Honeywell R0808, EN2H-0221GE51 R0808 User Manual

Smile SDC heating and

district heating controller

SERVICE MANUAL

EN2H-0221GE51 R0808

SDC / DHC Contents

Contents

1 Software version ..........................................................................................................11

2 Safety instructions.......................................................................................................11

2.1 Intended use .....................................................................................................11

2.2 Requirements for start-up..................................................................................11

2.2.1 Power supply ........................................................................................12

2.2.2 Connection conditions ..........................................................................12

2.2.3 Cable cross-sections ............................................................................12

2.2.4 Maximum cable lengths........................................................................12

2.2.5 Cable installation ..................................................................................12

2.2.6 Grounding and zeroing .........................................................................13

2.3 Hot-water temperature greater than 60 °C ........................................................13

2.4 Connection of accessory parts ..........................................................................14

2.5 Maintenance and cleaning ................................................................................14

2.6 Safety precautions for EMC-compliant installation ............................................15

3 Overview.......................................................................................................................20

4 Abbreviations ...............................................................................................................21

5 Operation......................................................................................................................22

5.1 Display and operating elements ........................................................................22

5.1.1 Display (basic display)..........................................................................23

5.1.2 Operating elements ..............................................................................24

5.1.2.1 Input button (press / turn)........................................................24

5.1.2.2 "Daytime room temperature" button ........................................24

5.1.2.3 "Night-time room temperature" button.....................................25

5.1.2.4 "Daytime hot-water temperature" button .................................25

5.1.2.5 "Operating mode" button (basic display) .................................26

5.1.2.6 "Switching time programs / Holiday programs" button ............33

5.1.2.7 "System information" button....................................................35

5.1.2.8 "Manual mode" / "Emission measurement" button ..................44

EN2H-0221GE51 R0808 3

Contents SDC / DHC

5.1.2.9 Access to the technician / OEM area ......................................46

5.1.2.10 Heating curve..........................................................................47

5.2 Menu-selection level..........................................................................................48

5.2.1 "Time - Date" menu ..............................................................................54

5.2.2 "Timeprograms" menu ..........................................................................55

5.2.2.1 Selection of the control circuit .................................................56

5.2.2.2 Selection of the program .........................................................56

5.2.2.3 Selection of day of the week and cycle ...................................56

5.2.2.4 Programming switching times and cycle temperatures ...........57

5.2.3 "System Parameters" menu..................................................................72

5.2.3.1 Language selection .................................................................72

5.2.3.2 Time program..........................................................................73

5.2.3.3 Operating mode ......................................................................74

5.2.3.4 Parameter reset ......................................................................76

5.2.3.5 Complete reset........................................................................77

5.2.4 "DHW" menu ........................................................................................77

5.2.4.1 Night-time hot-water temperature............................................78

5.2.4.2 Legionella protection day ........................................................78

5.2.5 "Direct Heating Circuit" / "Mixed Heating Circuit 1" / "Mixed

Heating Circuit 2" menu........................................................................78

5.2.5.1 Reduced operation..................................................................79

5.2.5.2 Heating system .......................................................................80

5.3 Error messages.................................................................................................80

5.4 Parameter settings ............................................................................................81

5.4.1 "Hydraulics" menu (HYDRAULIC) ........................................................81

5.4.2 "System parameters" menu (SYSTEM)................................................85

5.4.3 "Hot-water circuit" menu (DHW) ...........................................................89

5.4.4 "Direct heating circuit" menu (UNMIXED CIRC) ...................................92

5.4.5 "Mixed heating circuit 1 / 2" (MIX.VALVE - 1 / MIX.VALVE - 2)

menus ...................................................................................................95

5.4.6 "Heat generator" menu (HEAT GENER................................................99

4 EN2H-0221GE51 R0808

SDC / DHC Contents

5.4.7 "District hot water" menu (DIST.HEATING) ........................................104

