Oilon S203 User manual

Controller for three circuits
- control for 2 heating circuits
- 1 domestic hot water control
USER MANUALUSER MANUAL
S203
OILON LÄMPÖÄSSÄ
YM0055: Version1.0->

2
Turn the control knob
to navigate in the menu.
Press the control knobto
enter the menu and accept
the changes.
Control knob and OK
Cancel button
Basic view
Holding the key down for an ex-
tended period of time returns the
regulator to its basic mode. The
display shows the basic view, the
background light of the display
dims and the keyboard locks if the
locking function is in use.
This user manual consists of two parts. Issues that are intended for all users are presented in the first part
of user manual. The issues related to service mode are at the end of it. In addition there are issues, which
are only intended for persons in maintenance or who has in-depth knowledge of the control process.
The S203 is a heating controller for 3 circuits (two heating circuits and one hot water circuit). Wiring and
configurating selections define what is seen on the display screen.
Outdoor temp.
H1 Supply water
H2 Supply water
DHW Supply water
Automatic
Automatic
Automatic
-12.4°C
45.2°C
32.8°C
58.0°C
13:51 12.02.2021 Selection >
Not in use
Calibration
Calibration
Calibration
-12.4°C
45.2°C
32.8°C
58.0°C
13:51 12.02.2021
The calibration time is always performed when the
controller is started and every Monday at 9.00. The
calibration duration is 1.1 times the
actuator running time.
Outdoor temp.
H1 Supply water
H2 Supply water
DHW Supply water
Selection >
Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Domestic hot water control
Main menu
>
>
>
>
OK
OK

3
1 Display menus 4
1.1 Basic view 4
1.2 Menu structure 6
2 Inputs and outputs 7
3 Regulation of supply water in heating circuits 10
3.1 Info 10
3.2 Heating curve 12
3.3 Setting values 14
3.4 Control mode 15
3.5 Time programs 16
3.5.1 Weekly schedule 16
3.5.2 Exception schedule 17
3.5.3 Special days 17
3.5.4 Temp. level according to time program 17
4 Domestic hot water control 18
4.1 Time programs 20
5 Distribution valve control 22
6 Geothermal heating 22
6.1 Setting values 22
6.2 Status 23
7 Alarms 25
8 System settings 29
8.1 Setting date, time and language 29
8.2 Text message (SMS) settings 30
8.3 Network settings 31
8.4 Display settings 34
8.5 Type information 34
8.6 Lock code 34
9. Connection guide 35
9.1 Connections and configuration 38
10 Service settings 41
11 Restore settings and updates 54
12 Turn the display unit 55
Remote control options 56
Text message quick reference 57
Optional accessories 58
Tecnical information 60
Contents

4
Outdoor temp.
H1 Supply water
H2 Supply water
DHW Supply water
Automatic
Automatic
Automatic
-12.4°C
45.2°C
32.8°C
58.0°C
13:51 06.02.2021 Selection > 2
Central factors related to controlling heating are visible in the regulator’s basic view. When the unit is idle
state (keys have not been touched for a while) the display shows the basic view.
Dierent levels of display menus are used to make the S203 clear and easy to use. The basic view shows the
most important information for monitoring operation of the unit. Favourite views that can be changed by us-
ers enable them to easily access desired menus. Setting values needed by the user can easily be found in the
versatile menu structure.
1 Display menus
• A blinking exclamation
point means the unit has
active alarms.
• The number indicates the
number of active alarms.
Symbol indicates that
alarms are disabled.
Temperature measurements en-
able quickly determining proper
operation of the circuit.
Circuit control. This shows whether the cir-
cuit’s heating level has been continuously
forced to a particularly level or if the con-
troller is in manual mode.
Alarm indication
1.1 Basic view

5
Ouman S203 can generate alarms for several dierent reasons. In the
event of an alarm, an alarm window pops up showing detailed alarm
information and a beeping alarm signal goes on, if the alarm sound is
not turned o (see page 29).
If there are several unacknowledged alarms, the latest activated
alarm is always shown in the display. As soon as all active alarms have
been acknowledged, the alarm window disappears and the alarm sig-
nal goes o.
Alarm signal of all active alarms may also be muted by pressing Esc
button. When you press Esc, the alarm signal stops and the last alarm
windows disappear from the display.
You may look into the alarms later by going to ”Alarms” > ”Active
alarms”. If an alarm has not been acknowledged, an exclamation mark
will appear in the beginning of the row.
Alarm notice
Deviation alarm
PRIO1 GROUP1
H1 Supply water=10.2 °C
Received: 08.11.2020 02:27
Press OK to acknowledge the alarm
When controller is configured, it’s possible to disable alarms. When the
alarms are disabled, the symbol will be displayed in the main menu.
Alarms are enabled in the service mode → Alarm settings → Alarms:
Disabled/Enabled.
Acknowledging alarms: Press OK and
the alarm sound will me muted. If the
reason for the alarm is still present,
the exclamation point in the top right
will continue to blink.

