Siemens RVL 480, RVL 479 Heating Controller Basic Documentation

Heating Controllers RVL480 and RVL479

Basic Documentation

Edition 1.0

Controller series A

CE1P2540en

20.05.2008

Building Technologies

Siemens Switzerland Ltd

Building Technologies Group

International Headquarters

Gubelstrasse 22

CH – 6301 Zug

Tel. +41 41 724 24 24

Fax +41 41 724 35 22 www.sbt.siemens.com

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Building Technologies

Heating Controllers RVL480 and RVL479 c

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Contents

2

2.1

2.2

2.3

2.4

1 Summary ........................................................................................... 9

1.1

1.2

RVL480 and RVL479............................................................................ 9

Brief description and key features........................................................... 9

1.3

Equipment combinations ....................................................................... 9

1.3.1

Suitable sensors .................................................................................. 9

1.3.2

Suitable room units............................................................................. 10

1.3.3

Suitable actuators............................................................................... 10

1.3.4

Communication.................................................................................. 10

1.3.5

Passing on of heat demand signal........................................................ 10

1.3.6

Product documentation ....................................................................... 10

Use .................................................................................................. 11

Types of plant.................................................................................... 11

Types of buildings .............................................................................. 11

Types of heating systems.................................................................... 11

Functions .......................................................................................... 11

3 Fundamentals.................................................................................. 13

3.1

Key technical features......................................................................... 13

3.1.1

Plant types with regard to the heating circuit .......................................... 13

3.1.2

Function blocks.................................................................................. 13

3.2

Plant types ........................................................................................ 14

3.3

3.4

Plant types and function blocks............................................................ 16

Operating modes................................................................................ 16

3.4.1

Automatic mode................................................................................. 16

3.4.2

Continuous REDUCED heating............................................................ 16

3.4.3

Continuous NORMAL heating.............................................................. 16

3.4.4

Protection.......................................................................................... 17

3.4.5

Manual operation ............................................................................... 17

3.4.6

Plant type and operating mode............................................................. 17

3.5

Operational status and operational level ................................................ 17

4 Acquisition of measured values........................................................ 18

4.1

Room temperature (A6, B5)................................................................. 18

4.1.1

Measurement..................................................................................... 18

4.1.2

Handling of faults ............................................................................... 18

4.1.3

Room model...................................................................................... 18

4.2

Flow and boiler temperature (B1).......................................................... 18

4.2.1

Measurement..................................................................................... 18

4.2.2

Handling of faults ............................................................................... 19

Heating Controllers RVL480 and RVL479

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6

6.1

6.2

6.3

4.3

Outside temperature (B9).....................................................................19

4.3.1

Measurement .....................................................................................19

4.3.2

Handling of faults................................................................................19

4.4

Primary return temperature (B7)............................................................19

4.4.1

Measurement .....................................................................................19

4.4.2


4.5

Secondary return temperature (B71)......................................................20

4.5.1

Measurement .....................................................................................20

4.5.2


5 Function block "End-user space heating" ..........................................21

5.1

Operating lines ...................................................................................21

5.2

Setpoints ...........................................................................................21

5.2.1

General .............................................................................................21

5.2.2

Frost protection for the building.............................................................21

5.3

5.4

Heating program.................................................................................21

Holiday program .................................................................................22

Function block "End-user general"....................................................23

Operating lines ...................................................................................23

Time of day and date...........................................................................23

Indication of faults ...............................................................................23

7

7.1

7.2

Function block "Plant type"...............................................................24

Operating line.....................................................................................24

General .............................................................................................24

8 Function block "Space heating".........................................................25

8.1

8.2

Operating lines ...................................................................................25

ECO function......................................................................................25

8.2.1

Compensating variables and auxiliary variables ......................................25

8.2.2

Heating limits......................................................................................26

8.2.3

Mode of operation...............................................................................26

8.2.4

Operating modes and operational statuses.............................................27

8.3

8.4

Room temperature source....................................................................27

Optimization.......................................................................................27

8.4.1

Definition and purpose.........................................................................27

8.4.2

Fundamentals.....................................................................................27

8.4.3

Process.............................................................................................28

8.4.4

Room model temperature.....................................................................28

8.4.5

Optimum stop control...........................................................................29

8.4.6

Quick setback.....................................................................................29

8.4.7

Optimum start control ..........................................................................29


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8.4.8

Boost heating .................................................................................... 30

8.5

Room functions .................................................................................. 31

8.5.1

Maximum limitation of the room temperature.......................................... 31

8.5.2

Room temperature influence................................................................ 31

8.6

Heating curve .................................................................................... 32

8.6.1

Purpose............................................................................................ 32

8.6.2

Basic setting...................................................................................... 32

8.6.3

Deflection.......................................................................................... 32

8.6.4

Parallel displacement of heating curve .................................................. 33

8.6.5

Display of setpoints ............................................................................ 33

8.7

Generation of setpoint......................................................................... 34

8.7.1

Weather-compensated control ............................................................. 34

8.7.2

Demand-compensated control ............................................................. 34

9 Function block "3-position actuator heating circuit" .......................... 35

9.1

9.2

Operating lines................................................................................... 35

Limitations......................................................................................... 35

9.2.1

Limitations of the flow temperature ....................................................... 35

9.2.2

Setpoint increase............................................................................... 35

9.3

9.4

9.5

3-position control................................................................................ 36

Excess mixing valve temperature ......................................................... 36

Pulse lock ......................................................................................... 36

10 Function block "Boiler" .................................................................... 37

10.1

Operating lines................................................................................... 37

10.2

Operating mode................................................................................. 37

10.3

Limitations......................................................................................... 37

10.3.1

Maximum limitation of the boiler temperature ......................................... 37

10.3.2

Minimum limitation of the boiler return temperature................................. 38

10.4

2-Position control ............................................................................... 38

10.4.1

Control with a single-stage burner......................................................... 38

10.4.2

Control with a 2-stage burner............................................................... 39

10.4.3

Frost protection for the boiler ............................................................... 40

10.4.4

Protective boiler startup....................................................................... 40

10.4.5

Protection against boiler overtemperatures ............................................ 41

10.5

Operating mode of pump M1................................................................ 42

11 Function block "Setpoint of return temperature limitation"................. 43

11.1

Operating line.................................................................................... 43

11.2

Description........................................................................................ 43

11.3

Minimum limitation of the return temperature.......................................... 43

11.3.1

Acquisition of the measured values....................................................... 43

11.3.2

Mode of operation .............................................................................. 43


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11.3.3

Mode of operation with a single unit (with no bus)....................................44

11.3.4

Mode of operation in interconnected plants.............................................44

12 Function block "District heat"............................................................45

12.1

Operating lines ...................................................................................45

12.2

Limitations .........................................................................................45

12.2.1

Secondary flow temperature.................................................................45

12.2.2

Maximum limitation of primary return temperature ...................................45

12.2.3

Maximum limitation of the return temperature differential (DRT limitation) ...46

12.2.4

Integral action time..............................................................................47

12.2.5

Minimum limitation of stroke (suppression of hydraulic creep) ...................47

12.2.6

Flow limitation.....................................................................................47

13 Function block "Service functions and general settings" ....................48

13.1

Operating lines ...................................................................................48

13.2

Display functions.................................................................................48

13.2.1

Flow temperature setpoint....................................................................48

13.2.2

Heating curve .....................................................................................49

13.3

Commissioning aids ............................................................................50

13.3.1

Simulation of outside temperature .........................................................50

13.3.2

Relay test...........................................................................................50

13.3.3

Sensor test.........................................................................................50

13.3.4

Test of H-contacts...............................................................................51

13.4

Auxiliary functions ...............................................................................52

13.4.1

Frost protection for the plant .................................................................52

13.4.2

Flow alarm.........................................................................................52

13.4.3

Manual overriding of operating mode (contact H1)...................................53

13.4.4

Pump overrun.....................................................................................53

13.4.5

Pump kick ..........................................................................................54

13.4.6

Winter- / summertime changeover .........................................................54

13.4.7

Gain of locking signal...........................................................................54

13.5

Entries for LPB ...................................................................................55

13.5.1

Source of time of day...........................................................................55

13.5.2

Source of outside temperature..............................................................56

13.5.3

Addressing of devices..........................................................................56

13.5.4

Bus power supply................................................................................57

13.5.5

Bus loading characteristic.....................................................................57

13.6

Heat demand output DC 0...10 V...........................................................57

14 Function block "Contact H2" .............................................................58

14.1

Operating line.....................................................................................58

14.2

Description.........................................................................................58

15 Function block " Contact H2 and general displays" ............................59


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15.1

Operating lines................................................................................... 59

15.2

Contact H2........................................................................................ 59

15.3

Hours run counter............................................................................... 59

15.4

Software version ................................................................................ 59

15.5

Identification number of room unit......................................................... 59

16 Function block "Locking functions" .................................................. 60

16.1

Operating line.................................................................................... 60

16.2

Locking the settings on the software side............................................... 60

16.3

Locking the settings for district heat on the hardware side........................ 60

17 Communication................................................................................ 61

17.1

Combination with room units................................................................ 61

17.1.1

General............................................................................................. 61

17.1.2

Combination with room unit QAW50...................................................... 61

17.1.3

Combination with room unit QAW70...................................................... 62

17.2

Combination with SYNERGYR central unit OZW30................................. 64

17.3

Communication with other devices........................................................ 64

18 Heating controller RVL479 ................................................................ 65

18.1

Features and function ......................................................................... 65

18.2

Technical design................................................................................ 65

18.2.1

Type of plant...................................................................................... 65

18.2.2

Operation with a partner...................................................................... 65

18.2.3

Handling errors .................................................................................. 66

18.2.4

Passive mode.................................................................................... 66

19 Handling .......................................................................................... 67

19.1

Operation.......................................................................................... 67

19.1.1

General............................................................................................. 67

19.1.2

Analog operating elements.................................................................. 68

19.1.3

Digital operating elements................................................................... 68

19.1.4

Setting levels and access rights ........................................................... 69

19.2

Commissioning.................................................................................. 70

19.2.1

Installation instructions ........................................................................ 70

19.2.2

Operating lines................................................................................... 70

19.3

Installation......................................................................................... 70

19.3.1

Location............................................................................................ 70

19.3.2

Mounting choices ............................................................................... 70

19.3.3

Wiring............................................................................................... 71

20 Engineering...................................................................................... 72

20.1

Connection terminals .......................................................................... 72

20.1.1

Low voltage side ................................................................................ 72


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20.1.2

Mains voltage side ..............................................................................72

20.2

Connection diagrams...........................................................................73

22

21 Mechanical design ............................................................................74

21.1

Basic design.......................................................................................74

21.2

Dimensions ........................................................................................74

Technical data...................................................................................75

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1 Summary

1.1 RVL480 and RVL479

This Basic Documentation covers two types of heating controllers, the RVL480 and the

RVL479. The RVL480 is described in every detail, not so the RVL479.

The RVL479 contains functions of the RVL480 and is therefore integrated in the present Basic Documentation. But only the chapter “18 Heating controller RVL479” refers to the specific functionality of the RVL479 (functions that differ from those of the

RVL480). In all the other chapters and sections, the RVL479 will not be specifically mentioned.

1.2 Brief description and key features

•

The RVL480 is a multi-functional heating controller for use in residential and nonresidential buildings. It is suited for weather-compensated flow temperature control of heating zones with or without room temperature influence or for demand-compensated control of heat generating equipment (precontrol)

•

It is used in plants with own heat generating equipment or with a district heat connection

•

The RVL480 is capable of communicating with other units via LPB (Local Process

Bus)

•

The RVL480 has 6 types of plants pre-programmed. When a certain plant type is selected, all functions and settings required for that particular plant will be activated

•

For the direct setting of the heating curve, the proven bar is used, but digital adjustment of the heating curve is also possible. For readjustment of the room temperature, a setting knob is used

•

A scalable voltage output DC 0…10 V is used to pass the heat demand signal to other systems

•

All other parameters are set digitally using the operating line principle

•

Operating voltage AC 230 V, CE conformity, overall dimensions to IEC 61554

(144 × 144 mm)

1.3 Equipment combinations

1.3.1 Suitable sensors

•

For water temperatures:

Suitable are all types of temperature sensors that use a sensing element

LG-Ni 1000. The following types are presently available:

−

Clamp-on temperature sensor QAD22

−

Immersion temperature sensor QAE212…

−

Immersion temperature sensor QAP21.3 with integrated connecting cable

•

For the room temperature:

Suitable are all types of temperature sensors that use a sensing element

LG-Ni 1000.

−

Room temperature sensor QAA24

•

For the outside temperature:

−

−

Outside sensor QAC22 (sensing element LG-Ni 1000)

Outside sensor QAC32 (sensing element NTC 575)

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Note

1.3.2 Suitable room units

•

Room unit QAW50

•

Room unit QAW70

1.3.3 Suitable actuators

All Siemens actuators with the following features can be used:

•

Electric or electro-hydraulic actuators with a running time of 0.5 to 14.5 minutes

•

Suitable for 3-position control

•

Operating voltage AC 24 V … AC 230 V

1.3.4 Communication

Communication is possible with the following types of units:

•

All controllers made by Siemens with LPB communication capability

•

SYNERGYR central unit OZW30 (software version 3.0 or higher)

The heating controller RVL480 cannot be used as partner unit for the RVL469!

1.3.5 Passing on of heat demand signal

The scalable DC 0…10 V signal can be used to pass the heat demand signal to other devices in the system.

1.3.6 Product documentation

Document

Data Sheet RVL480

Data Sheet RVL479

Operating Instructions (all RVL types)*

Installation Instructions RVL480, languages de, en, fr, nl, sv, fi, da, it, es

Installation Instructions RVL479, languages de, en, fr, nl, sv, fi, da, it, es

CE Declaration of Conformity (all RVL types)

Doc. number Stock number

N2540

–

N2543

B2540

G2540

G2543

T2540

Environmental Declaration (RVL480 and RVL479) E2540

–

74 319 0616 0

74 319 0617 0

74 319 0620 0

–

Data Sheet QAW50

Data Sheet QAW70

N1635

N1637

–

–

–

Data Sheet LPB Basic System Data

Data Sheet LPB Basic Engineering Data

N2030

N2032

–

–

* unilingual , available in de, en, fr, nl, sv, fi, da, it, es

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2 Use

2.1 Types of plant

Basically, the RVL480 is suitable for all types of heating plants that use weathercompensated flow temperature control. In addition, it can be used for demandcompensated control of the main flow. Examples:

•

Heating zones with own heat generation

•

Heating zones with a direct or indirect district heat connection

•

Main groups with own heat generation

•

Main groups with a direct or indirect district heat connection

•

Large plants comprising heat generation and several heating zones

2.2 Types of buildings

Basically, the RVL480 is suitable for all types of buildings that use weathercompensated heating control, but is designed specifically for use in:

•

Multi-family houses

•

Single-family houses

•

Non-residential buildings

2.3 Types of heating systems

The RVL480 is suitable for use with all standard heating systems, such as:

•

Radiators

•

Convectors

•

Underfloor heating systems

•

Ceiling heating systems

•

Radiant panels

2.4 Functions

The RVL480 is used if one or several of the following functions is / are required:

•

Weather-compensated flow temperature control

•

Flow temperature control through a modulating seat or slipper valve, or boiler temperature control through direct control of a single- or 2-stage burner

•

Optimum start / stop control according to the selected weekly program

•

Quick setback and boost heating according to the selected weekly program

•

ECO function: demand-dependent switching of the heating system based on the type of building construction and the outside temperature

•

Weekly program for building occupancy with a maximum of three setback periods per day and daily varying occupancy schedules

•

Voltage output DC 0…10 V for passing on the heat demand signal

•

Entry of eight holiday periods per year

•

Automatic summer-/wintertime changeover

•

Display of parameters, actual values, operational statuses and fault status signals

•

Communication with other units via the LPB

•

Remote operation with the help of a room unit and external switches

•

Service functions

•

Frost protection for the plant, the boiler and the building

•

Minimum or maximum limitation of return temperature

•

DRT limitation (limitation of the temperature differential)

•

Minimum and maximum limitation of flow temperature


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•

Maximum limitation of room temperature

•

Periodic pump run

•

Pump overrun

•

Maximum limitation of the rate of setpoint increase

•

Flow alarm

For application examples, refer to chapter "3. Fundamentals".

