Tech Controllers EU-i-3 Plus OT User manual

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EU-i-3 Plus OT

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TABLE OF CONTENTS
I. Safety.......................................................................................................................................................................... 5
II. Device description...................................................................................................................................................... 6
III. How to install ............................................................................................................................................................. 8
IV. Main screen description........................................................................................................................................... 11
1. Installation screen ..................................................................................................................................................11
2. Parameter and panel screen ..................................................................................................................................11
V. Quick setup of the controller ................................................................................................................................... 12
Part I. How to configure built-in valves, additional valves and room regulators
I. How to configure built-in valve................................................................................................................................ 13
II. Weather-based control ............................................................................................................................................ 17
III. Mixing valve settings ...............................................................................................................................................18
IV. Quick setup of the mixing valve ...............................................................................................................................21
V. Additional valves ...................................................................................................................................................... 22
Part II. Controller operation modes
I. Water tank priority...................................................................................................................................................23
II. Parallel pumps.......................................................................................................................................................... 23
III. House heating ..........................................................................................................................................................23
IV. Summer mode.......................................................................................................................................................... 23
V. Automatic summer mode ........................................................................................................................................ 24
Part III. DHW pump and Anti-legionella
I. How to configure DHW pump operation .................................................................................................................24
II. Anti-legionella .......................................................................................................................................................... 25
III. Pump ANTI-STOP...................................................................................................................................................... 26
Part IV. Manual mode
I. Manual mode ........................................................................................................................................................... 27
Part V. Additional contacts
I. Voltage contacts and voltage-free contacts............................................................................................................. 28
II. How to configure a contact...................................................................................................................................... 29
III. Voltage and voltage-free contact algorithms...........................................................................................................30
1. Circulating pump .................................................................................................................................................... 30
2. Buffer pump ........................................................................................................................................................... 30
3. CH pump................................................................................................................................................................. 31
4. Additional heat source ...........................................................................................................................................32
5. Buffer......................................................................................................................................................................33
6. DHW buffer ............................................................................................................................................................ 33

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7. Heating need .......................................................................................................................................................... 34
8. Operation control................................................................................................................................................... 35
9. DHW ....................................................................................................................................................................... 36
10. Controlling the room regulator..........................................................................................................................36
11. Relays................................................................................................................................................................. 37
12. Weekly control................................................................................................................................................... 37
13. Manual mode.....................................................................................................................................................39
14. OFF..................................................................................................................................................................... 39
IV. 0-10V contacts..........................................................................................................................................................39
1. Activity.................................................................................................................................................................... 39
2. Select operation algorithm..................................................................................................................................... 39
2.1. Heating need ................................................................................................................................................. 39
2.2. Manual mode................................................................................................................................................. 41
3. Status during alarm ................................................................................................................................................ 41
Part VI. Cascade
I. Cascade .................................................................................................................................................................... 41
1. Select operation algorithm..................................................................................................................................... 41
2. Operation mode ..................................................................................................................................................... 42
3. Additional contacts................................................................................................................................................. 42
4. Select sensor .......................................................................................................................................................... 43
5. Voltage ................................................................................................................................................................... 43
6. Main boiler ............................................................................................................................................................. 43
7. Reset motohours....................................................................................................................................................43
8. Factory settings ......................................................................................................................................................43
Part VII. Ethernet module
I. Ethernet module ......................................................................................................................................................44
Part VIII. Solar collector
I. Solar collector........................................................................................................................................................... 45
1. Solar collector.........................................................................................................................................................45
2. Accumulation tank ................................................................................................................................................. 46
3. Pump settings.........................................................................................................................................................47
4. Additional contact .................................................................................................................................................. 48
5. Additional contact 2 ............................................................................................................................................... 48
Part IX. Gas boiler (Open Therm)
I. Gas boiler (Open Therm).......................................................................................................................................... 48
1. Heating need .......................................................................................................................................................... 48