6
Main menu Page 7
In the user manual
Page 10
Page 10
Page 18
Page 25
Page 29
Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Domestic hot water control
Dividing valve control
Geothermal heating
Alarms
System settings
Service
>
>
>
>
>
>
>
IInputs and outputs
Outdoor temp. -18.2 °C >
----------------------------------------------------
H1 Supply water 35.1 °C
H1 Return water 22.0 °C
LH1 Room temperature 21.5 °C
H1 Actuator control 22 %
---------------------------------------------------------
H2 Supply water 28.1 °C
Return water 21.1 °C
H1 Control circuit
H2 Control circuit
Info temperature information
Heating curve
Setting values
Control mode
Time programs
Info temperature information
Heating curve
Setting values
Control mode
Time programs
>
>
>
Automatic >
>
>
>
>
Automatic >
>
DHW Domestic hot water control
Info
Setting values
Control mode Automatic
>
>
>
Alarms
Active alarms
Alarm history
Acknowldge all alarms
Reset alarm history
Routing schedule
Alarm receivers
>
>
>
>
>
>
System settings
Time 17:01
Date 12.02.2021
Language English
SMS settings
Network settings
Display settings
Type info
Lock code
>
>
>
>
>
>
>
Not in use >
1.3 Menu structure
Page 22
Geothermal heating
Setting value
States
Control mode
>
>
>
The service mode is for the
professional service persons
and it includes information
and parameters which are
not needed on daily basis.
The service code must be
given in order to access the
service menu.
Service
Geopro SH, Page 22
Dividing valve control
Info
Control mode Automatic
Trend display
>
>
>

7
2 Inputs and outputs
You can see the inputs and outputs of S203 which are configured
in use. Configuration of the inputs and outputs is done in ser-
vice menu (see p. 38-39).General measurements are temperature
measurements witch can be used for serial dierent purposes. The
default names of the measurements can be changed according to
use case.
If the sensor is not connected or is defective, the measurement
value shown will be -50°C (cross sensor) or +130 °C (sensor circuit
shorted). If a measurement is in manual mode, a hand image is
shown in the beginning of the line.
Inputs and outputs
Inputs and outputs are shown by the regulator in circuit-specific
groups. First H1, then H2 and last DHW
1
Main menu
Inputs and outputs
H1 Control circuit
H2 Control circuit
HW Domestic hot water control
>
>
>
>
Inputs and outputs
------ INPUTS AND OUTPUTS -----------------------
Outdoor temp. -18.2 °C
H1 Supply water 35.1 °C
H1 Return water 22.0 °C
H1 Room temperatur 21.5 °C
H1 Actuator control 22 %
H2 Supply water 28.1 °C
H2 Return water 21.1 °C
>
>
>
>
>
>
>
>
If a GSM modem is connected to the controller, you can read measure-
ment information with a mobile phone. (If the device ID is in use, add
the device ID in front of the key word, e.g., TC01 Inputs)
Send a message: Inputs
The controller sends the current measurement information to your
mobile phone.
Send a message: Outputs
The controller sends a message showing the status of the controls.
Key word:
INPUTS Inputs:
Outdoor temp. -18.2 °C /
H1 Supply water 35.1 °C/ H1
Return water 22.0 °C /
H1 Room temperature 21.5 °C /
Outputs:
H1 = Actuator control = 25 % /
H2 Actuator control = 26 % /
DHW Actuator control = 52 %/
P2 Pump control = On
Outputs
Inputs
T8-T80, V7.0-V30.0 and Vs6.0-Vs12.0
Outdoor temperature M1
H1 Supply water M2
H2 Supply water M5
Accumulator upper part M10
Accumulator lower part M11
Hot gas M12
Compressor running infor-
mation (NO)
M13
Compressor status DI2 Information if single phase compressor is in use or not
Heating
resistor
Compressor
S203
Act.1
Act.2
M1
M2
MM
M5
M10
M11
M12
H1H2