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3 Fundamentals

3.1 Key technical features

The RVL480 offers two key technical features:

•

The controller has six plant types preprogrammed

•

The settings are combined in the form of function blocks

3.1.1 Plant types with regard to the heating circuit

In terms of the heating circuit, the following plant types are available:

•

Plant type 1 – "Heating circuit control with mixing group"

•

Plant type 2 – "Heating circuit control with boiler "

•

Plant type 3 – "Heating circuit control with heat exchanger"

•

Plant type 4 – "Precontrol with mixing group, heat demand signal via data bus”

•

Plant type 5 – "Precontrol with boiler, heat demand signal via data bus”

•

Plant type 6 – "Precontrol with heat exchanger, heat demand signal via data bus”

3.1.2 Function blocks

The following function blocks are available:

•

Function block "End-user 1"

•

Function block "End-user 2"

•

Function block "Plant type"

•

Function block "Space heating"

•

Function block "Three-position actuator for heating circuit"

•

Function block "Boiler"

•

Function block "Setpoint of return temperature limitation"

•

Function block "Settings for plant type 3"

•

Function block "Service functions and general settings"

•

Function block "Contact H2"

•

Function block "Contact H2 and general displays"

•

Function block “Locking functions”

For each function block, the required settings are available in the form of operating lines. A description of the individual functions is given below, for each function block and line.

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Plant type 1

Plant type 2

Plant type 3

3.2 Plant types

The RVL480 has six types of plant ready programmed, whereby the functions are assigned to each type of plant, as required. When commissioning a plant, the respective plant type must be selected.

Heating circuit control with mixing group

Space heating with weather-compensated flow temperature control. 3-position control through the heating zone's mixing valve. Outside temperature signal from own outside sensor or data bus. With or without room temperature influence. Heating-up and setback according to the heating program.

B9

A6/B5

B7

Heating circuit control with boiler

Space heating with own boiler, with weather-compensated boiler temperature control.

2-position control through a burner.

Outside temperature signal from own outside sens or or data bus. With or without room temperature influence. Heating-up and setback according to the heating program.

B9

A5/B6

E2

Heating circuit control with heat exchanger

Space heating with a district heat connection, with weather-compensated flow temperature control through the valve in the primary return of the district heat connection.

Outside temperature signal from own outside sensor or data bus. With or without room temperature influence. Heating-up and setback according to the heating program.

B9

A6/B5

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B7


3 Fundamentals

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Plant type 4 Precontrol with mixing group, heat demand signal via data bus

Precontrol with demand-compensated control of the main flow temperature. 3-position control through the mixing valve in the main flow.

Heat demand signal from the data bus. No heating program.

Plant type 5

B7

Precontrol with boiler, heat demand signal via data bus

Precontrol with demand-compensated boiler temperature control. 2-position control through the burner.


Plant type 6

B7

Precontrol with heat exchanger, heat demand signal via data bus

Precontrol with a district heat connection, with demand-compensated control of the secondary flow temperature through the valve in the primary return.


Siemens


B7 B71

A6 Room unit

B1 Flow / boiler temperature sensor

B5 Room temperature sensor

B7 Return temperature sensor (primary circuit)

B71 Return temperature sensor (secondary ci rcuit)

B9 Outside sensor

E1 Heat generating equipment (boiler or heat exchanger)

E2 Load (space)

LPB Data bus

M1 Heating circuit pump/ci rculating pump

N1 Controller RVL480

Y1 Heating circuit mixing valve / / 2-port valve


3 Fundamentals

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3.3 Plant types and function blocks

Level Function block Plant type

End-user level

Heating engineer level

End-user 1

End-user 2

Plant type

Space heating

3-position actuator for heating circuit

Boiler

Setpoint of return temperature limitation

Settings for plant type 3

Service functions and general settings

Contact H2

Contact H2 and general displays

Locking level Locking functions

The block diagram shows

•

the function blocks assigned to the three operational levels

•

the function blocks activated with the different plant types

1 2 3 4 5 6

l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l

3.4 Operating modes

The operating mode is selected on the controller by pressing the respective button.

Also, the operating mode can be changed by bridging terminals H1–M.

3.4.1 Automatic mode

•

Automatic changeover from NORMAL to REDUCED temperature, and vice versa, according to the entered weekly program

•

Automatic changeover to holiday mode, and back, according to the entered holiday schedule

•

Demand-dependent switching of the heating system in function of the room and outside temperature while giving consideration to the building's thermal inertia (ECO function)

•

Remote operation from a room unit (optional)

•

Frost protection is assured

3.4.2 Continuous REDUCED heating

•

Continuous heating to the REDUCED temperature

•

With ECO function

•

No holiday mode

•

Remote operation from a room unit not possible

•


3.4.3 Continuous NORMAL heating

•

Continuous heating to NORMAL temperature

•

No ECO function

•

No holiday mode

•

Remote operation from a room unit not possible

•


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3.4.4 Protection

•

Heating is switched off, but is ready to operate

•


3.4.5 Manual operation

The RVL480 can be switched to manual operation. In that case, the control will be switched off.

In manual operation, the various regulating units behave as follows:

•

Heating circuit mixing valve: it is not under voltage, but can be manually driven to any position by pressing the manual buttons / (close) and / (open).

The heating circuit pump/circulating pump M1 is continuously running.

•

Boiler: the two burner stages are continuously on. The manual button / can be used to switch the second stage on and off.

The heating circuit pump/circulating pump M1 is continuously running.

Manual operation also negates any overriding of the cont roller's operating mode (bridging H1–M).

3.4.6 Plant type and operating mode

Depending on the type of plant selected, the following operating modes are available:

Plant type

1

2

3

4

YES

YES

YES

YES

YES

YES

YES

NO

5 YES NO

6 YES NO

* Depending on the boiler's operating mode:

Boiler with automatic shutdown: NO

Boiler without manual shutdown: YES

YES

YES

YES

NO

NO

NO

YES

YES

YES

NO

*

NO

YES

YES

YES

YES

YES

YES

3.5 Operational status and operational level

The user selects the required operating mode by pressing the respective button. Each operating mode has a maximum of two operational statuses – with the exception of operating mode "Continuously NORMAL heating" (only one operational status possible). When the ECO function is activated and in the case of quick setback, the operational status is always OFF.

When the operational status is ON, there is a maximum of three operational levels, depending on the operating mode. The operational level is determined by the heating program and the holiday program.

Operating mode

OFF ON OFF ON OFF ON ON

Operating state

Operational level


3 Fundamentals

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4 Acquisition of measured values

4.1 Room temperature (A6, B5)

4.1.1 Measurement

The following choices exist:

•

A room temperature sensor QAA24 can be connected to terminal B5

•

A room unit QAW50 or QAW70 can be connected to terminal A6

•

A unit can be connected to each of the two terminals. In that case, the RVL480 can ascertain the average of the two measurements.

The other room unit functions will not be affected by averaging

4.1.2 Handling of faults

If there is a short -circuit or an interruption in one of the two measuring circuits, the control will respond as follows:

•

No sensor (operating line 65 = 0):

A short-circuit or open-circuit has no impact on the control. A fault status message will not be generated

•

Room unit sensor QAW… (operating line 65 = 1):

In the event of a short-circuit or open-circuit, the control continues to operate depending on the function of the room model. A fault status message will be generated

•

Room temperature sensor QAA24 (operating line 65 = 2):

In the event of a short-circuit or open-circuit, the control continues to operate depending on the function of the room model. A fault status message will be generated

•

Average value (operating line 65 = 3):

In the event of a short-circuit or open-circuit in one of the two measuring circuits, the control continues to operate with the normally working measuring circuit. A fault status message will be generated.

In the case of a short -circuit or open-circuit in both measuring circuits, the control continues to operate depending on the function of the room model. Two fault status messages will be generated

•

Automatic mode (operating line 65 = A):

Since the controller itself decides how it acquires the room temperature, no fault status messages can be generated

4.1.3 Room model

The RVL480 features a room model which simulates the development of the room temperature. In plants with no measurement of the room temperature, it can provide certain room functions (e.g. quick setback).

For more details, refer to section "8.4.4 Room model temperature".

4.2 Flow and boiler temperature (B1)


The flow or boiler temperature is acquired with one sensor having a sensing element

LG-Ni 1000. Averaging is not possible.

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A short-circuit or interruption in the measuring circuit is identified and displayed as a fault. In that case, the plant will respond as follows:

•

Plants with mixing valve control:

The heating circuit pump/circulating pump M1 continues to run and the mixing valve will close

•

Plants with boiler control:

The heating circuit pump/circulating pump M1 continues to run and the burner will shut down

4.3 Outside temperature (B9)


The outside temperature is acquired by the outside sensor, which may be a QAC22 or

QAC32:

•

QAC22: sensing element LG-Ni 1000

•

QAC32: sensing element NTC 575

The controller automatically identifies the type of sensor used. In interconnected plants, the outside temperature signal is made available via LPB. Controllers having their own sensor pass the outside temperature signal to the data bus.


If there is a short -circuit or an interruption in the measuring circuit, the control will respond as follows:

•

In the event of a short-circuit:

If an outside temperature is made available via LPB, it is used. If none is available, the control uses a fixed value of 0 °C outside temperature. A fault status signal is always generated

•

In the event of an interruption:

If the controller requires an outside temperature and it is made available via LPB, it is used. There will be no fault status signal in that case (this is the usual status in interconnected plants!). If, however, there is no outside temperature made available via

LPB, the control uses a fixed value of 0 °C. In that case, a fault status signal will be delivered

4.4 Primary return temperature (B7)


The primary return temperature is acquired with a sensor having a sensing element

LG-Ni 1000. This measured value is required for minimum and maximum limitation of the primary return temperature and for limitation of the temperature differential (DRT limitation).

In interconnected plants, the primary return temperature with plant type 1 can be acquired via the data bus. Controllers with plant type 1 and connected sensor pass the primary return temperature signal to the data bus.

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4 Acquisition of measured values

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If there is a short -circuit or an interruption in the measuring circuits, the control will respond as follows:

•

If, on the data bus, there is a return temperature from a controller of the same segment available, it is used (only with plant type no. 1). No fault status message will be generated since this is the normal status in interconnected plants

•

If, on the data bus, there is no return temperature available, the return temperature limitation functions will be deactivated and a fault status message generated

4.5 Secondary return temperature (B71)


The secondary return temperature is acquired with a sensor having a sensing element

LG-Ni 1000. This measured value is required for limitation of the temperature differential (DRT limitation; plant types 3 and 6), together with the primary return temperature.


If there is a short-circuit or open-circuit in the measuring circuit, and if the controller requires the return temperature, DRT limitation will be deactivated and a fault status message generated.

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Note

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5 Function block "End-user space heating"

This function block contains settings that the end-user himself can make.

5.1 Operating lines

Line Function, parameter

1 Setpoint for NORMAL heating

2 Setpoint for REDUCED heating

3 Setpoint for frost protection / holiday mode

4 Weekday

5

First heating period, start of NORMAL heating

6

First heating period, start of REDUCED heating

7

Second heating period, start of NORMAL heating

8

Second heating period, start of REDUCED heating

9

Third heating period, start of NORMAL heating

10

Third heating period, start of REDUCED heating

11 Holiday period 1…8

12 Date of first day of holidays

13 Date of last day of holidays

14 Heating curve, flow setpoint at 15 °C outside temperature

15 Heating curve, flow setpoint at –5 °C outside temperature

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)

- (1…8)

--.-- (01.01…31.12)

--.-- (01.01…31.12)

30 (20…70)

60 (20…120)

Unit

°C

°C

°C hh:mm hh:mm hh:mm hh:mm hh:mm hh:mm dd:MM dd:MM

°C

°C

5.2 Setpoints

5.2.1 General

The setpoint of the NORMAL and the REDUCED temperature and of frost protection for the plant / holiday mode are entered directly in °C room temperature. They are independent of whether or not the control uses a room temperature sensor.

5.2.2 Frost protection for the building

The lowest valid room temperature setpoint always corresponds to at least the setpoint of frost protection / holiday mode (setting on operating line 3), even if lower values have been entered as the setpoints of the NORMAL and the REDUCED temperature (settings on operating lines 1 and 2).

If a room temperature sensor is used and the room temperature falls below the holiday

/ frost protection setpoint, ECO – if available – will stop OFF until the room temperature has risen 1 °C above the holiday / frost protection setpoint.

5.3 Heating program

The heating program of the RVL480 provides a maximum of three heating periods per day. Also, every weekday may have different heating periods.

The entries to be made are not switching times, but periods of time during which the

NORMAL temperature shall apply. Usually, these periods of time are identical to the building's occupancy times. The actual switching times for the change from the

REDUCED to the NORMAL temperature, and vice versa, are calculated by the optimization function, provided it is activated.

Using the setting "1-7" on operating line 4, it is possible to enter a heating program that applies to all days of the week. This simplifies the settings: if the weekend settings differ from the other weekday settings, first enter the times for the entire week, then make the settings for days 6 and 7.

The entries are sorted and overlapping heating periods combined.


5 Function block "End-user space heating"

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5.4 Holiday program

A maximum of eight holiday periods per year can be programmed. At 00:00 of the first day of the holiday period, changeover to the setpoint of frost protection / holiday mode takes place. After 24:00 of the last day of the holiday period, the RVL480 will change to

NORMAL or REDUCED mode in accordance with the time switch settings.

The settings of each holiday period will be cleared as soon as the respective period has elapsed. The holiday periods may overlap. It is not necessary to observe a certain order.

The holiday program is only activated in AUTO mode.

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Siemens


6 Function block "End-user general"

This function block contains settings that the end-user himself may make, as well as fault indication.



38 Time of day

39 Weekday

40 Date

41 Year

50 Faults


00:00…23:59

Display function

(01.01…31.12)

(1995…2094)

Display function

Unit

hh:mm dd:MM jjjj

6.2 Time of day and date

The RVL480 has a yearly clock to enter the time of day and the date.

The weekday on line 39 is set automatically with the date and cannot be adjusted.

The changeover from summer- to wintertime, and vice versa, is automatic. Should the respective regulations change, the changeover dates can be adjusted (refer to chapter "13 Function block "Service functions and general settings"").

