OUMAN A203 User manual

Controller for three circuits
- control for 2 heating circuits
- 1 domestic hot water control
USER MANUALUSER MANUAL
A203
XM1578: Version 1.0->
Saving energy, creating comfort

2
Turn the control knob
to navigate in the
menu.
Press the control knob-
to enter the menu and
accept the changes.
Control knob and OK
Cancel button
By pressing the ESC button, the
controller returns to the previous
menu and if you edit settings you
can cancel the setpoint change.
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
rst 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 user manual can also be downloaded from www.ouman. /en/document-bank/.
The A203 is a heating controller for 3 circuits (two heating circuits and one hot water circuit). Wiring
and congurating selections dene what is seen on the display screen.
You can move from one info view to
another by pressing the key.
Language/ Kieli
Palauta varmuuskopio
Kytkennät ja käyttöönotto
Ota valinnat käyttöön
suomi/Finnish >
>
>
>
Press OK. Select language and press OK.
The device restart.
More information see page 27
More information see page 47
More information see page 37
More information see page 47
Aloituskysely
Start up wizard
Language English/English >
Restore backup >
Connections and conguration >
Take selections into use >
Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Domestic hot water control
Main menu
>
>
>
>
DHW Info
Domestic hot water setting value 58.0
Supply water temperature 57.2
Circulation water temp. 56.3
----------ACTUATOR CONTROL---------------------
H2 Info
-----SUPPLY WATER---------------------------------
According to curve 47.3
Effect of parallel shift 0.0
Effect of time program 0.0
H1 Info
-----SUPPLY WATER-----------------------------------
According to curve 45.2
Effect of parallel shift 0.0
Effect of time program 0.0
OK
OK

3
1 Display menus 4
1.1 Basic view 4
1.2 Alarm notice 5
1.3 Menu structure 6
2 Inputs and outputs 7
3 Regulation of supply water in heating circuits 9
3.1 Info 9
3.2 Heating curve 11
3.3 Setting values 13
3.4 Control mode 14
3.5 Time programs 15
3.5.1 Weekly schedule 15
3.5.2 Exception schedule 16
3.5.3 Special days 16
3.5.4 Temp. level according to time program 16
4 Domestic hot water control 17
4.1 Time programs 19
5 Relay 5 and relay 6 control 21
6 Trends 23
7 Alarms 24
8 System settings 27
8.1 Setting date, time and language 27
8.2 Text message (SMS) settings 28
8.3 Network settings 29
8.4 Display settings 32
8.5 Type information 32
8.6 Lock code 32
9. Connection guide 33
9.1 Connections and conguration 37
10 Service settings 41
11 Restore settings and updates 47
11.1 Update the software 48
12 Remote control options 48
12.1 Text message use 48
12.2 WEB user interface 49
Optional accessories 50
Index 51
Tecnical information 52
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 22.02.2022 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 A203
clear and easy to use. The basic view shows the most impor-
tant information for monitoring operation of the unit. Favour-
ite views that can be changed by users 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
Temperature measurements
enable quickly determining
proper operation of the circuit.
Circuit control. This shows
whether the circuit’s heating
level has been continuously
forced to a particularly level
or if the controller is in man-
ual mode.
1.1 Basic view
Calibration
Calibration
Calibration
-12.4°C
45.2°C
32.8°C
58.0°C
09:00 22.02.2022
Outdoor temp.
H1 Supply water
H2 Supply water
DHW Supply water
Selection >
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. The calibration run can be disa-
bled if desired (see page 41).

5
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 22.02.2022 Selection > 2• A blinking exclamation point means the unit has active
alarms.
• The number indicates the number of active alarms.
Alarm indication
        
In the event of an alarm, an alarm window pops up showing de-
tailed alarm information and a beeping alarm signal goes on, if the

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 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.
1.2 Alarm notice

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.
The symbol indicates that all alarms are disabled.
H1 suuply water deviation alarm
PR 1 GROUP 1 A203.G101.0,TE41.DA1
H1 Supply water temp. =10.2 °C
Received: 08.02.2022 02:27
Press OK to acknowledge the alarm

