Siemens RVP340 Owner Manual
Siemens RVP340 is a heating controller for 1 heating circuit. It is a basic device that can be used to control a variety of heating systems, including those with radiators, underfloor heating, and fan coils. The RVP340 is easy to install and use, and it comes with a variety of features that make it a great choice for controlling your home's heating system.
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RVP340
Heating controller for 1 heating circuit
RVP350 and RVP351
Heating controllers for 1 heating circuit and d.h.w.
Basic Documentation
Edition 1.0
Controller series A
CE1P2545en
15.03.2011 Building Technologies
Siemens Switzerland Ltd
Industry Sector
Building Technologies Division
Gubelstrasse 22
CH 6301 Zug
Tel. +41 41 724 24 24 www.siemens.com/sbt
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Basic Documentation RVP340, RVP350, RVP351
© 2011 Siemens Switzerland Ltd
Subject to change
CE1P2545en
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Contents
2
2.1
2.2
2.3
2.4
2.5
1
1.1
1.2
Brief description and key features.............................................................9
1.3
Equipment combinations...........................................................................9
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
Types of houses and buildings................................................................ 11
Types of heating systems ....................................................................... 11
3.4
3.5
3.6
3.7
3.8
3
3.1
3.2
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
Heating circuit operating modes .............................................................16
D.h.w. heating modes .............................................................................17
Plant type and operating mode ...............................................................18
Operating state and operating level ........................................................18
4
Acquisition of measured values..........................................................19
4.1
Room temperature (A6, B5) ....................................................................19
4.1.1
4.1.2
4.1.3
4.2
Flow temperature (B1) ............................................................................20
4.2.1
4.2.2
4.3
Boiler temperature (B2)...........................................................................20
4.3.1
4.3.2
4.4
Outside temperature (B9) .......................................................................20
4.4.1
4.4.2
4.5
Return temperature (B7) .........................................................................21
4.5.1
4.5.2
4.6
Storage tank temperature (B31, B32) .....................................................21
4.6.1
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4.6.2
4.7
Collector temperature (B6)......................................................................22
4.7.1
4.7.2
5
5.1
Function block: End-user space heating....................................................23
5.2
5.2.1
5.2.2
Frost protection for the building...............................................................23
5.3
5.4
5.5
7
7.1
7.2
7.3
7.4
8
8.1
8.2
6
6.1
Function block: End-user d.h.w...........................................................25
6.2
6.2.1
NORMAL d.h.w. temperature setpoint ....................................................25
6.2.2
REDUCED d.h.w. temperature setpoint..................................................25
6.3
Function block: End-user general.......................................................27
Scheduler program 2...............................................................................27
Function block: Plant configuration ...................................................29
9
9.1
Function block: Space heating ............................................................30
9.2
Automatic ECO function..........................................................................30
9.2.1
Compensating and auxiliary variables ....................................................30
9.2.2
9.2.3
9.3
Room temperature source ......................................................................32
9.4
9.4.1
9.4.2
9.4.3
Optimization with room sensor................................................................33
9.4.4
Optimization without room sensor...........................................................33
9.4.5
9.4.6
Room model temperature .......................................................................34
9.4.7
9.4.8
9.4.9
Optimized switching on ...........................................................................36
9.4.10
9.5
9.5.1
Maximum limitation of room temperature................................................37
9.5.2
9.6
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9.6.1
9.6.2
9.6.3
9.6.4
Parallel displacement of heating curve ...................................................40
9.7
9.7.1
Weather-compensated control................................................................41
10
Function block: Actuator heating circuit ....................................................42
10.1
10.2
10.2.1
Flow temperature limitations ...................................................................42
10.2.2
10.3
10.3.1
10.3.2
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
11.2
11.3
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
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
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
12.2
12.3
Minimum limitation of return temperature ...............................................51
12.3.1
12.3.2
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
13.2
13.2.1
Maximum limitation of primary return temperature .................................54
14
Function block: D.h.w...........................................................................56
14.1
14.2
Assignment of d.h.w. heating ..................................................................56
14.3
Program for the circulating pump............................................................56
14.4
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14.5
Release of d.h.w. heating........................................................................57
14.5.1
14.5.2
14.5.3
D.h.w. heating during holiday periods .....................................................58
14.6
Priority and flow temperature setpoint ....................................................58
14.6.1
14.6.2
14.6.3
14.6.4
14.6.5
14.6.6
Flow temperature setpoint.......................................................................60
14.6.7
14.6.8
14.7
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
14.13
Protection against discharging................................................................63
14.13.1
14.13.2
14.14
Manual d.h.w. charging ...........................................................................64
15
Function block: Multifunctional relays.....................................................65
15.1
15.2
Functions of multifunctional relays K6/K7 ...............................................65
15.2.1
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
15.2.5
15.2.6
16
Function block: Legionella function ...................................................69
16.1
16.1.1
16.1.2
Periodicity of legionella function..............................................................69
16.1.3
16.1.4
Dwelling time at legionella setpoint.........................................................69
16.1.5
Operation of circulating pump .................................................................70
16.2
17
Function block: Service functions and general settings ..................72
17.1
17.2
17.2.1
17.2.2
17.3
17.3.1
Simulation of outside temperature ..........................................................73
17.3.2
17.3.3
17.4
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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
17.4.4
17.4.5
Winter-/summertime changeover............................................................77
17.4.6
17.5
Inputs for LPB (RVP340 and RVP350) ...................................................79
17.5.1
17.5.2
Outside temperature source ...................................................................80
17.5.3
Addressing the devices...........................................................................80
17.5.4
17.5.5
18
Function block: Solar d.h.w. ................................................................82
18.1
18.2
18.3
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
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
19
Function block: Locking functions .....................................................89
19.1
19.2
Locking settings on the software side .....................................................89
20
20.1
20.1.1
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
21.1
21.1.1
21.1.2
21.1.3
Setting levels and access rights..............................................................97
21.2
21.2.1
21.2.2
21.3
21.3.1
21.3.2
21.3.3
22
22.1
Connection terminals ............................................................................100
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22.2
Connection diagrams ............................................................................101
22.2.1
22.2.2
23
Mechanical design ..............................................................................103
23.1
23.2
24
24.1
24.2
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Contents
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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 storage 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.
Data Sheet RVP340, RVP350, RVP351 N2545
Installation Instructions RVP340,
RVP350, RVP351 (de, en, fr, it, nl, es, el, and ru)
G2545
B2545 Operating Instructions RVP340,
RVP350, RVP351 (de, en, fr, it, nl, es, el, and ru)
CE Declaration of Conformity T2545
Environmental Declaration
LPB Basic System Data
LPB Basic Engineering Data
E2545
N2030
N2032
Stock no.
STEP Web Client
74 319 0815 0
74 319 0816 0
STEP Web Client
STEP Web Client
STEP Web Client
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 weathercompensated 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 buildings. 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 demanddependent 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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Note
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
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
End-user
Heating engineer
Locking level
Function block
Space heating
D.h.w.
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
Solar d.h.w.
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
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3.2.2 Plant types with regard to d.h.w.
Note
Plant types
RVP340:
Plant types 1 - 0 and 2 - 0
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 mixing valve
1–1 Space heating with mixing valve
2–0 Space heating with district heat
3–0 Space heating with mixing valve and precontrol with boiler
No d.h.w.
Storage tank with charging pump
No d.h.w.
No d.h.w.
3–1 Space heating with mixing valve and precontrol
Storage tank with charging pump
with boiler
* In terms of functions, RVP350 and 351 are identical. The only difference is that RVP351 has no
communication capability via LPB
RVP350 and RVP351
Plant types 1 - x
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Plant types 3 - x
Key to plant components
Components shown in broken lines are optional.
A6 Room unit
B1 Flow sensor
B2 Boiler sensor
Kx K6, K7 = multifunctional outputs
K4 Burner stage 1
K5 Burner stage 2
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B5 Room sensor
B6 Collector sensor
B7 Return sensor
M2 Heating circuit pump
M3 Storage tank charging pump
N1 Controller RVP3..
Y1 Actuator heating circuit
3.3 Setting levels, function blocks, and plant types
Op. level Function block
End-user
Heating engineer
End-user space heating
End-user d.h.w.
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
Solar d.h.w.
Locking level Locking functions
The above table shows …
Plant type
1-0 1-1 2-0 3-0 3-1
which function blocks are assigned to the 3 operating levels,
which function blocks are activated with the different plant types.
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3.4 Heating circuit operating modes
The required operating mode is selected on the controller by pressing the respective 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 consideration 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 controlled 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
Yes 1–0, 2–0, 3–0
1–1, 3–1
Yes Yes Yes Yes No
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, depending on the operating mode. The operating level is determined by the heating program 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 interface), 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 (setting 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 Acquisition of measured values
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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 deactivated 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
4.4.2 Error handling
In the event of a short-circuit or an interruption of the measuring circuit, the controller responds as follows, depending on the outside temperature source:
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1 storage tank sensor
(operating line 126 = 0)
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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 outside temperature is available via data bus, the control uses a fixed outside temperature 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 connected 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 controller 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 temperature 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 message is delivered. D.h.w. is no longer heated; the charging pump will be deactivated.
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2 storage tank sensors
(operating line 126 = 1)
1 storage tank thermostat
(operating line 126 = 2)
2 storage tank thermostats (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)
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 message is delivered.
If both measuring circuits do not produce a valid measured value, 2 error messages are 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 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 controller 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 message 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 message is delivered.
If both measuring circuits do not produce a valid measured value, 2 error messages are delivered. D.h.w. is no longer heated; the charging pump and the collector 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 sensing 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 delivered with a delay of 12 hours and the collector pump is deactivated. This means that solar d.h.w. heating is no longer provided.
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5 Function block: End-user space heating
This function block provides settings that the end-user himself can make.
5.1 Operating lines
Line Function, parameter
1 Room temperature setpoint for NORMAL heating
2 Room temperature setpoint for REDUCED heating
3 Room temperature setpoint for holiday/protection mode
4 Weekday, for entering the heating program
5 1st heating phase, start of NORMAL heating
6 1st heating phase, end of NORMAL heating
7 2nd heating phase, start of NORMAL heating
8 2nd heating phase, end of NORMAL heating
9 3rd heating phase, start of NORMAL heating
10 3rd heating phase, end of NORMAL heating
12 Date of first day
13 Date of last day
14 Heating curve, flow temperature setpoint at an outside temperature of 15 °C
15 Heating curve, flow temperature setpoint at an outside temperature of -5 °C
5.2 Setpoints
Factory setting (range)
20.0 (0…35)
14.0 (0…35)
10.0 (0…35)
1-7 (1…7 / 1-7)
06:00 (00:00…24:00)
22:00 (00:00…24:00)
--:-- (00:00…24:00)
--:-- (00:00…24:00)
--:-- (00:00…24:00)
--:-- (00:00…24:00)
--.-- (01.01…31.12)
--.-- (01.01…31.12)
30 (20…70)
60 (20…120)
5.2.1 General
°C
The setpoints for the NORMAL and the REDUCED room temperature and for holiday/protection mode are entered directly in °C room temperature. They are independent of whether or not the control uses a room sensor.
5.2.2 Frost protection for the building
The lowest valid room temperature setpoint always corresponds to at least the setpoint for holiday/protection mode (setting on operating line 3), even if lower setpoints for the NORMAL and the REDUCED room temperature have been entered
(settings on operating lines 1 and 2).
If a room sensor is used and the room temperature falls below the setpoint for holiday/protection mode, the automatic ECO function – if available – aborts the OFF mode until the room temperature has risen 1 °C above the setpoint for holiday/protection mode.
Unit
°C
°C
°C
- hh:mm hh:mm hh:mm hh:mm hh:mm hh:mm dd:mm dd:mm
°C
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Caution
5.3 Heating program
The heating program offers a maximum of 3 heating phases per day; in addition, every weekday can have different heating phases.
The inputs to be made are not the switching times, but the periods of time during which the NORMAL room temperature shall be maintained. These periods of time are usually identical with the building's occupancy times. The effective switching times for changing from the REDUCED to the NORMAL room temperature, and vice versa, are calculated by the optimization function ( precondition: optimization is activated).
Using setting "1-7" on operating line 4, a heating program applying to all weekdays can be entered. This simplifies the settings. If weekend times differ, enter the times for the entire week first, then change days 6 and 7 as required.
The entries are sorted and overlapping heating phases are combined.
5.4 Holiday program
One holiday period per year can be programmed. At 00:00 of the first day of the holiday period, switching over to the setpoint for holiday/protection mode takes place. At 24:00 of the last day of the holiday period, the controller switches to
NORMAL or REDUCED heating in accordance with the time switch settings.
The settings for the holiday period are cleared as soon as the holidays have elapsed. The holiday function switches off d.h.w. heating and the circulating pump, depending on the settings made on operating line 121.
The holiday program is only active in AUTO mode.
5.5 Heating curve
The heating curve can be adjusted on operating lines 14 and 15. For more
detailed information, refer to chapter 9.6 "Heating curve".
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Note
6 Function block: End-user d.h.w.
This function block provides settings for the d.h.w. temperature that the end-user himself can make.
6.1 Operating lines
Line Function, parameter
26 NORMAL setpoint for d.h.w. temperature
27 Display of current d.h.w. temperature
28 REDUCED setpoint for d.h.w. temperature
6.2 Setpoints
Factory setting (range)
55 (20...100)
Display function
40 (8...80)
Unit
°C
°C
°C
The d.h.w. temperature setpoints are to be entered in °C. When using thermostats, it must be made certain that the NORMAL setpoint entered here agrees with the setpoint of the thermostat or – if 2 thermostats are used – of both thermostats. If there is a deviation, the charging temperature cannot be correctly calculated (charging temperature = setpoint [operating line 26] + boost of charging temperature
[operating line 127]).
If d.h.w. heating is switched to the electric immersion heater, setpoint adjustment becomes inactive, since the thermostat of the electric immersion heater ensures temperature control of the storage tank.
The d.h.w. temperature setpoints for NORMAL and REDUCED are used when the d.h.w. heating mode is set to ON.
With OFF and during holiday periods, the frost protection setpoint applies.
6.2.1 NORMAL d.h.w. temperature setpoint
As soon as d.h.w. charging is released, the controller tries to heat up the storage tank until the "NORMAL setpoint of d.h.w. temperature" is reached (operating line
26).
Release of d.h.w. charging always takes place according to the settings made on operating line 123 (always according to heating program or scheduler program 2).
6.2.2 REDUCED d.h.w. temperature setpoint
Outside the release times for charging to the NORMAL setpoint of the d.h.w. temperature, the d.h.w. is heated up to the REDUCED setpoint (operating line 28).