6.3 Indication of faults

The following faults are indicated:

Number Fault

10

30

40

42

60

61

62

81

82

100

120

140

142

Fault outside sensor

Fault flow temperature sensor

Fault return temperature sensor (primary circuit)

Fault return temperature sensor (secondary circuit)

Fault room temperature sensor

Fault room unit

Wrong room unit connected

Short-circuit on the bus (LPB)

Same bus address assigned several times (LPB)

Two clock masters on the bus (LPB)

Flow alarm

Inadmissible bus address or plant type (LPB)

Wrong partner unit (RVL479 only)

If a fault occurs, the LCD displays .

In interconnected plants, the address (device and segment number) of the controller causing the fault is indicated on all the other controllers, but no address is displayed on the controller causing the fault.

Example of display in interconnected plants:

50 = operating line

10 = error number

2 = device number

03 = segment number

The fault status signal disappears only after rectification of the fault. There will be no acknowledgment.


6 Function block "End-user general"

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7 Function block "Plant type"

This function block only contains the entry of the type of plant.

7.1 Operating line


51 Plant type


1 (1…6)

Unit

7.2 General

When commissioning the plant, the respective plant type must be entered first. This ensures that the functions required for the specific type of plant, the parameters and operating lines for the settings and displays will be activated.

All plant-specific variables and operating lines that are available for the other plant types will then be dead.

Example (selection of plant type no. 2):

51 = operating line

2 = plant type

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Siemens


8 Function block "Space heating"

This function block provides the ECO function, the optimization functions with boost heating and quick setback, as well as the room temperature influence.



61 Heating limit for NORMAL heating (ECO day)

62 Heating limit for REDUCED heating (ECO night)

63 Building time constant

64 Quick setback

65 Source of the room temperature

66 Type of optimization

67 Maximum heating-up time

68 Maximum optimum shutdown

69 Maximum limitation of room temperature

70 Gain factor for room temperature influence

71 Boost of room temperature setpoint

72 Parallel displacement of heating curve

73 Type of heating curve adjustment


17.0 (--.- /

−

5.0…+25.0)

5.0 (--.- /

−

5.0…+25.0)

20 (0…50)

1 (0 / 1)

A (0 / 1 / 2 / 3 / A)

0 (0 / 1)

00:00 (00:00…42:00)

0:00 (0:00…6:00)

--.- (--.- / 0…35)

4 (0…20)

5 (0…20)

0.0 (

−

4.5…+4.5)

0 (0…2)

Unit

°C

°C h hh:mm h:mm

°C

°C

°C

8.2 ECO function

The ECO function controls the heating system depending on demand. It gives consideration to the development of the room temperature depending on the type of building construction as the outside temperature varies. If the amount of heat stored in the building is sufficient to maintain the room temperature setpoint currently required, the

ECO function will switch the heating off.

Using the ECO function, the heating system operates only, or consumes energy only when required.

8.2.1 Compensating variables and auxiliary variables

The ECO function takes into account the development of the outside temperature and the heat storage capacity of the building.

The following variables are taken into consideration:

•

The building time constant. This is the measure of the type of building construction and indicates how quickly the room temperature in the building would change if the outside temperature was suddenly changed. The following guide values can be used for setting the building time constant:

10 h for light building structures

25 h for medium building structures

50 h for heavy building structures

•

The actual outside temperature (T

A

)

•

The composite outside temperature (T

AM

); it is the mean value of

− the actual outside temperature and

− the outside temperature filtered by the building time constant

In comparison with the actual outside temperature, the composite outside temperature is attenuated. Hence, it represents the effects of short-time outside temperature variations on the room temperature as they often occur during intermediate seasons

(spring time and autumn)

•

The attenuated outside temperature (T

AD

). It is generated by filtering twice the actual outside temperature by the building time constant. This means that, in comparison with the actual outside temperature, the attenuated outside temperature is considerably dampened.

This ensures that no heating will be provided in the summer when, under normal cir-


8 Function block "Space heating"

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cumstances, the heating would be switched on because the outside temperature drops for a few days.

T

A

(B9 or BUS)

T

A k t

T

AM k t

T

AD

Generation of the composite and attenuated outside temperature

T

A

Actual outside temperature

T

AD

Attenuated outside temperature

T

AM

Composite outside temperature kt Building time constant

T

A

25

T

A

20

T

AD

15

T

AM

10

5

0

Development of the actual, composite and attenuated outside temperature

T

A


T

AD

Attenuated outside temperature

T

AM

Composite outside temperature t Time t

8.2.2 Heating limits

Two heating limits can be set:

•

"ECO day" for NORMAL heating

•

"ECO night" for the lower temperature level; this may be REDUCED heating or OFF

(holidays / frost protection)

In both cases, the heating limit is the outside temperature at which the heating shall be switched on and off. The switching differential is 1 °C.

Switching the heating off

8.2.3 Mode of operation

The heating will be switched off when one of the three following conditions is satisfied:

•

The actual 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, it is assumed that the amount of heat entering the building envelope from outside or the amount of heat stored in the building structure will be sufficient to maintain the required room temperature level.

When the ECO function has switched the heating off, the display shows

ECO

.

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Switching the heating on

The heating will be switched on again only when all three of the following conditions are satisfied:

•

The actual outside temperature has fallen 1 °C below the current ECO heating limit

•

The composite outside temperature has fallen 1 °C below the current ECO heating limit

•

The attenuated outside temperature has fallen 1 °C below the "ECO day" heating limit

8.2.4 Operating modes and operational statuses

The ECO function is provided depending on the operating mode:

Operating mode or operating state ECO function Current heating limit

Automatic mode

Active

Continuously REDUCED heating Active

Continuously NORMAL heating

Protection / holiday mode

Manual operation

Inactive

Active

Inactive

ECO day or ECO night

ECO night

–

ECO night

–

8.3 Room temperature source

The room temperature source can be selected on operating line 65.

The following settings are possible:

Operating line 65

0

1

2

3

A

Room temperature source

No room temperature sensor

Room unit connected to terminal A6

Room temperature sensor connected to terminal B5

Average value of devices connected to terminals A6 and B5

Automatic selection

Line 65 also displays the room temperature source effectively used by the controller

(indicated by ACTUAL):

ACTUAL = 0 Controller uses no sensor

ACTUAL = 1 Controller uses the room unit connected to terminal A6

ACTUAL = 2 Controller uses the room temperature sensor connected to terminal B5

ACTUAL = 3 Controller operates with the average value delivered by the devices connected to terminals A6 and B5

Siemens


8.4 Optimization

8.4.1 Definition and purpose

Operation is optimized. EN 12098 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 will always be ensured

•

the smallest possible amounts of energy will be used to achieve this objective

8.4.2 Fundamentals

It is possible to select or set:

•

The type of optimization: either with a room temperature sensor/room unit or based on the room model

•

The maximum limit value for the heating-up time

•

The maximum limit value for optimum shutdown

•

Quick setback: yes or no



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With a room temperature sensor

Without a room temperature sensor

To perform the optimization function, the controller makes use of the actual room temperature – acquired by a room temperature sensor or room unit – or the room model.

Using a room temperature sensor or room unit, it is possible to have optimum start control and optimum stop control. To be able to optimally determine the switch-on and switch-off points, optimization needs to "know" the building's heating up and cooling down characteristics, always in function of the prevailing outside temperature. For this purpose, optimization continually acquires the room temperature and the respective outside temperature. It captures these variables via the room temperature sensor and the outside sensor and continually adjusts the forward shift of the switching points. In this way, optimization can also detect changes made to the building and to take them into consideration.

The learning process always concentrates on the first heating period per day.

When no room temperature sensor is used, the room model only allows optimum start control.

Optimization operates with fixed values (no learning process), based on the set maximum heating up time and the room model.

8.4.3 Process

T

R

T

Rw

0,5 °C

T

Rw

T

Rw

T

Rx

T

Rw

HP

HP t t1 t2 t3

Heating program

Time

Forward shift for early shutdown

Forward shift for start of heating -up

Quick setback

T

Rw

Setpoint

T

Rw

Room temperature setpoint of NORMAL heating

T

Rw

Room temperature setpoint of REDUCED hea ting

∆

T

Rw

Setpoint boost (only with boost heating)

T

Rx

Actual value

TR Room temperature

t

8.4.4 Room model temperature

To ascertain the room temperature generated by the room model, a distinction must be made between two cases:

•

The RVL480 is not in quick setback mode:

The room temperature generated by the room model is identical to the actual room temperature setpoint

•

The RVL480 is in setback mode:

The room temperature generated by the room model is determined according to the following formula:

Room model temperature T

RM

= (T

Rw t

– T

AM

) × e

3 × k t

+ T

AM

[°C]

Development of the room temperature as generated by the room model

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T

R

T

Rw

T

R M

T

R w

T

R w t

1 e 2.1828 (basis of natural logarithms) kt Building time constant in hours t Time in hours t

1

Quick setback

T

AM

Composite outside temperature

t

T

R

Room temperature

T

RM

Room model temperature

T

Rw

Setpoint of the normal room temperature

T

Rw

Setpoint of the reduced room temperature

8.4.5 Optimum stop control

During the building’s occupancy times, the RVL480 maintains the setpoint of NORMAL heating. Toward the end of the occupancy time, the control switches to the REDUCED setpoint. Optimization calculates the changeover time such that, at the end of occupancy, the room temperature will be 0.5 °C below the setpoint of NORMAL heating

(optimum shutdown).

By entering 0 hours as the maximum optimum shutdown, optimum stop control can be deactivated.

8.4.6 Quick setback

When changing from the NORMAL temperature to a lower temperature level

(REDUCED or holidays / frost), the heating will be shut down. And it will remain shut down until the setpoint of the lower temperature level is reached.

•

When using a room temperature sensor, the effective actual value of the room temperature is taken into account

•

When using no room temperature sensor, the actual value is simulated by the room model

The duration of quick setback is determined according to the following formula:

T - T t = 3 × kt × (ln ) [h]

T

Rw

- T

AM ln Natural logarithm kt t

Building time constant in h

Duration of setback

TAM Composite outside temperature

T

Rw

Setpoint of the NORMAL room temperature

T

Rw

Setpoint of the RE DUCED room temperature

8.4.7 Optimum start control

During the building’s non-occupancy times, the RVL480 maintains the setpoint of

REDUCED heating. Toward the end of the non-occupancy time, optimization switches the control to boost heating. This means that the selected boost will be added to the room temperature setpoint. Optimization calculates the changeover time such that, at the start of occupancy, the room temperature will reach the setpoint of NORMAL heating.

When the room temperature is simulated by the room model, that is, when using no room temperature sensor, the forward shift in time is calculated as follows: t = (T

Rw kt

– T

RM

) × 3 × kt [ min ]

Building time constant in h t Forward shift

T

Rw


T

RM


Optimum start control with the room model takes place only if a quick setback was previously effected.

Optimum start control can be deactivated by entering 0 hours as the maximum heating- up period.



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Duration of boost:

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8.4.8 Boost heating

For boost heating, a room temperature setpoint boost can be set. After changeover to the NORMAL temperature, the higher room temperature setpoint applies, resulting in an appropriately higher flow temperature setpoint.

T

R

T

Rw

T

Rw

T

Rw

T

Rw

T

Rx t

T

R

Time

Room temperature

T

Rw

Setpoint of NORMAL room temperature

T

Rw

Setpoint of REDUCED room temperature

T

Rx

Actual value of the room temperature

T

Rw

Room temperature setpoint

∆

T

Rw

Boost of room temperature setpoint (with boost heating)

t

•

When using a room sensor, boost heating is maintained until the room temperature has reached the setpoint of normal heating. Then, that setpoint is used again

•

When using no room sensor, the room model calculates how long boost heating will be maintained. The duration is determined according to the following formula: t

1

T

T

Rw

Rw

- T

- T

RM1

Rw kt

= 2 × [h]

20

The duration of the boost is limited to two hours.

T

R

T

Rw

T

Rw

T

Rw

T

RM

T

R w

T

RM1 t

1

t

kt t t

1

T

R

Building time constant in h

Time

Duration of room temperature setpoint boost with boost heating

Room temperature

T

Rw


T

Rw

Setpoint of the REDUCED room temperature

T

RM


T

RM1

Room model temperature at the start of boost heating

T

Rw


∆

T

Rw

Boost of room temperature setpoint with boost heating



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8.5 Room functions

8.5.1 Maximum limitation of the room temperature

For the room temperature, it is possible to have an adjustable maximum limitation, in which case a room temperature sensor is required (sensor or room unit). If the room temperature lies 1 °C above the limit value, the room temperature setpoint will be lowered by 4 °C.

Maximum limitation of the room temperature is independent of the setting used for the room temperature influence.

If the room temperature lies above the limit value, the display shows .

The reduction of the flow temperature setpoint

∆

T

Vw

is calculated as follows:

∆

T

Vw

=

∆

T

Rw

× (1 + s) [K]

T

Rw

Siemens


-1 -0,5 0,5 1 1,5 2 2,5 3

T

R

s

∆

T

∆

T

Rw

Reduction of room temperature setpoint

R

Heating curve slope

Deviation of room temperature from the limit value (actual value / limit value)

∆

T

Vw

Reduction of flow temperature setpoint

8.5.2 Room temperature influence

The room temperature is included in the control process, in which case a room temperature sensor is required (sensor or room unit).

The gain factor for the room temperature influence can be adjusted. This indicates to what extent deviations of the actual room temperature from the setpoint have an impact on flow temperature control:

0 = room temperature deviations have no impact on the generation of the setpoint

20 = room temperature deviations have a maximum impact on the generation of the setpoint

The reduction of the room temperature setpoint

∆

T

Rw

is calculated according to the following formula:

∆

T

Rw

VF

= × (T

2

Rw

- T

Rx

) [K]

T

R w

T

R

T

Rw

The change of the flow temperature setpoint resulting from the change of the room temperature setpoint is calculated as follows:

∆

T

Vw

=

∆

T

Rw

× (1 + s) [K]

s Heating curve slope

T

Rw

∆

T

Rw

–

∆

T

+

∆

T

Rw

Rw


Change of room temperature setpoint

Reduction of room temperature setpoint

Increase of ro om temperature setpoint

T

Rx

Actual value of room temperature

∆

T

R

Room temperature deviation (T

Rw

– T

Rx

)

∆

T

Vw

Change of flow temperature setpoint

VF Gain factor



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Settings with the bar

8.6 Heating curve

8.6.1 Purpose

With the space heating systems (plant types 1, 2 and 3), flow temperature control is always weather-compensated. Assignment of the flow temperature setpoint to the prevailing outside temperature is made via the heating curve.

.

8.6.2 Basic setting

The basic setting of the heating curve is made with the little bar or via two operating lines (also refer to section "19.1.2 Analog operating elements")

The following settings are required:

•

The flow temperature setpoint at –5 °C outside temperature

•

The flow temperature setpoint at +15 °C outside temperature

The basic setting during commissioning is made according to the planning documentation or in agreement with local practices.

Settings on operating lines

Selection of setting

The settings are made on operating lines 14 and 15:

Operating line Setpoint

14 Flow temperature setpoint at an outside temperature of +15 °C

15 Flow temperature setpoint at an outside temperature of –5 °C

The kind of setting can be selected on operating line 73:

Operating line 73 Bar

0

1

2

Active

Operating line 14

Inactive

Inactive Active

Inactive Display function only, readjustment only via LPB

Operating line 15

Inactive

Active

Display function only, readjustment only via LPB

8.6.3 Deflection

The heat losses of a building are proportional to the difference between room temperature and outside temperature. By contrast, the heat output of radiators does not increase proportionally when the difference between radiator and room temperature increases.