6
Main menu 
In the user manual
Page 9
Page 9

Page 24

Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Domestic hot water control
Relay 5 control
Relay 6 control
Trends
Alarms
System settings
Service
>
>
>
>
IInputs and outputs
Home/Away mode Home >
----------------------------------------------------
Outdoor temp. -18.2 °C
H1 Supply water 35.1 °C
H1 Return water temperature 22.0 °C
H1 Room temperature 21.5 °C
H2 Supply water 36.5 °C
...
H1 Control circuit
H2 Control circuit
Info
Heating curve
Setting values
Control mode
Time programs
Info
Heating curve
Setting values
Control mode
Time programs
>
>
>
Automatic >
>
>
>
>
Automatic >
>
DHW Domestic hot water control
Info
Setting values
Control mode Automatic
Trend display
Time programs
>
>
>
>
>
Alarms
Active alarms
Acknowldge all alarms
Alarm history
Reset alarm history
Alarm receivers
Routing schedule
Alarm signal
>
>
>
>
>
>
On>
System settings
Time 17:01
Date 22.02.2022
Daylight saving In use
Language English/ English
SMS settings
Network settings
Display settings
Type info
Lock code
>
>
>
>
>
>
>
>
Not in use >
1.3 Menu structure
Page 21
Page 21
Page 23
Relay 5 control
Relay 6 control
Function Heating thermostat (R5)
Setting value
Outdoor temp.
R5 Control (81, 82)
Function Deft. therm.&time ctrl (R6)
Temperature limit 1
Temperature limit 2
Time program
Outdoor temp.
R6 control (83, 84)
21.0 °C >
11.0 °C
Off >
5.0 °C >
-5.0 °C >
>
11.0 °C
Off >
Trends
Outdoor temp.
----------------------------------------------------
H1 Supply water
H1 Return water
...
>
>
>
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


2 Inputs and outputs
You can see the inputs and outputs of A203 which are cong-
ured in use. Conguration of the inputs and outputs is done in
service menu (see p. 37-40). General measurements are temper-
ature measurements witch can be used for serial dierent pur-
poses. 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 cir-
cuit shorted). If a measurement is in manual mode, a hand im-
age is shown in the beginning of the line.
Inputs and outputs
Inputs and outputs are shown by the regulator in circuit-spe-

Informational general measurements, which can be used for
several purposes. Measurements can be named in the service

1
1
2
2
2
2
Main menu
Inputs and outputs
H1 Control circuit
H2 Control circuit
DHW Control circuit
>
>
>
>
Inputs and outputs
------ INPUTS AND OUTPUTS -----------------------
Outdoor temp. -18.2 °C
H1 Supply water 35.1 °C
H1 Return water temperature 22.0 °C
H1 Room temperature 21.5 °C
H2 Supply water 28.1 °C
H2 Return water temperature 21.1 °C
...
>
>
>
>
>
>
>
>
Measurement Range Measurement information
Home/Away mode Home/Away Home-Away mode. By pressing OK you can change the status of the
Home/Away mode. The mode can also be changed by Home/Away-
switch or by text message “Home” or “Away” when a GSM-modem (op-
tional) is available.
--------INPUTS---------------
Outdoor temp. -50...+130 °C Measured current outdoor temperature.
H1 /H2 Supply water -50...+130 °C Current temperature of the water entering the heating network.
H1 /H2 Return water tem-
perature -50...+130 °C Current temperature of the water returning form the heating network.
H1 /H2 Room temperature -50...+130 °C Current room temperature.
DHW Supply water -50...+130 °C Current domestic hot water temperature.
DHW Circulation water
temp. -50...+130 °C When there is no consumption, the measurement shows the tempera-
ture of DHW return water. During consumption, the measurement will
show the mixed temperature of cold water and return water, in which
case the measurement is used in so-called anticipation to improve the
regulation result.
H1/H2 DH Return -50...+130 °C Temperature of return water after the district heat exchanger or other
freely named temperature measurement.
DH Supply water temp. -50...+130 °C Temperature of water coming from the district heating plant.
DH Return water temp. -50...+130 °C Temperature of water returning to the district heating plant.
M10 (M11) Switch alarm
mode
 Information of the alarm contact.
General compensation 0...100% General compensation input value.
Measurement M11 (M12,
M13) -50...+130 °C 
Pressure switch mode  When the pressure of the network lowers below the pressure alarm
level, the state of the switch is changed to on and an alarm is activated.
Pressure measurement 0.... 16 bar Pressure of the heating network.
P2.1 (P2.2, P3.1, P3.2) Pump stop/run Status of the pump. (Run information is displayed if M15, M16, DI1 or
DI2 is selected as “Pump Indication”).
DI 1 (DI 2) Water volume The measured amount of water consumption (cumulative value).
DI 1 (DI2) Energy measure-
ment The measured amount of energy consumption (cumulative value).
Moisture sensor wet/dry Shows the state (wet/dry) of the moisture sensor.

