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Edition 1.0
Controller series A
CE1P2545en
15.03.2011
Building Technologies
RVP340
Heating controller for 1 heating circuit
RVP350 and RVP351
Heating controllers for 1 heating circuit and d.h.w.
Basic Documentation
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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 15.03.2011
Siemens Switzerland Ltd
Industry Sector
Building Technologies Division
Gubelstrasse 22
CH 6301 Zug
Tel. +41 41 724 24 24
www.siemens.com/sbt
© 2011 Siemens Switzerland Ltd
Subject to change
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Building Technologies Contents 15.03.2011
Contents
1 Summary..................................................................................................9
1.1 Brief description and key features.............................................................9
1.2 Type summary...........................................................................................9
1.3 Equipment combinations...........................................................................9
1.3.1 Suitable sensors........................................................................................9
1.3.2 Suitable room units .................................................................................10
1.3.3 Suitable actuators ...................................................................................10
1.3.4 Communication .......................................................................................10
1.3.5 Documentation ........................................................................................10
2 Use..........................................................................................................11
2.1 Types of plant.......................................................................................... 11
2.2 Types of houses and buildings................................................................ 11
2.3 Types of heating systems ....................................................................... 11
2.4 Heating circuit functions.......................................................................... 11
2.5 D.h.w. functions.......................................................................................12
3 Basics.....................................................................................................13
3.1 Key technical features.............................................................................13
3.2 Plant types ..............................................................................................13
3.2.1 Plant types with regard to heating circuit ................................................13
3.2.2 Plant types with regard to d.h.w. .............................................................14
3.2.3 Selectable combinations .........................................................................14
3.3 Setting levels, function blocks, and plant types ......................................15
3.4 Heating circuit operating modes .............................................................16
3.5 D.h.w. heating modes .............................................................................17
3.6 Manual control.........................................................................................17
3.7 Plant type and operating mode...............................................................18
3.8 Operating state and operating level........................................................18
4 Acquisition of measured values..........................................................19
4.1 Room temperature (A6, B5) ....................................................................19
4.1.1 Types of sensors .....................................................................................19
4.1.2 Error handling..........................................................................................19
4.1.3 Room model............................................................................................19
4.2 Flow temperature (B1) ............................................................................20
4.2.1 Types of sensors .....................................................................................20
4.2.2 Error handling..........................................................................................20
4.3 Boiler temperature (B2)...........................................................................20
4.3.1 Types of sensors .....................................................................................20
4.3.2 Error handling..........................................................................................20
4.4 Outside temperature (B9) .......................................................................20
4.4.1 Types of sensors .....................................................................................20
4.4.2 Error handling..........................................................................................20
4.5 Return temperature (B7) .........................................................................21
4.5.1 Types of sensors .....................................................................................21
4.5.2 Error handling..........................................................................................21
4.6 Storage tank temperature (B31, B32) .....................................................21
4.6.1 Types of sensors .....................................................................................21
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4.6.2 Error handling..........................................................................................21
4.7 Collector temperature (B6)......................................................................22
4.7.1 Type of sensor.........................................................................................22
4.7.2 Error handling..........................................................................................22
5 Function block: End-user space heating ....................................................23
5.1 Operating lines ........................................................................................23
5.2 Setpoints .................................................................................................23
5.2.1 General....................................................................................................23
5.2.2 Frost protection for the building...............................................................23
5.3 Heating program .....................................................................................24
5.4 Holiday program......................................................................................24
5.5 Heating curve ..........................................................................................24
6 Function block: End-user d.h.w...........................................................25
6.1 Operating lines ........................................................................................25
6.2 Setpoints .................................................................................................25
6.2.1 NORMAL d.h.w. temperature setpoint ....................................................25
6.2.2 REDUCED d.h.w. temperature setpoint..................................................25
6.3 Actual value.............................................................................................26
7 Function block: End-user general.......................................................27
7.1 Operating lines ........................................................................................27
7.2 Scheduler program 2...............................................................................27
7.3 Time of day and date...............................................................................27
7.4 Faults.......................................................................................................28
8 Function block: Plant configuration ...................................................29
8.1 Operating line..........................................................................................29
8.2 General....................................................................................................29
9 Function block: Space heating ............................................................30
9.1 Operating lines ........................................................................................30
9.2 Automatic ECO function..........................................................................30
9.2.1 Compensating and auxiliary variables ....................................................30
9.2.2 Heating limits...........................................................................................31
9.2.3 Mode of operation ...................................................................................31
9.3 Room temperature source ......................................................................32
9.4 Optimization ............................................................................................32
9.4.1 Definition and purpose ............................................................................32
9.4.2 Basics......................................................................................................33
9.4.3 Optimization with room sensor................................................................33
9.4.4 Optimization without room sensor...........................................................33
9.4.5 Process ...................................................................................................34
9.4.6 Room model temperature .......................................................................34
9.4.7 Optimized switching off ...........................................................................35
9.4.8 Quick setback..........................................................................................35
9.4.9 Optimized switching on ...........................................................................36
9.4.10 Boost heating ..........................................................................................36
9.5 Room functions .......................................................................................37
9.5.1 Maximum limitation of room temperature................................................37
9.5.2 Room influence .......................................................................................38
9.6 Heating curve ..........................................................................................38
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9.6.1 Purpose...................................................................................................38
9.6.2 Settings ...................................................................................................38
9.6.3 Deflection ................................................................................................39
9.6.4 Parallel displacement of heating curve ...................................................40
9.7 Generation of setpoint.............................................................................41
9.7.1 Weather-compensated control................................................................41
10 Function block: Actuator heating circuit ....................................................42
10.1 Operating lines........................................................................................42
10.2 Limitations ...............................................................................................42
10.2.1 Flow temperature limitations ...................................................................42
10.2.2 Setpoint increase ....................................................................................43
10.3 Type of actuator ......................................................................................43
10.3.1 2-position control.....................................................................................43
10.3.2 3-position control.....................................................................................44
10.4 Auxiliary variables in interconnected plants............................................44
10.4.1 Temperature boost mixing valve/heat exchanger ...................................44
10.5 Pulse lock with 3-position actuator .........................................................44
11 Function block: Boiler ..........................................................................45
11.1 Operating lines........................................................................................45
11.2 Operating mode ......................................................................................45
11.3 Limitations ...............................................................................................46
11.3.1 Maximum limitation of boiler temperature...............................................46
11.3.2 Minimum limitation of boiler temperature................................................46
11.3.3 Actions during d.h.w. heating ..................................................................46
11.4 2-position control.....................................................................................46
11.4.1 Control with 1-stage burner.....................................................................46
11.4.2 Control with 2-stage burner.....................................................................47
11.4.3 Frost protection for the boiler ..................................................................48
11.4.4 Protective boiler startup ..........................................................................49
11.4.5 Protection against boiler overtemperatures ............................................49
11.5 Operating mode of pump M1 ..................................................................50
12 Function block: Setpoint return temperature limitation ...................51
12.1 Operating line..........................................................................................51
12.2 Description ..............................................................................................51