8
Inputs and outputs
V8-15, T8-T60 and S8-S15: Full eect geothermal heating
Outdoor temperature M1
H1 Supply water M2
H2 Supply water M5
Accumulator upper part M10
Accumulator lower part M11
Hot gas temperature M12
Compressor’s running
information (NO)
M13
P2 Pump (Alarm/ Indication) M15
P3 Pump (Alarm/ Indication) M16
Electrical heating resistor DI1
Compressor DI2 Information if single phase compressor (contact closed= 1~compr.).
Inputs and outputs
V8-15, T8-T60 and S8-S15: Limited eect geothermal heating
Outdoor temperature M1
H1 Supply water M2
H2 Supply water M5
Accumulator upper part M10
Accumulator lower part M11
Hot gas temperature M12
Compressor’s running
information (NO)
M13
P2 Pump (Alarm/ Indication) M15
P3 Pump (Alarm/ Indication) M16
Electrical heating resistor DI1
Compressor DI2 Information if single phase compressor (contact closed= 1~compr.).
Electrical
heating
resistor
Compressor
Cold water
Heating
network
P2 Pump
H1 Supply water
S203
Domestic
hot water
Actuator.1
M1
M2
M11
M10
M12
M13
Full eect
geothermal
heating
Electrical
heating
resistor
Cold water
Domestic
hot water
Limited eect
geotherman
heating
M11
Actuator1
M10
Compressor
P2 Pump
S203 M1
M2
M12 Heating
network
Brine
H1 Supply water

9
Inputs and outputs
Geopro GS
Outdoor temperature M1
H1 Supply water M2
H2 Supply water M5
Brine outfow M7 The temperature of the ground ciruit’s brine outflow
(returning to the ground)
Accumulator upper part M10
Accumulator lower part M11
Heating accumulator M12
Compressor’s running information(NC) M13
Compressor over current
protection
M14
Heating resistor over heating protec-
tion
DI1
HW Extra heating button DI2
Changing valve status:
Heating/ HW accumulator
TR1, TR2 TR1: Heating ON
TR2: Heating OFF
H1 e.g. floor heating
H2 e.g. bathrooms’
floor heating
compressor and
brine pump
Brine
Electrical heating resistör
Heating
boiler
Changing
valve
VV
Domestic water connections
Domestic hot
water boiler
M2
M10
M11
M12
M7
Act.2
Act.1
M5
H1
H2
Measurement Range Measurement information
Geopro SH
H1 Supply water M2
H2 Supply water M5
Brine outflow M7
Boiler Intake M8
Boiler Top M10
Boiler Middle M11
Boiler Down M12
Compressor’s running
information(NC)
M13
Heating resistor over heating
protection
DI1
Distribution valve control:
Control for the superheater
Control for the condenser
TR5,
TR6
Extra heat button
Cold water
H2 Supply water
H1 Supply water
El. heaterGround
El. heater
Compressor
Condenser Superheater
M2
M7
M9
M4
M10
S2
S1
M8
DV
M5
M12
M8
M7 M2
M10
M11
Note! If the middle sensor (M11) of the accumulator breaks, the controller uses
it as a control sensor sensor at the bottom of the charger (M12) and vice versa.

10
The S203 enables control of two dierent supply water circuits in-
dependently (H1 and H2).
Regulation of the temperature of supply water is controlled by
the outside temperature. Use of room temperature measurements
keeps room temperature more consistent.
3 Regulation of supply water in heating circuits
3.1 Info
The info shows which factors are aecting currently the supply
water temperature control. The starting point is the supply water
temperature according to the outdoor temperature (according to
the heating curve).
If a room sensor is connected to the controller, you can check which
factors currently determine the room temperature setting value
at the time of inspection.
In addition the info menu contains the measurement temperature
data aecting to supply water control and information of control
of actuators.
H1 (H2) Control circuit→ Info
Main menu
Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Control circuit
>
>
>
>
H1 Control circuit
Info
Heating curve
Setting values
Control mode
Time program
>
>
>
>
>
Factors eecting the supply water temp. Explanation
According to curve Supply water temperature setting according to the curve at the current outdoor
temperature.
Eect of parallel shift Eect of parallel shift on the supply water temperature.
Eect of time program Eect of weekly or exception schedule mode on the temperature of supply water.
Near the end of the temperature reduction time, the pre-increase operation can in-
crease the temperature of supply water.
Force control eect Supply water has been forced permanently to the desired temperature reduction
level (see Control mode selection).
Away -control eect ”Away” control for reduction of supply water temperature. The trigger can come
from the Home/Away switch, the controller or be sent as a text message (see 41).
Outdoor temp. delay eect The eect of the outdoor temperature delay on the supply water temperature.
Floor heat. anticipate Eect of anticipation of floor heating on the temperature of supply water.
Eect of autumn drying Eect of automatic autumn drying on the supply water temperature.
Return water compensation Increase in supply water temperature due to return water compensation.
Eect of room compensation Eect of room compensation on the supply water.
Room comp. time adjustment Additional correction for more precise room compensation based on realised regu-
lation (eect of I-regulation).
Bus compensation eect The amount of required compensation is determined by an external device to the
S203, for example from bus compensation to weather compensation.
Min limit eect Supply water temperature increase due to the minimum limit.
Max limit eect Supply water temperature drop due to the maximum limit.
Calculated supply water setting Current supply water temperature determined by the controller.
Controller is stopped for summer When the regulator is in summer function mode, the supply water information says
”Controller is stopped for summer.”
Controller is in manual control Control circuit mode is set to ” Manual control”.