For this reason, the radiators' heat exchanger characteristic is deflected. The heating curve's deflection takes these properties into consideration.

In the range of small slopes (e.g. with underfloor 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.

The slope s is determined according to the following formula:

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T

Vw(-5)

- T

20 K

Vw(+15) s Heating curve slope

T

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

On the controller, the heating curve is set as a straight line, but the straight line corresponds exactly to the deflected heating curve, because a non-linear outside temperature scale corresponds to the deflection.

The heating curve is valid for a room temperature setpoint of 20 °C.

8.6.4 Parallel displacement of heating curve

The heating curve can be displaced parallel:

•

Manually with the setting knob for room temperature readjustments. The readjustment can be made by the end-user and covers a maximum range of –4.5…+4.5 °C room temperature

•

Manually on operating line 72

This parallel displacement of the heating curve is calculated as follows:

Parallel displacement

∆

T

Flow

= (

∆

T

Knob

+

∆

T

Operating line 72

) × (1 + s)

T

V

100

90

80

70

60

50

40

30

30

20

10 0

10

10

0

0

T

R w

Parallel displacement of the heating curve s Slope

T

A

Outside temperature

T

V

Flow temperature

T

WR


-10 -20 -30

T

A

8.6.5 Display of setpoints

Two setpoints result from the basic setting, the position of the setting knob and – if made – the entry on operating line 72, which can be called up on operating line 166:

•

Resulting flow temperature setpoint at an outside temperature of +15 °C

•

Resulting flow temperature setpoint at an outside temperature of –5 °C

These two current setpoints determine the actual heating curve from which – in function of the composite outside temperature – the current flow temperature setpoint is generated. It can be called up on operating line 165 (also refer to chapter "13. Function block

"Service functions and general settings"").

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8.7 Generation of setpoint

8.7.1 Weather-compensated control

Weather-compensated control is used with plant types 1, 2 and 3.

The setpoint can be generated in two different ways:

•

In function of the outside temperature via the heating curve (for setting, refer to section “8.6 Heating curve". The temperature used is the composite outside temperature

•

Manual preselection of a constant setpoint. This is accomplished by bridging terminals H2–M. It is possible to choose whether the setpoint shall be absolute or used as a minimum limit value (refer to chapter "13 Function block "Service functions and general settings"")

SYNERGYR

OZW30

20 °C

Setting knob room unit*

Room setpoint

, oder

Operating line

1, 2 oder 3

1 + s

Flow temperature setpoint T

Vw

Composite outside temperature s

Heating curve

1 + s

Setpoint on operating line 165

Parallel displacement of heating curve, operating line 72

Setting knob on controller

LPB

LPB Data bus

OZW30 SYNERGYR central unit s Slope

* Active only with room unit level

The impact of the central unit OZW30 is described in section "17.2 Combination with

SYNERGYR central unit OZW30".

8.7.2 Demand-compensated control

Demand-compensated control is used with plant types 4, 5 and 6. The setpoint is delivered to the RVL480 via LPB in the form of a heat demand signal. In that case, the outside temperature will not be taken into consideration.

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9 Function block "3-position actuator heating circuit"

This function block provides 3-position control. Depending on the type of plant, it acts as follows:

•

Weather-compensated, on the mixing valve of a space heating system

(plant type 1)

•

Weather-compensated, on the valve in the primary return of a space heating system with a district heat connection (plant type 3)

•

Demand-compensated, on the mixing valve of a main flow (plant type 4)

•

Demand-compensated, on the valve in the primary return of a main flow with a district heat connection (plant type 6)



81 Maximum limitation of flow temperature

82 Minimum limi tation of flow temperature

83 Maximum rate of flow temperature increase

84 Excess temperature mixing valve / heat exchanger

85 Actuator running time

86 P-band of control (Xp)

87 Integral action time of control (Tn)


--- (--- / 0…140)

--- (--- / 0…140)

--- (--- / 1…600)

10 (0…50)

120 (30…873)

32.0 (1…100)

120 (30…873)

Unit

°C

°C

°C/h

°C s

°C s

9.2 Limitations

9.2.1 Limitations of the flow temperature

The following limitations can be set:

•

Maximum limitation of flow temperature: at the limit value, the heating curve runs horizontal. This means that the flow temperature setpoint cannot exceed the maximum value

•

Minimum limitation of flow temperature: at the limit value, the heating curve runs horizontal. This means that the flow temperature setpoint cannot fall below the minimum value

If the setpoint is limited, the display shows:

= for maximum limitation

= for minimum limitation

Both limitations can be deactivated (setting ---).

9.2.2 Setpoint increase

T

Vw

Maximum slope =

∆

T

Vw

∆ t

T

Vw t t Time

∆ t Unit of time

T

Vw

Flow temperature setpoint

∆

T

Vw

Setpoint rise per unit of time

t


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The rate of increase of the flow temperature setpoint can be limited to a maximum. In that case, the maximum rate of increase of the flow temperature setpoint is the selected temperature per unit of time (°C per hour).

This function

•

prevents cracking noise in the piping

•

protects objects and construction materials that are sensitive to quick temperature increases (e.g. antiquities)

•

prevents excessive loads on heat generating equipment

This function can be deactivated (setting ---).

9.3 3-position control

3-position control operates as weather- or demand-compensated PI flow temperature control. The flow temperature is controlled through the modulating regulating unit (slipper or seat valve). Thanks to the I-part, there is no control offset.

The control's positioning commands to the actuator of the regulating unit are fed to the output relays and indicated by LEDs.

9.4 Excess mixing valve temperature

In interconnected plants, an excess mixing valve temperature can be entered on the

RVL480. This is a boost of the heating zone's flow temperature setpoint. The higher setpoint is delivered to the heat generating equipment as the heat demand signal.

The excess mixing valve temperature can only be set on controllers driving a mixing valve (controller N2 in the example below, operating line 84).

Example: w

N2 +

w w

N1

= w

N2

+ w

BUS (LPB) w

N2

w

N2

N1 Boiler temperature controller (heat generation)

N2 Flow temperature controller (heating zone) w

N1

Setpoint of the boiler temperature controller w

N2

Setpoint of the flow temperature controller

∆ w Excess mixing valve temperature (to be set on controller N2)

9.5 Pulse lock

If the actuator receives only closing or opening pulses for a period of time equivalent to five times the actuator running time, all additional pulses delivered by the controller will be locked, thus reducing the strain on the actuator.

For safety reasons however, the controller delivers pulse in the opposite direction at

10-minute intervals.

A pulse in the opposite direction negates the pulse lock.

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10 Function block "Boiler"

Function block "Boiler" acts as a 2-position controller and is used for direct burner control. Depending on the type of plant, it acts as a

•

boiler temperature controller for weather-compensated control of a space heating system (plant type 2)

•

boiler temperature controller for demand-compensated control of a main flow (plant type 5)



91 Operating mode of boiler

92 Maximum limitation of boiler temperature

93 Minimum limitation of boiler temperature

94 Switching differential

95 Minimum burner running time

96 Release limit for second burner stage

97 Reset limit for second burner stage

98 Waiting time second burner stage

99 Operating mode pump M1


0 (0 / 1)

95 (25…140)

10 (5…140)

6 (1…20)

4 (0…10)

50 (0…500)

10 (0…500)

20 (0…40)

1 (0 / 1)

Unit

°C

°C

°C min

°C×min

°C×min min

10.2 Operating mode

When there is no demand for heat (e.g. due to the ECO function), three different boiler operating modes are available:

•

With manual shutdown: the boiler will be shut down when there is no demand for heat and operating mode protection is selected (setting 0 on operating line 91)

•

With automatic shutdown: the boiler will be shut down when there is no demand for heat, irrespective of the selected operating mode (setting 1 on operating line 91)

Boiler operating modes, when there is no demand for heat:

Controller's operating mode

Boiler operating mode with manual shutdown

Protection Boiler OFF

with automatic shutdown

Boiler OFF

AUTO

Boiler at minimum limit value Boiler OFF

REDUCED Boiler at minimum limit value Boiler OFF

NORMAL Boiler at minimum limit value Boiler OFF

With plant type 5, it is not possible to select all operating modes (refer to section "3.4

Operating modes ").

When there is demand for heat, the boiler always supplies heat, which means that the boiler's operating mode will always be ON.

10.3 Limitations

10.3.1 Maximum limitation of the boiler temperature

For maximum limitation of the boiler temperature, the maximum limit value can be adjusted. The switch-off point cannot exceed the maximum limit value. The switch-on point will then be lower by the amount of the set switching differential.

If the boiler temperature is limited, the display shows .

These limitations cannot be used as safety functions. For that purpose, thermostats, thermal reset limit thermostats, etc., must be used.


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10.3.2 Minimum limitation of the boiler return temperature

For minimum limitation of the boiler temperature, a minimum limit value can be adjusted. The switch-on point cannot fall below the minimum limit value. The switch-off point will then be higher by the amount of the set switching differential.

If the return temperature is limited, the display shows .

10.4 2-Position control

2-Position control controls the boiler temperature by switching a single- or 2-stage burner on and off.

The control's commands to the burner or burner stages are fed to the output relays and indicated by LEDs.

10.4.1 Control with a single-stage burner

For 2-position control with a single-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 below the setpoint by half the switching differential, the burner will be switched on. If the boiler temperature exceeds the setpoint by half the switching differential, the burner will be switched off.

0,5×SD 0,5×SD

ON

OFF

T

Kw

SD Switching differential

T

K

Boiler temperature

T

Kw

Boiler temperature setpoint

T

K

If there is no more deviation before the minimum burner running time has elapsed, the burner will nevertheless remain activated until that time is completed (burner cycling protection). This means that the minimum burner running time has priority, provided the boiler temperature will not exceed the maximum limit, which will always lead to burner shutdown.

T

K

T

Kx

T

Kw

+ 0,5×SD

T

Kw

T

Kw

- 0,5× SD

Y

B

1

t

0

SD Switching differential t Time

T

K

Boiler temperature w

TK

Boiler temperature setpoint x

TK

Actual value of the boiler temperature

Y

B

Burner control signal

When controlling a single-stage burner, the reset limit of the second stage should be set to zero.



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Setting parameters

Control

10.4.2 Control with a 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 – which now apply to both stages – plus the following variables:

•

The release limit (FGI) for the second stage. This is the variable generated from the temperature (T) and the time (t). If the maximum limit is exceeded, the second burner stage is released and can switch on, provided the minimum waiting time for the second stage has elapsed

FGI =

t

0

∫

∆

T dt

where:

∆

T = ( w

−

0.5 × SD

−

x ) > 0

•

The reset limit (RSI). This is the variable generated from the temperature (T) and the time (t). If the maximum limit is exceeded, the burner will be locked and switches off

RSI =

t

0

∫

∆

T dt

where:

∆

T = ( x

−

w + 0.5 × SD ) > 0

•

The minimum locking time for the second stage, that 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 flow temperature setpoint. If it falls below the setpoint by half the switching differential

(x < w – 0.5 × SD), the first burner stage will be switched on. At the same time, the minimum waiting time for the second burner stage is started and the release limit (int egral) is being generated. The controller ascertains for how long and by how much the flow temperature remains below w – 0.5 × SD. It continually generates the release limit based on the time and the temperature.

If, on completion of the minimum locking time, the flow temperature lies below w – 0.5 × SD, and if the release limit reaches the set maximum limit, the second burner stage will be released and switched on. The flow temperature starts rising.

When the flow temperature has exceeded the setpoint by half the switching differential

(x = w + 0.5 × SD), the second burner stage is switched off again, but will remain released. The first stage continues to operate. If the flow temperature drops, the second stage will be switched on again at x < w – 0.5 × SD. The setpoint is now maintained by the second burner stage.

If, however, the flow temperature continues to rise (x > w + 0.5 × SD), the controller starts generating the reset limit (integral). It determines for how long and to what extent the flow temperature stays above the setpoint by half the switching differential. It continually generates the reset limit based on the time and the temperature. When the reset limit reaches the set maximum limit, the second burner stage will be locked and the first stage switched off.

The minimum waiting time and the calculation of the release limit 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 switched on or off.

SD Switc hing differential w Boiler temperature setpoint x Actual value of boiler temperature

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T

Kx

T

K w

+ 0,5

*

SD

T

Kw

- 0,5

*

SD t

Y

B1

1

0 t

INT max.

max.

FGI

RSI

RSI

0 t

FG

B2

1

0 t

Y

B 2

1

0

FG

B2

Release of burner stage 2

FGI Release limit

INT Integral

RSI Reset limit

SD Switching differential t Time

T

Kw

Boiler temperature setpoint

T

Kx

Actual value of the boiler temperature

Y

B1

Control signal for burner stage 1

Y

B2

Control signal for burner stage 2 t

10.4.3 Frost protection for the boiler

Frost protection for the boiler uses fixed values:

•

Switch-on point: 5 °C boiler temperature

•

Switch-off point: minimum limit of boiler temperature plus switching differential

If the boiler temperature falls below 5 °C, the burner will always be switched on until the boiler temperature has crossed the minimum limit by the amount of the switching differential.

10.4.4 Protective boiler startup

If, while the burner is running, the boiler temperature falls below the minimum limit of the boiler temperature, the differential (minimum limit value minus actual value) will be integrated. From this, a critical locking signal will be generated and transmitted to the connected loads. This causes the loads to reduce their setpoints, thus consuming less energy. If the critical locking signal exceeds a defined value, the boiler pump will be deactivated also.

If the boiler temperature returns to a level above the minimum limit, the integral will be reduced, resulting in a reduction of the critical locking signal. If the integral reaches a defined limit, the boiler pump will be activated again, and the connected loads raise their setpoints again.

When the integral reaches the value of zero, protective boiler startup will be deactivated, in which case the critical locking signal is zero.

If the boiler effects protective boiler startup, the boiler temperature controller's display shows .

Protective boiler startup cannot be deactivated.

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Section "13.4.7 Gain of locking signal" provides information on who receives the boiler temperature controller's critical locking signal and how the loads respond to it.

Individual unit:

Controller 1

Plant type 2

Controller 1 generates a critical locking signal which deactivates the heating circuit pump

Interconnected plant:

Critical locking signal

LPB

Controller 1

Plant type 5

Controller 1 switches boiler pump off

Controller 2

Controller 3


10.4.5 Protection against boiler overtemperatures

To prevent heat from building up in the boilers (protection against overtemperatures), the RVL480 offers a protective function.

When the first burner stage is switched off, the controller allows the boiler pump to overrun for the set pump overrun time (operating line 174 on the boiler temperature controller), generating at the same time a forced signal to all loads (inside the controller on the data bus). If the boiler temperature controller is located in segment 0, the forced signal will be delivered to all loads in all segments. By contrast, if the boiler temperature controller is located in segment 1…14, the signal will only be sent to the loads in the same segment.

Y

Off

Boiler controller, stage 1

Pump

Forced signal

Overrun time of boiler pump t t Time

Y Control signal boiler pump

All loads (heating and d.h.w. circuits) and heat exchangers that abruptly reduce their demand for heat watch 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 loads and the heat exchanger only allow pump overrun to take place (refer to section "13.4.4 Pump overrun")

•

If, in this time window, a forced signal is received, the loads continue to draw heat from the boiler in the following manner:

−

Plant types with heating circuits using a mixing valve maintain the previous set-

− point

Plant types with pump heating circuits allow the pumps to continue running

If the boiler sets the forced signal to zero, the loads and heat exchanges that have responded to the forced signal respond as follows:

•

They close the slipper or seat valves

•

Their pumps run for the set pump overrun time and then stop

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10.5 Operating mode of pump M1

The operating mode during protective boiler startup of the pump M1 must be selected on operating line 99:

•

Circulating pump with no deactivation (setting 0):

The circulating pump runs when one of the consumers calls for heat and when burner stage 1 is switched on, that is, also during protective boiler startup.