12.3 Minimum limitation of return temperature ...............................................51
12.3.1 Type of sensor.........................................................................................51
12.3.2 Mode of operation ...................................................................................52
12.3.3 Mode of operation with an autonomous unit (without bus) .....................53
12.3.4 Mode of operation in interconnected plants............................................53
13 Function block: District heat ...............................................................54
13.1 Operating lines........................................................................................54
13.2 Limitations ...............................................................................................54
13.2.1 Maximum limitation of primary return temperature .................................54
14 Function block: D.h.w...........................................................................56
14.1 Operating lines........................................................................................56
14.2 Assignment of d.h.w. heating ..................................................................56
14.3 Program for the circulating pump............................................................56
14.4 Frost protection for d.h.w. .......................................................................56
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14.5 Release of d.h.w. heating........................................................................57
14.5.1 Function...................................................................................................57
14.5.2 Release programs...................................................................................57
14.5.3 D.h.w. heating during holiday periods .....................................................58
14.6 Priority and flow temperature setpoint ....................................................58
14.6.1 Settings ...................................................................................................58
14.6.2 D.h.w. priority...........................................................................................58
14.6.3 Absolute priority ......................................................................................59
14.6.4 Shifting priority.........................................................................................59
14.6.5 No priority................................................................................................59
14.6.6 Flow temperature setpoint.......................................................................60
14.6.7 Maximum selection .................................................................................60
14.6.8 D.h.w. ......................................................................................................60
14.7 Type of d.h.w. charging ...........................................................................60
14.8 D.h.w. storage tank sensor/thermostat....................................................60
14.9 Boost of d.h.w. charging temperature .....................................................62
14.10 Maximum d.h.w. charging time................................................................62
14.11 Setpoint for legionella function................................................................63
14.12 Forced charging ......................................................................................63
14.13 Protection against discharging ................................................................63
14.13.1 Purpose ...................................................................................................63
14.13.2 Mode of operation ...................................................................................63
14.14 Manual d.h.w. charging ...........................................................................64
15 Function block: Multifunctional relays.....................................................65
15.1 Operating lines ........................................................................................65
15.2 Functions of multifunctional relays K6/K7 ...............................................65
15.2.1 No function ..............................................................................................66
15.2.2 Relay energized in the event of fault.......................................................66
15.2.3 Relay energized when there is heat demand..........................................66
15.2.4 Circulating pump .....................................................................................66
15.2.5 Collector pump ........................................................................................67
15.2.6 Type of d.h.w. charging ...........................................................................67
16 Function block: Legionella function ...................................................69
16.1 Operating lines ........................................................................................69
16.1.1 Setpoint/switching on/off .........................................................................69
16.1.2 Periodicity of legionella function..............................................................69
16.1.3 Starting point ...........................................................................................69
16.1.4 Dwelling time at legionella setpoint.........................................................69
16.1.5 Operation of circulating pump .................................................................70
16.2 Mode of operation ...................................................................................70
17 Function block: Service functions and general settings ..................72
17.1 Operating lines ........................................................................................72
17.2 Display functions .....................................................................................72
17.2.1 Hours run counter ...................................................................................72
17.2.2 Software version......................................................................................72
17.3 Commissioning aids ................................................................................73
17.3.1 Simulation of outside temperature ..........................................................73
17.3.2 Relay test ................................................................................................73
17.3.3 Sensor test ..............................................................................................74
17.4 Auxiliary functions ...................................................................................75
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17.4.1 Frost protection for the plant ...................................................................75
17.4.2 Manual overriding of operating mode (contact H1).................................76
17.4.3 Pump overrun..........................................................................................76
17.4.4 Pump kick................................................................................................77
17.4.5 Winter-/summertime changeover............................................................77
17.4.6 Locking signal gain .................................................................................77
17.5 Inputs for LPB (RVP340 and RVP350) ...................................................79
17.5.1 Source of time of day ..............................................................................79
17.5.2 Outside temperature source ...................................................................80
17.5.3 Addressing the devices...........................................................................80
17.5.4 Bus power supply....................................................................................81
17.5.5 Bus loading number ................................................................................81
18 Function block: Solar d.h.w. ................................................................82
18.1 Operating lines........................................................................................82
18.2 General ...................................................................................................82
18.3 Functions.................................................................................................83
18.3.1 Temperature differential ON/OFF solar...................................................83
18.3.2 Minimum charging temperature ..............................................................83
18.3.3 Minimum running time.............................................................................84
18.3.4 Fost protection temperature for the collector ..........................................84
18.3.5 Overtemperature protection for the collector ..........................................85
18.3.6 Storage tank recooling ............................................................................86
18.3.7 Evaporation temperature of heat conducting medium............................87
18.3.8 Maximum limitation of charging temperature..........................................87
18.3.9 Maximum limitation of storage tank temperature....................................88
18.3.10 Collector start function ............................................................................88
19 Function block: Locking functions .....................................................89
19.1 Operating line..........................................................................................89
19.2 Locking settings on the software side .....................................................89
20 Communication.....................................................................................90
20.1 Interplay with room units .........................................................................90
20.1.1 General ...................................................................................................90
20.1.2 Interplay with room unit QAW50 .............................................................90
20.1.3 Interplay with room unit QAW70 .............................................................91
20.1.4 Interplay with SYNERGYR central unit OZW30 .....................................93
20.2 Communication with other devices .........................................................93
21 Handling.................................................................................................94
21.1 Operation ................................................................................................94
21.1.1 General ...................................................................................................94
21.1.2 Operating elements.................................................................................95
21.1.3 Setting levels and access rights..............................................................97
21.2 Commissioning........................................................................................98
21.2.1 Installation Instructions ...........................................................................98
21.2.2 Operating lines........................................................................................98
21.3 Installation ...............................................................................................99
21.3.1 Mounting location....................................................................................99
21.3.2 Mounting choices ....................................................................................99
21.3.3 Electrical installation................................................................................99
22 Engineering .........................................................................................100
22.1 Connection terminals ............................................................................100
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22.2 Connection diagrams ............................................................................101
22.2.1 Low-voltage side ...................................................................................101
22.2.2 Mains voltage side ................................................................................101
23 Mechanical design ..............................................................................103
23.1 Basic design ..........................................................................................103
23.2 Dimensions............................................................................................103
24 Addendum............................................................................................104
24.1 Technical data .......................................................................................104
24.2 Revision history.....................................................................................104
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1 Summary
1.1 Brief description and key features
RVP340, RVP350 and RVP351 are multifunctional heating controllers for use in
residential and nonresidential buildings
They are suited for weather-compensated flow temperature control of 1 heating
zone with or without room temperature influence and for demand-dependent
boiler temperature control (RVP350 and RVP351
)
The controllers are used in plants with own heat generation (RVP350 and
RVP351) or district heat connection (RVP340)
On the d.h.w. side, the RVP350 and RVP351 controllers cover plants with stor-
age tank charging via the heating system, with electric immersion heater, and
with solar collectors
The RVP340 controller is supplied with 2 programmed plant types, the RVP350
and RVP351 with 3. When a certain type of plant is selected, all functions and
settings required for the particular plant will be activated
Multifunctional relays provide additional control functions, if required
Heating curve adjustment is digital. Readjustments of the room temperature are
made with a knob
All other parameter settings are made based on the operating line principle.