5.4.8 "Return increase" menu (RETURN CONTR)......................................105

5.4.9 "Solar" menu (SOLAR) .......................................................................106

5.4.10 "Solid" menu (SOLID FUEL) ...............................................................107

5.4.11 "Buffer" menu (BUFFER)....................................................................108

5.4.12 "Total flow regulation" menu (MAIN SUPPLY)....................................109

5.4.13 "Cascading" menu (CASCADE) .........................................................110

5.4.14 "Data bus" menu (BUS) ......................................................................111

5.4.15 "Relay test" menu (RELAY TEST ) ....................................................111

5.4.16 "Error messages" menu (ALARM) ......................................................112

5.4.17 "Error messages 2" menu (ALARM 2) ................................................113

5.4.18 "Sensor calibration" menu (SENSOR ADJ.) .......................................113

6 Control Functions ......................................................................................................114

6.1 Variable adjustment of the hydraulic parameters (variable inputs and

outputs) ...........................................................................................................114

6.1.1 Connection and settings table ............................................................116

6.2 Switching time program enabling ....................................................................117

6.3 Suppressing the cycle temperature on time program level..............................118

6.4 Enabling "Separate Control Mode"..................................................................118

6.5 Switching from SDC to DHC ...........................................................................119

6.6 Selection of hydraulic parameter presettings ..................................................119

6.7 The variable inputs and outputs of device series SDC/DHC 43 ......................119

6.8 General functions and their operation .............................................................120

6.8.1 Outside temperature sensing..............................................................120

6.8.1.1 Building type .........................................................................120

6.8.2 Heating circuit outside temperature assignment.................................121

6.8.3 Outside temperature emergency operation value...............................121

6.8.4 Outside temperature disable...............................................................122

6.8.5 Climate zone.......................................................................................122

6.8.6 Design temperature ............................................................................122

6.8.7 Summer switch-off..............................................................................123

EN2H-0221GE51 R0808 5

Contents SDC / DHC

6.8.8 System frost protection.......................................................................124

6.8.9 Pump forced operation .......................................................................127

7 Hydraulic Components..............................................................................................128

7.1 Heat generator: Boiler .....................................................................................128

7.1.1 Heat generator start-up protection......................................................128

7.1.2 Heat generator minimum temperature limit.........................................129

7.1.3 Maximum temperature limit heat generator ........................................130

7.1.4 Heating circuits minimum temperature limit ........................................130

7.1.5 Heat generator sensor control mode ..................................................130

7.1.6 Minimum burner runtime.....................................................................131

7.1.7 Switching: Multi-stage heat generator/Switching differential...............131

7.1.8 Operation for modulating burners .......................................................136

7.1.9 Modulation of P part (Xp)....................................................................137

7.1.10 Modulation of sample time Ta.............................................................137

7.1.11 Modulation of integral action time Tn ..................................................138

7.1.12 Modulation of runtime .........................................................................138

7.1.13 Modulation of start time ......................................................................138

7.1.14 Modulation of start power ...................................................................139

7.1.15 OpenTherm ........................................................................................140

7.1.16 Use of boiler sensor 2.........................................................................141

7.1.17 External heat generator cut-off ...........................................................141

7.1.18 Heat generator forced discharge ........................................................141

7.1.19 Exhaust gas temperature monitoring ..................................................142

7.1.20 Burner counter mode ..........................................................................143

7.2 Heat generation, heat exchanger, district heating ...........................................144

7.2.1 On/Off operation of the district heating valve......................................145

7.2.2 Continuous heat exchanger valve control...........................................145

7.2.3 District heating return temperature limit..............................................147

7.2.4 Return temperature limit for hot-water loading....................................149

7.2.5 Hot-water pre-regulator with district heating systems .........................150

7.2.6 Mode of operation: Hot-water pre-control ...........................................151

6 EN2H-0221GE51 R0808

SDC / DHC Contents

7.2.7 Quick hot-water control.......................................................................152

7.2.8 Mode of operation of hot-water control mode "external

operation" ...........................................................................................154

