Honeywell SDC heating and district heating controller User manual

EN2H-0221GE51 R0808
Smile SDC heating and
district heating controller
SERVICE MANUAL

EN2H-0221GE51 R0808

SDC / DHC Contents
EN2H-0221GE51 R0808 3
Contents
1Software version ..........................................................................................................11
2Safety 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
3Overview.......................................................................................................................20
4Abbreviations ...............................................................................................................21
5Operation......................................................................................................................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
6Control 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
7Hydraulic 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
addition160
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
8Technical 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
9Log ..............................................................................................................................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 low-
temperature 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 mm2for all cables carrying 230 V (power supply, burner,
pumps, actuator).
0.6 mm2for bus cables (recommended type J-Y(St)Y 2 x 0.6).
0.5 mm2for 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 draw-
off 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 cut-
off 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
éæ
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