The RVP340 and RVP350 controllers are capable of communicating with other
LPB-compatible devices in the system via LPB (Local Process Bus).
The RVP351 is a noncommunicating controller
Key design features: Operating voltage AC 230 V, CE conformity, overall
dimensions to IEC 61554 (144 x 96 mm)
1.2 Type summary
All types are compact controllers and require no plug-in modules. The controllers
are supplied complete with base.
Product no. Description
RVP340 Heating controller, communicating
RVP350 Heating controller for 1 heating circuit and d.h.w. heating with solar
support, communicating
RVP351 Heating controller for 1 heating circuit and d.h.w. heating with solar
support, noncommunicating
1.3 Equipment combinations
1.3.1 Suitable sensors
For water temperatures:
Suitable are sensors operating with a sensing element LG-Ni1000:
Strapon sensor QAD22
Immersion sensors QAE22..
Immersion sensor QAP21.3 complete with connecting cable
Immersion sensor QAP21.2 complete with connecting cable (solar)
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For the room temperature:
Suitable are sensors operating with a sensing element LG-Ni1000:
Room sensor QAA24
For the outside temperature:
Outside sensor QAC22 (sensing element LG-Ni1000)
Outside sensor QAC32 (sensing element NTC 575)
The controllers identify automatically the type of sensor used.
1.3.2 Suitable room units
Room unit QAW50
Room unit QAW70
1.3.3 Suitable actuators
The following types of actuators from Siemens can be used:
Electromotoric or electrohydraulic 3-position actuators with a running time of
30...873 seconds
2-position actuators
Operating voltage AC 24...230 V
1.3.4 Communication
The RVP340 and RVP350 controllers are capable of communicating with …
all types of LPB-compatible controllers supplied by Siemens,
the SYNERGYR central unit OZW30 (software version 3.0 or higher).
The RVP351 controller cannot communicate via LPB.
1.3.5 Documentation
Type of document Document no. Stock no.
Data Sheet RVP340, RVP350, RVP351 N2545 STEP Web Client
Installation Instructions RVP340,
RVP350, RVP351 (de, en, fr, it, nl, es,
el, and ru)
G2545 74 319 0815 0
Operating Instructions RVP340,
RVP350, RVP351 (de, en, fr, it, nl, es,
el, and ru)
B2545 74 319 0816 0
CE Declaration of Conformity T2545 STEP Web Client
Environmental Declaration E2545 STEP Web Client
LPB Basic System Data N2030 STEP Web Client
LPB Basic Engineering Data N2032 STEP Web Client
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2 Use
2.1 Types of plant
The RVP3.. controllers are suitable for all types of heating plant that use weather-
compensated flow temperature control.
With regard to d.h.w. heating, the controllers are suited for plants with storage tank
charging.
Main applications:
Heating zones and d.h.w. heating with own heat generation
Heating zones with 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 RVP3... controllers are suited for use in all types of houses and build-
ings. But they have been designed specifically for …
multifamily houses,
single-family houses,
small to medium-size nonresidential buildings.
2.3 Types of heating systems
The RVP3... controllers are used in connection with all standard heating systems,
such as …
radiators,
convectors,
floor heating systems,
ceiling heating systems,
radiant panels.
2.4 Heating circuit functions
The RVP3... controllers are used if one or several of the following functions is/are
required:
Weather-compensated flow temperature control
Flow temperature control via a modulating valve (3- or 2-position actuator)
Weather-compensated flow temperature control and simultaneous demand-
dependent control of the boiler temperature
Optimization of switching on/off times according to the 7-day program entered
Quick setback and boost heating according to the 7-day program entered
Automatic ECO function: Demand-dependent switching of the heating system
depending on the type of building structure and the outside temperature
Multifunctional relays
7-day program for building occupancy with a maximum of 3 setback periods per
day and daily varying occupancy schedules
Input of 1 holiday period per year
Automatic summer-/wintertime changeover
Display of parameters, actual values, operating states and error messages
Communication with other devices via LPB (only RVP340 and RVP350)
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Remote control via room unit and external contacts
Service functions
Frost protection for plant, the boiler and the house or building
Minimum or maximum limitation of return temperature
Minimum and maximum limitation of flow temperature
Maximum limitation of room temperature
Periodic pump run
Pump overrun
Maximum limitation of the rate of setpoint increase
For the programmed heating and d.h.w. circuits and their possible combinations,
refer to chapter 3.2 "Plant types".
2.5 D.h.w. functions
The RVP35.. controllers are used if one or several of the following d.h.w. functions
is/are required:
D.h.w. storage tank charging through control of a charging pump, with or without
circulating pump
D.h.w. storage tank charging via solar collectors
D.h.w. storage tank charging via electric immersion heater
Own 7-day scheduler program for the release of d.h.w. charging
Legionella function
Selectable priority for d.h.w. heating: Absolute, shifting or parallel
Manual d.h.w. charging
Forced d.h.w. charging
Frost protection for d.h.w.
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3 Basics
3.1 Key technical features
The RVP3... line of heating controllers offer the following key technical features:
The RVP340 controller is supplied with 2 programmed plant types, the RVP350
and RVP351 with 3. Illustrations of the different plant types are contained in
chapter 3.2 "Plant types"
The different functions are assigned to the setting levels "End-user", "Heating
engineer" and "Locking level". The functions are grouped in the form of function
blocks
The settings are made via operating lines (see chapter 5 ff.)
Setting level Function block
Space heating
D.h.w.
End-user
General
Plant configuration
Space heating
Actuator heating circuit
Boiler
Return temperature limitation
District heat
D.h.w.
Multifunctional relays
Legionella function
Service functions and general settings
Heating engineer
Solar d.h.w.
Locking level Locking functions
3.2 Plant types
When commissioning a plant, the respective plant type must be entered. The
required functions, settings and displays are then automatically assigned, and
parameters that are not required will be hidden.
Plant types are usually made up of a heating circuit and a d.h.w. circuit.
Optional functions necessitate extra configurations.
3.2.1 Plant types with regard to heating circuit
In terms of heating circuit, the following plant types are available:
Heating circuit plant type 1: Space heating with mixing valve
Heating circuit plant type 2: Space heating with district heat
Heating circuit plant type 3: Space heating with mixing valve and
precontrol with boiler
Note
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3.2.2 Plant types with regard to d.h.w.
In terms of d.h.w., the following plant types are available:
D.h.w. plant type 0: No d.h.w.
D.h.w. plant type 1: Storage tank with charging pump
With d.h.w. plant type 1 (storage tank with charging pump), either the electric
immersion heater or the solar collectors can be activated for d.h.w. charging.