7.2.9 Conditional parallel operation for mixed heating circuits.....................155

7.2.10 Circulation pump control mode ...........................................................155

7.2.11 Switch-off of district heating control ....................................................156

7.2.12 Return interval flushing .......................................................................156

7.2.13 Heat meter for additional limitation according to the volume flow

or thermal output ................................................................................156

7.2.14 Charging pump (CHP) ........................................................................157

7.2.15 Primary pump .....................................................................................158

7.2.16 Boiler circuit pump ..............................................................................158

7.2.17 Return increase ..................................................................................159

7.2.17.1 Bypass pump (RBP)..............................................................160

7.2.17.2 Return maintenance through controlled feed water addition 160

7.2.17.3 Indirect return increase .........................................................161

7.3 Heating circuit .................................................................................................161

7.3.1 General heating circuit functions ........................................................161

7.3.1.1 Heating curve........................................................................161

7.3.1.2

7.3.1.3 Reduced operation................................................................164

7.3.1.4 Heating system .....................................................................164

7.3.1.5 Heating circuit temperature limit............................................164

7.3.1.6 Heating circuit temperature offset .........................................165

7.3.1.7 Heating circuit pump extended running time .........................165

Heating curve setting (heating curve)....................................162

7.3.1.8 Screed function .....................................................................165

7.3.2 Heating circuit constant temperature control ......................................168

7.3.3 Fixed-value control .............................................................................168

7.3.4 Consideration of the room temperature/room influence......................169

7.3.4.1 Heating circuit room connection............................................169

7.3.4.2 Heating circuit room factor ....................................................170

EN2H-0221GE51 R0808 7

Contents SDC / DHC

7.3.4.3 Heating circuit room controller ..............................................171

7.3.4.4 Switch-on/switch-off optimisation ..........................................171

7.3.4.5 Room setpoint ramp..............................................................175

7.3.4.6 Heating limit function.............................................................175

7.3.4.7 Heating circuit room frost protection limit ..............................177

7.3.4.8 Mixed heating circuits cooling switch-over ............................177

7.3.4.9 Heating circuit name .............................................................180

7.3.4.10 Room thermostat function (maximum room

temperature limit) ..................................................................181

7.3.5 Hot-water production ..........................................................................187

7.3.5.1 Hot-water tank loading (SLP) ................................................187

7.3.5.2 Circulation pump (CIR.).........................................................194

7.3.6 Solar/Solid fuel/Buffer.........................................................................196

7.3.6.1 Solar function ........................................................................196

7.3.6.2 Buffer tank function ...............................................................199

7.3.6.3 Solid fuel function..................................................................212

7.3.7 Tank loading switch-over....................................................................213

7.3.8 Hydraulic buffer relief (HBR)...............................................................215

Easy enabling and disabling of a heating pump .................................216

7.3.9

7.3.10 Other system components..................................................................217

7.3.10.1 Global fault message input....................................................217

7.3.10.2 Global fault message output .................................................217

7.3.10.3 Timer 217

7.3.10.4 External switching modem ....................................................218

7.3.10.5 External information ..............................................................219

7.3.10.6 Demand contact....................................................................219

7.3.11 Bus communication ............................................................................221

7.3.11.1 Bus address of central device ...............................................221

7.3.11.2 Control functions via the data bus.........................................222

7.3.11.3 Operation of wall devices ......................................................227

7.3.12 Cascading of heat generators in the bus system................................232

8 EN2H-0221GE51 R0808

SDC / DHC Contents

7.3.12.1 General description of cascading of control devices .............232

7.3.12.2 Function of the cascade parameters.....................................233

7.3.12.3 Mode of operation of cascade control ...................................234

7.3.13 Commissioning, maintenance and troubleshooting help ....................237

7.3.13.1 Automatic set function...........................................................237

7.3.13.2 Emission measurement (not for DHC 43) .............................238

7.3.13.3 Relay/function test.................................................................239

7.4 Error messages...............................................................................................243

7.4.1 Basic display/fault stack fault messages ............................................248

7.4.1.1 Sensor calibration .................................................................249

7.4.1.2 Full controller reset................................................................249

7.4.1.3 Controller time correction ......................................................249

8 Technical data............................................................................................................250