When using thermostats, the REDUCED setpoint of the d.h.w. temperature is deactivated since the thermostat determines the switch on/off temperature.
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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 displayed. 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
32 Start of 1st ON phase
33 End of 1st ON phase
34 Start of 2nd ON phase
1-7 (1...7, 1-7)
05:00 (--:-- / 00:00...24:00)
22:00 (--:-- / 00:00...24:00) hh:mm hh:mm
35 End of 2nd ON phase
36 Start of 3rd ON phase
--:-- (--:-- / 00:00...24:00) hh:mm
--:-- (--:-- / 00:00...24:00) hh:mm
--:-- (--:-- / 00:00...24:00) hh:mm
37 End of 3rd ON phase
38 Time of day
--:-- (--:-- / 00:00...24:00) hh:mm
(00:00...23:59) hh:mm
39 Weekday Display
40 Date
41 Year
(01.01. ... 31.12.) dd:mm
(2009...2099) yyyy
50 Faults Display
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 weekday 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
20
Fault outside sensor B9
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 controller causing the fault is displayed on all the other controllers. But no address appears 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
51 Plant type
8.2 General
RVP340
RVP35..
Factory setting (range)
1 0 (1–0, 2–0)
3–1 (1–1, 3–0, 3–1)
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 activated.
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
61 NORMAL heating limit (ECO day)
62 REDUCED heating limit (ECO night)
63 Building time constant
64 Quick setback
65 Room temperature source
66 Type of optimization
67 Maximum heating up period
68 Maximum early shutdown
69 Maximum limitation room temperature
70 Influence of room temperature (gain factor)
71 Boost of room temperature setpoint on boost heating
9.2 Automatic ECO function
Factory setting (range) Unit
17.0 (--.- / 5...25) °C
5.0 (--.- / –5...25)
20 (0...50)
°C h
1 (0 / 1)
A (0…3 / A)
0 (0 / 1)
00:00 (00:00...42:00) h
0:00 (0:00...6:00) h
--.-- (--.- / 0...35)
4 (0...20)
5 (0...20)
°C
°C
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 currently 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 function 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 temperature 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 temperature is attenuated. Hence, it represents the impact of short-time outside temperature 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 temperature is considerably dampened. This ensures that no heating is provided in
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Switching the heating off
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T
A
(B9 rsp. BUS)
T
A k t
T
AM k t
T
AD
Generation of composite and attenuated outside temperature
T
A
Current outside temperature
T
AD
Attenuated outside temperature
T
A
T
AM
Composite outside temperature k t
Building time constant
25
T
A
20
T
AD
15
T
AM
10
5
0 t
Progression of current, composite and attenuated outside temperature
T
A
Current outside temperature
T
AD
Attenuated outside temperature
9.2.2 Heating limits
T
AM
Composite outside temperature t Time
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 sufficient to maintain the required room temperature level.
When the automatic ECO function switches the heating off, the display shows ECO.
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Switching the heating on
Operating modes and operating states
The heating is switched on again only when the 3 following conditions are satisfied:
The current outside temperature has fallen 1 °C below the current ECO heating limit
The composite outside temperature has fallen 1 °C below the current ECO heating limit
The attenuated outside temperature has fallen 1 °C below the "ECO day" heating limit
The action of the automatic ECO function depends on the operating mode:
Operating mode or
operating state
Automatic
ECO function
Active
Current heating limit
Automatic operation
Continuously REDUCED heating
ECO day or ECO night
Continuously NORMAL heating
Inactive –
Protection/holiday mode
Manual control
Active
Inactive
ECO night
–
9.3 Room temperature source
The outside temperature source can be selected via operating line 65.
The following settings can be made:
Op. line 65 Room temperature source
0
1
2
3
No room sensor
Room unit connected to terminal A6
Room sensor connected to terminal B5
Mean value of the devices connected to terminals
A6 and B5
In addition, the room temperature source used by the controller is shown on operating line 65 and appears as a number on the right side of the LCD:
0 = controller operates without sensor
1 = controller operates with room unit connected to terminal A6
2 = controller operates with room unit connected to terminal B5
3 = controller operates with mean value of the devices connected to A6 and B5
9.4 Optimization
9.4.1 Definition and purpose
Operation of the heating system is optimized. EN 12 098 defines optimization as automatic shifting of the switch-on and switch-off points aimed at saving energy.
This means that…
switching on and heating up as well as switching off are controlled such that during building occupancy times the required room temperature level is always ensured,
the smallest possible amount of heating energy is used to achieve this objective.
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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 switching 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 continually 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 consideration.
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
T
Rw
T
Rw
T
Rw
T
Rx
T
Rw
HP t
T
R t t Zeit
1
Forward shift for early shutdown
2 t
3
Forward shift to start heating up
T
Rw
Room temperature setpoint
T
Rw
T
Rw
Setpoint for NORMAL room temperature
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 t
) × e 3 × kt + T
AM
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T
Rw
T
Rw
T
RM
T
Rw t
1
Progression of room temperature generated by the room model e k t t t
1
2.71828 (basis of natural logarithms)
Building time constant in hours
Time in hours
Quick setback
T
AM
Composite outside temperature
T
R
Room temperature
T
RM
Room model temperature
T
Rw
T
Rw
Setpoint for NORMAL room temperature
Setpoint for REDUCED room 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 switchover 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 [ h ] = 3
*
k t
T
Rw
- T
AM
*
(- ln ———————— )
T
Rw
- T
AM where: ln Natural logarithm k t t
Building time constant in hours
Duration of quick setback
T
AM
Composite outside temperature
T
Rw
T
Rw
Setpoint for NORMAL room temperature
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 control to boost heating; this means that the set boost is added to the room temperature setpoint. Optimization calculates the switchover point such that, when occupancy 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
T
Rw
Forward shift
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
R
T
Rw
T
Rw
T
Rw
T
Rw
T
Rx t t Time
T
R
T
T
Rw
Rw
Setpoint for NORMAL room temperature
Setpoint for REDUCED room temperature
T
T
Rx
Rw
Actual value of room temperature
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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The duration of boost is limited to 2 hours.
T
R
T
Rw
T
Rw
T
Rw
T
RM
T
Rw
T
RM1 where: t
1 t k
t t t
1
Building time constant in hours
Time
Duration of boost of room temperature setpoint with boost heating
T
R
T
Rw
T
Rw
T
RM
Setpoint for NORMAL room temperature
Setpoint for REDUCED room temperature
Room model temperature
T
RM1
Room model temperature when boost heating is started
T
Rw
Room temperature setpoint
T
Rw
Boost of room temperature setpoint (with boost heating)
9.5 Room functions
9.5.1 Maximum limitation of room temperature
For the room temperature, it is possible to have adjustable maximum limitation.
Required for that purpose is a room sensor or room unit.
A room temperature lying 1 °C above the limit value leads to a room temperature setpoint reduction of 4 °C.
Maximum limitation of the room temperature is independent of the setting made for the room influence.
If the room temperature lies above the limit value, the display shows .
The flow temperature setpoint reduction T
Vw
is calculated as follows:
T
Vw
[K] = T
Rw *
( 1 + s )
T
Rw
-1 -0,5 0,5 1 1,5 s
T
Heating curve slope
Rw
Room temperature setpoint reduction
T
R
Deviation of the room temperature
T
Vw
Flow temperature setpoint reduction
2 2,5 3
T
R
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9.5.2 Room influence
The room temperature is included in the control process. Required for that purpose is a room sensor or room unit.
A gain factor for the room temperature’s influence on flow temperature control can be adjusted. This gain factor indicates to what extent deviations of the current room temperature from the room temperature setpoint have an impact on flow temperature control:
0 = no impact of room temperature deviation on the generation of setpoint
20 = maximum impact of room temperature deviation on the generation of setpoint
The room temperature setpoint change T
Rw
is calculated according to the following formula:
T
VF
Rw
[K] = ————— * ( T
2
Rw
- T
Rx
)
T
Rw
T
R
T
Rw
The flow temperature setpoint change T
Vw
resulting from the change of room temperature setpoint is calculated as follows:
T
Vw
[K] = T
Rw *
( 1 + s ) s Heating slope
T
Rw
T
Rw
Room temperature setpoint
Change of room temperature setpoint
T
Rw
Reduction of room temperature setpoint
+ T
Rw
Increase of room temperature setpoint
T
Rx
T
R
T
Vw
Actual value of room temperature
Deviation of room temperature (T
Rw
- T
Rx
)
Change of flow temperature setpoint
9.6 Heating curve
9.6.1 Purpose
With space heating systems, flow temperature control is always weathercompensated. The heating curve assigns the flow temperature setpoint to the prevailing outside temperature.
9.6.2 Settings
The heating curve settings are made via 2 operating lines.
The following settings are required:
Flow temperature setpoint at an outside temperature of 5 °C
Flow temperature setpoint at an outside temperature of 15 °C
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The basic settings during the commissioning phase are made based on the planning documentation or according to local practices.
They are made on operating lines 14 and 15:
Op. line Setpoint
14
15
Flow temperature setpoint at an outside temperature of 15 °C
Flow temperature setpoint at an outside temperature of –5 °C
T
Vw
80
70
60
50
40
30
20
10
120
110
100
90
20 15
BZ 14
10 5 0 -5
BZ 15
-10 -15 -20 -30 T
A
Heating curve diagram showing the basic settings
BZ 14 Setting operating line 14, flow temperature setpoint at an outside temperature of 15 °C
BZ 15 Setting operating line 15, flow temperature setpoint at an outside temperature of –5 °C
T
A
T
Vw
Outside temperature
Flow temperature setpoint
9.6.3 Deflection
The heat losses of buildings are proportional to the difference of room temperature and outside temperature. By contrast, the heat output of radiators does not increase proportionally when the difference of radiator and room temperature increases. For this reason, the radiators' heat exchanger characteristic is deflected.
The heating curve's deflection takes these properties into consideration.
In the range of small slopes (e.g. with floor heating systems), the heating curve is practically linear – due to the small flow temperature range – and therefore corresponds to the characteristic of low temperature heating systems.
Slope ”s” is calculated according to the following formula:
T
Vw( 5)
T
Vw(+15) s = ————————— s
T
Heating curve slope
Vw( 5)
Flow temperature setpoint at an outside temperature of 5 °C
T
Vw(+15)
Flow temperature setpoint at an outside temperature of 15 °C
The heating curve is valid for a room temperature setpoint of 20 °C.
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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 temperature 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 )
T
V
100
60
50
40
30
90
80
70
30
-20 -30 T
A
10
20 10 0
10
0
0
T
Rw
Parallel displacement of heating curve s Slope
T
A
Outside temperature
T
V
T
Rw
Room temperature setpoint
-10
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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 generated via the heating curve as a function of the outside temperature. The temperature used is the composite outside temperature.
OZW30 SYNERGYR central unit
* Only active with room unit level
Room temp. setpoint NORMAL
Room temp. setpoint REDUCED
Room temp. setpoint holiday / protection
The impact of the OZW30 central unit is described in chapter 20.1.4 "Interplay with
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Settings
Impact on d.h.w. heating
10 Function block: Actuator heating circuit
This function block provides control of the heating circuit. It acts as follows, depending 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
81 Maximum limitation flow temperature
82 Minimum limitation flow temperature
83 Maximum rate of flow temperature increase
84 Setpoint boost mixing valve/heat exchanger
85 Actuator running time
86 P-band of control
87 Integral action time of control
88 Type of actuator
89 Switching differential
Factory setting (range)
--- (--- / 0...140)
--- (--- / 0...140)
--- (--- / 1...600)
10 (0...50)
120 (30...873)
32.0 (1...100)
120 (10...873)
1 (0 / 1)
2 (1...20)
Unit s
K s
K
°C
°C
K/h
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.
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10.2.2 Setpoint increase
T
Vw
T
Vw
Maximum increase: = ––––––––
t
T
Vw t t Time unit t
T
Vw
Flow temperature setpoint
T
Vw
Setpoint increase per time unit
The rate of increase of the flow temperature setpoint can be limited to a maximum
(heating up brake). In that case, the maximum the flow temperature setpoint can increase is the set temperature per time unit (°C per hour). This function …
prevents cracking noises in the piping,
protects objects and construction materials that are sensitive to quick temperature increases (e.g. antiquities),
prevents excessive loads on the heat source.
This function can be deactivated (setting ---).
10.3 Type of actuator
The type of actuator or type of control can be selected via operating line 88:
0 = 2-position control
1 = 3-position control
10.3.1 2-position control
2-position control operates as weather-compensated flow temperature control.
Flow temperature control is provided by the ON/OFF action of the actuating device
(valve). The switching differential required for this type of control can be set via operating line 89.
SD
2
SD
2
ON
OFF
T
Vw
ON Actuator operating
OFF Actuator dead
SD Switching differential (operating line 89)
T
V
Flow
T
Vw
Flow temperature setpoint
T
V
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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 controller. This represents an increase of the respective heating zone's flow temperature setpoint. The higher setpoint is forwarded to heat generation as the heat demand 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: w
N2 +
w w
N1
= w
N2
+ w w
N2
w
N2
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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11 Function block: Boiler
Function block "Boiler" acts as a 2-position controller and is used for direct burner control. It operates as a demand-dependent boiler temperature controller of a common flow, which supplies heat to one or several consumers.
11.1 Operating lines
Line Function, parameter
91 Boiler operating mode
92 Maximum limitation boiler temperature
93 Minimum limitation boiler temperature
94 Switching differential boiler
95 Minimum limitation burner running time
96 Burner stage 2 release integral
97 Burner stage 2 reset integral
98 Burner stage 2 locking time
99 Operating mode pump M1
11.2 Operating mode
Factory setting (range)
0 (0...2)
95 (25...140)
10 (5...140)
6 (1...20)
4 (0...10)
50 (0...500)
10 (0...500)
20 (0...40)
1 (0 / 1)
The boiler’s operating mode for situations when there is no demand for heat (e.g. due to the automatic ECO function) can be selected. There is a choice of 3 operating modes:
With manual shutdown: The boiler is shut down when there is no heat request and protection mode is selected (setting 0 on operating line 91)
With automatic shutdown: The boiler is shut down when there is no heat request, irrespective of the selected operating mode (setting 1 on operating line
91)
Without shutdown: The boiler is never shut down; it always maintains the minimum setpoint (setting 2 on operating line 91)
The table applies when there is no demand for heat.