3.2.3 Selectable combinations
Type Type of heating circuit Type of d.h.w. heating RVP340 RVP350 RVP351*
1–0
Space heating with mix-
ing valve
No d.h.w.
1–1
Space heating with mix-
ing valve
Storage tank with charg-
ing pump
2–0
Space heating with dis-
trict heat
No d.h.w.
3–0
Space heating with mix-
ing valve and precontrol
with boiler
No d.h.w.
3–1
Space heating with mix-
ing valve and precontrol
with boiler
Storage tank with charg-
ing pump
* In terms of functions, RVP350 and 351 are identical. The only difference is that RVP351 has no
communication capability via LPB
RVP340:
Plant types 1 - 0 and 2 - 0
RVP350 and RVP351
Plant types 1 - x
Note
Plant types
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Plant types 3 - x
Components shown in broken lines are optional.
A6 Room unit Kx K6, K7 = multifunctional outputs
B1 Flow sensor K4 Burner stage 1
B2 Boiler sensor K5 Burner stage 2
B31 D.h.w. storage tank sensor/thermostat K6 Circulating pump
B32 D.h.w. storage tank sensor/thermostat M1 Circulating pump
B5 Room sensor M2 Heating circuit pump
B6 Collector sensor M3 Storage tank charging pump
B7 Return sensor N1 Controller RVP3..
B9 Outside sensor Y1 Actuator heating circuit
3.3 Setting levels, function blocks, and plant
types
Op. level Function block
Plant type
1-0 1-1 2-0 3-0 3-1
End-user space heating
End-user d.h.w.
End-user
End-user general
Plant configuration
Space heating
Actuator heating circuit
Boiler
Limitation of return temperature
District heat
D.h.w.
Multifunctional relays
Legionella function
Service functions and general settings
Heating
engineer
Solar d.h.w.
Locking level Locking functions
The above table shows …
which function blocks are assigned to the 3 operating levels,
which function blocks are activated with the different plant types.
Key to plant components
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3.4 Heating circuit operating modes
The required operating mode is selected on the controller by pressing the respec-
tive button. The operating mode can also be changed by bridging terminals H1-M.
Automatic operation
Automatic switching over from NORMAL to REDUCED temperature,
and vice versa, according to the 7-day program entered
Automatic switching over to holiday mode, and back, according to the
holiday schedule entered
Demand-dependent switching of the heating system according to the
progression of room and outside temperature while giving considera-
tion to the building's thermal inertia (automatic ECO function)
Optional remote control via room unit
Frost protection is ensured
Reduced operation
Continuous heating to the REDUCED temperature
With automatic ECO function
No holiday mode
Remote control via room unit not possible
Frost protection is ensured
Normal operation
Continuous heating to NORMAL temperature
No automatic ECO function
No holiday mode
Remote control via room unit not possible
Frost protection is ensured
Protection mode
Heating is off, but is ready to operate
Frost protection is ensured
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3.5 D.h.w. heating modes
D.h.w. heating is switched on and off by pressing the respective button:
ON (button
is lit): D.h.w. heating takes place independent of the
heating circuit’s operating mode and control. D.h.w. can be heated in
one of 3 different ways:
According to the scheduler program 2 entered
According to the heating circuit program entered (–1 hour)
Continuously (24 hours a day)
During the holiday period entered, d.h.w. heating and the circulating
pump are deactivated when using controllers without bus connection
(RVP351) (with data bus, depending on the setting made).
OFF (button
dark): No d.h.w. heating. Frost protection is ensured
Solar d.h.w. heating is always released, independent of the d.h.w.
heating mode
3.6 Manual control
RVP3.. controllers can be switched to manual control. In that case,
automatic control is deactivated.
During manual control, the various actuating devices behave as follows:
Heating circuit mixing valve/2-port valve: Dead, but valve can be con-
trolled manually with the buttons for manual control
( and ):
3-position actuators: Can be driven to any position by pressing
(close) and
(open).
2-position actuators: Power supply to the actuator can be switched on
by pressing
and off by pressing
Heating circuit pump M2 runs continuously
Boiler: The 2 burner stages are continuously on. Circulating pump M1
runs continuously
Storage tank charging pump M3: Runs continuously
Collector pump: Runs continuously
Circulating pump K6: Runs continuously
Electric immersion heater: Continuously released
Manual control also negates any overriding of the controller's operating
mode (bridging of H1–M).
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3.7 Plant type and operating mode
The following operating modes are available, depending on the selected type of
plant:
Plant type
1–0, 2–0, 3–0 Yes Yes Yes Yes No Yes
1–1, 3–1
Yes Yes Yes Yes Yes Yes
3.8 Operating state and operating level
The user selects the required 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 1 operating state).
When the automatic ECO function is active and with quick setback, the operating
state is always OFF.
When the operating state is ON, there is a maximum of 3 operating levels, depend-
ing on the operating mode. The operating level is determined by the heating pro-
gram and the holiday program.
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4 Acquisition of measured values
4.1 Room temperature (A6, B5)
4.1.1 Types of sensors
The following choices are available:
A room sensor QAA24 can be connected to terminal B5. The measuring range is
0…50 °C
A room unit QAW50 or QAW70 can be connected to the PPS (point-to-point in-
terface), terminal A6. The measuring range is 0…32 °C.
One unit can be connected to each of the 2 terminals; in that case, the controller
can ascertain the mean value of the 2 measurements, depending on the setting
made. Averaging has no impact on the other room unit functions
4.1.2 Error handling
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the control responds as follows, depending on the room temperature source (set-
ting on operating line 65):
No sensor (operating line 65 = 0):
A short-circuit or an interruption has no impact on the control. An error message
is not delivered
Room unit connected to terminal A6 (operating line 65 = 1):
In the event of a short-circuit or an interruption, the control continues to operate
with the room model, depending on the function. An error message is delivered
Room sensor connected to terminal B5 (operating line 65 = 2):
In the event of a short-circuit or an interruption, the control continues to operate
with the room model, depending on the function. An error message is delivered
Mean value of A6 and B5 (operating line 65 = 3):
In the event of a short-circuit or an interruption of one of the 2 measuring
circuits, the control continues to operate with the correctly working measuring
circuit. An error message is delivered.
In the event of a short-circuit or an interruption of both measuring circuits, the
control continues to operate with the room model, depending on the function.
2 error messages are delivered
Automatic selection (operating line 65 = 4):
Since the controller itself decides how it acquires the room temperature, no error
messages can be delivered
4.1.3 Room model
The controller features a room model. It simulates the progression of the room
temperature. In plants with no acquisition of the room temperature, the room model
can provide certain room functions (e.g. quick setback).
For more detailed information, refer to chapter 9.4.6 "Room model temperature".
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4.2 Flow temperature (B1)
4.2.1 Types of sensors
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
Averaging with 2 sensors is not possible.
4.2.2 Error handling
A flow sensor with a short-circuit or an interruption always leads to a corresponding
error message, irrespective of the type of plant. If that case, the heating circuit
pump is activated and the mixing valve on the primary side is driven to the fully
closed position when using a mixing circuit, and the heating circuit pump is deacti-
vated when using a pump circuit.