8.1 General ...........................................................................................................250

8.1.1 Installation recommendations .............................................................251

8.2 Sensor resistance values ................................................................................251

8.2.1 NTC 20 ...............................................................................................251

8.2.2 PT 1000 ..............................................................................................252

8.3 Sensor measurement ranges ..........................................................................252

8.4 Digital inputs....................................................................................................253

9 Log ..............................................................................................................................254

Index....................................................................................................................................255

EN2H-0221GE51 R0808 9

Contents SDC / DHC

10 EN2H-0221GE51 R0808

SDC / DHC Software version

1 Software version

This documentation is valid for software version V 3.0 of your control device. The software version is displayed after switch-on for approx. 8 s. If you are using an older software version, please contact your heating technician.

2 Safety instructions

2.1 Intended use

The SDC / DHC Smile family of controllers was designed for the sole purpose of regulating and controlling hot-water, heating and district heating systems (including hot-water production) that do not exceed a maximum flow temperature of 120 °C.

2.2 Requirements for start-up

ATTENTION

The heating system must be complete and filled with water so that the pumps do not run dry and the heating boiler is not damaged.

The control equipment must be installed in accordance with the installation instructions.

All electrical connections (voltage supply, burner, mixer motor, pumps, sensor wiring etc.) must be carried out by the technician in accordance with the applicable VDE regulations and correspond with the circuit diagrams.

If floor heating is connected, a limiting thermostat must also be installed in the flow line after the heating circuit pump. This switches off the pumps at excessive flow temperatures.

Before starting up the controller, have the heating technician check all requirements listed above.

NOTE

The current time and date are already set at the factory and are backed up by a battery.

The time switch functions based on a basic program and the control functions are preset for common heating systems with lowtemperature boilers.

EN2H-0221GE51 R0808 11

Safety instructions SDC / DHC

2.2.1 Power supply

Do not disconnect the controller from the mains supply!

The battery for saving all individualised data is otherwise unnecessarily strained. The frost-protection function of the controller is deactivated.

2.2.2 Connection conditions

All electrical connection work may only be carried out by qualified personnel!

2.2.3 Cable cross-sections

1.5 mm2 for all cables carrying 230 V (power supply, burner,

pumps, actuator).

0.6 mm2 for bus cables (recommended type J-Y(St)Y 2 x 0.6).

0.5 mm2 for sensors, selectors and analog signal cables.

2.2.4 Maximum cable lengths

Sensor, selector and analog inputs

We recommend using cables no longer than 200 m. Longer connection lines could be used, but increase the risk of interference.

Relay outputs

Unlimited cable length.

Bus connections

Max. length of 100 m from the first bus subscriber to the last one (incl. wall modules).

2.2.5 Cable installation

Install cables for sensors apart from the cables carrying 230 V! Branch boxes in the sensor cable must be avoided!

12 EN2H-0221GE51 R0808

SDC / DHC Safety instructions

2.2.6 Grounding and zeroing

Local regulations on the connection of equipment must be observed!

2.3 Hot-water temperature greater than 60 °C

ATTENTION

Note that there is a danger of scalding at all hot-water drawoff points (kitchen, bathroom etc.) in the following cases. Add sufficient cold water in these cases.

Automatic anti-

legionella mechanism

When the automatic anti-legionella mechanism is activated, the hot water is automatically heated to the anti-legionella temperature (65 °C at the factory) on the selected day and at the selected time to kill any legionella bacteria found in the hot-water tank.