•

Circulating pump with deactivation (setting 1):

The circulating pump runs when one of the consumers calls for heat. It is deactivated during protective boiler startup.

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11 Function block "Setpoint of return temperature limitation"

On the function block "Setpoint of return temperature limitation", the setpoint of minimum limitation of the return temperature or the constant value for shifting maximum limitation of the return temperature can be adjusted.



101 Minimum limitation of return temperature


--- (--- / 0…140)

Unit

°C

11.2 Description

On operating line 101, the setpoint resp. the constant value is adjusted on operating line 101. When entering ---, the function is deac tivated, which means that the return temperature will not be limited.

For more detailed information about these functions, refer to chapter “12 Function block

"District heat"”.

If the settings of this function block have been locked (contact H3 or on operating line 248), the display shows when pressing buttons and .

11.3 Minimum limitation of the return temperature

This function block ensures minimum limitation of the boiler return temperature where possible or required. This applies to the following plant types:

•

Plant type no. 1, Heating circuit control with mixing group

•

Plant type no. 4, Precontrol with mixing group, heat demand signal via data bus

•

Plant type no. 5, Precontrol with boiler, heat demand signal via data bus

Minimum limitation of the boiler return temperature prevents boiler corrosion resulting from flue gas condensation.

11.3.1 Acquisition of the measured values

A temperature sensor with a sensing element LG-Ni 1000 is required in the return. With plant type no. 1, the return temperature can also be delivered via LPB. In interconnected plants, only one return temperature sensor per segment may be used.

11.3.2 Mode of operation

If the return temperature falls below the set minimum limit value, the temperature differential between minimum limit value and actual value will be integrated. From this, a critical locking signal will be generated and transmitted to the connected loads. This causes the loads to reduce their setpoints, thus consuming less energy.

If the return temperature returns to a level above the minimum return temperature limit, the integral will be reduced, resulting in a reduction of the critical locking signal, and connected loads raise their setpoints again.

When the integral reaches the value of zero, the minimum return temperature limitation will be deactivated, 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.

Section provides 13.4.7 “Gain of locking signal” information on which the critical locking signal is sent to and how the loads respond to it.

The minimum limit value is to be set on operating line 101. Setting --- = inactive.


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Central impact of limitation

Local impact of limitation

11.3.3 Mode of operation with a single unit (with no bus)

Controller 1

Boiler controller

Controller 2

Plant type 1

Controller 2 generates a critical locking signal which closes the mixing valve

No facility for min.

limitation of return temp.

Setting operating line 101 = 50 °C, return temp. sensor connected

11.3.4 Mode of operation in interconnected plants


Controller 1

Plant type 5

Setting operating line 101 = 50 °C, return temperature sensor connected

LPB


Controller 1

Boiler controller

(no facility for min. limitation of return temp.)

LPB

Controller 2

Plant type 1

Controller 2 closes the mixing valve

Setting operating line 101 = - - - , no own return temp. sensor connected

Controller 3

Plant type 1

Controller 3 closes the mixing valve

Setting operating 101 = - - - , no own return temp. sensor connected

Controller 2

Plant type 1

Controller 2 limits return temp. to 50 °C

Setting operating line 101 = 50 °C, return temp. sensor connected

Controller 3

Plant type 1

Controller 3 limits return temp. to 40 °C

Return temperature signal

Setting operating line 101 = 40 °C, no own return temp. sensor connected

The group controller with its own return temperature sensor (plant type 1) passes the return temperature to the other zone controllers in the same segment, which can provide minimum limitation of the return temperature on a local basis, depending on the settings made. This means they generate a critical locking signal internally.

For response to critical locking signals, refer to section "13.4.7 Gain of locking signal".

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12 Function block "District heat"

Together with function block "3-position controller", this function block provi des flow temperature control in plants with an indirect (heat exchanger) or direct district heat connection.

Depending on the type of plant, it acts as a

•

flow temperature controller for weather-compensated control of a space heating system with a district heat connection (plant type 3)

•

precontroller for demand-compensated control of a main flow (plant type 6)

If the settings of this function have been locked (contact H3 or on operating line 248), the display shows when pressing buttons and .



112 Maximum limitation of return temperature, slope

113 Maximum limitation of return temperature, start of shifting limitation

114 Maximum limitation of return temperature Integral action time

115 Maximum limitation of return temperature diffe rential

116 Minimum stroke limitation (Y min

function)


0.7 (0.0…40)

10 (

−

50…+50)

30 (0…60)

--.- (--.- / 0,5…50)

6 (-- / 1…20)

Unit

°C min

°C min

12.2 Limitations

Purpose

Note

Generation of maximum limit value

12.2.1 Secondary flow temperature

Refer to section "9.2.1 Limitations of the flow temperature".

12.2.2 Maximum limitation of primary return temperature

The primary return temperature uses maximum limitation to

•

make certain that too hot water will not be fed back to the district heat utility

•

minimize performance losses of the utility

•

comply with the utility’s regulations

The maximum limitation of the primary return temperature is inactive upon d.h.w request via data bus.

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)

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 is calculated according to the following formula:

T

L

= T

L constant

+ [(T

L start

– T

A

) × s] [°C]

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Function

Function

Purpose

T

PR

90

80

70

60

T

L constant s

50

40

30

T

L start

20

T

A

30 20 10 0 -10 s

T

A

Slope of limitation (operating line 112)


T

L constant

Constant value of limitation (operating line 101)

T

L start

Start of shifting limitation (operating line 113)

T

PR

Primary return temperature

The outside temperature is used as a compensating variable for maximum limitation of the primary return temperature. It can be delivered either by the local sensor or the

LPB.

Limitation operates according to the selected characteristic:

•

When the outside temperature falls, the return temperature will initially be limited to the constant value

•

If the outside temperature continues to fall, it will reach the selected starting point for shifting compensation. From this point, the limit value will be raised as the outside temperature falls. The slope of this section of the characteristic can be adjusted

Maximum limitation of the return temperature has priority over maximum limitation of the flow temperature.

This function can be deactivated on operating line 101.

If the return temperature is limited, the display shows .

12.2.3 Maximum limitation of the return temperature differential (DRT limitation)

For the differential of primary return and secondary return temperature, a maximum limitation can be set. For this purpose, a temperature sensor (sensing element

LG-Ni 1000) is required in the secondary return.

If the differential of the two return temperatures exceeds the adjusted maximum limit, the flow temperature setpoint will be reduced.

If maximum limitation of the return temperature differential is activated, the display shows .

DRT limitation has priority over minimum limitation of the flow temperature.

This function can be deactivated (setting --- on operating line 115).

Limitation of the return temperature differential

•

prevents idle heat resulting from excessive cooling down

•

optimizes the volumetric flow

•

is a dynamic return temperature limitation

•

shaves peak loads

•

ensures the lowest possible return temperatures

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Example of the effect of maximum limitation of the return temperature differential:

V

P

[%]

DRT

OFF

V

S

DRT on

100

90

80

70

60

50

40

30

20

10

0

t

DRT

ON

With activated maximum limitation

DRT

OFF

Without maximum limitation t Time

Volumetric flow on the primary side

V

S

Volume saved

12.2.4 Integral action time

With maximum limitation of the return temperature and maximum limitation of the return temperature differential, the integral action time determines the rate at which the flow temperature setpoint will be reduced:

•

Short integral action times lead to quick reductions

•

Long integral action times lead to slow reductions

With this setting, the impact of the limitation function can be matched to the type of plant.

12.2.5 Minimum limitation of stroke (suppression of hydraulic creep)

To avoid measurement errors in connection with heat metering due to extremely small flow rates, the flow through the two-port valve in the primary return can be limited to a minimum (Y min

function). If the valve is supposed to open below the minimum stroke position, it will be fully closed and remains closed until the set closing time has elapsed.

The first opening pulse after completion of the closing time will reopen the valve and the control resumes normal operation.

The stroke assigned to the minimum volumetric flow must be acquired by an auxiliary switch fitted in the actuator and delivered to the RVL480. When bridging terminals

H4–M, the valve will close and the waiting time starts.

Minimum limitation of the stroke has priority over all limitations.

If minimum stroke limitation is activated, the display shows .

12.2.6 Flow limitation

The RVL480 does not provide flow limitation.

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13 Function block "Service functions and general settings"

Function block "Service functions and general settings” is used to combine various displays and setting functions that are of assistance in connection with commissioning and service work. In addition, a number of extra functions are performed.

The service functions are independent of the type of plant. Function block Service functions and general settings



161 Outside temperature simulation

162 Relay test

163 Sensor test

164 Test of H-contacts

165 Flow temperature setpoint

166 Resulting heating curve

167 Outside temp. for frost protection for the plant

168 Flow temp. setpoint for frost protection for the plant

169 Device number

170 Segment number

171 Flow alarm

172 Operating mode when terminals H1 –M are bridged

173 Amplification of locking signal

174 Pump overrun time

175 Periodic pump run (pump kick)

176 Winter- / summertime changeover

177 Summer- / wintertime changeover

178 Clock operation

179 Bus power supply

180 Outside temperature source

181 Heat demand output Ux DC 0…10 V


--.- (--.- /

−

50…+50)

0 (0…4)

Display function

Display function

Display function

Display function

2.0 (--.- / 0…25)

15 (0…140)

0 (0…16)

0 (0…14)

--:-- (--:-- / 1:00…10:00) hh:mm

0 (0…3)

100 (0…200) %

6 (0…40)

0 (0 / 1)

25.03 (01.01…31.12)

25.10 (01.01…31.12) min dd:MM dd:MM

0 (0…3)

A (0 / A)

A (A / 00.01… 14.16)

130 (30…130)

Unit

°C

°C

°C

°C

13.2 Display functions

13.2.1 Flow temperature setpoint

Displayed is the current flow temperature setpoint which is composed of the following variables:

•

Flow temperature setpoint in function of the composite outside temperature and the heating curve

•

Position of the setting knob for room temperature readjustments

•

Parallel displacement of heating curve (setting on operating line 72)

With demand-compensated control (plant types 4, 5 and 6), the display shows --- .

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Generation of flow temperature setpoint:


T

AM

T

V

Heating curve

T

VS

T

AM s

T

VS

1 + s

T

Vw

Flow temperature setpoint, operating line 165

1 + s

Setting knob on controller s Slope

T

AM

Composite outside temperature

T

VS

Flow temperature setpoint (generated via the heating curve)

T

V

Flow temperature setpoint

13.2.2 Heating curve

The display shows the current heating curve which is composed of the following variables:

•

Basic setting of the little bar or on operating lines 14 and 15

•

Position of the setting knob for room temperature readjustments

•

Parallel displacement (setting on operating line 72)

•

The display also shows the two flow temperature setpoints:

•

TV1: current setpoint at an outside temperature of +15 °C

•

TV2: current setpoint at an outside temperature of –5 °C

With demand-compensated control (plant types 4, 5 and 6), the display shows --- ---.

Display of heating curve data:


T

V

TV2

S

Heating curve

1 + s

TV1

S

TV1

S

, TV2

S

TV1, TV2

TV1, TV2 operating line 166

+15 °C -5 °C

T

AM

1 + s

Setting knob on controller s Slope

TV1 Resulting flow temperature setpoint at an outside temperature of +15 °C

TV2 Resulting flow temperature setpoint at an outside temperature of –5 °C

TV…

S

Flow temperature setpoint (generated via the heating curve)

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13.3 Commissioning aids

13.3.1 Simulation of outside temperature

To facilitate commissioning and fault tracing, outside temperatures in the range of

–50 to +50 °C can be simulated. This simulation has an effect on the actual, the composite and the attenuated outside temperature.

Simulated T

A

= actual T

A

= composite T

A

= attenuated T

A

During the simulation, the actual outside temperature (as acquired by the sensor or via

LPB) will be overridden.

When the simulation is terminated, the actual temperature will gradually adjust the composite and the attenuated temperatures to their real values.

This simulation of the outside temperature causes therefore a reset of the composite and the attenuated outside temperatures.

There are three choices to terminate the simulation:

•

Entry of --.-

•

Leaving the setting level by pressing the Info button or any of the operating mode buttons

•

Automatically after 30 minutes

13.3.2 Relay test

Each of the three output relays can be energized. Depending on the type of plant, the following codings apply:

Entry Plants with a valve

(plant types no. 1, 3, 4 and 6)

0 Normal operation

Plants with a burner

(plant types no. 2 and 5)

Normal operation

1

2

All contacts open

Heating circuit valve fully OPEN (Y1)

All contacts open

Burner stage 1 ON (K4)

3

4

Heating circuit valve fully CLOSED (Y2) Burner stages 1 and 2 ON (K5)

Heating circuit pump/circulating pump Heating circuit pump/circulating

ON (M1) pump ON (M1)

There are four choices to terminate the relay test:

•

Entry of 0 on the operating line

•

Leaving the setting level by pressing button or

•

Leaving the setting level by pressing the Info button or any of the operating mode buttons

•

Automatically after 30 minutes

13.3.3 Sensor test

The connected sensors can be checked on operating line 163. In addition, if available, the current setpoints and limit values are displayed.

In the display, the current setpoints are identified by SET, the actual values by ACTUAL

(also refer to section "19.1 Operation ").

The six temperatures can be called up by entering 0…5:

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Entry Display SET

0

No display

Display ACTUAL

Actual value of outside sensor at termi-

1

Setpoint of flow / boiler temperature

With the plant types using a boiler, the switch-off point is displayed.

If there is no demand for heat, the display shows ---

Setpoint of room temperature. nal B9.

If the outside temperature is delivered via the data bus, the display shows ---

Actual value of flow / boiler temperature sensor at terminal B1

2

3

With the plant types with no heating circuit, no room temperature setpoint is displayed

Setpoint of room temperature.

With the plant types with no heating circuit, no room temperature setpoint is displayed

Limit value of return temperature.

With plant types no. 1, 4 and 5, the

minimum limit value of the return

Actual value of room temperature sensor at terminal B5

Actual value of room unit sensor at terminal A6

4

Actual value of primary return temperature sensor at terminal B7.

If the return temperature is delivered via

LPB, the display shows --- temperature is displayed; with plant types no. 3 and 6, the maximum limit value of the return temperature.

If no return temperature limitation is activated, the display shows ---

5

Limit value of return temperature differential.

If no DRT limitation is activated, the

Actual value of secondary return temperature sensor at terminal B71 display shows ---

Faults in the sensor measuring circuits are displayed as follows:

= short-circuit (thermostat: contact closed)

= open-circuit (thermostat: contact open)

13.3.4 Test of H-contacts

The connected H-contacts can be checked on operating line 164. It is always the current status that is indicated (contact open, contact closed).

The contacts can be individually selected by pressing and .