Operating mode of
controller
Protection mode
Manual
shutdown
Boiler OFF
Operating mode of boiler
Automatic Without
shutdown shut-down
Boiler OFF Boiler at minimum limit value
AUTO Boiler at minimum limit value
Boiler OFF
REDUCED Boiler at minimum limit value
Boiler OFF
Boiler at minimum limit value
Boiler at minimum limit value
NORMAL
Boiler at minimum limit value
Boiler OFF Boiler at minimum limit value
If there is demand for heat, the boiler always supplies heat, which means that the boiler's operating mode in that case is always ON.
Unit
°C
°C
K min
°C*min
°C*min min
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11.3 Limitations
11.3.1 Maximum limitation of boiler temperature
For maximum limitation of the boiler temperature, the maximum limit value can be set. The switch-off point cannot be higher than the maximum limit value.
The switch-on point is then lower, the difference being the set switching differential.
If the boiler temperature is limited to a maximum, the display shows .
This maximum limitation is not a safety function; for that purpose, a thermostat or thermal reset limit thermostat, etc., must be used!
11.3.2 Minimum limitation of boiler temperature
For minimum limitation of the boiler temperature, the minimum limit value can be set. The switch-on point cannot fall below the minimum limit value.
The switch-off point is then higher, the difference being the set switching differential.
If the boiler temperature is limited to a minimum, the display shows .
11.3.3 Actions during d.h.w. heating
Maximum and minimum limitation are also active during d.h.w. heating.
11.4 2-position control
2-position control maintains the required boiler temperature by switching a 1- or 2stage burner.
11.4.1 Control with 1-stage burner
For 2-position control with a 1-stage burner, the variables that can be set are the switching differential and the minimum burner running time.
The controller compares the actual value of the boiler temperature with the setpoint. If the boiler temperature falls by half the switching differential below the setpoint, the burner is switched on. If the boiler temperature exceeds the setpoint by half the switching differential, the burner is switched off.
SD
2
SD
2
ON
OFF
T
Kw
T
K
T
Kw
Boiler temperature setpoint
T
K
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Control process
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If there is no more deviation before the minimum burner running time has elapsed, the burner will nevertheless continue to operate until that time has elapsed (burner cycling protection). This means that the minimum burner running time has priority.
Maximum limitation of the boiler temperature is maintained, however, which always leads to burner shutdown.
T
K
T
Kx
T
Kw
+ 0,5
*
SD
T
Kw
T
Kw
- 0,5
*
SD
Y
B
1 t
0 t Time
T
Kw
Boiler temperature setpoint
T
Kx
Actual value of boiler temperature
T
Kx
Boiler Y
B
Burner control signal
Note on setting: When controlling a 1-stage burner, the reset integral of the second stage should be set to zero.
11.4.2 Control with 2-stage burner
For 2-position control with a 2-stage burner, the variables that can be set are the switching differential and the minimum burner running time – the latter now applying to both stages – plus the following variables:
The release integral (FGI) for the second stage. This is the variable generated from the progression of temperature (T) and time (t). If the maximum limit is exceeded, the second burner stage is released and can be switched on. Prerequisite is that the minimum locking time for the second stage has elapsed.
FGI =
0 t
T dt where: T = ( w 0.5
*
SD x ) > 0
The reset integral (RSI). This is a variable generated from the progression of temperature and time. If the maximum limit is exceeded, the burner is locked and shuts down.
RSI =
0 t
T dt where: T = ( x w + 0.5
*
SD ) > 0
The minimum locking time for the second stage, which is the period of time on completion of which the second stage can switch on at the earliest
The controller compares the actual value of the flow temperature with the setpoint.
If it falls by half the switching differential (x < w 0.5
*
SD) below the setpoint, the first burner stage is switched on. At the same time, the minimum waiting time for the second burner stage commences and the release integral is being generated.
The controller ascertains for how long and by how much the flow temperature remains below w 0.5
*
SD. It continuously generates the integral based on the progression of temperature and time.
If, on completion of the minimum locking time, the flow temperature lies below w 0.5
*
SD, and the release integral reaches the set maximum limit, the second burner stage is released and switched on. The flow temperature rises.
If the flow temperature exceeds the setpoint by half the switching differential
(x = w + 0.5
*
SD), the second burner stage is switched off again, but remains
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released. The first stage continues to operate. If the flow temperature drops again, the second stage is switched on again at x < w 0.5
*
SD. Now, the setpoint is maintained with the help of the second burner stage.
If, however, the flow temperature continues to rise (x > w + 0.5
*
SD), the controller starts generating the reset integral. It determines for how long and to what extent the flow temperature remains above the setpoint by half the switching differential. It continuously generates the reset integral based on the progression of temperature and time. When the reset integral reaches the set maximum limit, the second burner stage is locked and the first stage is shut down.
The minimum locking time and calculation of the release integral at x < w 0.5
SD are started when the switch-on command for the first burner stage is given.
*
Due to the time-temperature integral, it is not only the duration of the deviation that is considered but also its extent when deciding whether the second stage shall be released or locked.
SD Switching w Boiler temperature setpoint x Actual value of boiler temperature
T
Kx
T
Kw
+ 0,5
*
SD
T
Kw
- 0,5
*
SD t
Y
B1
1
0 t
INT max.
max.
0
FGI
RSI
RSI t
FG
B2
1
0 t
Y
B2
1
0 t
FG
B2
Release for burner stage 2
FGI Release integral
INT Integral
RSI Reset integral t
T
Kw
Time
Boiler temperature setpoint
T
Kx
Actual value of boiler temperature
Y
B1
Control signal for burner stage 1
Y
B2
Control signal for burner stage 2
11.4.3 Frost protection for the boiler
Frost protection for the boiler operates with fixed values:
Switch-on point: 5 °C boiler temperature.
Switch-off point: Minimum limit of boiler temperature plus switching differential.
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Autonomous unit
Interconnected plant
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 temperature controller's critical locking signal and how the consumers respond 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
Critical locking signal
Controller 1
Plant type 3-1
LPB
Controller 2
Controller 1 switches pump M1 off and shuts the heating circuit mixing valve
Controller 3
Critical locking signal
11.4.5 Protection against boiler overtemperatures
To prevent heat from accumulating in the boilers (protection against overtemperature), 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.
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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
Y
Off
Boiler controller, stage 1
Pump
Forced signal
Overrun time of boiler pump t 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 overtemperatures.
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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12 Function block: Setpoint return temperature limitation
On this function block, the setpoint for minimum limitation of the return temperature or the constant value for shifting maximum limitation of the return temperature can be adjusted.
12.1 Operating line
Line Function, parameter
101 Setpoint return temperature limitation, constant value
Factory setting (range)
--- (--- / 0...140)
Unit
°C
12.2 Description
The setpoint for minimum limitation of the return temperature (plant types 1 - x and
3 - x) or the constant value for shifting maximum limitation of the return temperature (plant type 2 - x) can be set on operating line 101.
The function can be deactivated by entering ---, which means that the return temperature will not be limited.
If the settings of this function block have been locked (refer to the respective section on operating line 248), the display shows when pressing and .
12.3 Minimum limitation of return temperature
Wherever possible or required, this function block provides minimum limitation of the boiler return temperature. This applies to …
plant type 1 - x, "Space heating with mixing valve", and
plant type 3 - x, "Space heating with mixing valve and precontrol with boiler".
Minimum limitation of the return temperature prevents boiler corrosion due to flue gas condensation.
12.3.1 Type of sensor
Suitable are Siemens sensors operating with a sensing element LG-Ni1000.
The sensor is to be installed in the return.
With plant type 1 - x, the return temperature signal can also be forwarded via LPB.
In interconnected plants, only 1 return temperature sensor per segment may be connected.
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12.3.2 Mode of operation
If the return temperature falls below the set minimum limit value, the temperature differential of minimum limit value and 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 return temperature returns to a level above the minimum limit value, the integral is reduced, resulting in a reduction of the critical locking signal. The connected consumers increase their setpoints again.
When the integral reaches the value of zero, minimum limitation of the return temperature becomes inactive, in which case the critical locking signal is zero.
If minimum limitation of the return temperature is active, the display shows .
Minimum limitation of the return temperature can be deactivated.
Chapter 17.4.6 "Locking signal gain" provides information on who receives the
critical locking signal and how the consumers respond to it.
The minimum limit value is to be set on operating line 101.
Setting --- = inactive.
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Variant 1
Central impact of limitation
Variant 2
Local impact of limitation
12.3.3 Mode of operation with an autonomous unit (without bus)
Operating line 101 = 50 °C
Return temperature sensor connected
Controller 2 generates internally a critical locking signal which shuts the heating circuit mixing valve and deactivates the charging pump
Without minimum limitation of the return temperature
12.3.4 Mode of operation in interconnected plants
Critical locking signal
Controller 1
Plant type no. 3-0
Setting operating line101 = 50 °C, return temperature detector connected.
Controller 1 shuts the heating circuit mixing valve
LPB
Critical locking signal
Controller 2
Plant type no. 1-0
Controller 2 shuts the heating circuit mixing valve
Setting operating line 101 = - - - , no own return temperature detector connected
Controller 3
Plant type no. 1-1
Controller 3 shuts the heating circuit mixing valve and deactivates the d.h.w. charging pump
Setting operating line 101 = - - - , no own return temperature detector connected
Controller 1
Boiler controller
(With no possibility of minimum limitation of return temperature)
LPB
Controller 2
Plant type no. 1-0
Controller 2 limits the return temperature to 50 °C min.
Setting operating line 101 = 50 °C, return temperature detector connected
Controller 3
Plant type no. 1-0
Controller 3 limits the return temperature to 40 °C min.
Return temperature signal
Setting operating line 101 = 40 °C, on own return temperature detector connected
The zone controller with its own return temperature sensor (plant type 1 - x) passes the return temperature to the other zone controllers in the same segment.
These can thus ensure minimum limitation of the return temperature locally, depending on the settings made, which means that they generate a critical locking signal
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Purpose
Generation of maximum limit value
13 Function block: District heat
Together with function block "Actuator heating circuit", this function block provides control of the flow temperature in plants with an indirect (heat exchanger) or direct district heat connection.
It acts as a flow temperature controller for weather-compensated control of space heating with a district heat connection (plant type 2 - 0).
If the settings of this function block have been locked (on operating line 248; refer to the respective section), the display shows when and .
13.1 Operating lines
Line Function, parameter
112 Slope, maximum limitation return temperature
113 Start of compensation (point of inflection), maximum limitation return temperature
114 Integral action time, maximum limitation return temperature
13.2 Limitations
Factory setting (range) Unit
0.7 (0.0...4.0)
10 ( 50...50) °C
30 (0...60) min
13.2.1 Maximum limitation of primary return temperature
For the primary return temperature, maximum limitation is available to …
prevent too hot water from being fed back to the district heat network,
minimize piping losses of the district heat utility,
comply with the regulations of the utility.
T
PR
90
80
70
60
50
T
L constant s
40
30
T
L start
20
T
A
30 20 10 0 -10 s
T
A
Slope of limitation (operating line 112)
Outside temperature
T
L constant
Constant value of limitation (operating line 101)
T
T
L start
PR
Start of shifting limitation (operating line 113)
Primary return temperature
The maximum limit value is generated from the following variables:
Constant value (setting on operating line 101)
Slope (setting on operating line 112)
Start of compensation (setting on operating line 113)
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Function
Integral action time
The current limit value can be determined as follows:
If the outside temperature is higher than or equal to the value set for the start of compensation (setting on operating line 113), the current limit value is the constant value entered on operating line 101
If the outside temperature lies below the value set for the start of compensation, the current limit value T
L is calculated according to the following formula:
T
L
[°C] = T
L constant
+ [ ( T
L start
T
A
)
*
s ]
The outside temperature is the compensating variable used for maximum limitation of the primary return temperature; it can be acquired from the local sensor or via
LPB.
Limitation operates according to the selected characteristic:
When the outside temperature falls, the return temperature is initially limited to the constant value
If the outside temperature continues to fall, it reaches the set starting point for shifting compensation. From this point, the limit value is raised as the outside temperature falls; the slope of this section of the characteristic can be adjusted
Maximum limitation of the return temperature takes priority over minimum limitation of the flow temperature.
This function can be deactivated via operating line 101.
If the return temperature is limited, the display shows .
With maximum limitation of the return temperature, the integral action time determines the rate at which the flow temperature setpoint is reduced.
Short integral action times lead to faster reductions
Long integral action times lead to slower reductions
With this setting, the impact of the limiting function can be matched to the type of plant.
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Caution!
14 Function block: D.h.w.
This function block is used for making all d.h.w.-related settings.
14.1 Operating lines
Line Function, parameter
121* Assignment of d.h.w.
123 Release of d.h.w. heating
124 D.h.w. priority
126 D.h.w. storage tank sensor/thermostat
127 Boost d.h.w. charging temperature
128 Switching differential d.h.w.
129 Maximum time d.h.w. charging
130 Setpoint legionella function
131 Forced charging
* Operating line 121 is only available with RVP350
Factory setting (range)
0 (0...2)
2 (0...2)
0 (0...4)
0 (0…5)
10 (0...50)
8 (1...20)
60 (--- / 5...250)
--- (--- / 20...100)
0 (0 / 1)
14.2 Assignment of d.h.w. heating
Operating line 121 is used to select the heating circuits for which d.h.w. is heated, that is, the heating circuits that draw their water from the same source.
Op. line 121 Comments
0
1
D.h.w. heating only for heating circuit of own controller
D.h.w. is only provided for the heating circuits of the controllers
with the same segment number connected to the data bus (LPB)
2 D.h.w. is provided for all heating circuits of the controllers connected to the data bus (LPB)
The setting is required in connection with operating lines 141 (program for the circulating pump) and 123 (release of d.h.w. heating).
14.3 Program for the circulating pump
Unit
K
K min
°C
Refer to chapter 15.2.4 "Circulating pump"
14.4 Frost protection for d.h.w.
Frost protection for the controller’s d.h.w storage tank is ensured by sensor B31 and – if installed – sensor B32.
For the storage tank, a minimum switch-on temperature of 5 °C always applies. If the temperature acquired by sensor B31 or B32 falls below 5 °C, charging is immediately started (independent of other settings), generating a heat request to the precontroller. The switch-off temperature is 5 °C plus the switching differential (set on operating line 128).
When using thermostats, frost protection for the d.h.w. storage tank is not
provided.
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14.5 Release of d.h.w. heating
14.5.1 Function
Operating line 123 is used to select the times at which d.h.w. heating shall be released. Released means that the storage tank is recharged whenever there is a need.
When using this function, d.h.w. heating can be prevented during nonoccupancy times (e.g. at night or during holiday periods).
If, in the summer, d.h.w. charging takes place in alternating mode with an electric immersion heater, the latter is continuously released (24 hours a day) – independent of the setting made on operating line 123.