If there is a short-circuit or an interruption and the flow temperature is queried, the
display of the QAW70 room unit shows ---.
4.3 Boiler temperature (B2)
4.3.1 Types of sensors
The boiler temperature is required in connection with plant type 3 - x.
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
4.3.2 Error handling
In the event of a short-circuit or an interruption of the measuring circuit, an error is
displayed. The plant responds as follows:
The burner shuts down
Pump M1 runs continuously
4.4 Outside temperature (B9)
4.4.1 Types of sensors
The following types of sensors can be used:
Outside sensor QAC22 (sensing element LG-Ni1000)
Outside sensor QAC32 (sensing element NTC 575)
The controller identifies automatically the type of sensor used. The measuring
range is –50…50 °C.
The outside temperature can also be acquired via LPB; refer to chapter 17.5.2
"Outside temperature source".
4.4.2 Error handling
In the event of a short-circuit or an interruption of the measuring circuit, the control-
ler responds as follows, depending on the outside temperature source:
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Controller not connected to data bus (LPB):
The control operates with a fixed outside temperature of 0 °C. An error message
is delivered
Controller connected to data bus (LPB):
If the outside temperature is available via data bus, it is used. An error message
is not delivered (this is the normal status in interconnected plants!). But if no out-
side temperature is available via data bus, the control uses a fixed outside tem-
perature of 0 °C. In that case, an error message is delivered
4.5 Return temperature (B7)
4.5.1 Types of sensors
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
This measured value is required for minimum and maximum limitation of the return
temperature.
In interconnected plants (RVP340 or RVP350), the return temperature with plant
type 1 - x can be acquired via data bus. Controllers with plant type 1 - x and con-
nected sensor forward the return temperature via data bus.
4.5.2 Error handling
If, in the event of a short-circuit or an interruption of the measuring circuit, the con-
troller requires the return temperature, it responds as follows:
If a return temperature from a controller in the same segment is available via
data bus, it is used (only with plant type 1- x). No error message is delivered
since this is the normal status in interconnected plants
If a return temperature signal is not available via data bus, the return tempera-
ture limitation functions are deactivated and an error message is delivered
4.6 Storage tank temperature (B31, B32)
4.6.1 Types of sensors
The storage tank temperature can be acquired as follows:
With 1 or 2 sensors operating with a sensing element LG-Ni1000, or
With 1 or 2 thermostats
Solar d.h.w. heating must always be effected with 1 or 2 sensors.
4.6.2 Error handling
The controller's response to errors in the measuring circuit depends on the setting
made on operating line 126 (d.h.w. storage tank sensor/thermostat).
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the controller continues to operate with the other measuring circuit, if possible. An
error message is not delivered.
If both measuring circuits do not produce a valid measured value, an error mes-
sage is delivered. D.h.w. is no longer heated; the charging pump will be deacti-
vated.
1 storage tank sensor
(operating line 126 = 0)
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In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the controller continues to operate with the other measuring circuit. An error mes-
sage is delivered.
If both measuring circuits do not produce a valid measured value, 2 error mes-
sages are delivered. D.h.w. is no longer heated; the charging pump will be deacti-
vated.
If there is neither an interruption (thermostat open) nor a short-circuit (thermostat
closed) in measuring circuit B31, an error message is delivered. D.h.w. is no longer
heated; the charging pump will be deactivated.
If there is neither an interruption (thermostat open) nor a short-circuit (thermostat
closed) in one of the measuring circuits, an error message is delivered. The con-
troller continues to operate with the correctly working measuring circuit.
If there is neither an interruption (thermostat open) nor a short-circuit (thermostat
closed) in both measuring circuits, 2 error messages are delivered. D.h.w. is no
longer heated; the charging pump will be deactivated.
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the controller continues to operate with the other measuring circuit, if possible. An
error message is not delivered.
If both measuring circuits do not produce a valid measured value, an error mes-
sage is delivered. D.h.w. is no longer heated; the charging pump and the collector
pump will be deactivated.
In the event of a short-circuit or an interruption of one of the 2 measuring circuits,
the controller continues to operate with the other measuring circuit. An error mes-
sage is delivered.
If both measuring circuits do not produce a valid measured value, 2 error mes-
sages are delivered. D.h.w. is no longer heated; the charging pump and the collec-
tor pump will be deactivated.
If a measured value of the d.h.w. temperature is not available and the temperature
is queried, the QAW70 room unit displays ---.
4.7 Collector temperature (B6)
4.7.1 Type of sensor
The collector temperature is acquired by a Siemens sensor operating with a sens-
ing element LG-Ni1000 and an extended measuring range.
4.7.2 Error handling
In the event of an interruption of the measuring circuit, an error message is deliv-
ered with a delay of 12 hours and the collector pump is deactivated. This means
that solar d.h.w. heating is no longer provided.
2 storage tank sensors
(operating line 126 = 1)
1 storage tank thermostat
(operating line 126 = 2)
2 storage tank thermo-
stats (operating line
126 = 3)
1 storage tank sensor for
solar d.h.w. heating
(operating line 126 = 4)
2 storage tank sensors
for solar d.h.w. heating
(operating line 126 = 5)
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6.3 Actual value
Operating line 27 displays the current d.h.w. temperature. When using 2 d.h.w.
sensors (B31 and B32), the temperature of the ”warmer” sensor is displayed.
When using thermostats, the actual value of the d.h.w. temperature cannot be dis-
played. In that case, the display shows ---.
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7 Function block: End-user general
This function block provides settings that the end-user himself can make, plus
indication of faults.
7.1 Operating lines
Line Function, parameter Factory setting (range) Unit
31 Weekday, for entering scheduler program 2 1-7 (1...7, 1-7)
32 Start of 1st ON phase 05:00 (--:-- / 00:00...24:00) hh:mm
33 End of 1st ON phase 22:00 (--:-- / 00:00...24:00) hh:mm
34 Start of 2nd ON phase --:-- (--:-- / 00:00...24:00) hh:mm
35 End of 2nd ON phase --:-- (--:-- / 00:00...24:00) hh:mm
36 Start of 3rd ON phase --:-- (--:-- / 00:00...24:00) hh:mm
37 End of 3rd ON phase --:-- (--:-- / 00:00...24:00) hh:mm
38 Time of day (00:00...23:59) hh:mm
39 Weekday Display function
40 Date (01.01. ... 31.12.) dd:mm
41 Year (2009...2099) yyyy
50 Faults Display function
7.2 Scheduler program 2
Scheduler program 2 can be used for one or several of the following functions:
As a scheduler program for the circulating pump
As a scheduler program for the release of d.h.w. heating
Scheduler program 2 of the controller allows up to 3 ON phases per day; also,
every weekday can have different ON phases.
As with the heating program, it is not the switching times that are to be entered, but
the periods of time during which the program or the controlled function shall be
active.
Using setting "1-7" on operating line 31, a scheduler program that applies to all
weekdays can be entered. This simplifies the settings. If weekend times differ, first
enter the times for the entire week, then change days 6 and 7 as required.