Entry Contact

H1 Overriding the operating mode (contact H1)

H2

H3

H4

Manually generated heat demand (contact H2)

Operating lock (contact H3)

Minimum limitation of stroke (contact H4)

The contact's status is displayed as follows:

= contact closed

= contact open

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13.4 Auxiliary functions

13.4.1 Frost protection for the plant

The plant can be protected against frost, provided the RVL480 and heat generation are ready to operate (mains voltage present!).

The following settings are required:

•

The actual outside temperature at which frost protection shall respond

•

The minimum flow temperature that shall be maintained by the frost protection function

0.5 °C 0.5 °C

ON

OFF

OpL 167

T

A

OpL167 Operating line 167

OFF Frost protection OFF

ON

T

A

Frost protection ON

Outside temperature

If the actual outside temperature falls below the limit value (setting on operating line

167 minus 0.5 °C), the RVL480 will switch the circulating pump (pump connected to terminal Q1) on and maintain the flow temperature at the selected minimum level. The control switches off when the outside temperature exceeds the limit value by 0.5 °C.

Frost protection for the plant can be deactivated.

13.4.2 Flow alarm

The fault alarm triggers a fault status message if the flow resp. the boiler temperature

(depending on the plant type) does not reach the required setpoint band (setpoint ± a defined switching differential) within a defined period of time – provided there is a demand for heat. This period of time can be set on operating line 171.

•

Plant types 1, 3, 4 and 6: Important is the temperature measured with sensor B1.

The switching differential corresponds to the neutral zone (±1 °C).

•

Plant types 2 and 5: Important is the temperature measured with sensor B1. The switching differential corresponds to the set switching differential of the boiler

(±0.5 × SD; operating line 94)

With plant types using a boiler, the switching differential corresponds to the set switching differential (± 0.5 × SD), and with plant types using a mixing valve, to the neutral zone (±1 °C).

The display shows the fault status message as . More detailed information is given on operating line 50 under error code 120.

The flow alarm can be deactivated by entering --:--.

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T

V

y w x t

A t

A t

A t

1 t

2

t

t Time t

1

Start of error display t

2

End of error display t

A

Waiting time (set on operating line 171)

T

V

Flow temperature w Setpoint x Actual value y Setpoint band

•

At t

1

, a fault status message is triggered; during the period of time t

A

(set on operating line 171), the actual value stayed below the setpoint band y

•

At t

2

, the fault status message is reset; the actual value x has reached the setpoint band y

13.4.3 Manual overriding of operating mode (contact H1)

Using a simple remote operation facility, the controller's operating mode can be overridden. This is accomplished by bridging terminals H1–M.

It is possible to select the operating mode that shall apply when H1–M are bridged:

Setting Operating mode heating circuit

0 Protection

1

AUTO

2 REDUCED

3 NORMAL

As long as this function is activated, the LED of the respective operating mode button flashes at low frequency (approx. 0.5 Hz). The buttons themselves are however inoperable.

Once this function is deactivated, the RVL480 will resume the operating mode previously selected.

Contact H1 has priority over contact H2 (refer to the section below). If both contacts are activated (closed), contact H2 is inactive. With plant types 4, 5 and 6, contact H1 is inactive.

13.4.4 Pump overrun

To prevent heat from building up, a common pump overrun time can be set for all pumps associated with the controller (with the exception of the circulating pump) on operating line 174. In that case, the pump overrun maintains the charging position for the set period of time.

In interconnected plants, the time set also affects the forced signals that a boiler can deliver to ensure overtemperature protection.

For detailed information, refer to section "10.4.5 Protection against boiler overtemperatures".

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Example:

Fundamentals

Uncritical locking si gnals

Critical locking signals

13.4.5 Pump kick

To prevent pump seizure during longer off periods (e.g. in the summer), it is possible to activate periodic pump runs:

0 = no periodic pump run

1 = periodic pump run activated

Periodic pump run lasts 30 seconds and takes place once a week, every Friday morning at 10:00.

13.4.6 Winter- / summertime changeover

The change from wintertime to summertime, and vice versa, takes place automatically.

If international regulations change, the dates need to be reentered.

The entry then to be made is the earliest possible changeover date. The weekday on which changeover occurs is always a Sunday.

If the start of summertime is given as "the last Sunday in March", the earliest possible changeover date is March 25. The date to be entered then is 25.03.

If no summer- / wintertime changeover is required, the two dates are to be set such that they coincide.

13.4.7 Gain of locking signal

The functions "Maintained boiler return temperature", "Protective boiler startup" and

"D.h.w. priority" use locking signals that are sent to the heat exchangers and loads.

With the heat exchanger and load controllers, it is possible to set on operating line 173

(Amplification of locking signal) to what degree they shall respond to a locking signal.

This gain of the locking signal is adjustable from 0 % to 200 %.

Setting

0 %

100 %

200 %

Response

Locking signal will be ignored

Locking signal will be adopted 1:1

Locking signal will be doubled

There are two types of locking signals:

•

Uncritical locking signals

•

Critical locking signals

The response of the loads depends on the kind 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:

In the heating circuit, the flow temperature setpoint will be reduced in function of the set locking signal gain. The mixing valves close.

•

Heating circuit with pump:

In case of a defined value of the uncritical locking signal, the heating circuit pump will be deactivated, independent of the set locking signal gain. In plants with changeover valve, the valve assumes the “Heating circuit” position.

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 will be sent to all loads and heat exchangers in the bus network and – if present – to its own heating circuit. If the boiler temperature controller is in segment 1…14, it will deliver the critical locking signal only to all loads in the same segment and – if present – to its own heating circuit.

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Minimum limitation of the return temperature can also be provided locally by a controller with plant type no. 1. In that case, the critical locking signal only acts inside the controller and is only delivered to the own heating circuit.

With regard to the response of the loads and heat exchangers, there are two choices:

•

Heat exchangers and loads with mixing valve:

The flow temperature setpoint will be reduced in function of the set locking signal gain. Heat exchangers and loads close their mixing valves

•

Loads with pump circuit:

When a defined value of the critical locking signal is reached, the pump will be deactivated, independent of the set locking signal gain.

13.5 Entries for LPB

13.5.1 Source of time of day

Depending on the master clock, different sources can be used for the time of day. It must be entered on the RVL480 (0…3 on operating line 178):

0 = autonomous clock in the RVL480

1 = time of day from the bus; clock (slave) with no remote readjustment

2 = time of day from the bus; clock (slave) with remote readjustment

3 = time of day from the bus; central clock (master)

The effect of the individual entries is as follows:

Entry Effect

0

•

The time of day on the controller can be readjusted

•

The controller's time of day is not matched

1

2 to the system time

•

The time of day on the controller cannot be readjusted

•

The controller's time of day is automatically and continually matched to the system time

•

The time of day on the controller can be readjusted and, at the same time, read-

Diagram

Adjustment

Controller time

Adjustment

Controller time

Adjustment

System time

System time

3 justs the system time since the change is adopted by the master

•

The controller's time of day is nevertheless automatically and continually matched to the system time

•

The time of day on the controller can be readjusted and, at the same time, readjusts the system time

•

The controller time is used as a presetting for the system

Controller time

Adjustment

Controller time

System time

System time

In each system, only one controller may be used as a master. If several controllers are set as masters, a fault status signal will be delivered (error code 100).



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13.5.2 Source of outside temperature

If, in interconnected plants, the outside temperature is delivered by the bus, the temperature source can be addressed either aut omatically or directly (operating line 180).

•

Automatic addressing:

Display, entry Explanation

SET A

ACTUAL xx.yy

(For automatic addressing)

Display of source address selected by automatic addressing: xx = segment number yy = device number

•

Direct addressing:

To be entered is the source address: xx.yy xx = segment number yy = device number

If the controller is operated autonomously (with no bus), there will be no display and an entry is not possible.

If the controller is used in an interconnected plant and if 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 uses the outside temperature signal delivered by its own sensor. The address displayed is its own.

For detailed information about addressing of the outside temperature source, refer to data sheet N2030.

13.5.3 Addressing of devices

Each device connected to the LPB requires an address. This address is comprised of a device number (a digit between 1 and 16) and a segment number (a digit between 1 and 14).

In an interconnected plant, each address may be assigned only once. If this is not observed, proper functioning of the entire plant cannot be ensured. In that case, a fault status signal will be generated (error code 82). If the controller is operated autonomously (with no bus), device number and segment 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

Permitted

G = 1

S = 0

G >1

S = 0

Permitted Permitted

G = 1

S >0

G >1

S >0

Permitted Permitted

2

Permitted Permitted Not permitted Permitted Not permitted

3

Permitted Permitted Permitted Permitted Permitted

4

Not permitted Permitted Not permitted Permitted Not permitted

5

Not permitted Permitted Not permitted Permitted Not permitted

6

Not permitted

D = device number

S = segment number

Permitted Not permitted Permitted Not permitted

If an inadmissible address has been entered, a fault status signal will appear (error code 140).

For detailed information about the addressing of devices, refer to data sheet N2030.


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13.5.4 Bus power supply

In interconnected plants comprising a maximum of 16 controllers, the bus power supply may be decentralized, that is, power may be supplied via each connected device.

On each connected device it is necessary to set whether the data bus is powered centrally or decentrally by the various controllers.

With the RVL480, this setting is made on operating line 179. The display shows the current setting as SET and the current bus power supply status as ACTUAL.

Display

SET

Bus power supply

0

Bus power supply is central (no power supply via controller)

SET

A

Bus power supply is decentral via the controller

ACTUAL 0 Presently no bus power supply available

ACTUAL 1 Bus power supply presently available

The word BUS appears on the display only when a bus address is valid and bus power supply is available. This means the display indicates whether or not data traffic via the data bus is possible.

13.5.5 Bus loading characteristic

The bus loading characteristic E for the LPB of the RVL480 is 6. The total of all E figures of the devices connected to the same bus may not exceed 300.

13.6 Heat demand output DC 0...10 V

Using the DC 0...10 V heat demand signal (terminals Ux–M), the RVL480 can transmit the heat demand to other devices.

The heat demand corresponds to the heat requisition in °C and – in terms of value – is identical with the heat requisition that reaches the precontroller via the data bus (LPB).

The temperature value of the heat demand corresponding to DC 10 V can be set via operating line 181.

Voltage signals:

Voltage Temperature when operating line 181 = 80 °C

DC 0 V 0 °C

DC 5 V 40 °C

DC 10 V 80 °C

Temperature when operating line 181 = 130 °C

0 °C

65 °C

130 °C

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14 Function block "Contact H2"

On this function block, it is entered on which plant section the heat demand of contact

H2 acts.



184 Function when terminals H2 –M are linked


0 (0 / 1)

Unit

14.2 Description

Flow / boiler temperature control can be overridden by using remote operation. This is accomplished by bridging terminals H2–M.

On operating line 184 – with plant types 1, 2 and 3 – it is possible to select to whom the heat demand signal shall be passed:

Setting 0 = heat demand signal to the heat source

Setting 1 = heat demand signal to the heating circuit

With plant types 4 and 5, the heat demand signal is always passed to the heat source.

On operating line 185, it is possible to select the setpoint to be used when H2–M is connected:

0 = constant flow / boiler temperature setpoint, the RVL480 maintains that fixed value

1 = minimum flow / boiler temperature setpoint; the minimum temperature maintained by the RVL480 is this setpoint, even if other demands call for a lower setpoint.

The setpoint can be adjusted on operating line 186.

As long as this function is active, the LED of the respective operating mode button flashes at a high frequency (approx. 2 Hz).

When contact H1 is closed, contact H2 is inactive, which means that contact H1 has priority over contact H2.

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15 Function block " Contact H2 and general displays"

This function block handles the external inputs and several display functions.



185 Effect when connection terminals H2 –M are linked

186 Demand for heat when connection terminals H2 –M are linked

194 Hours run counter

195 Controller's software version

196 Identification code of room unit


0 (0 / 1)

70 (0…140)

Display function

Display function

Display function

Unit

°C

15.2 Contact H2

For details, refer to chapter 14 Function block "Contact H2".

15.3 Hours run counter

The number of controller operating hours is displayed. Whenever operating voltage is present, the RVL480 counts the number of hours.

The maximum reading is limited to 500,000 hours (57 years).

15.4 Software version

The controller displays the software version in use.

15.5 Identification number of room unit

Based on the number shown in the display, the type of room unit used can be identified.

The types of room units that can currently be used with the RVL480 carry the following numbers:

82 = QAW50

83 = QAW70

The RVL480 ignores room units that cannot be used (e.g. the QAW20) and generates a fault status signal (error code 62).

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16 Function block "Locking functions"

On the software side, all settings can be locked to prevent tampering.

Also, the settings required for district heat applications can be locked on the hardware side.



248 Locking of settings


0 (0…2)

Unit

16.2 Locking the settings on the software side

On operating line 248, the settings made on the controller can be locked on the software side. This means that the settings made can still be called up on the controller, but cannot be changed.

Locking may comprise:

•

All settings

•

Only the settings required for the district heat parameters

The settings can be changed via the bus.

The procedure is the following:

1. Press buttons and together until appears in the display.

2. Press buttons, , , and , one after the other.

3. Now, operating line 248 appears in the display. The following locking choices are available:

0 = no locking

1 = all settings are locked

2 = only the settings required for the district heat parameters are locked (operating lines 101 to 117)

After locking all settings, the following setting elements remain operative:

•

The buttons for selecting the operating lines

•

The Info button

No longer operative will be:

•

The buttons for the readjustment of values

•

The bar for changing the basic setting of the heating curve

•

The setting knob for readjustment of the room temperature

•

The operating mode buttons

•

The manual mode button

16.3 Locking the settings for district heat on the hardware side

The settings required for district heat applications (operating lines 101 to 117) can be locked by bridging terminals H3–M. This kind of locking has priority over locking on the software side. If locking is made on the hardware side, settings via the bus can no longer be changed either.

To make the link across terminals H3–M inaccessible, the controller can be sealed to prevent its removal.

Also refer to chapter “19. Handling”.

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17 Communication

17.1 Combination with room units

17.1.1 General

•

Room units can be used with the RVL480 only if one of the plant types 1, 2 or 3 has been selected on the controller

•

The room temperature acquired by a room unit is adopted by the RVL480 at terminal

A6. If the room temperature signal delivered by the room unit shall not be considered by the control functions, the respective source needs to be selected (operating line

65). The other room unit functions will then be maintained

•

The connection of an unsuitable room unit is detected by the RVL480 as a fault and displayed as such on operating line 50 (error code 62)

•

Faults that the room unit detects in itself are displayed by the RVL480 on operating line 50 (error code 61)

•

The identification number of the room unit can be called up on operating line 196

17.1.2 Combination with room unit QAW50

Overriding the operating mode

Room unit QAW50 with room temperature sensor and room temperature readjustment

(setting knob)

The QAW50 can act on the RVL480 as follows:

•

Overriding the operating mode

•

Readjustment of room temperature

For this purpose, the QAW50 has three operating elements:

•

Operating mode slider

•

Economy button (also called presence button)

•

Setting knob for room temperature readjustments

From the QAW50, the operating mode of the RVL480 can be overridden. This is made with the operating mode slider and the economy button.

To enable the room unit to act on the RVL480, the following operational conditions must be satisfied on the controller:

•

AUTO mode

•

No holiday period active, no manual operation

The effect of the QAW50's operating mode slider on the RVL480 is as follows:

Operating mode QAW50 Operating mode RVL480

, temporary overriding with QAW50 economy button possible

Continuously NORMAL heating or continuously

REDUCED heating , depending on the economy button

Protection

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Setting knob

Using the setting knob of the QAW50, the room temperature setpoint of NORMAL heating can be readjusted by ±3 °C.