11
Send a message: H1 Info.
The controller sends a supply water info from the H1 heating circuit
to your mobile phone that shows current supply water temperature
at the present and the factors eecting supply water control.
The message also includes the measurements which are aecting
the supply water control and the actuator control.
The message cannot be changed or sent back to the controller.
Key words:
H1 info:
--- H1 SUPPLY WATER-------------
According to curve 35.1 °C/
Away -control effect -6.0 °C/
Calculated supply water
setting = 29.1 °C.
--- MEASUREMENTS --------------
Supply water = 35.2 °C
Outdoor temp.= -10.7 °C
--- ACTUATOR CONTROL----------
Actuartor control = 20 %
H1 INFO
H2 INFO
Factors eecting the room temperature Explanation
----- ROOM TEMPERATURE --------------
Room temperature setting Room temperature setting set by the user.
Time program eect on room temp. Room temperature drop by weekly or exception schedule.
Away -control eect Home/Away mode for reduction of room temperature. The trigger can come from
the controller (see Inputs and outputs→ Home-Away-control), from the Home/Away
switch or be sent as a text message.
Force control eect Room temperature has been forced permanently to the desired reduction in room
temperature (see Control mode selection, p.13).
Eect of autumn drying Eect of automatic autumn drying on room temperature.
Calculated room temperature Current room temperature setting determined by the controller.
----- MEASUREMENTS -------------------
Supply water temperature Current measured supply water temperature.
Outdoor temp. The measured outdoor temperature. Outdoor temperature data is displayed if the delayed
outdoor temperature is not used in supply water control.
Delayed outdoor temperature If the heating mode is set to radiator heating, the delayed temperature measure-
ment can be used in supply water control. Typically 2 hours delay time is used
(time can be set in service menu). In supply water control the controller uses de-
layed measurement as an outdoor temperature.
Anticipated outdoor temperature If the heating mode is set to floor heating, the anticipated temperature measure-
ment can be used in supply water control. Typically 2 hours anticipation time is
used (time can be set in service menu). In supply water control the controller takes
into account the outdoor temperature change rate.
Room temperature The measured room temperature or room temperature from the bus. The measure-
ment is not necessarily taken into use in all control processes.
Delayed room temperature The floating average of room temperature. The controller uses this value, when
calculating the room compensation demand (the delay time of room temperature
measurement is adjustable, default 0.5 hours).
Return water temperature Presents measured return water temperature.
----- ACTUATOR CONTROL ---------------
Actuator control Current actuator control.
Actuator control 1 (2) Current actuator 2 control. If serial-driving is in use, actuator 1 will first open the
valve and the controller will then start up actuator 2.
Actuators control 50 % means that the valve 1 is totally open and the valve 2 is totally closed. 100% means
that both valves are open.

12
The supply water temperature for dierent outdoor temperatures
is set with heating curve. With S203 the heating
curve can be adjusted exactly to meet the needs of the facility
from five temperature points.
H1 (H2) Control circuit→ Heating curve
3.2 Heating curve
Note! Changes influence room temperature slowly. Wait at least
24 hours before readjusting the settings. Especially in buildings
with foor heating, the delays in room temperature changes are
quite long. The supply water minimum limit setting ensures that
pipes will not freeze. The maximum limit setting ensures that ex-
cessively hot water that could damage structures (e.g. parquet in
case of foor heating) does not enter the heating system.
If room temperature drops, make the curve steeper.
(Set higher values for supply water temperature at the outdoor
temperatures -20 °C, -10 °C and 0 °C).
H1 Control circuit
Supply water information
Measurements
Heating curve
Setting values
>
>
>
>
If room temperature rises, make the curve less steep.
(Set lower values for supply water temperature at the outdoor
temperatures -20 °C, -10 °C and 0 °C).
Setting Factory setting Explanation
5-point curve
Heating curve
-20 = 58 °C
0 = 41 °C
+20 = 18 °C
Min. limit: 18 Max limit: 75
-10= 50 °C
+10=28 °C
+20 -200°C
20
40
60
80 With 5-point curve you can change the curve to the outdoor temperature
values -20°C and +20°C as well as to three other outdoor temperatures be-
tween -20°C and +20°C. To change the outdoor temperature point, press OK
for a long period of time.
Min limit 18 °C Minimum allowed supply water temperature. A higher minimum temperature
is used in moist rooms and tiled rooms than in, e.g., rooms having a parquet
floor to ensure a comfortable temperature and removal of moisture in the
summer.
Max limit 75 °C Maximum allowed supply water temperature. The maximum limit prevents
the temperature in the heating circuit from rising too high, preventing dam-
age to pipes and surface materials. If, e.g., the heating curve setting is incor-
rect, the maximum limit prevents excessively hot water from entering the
network.
-20 =58 °C 54 °C
0 =41 °C 39 °C
+20 = 18 °C
Min.limit: 18 Max limit: 75
+20 -200°C
20
40
60
80
-10= 50 °C 47 °C
+10=28 °C
-20 =58 °C 62 °C
0 =41 °C 43 °C
+20 = 18 °C
Min.limit: 18 Max limit: 75
+20 -200°C
20
40
60
80
-10= 50 °C 53 °C
+10=28 °C
Heating curve
Heating curve