Mechanism of d.h.w. release:
1
2
3
4
D.h.w. button
Type of charging (via heating system/electric immersion heater)
D.h.w. heating via heating system
D.h.w. heating via electric immersion heater
14.5.2 Release programs
Release of d.h.w. heating takes place at the following times, depending on the setting made on operating line 123:
Setting D.h.w. heating is released …
0
1 continuously (24 hours a day) according to one or several heating programs
2 according to scheduler program 2 of own controller
With setting 1, release of d.h.w heating depends on the setting made on operating line 121. In the case of several heating programs, d.h.w. heating is released if at least one of the controllers involved provides heating to the NORMAL temperature according to its heating program (independent of operating mode) and does not operate in holiday mode.
Release of d.h.w. heating is shifted forward by 1 hour against the times of the heating program. When optimized switching on is active, the optimized switch-on times apply – and not the times entered.
The release of d.h.w. heating is explained on the basis of 2 examples, where controllers A, B, C, and D are interconnected via data bus.
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Example 1
Example 2
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Op. line
121
2
Op. line
123
Controller
A
1
B
C
D
Oper.
mode
Heating program,
optimization, holidays
06:00...18:00, no optimization
07:00...23:00
07:00...22:00, optimized switching on produces a forward shift of 2 hours
03:00...22:00, holidays
Release
D.h.w. heating is released from
04:00 to 23:00
Op. line
121
2
Op. line
123
1
Controller
A
B
Oper.
mode
Heating program,
optimization, holidays
06:00...18:00, no optimization
08:00...23:00
C 07:00...22:00, optimized switching on produces a forward shift of 2 hours
05:00...21:00 D
14.5.3 D.h.w. heating during holiday periods
Release
D.h.w. heating is released from
04:00 to 23:00
In holiday mode, d.h.w. heating is provided as follows:
Op. line
121
0
1
2
Op. line
123
D.h.w. heating
0, 1 or 2 No d.h.w. heating when own controller operates in holiday mode
0, 1 or 2 No d.h.w. heating when all controllers in the same segment operate in holiday mode
0, 1 or 2 No d.h.w. heating when all controllers in the interconnected system operate in holiday mode
14.6 Priority and flow temperature setpoint
14.6.1 Settings
Op. line
124
0
1
2
3
4
D.h.w. priority Flow temperature
setpoint according to …
Absolute
Shifting
Shifting d.h.w. d.h.w. maximum selection
None (parallel) d.h.w.
None (parallel) maximum selection
14.6.2 D.h.w. priority
Depending on the capacity of the heat source, it may be practical to throttle the amount of heat drawn by the heating circuit(s) during d.h.w. heating, thus accelerating the charging process. In that case, d.h.w. heating is given priority to space heating.
For that purpose, the controller offers 3 kinds of d.h.w. priority:
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Absolute priority
Shifting priority
No priority (parallel operation)
Priority is accomplished by delivering locking signals. The impact of the locking
signals is described in chapter 17.4.6 "Locking signal gain".
14.6.3 Absolute priority
During d.h.w. charging, the heating circuits are locked, which means that they cannot draw any heat.
Controller without bus connection:
During d.h.w. charging, the controller sends an uncritical locking signal of 100% to its own heating circuit
Controller with bus connection (not possible with RVP351):
During d.h.w. charging, the controller informs the consumer master that it presently effects d.h.w. charging with absolute priority. The consumer master is the device having the same segment number as the controller with device number 1.
The consumer master then sends an uncritical locking signal of 100% to all controllers in the same segment. If the consumer master is located in segment 0, the uncritical locking signal is sent to all controllers in all segments
14.6.4 Shifting priority
During d.h.w. charging, the heating circuits are throttled if the heat source (the boiler) is not able to maintain the required setpoint. In that case, the boiler controller’s display shows .
Controller without bus connection:
If, during d.h.w. charging with shifting priority, the boiler is not able to maintain its setpoint, the differential of setpoint and actual value is integrated and an integral-dependent uncritical locking signal in the range of 0…100% is sent to the controller’s own heating circuit.
Since shifting priority is determined by the boiler, this kind of priority is only possible with plant type 3 - x. With plant types 1 - x and 2 - x, setting "Shifting priority" has the same impact as setting "No priority"
Controller with bus connection (not possible with RVP351):
During d.h.w. charging, the controller informs the heat source in the same segment that it currently effects d.h.w. charging with shifting priority. If, now, the boiler is not able to maintain its setpoint, the differential of setpoint and actual value is integrated and an integral-dependent uncritical locking signal in the range of 0…100% is generated. If the heat source is located in segment 0, it sends the signal to all controllers in all segments. If the heat source is located in segment 1…14, it only sends the signal to the controllers in the same segment
14.6.5 No priority
No priority means parallel operation. D.h.w. charging has no impact on the heating circuits.
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Example
Example
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14.6.6 Flow temperature setpoint
With "Shifting priority" and "No priority", the temperature setpoint for the common flow, which is used for d.h.w. charging and space heating, can be generated in 2 different ways:
Flow temperature setpoint according to maximum selection
Flow temperature setpoint according to d.h.w. request
With plant types 1 - x and 2 - x, the temperature setpoint for the common flow is forwarded to the precontroller via data bus.
With plant type 3 - x, the temperature setpoint for the common flow is valid for sensor B2.
14.6.7 Maximum selection
With d.h.w. heating, the temperature setpoint for the common flow – which is used for both the d.h.w. and the heating circuit – is generated via maximum selection, based on the 2 heat requests.
The mixing heating circuit calls for 40 °C, the d.h.w. circuit for 65 °C. With d.h.w. charging, the setpoint for the common flow temperature will then be the higher of the 2, namely 65 °C.
14.6.8 D.h.w.
With d.h.w. heating, the temperature setpoint for the common flow used for d.h.w. and the heating circuit will then be that demanded by the d.h.w. circuit.
The mixing heating circuit calls for 80 °C, the d.h.w. circuit for 65 °C. With d.h.w. heating, the temperature setpoint for the common flow will then be that demanded by the d.h.w. circuit, namely 65 °C.
14.7 Type of d.h.w. charging
Refer to chapter 15 "Function block: Multifunctional relays".
14.8 D.h.w. storage tank sensor/thermostat
The way the d.h.w. storage tank temperature is acquired must be selected on operating line 126. It can be captured with 1 or 2 sensors, or with 1 or 2 thermostats.
In the case of plants without solar d.h.w. heating, settings 0 to 3 are available; with solar d.h.w. heating, setting 4 or 5:
Setting Type of charging
0 D.h.w. charging with 1 sensor
1
2
3
4
D.h.w. charging with 2 sensors
D.h.w. charging with 1 thermostat
D.h.w. charging with 2 thermostats
Solar d.h.w. charging with 1 sensor *
5 Solar d.h.w. charging with 2 sensors *
* The settings for solar d.h.w. charging are to be made on operating lines 201 - 208
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Note
The switch-on and switch-off temperatures for charging via sensors are calculated as follows:
SD
BW
ON
OFF
T
ON
T
OFF
= T
BWw
T
BWx
ON D.h.w. charging ON
OFF D.h.w charging OFF
SD
BW
Switching differential of d.h.w. charging (operating line 128)
T
ON
Switch-on temperature
T
OFF
Switch-off temperature
T
BWw
NORMAL or REDUCED setpoint of d.h.w. temperature (operating line 26 or 28)
T
BWx
D.h.w. temperature (operating line 27)
T
BWx1
Measured value storage tank sensor 1 (B31)
T
BWx2
Measured value storage tank sensor 2 (B32)
Fixing the switch-on temperature (start of d.h.w. charging):
Op. line
126
Acquisition Switching criterion
2 1 thermostat
T
BWx1
< (T
BWw
– SD
BW
)
T
BWx1
< (T
BWw
– SD
BW
) and T
BWx2
< (T
BWw
– SD
BW
)
Thermostat contact B31 closed
3 2 thermostats Thermostat contacts B31 and B32 closed
4 Solar via 1 sensor T
BWx1
< (T
BWw
– SD
BW
)
5 Solar via 2 sensors T
BWx1
< (T
BWw
– SD
BW
) and T
BWx2
< (T
BWw
– SD
BW
)
Fixing the switch-off temperature (end of d.h.w. charging):
Op. line
126
Acquisition Switching criterion
T
BWx1
> T
BWw
T
BWx1
> T
BWw
and T
BWx2
> T
BWw
2 1 thermostat
3 2 thermostats
Thermostat contact B31 open
Thermostat contacts B31 and B32 open
4 Solar with 1 sensor T
BWx1
> T
BWw
5 Solar with 2 sensors T
BWx1
> T
BWw
and T
BWx2
> T
BWw
From the 2 tables above, it is apparent that when using 2 sensors, it is of no importance which is fitted at the top and which at the bottom of the storage tank.
If the storage tank is equipped with a thermostat, it is the thermostat that determines the switch-on/off temperature.
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14.9 Boost of d.h.w. charging temperature
Operating line 127 can be used to set the boost of the d.h.w. charging temperature in Kelvin. The boost refers to the d.h.w. temperature setpoint.
The lower the boost setting, the longer d.h.w. charging takes.
T
Lw
[°C] = T
BWw
+ T
BW
Example:
D.h.w. temperature setpoint (T
BWw
, operating line 26) = 50 °C
Boost of charging temperature (T
BW
, operating line 127) = 10 K
Resulting charging temperature setpoint T
Lw
= 60 °C
If a thermostat is used, the boost of the d.h.w. charging temperature must nevertheless be set.
14.10 Maximum d.h.w. charging time
Operating line 129 can be used to set the maximum charging time for d.h.w. storage tanks. The function is always active, independent of the kind of d.h.w. priority
(absolute, shifting, or parallel).
When d.h.w. charging is started, a counter records the charging time. If charging is ended before the set maximum charging time has elapsed, the counter is reset to zero. A new charging cycle can be started any time.
But if charging takes longer than the set maximum time, it is aborted and then locked for the same period of time. Then, charging is resumed, either until the setpoint is reached or until maximum limitation aborts again the charging time.
The function can be deactivated; in that case, the charging time is not limited.
T
BW
T
BWw
T
BWw
- SD
BW t
B
WL
ON
OFF
B
WL
Charging locked
D.h.w. charging
ON D.h.w. charging ON
OFF D.h.w charging OFF t Time t
Lmax t
Lmax t
Lmax
Maximum charging time
T
BW
D. h.w. temperature
T
BWw
SD
BW
D.h.w. temperature setpoint
Switching differential d.h.w. t
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With storage tank sensor
With thermostat
Flow temperature
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14.11 Setpoint for legionella function
Operating line 130 can be used to adjust the setpoint for the legionella function or to deactivate the function (setting ---).
For a description of the legionella function and related settings, refer to chapter 16
"Function block: Legionella function".
14.12 Forced charging
Operating line 131 can be used to select whether or not forced charging of the storage tank shall take place every day when d.h.w. heating is released for the first time.
With forced charging, the storage tank is also charged when the d.h.w. temperature lies between the switch-on and switch-off temperature. The switch-off point remains the same.
If d.h.w. heating is released for 24 hours a day, forced charging takes place very day at midnight.
14.13 Protection against discharging
14.13.1 Purpose
With plant types that use a d.h.w. storage tank, protection against discharging is ensured during overrun of the d.h.w. charging pump.
This function makes certain that the d.h.w. does not cool down during the time pump overrun is performed.
14.13.2 Mode of operation
If the flow temperature lies below the storage tank temperature, pump overrun is ended prematurely.
The flow temperature is acquired with sensor B2 or obtained via data bus (LPB) as the common flow temperature, depending on the type of plant.
If the flow temperature lies below the d.h.w. temperature setpoint, pump overrun is ended prematurely.
The flow temperature is acquired with sensor B2 or obtained via data bus (LPB) as the common flow temperature, depending on the type of plant.
The flow temperature is ascertained as follows, depending on the type of plant and the bus connection:
Plant type Controller without bus
connection (LPB)
1–1 Since no flow temperature is available, there is no pump overrun due to protection against discharging
3–1 Sensor B2
* Not possible with RVP351 (no LPB)
Controller with bus
connection (LPB)
Common flow temperature of the same segment via data bus.*
Otherwise, there is no pump overrun due to protection against discharging
Sensor B2
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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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Note
For multifunctional relay K6
For multifunctional relay K7
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15 Function block: Multifunctional relays
The RVP3.. controllers are equipped with up to 2 multifunctional relays K6 and K7 whose functions are selected with this function block. These relays are also used for the control of a circulating pump, a collector pump, or an electric immersion heater for d.h.w. heating. The multifunctional relays can be parameterized independently.
False configurations are not prevented!
15.1 Operating lines
Line Function, parameter
141 Function multifunctional relay K6
142 Function multifunctional relay K7
Factory setting (range)
0 (depending on type of controller)
0 (depending on type of controller)
Unit
The following setting ranges are available, depending on the type of controller, the selected type of plant, and the selected multifunctional relay:
Controller type
RVP340
RVP350
RVP351
Controller type
RVP350
RVP351
Plant type x - 0 x - 0 x - 1 x - 0 x - 1
Plant type x - 1 x - 1
Setting range
0..2
0..2
0..9
0..2
0..7
Setting range
0..4
0..2
15.2 Functions of multifunctional relays K6/K7
The multifunctional relays can be assigned the following functions:
Operating line Function
141 (K6) 142 (K7)
0
1
2
3
4
0
-
-
-
-
No function
Relay energized in the event of fault
Relay energized when there is demand for heat
Circulating pump continuously ON (24 hours a day)
5
6
7
-
1
2
Circulating pump ON according to heating program(s)
(depending on the setting made on operating line 121)
Circulating pump ON according to scheduler program 2
Collector pump
Switching over d.h.w. heating ”Heating/electric” according to own controller
8* 3* Switching over d.h.w. heating ”Heating/electric” according to all controllers having the same segment number in the interconnected system
9* 4* Switching over d.h.w. heating ”Heating/electric” according
* Not possible with RVP351 to all controllers in the interconnected system
In the case of plant types without d.h.w. heating (x - 0), the only settings that can be made are the following:
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General mode of operation
”Relay energized in the event of fault”
”Relay energized when there is demand for heat”
15.2.1 No function
The multifunctional relay is not assigned any function.
15.2.2 Relay energized in the event of fault
If the controller receives an error message from itself or via data bus (LCD shows
Er), the multifunctional relay is energized. This takes place with a delay of 2 minutes. When the error is corrected, that is, when the error message is no longer present, the relay is deenergized with no delay.
15.2.3 Relay energized when there is heat demand
If the controller’s own heating circuit or the d.h.w. circuit calls for heat, the multifunctional relay is energized.