Manual mode /

Emission

measurement

In the manual mode / emission measurement operating mode, the hot water is heated up to the highest possible boiler temperature, as the burner and all pumps are switched on and the mixer is opened fully. There is an acute danger of scalding at all connected hot-water draw-off points! Add sufficient cold water or switch off the hot-water loading pump (at the switch of the pump, if present). Heating and hot water are in unregulated continuous operation. This operating mode is for special use by the chimney sweep for emission measurement or if the controller is defective. The high hot-water temperatures can be prevented, however, by setting the boiler thermostat to a max. boiler temperature of approx. 60 °C.

EN2H-0221GE51 R0808 13

Safety instructions SDC / DHC

2.4 Connection of accessory parts

WARNING

According to VDE 0730, a separator for each mains terminal is to be provided in the voltage supply to the control equipment. Observe the local regulations regarding grounding and zeroing.

As soon as the mains voltage is applied to terminals 21, 22, 2, 6, 12 and 18, headers X3 and X4 can also carry mains voltage.

If the heating circuit and hot-water loading pumps do not have an On / Off switch, but manual switch-on and switch-off capability is still desired, the appropriate switches must be installed by the customer. All accessory parts (sensors, selectors etc.) are to be connected to the respective circuit diagram.

2.5 Maintenance and cleaning

The controller is maintenance-free. The device can be cleaned externally with a moist (not wet) cloth.

14 EN2H-0221GE51 R0808

SDC / DHC Safety instructions

2.6 Safety precautions for EMC-compliant installation

Mains lines and sensor/data bus lines must be installed separate from each other. A minimum of 2 cm space must be present between the lines. It is permissible to cross lines.

a Mains 230 V AC x 15 cm

b Data bus line 12 V AC y 2 cm

For control devices with their own mains connection, separate installation of mains and sensor/bus lines must absolutely be ensured. If cable ducts are used, they are to be provided with cutoff bridges.

EN2H-0221GE51 R0808 15

Safety instructions SDC / DHC

When installing control or wall devices, a minimum spacing of 40 cm to other electrical equipment with electromagnetic emissions, e.g. relays, motors, transformers, dimmers, microwave ovens and televisions, audio speakers, computers, cordless telephones etc., is to be ensured.

x 40 cm

A minimum spacing of 40 cm is to be ensured between wall devices and central devices. Multiple central devices in the data bus system can be mounted directly next to one another.

16 EN2H-0221GE51 R0808

SDC / DHC Safety instructions

The mains connection of the heating system (boiler – panel – control equipment) must be designed as a separate circuit. Neither fluorescent lamps nor any machines which are potential sources of interference may be connected/connectable.

a Safety fuse 16 A

b Boiler room emergency switch

c Connect boiler room lighting and electrical outlets to

separate circuits only!

d Wall devices

e Heat generator

Shielded cables must be used for the data bus lines.

For a recommended layout, see 8 Technical data, pg. 250

EN2H-0221GE51 R0808 17

Safety instructions SDC / DHC

The earth connection of the cable shielding must occur on one side at the protective conductor connection, e.g. at the cladding plate of the heat generator, protective conductor terminal etc. Multiple earth connections of a single cable are not permissible (buzzing loop).

a No earth connection here! b Central device

18 EN2H-0221GE51 R0808

SDC / DHC Safety instructions

With star-topology data bus systems, double earth connections may not be made. The earth connection must be made on one side of the star!

a Shielding b Two-lead data bus line

c Distributor terminal d Branch box

The outside sensor may not be installed near transmitters or receivers (e.g. on garage walls near garage door opener receivers, amateur radio antennas, radio alarm systems or directly next to large transmission equipment etc.).