8
Seis/Käy
If a GSM modem is connected to the controller, you can read
measurement 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 ,see more information p. 48)
Send a message: Inputs
The controller sends the current measurement information to
your mobile phone.
Same way send a message: Outputs
You can also change Home/Away mode.
Send a message: Home. The controller sends a response mes-
sage, which shows, that Home/Away -control is on Home-mode.
Similarly you can send a message: Away.
Key word:
Home:
Home-Away-control = Home/
INPUTS
OUTPUTS
HOME
AWAY
Outputs:
H1 = Actuator control = 25 % /
H2 Actuator control = 26 % /
DHW Actuator control = 52 %/
P2.1 Pump control = On
Inputs:
Outdoor temp. -18.2 °C /
H1 Supply water 35.1 °C/ H1
Return water 22.0 °C /
H1 Room temperature 21.5 °C /
Measurement Range Measurement information
----OUTPUTS-----
Actuator control 0....100 % Current actuator 1 control
Actuator control 2 0....100 % 
open the valve and the controller will then start up actuator 2.
P2.1 (2.2, P3.1, P3.2)
Pump control
 Pump control status. The information is displayed if the pump control
is selected and measurement selection in measurement channel M15,
M16, DI1 or DI2 is “Pump alarm” or “Not in use”. Information is not dis-
played if measurement selection is “Pump indication” (=run informa-
tion).
R5 control (81,82)  Relay control mode at the moment. By pressing the OK key, the control
mode can be changed to automatic / manual. If the control is manual,
an image of the palm will appear at the beginning of the line.
R6 control (83,84)  Relay control mode at the moment. By pressing the OK key, the control
mode can be changed to automatic / manual. If the control is manual,
an image of the palm will appear at the beginning of the line.
Solenoid valve control  When the moisture sensor detects the moisture, the valve is driven to
closed position (On). If you know the service code and want to control
the valve manually, press OK, enter a service code, select “Manual” and


9
The A203 enables control of two dierent supply water circuits
independently (H1 and H2).
Regulation of the temperature of supply water is controlled by
the outside temperature. Use of room temperature measure-
ments 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 wa-
ter temperature according to the outdoor temperature (accord-
ing to the heating curve).
If a room sensor is connected to the controller, you can check
which factors currently determine the room temperature set-
ting value at the time of inspection.
In addition the info menu contains the measurement tempera-
ture 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
--- SUPPLY WATER ---
According to curve Supply water temperature setting according to the curve at the current out-
door temperature.
Eect of parallel shift 
Eect of time program 
water. Near the end of the temperature reduction time, the pre-increase op-
eration can increase the temperature of supply water.
Force control eect Supply water has been forced permanently to the desired temperature re-
duction 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 mes-
sage (see 42).
Outdoor temp. delay eect -
ture.
Floor heat. anticipate 
Eect of autumn drying 
Return water compensation Increase in supply water temperature due to return water compensation.
Heat exhanger DH Return comp. ef-
fect Supply water increase caused by temperature compensation for return wa-
ter from district heating exchanger.
Eect of room compensation 
Room comp. time adjustment Additional correction for more precise room compensation based on real-

General compensation eect General compensation can be based for example on wind, solar or pressure
measurements.
Bus compensation eect The amount of required compensation is determined by an external device
to the A203, 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 informa-
tion says ”Controller is stopped for summer.”
Controller is in manual control Control circuit mode is set to ” Manual control”.

10
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
-
ter control.
-
ing 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

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 
Calculated room temperature Current room temperature setting determined by the controller.
----- MEASUREMENTS -------------------
Supply water temperature Current measured supply water temperature.
Outdoor temp. Themeasured outdoor temperature. Outdoortemperature dataisdisplayedifthe
delayed outdoor temperatureisnotusedinsupplywatercontrol.
Delayed outdoor temperature If the heating mode is set to radiator heating, the delayed temperature
measurement 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 delayed measurement as an outdoor temperature.
Anticipated outdoor temperature 
measurement can be used in supply water control. Typically 2 hours antici-
pation time is used (time can be set in service menu). In supply water con-
trol the controller takes into account the outdoor temperature change rate.
Room temperature The measured room temperature or room temperature from the bus. The
measurement is not necessarily taken into use in all control processes.
Delayed room temperature 
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) 
the valve and the controller will then start up actuator 2.
Actuators control 50%means thatthevalve1istotallyopenandthevalve2istotallyclosed. 100%
means that both valves are open.
----- PUMPS-------------------
P2.1 (3.1) Pump The state of the pump.
P2.2 (3.2) Pump The state of the reserve pump/alternative pump.
P2.1 (3.1) Pump control Control of the pump.
P2.2 (3.2) Pump control Control of the reserve pump/alternative pump.
P2.1 (3.1) Run time Running time for pump from the counter.
P2.2 (3.2) Run time Running time for reserve/ alternative pump from the counter.
Pump in progress Indicates which of the pumps is running in P2.1 or P2.2 (H1)/ P3.1 or P3.2 (H2
circuit).