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2. Manual mode .........................................................................................................................................................48
3. OFF ......................................................................................................................................................................... 48
4. DHW ....................................................................................................................................................................... 48
5. Alarm message ....................................................................................................................................................... 49
Part X. Cooling
1. Cooling.................................................................................................................................................................... 50
2. Condition of activation...........................................................................................................................................51
3. Additional contact ..................................................................................................................................................51
4. Heating circuit ........................................................................................................................................................ 51
Part XI. Sensor settings
I. Sensor settings .........................................................................................................................................................52
Part XII. Factory settings
I. Factory settings ........................................................................................................................................................52
Part XIII. Settings
I. Settings.....................................................................................................................................................................53
1. Language selection................................................................................................................................................. 53
2. Time settings .......................................................................................................................................................... 53
3. Screen settings ....................................................................................................................................................... 53
4. Alarm sounds.......................................................................................................................................................... 53
5. Notifications ........................................................................................................................................................... 53
6. Lock ........................................................................................................................................................................ 53
7. Software version .................................................................................................................................................... 54
Part XIV. Weekly control
I. Weekly control ......................................................................................................................................................... 54
Technical data...................................................................................................................................................................... 56
Protections and alarms........................................................................................................................................................ 57
Software update..................................................................................................................................................................58
Used sensors........................................................................................................................................................................ 58

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I. SAFETY
Before using the device for the first time the user should read the following regulations carefully. Not obeying the rules
included in this manual may lead to personal injuries or controller damage. The user’s manual should be stored in a safe
place for further reference. In order to avoid accidents and errors it should be ensured that every person using the device
has familiarized themselves with the principle of operation as well as security functions of the controller. If the device is
to be sold or put in a different place, make sure that the user’s manual is there with the device so that any potential user
has access to essential information about the device.
The manufacturer does not accept responsibility for any injuries or damage resulting from negligence; therefore, users
are obliged to take the necessary safety measures listed in this manual to protect their lives and property.
Changes in the merchandise described in the manual may have been introduced subsequent to its completion on 20th
July, 2022. The manufacturer retains the right to introduce changes to the structure. The illustrations may include
additional equipment. Print technology may result in differences in colours shown.
Care for the natural environment is our priority. Being aware of the fact that we manufacture
electronic devices obligates us to dispose of used elements and electronic equipment in a
manner which is safe for nature. As a result, the company has received a registry number
assigned by the Main Inspector of Environmental Protection. The symbol of a crossed out
rubbish bin on a product means that the product must not be thrown out to ordinary waste
bins. By segregating waste intended for recycling, we help protect the natural environment.
It is the user's responsibility to transfer waste electrical and electronic equipment to the
selected collection point for recycling of waste generated from electronic and electrical
equipment.
WARNING
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High voltage! Make sure the regulator is disconnected from the mains before performing any activities
involving the power supply (plugging cables, installing the device etc.).
•The device should be installed by a qualified electrician.
•
Before starting the controller, the user should measure earthing resistance of the electric motors as well as
the insulation resistance of the cables.
•The regulator should not be operated by children.
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The device may be damaged if struck by a lightning. Make sure the plug is disconnected from the power
supply during storm.
•Any use other than specified by the manufacturer is forbidden.
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Before and during the heating season, the controller should be checked for condition of its cables. The user
should also check if the controller is properly mounted and clean it if dusty or dirty.

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II. DEVICE DESCRIPTION
EU-i-3 Plus OT controller is a multi-function device intended for controlling central heating systems.
The principle of operation involves mixing the hot supply water with the water returning from the heating circuit in order
to reach the desired temperature and maintain it on the same level all the time.
The pump connected to every valve circuit helps to distribute water through the heating system. The pump should be
installed downstream of the mixing valve and the temperature sensor should be installed downstream of both the pump
and the valve to ensure precise water control at the valve output.
Thanks to advanced software, the controller offers a wide range of functions:
•Smooth control of three mixing valves
•Control of DHW pump
•Protection against too high temperature of CH boiler water as well as too low temperature of water returning to
CH boiler
•Weather-based control
•Weekly control
•Two configurable no-voltage outputs
•Two configurable voltage outputs
•Supporting three room regulators with traditional communication (two-state)
•Possibility of connecting 3 dedicated room regulators with RS communication
•Supporting a room regulator with RS communication
•Possibility of connecting ST-505 Ethernet module, ST-525 or WiFi RS which enable the user to control certain
functions and view some of the parameters via the Internet
•Possibility of connecting two additional modules controlling the valves (e.g. i-1, i-1m) –it enables the user to
control two additional valves
•Possibility of controlling solar panels
•Two 0-10V configurable outputs
•Possibility of controlling CH boiler cascade
•PWM output for controlling a solar collector pump
•Open Therm communication (OT) with a gas boiler