EN2H-0221GE51 R0808 19

Overview SDC / DHC

3 Overview

The modular SDC / DHC control device is available in an installable switch cabinet version and a surface-mounted wall version with the following equipment features:

Type

SDC 3-10

SDC 3-40

SDC 7-21 1)

SDC 9-21 2)

SDC 12-31 3)

Number of output relays

Burner stage 2

District heating valve

CLOSED

Burner stage 1

Direct heating circuit

Variable output 3

Mixed heating circuit 1

Mixed heating circuit 2

Tank loading pump

Variable output 2

3 – x x – – x –

3 – – – x – – – –

7 – x x x – x – –

x x x x – x x x + two variable relays

x x x x x x x x + two variable relays

DHC 43-1

DHC 43-2

DHC 43-3

Variable output 1

20 EN2H-0221GE51 R0808

SDC / DHC Abbreviations

4 Abbreviations

The following abbreviations are used in this documentation/in the display of the control device:

RED

OS2

FGS

BUS

OC1

OC2

DCP

ECO

EHR

SFB

SFR

Lowering operation

Outside sensor

Outside sensor 2

Flue gas sensor

Outside temperature

System data bus

Burner stage 1 operating hour counter

Burner stage 2 operating hour counter

Direct heating circuit

Direct heating circuit pump

Switch-off operation

Electric heating rod

Solid fuel boiler sensor

Solid fuel buffer sensor

Fixed-value control

BS 2

BLP

RBP

SD I

SD II

TLP

SLS

SLSS

SFD

SLP

STL

VO1

Buffer sensor 2 (bottom)

Buffer loading pump

Return bypass pump

Return pump

Switching differential I

Switching differential II

Tank sensor

Tank loading pump

Solar loading switch-over

Solar loading switch-over sensor

Solar forced dissipation

Solar loading pump

Stratified tank loading pump

Variable output (general)

Variable output 1

SFP

CRS

CTBS

CFS

MHP

Solid fuel pump

Pulse input

Boiler circuit pump

Constant control

Collector return sensor

Collector tank/buffer sensor

Collector flow sensor

Mixer motor

Mixed heating circuit

Mixed heating circuit pump

Switching time program

Buffer sensor (top)

VO2

VI1

VI2

VI3

FM1

FM2

PHE

HGS

CIR

CHP

Variable output 2

Variable input (general)

Variable input 1

Variable input 2

Variable input 3

Flow sensor of mixed heating circuit 1

Flow sensor of mixed heating circuit 2

Parallel heat generator enable

Heat generator

Heat generator sensor

Wall device for room temperature sensing

Hot water

Circulation pump

Charging pump

EN2H-0221GE51 R0808 21

Operation SDC / DHC

5 Operation

5.1 Display and operating elements

1011

1 "Manual mode" / "Emission measurement" button (not on

district heating controllers)

2 "Operating modes" button (basic display)

3 "Switching time programs" / "Holiday programs" button

4 "System information" button

5 Display

6 Cover clip for service socket

7 "Daytime room temperature" button

8 "Night-time room temperature" button

9 "Daytime hot-water temperature" button

10 Input button (press / turn)

11 Operating mode symbols (heating programs)

22 EN2H-0221GE51 R0808

SDC / DHC Operation

5.1.1 Display (basic display)

3 4

1 Day of the week / Date 4 Operating mode symbols

2 Time 5 Heat generator temperature

3 Active operating mode

The illumination of the display is switched on by pressing any button or using the input button î and switches off automatically

if no buttons are pressed for a longer period of time.

During start-up of the unit and after a power failure, a segment test with automatic fault diagnosis is carried out. The respective device type and the software version number then appear briefly.

The basic display that then appears shows the day of the week, the date, the time and the heat generator temperature in automatic mode. Different values appear in the basic display depending on the set operating mode (AUTOMATIC, PARTY etc.). Thus, for example, in the ABSENT operating mode, the indication ABSENT TIL appears instead of the date and the return date instead of the temperature. Active summer deactivation is

indicated by a beach umbrella symbol

protection is indicated by a snowflake symbol

À, and active frost

Á.