The entries are sorted and overlapping ON phases are combined.
7.3 Time of day and date
The RVP3.. controllers have a yearly clock for entering the time of day, the week-
day and the date.
The weekday on operating line 39 is automatically determined according to the set
date and cannot be changed.
The change from summertime to wintertime, and vice versa, is made automatically.
Should the respective regulations change, the changeover dates can be adjusted
(refer to chapter 17 "Function block: Service functions and general settings").
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7.4 Faults
The following faults are displayed:
Number Error
10 Fault outside sensor B9
20
Fault boiler sensor B2
30
Fault flow sensor B1
40
Fault primary return sensor B7
50
Fault storage tank sensor/thermostat B31
52
Fault storage tank sensor/thermostat B32
60
Fault room sensor B5
61
Fault room unit A6
62
Device with wrong PPS identification connected
73
Fault collector sensor B6
81*
Short-circuit on data bus (LPB)
82*
2 devices with the same bus address (LPB)
86
Short-circuit PPS
100*
2 clock masters on the data bus (LPB)
140*
Inadmissible bus address (LPB)
* These fault displays are only possible with RVP340 and RVP350
If a fault occurs, the LCD displays Er.
In interconnected plants, the address (device and segment number) of the control-
ler causing the fault is displayed on all the other controllers. But no address ap-
pears on the controller that caused the fault.
Example of display in interconnected plants:
50
20
06
02
= operating line
= error number
= segment number (LPB)
= device number (LPB)
The error message disappears only after the fault has been rectified. There is no
acknowledgement!
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8 Function block: Plant configuration
This function block only provides selection of the plant type:
8.1 Operating line
Line Function, parameter Factory setting (range)
51 Plant type RVP340 10 (1–0, 2–0)
RVP35.. 3–1 (1–1, 3–0, 3–1)
8.2 General
When commissioning a plant, the respective plant type must be entered first on the
RVP340 or RVP35.. This ensures that the functions required for the specific type of
plant, the parameters and operating lines for the settings and displays are acti-
vated.
All plant-specific variables and operating lines for use with the other plant types will
be hidden. They will not appear on the display.
Example of entry:
3
0
= heating circuit type 3
= d.h.w. type 0
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9 Function block: Space heating
This function block performs the automatic ECO function, the optimization
functions with boost heating and quick setback, plus room influence.
9.1 Operating lines
Line Function, parameter Factory setting (range) Unit
61 NORMAL heating limit (ECO day) 17.0 (--.- / 5...25) °C
62 REDUCED heating limit (ECO night) 5.0 (--.- / –5...25) °C
63 Building time constant 20 (0...50) h
64 Quick setback 1 (0 / 1)
65 Room temperature source A (0…3 / A)
66 Type of optimization 0 (0 / 1)
67 Maximum heating up period 00:00 (00:00...42:00) h
68 Maximum early shutdown 0:00 (0:00...6:00) h
69 Maximum limitation room temperature --.-- (--.- / 0...35) °C
70 Influence of room temperature (gain factor) 4 (0...20)
71 Boost of room temperature setpoint on boost heating 5 (0...20) °C
9.2 Automatic ECO function
The automatic ECO function controls space heating depending on demand. It gives
consideration to the progression of the room temperature depending on the type of
building structure as the outside temperature varies. If the amount of heat stored in
the house or building is sufficient to maintain the room temperature setpoint cur-
rently required, the heating is switched off.
The automatic ECO function ensures that the heating system operates only, or
uses energy only, when indeed required.
9.2.1 Compensating and auxiliary variables
The compensating and auxiliary variables considered by the automatic ECO func-
tion are the progression of the outside temperature and the heat storage capacity
of the building.
The following variables are taken into account:
The building time constant: This is a measure of the type of building structure
and indicates how quickly the room temperature would vary if the outside tem-
perature suddenly changed. The following guide values can be used for setting
the building time constant: 10 hours for light, 25 hours for medium, and 50 hours
for heavy building structures
The current outside temperature (T
A
)
The composite outside temperature (T
AM
). It is the mean value of …
the current outside temperature,
the outside temperature filtered by the building time constant
Compared with the current outside temperature, the composite outside tempera-
ture is attenuated. Hence, it represents the impact of short-time outside tempera-
ture variations on the room temperature as they often occur during intermediate
seasons (spring and autumn).
The attenuated outside temperature (T
AD
): It is generated by double-filtering the
current outside temperature by the building time constant. This means that – in
comparison with the current outside temperature – the attenuated outside tem-
perature is considerably dampened. This ensures that no heating is provided in
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the summer when – because the outside temperature drops for a few days – the
heating would normally be switched on
T
A
(B9 rsp. BUS)
2522B02
T
A
k
t
k
t
T
AD
T
AM
Generation of composite and attenuated outside temperature
T
A
Current outside temperature T
AM
Composite outside temperature
T
AD
Attenuated outside temperature k
t
Building time constant
0
5
10
15
20
25
T
AD
T
AM
t
2522D17
T
A
T
A
Progression of current, composite and attenuated outside temperature
T
A
Current outside temperature T
AM
Composite outside temperature
T
AD
Attenuated outside temperature t Time
9.2.2 Heating limits
2 heating limits can be set:
"ECO day" for NORMAL heating
"ECO night" for the lower temperature level. This can be REDUCED heating or
OFF (holiday/protection mode)
In both cases, the heating limit is the outside temperature at which the heating shall
be switched on or off. The switching differential is 1 °C.
9.2.3 Mode of operation
The heating is switched off when one of the 3 following conditions is satisfied:
The current outside temperature exceeds the current ECO heating limit
The composite outside temperature exceeds the current ECO heating limit
The attenuated outside temperature exceeds the "ECO day" heating limit
In all these cases, the assumption is made that the amount of heat entering the
building from outside, or the amount of heat stored in the building structure, is suffi-
cient to maintain the required room temperature level.
When the automatic ECO function switches the heating off, the display shows
ECO.
Switching the
heating off
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9.4.2 Basics
It is possible to select or set …
the type of optimization; either with a room sensor/room unit or according to the
room model,
the maximum heating up time,
maximum early shutdown,
quick setback (yes or no).
For optimization, the controller considers either the current room temperature –
acquired by a room sensor or room unit – or the room model.
9.4.3 Optimization with room sensor
When using a room sensor/room unit, it is possible to have both optimized switch-
ing on and optimized switching off.
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
constantly acquires the room temperature and the prevailing outside temperature.
It captures these variables via the room sensor and the outside sensor and con-
tinually adjusts the forward shift of the switching points. This way, optimization can
also detect changes made to the house or building and take them into considera-
tion.
The learning process always concentrates on the first heating phase per day.
9.4.4 Optimization without room sensor
Without room sensor, only optimized switching on is possible.
Optimization operates with fixed values (no learning process), based on the set
maximum heating up time and the room model.