13
Settings of the heating curves of dierent heating modes
The preseted heating curves are typical average curves for the heating
mode in question. The curve may need to be adjusted to suit your build-
ing. The setting should be done during the cold period and if the room
compensation is in use, it should be switched o during the setting. The
curve is appropriate when the room temperature is maintained constant
although the outdoor temperature changes.
Radiator heating
Floor heating
Floor heating, moist. rooms
Radiator heating, steep curve
+20 -200°C
20
40
60
80
Typical heating curve settings:
5-point curve
4. Floor heating, moist. rooms
Heating curve
-20 = 31 °C
0 = 27 °C
+20 = 24 °C
Min limit: 23 Max limit: 45 +20 -200°C
20
40
60
80
3. Floor heating, normal curve
Heating curve
-20 = 33 °C
0 = 27 °C
+20 = 20 °C
Min limit: 18 Max limit: 45 +20 -200°C
20
40
60
80
1. Radiator heating, normal (default)
Heating curve
-20 = 50 °C
0 = 37 °C
+20 = 18 °C
Min limit: 18 Max limit: 75
-10= 44 °C
+10=28 °C
+20 -200°C
20
40
60
80
2. Radiator heating, steep curve
Heating curve
-20 = 58 °C
0 = 41 °C
+20 = 18 °C
Min limit: 18 Max limit: 75 +20 -200°C
20
40
60
80
-10= 50 °C
+10= 26 °C
-10= 30 °C
+10= 23 °C
-10=29 °C
+10=25 °C
Send message: H1 Heating curve
The controller sends a message showing curve settings.
You can change the settings by replacing the setting value with a
new one and sending a message back to the controller.
S203 will make the requested changes and send a new message
showing the changes made.
H1 Heating curve
H1 Heating curve
Suppl.w. (-20) = 50°C/
Outd.t. 2 = -10°C/
Suppl.w. 2 = 44°C/
Outd.t. 3 = 0 °C/
Suppl.w. 3 = 37°C/
Outd.t. 4 = 10°C/
Suppl.w. 4 = 28°C/
Suppl.w. (+20) = 18 °C
Minimum limit = 18°C/
Maximum limit = 45°C/
H2 Heating curve
H1 Heating curve
Suppl.w. (-20) = 54°C/
Outd.t. 2 = -10°C/
Suppl.w. 2 = 47°C/
Outd.t. 3 = 0 °C/
Suppl.w. 3 = 39°C/
Outd.t. 4 = 10°C/
Suppl.w. 4 = 23°C/
Suppl.w. (+20) = 20 °C
Minimum limit = 18°C/
Maximum limit = 45°C/

14
3.3 Setting values
Changing a setting:
H1 (H2) Control circuit→ Setting values
The regulator has two types of setting values: those that are al-
ways visible and those than can only be changed using a service
code (see page 39).
Both circuits have the same circuit-specific setting values.
• Choose the desired setting by turning the control knob.
• Press OK to go to the view where editing is possible. Change the
setting.
• Press OK to accept the change.
• If you want to exit edit mode without making any changes, press
ESC.
H1 Control circuit
Info
Heating curve
Setting values
Control mode Automatic
>
>
>
>
Send a message: H1 Settings.
The controller sends settings to your mobile phone. Editing the setting values:
write the new setting in place of the old setting and send a message back to the
controller. The controller sends back the setting as a confirmation.
H1 Setting values
H2 Setting values
H1 Setting values:
Room temperature = 21.5°C/
Temperature drop = 3.0°C/
Key words:
Setting Factory
setting Range Explanation
Room temperature setting 21.5 5... 50 °C Basic room temperature setting for the controller set by the user. This
setting value is not visible unless room compensation is in use. The
room compensation can be taken in use from the “Room temperature
settings” menu.
Summer function outdoor t.
limit
19.0 10 ... 35 °C Summer function outdoor temperature limit. When the measured
or forecast outdoor temperature exceeds the outdoor tempera-
ture limit of the summer function, the valve will be closed and the
circulation water pump will stop as selected. The summer function
is switched o, when the temperature drops 0.5 °C under sum-
mer function outdoor temperature limit. In this case, the pump is
switched on and the valve returns back to control mode.
Pump summer stop In use In use/
Not in use
If the controller is connected to control the pump, the pump can
be stopped when the summer function is active.
Valve summer close In use In use/
Not in use
The setting value is used to select whether or not the valve is
closed when the summer function is in use.
Autumn dry eect on supply water
Autumn dry eect on room temp.
4.0
1.0
0... 25 °C
0.0... 1.5 °C
The setting value defines how much the autumn dry function in-
creases supply water temperature. If room temperature regula-
tion is in use, the user sets how much the room temperature is
increased.
Room compensation settings
Room compensation In use In use/
Not in use
With room compensation it’s defined whether room temperature aects
regulation of supply water. If the measured room temperature diers
from its setting value, room compensation corrects the temperature of
the supply water.
Room compensation ratio 4.0 0...7 Coecient which is used in applying the dierence between room
measurement and the room setting value to the supply water set-
ting value. For example, if room temperature in radiator heating
is one degree below the setting value, supply water is raised by four
degrees.
Temperature drops
Temperature drop 3.0 0... 40 °C Temperature drop of supply water, which can start due to time pro-
grams or a Home/Away text message command or when selecting
continuous temperature drop as the circuit’s control mode. If room
temperature measurement has been taken into use, the temperature
drop is given directly as a room temperature drop.
Home/Away control Not in use In use/
Not in use
The Home/Away control changes the temperature levels. If transmit-
ter for general compensation is connected to controller, it’s not possibe
to connect Home/Away switch. In this case Home/Away mode can be
switched with SMS or from ”Inputs and Outputs” menu.