In interconnected plants, the relay is also energized when the controller receives a demand for heat from the system.
15.2.4 Circulating pump
Operating line 141 can be used to enter the scheduler program according to which the d.h.w. circulating pump shall operate. The use of a circulating pump is optional with all types of plant.
The circulating pump runs only when d.h.w. heating is on (button is lit).
The circulating pump runs at the following times, depending on the setting made on operating line 141:
Op. line 141 Circulating pump runs …
3
4 continuously (24 hours a day) according to one or several heating programs
5 according to scheduler program 2 of own controller
With setting 4, operation of the circulating pump depends on the setting made on operating line 121 (provided the controller has communication capability and operates in an interconnected plant). In an interconnected plant with several controllers, that is, with several heating programs, the circulating pump runs when at least one of the controllers involved provides heating to the NORMAL temperature according to its heating program (independent of operating mode) and does not operate in holiday mode.
The circulating pump operates with a forward shift against the times of the heating program; this means that optimized switching on has an impact.
The behavior of the circulating pump is shown on the basis of 2 examples where controllers A, B, C, and D are interconnected via data bus (not possible with
RVP351):
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Example 1
Example 2
Operation of circulating pump during holiday periods
Note
Op. line
121
2
Op. line
141
4
Con-
troller
A
B
C
D
Operating
mode
Heating program,
holidays
06:00...18:00
07:00...23:00
07:00...22:00
03:00...22:00, holidays
Circulating
pump
Circulating pump runs from
06:00 to 23:00
Op. line
121
Op. line
141
Con-
troller
Operating
mode
Heating program,
holidays
Circulating
pump
06:00...18:00, optimized switching on produces a forward shift of 2 hours
Circulating pump runs from
4:00 to 23:00
B
C
08:00...23:00
D
07:00...22:00
05:00...21:00
In holiday mode, the circulating pump runs according to the setting made, as shown in the following table:
Op. line
121
0
1
2
Op. line
141
Operation of circulating pump
3, 4 or 5 Circulating pump OFF when own controller operates in holiday mode
3, 4 or 5 Circulating pump OFF when all controllers in the same segment operate in holiday mode
3, 4 or 5 Circulating pump OFF when all controllers in the interconnected system operate in holiday mode
15.2.5 Collector pump
The multifunctional relay is used to control the collector pump.
Activation of the collector pump is dependent on the temperatures acquired in the storage tank and the collector.
Op. line
141 142
Function
6 1 Collector pump
The storage tank sensor(s) used is (are) selected via operating line 126.
The settings required for solar d.h.w. charging must be made via operating lines
201 – 208.
15.2.6 Type of d.h.w. charging
The type of d.h.w. charging must be entered on operating line 141 or 142.
Basically, 2 choices are available:
Charging via the heating system, or
Charging in alternating mode via the heating system or with the electric immersion heater.
The setting has no impact on solar d.h.w. charging.
This is put into operation, independently of this setting, provided the respective switch-on criteria are satisfied.
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Charging via the heating system
Charging in alternating mode
The setting to be made on operating line 141 is 0...5, and the setting on operating line 142 is 0 or 1.
The d.h.w. storage tank is charged via the heating system throughout the year.
The setting to be made on operating line 141 is 7, 8 or 9, or on operating line 142 it is 2, 3 or 4.
In the winter, the d.h.w. storage tank is charged via the heating system, and in the summer with the electric immersion heater.
Switching over takes place according to the following criteria:
Switching from charging via the heating system to the electric immersion heater takes place when there is no demand for space heating for at least 48 hours
(switching over at midnight)
Switching from the electric immersion heater to charging via the heating system is effected when there is heat request from space heating. Depending on the setting made on operating line 141 (7, 8 or 9), different types of heat requests are considered for the switchover criterion:
Op. line
141 142
Function
7 2 Heat request from the controller’s own heating circuit
8* 3* Heat requests from all controllers having the same segment
number and being connected to the data bus (LPB), including those from the controller’s own heating circuit
9* 4* Heat requests from all controllers connected to the data bus
(LPB), including those from the controller’s own heating circuit
* Not possible with RVP351
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16 Function block: Legionella function
When using d.h.w. heating systems with storage tanks, the legionella function prevents excessive concentrations of legionella viruses. The function ensures periodic heating up of the d.h.w. to a sufficiently high temperature level for a certain dwelling time.
16.1 Operating lines
Line Function, parameter
147 Periodicity of legionella function
148 Starting point legionella function
149 Dwelling time at legionella setpoint
150 Circulating pump operates during the legionella function
16.1.1 Setpoint/switching on/off
Factory setting (range)
1 (0…7)
05:00 (00:00…23:50)
30 (0…360)
1 (0 / 1)
Unit
- hh:mm min
-
"Setpoint legionella function" is to be adjusted via function block "D.h.w." on operating line 130. Setting --- deactivates the legionella function.
16.1.2 Periodicity of legionella function
Operating line 147 can be used to select the periodicity of the legionella function:
When using setting 0, the d.h.w. temperature is raised to the legionella setpoint on a daily basis
When using setting 1 to 7, the d.h.w. temperature is raised to the legionella setpoint on a weekly basis. Setting 1 raises the d.h.w. temperature every Monday, setting 2 every Tuesday, etc.
16.1.3 Starting point
The time of day the legionella function shall be started can be set on operating line
148.
16.1.4 Dwelling time at legionella setpoint
Operating line 149 is used to define for what period of time the actual value of the d.h.w. temperature must lie above the legionella setpoint (operating line130) for the function to be considered fulfilled.
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16.1.5 Operation of circulating pump
Operating line 150 is used to select whether the legionella function shall act on the d.h.w. circulating pump:
With setting 0, the legionella function does not act on the circulating pump.
With setting 1, the legionella function acts on the circulating pump.
16.2 Mode of operation
Preconditions for the legionella function:
The storage tank temperature is acquired with sensor(s) (legionella function not possible with thermostats)
The legionella function was activated by defining a setpoint (operating line 130).
D.h.w. heating is on (button lit)
Holiday function and operating mode changeover via contact H1 are not active
Charging is effected via the heating system and not with the electric immersion heater
If the criteria of periodicity and starting time are fulfilled, the legionella function is released. Release of the legionella function means that the d.h.w. temperature setpoint is raised to the level of the legionella setpoint and that forced charging is triggered.
If d.h.w. heating is off, or the holiday function or operating mode changeover is active, the legionella function is released, but not the setpoint boost. On completion of the overriding function, d.h.w. charging to the legionella setpoint is started since release of the legionella function is maintained.
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The following graph shows the behavior of the legionella function as a function of the d.h.w. temperature:
T
BWx
ON
OFF
ON
OFF
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.
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17 Function block: Service functions and general settings
This function block is used to combine various displays and setting functions that are of assistance in connection with commissioning and service work. In addition, a number of extra functions are performed.
The number of available operating lines and settings depend on the type of controller used.
17.1 Operating lines
Line Function, parameter
161 Simulation of outside temperature
162 Relay test
164 Display of setpoint
167 Outside temperature for frost protection for the plant
168 Flow temperature setpoint for frost protection for the plant
169* Device number
170* Segment number
172 Operating mode when terminals H1–M are bridged
173 Locking signal gain
174 Pump overrun time
175 Pump kick
176 Changeover winter-/summertime
177 Changeover summer-/wintertime
178* Clock mode
179* Bus power supply, operating mode and status indication
180* Outside temperature source
194 Hours run counter
195 Software version
* Not available with RVP351
17.2 Display functions
Factory setting (range) Unit
--.- (--.- / 50...50) °C
RVP340: 0 (0...5)
RVP35..: 0 (0...10)
Display function
2.0 (--.- / 0...25)
15 (0...140)
°C
°C
0 (0...16)
0 (0...14)
Plant type x - 0: 0 (0...3)
Plant type x - 1: 0 (0...9)
100 (0...200)
6 (0...40)
0 (0/1)
25.03 (01.01. ... 31.12)
% min
25.10 (01.01. ... 31.12)
0 (0...3)
A (0 / 1 / A)
A (A / 00.01... 14.16)
Display function
Display function
17.2.1 Hours run counter
The number of controller operating hours are displayed. The controller counts the hours whenever operating voltage is present.
The reading is limited to a maximum of 500,000 hours (57 years).
17.2.2 Software version
The display shows the software version currently used by the controller.
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17.3 Commissioning aids
17.3.1 Simulation of outside temperature
To facilitate commissioning and fault tracing, outside temperatures in the range from 50 to 50 °C can be simulated. Simulation has an impact on the current, the composite and the attenuated outside temperature.
Simulated T
A
= current T
A
= composite T
A
= attenuated T
A
During the simulation, the current outside temperature (as acquired by the sensor or via LPB) is overridden.
When simulation is completed, the current outside temperature gradually readjusts the composite and the attenuated outside temperature to their correct values.
Hence, simulation of the outside temperature leads to a reset of the attenuated and the composite outside temperature.
Simulation can be ended in one of 3 different ways:
By entering --.-
By leaving the setting level by pressing any of the operating mode buttons
Automatically after 30 minutes
17.3.2 Relay test
The output relays can be individually energized. The following codings apply, depending on the type of controller and type of plant:
RVP340:
Input
0
1
2
3
4
5
RVP35..
Input
3
4
5
0
1
2
Relay test
Normal operation (no test)
All relays deenergized
Actuator heating circuit OPEN
Actuator heating circuit CLOSE
Heating circuit pump ON
Multifunctional relay K6 energized
Relay
Relay test
Normal operation (no test)
All relays deenergized
Burner stage 1 ON
Burner stages 1 and 2 ON
Heating circuit pump ON
Storage tank charging pump ON
6
7
8
Actuator heating circuit OPEN
Actuator heating circuit CLOSE
Heating circuit pump ON
9 Multifunctional relay K7 energized
10 Multifunctional relay K6 energized
The relay test can be ended in one of 4 different ways:
–
–
Y1
Y2
Q2
K6
Relay
–
–
K4
K4 and K5
Q1
Q3
Y1
Y2
Q2
K7
K6
By entering 0 on the operating line
By leaving the setting level by pressing or
By leaving the setting level by pressing any of the operating mode buttons
Automatically after 30 minutes
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17.3.3 Sensor test
Operating line 163 can be used to check the connected sensors; if available, the current setpoints and limit values are displayed on operating line 164.
The 8 temperatures can be queried by entering 0...8:
Input
0
Op. line 163 (actual values)
Actual value of outside sensor at terminal B9.
If the outside temperature is obtained via data bus, the display shows ---
Actual value of flow temperature sensor at terminal B1
Op. line 164 (setpoints)
No display
1 Flow temperature setpoint.
If there is no heat request, the display shows ---
Room temperature setpoint 2
3
4
Actual value of room temperature sensor at terminal B5
Actual value of room unit at terminal A6
Actual value of return sensor at terminal B7.
If the return temperature is obtained via data bus, the display shows ---
Room temperature setpoint
Limit value of return temperature.
If there is no return temperature limitation, the display shows ---
5*
6*
7*
Actual value of storage tank sensor at terminal B31
Actual value of storage tank sensor at terminal B32
Actual value of collector sensor at terminal B6
D.h.w. temperature setpoint
D.h.w. temperature setpoint
Setpoint of collector sensor (corresponds to actual value of storage tank sensor B32 plus temperature differential solar ON on operating line 201)
8* Actual value of boiler sensor at terminal B2
Boiler temperature setpoint
(switch-off point).
If there is no heat request, the display shows ---
* Not available with RVP340
Errors in the measuring circuits are displayed as follows:
= short-circuit (thermostat: contact closed)
– – – = interruption (thermostat: contact open)
When changing from operating line 163 to 164, or vice versa, the selected sensor
(setting 0…8) is maintained.
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17.4 Auxiliary functions
17.4.1 Frost protection for the plant
The plant can be protected against frost. Precondition is that controller and heat source are ready to operate (mains voltage present!).
The following settings are required:
Outside temperature at which frost protection shall respond
Minimum flow temperature to be maintained by the frost protection function
ON
0,5 °C 0,5 °C
BZ167
T
A
OFF
ON
Operating line 167
Outside temperature
Frost protection OFF
Frost protection ON
OFF
BZ 167 T
A
If the current outside temperature falls below the limit value (setting on operating line 167 minus 0.5 °C), the controller switches heating circuit pump M2 on and maintains the flow temperature at the setpoint selected for frost protection (operating line 168).
An appropriate heat request is sent to the heat source.
The control is switched off when the outside temperature exceeds the limit value by 0.5 °C.
Frost protection for the plant can be deactivated (setting --.- on operating line 167).
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17.4.2 Manual overriding of operating mode (contact H1)
Using a simple remote control, the operating mode of the heating circuit and that of d.h.w. can be overridden. This is accomplished by bridging terminals H1 M.
The operating mode that shall rule when H1 M are bridged can be selected on operating line 172:
Setting
0
1
Operating mode of
heating circuit
Protection mode
AUTO
Operating mode of
d.h.w. circuit
OFF
OFF
2
3
4
5
REDUCED
NORMAL
Protection mode
AUTO
OFF
OFF
ON
ON
6
7
REDUCED
NORMAL
ON
ON
8 AUTO ON (24 hours a day)
9 NORMAL ON (24 hours a day)
In the case of controllers without d.h.w. heating (plant types x - 0), 0…3 are the only possible settings.
As long as this function is active, the LED of the respective operating mode button flashes at a low frequency (approx. 0.5 Hz). The buttons themselves are inoperable however.
When the function is deactivated, the controller resumes the previously selected operating mode.
17.4.3 Pump overrun
To prevent heat from building up, a common pump overrun time can be set on operating line 174 for all pumps associated with the controller (with the exception of the circulating pump). So, upon deactivation, the pumps continue to run for the set overrun time.
D.h.w. discharging protection has priority over the pump overrun function.
In interconnected plants, the set time also affects the forced signals that a boiler can deliver to ensure overtemperature protection.
For more detailed information, refer to chapter 11.4.5 "Protection against boiler overtemperatures".
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Example
Basics
Uncritical locking signals
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17.4.4 Pump kick
To prevent pump seizing during longer off periods (e.g. in the summer), a periodic pump kick can be activated on operating line 175. The input is either 0 or 1:
0 = no periodic pump kick
1 = weekly pump kick
If the pump kick is activated, all pumps run for 30 seconds, one after the other, every Friday morning at 10:00, independent of all other functions and settings.
17.4.5 Winter-/summertime changeover
Changeover from wintertime to summertime, and vice versa, takes place automatically. If international regulations change, the dates need to be reentered. The date to be entered is the earliest possible changeover date. Changeover always takes place on a Sunday.