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9.4.5 Process
HP
T
Rw
T
Rx
T
Rw
T
Rw
T
Rw
HP Heating program
T
R
Room temperature
t Zeit
t
1
Forward shift for early shutdown
t
2
Forward shift to start heating up
t
3
Quick setback
T
Rw
Room temperature setpoint
T
Rw
Setpoint for NORMAL room temperature
T
Rw
Setpoint for REDUCED room temperature
T
Rw
Boost of room temperature setpoint (with boost heating)
T
Rx
Actual value of room temperature
9.4.6 Room model temperature
To determine the room temperature generated by the room model, a distinction
must be made between 2 cases:
The controller is not in quick setback mode:
The room temperature according to the room model is identical to the current
room temperature setpoint
The controller is in quick setback mode:
The room temperature used by the room model is calculated according to the
following formula:
Room model temperature T
RM
[°C] = (T
Rw
– T
AM
) × e
3 × kt
t
+ T
AM
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2522D18
t
1
T
Rw
T
RM
T
Rw
T
Rw
Progression of room temperature generated by the room model
e 2.71828 (basis of natural logarithms) T
R
Room temperature
k
t
Building time constant in hours T
RM
Room model temperature
t Time in hours
T
Rw
Setpoint for NORMAL room temperature
t
1
Quick setback
T
Rw
Setpoint for REDUCED room temperature
T
AM
Composite outside temperature
9.4.7 Optimized switching off
During the building's occupancy time, the controller maintains the setpoint for
NORMAL heating. Toward the end of the occupancy time, the control system
switches to the setpoint for REDUCED heating. Optimization calculates the switch-
over point such that, when occupancy ends, the room temperature will lie 0.5 °C
below the setpoint for NORMAL heating (early shutdown).
Optimized switching off can be deactivated by entering 0 hours for maximum early
shutdown.
9.4.8 Quick setback
When changing from the NORMAL temperature to a lower temperature level
(REDUCED or holidays/frost), the heating is shut down. It remains shut down until
the setpoint for the lower temperature level is reached.
With room sensor, the actual value of the room temperature is taken into
account
Without room sensor, the actual value is simulated by the room model.
The duration of quick setback is then calculated according to the following
formula:
T
Rw
- T
AM
t [ h ] = 3
*
k
t
*
(- ln ———————— )
T
Rw
- T
AM
where:
ln Natural logarithm
k
t
Building time constant in hours
t Duration of quick setback
T
AM
Composite outside temperature
T
Rw
Setpoint for NORMAL room temperature
T
Rw
Setpoint for REDUCED room temperature
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9.4.9 Optimized switching on
During nonoccupancy times, the controller maintains the setpoint for REDUCED
heating. Toward the end of the nonoccupancy time, optimization switches the con-
trol to boost heating; this means that the set boost is added to the room tempera-
ture setpoint. Optimization calculates the switchover point such that, when occu-
pancy starts, the room temperature will have reached the setpoint for NORMAL
heating.
When the room temperature is simulated by the room model – that is, without room
sensor – the forward shift is calculated as follows:
t [ min ] = ( T
Rw
- T
RM
)
*
k
t
*
3
where:
t
Forward shift
T
Rw
Setpoint for NORMAL room temperature
T
RM
Room model temperature
k
t
Building time constant in hours
Optimized switching on with the room model is effected only if, previously, quick
setback took place.
Optimized switching on can be deactivated by entering 0 hours for the maximum
heating up time.
9.4.10 Boost heating
For boost heating, a room temperature setpoint boost can be set.
After switching over 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.
t
2522D08
T
R
T
Rw
T
Rx
T
Rw
T
Rw
T
Rw
t Time
T
R
Room temperature
T
Rw
Setpoint for NORMAL room temperature
T
Rw
Setpoint for REDUCED room temperature
T
Rx
Actual value of room temperature
T
Rw
Room temperature setpoint
T
Rw
Boost of room temperature setpoint (with boost heating)
Duration of boost:
When using a room sensor, the boost is maintained until the room temperature
has reached the setpoint for NORMAL heating. Then, this setpoint applies again
Without room sensor, the room model calculates how long the boost will be
maintained. The duration is calculated according to the following formula:
T
Rw
- T
RM1
k
t
t
1
[ h ] = 2
*
———————
*
———
T
Rw
- T
Rw
20
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9.6.4 Parallel displacement of heating curve
The heating curve can be shifted parallel, manually with the knob for room tem-
perature readjustments. This readjustment is made by the end-user and covers
a range of 4.5...+4.5 °C room temperature.
The parallel displacement of the heating curve is calculated as follows:
Parallel displacement T
Flow
= ( T
Knob
)
*
( 1 + s )
20
10 0 -10 -20
-30
90
80
70
60
50
40
30
2522D10
100
0
10
10
0
30
T
R
w
T
A
T
V
Parallel displacement of heating curve
s Slope
T
A
Outside temperature
T
V
Flow temperature
T
Rw
Room temperature setpoint
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9.7 Generation of setpoint
9.7.1 Weather-compensated control
Weather-compensated control is used with all types of plants. The setpoint is gener-
ated via the heating curve as a function of the outside temperature. The tempera-
ture used is the composite outside temperature.
OZW30 SYNERGYR central unit Room temp. setpoint NORMAL
* Only active with room unit level Room temp. setpoint REDUCED
s Heating curve slope Room temp. setpoint holiday / protection
The impact of the OZW30 central unit is described in chapter 20.1.4 "Interplay with
SYNERGY
R central unit OZW30".
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Building Technologies 10 Function block: Actuator heating circuit 15.03.2011
10 Function block: Actuator heating circuit
This function block provides control of the heating circuit. It acts as follows, de-
pending on the type of plant:
Weather-compensated on the mixing valve of a space heating system
Weather-compensated on the valve in the primary return of a space heating
system with district heat connection
10.1 Operating lines
Line Function, parameter Factory setting (range) Unit
81 Maximum limitation flow temperature --- (--- / 0...140) °C
82 Minimum limitation flow temperature --- (--- / 0...140) °C
83 Maximum rate of flow temperature increase --- (--- / 1...600) K/h
84 Setpoint boost mixing valve/heat exchanger 10 (0...50) K
85 Actuator running time 120 (30...873) s
86 P-band of control 32.0 (1...100) K
87 Integral action time of control 120 (10...873) s
88 Type of actuator 1 (0 / 1)
89
Switching differential 2 (1...20) K
10.2 Limitations
10.2.1 Flow temperature limitations
The following settings can be made:
Maximum limitation of flow temperature: At the limit value, the heating curve
runs horizontally. This means that the flow temperature setpoint cannot exceed
the maximum value; it is limited
Minimum limitation of flow temperature: At the limit value, the heating curve runs
horizontally. This means that the flow temperature setpoint cannot fall below the
minimum value; it is limited (not with locking signals)
If the setpoint is limited, the display shows:
= maximum limitation
= minimum limitation
Both limitations can be deactivated (setting ---).
Minimum limitation can be overridden during storage tank charging, depending on
the kind of priority.