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1. WiFi RS
2. ST-505 Internet module
3. ST-525 Internet module
4. ST-294v1 Room regulator
5. ST-280 Room regulator
6. ST-292 Room regulator
7. Dedicated room regulator RI-1
8. Dedicated room regulator RI-2
9. i-1m valve module
10. i-1 valve module
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III. HOW TO INSTALL
EU-i-3 Plus OT controller should be installed by a qualified person. It may be installed as a free-standing device or as a
panel mountable on a wall.
Remove the controller cover to connect the wires.
Bolts fastening the
controller cover
WARNING
Risk of fatal electric shock from touching live connections. Before working on the controller switch off the power supply
and prevent it from being accidentally switched on.

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RS Input
Left terminal strip
Right terminal strip
Earth bar
USB
Additional connector
0-10V contacts
Open Therm

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Connectors, symbols and example use

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IV. MAIN SCREEN DESCRIPTION
The device is controlled using the touch screen.
1. INSTALLATION SCREEN
1. Pre-set room temperature
2. Current room temperature
3. Day of the week and time
4. Wi-Fi signal strength
5. Notification icon
6. Enter controller menu
7. External temperature
8. Current operation mode
9. Solar collector temperature
10. Pre-set and current DHW temperature
11. Accumulation tank temperature
12. Level of valve opening [%]
13. Scroll arrow
14. Return temperature
15. Active additional contact ( N1, N2 - voltage
contacts; B1, B2 - voltage-free contacts)
16. Temperature reading from CH sensor
17. Pre-set and current temperature of the
heating circuit
18. Circuit switched off
19. Active cooling mode in a given circuit
2. PARAMETER AND PANEL SCREEN
•Parameter screen –a record including the status of all active inputs and outputs
•Panel screen –parameters of particular active circuits and algorithms. Tap on a panel to start editing
its parameters.
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V. QUICK SETUP OF THE CONTROLLER

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PART I
How to configure built-in valves, additional valves and room regulators
I. HOW TO CONFIGURE BUILT-IN VALVE
Fitter’s menu
Number of valves
Valve 1
Additional contacts
TECH RS regulator
Cascade
Ethernet module
Solar collector
Cooling
Sensor settings
Factory settings
Menu
Valve menu
Only pump*
Type of valve
Opening time
CH sensor
Pump activation
Room regulator
Weather-based control
Mixing valve settings
Floor circuit settings**
Factory settings

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* select in case of circuit operation without a mixing valve
** this option appears when the floor valve type has been selected
1. Enter the fitter’s menu
2. Select the number of valves needed
3. Configure one of then selecting ‘Valve 1’ option
4. Select the type of valve: CH valve, Floor valve, Return protection, Swimming pool, Ventilation. The
principle of operation in the case of Swimming pool and Ventilation valves is the same as in the case of CH
valve. What changes is the graphics on the installation screen.
•CO –select if you want to control the temperature of the CH circuit with the use of a valve sensor. The
valve sensor should be installed downstream of the mixing valve in the supply pipe.
•FLOOR –select if you want to control the temperature of the underfloor heating circuit. It protects the
underfloor heating system against dangerous temperature. If the user selects CH as the valve type and
connects it to the underfloor heating system, the fragile floor installation may be damaged.
•RETURN PROTECTION –select if you want to control the return temperature of the heating system with
the use of a return sensor. With this type of valve, only the return sensor and the CH boiler sensor are
active; the valve sensor is not connected to the controller. In this configuration, the valve protects the
CH boiler return against low temperature, and if the CH boiler protection function is selected, it also
protects the CH boiler against overheating. If the valve is closed (0% opening), the water flows only
through the short circuit, while full valve opening (100%) means that the short circuit is closed and water
flows through the entire heating system.
WARNING
If the selected valve type is different from the valve used in the system, it may lead to the whole heating system damage.
Floor circuit settings
Floor heating - summer Max, floor temperature
Decide if the valve should work in
summer mode.
The temperature above which the valve
will close and the circulating pump will be
disabled.
NOTE
The controller may support 3 built-in valves and two additional valves.
WARNING
If CH boiler protection is disabled, the CH temperature does not influence the valve opening. In extreme
cases, CH boiler overheating is possible; therefore, it is recommended to configure CH boiler protection
settings.
Floor type