If the start of summertime is specified as the "Last Sunday in March", the earliest possible changeover date is March 25. Then, the date to be entered on operating line 176 is 25.03.
If no winter-/summertime changeover is required, the 2 dates must be set so that they coincide.
17.4.6 Locking signal gain
Functions "Maintained boiler return temperature", "Protective boiler startup" and
"D.h.w. priority" use locking signals that are forwarded to the heat exchangers and consumers. With the heat exchanger and consumer controllers, operating line 173
(locking signal gain) can be used to set how intensely these controllers shall respond to locking signals. The locking signal gain is adjustable from 0% to 200%.
Setting Response
0% Locking signal is ignored
100% Locking signal is adopted on a 1-to-1 basis
200% Locking signal is adopted as a double signal
There are 2 types of locking signals:
Uncritical locking signals
Critical locking signals
The response of the consumers depends on the type of load.
Uncritical locking signals are generated in connection with d.h.w. priority (absolute and shifting) and only act on the heating circuits.
The response of the heating circuit depends on the type of heating circuit:
Heating circuit with mixing valve/2-port valve:
In the heating circuit, the flow temperature setpoint is reduced as a function of the set locking signal gain. The mixing valve/2-port valve closes, the heating circuit pump continues to run
Heating circuit with pump:
When the uncritical locking signal reaches a defined value, the heating circuit pump is deactivated, independent of the set locking signal gain. In plants using a diverting valve, the valve is driven to the d.h.w. position
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Critical locking signals
Critical locking signals are generated by the boiler temperature controller during protective boiler startup and during minimum limitation of the boiler return temperature. If the boiler temperature controller is located in segment 0, the critical locking signal is sent to all consumers and heat exchangers in the bus network and – if present – to its own heating and d.h.w. circuit. If the boiler temperature controller is located in segment 1…14, it only delivers the critical locking signal to all loads in the same segment and – if present – to its own heating and d.h.w. circuit.
Minimum limitation of the return temperature can also be ensured locally by a controller with plant type 1 - x. In that case, the critical locking signal only acts inside the controller and is only delivered to the controller’s own heating circuit and the d.h.w. circuit.
With regard to the response of the consumers and heat exchangers, there are 2 choices:
Heat exchangers and consumers with mixing valve/2-port valve:
The flow temperature setpoint is reduced as a function of the set locking signal gain. Heat exchangers and consumers close their mixing valve/2-port valve
Consumers with pump circuit:
When the critical locking signal reaches a defined value, the pump is deactivated, independent of the set locking signal gain. In plants using a diverting valve, the valve is driven to the heating circuit position
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17.5 Inputs for LPB (RVP340 and RVP350)
17.5.1 Source of time of day
Several sources are available for the time of day, depending on the master clock.
The source must be entered on the controller on operating line 178 (clock mode), using setting 0…3:
0 = autonomous clock in the controller
1 = time of day via bus; clock (slave) without remote readjustment
2 = time of day via bus; clock (slave) with remote readjustment
3 = time of day via bus; central clock (master)
The impact of the individual inputs is as follows:
Input Impact
0 Time of day on the controller can be readjusted
Time of day of controller is not matched to the system time
Diagram
1 Time of day on the controller cannot be readjusted
Time of day of controller is continuously and automatically matched to the system time
2 Time of day on the controller can be readjusted and, at the same time, readjusts the system time since the change is adopted by the master
Time of day on the controller is never-
3 theless automatically and continuously matched to the system time
Time of day on the controller can be readjusted and, at the same time, readjusts the system time
Time of day on the controller is used for the system t ch Manual readjustment of time of day on the controller t N Controller time t sys System time
Per system, only 1 controller may be used as a master. If several controllers are parameterized as masters, an error message is delivered (error code 100).
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17.5.2 Outside temperature source
If, in interconnected plants, the outside temperature is acquired via bus, the temperature source can be addressed either automatically or directly (operating line
180).
Addressing Display, input Comments
Automatically
A xx.yy
Display A (for automatically) and xx.yy (address of automatically selected source): xx = segment number, yy = device number)
Directly
xx.yy
Source address must be entered
If the controller operates autonomously (without bus), there is no display and inputs cannot be made.
If the controller is used in an interconnected plant and it has its own outside sensor, it is not possible to enter an address (if an entry is made, the display shows
OFF). In that case, the controller always acquires the outside temperature from its own sensor. The address displayed is the controller’s own.
For detailed information about addressing the source, refer to Data Sheet N2030.
17.5.3 Addressing the devices
Every device connected to the data bus (LPB) requires an address. This address is made up of a device number (1...16, operating line 169) and a segment number
(0...14, operating line 170).
In an interconnected plant, every address may be assigned only once. If this is not observed, the correct functioning of the entire connected plant cannot be ensured.
In that case, an error message is delivered (error code 82).
If the controller operates autonomously (without bus), the device number must be set to zero.
Since the device address is also associated with control processes, it is not possible to use all possible device addresses in all types of plant:
Plant type G = 0
S = any (no bus)
1 - x
2 - x
Permitted
Permitted
G = 1
S = 0
Permitted
Permitted
G = 1
S = 1...14
Permitted
Permitted
G = 2...16
S = any
Permitted
Permitted
3 - x Permitted
G = device number
Permitted Permitted Not permitted
S = segment number
If an inadmissible address has been entered for the selected plant type, an error message appears (error code 140).
For detailed information about addressing devices, refer to Data Sheet N2030.
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17.5.4 Bus power supply
In interconnected plants with a maximum of 16 controllers, bus power supply can be decentralized, that is, power can be supplied by each connected device. If a plant contains more than 16 devices, central bus power supply is mandatory.
In that case, it must be selected on every connected device whether the data bus is powered centrally or decentrally by the controllers.
With the controller, this setting is made on operating line 179. The display shows the selection made on the left and the current bus power supply state on the right.
Display Bus power supply
0
A
Central bus power supply is mandatory
(no power supply via controller)
Decentral bus power supply via controller
0 No bus power supply presently available
1 Bus power supply presently available
BUS appears on the display only when a bus address is valid and bus power supply is available. Hence, the display indicates whether or not data traffic via data bus is possible.
17.5.5 Bus loading number
The bus loading number E of the RVP3.. for the LPB is as follows:
RVP340 = 6
RVP350 = 7
RVP351 no LPB
The sum of all bus loading numbers E of all devices connected to the same bus must not exceed 300.
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18 Function block: Solar d.h.w.
18.1 Operating lines
This function block provides settings for the heating engineer.
Line Function, parameter
201 Temperature differential solar ON
202 Temperature differential solar OFF
203 Fost protection temperature for collector
204 Overtemperature protection for collector
205 Evaporation temperature of heat conducting medium
206 Maximum limitation of charging temperature
207 Maximum limitation storage tank temperature
208 Collector start function gradient
18.2 General
Factory setting (range)
8 (0…40)
4 (0…40)
--- (--- / –20…5)
105 (--- / 30…240)
140 (--- / 60…240)
80 (8…100)
90 (8…100)
--- (--- / 1…20)
In the case of plant types equipped with a d.h.w. storage tank, the RVP35.. supports solar d.h.w. heating.
The function is activated …
when function "D.h.w. storage tank sensor" (operating line 126, setting 4 "Solar d.h.w. heating with one sensor" or setting 5 "Solar d.h.w. heating with two sensors") is parameterized, and
when 1 of the 2 multifunctional relays K6 or K7 is parameterized for use with the collector pump (operating line 141, setting 6, or operating line 142, setting 1).
Then, solar d.h.w. charging is always released. It is performed via the collector pump based on the temperature differential of d.h.w storage tank and collector.
Solar charging control uses storage tank sensor B32 at the bottom.
If that sensor is not installed, storage tank sensor B31 at the top (if installed) is automatically used.
During the time the solar circuit charges the storage tank, the display shows .
Unit
K
K
°C
°C
°C
°C
°C min/K
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B31 Storage tank sensor 1
B32 Storage tank sensor 2
B6 Collector sensor
Kx Collector pump connected to K6 or K7
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18.3 Functions
18.3.1 Temperature differential ON/OFF solar
Operating lines 201 and 202 are used to set the temperature differential for switching solar d.h.w. charging on and off.
A certain temperature differential of collector and storage tank is required for charging; also, the collector must have reached the minimum charging temperature.
SD
ON
SD
OFF
TLmin
ON
OFF
TKol Collector temperature
ON/OFF Collector pump
SD
ON
Temperature differential ON
SD
OFF
Temperature differential OFF
TSp Storage tank temperature
TLmin Minimum charging temperature
T t
Temperature
Time
The storage tank is charged when the collector temperature exceeds the current storage tank temperature by the switch-on differential:
TKol > TSp + SD
ON
Storage tank charging is stopped when the collector temperature drops below the switch-off differential:
TKol < TSp + SD
OFF
18.3.2 Minimum charging temperature
The collector pump is only activated when the collector reaches a minimum temperature of 30 °C and when the required temperature differential is attained.
TLmin 30 °C
ON
OFF
TKol Collector temperature
ON/OFF Collector pump
SD
ON
Temperature differential ON
SD
OFF
Temperature differential OFF
Temperature
Time
TLmin Minimum charging temperature
T t
Charging is aborted when the collector temperature drops below the minimum charging temperature (even if the switch-on differential is reached):
TKol < TLmin
Charging is effected when the collector temperature exceeds the minimum charging temperature by the switching differential (SD
ON
– SD
OFF
) (and when the required switch-on differential is reached):
TKol > TLmin + (SD
ON
– SD
OFF
)
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Frost protection as a special case
18.3.3 Minimum running time
When the collector pump is activated, it keeps running for a minimum time of tMin
= 20 seconds. This minimum on time applies to all functions that activate the collector pump. tMin
fSolar
ON
OFF fSolar Solar function
ON/OFF Collector pump tMin Minimum on time
To ensure that the flow pipe from the collector to the storage tank is flushed with hot water, deactivation of the collector pump after reaching the frost protection limit at the collector sensor is delayed by the minimum running time. tMin
fFrost
ON
OFF fFROST Frost protection function solar
ON/OFF Collector pump tMin Minimum running time
18.3.4 Fost protection temperature for the collector
Operating line 203 is used to set the frost protection temperature for the collector.
If there is risk of frost at the collector, the collector pump is activated to prevent the heat conducting medium from freezing.
TKolFrost 1 K
ON
OFF
TKol Collector temperature
TKolFrost Frost protection temperature for collector
ON/OFF Collector pump
T Temperature t Time
The collector pump is activated when the collector temperature drops below the frost protection temperature: TKol < TKolFrost
The collector pump is deactivated when the collector temperature rises 1 K above the frost protection temperature: TKol > TKolFrost + 1 K
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The frost protection function is aborted when the d.h.w. storage tank temperature drops below 8 °C
Setting --- deactivates the frost protection function for the collector
18.3.5 Overtemperature protection for the collector
Operating line 204 is used to set the temperature that protects the collector against overheating.
If there is a risk of collector overtemperature, storage tank charging is continued beyond maximum limitation of the charging temperature (setting on operating line
206) until maximum limitation of the storage tank temperature is reached (setting on operating line 207), aimed at reducing the amount of surplus heat.
When maximum limitation of the storage tank temperature is reached, overtemperature protection for the collector is no longer possible, and the collector pump is deactivated.
5 K
1 K
ON
OFF
TSpSi Maximum limitation of storage tank temperature
TSp Storage tank temperature
TKolUe Overtemperature protection for collector
TSpMax Maximum limitation of charging temperature
TKol Collector temperature
ON/OFF Collector pump
T Temperature t Time
If the collector temperature exceeds the overtemperature protection level and maximum limitation of the storage tank temperature is not yet reached, the collector pump is activated: TKol > TKolUe and TSp < TSpSi.
If the collector temperature drops 5 K below the overtemperature protection level, the collector pump is deactivated: TKol < TKolUe – 5 K
If the storage tank temperature rises to the maximum limit value, the collector pump is deactivated:
TSp > TSpSi
If the storage tank temperature drops 1 K below maximum limitation of the d.h.w. storage tank temperature, the collector pump is activated again:
TSp < TSpSi – 1 K
If 2 storage tank sensors are used, the sensor acquiring the highest temperature is considered.
Setting --- deactivates overtemperature protection for the collector.
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18.3.6 Storage tank recooling
After overtemperature protection for the collector has been active, function "Storage tank recooling" discharges the d.h.w. storage tank to bring it down to a lower temperature level.
Storage tank recooling is effected via the collector’s surface. For that, the collector pump is activated, thus transferring heat from the storage tank to the collector to be emitted to the environment via the collector’s surface.
The recooling setpoint (TRk) is set to a fixed 80 °C. The switching differential for recooling (SD
ON
) corresponds to the value of the switch-on differential (operating line 201) of charging control, but is limited to a minimum of 3 K for recooling.
2 K
TRk
1 K
1 K
ON
OFF
SD
ON
Temperature differential ON
TRk Recooling setpoint
TSp Storage tank temperature
TKol Collector temperature t
ON / OFF Collector pump
T Temperature
Time
If the storage tank temperature lies at least 2 K above the recooling setpoint and by at least the temperature differential ON above the collector temperature, the collector pump is activated:
TSp > TRk + 2 K and TSp > TKol + SD
ON
If the collector temperature rises to a level of 2 K below the storage tank temperature, the collector pump is deactivated:
TKol > TSp – 2 K
If the storage tank temperature reaches a level of 1 K above the recooling setpoint, the function is ended:
TSp < TRk + 1 K
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18.3.7 Evaporation temperature of heat conducting medium
Operating line 205 is used to set the evaporation temperature of the heat conducting medium. If there is a risk of evaporation of the heat conducting medium (due to high collector temperatures), the collector pump is deactivated to prevent it from overheating. This is a pump protection function.
TVerd
15 K
ON
OFF
TVerd Evaporation temperature of heat conducting medium
TKol Collector temperature
ON/OFF Collector pump
T Temperature t Time
The collector pump is deactivated if the collector temperature exceeds the evaporation temperature:
TKol > TVerd
The collector pump is activated again when the collector temperature drops 15 K below the evaporation temperature:
TKol < TVerd – 15 K
Setting --- deactivates the pump protection function.
Evaporation protection of the heat conducting medium (pump off) has priority over overtemperature protection which would activate the pump.
18.3.8 Maximum limitation of charging temperature
Operating line 206 is used to set the maximum limitation for the charging temperature. When the maximum charging temperature in the storage tank is reached, the collector pump is deactivated.
