Honeywell SDC 3-40, SDC 3-10, SDC 7-21, SDC 9-21, SDC 12-31 Service Manual
...
EN2H-0221GE51 R0808
Smile SDC heating and
district heating controller
SERVICE MANUAL
EN2H-0221GE51 R0808
SDC / DHC Contents
EN2H-0221GE51 R0808 3
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
Contents SDC / DHC
4 EN2H-0221GE51 R0808
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
SDC / DHC Contents
EN2H-0221GE51 R0808 5
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
Contents SDC / DHC
6 EN2H-0221GE51 R0808
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
SDC / DHC Contents
EN2H-0221GE51 R0808 7
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
Heating curve setting (heating curve)....................................162
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
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
Contents SDC / DHC
8 EN2H-0221GE51 R0808
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
7.3.9
Easy enabling and disabling of a heating pump .................................216
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
SDC / DHC Contents
EN2H-0221GE51 R0808 9
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
Contents SDC / DHC
10 EN2H-0221GE51 R0808
SDC / DHC Software version
EN2H-0221GE51 R0808 11
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.
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.
NOTE
Safety instructions SDC / DHC
12 EN2H-0221GE51 R0808
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!
SDC / DHC Safety instructions
EN2H-0221GE51 R0808 13
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.
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.
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.
Automatic anti-
legionella mechanism
Manual mode /
Emission
measurement
Safety instructions SDC / DHC
14 EN2H-0221GE51 R0808
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.
SDC / DHC Safety instructions
EN2H-0221GE51 R0808 15
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.
x
a
b
y
ç
é
æ
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.
Safety instructions SDC / DHC
16 EN2H-0221GE51 R0808
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
ç
é
æ
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.
SDC / DHC Safety instructions
EN2H-0221GE51 R0808 17
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.
ç
é
æ
ç
é
æ
a
b
c
d
e
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
Safety instructions SDC / DHC
18 EN2H-0221GE51 R0808
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
PE
b
ç
é
æ
ç
é
æ
a No earth connection here! b Central device
SDC / DHC Safety instructions
EN2H-0221GE51 R0808 19
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.).
Overview SDC / DHC
20 EN2H-0221GE51 R0808
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
Number of output relays
Burner stage 2
or
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
Variable output 1
SDC 3-10
3 – x x – – x –
SDC 3-40
3 – – – x – – – –
SDC 7-21 1)
7 – x x x – x – –
SDC 9-21 2)
7
+ two
variable
relays
x x x x – x x x
SDC 12-31 3)
10
+ two
variable
relays
x x x x x x x x
1)
DHC 43-1
2)
DHC 43-2
3)
DHC 43-3
SDC / DHC Abbreviations
EN2H-0221GE51 R0808 21
4 Abbreviations
The following abbreviations are used in this documentation/in the
display of the control device:
RED
Lowering operation
BS 2
Buffer sensor 2 (bottom)
OS
Outside sensor
BLP
Buffer loading pump
OS2
Outside sensor 2
RBP
Return bypass pump
FGS
Flue gas sensor
RP
Return pump
OT
Outside temperature
SD I
Switching differential I
BUS
System data bus
SD II
Switching differential II
OC1
Burner stage 1 operating hour
counter
TS
Tank sensor
OC2
Burner stage 2 operating hour
counter
TLP
Tank loading pump
DC
Direct heating circuit
SLS
Solar loading switch-over
DCP
Direct heating circuit pump
SLSS
Solar loading switch-over sensor
ECO
Switch-off operation
SFD
Solar forced dissipation
EHR
Electric heating rod
SLP
Solar loading pump
SFB
Solid fuel boiler sensor
STL
Stratified tank loading pump
SFR
Solid fuel buffer sensor
VO
Variable output (general)
FC
Fixed-value control
VO1
Variable output 1
SFP
Solid fuel pump
VO2
Variable output 2
PI
Pulse input
VI
Variable input (general)
BP
Boiler circuit pump
VI1
Variable input 1
CC
Constant control
VI2
Variable input 2
CRS
Collector return sensor
VI3
Variable input 3
CTBS
Collector tank/buffer sensor
FM1
Flow sensor of mixed heating
circuit 1
CFS
Collector flow sensor
FM2
Flow sensor of mixed heating
circuit 2
MM
Mixer motor
PHE
Parallel heat generator enable
MC
Mixed heating circuit
HG
Heat generator
MHP
Mixed heating circuit pump
HGS
Heat generator sensor
P1
Switching time program
WD
Wall device for room temperature
sensing
P2
Switching time program
HW
Hot water
P3
Switching time program
CIR
Circulation pump
BS
Buffer sensor (top)
CHP
Charging pump
Operation SDC / DHC
22 EN2H-0221GE51 R0808
5 Operation
5.1 Display and operating elements
1011
2
1
3
4
7
6
8
9
5
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)
SDC / DHC Operation
EN2H-0221GE51 R0808 23
5.1.1 Display (basic display)
1
2
3
4
5
C
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
À, and active frost
protection is indicated by a snowflake symbol
Á.
Operation SDC / DHC
24 EN2H-0221GE51 R0808
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.
► Press ¥ button.
► Set flashing room temperature specification 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).
20 °C
5 ... 30 °C
ð
¥
Setting
C
Factory setting
Setting range
SDC / DHC Operation
EN2H-0221GE51 R0808 25
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.
► Press ¦ button.
► Set flashing room temperature specification 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).
16 °C
5 ... 30 °C
5.1.2.4 "Daytime hot-water temperature" button
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).
50 °C
¦
Setting
C
Factory setting
Setting range
§
Setting
C
Factory setting
Operation SDC / DHC
26 EN2H-0221GE51 R0808
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.
5.1.2.5 "Operating mode" button (basic display)
Sets the operating mode and returns to the basic display from
every operating level.
Setting range
One-time hot-water
circuit loading
SDC / DHC Operation
EN2H-0221GE51 R0808 27
Overview of the operating modes
Symbol Operating mode Display Setting
ç
ABSENT
P1 (P2, P3)*, return
date
è
PARTY
P1 (P2, P3)*,
party end time
é
AUTOMATIC
C
P1 (P2, P3)*
ê
SUMMER
C
P1(P2, P3)*
ë
HEATING
C
ì
RED. HEATING
C
í
STANDBY
C
* P2 and P3 only after enabling, see "System Parameters"
menu, parameter 2 = P1 to P3
Operation SDC / DHC
28 EN2H-0221GE51 R0808
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.
► 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
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).
5.1.2.5.1 Absence mode (short-term program)
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.
See 5.1.2.5 "Operating mode" button (basic display) , pg. 26
Short absence while heating operation is active.
Setting
Return to the basic
display
NOTE
Setting
Application
SDC / DHC Operation
EN2H-0221GE51 R0808 29
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.
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.
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.
Cancellation
Factory setting
Setting range
Display
Setting
Application
Operation SDC / DHC
30 EN2H-0221GE51 R0808
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).
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.
See 5.1.2.5 "Operating mode" button (basic display) , pg. 26
Cancellation
Factory setting
Setting range
Display
C
NOTE
Setting
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