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5. Set the opening time
Opening time is the parameter defining the time needed for the valve actuator to open
the valve from 0% to 100%. CH opening time should be the same as the value given on
the rating plate of the valve actuator.
6. Select CH sensor
The selected sensor will serve as CH sensor. The reading from the selected sensor determines the valve pump
activation when the function of pump activation above threshold is active.
Connecting CH sensor
7. Enable the pump
Operation modes:
•Always OFF - the pump is disabled permanently and the device controls only the valve.
•Always ON - the pump operates all the time regardless of the temperature of the heat source and the
valve.
•ON above threshold - the pump is enabled above the pre-set activation temperature. The setting range:
10°C - 55 °C.
•Closing below temperature threshold - the valve will close when the temperature drops below the
value defined in the parameter ON above threshold. As a result, the circuit valve will be disabled.
8. Select one of the regulators in ‘Room regulator’ (optional). Once the option has been selected, define the
type of regulator : standard regulator, TECH RS regulator).
Actuator
opening time
NOTE
If the CH sensor has not been
connected and ‘Boiler protection’
function is enabled, the controller will
inform the user about the lack of
sensor through an alarm.
EU-i-3 Plus OT

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•Standard regulator –a two-state regulator operating on an open/closed basis. It offers the following functions:
closing, room regulator temperature lower, pump deactivation.
•Tech regulator Algorithm ( Tech RS regulator ) - controlling the pre-set valve temperature on the basis of two
parameters: ‘Room temperature difference’ and ‘Change of pre-set valve temperature’. The pre-set valve
temperature is raised or lowered depending on the room temperature. Additionally, it is possible to activate the
room regulator functions: Pump deactivation and Closing.
Example:
Room temperature difference 1°C Change of pre-set valve temperature 2°C
When the room temperature increases by 1°C, the valve pre-set temperature changes by 2°C.
•Standard regulator (Tech RS regulator) – a type of RS regulator operating on the basis of the parameters defined
in the room regulator functions: closing, room regulator temperature lower and pump deactivation.
•Select dedicated regulator (Tech RS regulator) - Pre-set valve temperature control is performed via room
regulators dedicated to the EU-i-3 Plus OT controller. The user may register up to 4 dedicated regulators: the ST-
280 regulator or Dedicated regulators 1-3.
•How to register dedicated regulators:
In order to register a dedicated regulator, go to the Menu→Fitter’s menu→Valve (1,2 or 3)→Room reg.→Tech
RS reg.→Select dedicated reg. →Dedicated reg. (1,2 or 3). Tap on ‘Dedicated regulator’ (1,2 or 3) to start the
registration process of the dedicated regulator. Confirm registration by selecting OK. Next, start the registration
process in the regulator. After successful registration, go back to ‘Tech RS regulator’ in order to select the
Room temperature
difference
Room temperature
difference
Select dedicated
regulator
Standard regulator
Tech regulator
Algorithm
Standard regulator
1-3
Room controller
function
Tech RS regulator
Standard regulatorOFF
Room regulator
ST-280 regulator Dedicated regulator
1-3

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regulator function: ‘Standard regulator’ or ‘Tech regulator Algorithm’ (this step is necessary to ensure proper
operation of the regulator). Follow the same steps while registering another regulator.
•Room regulator functions:
1. Closing - when the room regulator reports that the room temperature is too low, the valve starts closing (to
reach the minimum valve opening).
2 Room regulator temperature lower - when the regulator reports that the pre-set room temperature has been
reached, the pre-set valve temperature will change by the value of ‘Room reg. temp. lower’ parameter (pre-set
temperature - pre-set reduction temperature).
3. Pump deactivation - when the room regulator reports that the pre-set room temperature has been reached,
the circuit pump will be disabled.
Example connection of a two-state regulator
II. WEATHER-BASED CONTROL
For the function of weather control to be active, the external sensor mustn't be exposed to sunlight or influenced by the
weather conditions. After it has been installed in an appropriate place, <weather control> function needs to be activated
in the controller menu.
For the valve to operate correctly, the user defines the pre-set
temperature (downstream of the valve) for 4 intermediate
external temperatures: -20ºC, -10ºC, 0ºC and 10ºC.
In order to configure the pre-set temperature value, touch and
drag appropriate points up or down (the pre-set valve
temperature will be displayed on the left), or use arrows to select
the temperature value. Subsequently, the display will show the
heating curve.
NOTE
It is possible to register up to 3 dedicated regulators to the controller. A dedicated regulator does not
cooperate with additional modules I-1 ( it only supports built-in valves).
EU-i-3 Plus OT