EN2H-0221GE51 R0808 23

Operation SDC / DHC

5.1.2 Operating elements

5.1.2.1 Input button (press / turn)

By pressing once, you can:

• Confirm input / values

By pressing and holding (approx. 3 s), you can:

• Switch to the menu-selection level

• Move up one menu level

By turning the input button î, you can:

• Change values (clockwise increases called-up values, anticlockwise decreases them)

• Navigate through menus

5.1.2.2 "Daytime room temperature" button

Sets the desired room temperature (room setpoint) in automatic

mode during the heating cycles and in the PARTY and HEATING

operating modes. In operating mode 1, the set value for all heating circuits is the same. In operating mode 2, the set value applies for the respective heating circuit. To set the operating mode, see 5.2.3.3 Operating mode, pg. 74.

Setting

► Press ¥ button.

► Set flashing room temperature specification to the desired

value by turning the input button î.

► Confirm set value by pressing the

button î.

¥ button or the input

Alternative: Automatic acceptance of the value after the set information time (see 5.1.2.7 "System information" button, pg. 35).

Factory setting

Setting range

20 °C

5 ... 30 °C

24 EN2H-0221GE51 R0808

SDC / DHC Operation

5.1.2.3 "Night-time room temperature" button

Sets the lowered room temperature in automatic mode between

the heating cycles and in the ABSENT and RED. HEATING

operating modes.

In operating mode 1, the set value for all heating circuits is the same. In operating mode 2, the set value applies for the respective heating circuit. To set the operating mode, see

5.2.3.3 Operating mode, pg. 74.

Setting

► Press ¦ button.

► Set flashing room temperature specification to the desired

Factory setting

Setting range

5.1.2.4 "Daytime hot-water temperature" button

Setting

value by turning the input button

î.

► Confirm set value by pressing the ¦ button or the input

button î.

Alternative: Automatic acceptance of the value after the set information time (see 5.1.2.7 "System information" button, pg. 35).

16 °C

5 ... 30 °C

Sets the daytime hot-water temperature during the hot-water operational-readiness times in automatic mode and in the PARTY and HEATING operating modes. This set value also applies for exclusively hot-water operation (manual summer operation).

► Press § button.

► Set flashing hot-water temperature to the desired value by

turning the input button î.

► Confirm set value by pressing the § button or the input

button î.

Alternative: Automatic acceptance of the value after the set information time (see 5.1.2.7 "System information" button, pg. 35).

Factory setting

50 °C

EN2H-0221GE51 R0808 25

Operation SDC / DHC

Setting range

One-time hot-water

circuit loading

5.1.2.5 "Operating mode" button (basic display)

5 °C (hot-water economy temperature) ... Maximum hot-water heater temperature limit (service setting)

Pressing and holding (approx. 3 s) the § button brings you to the reload function, where the reload time can be set in minutes. With a reload time of 0 minutes, loading is started once and the hot-water tank is loaded to the daytime setpoint. The time for this superimposed hot-water circuit loading can be set between 0 and 240 minutes. The current week program is superimposed here.

Sets the operating mode and returns to the basic display from every operating level.

26 EN2H-0221GE51 R0808

SDC / DHC Operation

Overview of the operating modes

Symbol Operating mode Display Setting

ABSENT

PARTY

AUTOMATIC

SUMMER

P1 (P2, P3)*, return date

P1 (P2, P3)*, party end time

P1 (P2, P3)*

P1(P2, P3)*

HEATING

RED. HEATING

STANDBY

* P2 and P3 only after enabling, see "System Parameters"

menu, parameter 2 = P1 to P3

EN2H-0221GE51 R0808 27

Operation SDC / DHC

The selected operating mode appears in plain text, whereby a marking at the bottom edge of the display points to the respective operating mode symbol at the same time. In operating mode 1, the set value for all heating circuits is the same. In operating mode 2, the set value applies for the respective heating circuit. To set the operating mode, see 5.2.3.3 Operating mode, pg. 74.