1 K
ON
OFF
TSp Storage tank temperature T Temperature
TSpMax Maximum lim value of charging temperature t Time
ON/OFF Collector pump
Charging is aborted if the storage tank temperature exceeds the maximum limit value:
TSp > TSpMax
Charging is released again when the storage tank temperature drops 1 K below the maximum limit value:
TSp < TSpMax – 1 K
Overtemperature protection for the collector can again activate the collector pump until the storage tank temperature reaches its maximum limit value.
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Caution
18.3.9 Maximum limitation of storage tank temperature
Operating line 207 is used to set the maximum limitation of the storage tank temperature.
The storage tank is never charged to a level above the set maximum temperature
(refer to chapter 18.3.5 "Overtemperature protection for the collector").
Maximum limitation of the storage tank temperature is not a safety function!
18.3.10 Collector start function
The controller is supplied with the collector start function deactivated.
Since the temperature at the collector (especially in the case of vacuum pipes) cannot be reliably acquired when the pump is not running, the pump can be activated based on an adjustable gradient [min/K].
Operating line 208 is used to set the gradient for the collector start function.
The gradient corresponds to the temperature increase per minute when the collector is off:
Gradient = 1 [min/K]: Corresponding to a temperature increase of 1 [K/min]
Gradient = 20 [min/K]: Corresponding to a temperature increase of 1/20 [K/min]
If, within 1 minute, the temperature acquired by the collector sensor rises more than the set gradient, the pump is activated (minimum running time 20 seconds). If the required collector charging temperature is reached within the period of time the pump runs, solar d.h.w. charging is started and the pump remains activated.
If the collector temperature does not reach the required level, or drops again, the pump is again deactivated. The pump remains on for a maximum of 1 minute plus the minimum running time (20 seconds), if the solar charging function does not provide control of the pump
T
.
1 K
TKol t < Grad
ON
OFF
Setting --- deactivates the collector start function.
Grad Gradient t
T Temperature t Time
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19 Function block: Locking functions
All settings can be locked on the software side to prevent tampering.
19.1 Operating line
Line Function, parameter
248 Locking of settings
Factory setting (range)
RVP340: 0 (0...2)
RVP35..: 0 (0 / 1)
19.2 Locking settings on the software side
Unit
-
Operating line 248 can be used to lock on the software side the settings made on the controller. This means that the settings made can still be queried on the controller, but cannot be changed anymore. Locking can include:
All settings
Only the settings required in connection with the district heat parameters (only
RVP340)
The settings can be changed via bus (RVP340 and RVP350).
The procedure is as follows:
1. Press and simultaneously until appears on the display.
2. Press , , and , one after the other.
3. Now, operating line 248 appears on the display. The following locking choices are available:
0 = no locking
1 = all settings are locked
2 = only the settings required for the district heat are locked (operating lines 101 to 114)
After locking all settings, the following operating elements remain active:
The buttons for selecting the operating lines
No longer active are …
the buttons for making readjustments of values,
the knob for making readjustments of the room temperature,
the operating mode buttons (only for leaving the setting level),
the button for manual control.
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General
Overriding the heating circuit's operating mode
Knob for room temperature readjustments
20 Communication
20.1 Interplay with room units
20.1.1 General
The room temperature acquired by a room unit is fed to controller terminal A6. If the room temperature signal delivered by the room unit shall not be included in the control functions, the respective source must be selected (operating line 65). In that case, the other room unit functions are maintained.
The controller detects the connection of an inadmissible room unit and identifies it as an error for display on operating line 50 (error code 62)
Errors the room unit detects in itself are displayed by the controller on operating line 50 (error code 61)
20.1.2 Interplay with room unit QAW50
The QAW50 can act on the controller as follows:
Overriding the heating circuit’s operating mode
Readjustment of room temperature
For that purpose, the QAW50 has 3 operating elements:
Operating mode selector
Economy button (also termed presence button)
Knob for room temperature readjustments
From the QAW50, the operating mode of the heating circuit can be overridden.
This is accomplished via the operating mode selector and the economy button.
To enable the room unit to act on the controller, the latter must satisfy the following operating conditions:
Heating circuit operating mode AUTO
No holiday period active, no manual control
The operating mode selector of the QAW50 acts on the controller as follows:
Operating mode
of QAW50
Operating mode of heating circuit controller
; optional temporary overriding with economy button
Continuously NORMAL or continuously REDUCED heating, depending on the economy button
Protection mode
With the knob of the QAW50, the room temperature setpoint for NORMAL heating can be readjusted by ±3 °C.
The QAW50 does not affect adjustment of the room temperature setpoint on the controller’s operating line 1.
.
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Overriding the heating circuit's operating mode
Knob for room temperature readjustments
Overriding the
QAW70 inputs from the controller
20.1.3 Interplay with room unit QAW70
In combination with the QAW70, the following functions can be performed, or the room unit can act on the controller as follows:
Overriding the heating circuit's operating mode
Changing room temperature setpoints
Changing the d.h.w. temperature setpoint
Readjustment of room temperature
Input of time of day
Overriding the heating program
Display of the actual values acquired by the controller
For this purpose, the QAW70 has the following operating elements:
Operating mode button
Economy button (also termed presence button)
Knob for readjusting the room temperature
Buttons for selecting the operating lines
Buttons for readjusting values
From the QAW70, the heating circuit’s operating mode can be overridden. This is accomplished via the operating mode selector and the economy button.
To enable the room unit to act on the controller, the latter must satisfy the following operating conditions:
Heating circuit operating mode AUTO
No holiday period active, no manual control
The operating mode selector of the QAW70 acts on the controller as follows:
Operating mode
of QAW70
Operating mode of heating circuit controller
; optional temporary overriding with economy button
Continuously NORMAL or continuously REDUCED heating, depending on the economy button
Protection mode
With the knob of the QAW70, the room temperature setpoint for NORMAL heating can be readjusted by ±3 °C.
The QAW70 does not affect the adjustment of the room temperature setpoint on the controller's operating line 1.
If the controller with a connected QAW70 is isolated from the mains network and then reconnected, the following parameters on the QAW70 will be overwritten with the settings made on the controller:
Time of day and weekday
Complete heating program
Room temperature setpoint for NORMAL heating
Room temperature setpoint for REDUCED heating
D.h.w. temperature setpoint
Hence, the controller is always the data master.
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Impact of the individual
QAW70 operating lines on the controller
If 1 (slave without remote control) is entered on the controller’s operating line 178
("Source of time of day"), the time of day on the QAW70 cannot be readjusted.
Op. line
QAW70
1
Function, parameter Impact on controller, notes
2
3
4
5
6
7
8
Setpoint for NORMAL heating
Changes controller operating line 1
Setpoint for REDUCED heating
Weekday (entry of heating program)
Changes controller operating line 2
D.h.w. temperature setpoint Changes controller operating line 26 with plant types providing d.h.w. heating
Corresponds to controller operating line 4
Changes controller operating line 5 1st heating phase, start of
NORMAL heating
1st heating phase, end of
NORMAL heating
Changes controller operating line 6
Changes controller operating line 7 2nd heating phase, start of
NORMAL heating
2nd heating phase, end of
NORMAL heating
Changes controller operating line 8
9 3rd heating phase, start of
NORMAL heating
10 3rd heating phase, end of
NORMAL heating
Changes controller operating line 9
Changes controller operating line 10
11 Display of weekdays 1...7
Cannot be changed (refer to chapter 7.3
12 Entry of time of day Changes controller operating line 38
13 Display of d.h.w. temperature
Only with plant types providing d.h.w. heating
14 Display of boiler temperature
15 Display of flow temperature
(Only with plant type 3 - x)
16
17
51
Holidays
Reset to default values
Bus address
Controller switches to protection mode
QAW70 default entries apply
When using RVP340 or RVP35.., the bus address to be entered on the room unit is
1
52 Identification of room unit
53 Operating lock on QAW70 No impact on the controller
58 Type of setpoint display No impact on the controller
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20.1.4 Interplay with SYNERGYR central unit OZW30
Based on the room temperature of the individual apartments, the OZW30 central unit (software version 3.0 or higher) generates a load compensation signal. This signal is passed on via LPB to the controller where it leads to an appropriate change of the flow temperature setpoint.
20.2 Communication with other devices
RVP340 and RVP350 offer the following communication choices:
Forwarding the heat demand of several RVP3... to the heat source
Exchange of locking and forced signals
Exchange of measured values, such as outside temperature, return temperature and flow temperature, plus clock signals
Communication with other devices
Exchange of error messages
For detailed information about communication via LPB, refer to the following pieces of documentation:
Data Sheet N2030: LPB Basic System Data
Data Sheet N2032: LPB Basic Engineering Data
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Operating elements
21 Handling
21.1 Operation
21.1.1 General
7
8
1
2
3
4
5
6
Buttons for selecting the operating mode (button pressed is lit)
Display (LCD, RVP35..-specific)
Buttons for selecting the operating lines
Button for manual control ON/OFF
Buttons for valve OPEN/CLOSE when manual control ON
Button for d.h.w. heating ON/OFF (ON = button lit)
Knob for readjusting the room temperature
Buttons for adjusting values
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LCD and status display RVP3..
Operating Instructions
Buttons for heating circuit operating mode
D.h.w. button
Knob for room temperature readjustments
Display (LCD)
1* Burner operation stage 1 and stage 2
2* Operation of circulating pump M1
3 Positioning signals to the actuator
Bar below number 1 lit = actuator receives OPEN pulses
Bar below number 2 lit = actuator receives CLOSE pulses
4 Operation of heating circuit pump M2 and storage tank charging pump M3*
Example: Bar below number 2 lit = pump M2 runs
5 State of multifunctional relay K6
Example: Bar below symbol lit = relay energized
6 Current temperature level (nominal temperature/reduced temperature/holiday period)
Example: Bar below lit = heating to REDUCED temperature
7 Number of current operating line
8 Bus power supply ** available and active charging of d.h.w. storage tank by the solar circuit*
9 Display of "ECO function active" or ”Protection mode active”
10 Display of current heating program
11 Display of temperatures, times, dates, etc.
* Not available with RVP340
** Not available with RVP351
Operating Instructions are inserted at the rear of the controller's front cover. They are provided for caretakers and end-users and contain energy saving tips including instructions on thoubleshooting.
21.1.2 Operating elements
4 buttons are available for selection of the heating circuit’s operating mode. Each button has a built-in LED; the currently active operating mode is indicated by the respective LED when lit.
A button is available for switching d.h.w. heating on and off. When pressing the button, d.h.w. heating is switched on or off. The button is lit when d.h.w. heating is ON.
Manual d.h.w. charging is triggered by pressing the same button.
A knob is available for making manual room temperature readjustments. Its scale shows the room temperature change in °C. When turning the knob, the heating curve is displaced parallel.
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Buttons and displays for manual control
Display of positioning commands
Operating line principle
Buttons
Block skip function
3 buttons are provided for manual control:
1 button for activating manual control. An LED indicates when manual control is active. Manual control is quit by pressing the same button again or by pressing any of the operating mode buttons
2 buttons for manual positioning commands. In plants with mixing valves or
2-port valves, the actuating device can be driven to any position by pressing the respective button.
When pressing a button, the respective LED lights up
All positioning commands sent to the relays appear on the LCD.
Input and readjustment of all setting parameters, activation of functions and reading of actual values and operating states are based on the operating line principle.
An operating line with an associated number is assigned to each parameter, each actual value and each function.
A pair of buttons is used to select operating lines and readjust displays.
To select and readjust setting values, the procedure is as follows:
Buttons Action
Line selection buttons Press
Press
Setting buttons
Press
Press
The set value is adopted …
Effect
Selection of next lower operating line
Selection of next higher operating line
Decrease of displayed value
Increase of displayed value
when selecting the next operating line,
by pressing any of the operating mode buttons.
If input of --.- or --:-- is required, button or must be pressed until the required display appears. Then, the display maintains --.- or --:--.
The operating lines are combined in the form of blocks. To reach a specific operating line of a function block quickly, the other blocks can be skipped, so that it is not necessary to go through all the other lines. This is made possible by using 2 button combinations:
Action
Keep depressed and press
Keep depressed and press
Effect
Selection of next higher function block
Selection of next lower function block
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Info values
Setting levels
Access rights
Basic information about the plant is obtained by pressing and .
Meaning:
Number Plant information
---
0
Time of day
Outside temperature B9
4* D.h.w. temperature B31
5*
6*
D.h.w. temperature B32
Collector temperature B6
7* Boiler temperature B2
* Not available with RVP340
The information selected last is continuously displayed.
21.1.3 Setting levels and access rights
The operating lines are assigned to different levels. Assignment and access are as follows:
Level
Enduser
Heating engineer
Op. lines
1 to 50
51 to 208
Locking level 248
Access
Press or
Press
Press
and
and
simultaneously for 3 seconds
simultaneously until appears; then, press , , and , one after the other
The end-user can access all analog operating elements. This means that he can select the operating mode, readjust the room temperature with the knob, and activate manual control. Also, he is allowed to access operating lines 1 through 50
The heating engineer can access all operating elements and all operating lines
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Selecting operating line "Plant type"
Setting the other operating lines
Operating lines for function checks
21.2 Commissioning
21.2.1 Installation Instructions
The controller is supplied complete with Installation Instructions covering in detail installation, wiring and commissioning with function checks and settings. The instructions address trained specialists. Each operating line has an empty field where the set value can be entered.
The Installation Instructions together with the plant’s documentation should be kept in a safe place!
21.2.2 Operating lines
The most important task when a plant is commissioned is to enter the required type of plant. This input activates all functions and settings required for the selected type of plant.
All operating lines contain proven and practice-oriented values. The Installation
Instructions show codings and give guide values, comments, etc., where required.
Function block "Service functions" contains 4 operating lines that are especially suited for making function checks:
Operating line 161 permits simulation of the outside temperature
Operating line 162 can be used to energize any of the output relays
Operating line 163 can be used to query any of the actual values of sensors
Operating line 164 can be used to query any of the sensor setpoints or limit values
If Er appears on the display , the error can be pinpointed via the error code on operating line 50.
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21.3 Installation
21.3.1 Mounting location
The ideal location for the controller is a dry room, such as the boiler room.
The permissible ambient temperature is 0...50 °C.
