVL481 has 6 heating circuit plant types and 5 d.h.w. plant types preprogrammed.
When making use of all possible or practical combinations, there is a total of 29 plant
types available
•All functions and their settings are combined in the form of function blocks
3.1.1 Plant types with regard to heating circuit
In terms of heating circuit, the following plant types are available:
•Heating circuit plant type 1 “Heating circuit control with mixing group”
•Heating circuit plant type 2 “Heating circuit control with boiler”
•Heating circuit plant type 3 “Heating circuit control with heat exchanger”
•Heating circuit plant type 4 “Precontrol with mixing group”
•Heating circuit plant type 5 “Precontrol with boiler”
•Heating circuit plant type 6 “Precontrol with heat exchanger”
Heating circuit plant type 5 is suited for integration into heat source cascades or 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. heating with electric immersion heater “
The d.h.w. plant types 1, 2, 3 and 5 can be supported by solar systems, i.e. they allow
for d.h.w. heating via solar collector.
3.1.3 Function blocks
The following function blocks are available:
•Function block “Enduser space heating”
•Function block “Enduser d.h.w.”
•Function block “Enduser general”
•Function block “Plant type”
•Function block “Cascade slave”
•Function block "Space heating"
•Function block “3-position actuator heating circuit”
•Function block “Boiler”
•Function block “Setpoint return temperature limitation”
•Function block “District heat”
•Function block "Maximum limitation of the return temperature d.h.w."
•Function block "Basic settings d.h.w."
•Function block "Release of d.h.w. heating"
•Function block "Priority and flow temperature setpoint d.h.w."
•Function block "D.h.w. storage tank"
•Function block "3-position actuator d.h.w."

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•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 “Solar d.h.w. heating“
•Function block “Locking functions”
For each function block, the required settings are available in the form of operating
lines. On the following pages, a description of the individual functions per block and line
is given.
3.2 Plant types
The RVL481 has 29 plant types preprogrammed; the functions required for each type of
plant are ready assigned. When commissioning the installation, the relevant plant type
must be selected.
Each plant type consists of a heating circuit and a d.h.w. circuit. When making use of all
possible or practical combinations, there is a total of 29 plant types 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 valve
2–5
Heating circuit control with
boiler
With electric immersion heater
3–0 No d.h.w.
3–1 Storage tank with charging pump
3–2 Storage tank with mixing group
3–3 Storage tank with changeover valve
3–4 Heat exchanger
3–5
Heating circuit control with
heat exchanger
With electric immersion heater
4–0 No d.h.w.
4–1 Storage tank with charging pump
4–2 Storage tank with mixing group
4–5
Precontrol with mixing
group With electric immersion heater
5–0 No d.h.w.
5–1 Storage tank with charging pump
5–2 Storage tank with mixing group
5–4 Heat exchanger
5–5
Precontrol with boiler
With electric immersion heater
6–0 No d.h.w.
6–1 Storage tank with charging pump
6–2 Storage tank with mixing group
6–5
Precontrol with heat ex-
changer With electric immersion heater

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Notes on the plant diagrams with the different types of space heating and d.h.w. circuits
are given in the following sections:
•Symbols and indicate where and how the space heating circuit is connected to
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 with which the
heating circuit can be combined
3.2.2 Heating circuit plant types
Heating circuit control with mixing group
Space heating with weather-compensated flow temperature control. 3-position control
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 with own boiler, with weather-compensated boiler temperature control.
2-position control acting on the burner.
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 3 via hydraulic connection at and
•with type 5 without hydraulic connection
A6/B5
2524S02
1, 2 3
Heating circuit
plant type 1
Heating circuit
plant type 2

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Heating circuit control with heat exchanger
Space heating with district heat connection, with weather-compensated flow tempera-
ture control acting on the valve in the primary return of the district heat connection.
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 2, 4 / type 1 / type 3 via hydraulic connection at and
•with type 5 without hydraulic connection
B7 B71
2521S03
A6/B5
Y1
N1
2, 4 13
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 boiler control
Precontrol with demand-compensated control of the boiler temperature. 2-position
control acting on the burner.
Heat demand signal from data bus. No 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
2541S05
B7
1, 2, 4
Heating circuit
plant type 3
Heating circuit
plant type 4
Heating circuit
plant type 5

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Precontrol with heat exchanger
Precontrol with district heat connection, with demand-compensated control of the sec-
ondary flow temperature acting on the valve in the primary return.
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
2541S06
B7 B71
Y1
N1
1, 2
3.2.3 D.h.w. plant types
Legend for sections 3.2.2 and 3.2.3:
A6 Room unit E2 Consumer (space)
B1 Flow / boiler sensor LPB Data bus
B3 D.h.w. flow sensor 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 Changeover valve
E1 Heat source (boiler / heat converter) Y7 D.h.w. mixing valve
No d.h.w. heating.
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 and solar
collector or electric immersion heater are optional.
M3
M4
2542S01
K6
N1
B31
B32
B6
M5
Heating circuit
plant type 6
D.h.w. plant type 0
D.h.w. plant type 1

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D.h.w. heating with mixing group
Charging of d.h.w. storage tank through control of the mixing valve according to own
temperature sensor in the storage tank flow. Acquisition of the d.h.w. temperature with
one or 2 sensors or thermostats. Circulating pump and solar collector or electric immer-
sion heater are optional.
2542S02
B3
Y7
M3 M4
K6
N1
B31
B32
B6
M5
D.h.w. heating with changeover valve
Charging of the d.h.w. storage tank through control of the changeover valve. Acquisi-
tion of the d.h.w. temperature 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 flow. Circulating pump is optional, but strongly
recommended.
M4
2524S10
B3
Y7
N1
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.
M4
2542S03
K6
N1
B6
M5
B31
B32
D.h.w. plant type 2
D.h.w. plant type 3
D.h.w. plant type 4
D.h.w. plant type 5