Setting

► Press button.

► Select operating mode by turning the input button î. The

marking is located above the corresponding operating mode symbol.

► Confirm set operating mode by pressing the button or the

input button î.

► With short-term operating modes (ABSENT, PARTY), set the

Return to the basic

display

NOTE

5.1.2.5.1 Absence mode (short-term program)

desired value by turning the input button î and confirm with the button or the input button î.

Alternative: Automatic acceptance of the value after the set information time (see 5.1.2.7 "System information" button, pg. 35).

Press the button for approx. 3 s to return to the basic display from any operating level.

Holiday mode is set via the "Switching time programs / Holiday programs" button (see 5.1.2.6 "Switching time programs / Holiday programs" button, pg. 33).

With the ABSENT operating mode, heating operation is temporarily deactivated and protected from frost during brief absences. During the absence, all heating circuits are adjusted to the specified lowered room temperature. Once the set time expires, the heating circuits automatically return to the operating mode that was active before the switch to the absence operation. Short-term programs such as PARTY or ABSENT are skipped here.

Setting

Application

See 5.1.2.5 "Operating mode" button (basic display) , pg. 26

Short absence while heating operation is active.

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SDC / DHC Operation

Cancellation

Factory setting

Setting range

An active absence program can be cancelled in case of early return.

► Press button.

► Turn input button î and switch to automatic operation.

The active absence program has been cancelled.

P1 as from activation

P1 (P2, P3) / 0.5 to 24 h to the current time

P1 (P2, P3)

Program-controlled resumption of heating operation. After activation of the absence program, heating operation is interrupted until the following switch-on time of the current automatic program P1 (or P2 or P3, if enabled).

0,5 ... 24 h

The set value is added on to the current time and represents the return time. When the absence program is called up again, the last set value is saved and suggested as the initial value.

Display

An active absence program appears in the basic display with information on the return time.

5.1.2.5.2 Party mode (short-term program)

Party mode causes one-time intermediate heating of all heating circuits up to a specified point in time and bridges an upcoming or already active absence cycle totally or partially. Once the set time expires, the heating circuits automatically return to the operating mode that was active before the party program. Short-term

programs such as ABSENT or PARTY are skipped here.

Setting

Application

See 5.1.2.5 "Operating mode" button (basic display) , pg. 26

One-time extension of heating operation or intermediate heating during lowering operation outside the schedule.

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Operation SDC / DHC

Cancellation

Factory setting

Setting range

Display

An active party program can be cancelled early.

► Press button.

► Turn input button î and switch to automatic mode.

The active party program has been cancelled.

P1 as from activation

P1 (P2, P3) / 0.5 to 24 h to the current time P1

P1 (P2, P3)

Program-controlled resumption of heating operation. After activation of the party program, heating operation is continued until the following switch-on time of the current automatic program P1 (or P2 or P3, if enabled)

0,5 ... 24 h

The set value is added on to the current time and represents the end of the party time. When the party program is called up again, the last set value is saved and suggested as the initial value.

An active party program appears in the basic display with information on the party end time.

5.1.2.5.3 Automatic mode

In automatic operation, max. three time programs with different heating operation times are available. They are called up during

start-up as factory-set and unlosable default programs P1, P2 or P3 and can, if necessary, be overwritten with their own switching times in the "Timeprograms" menu (see 5.2.2 "Timeprograms" menu, pg. 55).

NOTE

Default programs P2 and P3 cannot be selected until the PROGRAM = P1 to P3 parameter is enabled in the "System Parameters" menu. Without enabling, only program P1 is active.

Setting

See 5.1.2.5 "Operating mode" button (basic display) , pg. 26

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