15
3.4 Control mode
H1 (H2) Control circuit→ Control mode
Manual mechanical
Automatic control is the mode that is used normally. You may
change automatic control to manual control here, and drive the
valve to the desired position. You can also force control to the de-
sired temperature level. A continuous mode command bypasses
possible scheduling programmes.
Control mode
Automatic
Continuous normal temp.
Continuous temp. drop
Manual
Manual mech. control
Send a message: H1 Control mode
The controller sends a return message in which a * appears in front
of the control mode in use. If you want to change the control mode,
move the * in front of the desired control mode and send the mes-
sage back to the controller. The controller will then send a return
message showing that it has switched to the desired control mode.
H1 Control mode:
*Automatic/
Continuous normal temp./
Continuous temp. drop/
Manual 0 %
L1 CONTROL MODE
H2 Control mode
H1 Control mode:
Automatic/
Continuous normal temp./
Continuous temp. drop/
*Manual 20 %
Mechanical manual control option is taken into use in the controller.
Connections and configuration → H1 (H2) Actuator control → Manual
mech. control ”Available”.
If you want the voltage controlled actuators to be controlled by manu-
al mechanical control, H1 actuator power supply must come from strip
connector 55 and H2 actuator power supply from strip connector 59.
The controller switches o the power supply, when the control mode
is manual mechanical control.
The valve position is set in the actuator when using mechanical man-
ual control.
Control mode Explanation
Automatic S203 controls the supply water temperature automatically according to
the heating demand and time programs.
Continuous normal temp.
Continuous temp. drop
Forced normal heating. All time programs are by-passed.
Forced temperature drop. All time programs are by-passed.w
Manual
Control mode
Continuous normal temp.
Continuous temp. drop
Manual
H1 Control circuit
Heating curve
Setting values
Control mode Manual
Actuator manual position 42%
>
>
>
>
The controller runs the valve to manual position. The controller has the lat-
est manual position in the memory. You can change the actuator manual
position by changing the setting value.
In manual mode the valve’s position is changed with the setting value ”H1
(H2) Manual mode position.”
H1 Control circuit
Heating curve
Setting values
Control mode Automatic
Time programss
>
>
>
>