Settings
Impact on
d.h.w. heating
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Building Technologies 10 Function block: Actuator heating circuit 15.03.2011
10.3.2 3-position control
3-position control operates as weather-compensated PI flow temperature control.
The flow temperature is controlled via the modulating actuating device (mixing
valve or 2-port valve). There is no proportional offset, owing to the control system’s
I-action.
10.4 Auxiliary variables in interconnected plants
10.4.1 Temperature boost mixing valve/heat exchanger
A higher mixing valve or heat exchanger temperature can be entered on the con-
troller. This represents an increase of the respective heating zone's flow tempera-
ture setpoint. The higher setpoint is forwarded to heat generation as the heat de-
mand signal (in own controller or via data bus).
The increased mixing valve or heat exchanger temperature is set on the controller
that drives the mixing valve or 2-port valve (controller N2 in the example below)
(operating line 84).
Example:
N2
w
N2
w
N1
= w
N2
+ w
2522S07
w
N2 +
w
w
N1 Boiler temperature controller (heat generation)
N2 Flow temperature controller (heating zone)
w
N1
Setpoint of boiler temperature controller
w
N2
Setpoint of flow temperature controller
w Boost of mixing valve temperature (set on controller N2)
10.5 Pulse lock with 3-position actuator
If, during a total period of time equaling 5 times the running time, the 3-position
actuator received only CLOSE or only OPEN pulses, additional CLOSE pulses
sent by the controller will be locked. This minimizes strain on the actuator.
For safety reasons, however, the controller sends a 1-minute CLOSE pulse at
10-minute intervals.
A pulse in the opposite direction negates the pulse lock.
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Building Technologies 11 Function block: Boiler 15.03.2011
If the boiler temperature falls below 5 °C, the burner is always switched on and
keeps running until the boiler temperature exceeds its minimum limit by the amount
of the switching differential.
11.4.4 Protective boiler startup
If the boiler temperature falls below the minimum limit of the boiler temperature
while the burner is running, the temperature differential (minimum limit value minus
actual value) is integrated. From this, a critical locking signal is generated and
forwarded to the connected consumers. This causes the loads to reduce their
setpoints, aimed at consuming less energy. If the critical locking signal exceeds
a defined value, the boiler pump is deactivated as well.
If the boiler temperature returns to a level above the minimum limit, the integral is
reduced, resulting in a reduction of the critical locking signal.
If the integral falls below a defined level, the boiler pump is activated again. The
connected consumers increase their setpoints again.
When the integral reaches the value of zero, protective boiler startup becomes
inactive, in which case the critical locking signal is zero.
If protective boiler startup is active, the boiler temperature controller's display
shows
.
Protective boiler startup cannot be deactivated.
Chapter 17.4.6 "Locking signal gain" provides information on who receives the
boiler tem
perature controller's critical locking signal and how the consumers re-
spond to it.
Controller 1
Plant type 3-1
Controller 1 generates a critical locking
signal which deactivates the heating circuit
pump and the d.h.w. charging pump
2524B02e
Controller 1
Plant type 3-1
Controller 2
Critical locking signal
LPB
2524B03e
Controller 1 switches
pump M1 off and
shuts the heating
circuit mixing valve
Critical locking signal
Controller 3
11.4.5 Protection against boiler overtemperatures
To prevent heat from accumulating in the boilers (protection against overtempera-
ture), the controller provides a protective function.
When the first burner stage is shut down, the controller allows pump M1 to run
for the set overrun time (operating line 174 on the boiler temperature controller),
forwarding at the same time a forced signal to all loads (inside the controller and
on the data bus). If the boiler temperature controller is located in segment 0, the
forced signal is sent to all consumers in all segments. By contrast, if the boiler
temperature controller is located in segment 1...14, the signal is only sent to the
consumers in the same segment.
Autonomous unit
Interconnected plant
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Building Technologies 11 Function block: Boiler 15.03.2011
All consumers (heating and d.h.w. circuits) and heat exchangers that abruptly
reduce their heat request monitor the data bus during the set pump overrun time to
see if a forced signal is being sent by the boiler.
If no forced signal is received, the consumers and heat exchangers only perform
pump overrun (refer to chapter 17.4.3 "Pump overrun").
If, in this time window, a forced signal is received, the consumers continue to
draw heat from the boiler in the following manner:
Plant types with heating circuits using a mixing valve/2-port valve maintain
the former setpoint
Plant types with pump heating circuits allow the pumps to run
t
2522D13e
Boiler controller, stage 1
Forced signal
Overrun time
of boiler pump
Pump
Off
Y
t Time
Y Control signal boiler pump
If the boiler sets the forced signal to zero, the consumers and heat exchangers that
had responded to the forced signal act as follows:
They close the mixing valves/2-port valves
Their pumps continue to run for the set overrun time and then stop
D.h.w. discharging protection takes priority over protection against boiler overtem-
peratures.
11.5 Operating mode of pump M1
For pump M1, it can be selected via operating line 99 whether or not it shall run
during protective boiler startup:
Circulating pump without deactivation (setting 0):
The circulating pump runs when one of the consumers requests the boiler to
supply heat and when burner stage 1 is on, hence, during protective boiler
startup also
Circulating pump with deactivation (setting 1):
The circulating pump runs when one of the consumers requests the boiler to
supply heat. During protective boiler startup, the pump is deactivated
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Building Technologies 14 Function block: D.h.w. 15.03.2011
14.14 Manual d.h.w. charging
D.h.w. charging can be started manually by pressing the d.h.w. button for 5
seconds. For confirmation, the button flashes for 5 seconds.
Manual d.h.w. charging is also active when …
d.h.w. heating is not released,
the d.h.w. temperature lies inside the switching differential,
d.h.w. heating is switched off,
d.h.w. heating is switched off due to the holiday period,
d.h.w. heating is locked because the maximum charging time has been
exceeded.
Manually started charging is aborted only if the d.h.w. temperature setpoint is
reached or if the maximum charging time has been exceeded.
After manual charging, d.h.w. heating always remains on, that is, irrespective of
whether or not it was off or already on before manual charging was started.
If d.h.w. heating shall be switched off again after manual charging, the button must
be pressed again after it flashes (button extinguishes).
Manual charging is not possible when heating the d.h.w. with an electric immersion
heater.
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Building Technologies 16 Function block: Legionella function 15.03.2011
The following graph shows the behavior of the legionella function as a function of
the d.h.w. temperature:
ON
OFF
ON
OFF
T
BWx
ON
OFF
Circulating pump
Forced charging
Release of legionella function
Start conditions for legionella function fulfilled
Start dwelling time
Reset dwelling time
Start dwelling time
Dwelling time has elapsed
T
BWx
D. h.w. temperature
T
BWw
D.h.w. temperature setpoint
SD
BW
Switching differential of d.h.w. charging
t Time
It set, a maximum d.h.w. charging time is also active here. If the legionella setpoint
is not reached, the legionella function is interrupted to be resumed on completion
of the maximum charging time.
The maximum d.h.w. temperature setpoint has no impact on the legionella setpoint.
71


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