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Connecting the external sensor
III. MIXING VALVE SETTINGS
•Temperature control - This parameter determines the frequency of water temperature measurement (control)
behind the CH valve. If the sensor indicates a change in temperature (deviation from the pre-set value), then the
valve actuator will open or close by the set stroke, in order to return to the pre-set temperature.
•Opening direction - If, after connecting the valve to the controller, it turns out that it is connected the other way
round, then the power supply cables do not have to be switched. Instead, it is enough to change the opening
direction in this parameter: LEFT or RIGHT. This function is available only for built-in valves.
•Minimum opening - The parameter determines the smallest valve opening. Thanks to this parameter, the valve
may be opened minimally, to maintain the smallest flow. If you set it at 0°, the valve pump will be disabled.
NOTE
This function requires the use of external
sensor.
NOTE
Once this option has been activated, it is possible to change the pre-
set valve temperature only by selecting the range on the heating
curve.
NOTE
Further settings of the external sensor are available in Sensor settings.
NOTE
When return protection valve type has been selected, the weather-based control function does not work.
The cooling mode has its own heating curve for the weather-based control function: Cooling →Heating
circuit →Circuit 1-3 →Heating curve.
EU-i-3 Plus OT

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•Hysteresis –the hysteresis between the pre-set temperature and current valve temperature.
•Single stroke - This is a maximum single stroke (opening or closing) that the valve may make during one
temperature sampling. If the temperature is near the pre-set value, the stroke is calculated on the basis of
<proportionality coefficient> parameter value. The smaller the single stroke, the more precisely the set
temperature can be achieved. However, it takes longer for the set temperature to be reached.
•Proportionality coefficient - Proportionality coefficient is used for defining valve stroke. The closer to the pre-
set temperature, the smaller the stroke. If the coefficient value is high, the valve takes less time to open but at
the same time the opening degree is less accurate. The following formula is used to calculate the percent of a
single opening:
(PRE-SET_TEMP - SENSOR_TEMP) * (PROP_COEFF /10)
•Sensor calibration - this function enables the user to calibrate the built-in valve at any time. During this process
the valve is restored to its safe position –in the case of CH valve it is fully opened whereas in the case of floor
valve it is closed.
•Opening in CH calibration –this function enables the user to change the direction of valve opening/closing
during calibration.
•Weekly control - this function is described in section XIV.
•Valve deactivation - once this has been selected, valve operation depends on weekly control settings and
external temperature.
✓Weekly control - once this function has been selected, the user may activate/deactivate weekly
operation schedule and define the time when the valve will be closed.
✓External temperature - the user may set nighttime and daytime temperature at which the valve will be
deactivated. It is also possible to program hours when the controller will operate in day or night mode.
The user sets the hysteresis of valve deactivation temperature.
•Protections
✓Return protection - this function is used to set CH boiler protection against too cool water returning
from the main circuit, which could cause low-temperature boiler corrosion. The return protection
involves closing the valve when the temperature is too low, until the short circulation of the boiler
reaches appropriate temperature. The user may set the temperature threshold below which the return
protection will be activated.
NOTE
To ensure the effectiveness of this protection, it is necessary to activate the valve in the heating circuit menu
and connect the return sensor.
NOTE
The function of Valve deactivation based on outside temperature does not work in cooling mode. The
Return protection type does not offer Valve deactivation function.

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✓CH boiler protection - this function serves to prevent hazardous growth of CH boiler temperature. The
user sets the maximum acceptable CH boiler temperature. In case of hazardous growth in the
temperature, the valve begins to open in order to cool the CH boiler down. This function is disabled by
default.
NOTE
This option is unavailable for floor valves.
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