16
Weekly programmes have a general graph view as well as a edit
view showing the exact time when the new state will be executed.
In the graph view, exceptions to normal temperature of control are
shown as bars.
Graph view
Editing view
Time Mode
21:00 Temp.drop
06:00 Normal temp.
00:00 Add new
MT W TS
F S
Browsing a weekly schedule:
Turn the control knob to browse a weekly schedule. If you wish to see
the exact switch times or you wish to change, delete or add switch
times, press OK at any weekday.
Temp.drop Weekly schedule
Monday
Tuesday
Wednesda
Thursday
Friday
Saturday
Sunday
0 3 6 9 12 15 18 21 24
Weekly schedules, special days and exception schedules can be
added to heating regulation in the S203. You can lower tempera-
tures desired times by using these time programs.
3.5.1 Weekly schedule
H1 (H2) Control circuit→ Time programs → Weekly schedule
3.5 Time programs
H1 (H2) Control circuit→ Time programs
Editing view
Deleting a switch time:
1. Turn the control knob to move to the switch time you wish to de-
lete and press OK.
2. Press OK at temperature level and select ”Delete switch time”.
3. Press OK at the end of the row.
Tip: Use the pre increase function. With the pre increase function the controller automatically increases supply
water temperature at the end of the reduction phase. Normal temperature has already been reached when the
heating mode changes to normal heat.
Set switch time
Set state
(=desired
temp. level)
Select
day(s)
Accept
Adding a new switch time:
1. Press OK at the “Add new” row.
2. You can select the value you want to change using the control
knob. By pressing OK you can change the value. Press ESC to re-
turn without changing the value.
3. Set the switch time (set hours and minutes separately).
Press OK to accept.
4. Press OK and then turn the control knob to set the temperature
level. Press OK to accept.
5. Press OK at each weekday you wish to choose.
6. Press OK at the end of the row to accept the new time program.
Note! Remember also to define when the control returns to auto-
matic (=normal). Press Esc to exit.
Editing a weekly schedule:
1. Turn the control knob to move to the value you wish to change
and press OK.
2. Turn the control knob to change the time and temperature.
Press OK to accept.
3. Press the OK button to change the day of the week.
4. Press Esc to exit.
H1 Control circuit
Heating curve
Setting values
Control mode Automatic
Time programs
>
>
>
>
Time
21:00 Temp. drop
06:00 Delete switch time
00:00 Add new
M T W T F S S
OK
Time Mode
06:00 Normal temp.
17:00 Temp. drop
00:00 Add new
M T W T F S S
OK
In this example, you can see a weekly
temperature drop program. Temperature
drop is on from 10 pm to 6 am from Monday
to Friday.

17
H1 (H2) Control circuit→ Time programs → Exception schedule
3.5.2 Exception schedule
You can easily make changes that dier from normal routine use
by using the exception schedule. The date, time and mode to which
heating will be changed in the period in question are entered in
the exception schedule. To switch from an exception schedule to
weekly schedule mode, select automatic mode.
The picture shows an exception schedule.
Heat reduction is on from 31 March 2021,
11:30 to 14 April 2021, 16:00
Day: 31.03.2021
Time: 11:30
Mode: Temp. drop
Repeat: No
Accept: Ready
Day Time
31.03.2021 11:30 Temp. drop
14.04.2021 16:00 Automatic
Add new
Day Time
Add new >
Adding a new switch time:
1. Navigate to ”Exception schedule” and press OK. The display will
read ”Add new.” Press OK
2. Press OK and set the start date for the program, then the time
and mode. You can select from the following:
Deleting a switch time from an exception schedule:
1. Navigate to the row with the activation time you want to delete.
2. Select ”Delete switch time.”
3. Accept the deletion by pressing ”Ready.”
1
2
3
4
• one day schedule from the weekly schedule (Monday - Sun-
day)
• a special day from the special day program (SD1 - SD7)
• one of the following heating levels: ”temperature drop,” or
”normal”
• ”automatic.”
3. Select, if the exception schedule repeats or not. If you select
repeat, it can be repeated every month same time or every year
same time.
4. Accept the exception schedule you created by pressing ”Ready.”
H1 (H2) Control circuit→ Time programs → Special days
3.5.4 Temp. level according to time program
3.5.3 Special days
You can enter special day programs as exceptions to normal week-
ly schedule. You can designate a maximum of 7 special day po-
grams (SD). A special day program is typically created for each
holiday. When the special day program will be applied it is set in
the exception schedule.
Adding a new switch time:
1. Navigate to ”Special days” and press OK. Select an unused special
day and press OK.
2. Place the cursor on ”Add new” and press OK. Set the time for the
program (hours and minutes are set separately). Select the mode
to be switched to at the time specified. Accept the program by
pressing OK when the cursor is on OK.
3. Navigate to the ”Add new” row. Set the time when the mode will
change from temperature drop mode back to normal temperature.
Accept the program by pressing OK. You can set several dierent
periods of temperature drop for the same special day.
Deleting a switch time from special day program:
Controller shows, what is the current heat level according to the time program.
Editing view
Graph
Special days
Special days
0 3 6 9 12 15 18 21 24
0 3 6 9 12 15 18 21 24
SD1 >
SD2 >
SD3 >
SD1 >
SD2 >
SD3 > 1. Navigate to the row with the switch time you want to delete.
2. Select ”Delete switch time.”
3. Accept the deletion by pressing ”Ready.”
1
Time Mode
00:00 Add new
0 6 12 18 24
08:00 Temp. drop
0 6 12 18 24
0 6 12 18 24
2
OK
>
>
>
SD1
SD1
SD1
Time Mode
Time Mode
08:00 Temp. drop
22:00 Normal
00:00 Add new
NOTE! Remember to also set the end time
for the exception schedule! When you set
the date and time, the mode will change to
”Automatic”. In this case, the control re-
turns back to the weekly schedule. If you
selected that the start time ”Repeats
every month or every year”, you have to
do same selection to the end time.
3