When the mounting location is selected, the controller can be fitted as follows:
In a control panel, on an inner wall or on a top hat rail
On a panel front
In a control panel front
In the sloping front of a control desk
21.3.2 Mounting choices
The controller can be mounted in one of 3 different ways:
Wall mounting: The base is secured to a flat wall with 3 screws
Rail mounting: The base is snapped on a top hat rail
Flush-panel mounting: The base is fitted in a panel cutout measuring
138 x 92 mm. The thickness of the front panel may be 3 mm maximum
21.3.3 Electrical installation
Local electrical safety regulations must be complied with
The electrical installation must be made by qualified personnel
The cable lengths should be chosen such that there is sufficient space to open the control panel door
Cable strain relief must be ensured
The cable glands used must be made of plastic
The cables of the measuring circuits carry extra low-voltage
The cables from the controller to the actuating devices and pumps carry mains voltage
Sensor cables must not be run parallel to mains carrying cables
A defective or apparently damaged unit must immediately be disconnected from power
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22 Engineering
22.1 Connection terminals
RVP350
RVP351
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Low-voltage side Mains voltage side
DB Data LPB
MB Ground for LPB room unit
N
L
Neutral conductor AC 230 V
Live AC 230 V
A6 PPS (point-to-point interface), connection of F4 Input for K4
MD Ground for PPS
B9 Outside sensor
B1 Flow sensor
K4 1. burner stage
F5 Input for K5
K5 2. burner stage
F3 Input for Q1 and Q3
M Ground for sensors and changeover contacts Q1 Circulating pump
B31 Storage tank sensor/thermostat at the top Q3 Storage tank charging pump
B32 Storage tank sensor/thermostat at the bottom F1/F2 Input for Y1 and Y2
B7 Return sensor
H1 Changeover contact "Operating mode"
B5 Room sensor
B6 Collector sensor
In addition to the standard connection terminals, auxiliary terminals for M are provided
Y1 Heating circuit mixing valve/2-port valve OPEN
Y2 Heating circuit mixing valve/2-port valve CLOSE
F7 Input for Q2, K6, and K7
Q2 Heating circuit pump
K6 Multifunctional relay
K7 Multifunctional relay
In addition to the standard connection terminals, auxiliary terminals for N and are provided
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RVP340
22.2 Connection diagrams
22.2.1 Low-voltage side
RVP350 and RVP351
RVP340
* LPB only with RVP350
22.2.2 Mains voltage side
RVP350 and RVP351
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Key A6 Room unit
B1 Flow sensor
B2 Boiler sensor (only RVP35..)
B31 D.h.w. storage tank sensor/thermostat (only RVP35..)
B32 D.h.w. storage tank sensor/thermostat (only RVP35..)
B5 Room sensor
B6 Collector sensor (only RVP35..)
B7 Return sensor
B9 Outside sensor
E1 2-stage burner (only RVP35..)
F1 Thermal reset limit thermostat (only RVP35..)
F2 Safety limit thermostat (only RVP35..)
Kx K6, K7 = multifunctional outputs
LPB Data bus (only RVP340 and RVP350)
M1 Circulating pump (only RVP35..)
M2 Heating circuit pump
M3 Storage tank charging pump (only RVP35..)
N1 Controller RVP3...
S1 Remote control of operating mode
Y1 Actuator heating circuit
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23.1 Basic design
The RVP3.. controller consists of controller insert, which accommodates the electronics, the power section, the output relays and – on the front – all operating elements, and the base, which carries the connection terminals. On the inner side of the cover, there is a holder where the Operating Instructions can be inserted.
The controller has the standard overall dimensions 96 mm x 144 mm.
It can be mounted in one of 3 different ways:
Wall mounting
Mounting on a top hat rail
Flush-panel mounting
Whichever mounting method is chosen, the base must always be mounted and wired first. To ensure orientation will be correct, the upper side of both the base and the controller housing carry the marking TOP. Both the top and the bottom side of the base have 5 knockout holes for cable entry; there are 10 knockout holes in the floor.
The controller insert plugs into the base. The controller insert has 2 fixing screws with rotating levers. If, after insertion of the controller insert, one of the screws is tightened, the lever engages in an opening in the base. When the screws are further tightened (alternately), the controller pulls itself into the base so that it is secured.
23.2 Dimensions
Dimensions in mm
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24 Addendum
24.1 Technical data
For technical data, refer to Data Sheet N2545.
24.2 Revision history
Edition 1.0 is the first publication of this document. So there are no alterations against any previous editions.
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Index
2
2-position control ............................................ 43, 46
2-position controller .............................................. 45
3
3-position control .................................................. 44
A
Absolute priority .................................................... 59
Access rights ........................................................ 97
Acknowledgement ................................................ 28
Acquisition of measured values............................ 19
Addressing QAW50.03 ......................................... 90
Addressing the devices ........................................ 80
Alternating mode................................................... 68
Analog operating elements................................... 95
Assignment of d.h.w. heating................................ 56
Attenuated outside temperature ........................... 31
Automatic ECO function ....................................... 30
Auxiliary terminals............................................... 100
Averaging.............................................................. 19
B
B31 ....................................................................... 21
B32 ....................................................................... 21
B6.......................................................................... 22
B7.......................................................................... 21
B9.......................................................................... 20
Base.................................................................... 103
Basic heating curve settings................................. 38
Block skip function................................................ 96
Boiler operating mode .......................................... 45
Boiler temperature ................................................ 20
Boost heating........................................................ 36
Boost of d.h.w. charging temperature................... 62
Building time constant........................................... 30
Burner cycling protection ...................................... 46
Burner running time .............................................. 46
Bus loading number.............................................. 81
Bus power supply ................................................. 81
Buttons for heating circuit operating mode........... 95
Buttons for manual control.................................... 95
C
Central unit OZW30.............................................. 93
Charging temp. solar maximum limitation ............ 87
Circulating pump................................................... 66
Collector off temperature ...................................... 88
Collector pump................................................ 67, 84
Collector sensor.................................................... 22
Collector start function .......................................... 88
Collector temperature ........................................... 83
Siemens
Building Technologies
Combinations ........................................................14
Commissioning......................................................98
Commissioning aids ..............................................73
Communication .....................................................93
Compensating and auxiliary variables ..................30
Composite outside temperature ............................30
Connection terminals...........................................100
Contact H1.............................................................76
Control with 1-stage burner...................................46
Control with 2-stage burner...................................47
Controller insert ...................................................103
Critical locking signals...........................................78
Current outside temperature .................................30
D
D.h.w......................................................................56
D.h.w. actual value ................................................26
D.h.w. button .........................................................95
D.h.w. charging......................................................67
D.h.w. heating modes............................................17
D.h.w. NORMAL setpoint ......................................25
D.h.w. REDUCED setpoint....................................25
Deflection of heating curve....................................39
Digital operating elements.....................................96
Dimensions..........................................................103
Direct burner control..............................................45
Display of errors ....................................................28
Documentation ......................................................10
Dwelling time (legionella function).........................69
E
Early shutdown......................................................35
ECO heating limits.................................................31
Economy button ....................................................90
Electronics...........................................................103
Engineering .........................................................100
ERROR .................................................................28
Error handling........................................................19
Error messages .....................................................28
Evaporation temp. of heat conducting medium.....87
F
Faults.....................................................................28
Features ..................................................................9
Fields of use ..........................................................11
Flow temperature ..................................................20
Flue gas condensation ..........................................51
Flush-panel mounting............................................99
Forced charging ....................................................63
Forced signal.........................................................49
Frost protection for d.h.w.......................................56
Frost protection for the boiler ................................48
Frost protection for the building.............................23
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CE1P2545en
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Frost protection for the collector ........................... 84
Frost protection for the plant................................. 75
Frost protection function solar .............................. 84
Frost protection, plant ........................................... 75
Function block actuator heating circuit ...................................... 42 boiler.................................................................. 45 d.h.w. ................................................................. 56 district heat ........................................................ 54 end-user d.h.w................................................... 25 end-user general ............................................... 27 end-user space heating..................................... 23 legionella function.............................................. 69 locking functions................................................ 89 multifunctional relays......................................... 65 plant configuration ............................................. 29 service functions and general settings .............. 72 setpoint return temperature limitation................ 51 solar d.h.w. ........................................................ 82 space heating .................................................... 30
G
Gain factor room influence.................................... 38
Generation of setpoint .......................................... 41
Gradient collector start function ............................ 88
H
Handling................................................................ 94
Heat demand ........................................................ 66
Heat storage capacity ........................................... 30
Heating circuit functions........................................ 11
Heating circuit operating modes ........................... 16
Heating curve.................................................. 38, 42
Heating limits ........................................................ 31
Heating program ................................................... 24
Heating up brake .................................................. 43
Holiday mode .................................................. 16, 24
Holiday period ....................................................... 24
Holiday program.................................................... 24
Hours run counter ................................................. 72
I
Info values............................................................. 97
Inputs for LPB ....................................................... 79
Installation............................................................. 99
Installation Instructions ......................................... 98
Integral .................................................................. 47
Interconnected plants............................................ 44
Interruption............................................................ 19
K
K6.......................................................................... 65
K7.......................................................................... 65
Knob...................................................................... 95
Knob for readjustments QAW70 ........................... 91
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Building Technologies
Basic Documentation RVP340, RVP350, RVP351
Index
L
Legionella function ......................................... 63, 69
Legionella setpoint ............................................... 69
Legionella weekday.............................................. 69
Line selection buttons........................................... 96
Locking functions.................................................. 89
Locking on the software side................................ 89
Locking signal gain............................................... 77
Locking the settings.............................................. 89
LPB....................................................................... 79
M
Manual control ...................................................... 17
Manual d.h.w. charging .................................. 12, 64
Manual positioning commands............................. 95
Master clock ......................................................... 79
Maximum charging time ....................................... 62
Maximum limitation of boiler temperature ............ 46
Maximum limitation of charging temp. solar......... 87
Maximum limitation of flow temperature............... 42
Maximum limitation of primary return temp. ......... 54
Maximum limitation of rate of setpoint increase. .. 43
Maximum limitation of room temperature............. 37
Maximum limitation of storage tank temp............. 85
Mechanical design.............................................. 103
Minimum charging temperature solar................... 83
Minimum limitation of boiler temperature ............. 46
Minimum limitation of flow temperature................ 42
Minimum running time collector pump ................. 84
Mounting location ................................................. 99
Multifunctional relays............................................ 65
N
No priority ............................................................. 59
O
Operating Instructions .......................................... 95
Operating level ..................................................... 18
Operating line principle......................................... 96
Operating lines ..................................................... 98
Operating lines QAW70........................................ 91
Operating state ..................................................... 18
Operation.............................................................. 94
Operation of circulating pump (legionella funct.).. 70
Optimization.......................................................... 32
Optimized switching off......................................... 35
Optimized switching on ........................................ 36
Output relays ...................................................... 103
Outside sensor ..................................................... 20
Outside temperature............................................. 20
Outside temperature source................................. 80
Overheating of collector pump ............................. 87
Overlapping heating phases................................. 24
Overriding of operating mode............................... 76
Overrun................................................................. 63
Overtemperature protection for the collector........ 85
CE1P2545en
15.03.2011
P
Parallel displacement of heating curve................. 40
Parallel operation.................................................. 59
Periodic pump run................................................. 77
Plant type........................................................ 18, 29
Plant types ............................................................ 13
Progression of outside temperature ..................... 30
Protection against boiler overtemperatures.......... 49
Protection against discharging ............................. 63
Protection against overtemperatures.................... 49
Protection mode.................................................... 16
Protective boiler startup........................................ 49
Protective startup.................................................. 49
Pulse lock heating circuit control .......................... 44
Pump kick ............................................................. 77
Pump M1 ........................................................ 20, 50
Pump overrun ................................................. 63, 76
Q
QAW70 operating lines......................................... 91
Quick setback ....................................................... 35
R
Rail mounting........................................................ 99
Recooling storage tank (solar).............................. 86
Reduction of flow temperature setpoint................ 37
Relay test.............................................................. 73
Release integral.................................................... 47
Release of d.h.w. heating ..................................... 57
Reset integral........................................................ 47
Return temperature............................................... 21
Room influence..................................................... 38
Room model ................................................... 19, 34
Room model temperature..................................... 34
Room sensor ........................................................ 19
Room temperature................................................ 19
Room temperature deviation ................................ 38
Room temperature setpoint boost ........................ 36
Room temperature source.................................... 32
Room unit QAW50/QAW50.03 ............................. 90
Room unit QAW70................................................ 91
S
Safety functions .................................................... 46
Scheduler program 2 ............................................ 27
Sealing................................................................ 103
Selecting the plant type ........................................ 29
Sensor test............................................................ 74
Service functions ...................................................72
Setpoint for common flow......................................60
Setpoint for holiday mode .....................................23
Setpoint increase...................................................43
Setpoint return temperature limitation ...................51
Setpoints................................................................23
Setting buttons ......................................................96
Setting levels .........................................................97
Shifting priority.......................................................59
Short-circuit ...........................................................19
Simulation of outside temperature ........................73
Slope of maximum limitation .................................54
Software version....................................................72
Solar charging, temperature differential ................83
Sommertime ..........................................................27
Source of time of day ............................................79
Storage tank recooling (solar) ...............................86
Storage tank sensor ..............................................60
Storage tank temperature......................................21
Storage tank thermostat ........................................60
Stored heat ............................................................30
Suitable actuators..................................................10
Suitable room units................................................10
Suitable sensors......................................................9
Summertime ..........................................................77
Switching differential d.h.w. ...................................60
T
Technical data .....................................................104
Temperature boost mixing valve/heat exchanger .44
Temperature differential solar................................83
Test relays .............................................................73
Test sensors ..........................................................74
Time of day (legionella function) ...........................69
Type of actuator.....................................................43
Type summary.........................................................9
Types of heating systems......................................11
Types of houses and buildings..............................11
U
Uncritical locking signals .......................................77
W
Wall mounting........................................................99
Winter-/summertime changeover ..........................77
Wintertime........................................................27, 77
Wiring ....................................................................98
Siemens
Building Technologies
Basic Documentation RVP340, RVP350, RVP351
Index
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CE1P2545en
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
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Siemens
Building Technologies
Basic Documentation RVP340, RVP350, RVP351
© 2011 Siemens Switzerland Ltd
Subject to change
CE1P2545en
15.03.2011
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Key features
Controls 1 heating circuit
Easy to install and use
Suitable for a variety of heating systems
Comes with a variety of features
Compact design
Backlit display
Intuitive user interface
Can be used to control multiple heating zones
Can be used to control a variety of actuators
Can be used to control a variety of sensors
Frequently asked questions
The RVP340 can be used with a variety of heating systems, including those with radiators, underfloor heating, and fan coils.
Yes, the RVP340 is easy to install and use. It comes with a variety of features that make it a great choice for controlling your home's heating system.
Yes, the RVP340 can be used to control multiple heating zones.
Yes, the RVP340 can be used to control a variety of actuators.
Yes, the RVP340 can be used to control a variety of sensors.
Yes, the RVP340 can be used to control a variety of communication protocols.