The setting of the room temperature setpoint on the controller's operating line 1 will not be affected by the QAW50.

17.1.3 Combination with room unit QAW70

Note on day of the week

Overriding the operating mode

Setting knob

Room unit QAW70 with room temperature sensor, time switch, setpoint adjustment and room temperature readjustment (setting knob)

Using the QAW70, the following functions can be performed or the room unit can act on the RVL480 as follows:

•

Overriding the operating mode

•

Overriding the room temperature setpoints

•

Readjustment of room temperature

•

Entry of time of day

•

Overriding the heating program

•

Display of actual values acquired by the RVL480

For this purpose, the QAW70 has the following operating elements:

•

Operating mode buttons

•

Economy button (also called presence button)

•

Setting knob for room temperature readjustments

•

Buttons for selecting the operating lines

•

Buttons for changing the values

The day of the week is calculated automatically by the controller; an adjustment from the room unit QAW70 is not possible.

From the QAW70, the operating mode of the RVL480 can be overridden. This is accomplished with the operating mode button and the economy button.

To enable the room unit to act on the RVL480, the following operational conditions must be satisfied on the controller:

•

AUTO mode

•

No holiday period active, no manual operation

The effect of the QAW70's operating mode buttons on the RVL480 is as follows:

Operating mode QAW70 Operating mode RVL480

; Temporary overriding with QAW70 economy button possible

Continuously NORMAL heating

or continuously

REDUCED heating , depending on the economy button

Protection

With the setting knob of the QAW70, the room temperature setpoint of NORMAL heating can be readjusted by ±3 °C.

The setting of the room temperature setpoint on the controller's operating line 1 will not be affected by the QAW70.

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Effect of the individual

QAW70 operating lines on the RVL480

Note

Overriding the QAW70 entries from the RVL480

If 1 (slave with no remote adjustment) is entered on operating line 178 (clock mode) of the RVL480, the time of day on the QAW70 cannot be changed.

2

3

4

Line on

QAW70

1

Function, parameter Effect on RVL480, notes

Setpoint of NORMAL heating Changes operating line 1 on the RVL480

Setpoint of REDUCED heating Changes operating line 2 on the RVL480

5

6

7

8

9

10

11

12

13

14

Setpoint of d.h.w. temperature Not available on the RVL480

Weekday (entry of heating program)

Changes operating line 4 on the RVL480

First heating period, start of

NORMAL heating


First heating period, start of

REDUCED heating


Second heating period, start of


NORMAL heating

Second heating period, start of


RECUCED heating

Third heating period, start of

NORMAL heating


Third heating period, start of

REDUCED heating

Display of weekday 1…7


Cannot be adjusted (refer to subsection “6.2

Time of day and date”)

Entry time of day Changes operating line 38 on the RVL480

Display of d.h.w. temperature Not available on the RVL480

Display of boiler temperature Only with plant types 2 and 5

15

16

17

51

Display of flow temperature

Holidays

Only with plant types 1, 3, 4 and 6

RVL480 changes to protection mode

52

53

Reset to default values

Bus address

Identification room unit

QAW70 default values are used

Bus address to be entered on the room unit 1

Display on operating line 196 of the RVL480

Operating lock on QAW70 No effect on RVL480

58 Type of setpoint display No effect on RVL480

For detailed information about the QAW70 room unit, refer to Installation Instructions

1637 (74 319 0173 0).

If the RVL480 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 RVL480:

•

Time of day and weekday

•

Complete heating program

•

Room temperature setpoint of NORMAL heating

•

Room temperature setpoint of REDUCED heating

This means that the RVL480 is always the data master.

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17.2 Combination with SYNERGYR central unit

OZW30

Based on the room temperatures of the individual apartments, the central unit OZW30

(software version 3.0 or higher) generates a load signal. This signal is passed on via

LPB to the RVL480 where it produces an appropriate change of the flow temperature setpoint.

17.3 Communication with other devices

The RVL480 offers the following communication choices:

•

Signaling the heat demand of several RVL480 to the heat generating equipment

•

Exchange of locking and forced signals

•

Exchange of measured values such as outside temperature, return temperature and flow temperature as well as clock signals

•

Controller RVL481 is not compatible with the RVL469; RVL479 is downward compatible

•

Exchange of fault status signals

For detailed information about the communication via LPB, refer to the following documents:

•

Data sheet N2030, "Basic System Data"

•

Data sheet N2032, "Basic Engineering Data"

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18 Heating controller RVL479

18.1 Features and function

The RVL479 has been designed as a favorably-priced controller for the control of a second heating circuit. It must always be used in connection with a partner unit.

The basic design of the RVL479 is very similar to that of the RVL480. The relevant functions have been adopted.

18.2 Technical design

18.2.1 Type of plant

The RVL479 only offers plant type 1 of the RVL480, namely “Heating circuit control with mixing group”.

BUS (LPB)

N1

B9

Y1

M1

A6/B5

B1

Suitable partners

Addressing the partner

B7

A6 Room unit

B1 Flow temperature sensor


B7 Return temperature sensor

B9 Outside sensor

E2

E2 Load (room)

LPB Data bus

M1 Heating circuit pump


Y1 Heating circuit mixing valve

18.2.2 Operation with a partner

Operation of the RVL479 with a partner unit is mandatory. The two partners are connected via bus (LPB). The RVL479 cannot operate without partner, i.e. it is in the passive mode (refer to section “18.2.4 Passive mode”).

The following controllers can be used as partners:

•

RVL480

•

RVL481

•

RVL482

•

RVL470

•

RVL471

•

RVL472

Each RVL479 requires one such partner. The plant type selected on the partner is of no importance to the RVL479.

On the bus (LBP), the RVL479 must be located in the same segment as its partner. Its device number must be one digit lower than that of the partner. If the addressing is not correct, the RVL479 will not operate, or it will change to the passive mode.

Addressing example with two RVL480 and two RVL479:

Bus

Segment 1

RVL480

Adr. = 1

RVL479

Adr. = 2

RVL480

Adr. = 3

RVL479

Adr. = 4

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Wrong addressing

Missing or wrong partner

18.2.3 Handling errors

If two RVL479 have the same bus address, a fault message will be generated in both controllers and operating line 50 will display error code 82 (same bus address assigned several times). In that case, both RVL479 will change to the passive mode until the addresses have been correctly entered.

If the partner is not correctly addressed, the RVL479 will not be able to establish a connection. The response is the same as if the partner was faulty.

The RVL479 periodically prompts its partner on the bus. Depending on the reply given, the RVL479 will respond as follows:

Reply Response

The partner is correctly identified (e.g. RVL480)

The identified partner is inadmissible (e.g. RVP3…)

The RVL479 gets no reply from the partner (e.g. bus interrupted)

The RVL479 is switched to the active mode; it operates normally.

A new prompt is made after 10 minutes

The RVL479 changes to the passive mode.

A new prompt is made after 1 minute

The RVL479 maintains its current operational status and makes a new prompt after 1 minute.

After the third successive prompt with no reply, the

RVL479 changes to the passive mode

After switching on power, the RVL479 will always be in the passive mode.

18.2.4 Passive mode

The passive mode of the RVL479 is defined as follows:

•

The outputs are switched as follows:

– Pump M1 = OFF

– Mixing valve Y1 = CLOSED

•

A fault message with error code 142 (missing partner) will be generated

•

Manual operation works normally

•

Operation and display work normally

•

Operation with the room unit works normally

•

On the bus (LPB), process signals and temperatures are exchanged the normal way

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Operating elements

19 Handling

19.1 Operation

19.1.1 General

1

Display

Siemens


8

9

2

3

10

11

4

5

6

12

3

4

9

13

7

1 Operating mode buttons (selected button is lit)

2 Display (LCD)

3 Buttons for operating the display:

Prog = selection of operating line

– + = adjustment of displayed value

4 Button for “Close heating circuit mixing valve” or burner stage 2 ON/OFF in manual operation

5 Button for “Open heating circuit mixing valve” in manual o peration

6 Button for manual operation

7 LEDs for:

Manual operation

/ Heating circuit mixing valve opens / burner stage 1 ON

/ Heating circuit mixing valve closes / burner stage 2 ON

Pump runs

8 Sealing facility in the cover

9 Info button for the display of actual values

10 Setting slider for flow temperature setpoint at an outside temperature of –5 °C

11 Setting slider for flow temperature setpoint at an outside temperature of 15 °C

12 Setting knob for readjustment of room temperature

13 Fixing screw with sealing facility

1 8 2 5

6

7

1 Display of fault status messages

2 Display of "Holiday program active"

3 Display of "ECO function active"

4 Display of "Bus power supply available"

5 Cursor for Info button (display of temperatures)

6 Display of temperatures, times, etc.

7 Display of current heating program

8 Display of operational level

9 Display of current operating line number


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Operating instructions

The operating instructions are inserted in a holder at the rear of the cover. When in their proper place, the list of operating lines that can be selected by the end-user is visible.

The operating instructions are designed for use by janitors and end-users. They also contain tips on heat energy savings and plant fault tracing.

Buttons and displays for selecting the operating mode

Heating curve

Setting knob for room temperature readjustments

Buttons and displays for manual operation

Display of positioning commands

Display "Heating operates"

19.1.2 Analog operating elements

For the selection of the operating mode there are four buttons available. The required operating mode is activated by pressing the respective button. Eac h button has an integrated LED. The currently active operating mode is indicated by the respective

LED.

For the direct setting of the heating curve, the little bar is used, which has proved its worth over many years. The slider on the left is used to set the required flow temperature at an outside temperature of 15 °C, the slider on the right to set it at –5 °C.

The link between the two sliders represents the heating curve.

The heating curve can also be set via the operating lines. In that case, the bar is inactive.

A setting knob is used for manual room temperature readjustments. Its scale gives the room temperature change in °C.

By turning the setting knob, the heating curve is displaced parallel (functionally), but the bar maintains its position.

Three buttons are available for manual operation:

•

One button for the activation of manual operation. An LED indicates manual operation. Manual operation is quit by pressing the same button again or by pressing any of the operating mode buttons

•

Two buttons for manual positioning commands. In plants using slipper or seat valves, the regulating unit can be driven to any position by pressing the respective button.

In plants with direct burner control, burner stage 2 can be switched on and off by pressing button / .

When pressing a button, the associated LED is lit

The LEDs next to the symbols for the heating circuit's mixing valve indicate the positioning commands:

/ = mixing valve in heating circuit fully OPEN or first burner stage ON

/ = mixing valve in heating circuit fully CLOSED or second burner stage ON

The LED beside the pump symbol is lit whenever the heating circuit pump/circulating pump M1 runs, that is, whenever the heating operates.

Operating line principle

19.1.3 Digital operating elements

The entry and readjustment of all setting parameters, the activation of optional functions and the reading of actual values and statuses are based on the operating line principle. An operating line with an associated number is assigned to each parameter, each actual value and each optional function. The selection of an operating line and readjustment of the display are always made with a pair of buttons.

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Buttons

Block skip function

Info button

Setting levels

Access rights

To select and readjust setting values, the procedure is the following:

Buttons Procedure Effect

Line selection buttons Press button Selection of the next lower operating line

Press button Selection of the next higher operating line

Setting buttons Press button Decrease of displayed value

Press button Increase of displayed value

The value set will be adopted

•

when selecting the next operating line, that is, by pressing button or

•

by pressing the Info button

•

by pressing any of the operating mode buttons

If the entry of --.- or --:-- is required, button or must be pressed until the required display appears. Then, the display maintains --.-.

The operating lines are grouped as blocks. To reach a specific operating line of a block quickly, the other blocks can be skipped, so it is not necessary to select all the other lines one by one. This is accomplished by using two combinations of buttons:

Procedure Effect

Keep button depressed and push Selection of the next higher function block

Keep button depressed and push Selection of the next lower function block

The Info button is used to obtain basic information about the plant. Pressing this button, the cursor in the display is placed below the required symbol.

The symbols have the following meaning:

Symbol Display of

Flow or boiler temperature

Room temperature

Outside temperature

Time of day

It is always the information selected last that is permanently shown in the display.

19.1.4 Setting levels and access rights

The operating lines are assigned to three different levels. Assignment and access are as follows:

Level

End-user

Operating lines Access

1 to 50

Press or

Heating engineer 51 to 197

Press and for three seconds

Locking level 248

Press and together until appears; then, press, , and one by one

•

The end-user can access all analog operating elements.

This means that he can select the operating mode, set the heating curve, readjust the room temperature with the setting knob, and activate manual operation.

Also, he can access the setting level "End-user" on operating lines 1 to 50.

•

The heating engineer can access all operating elements and operating lines

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Setting the operating line "Plant type"

Setting the other opera ting lines

Operating lines for functional checks

19.2 Commissioning

19.2.1 Installation instructions

The RVL480 is supplied with installation instructions which give a detailed description of installation, wiring and commissioning with functional checks and settings. They are written for trained specialists. Each operating line has an empty field in which the selected value can be entered..

The installation instructions should not be thrown away after use but kept together with the plant documentation.

19.2.2 Operating lines

The most important work to be performed when commissioning the plant is entry of the required type of plant. This entry activates all functions and settings required for the relevant plant type.

All operating lines contain field-proven and practice-oriented values. Codings, guide values, explanations, etc., are given in the installation instructions where required.

Function block "Service functions and general settings" contains three operating lines that are especially suited for making functional checks:

•

Operating line 161 permits the simulation of an outside temperature

•

On operating line 162, each of the three output relays can be energized

•

On operating line 163, all actual sensor values can be called up

•

On operating line 164, the states of the H–x contacts can be called up

If the display shows , the fault can be pinpointed via the error code on operating line 50.

19.3 Installation

19.3.1 Location

The ideal location for the controller is a dry room, such as the boiler room, but it can also be installed in a location which, from a climatic point of view, is unfavorable. Its degree of protection is IP42 to EN 60529 and is therefore protected against dripping water.

The permissible ambient temperature is 0…50 °C.

The RVL480 can be fitted as follows:

•

In a control panel (on the inner wall or on a top hat rail)

•

On a panel

•

In the control panel front

•

In the sloping front of a control desk

19.3.2 Mounting choices

The RVL480 can be mounted in three different ways:

•

Wall mounting: the base is secured to a flat wall with three 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 × 138 mm (+1 mm / –0 mm)

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19.3.3 Wiring

•

Local regulations for electrical installations must be complied with

•

Only qualified staff may carry out electrical installations

•

The cable lengths should be chosen such that there is sufficient space to open the control panel door

•

Cable tension relief must be provided

•

The cables of the measuring circuits carry extra-low voltage

•

The cables from the controller to the regulating unit and the pump carry mains voltage

•

Sensor cables must not be run parallel to mains carrying cables for loads such as actuator, pump, burner, etc. (insulation class II EN 60730)

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20 Engineering

20.1 Connection terminals

DB MB A6 MD B9 B1 M Ux

B7

M H1 H2 B5 M B71 H4 H3 M

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

M

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Siemens


N

N L

F1

/F4

Y1

/K4

F2

/F5

Y2

/K5

F3 Q1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Base with terminals

20.1.1 Low voltage side

DB Data LPB

MB Ground for LPB

A6 PPS (point-to-point interface), connection of room unit

MD Ground for PPS

B9 Outside sensor

B1 Flow or boiler temperature sensor

M Ground for sensors, changeover contacts and signal outputs (4 times)

Ux Heat demand output

B7 Return temperature sensor

H1 Changeover contact "Operating mode"

H2 Changeover contact for flow temperature setpoint



H4 Minimum stroke limitation (Y min

contact)

H3 Contact for locking the district heat parameters

The low voltage side carries one auxiliary terminal (M).