18
The S203 keeps the temperature of domestic hot water at the des-
ignated value. Because of the danger of bacteria, it is recommend-
ed that the domestic hot water temperature is not permanently set
below +55 °C.
The upper part of the accumulator is heated by a compressor and,
if necessary also by an electric heater, so that hot domestic water
is obtained.
Main menu
H1 Control circuit
H2 Control circuit
DHW Control circuit
Alarms
>
>
>
>
DHW Info
Domestic hot water setting values
Supply water temperature
Circulation water temp.
HW tank bottom temperature 48.4
HW tank top temperature 51.3
----- ACTUATOR CONTROL ---------------------
Actuator control 75 %
58.0 °C>
54.6°C>
53.2°C>
4 Domestic hot water control
Info-menu shows the domestic hot water settings, the measure-
ments and actuator control related to the domestic hot water.
DHW Control circuit
Info
Setting values
Control mode Automatic
Trend display
>
>
>
>
Setting values
Info
Setting name Factory
setting Range Explanation
Domestic hot water setting value 58.0 °C 20...90 °C Domestic hot water temperature setting.
Anticipation control In use In use/
Not in use
Anticipation speeds up regulation when water consumption
changes by using measurement information from the circulation
water sensor.
DHW reduction/incr. Time program Not in
use
Not in
use/ In use
The amount of the temperature reduction of DHW in time pro-
grams.
DHW reduction amount 10.0 °C 0...30 °C The amount of the temperature reduction of DHW in time pro-
grams.
DHW increment amount 10.0 °C 0...30 °C The amount of the increment of DHW in time programs.

19
Control mode
Control mode Explanation
Control mode
Automatic
Manual
Manual mechanical
Automatic mode is normally used in regulating domestic hot water. Here
you can switch from automatic to manual mode and move the vent into the
desired position. You can use manual mode for example when a sensor mal-
functions.
Automatic S203 maintains the temperature of domestic hot water at the setting value
set by the user.
Manual The desired position of the valve is set with the setting value ”Actuator
Manual position.”
DHW Domestic hot water control
Info
Setting values
Control mode Manual
Actuator manual position 20 %
>
>
>
>
Manual mechanical Manual mechanical control option must be taken into use. (Connections and
configuration → DHW Actuator control → Manual mech. control ”Available”).
If you want the voltage controlled actuators to be controlled by manual me-
chanical control, DHW actuator power supply must come from strip connec-
tor 58. The controller switches o the power supply, when the control mode
is set manual mechanical control.
The valve position is set in the actuator when using mechanical manual
control
Trend display
Trend display
Supply water temperaure
Circulation water temp.
Actuator control
>
>
>
You can read the real-time trends of the temperatures of supply water and
circulation water. Also the real-time trend of actuator control in domestic
hot water circuit can be read. The sampling interval is 1 s.

20
Tip: Use the pre increase function. With the pre increase function the controller automatically increases supply
water temperature at the end of the reduction phase. Normal temperature has already been reached when the
heating mode changes to normal heat.
Weekly programmes have a standard graph view as well as a
change view showing the exact time when the new mode command
will be executed. In the graph view, exceptions to normal tempera-
ture reductions are shown as bars.
Graph view
MT W TS
F S
Browsing a weekly program:
Turn the control knob to browse a weekly program. If you wish to see
the exact switch times or you wish to change, delete or add switch
times, press OK at any weekday.
Weekly schedule
DHW Domestic hot water control → Time programs → DHW recuction/incr. Weekly schedule
4.1 Time programs
DHW Control circuit→ Time programs
Adding a new switch time:
1. Press OK at the “Add new” row.
2. Set the switch time (set hours and minutes separately).
Press OK to accept.
3. Press OK and then turn the control knob to set the temperature
level (Drop ON/ Increase ON/ normal). Press OK to accept.
4. Press OK at each weekday you wish to choose.
5. Press OK at the end of the row to accept the new time program.
Note! Also remember to define when the control returns to auto-
matic (=normal). Press Esc to exit.
Note! Remember also to make the end section to the controls, i.e.
set the time of the return to the ”Normal” time, i.e. to the normal
domestic hot water control. Press ESC to exit the programming
mode.
You can change the supply water temperature with time program.
You can define in Supply water settings how much the time pro-
gram deflects the temperature from the normal supply water set-
ting.
Editing view
Time Mode
18:00 Increase ON
21:00 Normal
00:00 Add new
DHW reduction/Incr. Weekly schedule
Thursday
Friday
Saturday
Sunday
0 3 6 9 12 15 18 21 24
In the example the domestic hot water increase is
on from Monday to Thursday 18.00-21.00 and at
the weekend from Friday 18:00 to Sunday 21:00.
DHW Control circuit
Info
Setting values
Control mode Automatic
Trend display
Time programs
>
>
>
>
>
Monday
Tuesday
Wednesday