20.1.2 Mains voltage side

N

L

Neutral AC 230 V

Live AC 230 V

F1/F4 Input for Y1/K4

Y1/K4 Heating circuit mixing valve OPEN / first burner stage ON

F2/F5 Input for Y2/K5

Y2/K5 Heating circuit mixing valve CLOSE / second burner stage ON

F3

Q1

Input for Q1

Heating circuit pump / circulating pump

The mains voltage side carries two auxiliary terminals (N and ).


20 Engineering

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20.05.2008

Low -voltage side

Mains voltage side

L

20.2 Connection diagrams

LPB

A6

D1 D2

B9

B M

B1

B M

+

B7

B

M

S 1 S2 B5

B M

B71

B M

Y1

L DB MB A6 MD B9 B1 M

Ux

B7 M H1 H2 B5 M B71 H4 H3 M

N

N1

N

Diagram on the left:

Connections for plant types 1, 3, 4 and 6 (mixing valve or district heat)

Diagram on the right:

Connections for plant types 2 and 5 (boiler with a 2-stage burner)

L

L

L

F1/F4

F2/F5 F3

L F1/F4

N Y1/K4 Y2/K5 Q1

Y1

N

Y2

Y1 M1

N1

N N

A6 Room unit

B1 Flow or boiler temperature sensor



B71 Return temperature sensor (secondary circuit)

B9 Outside sensor

E1 2-stage burner

F1 Thermal reset limit thermostat

F2 Manual reset safety limit thermostat

LPB Data bus

M1 Heating circuit pump/circulating pump


S1 Remote operation "Operating mode"

S2 Remote operation “Flow temperature setpoint”

Ux Heat demand output

Y1 Actuator for 3-position control

* Wire link for locking the district heat parameters

N F2/F5 Y2/K5 Y1/K4

F 1 F2

1.

2.

E1

F3

Q1

M 1

N 1

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21 Mechanical design

21.1 Basic design

The RVL480 is comprised of controller insert, which accommodates the electronics, the power section, the output relays and – on the front – all operating elements, and the base, which carries the connection terminals. The operating elements are located behind a lockable transparent cover. On the inner side of the cover, there is a holder in which the operating instructions can be inserted.

All values are read in the display (LCD) featuring background lighting.

The cover can be sealed.

The RVL480 has standard overall dimensions (144 ×144 mm).

It can be fitted in three different ways:

•

Wall mounting

•

Rail mounting

•

Flush panel mounting

Whichever mounting method is chosen, the base must always be mounted and wired first. To ensure the orientation will be correct, the upper side of both the base and the controller housing carry the marking TOP. Both the top and the bottom side of the base have 5 knockout holes for cable entries, and there are ten knockout holes in the floor.

The controller insert is placed in the base. The controller insert has two fixing screws with rotating levels. 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.

The fixing screw at the bottom can be sealed. The grommet (attached to the key ring) must be inserted in the screw hole, a safety wire introduced through the two lugs, and then sealed.

21.2 Dimensions

EN 60715

1.5

95

139

(42.5)

144

16.4

max. 8 max. 5

EN 50262

Dimensions in mm

26 26 26 26

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21 Mechanical design

144

4.5

1 4 max. 3

18

36

72

106

108

IEC 61554 - 144 × 144

138

+1

0

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20.05.2008

Power supply

Output relays

Permissible cable lengths to sensors and room unit

Connection terminals

Communication by wire

Backup

Standards

Protective data

Dimensions

Weight

Colors

Environmental conditions

22 Technical data

Rated operating voltage

Frequency

Power consumption (no external load)

Supply line fusing

Switching capacity

Switching current Y1/K4, Y2/K5, Q1

Rated current of ignition transformer

Switch-on current of ignition transformer max.10 A (max. 10 ms)

Copper cable 0.6 mm

∅

Copper cable 0.5 mm

2

Copper cable 1.0 mm

2

Copper cable 1.5 mm

2

20 m

50 m

80 m

120 m

Screw terminals for wire sec tion up to 2.5 mm

2

Bus protocol / type

Bus loading characteristic E

Backup of controller clock

-conformance to

EMC directive

– Immunity

– Emissions

Low voltage directive

– Safety

Safety class

Degree of protection (cover closed)

AC 230 V (

50 Hz max. 7 VA

10 A

AC 24…230 V

AC 0.02…2 (2) A max.1 A (max. 30 s)

LPB

6

12 h

±

2006/95/EC

10 %)

2004/108/EC

– EN 61000-6-1 / -2

– EN 61000-6-3 / -4

– EN 60730-1 / EN 60730-2-9

II to EN 60730

IP42 to EN 60529

2 to EN 60730 Degree of contamination

Unit (net) refer to ”Dimensions“

1.1 kg

Controller insert

Terminal base

Light grey RAL 7035

Pigeon blue RAL 5014

Operation Transport

EN 60721-3-3 EN 60721-3-2

Storage

EN 60721-3-1

Climatic conditions

Temperature class 3K5 class 2K3 class 1K3

0…+50 °C –25…+70 °C –20…+65 °C

Humidity

<95 % r.h.

(non-condensing)

<95 % r.h. <95 % r.h.

(non-condensing)

Mechanical conditions class 3M2 class 2M2 class 1M2

Use above sea level max. 3000 m above sea level

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22 Technical data

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Index

2

2-position control ................................................ 38

2-position controller............................................. 37

3

3-position control .......................................... 35, 36

A access rights...................................................... 69 acquisition of measured values ............................. 18 address............................................................. 56 addressing of devices.......................................... 56 analog operating elements ................................... 68 attenuated outside temperature ............................ 25 automatic mode.................................................. 16 auxiliary terminals ............................................... 72 averaging .......................................................... 18

B bar.................................................................... 32 base.................................................................. 74 basic information ................................................ 69 basic setting heating curve ................................... 32 block skip function .............................................. 69 boiler operating mode.......................................... 17 boiler operating modes ........................................ 37 boiler overtemperatures ....................................... 41 boiler startup...................................................... 40 boost heating ..................................................... 30 bridging terminals H1–M...................................... 53 bridging terminals H2–M...................................... 58 bridging terminals H3–M...................................... 60 bridging terminals H4–M...................................... 47 brief description....................................................9 building time constant.......................................... 25 buildings............................................................ 11 burner cycling protection...................................... 38

Bus loading characteristic .................................... 57 bus power supply................................................ 57 buttons for manual operation................................ 68

C central unit OZW30............................................. 64 changeover winter- / summertime ......................... 54 combination with room unit QAW50....................... 61 combination with room unit QAW70....................... 62 combination with SYNERGYR central unit

OZW30 ............................................................. 64 commissioning ................................................... 70 communication................................................... 64

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Building Technologies Heating Controllers RVL480 and RVL479

Index composite outside temperature ............................ 25 connection diagrams........................................... 73 connection terminals........................................... 72 contact H1......................................................... 53 contact H2......................................................... 58

Contact H2........................................................ 59 continuous NORMAL heating............................... 16 continuous REDUCED heating............................. 16 control with a 2-stage burner................................ 39 control with a single-stage burner ......................... 38 controller insert .................................................. 74 critical locking signals ......................................... 54

D date.................................................................. 23 demand-compensated control.............................. 34 differential of return temperature........................... 46 digital operating elements.................................... 68 dimensions ........................................................ 74 display .............................................................. 67 display "Heating operates"................................... 68 display functions ................................................ 48 display of current setpoints.................................. 33 display of positioning commands .......................... 68 displays for manual operation .............................. 68 district heat connection ....................................... 45

DRT ................................................................. 46

E

ECO function..................................................... 25 electronics......................................................... 74 engineering ....................................................... 72 entries for LPB................................................... 55 entry of the type of plant...................................... 24 excess mixing valve temperature.......................... 36

F flow alarm ......................................................... 52 flow and boiler temperature ................................. 18 flue gas condensation......................................... 43 forced signal...................................................... 41 frost protection for the boiler ................................ 40 frost protection for the plant ................................. 52 function............................................................. 48 function block 3-position controller........................ 35 function block Boiler............................................ 37 function block Contact H2.................................... 58 function block District heat................................... 45 function block End-user 1.................................... 21 function block End-user 2.................................... 23 function block External inputs............................... 59

CE1P2540en

20.05.2008

function block Locking functions ............................60 function block Minimum limitation of return temperature........................................................43 function block Plant type ......................................24 function block Setpoint of return temperature limitation............................................................43 function block Space heating................................25 function blocks....................................................13

G gain factor for the room temperature influence........31 gain of locking signal...........................................54 generation of setpoint ..........................................34 manual overriding of operating mode..................... 53 master clock ...................................................... 55 maximum limitation of boiler temperature............... 37 maximum limitation of flow temperature................. 35 maximum limitation of primary return temperature....................................................... 45 maximum limitation of return temperature differential.......................................................... 46 maximum limitation of room temperature ............... 31 mechanical design.............................................. 74 minimum burner running time............................... 38 minimum limitation of boiler temperature................ 38 minimum limitation of flow temperature.................. 35 minimum limitation of stroke................................. 47 mounting choices ............................................... 70

H handling.............................................................67 handling of faults.................................................18

H-contacts .........................................................51 heat demand out put ............................................57 heat storage capacity...........................................25 heating curve ........................................... 32, 49, 68 heating curve's deflection.....................................32 heating limits ......................................................26 heating program..................................................21 heating systems..................................................11 holiday program..................................................22 hours run counter................................................59

N

NORMAL heating ............................................... 16

O operating element s ............................................. 67 operating instructions .......................................... 68 operating line principle ........................................ 68 operating modes................................................. 16 operation........................................................... 67 operational level ................................................. 17 operational status ............................................... 17 optimization....................................................... 27 optimum start control........................................... 29 optimum stop control........................................... 29 outside temperature............................................ 19

I identification number of room unit..........................59 indication of faults ...............................................23 info button..........................................................69 installation instructions .........................................70 integral action time..............................................47 interconnected plants...........................................36

K key features ........................................................ 9

L limitation of return temperature differential..............46 limitations of the flow temperature .........................45 little bar..............................................................32 location..............................................................70 locked on the software side ..................................60 locking...............................................................60 locking functions .................................................60 locking of pulses .................................................36 locking the settings for district heat ........................60 locking the settings on the hardware side...............60 locking the settings on the software side ................60

LPB...................................................................55

P parallel displacement of heating curve ................... 33 partner .............................................................. 65 periodic pump run............................................... 54

Plant type and operating mode............................. 17 plant types ......................................................... 13 plant types ......................................................... 14 primary return temperature .................................. 19 product documentation........................................ 10

Protection.......................................................... 17 protection against boiler overtemperatures............. 41 protective boiler startup....................................... 40 pump kick.......................................................... 54 pump overrun..................................................... 53 pump overrun time.............................................. 41

Q quick setback..................................................... 29

M manual operation................................................17 manual overriding of flow temperature ...................58

Siemens



Index

R

REDUCED heating............................................. 16 relay test ........................................................... 50 release limit....................................................... 39 reset limit........................................................... 39

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room model........................................................ 18 room model temperature...................................... 28 room temperature ............................................... 18 room temperature deviations ................................ 31 room temperature influence.................................. 31 room temperature setpoint boost........................... 30 room unit QAW50............................................... 61 room unit QAW70............................................... 62 room units that cannot be used............................. 59

RVL479............................................................. 65

S safety functions .................................................. 37 sealed............................................................... 74 secondary return temperature............................... 20 selection of operating mode ................................. 68 setpoint increase................................................ 35 setpoint of return temperature limitation ................. 43 setpoints............................................................ 21 setpoints and measured values of sensors ............. 50 setting knob for room temperature readjustments .................................................... 68 setting levels...................................................... 69 shifting compensation.......................................... 46 simulation of outside temperature.......................... 50 software version ................................................. 59 source of outside temperature.............................. 56 source of time of day .......................................... 55 suitable actuators ............................................... 10 suitable room units ............................................. 10 suitable sensors................................................... 9 summertime ...................................................... 54 suppression of hydraulic creep............................. 47 switching times .................................................. 21

T terminate the relay test........................................ 50 terminate the simulation ...................................... 50 time of day ........................................................ 23

U uncritical locking signals...................................... 54

W weather-compensated control.............................. 34 winter- / summertime changeover ......................... 54 wintertime ......................................................... 54

Y yearly clock ....................................................... 23

Ymin function..................................................... 47

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Index

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Siemens



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19.12.2005

Siemens Switzerland Ltd

Building Technologies Group

International Headquarters

Gubelstrasse 22

CH – 6301 Zug

Tel. +41 41 724 24 24

Fax +41 41 724 35 22 www.sbt.siemens.com

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Heating Controllers RVL480 and RVL479 c

CE1P2540en

20.05.2008

Siemens RVL 480, RVL 479 Heating Controller Basic Documentation

Assistant Bot

Basic Documentation

Building Technologies

Contents

1 Summary

1.1 RVL480 and RVL479

1.2 Brief description and key features

1.3 Equipment combinations

1.3.1 Suitable sensors

1.3.2 Suitable room units

1.3.3 Suitable actuators

1.3.4 Communication

1.3.5 Passing on of heat demand signal

1.3.6 Product documentation

2 Use

2.1 Types of plant

2.2 Types of buildings

2.3 Types of heating systems

2.4 Functions

3 Fundamentals

3.1 Key technical features

3.1.1 Plant types with regard to the heating circuit

3.1.2 Function blocks

3.2 Plant types

3.3 Plant types and function blocks

3.4 Operating modes

3.4.1 Automatic mode

3.4.2 Continuous REDUCED heating

3.4.3 Continuous NORMAL heating

3.4.4 Protection

3.4.5 Manual operation

3.4.6 Plant type and operating mode

3.5 Operational status and operational level

Operating mode

Operating state

Operational level

4 Acquisition of measured values

4.1 Room temperature (A6, B5)

4.1.1 Measurement

4.1.2 Handling of faults

4.1.3 Room model

4.2 Flow and boiler temperature (B1)

4.2.1 Measurement

4.2.2 Handling of faults

4.3 Outside temperature (B9)

4.3.1 Measurement

4.3.2 Handling of faults

4.4 Primary return temperature (B7)

4.4.1 Measurement

4.4.2 Handling of faults

4.5 Secondary return temperature (B71)

4.5.1 Measurement

4.5.2 Handling of faults

5 Function block "End-user space heating"

5.1 Operating lines

5.2 Setpoints

5.2.1 General

5.2.2 Frost protection for the building

5.3 Heating program

5.4 Holiday program

6 Function block "End-user general"

6.1 Operating lines

6.2 Time of day and date

6.3 Indication of faults

7 Function block "Plant type"

7.1 Operating line

7.2 General

8 Function block "Space heating"

8.1 Operating lines

8.2 ECO function

8.2.1 Compensating variables and auxiliary variables

8.2.2 Heating limits

8.2.3 Mode of operation

8.2.4 Operating modes and operational statuses

8.3 Room temperature source

8.4 Optimization

8.4.1 Definition and purpose

8.4.2 Fundamentals

8.4.3 Process