Tech Controllers EU-28 SIGMA User manual

EU-28 SIGMA

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EU DECLARATION OF CONFORMITY
Hereby, we declare under our sole responsibility that EU-28 SIGMA manufactured by
TECH STEROWNIKI, head-quartered in Wieprz Biała Droga 31, 34-122 Wieprz, is compliant with
Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on
the harmonisation of the laws of Member States relating to the making available on the
market of electrical equipment designed for use within certain voltage limits (EU OJ L 96, of
29.03.2014, p. 357), Directive 2014/30/EU of the European Parliament and of the Council of
26 February 2014 on the harmonisation of the laws of Member States relating to
electromagnetic compatibility (EU OJ L 96 of 29.03.2014, p.79), Directive 2009/125/EC
establishing a framework for the setting of ecodesign requirements for energy-related products
as well as the regulation by the MINISTRY OF ENTREPRENEURSHIP AND TECHNOLOGY of 24
June 2019 amending the regulation concerning the essential requirements as regards the
restriction of the use of certain hazardous substances in electrical and electronic equipment,
implementing provisions of Directive (EU) 2017/2102 of the European Parliament and of the
Council of 15 November 2017 amending Directive 2011/65/EU on the restriction of the use of
certain hazardous substances in electrical and electronic equipment (OJ L 305, 21.11.2017, p.
8).
For compliance assessment, harmonized standards were used:
PN-EN IEC 60730-2-9:2019-06, PN-EN 60730-1:2016-10.
Wieprz, 29.03.2022

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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.
WARNING
•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 shoud measure earthing resistance of the electric motors as
well as the insulation resistance of the cables.
•The regulator should not be operated by children.
WARNING
•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.
•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.
Changes in the merchandise described in the manual may have been introduced subsequent to
its completion on 29.03.2022 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.
We are committed to protecting the environment. Manufacturing
electronic devices imposes an obligation of providing for environmentally
safe disposal of used electronic components and devices. Hence, we
have been entered into a register kept by the Inspection For
Environmental Protection. The crossed-out bin symbol on a product
means that the product may not be disposed of to household waste
containers. Recycling of wastes helps to protect the environment. The
user is obliged to transfer their used equipment to a collection point
where all electric and electronic components will be recycled.

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I. Description
EU–28 SIGMA regulator is intended for CH boilers. It controls the CH pump, domestic hot water
pump (DHW) and the blow (fan).
The left part of the display shows the temperature of the boiler. In the middle the user may see
the flue gas temperature. The right part shows the fan power. Press EXIT in order to return to
the main menu.
The controller is equipped with a range of safeguards to ensure failure-free boiler
operation:
SIGMA – this function controls the fan operation in the CH boiler operation mode. For example,
when the set temperature is 60°C, the CH boiler temperature is 45°C and it is increasing, the
fan slows down every 1°C. After the set temperature has been reached, the fan stops and
operates according to the preset operation and pause cycle of the blow-by (in sustain mode).
Anti-stop – the controller has an anti-stop function which prevents too long periods of the
pump operation standstill. Outside the heating season the pumps are switched on once every
10 days.
Anti-freeze – this function activates all the pumps if the temperature of the circulating water
drops below the set value (6°C), in order to prevent the water in the installation from freezing.
I.a) Basic terms
Fire-up – The cycle begins when you activate the fire up function in the controller menu and
it remains active until the CH boiler temperature reaches 40oC (the default fire-up threshold),
on condition that the temperature does not drop below this value for 2 minutes (the default
fire-up time). If these conditions are met, the regulator switches to the operation mode
and the manual operation symbol on the casing will go off. If the controller fails to reach the
parameters required for entering the operation mode within 30 minutes from activation of the
Exit,
cancelling
settings
Entering menu and
approving settings
Button
PLUS
Fan
CH pump
DHW pump
Manual
operation
Power
switch
Button
MINUS

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fire-up function, the following message appears on the display: ”Fire-up failed”. In such a
case, the fire-up cycle needs to be restarted.
Operation – After the fire-up cycle is completed, the regulator enters the operation mode. It
is the primary mode of the controller operation in which the fan works automatically, oscillating
around the temperature set by the user. Instead of the fire-up function, the user's menu
presents fan option. The fan may be disabled if needed (e.g. when adding fuel). If the
temperature rises unexpectedly by more than 5oC above the set value, the so-called supervision
mode is activated.
Damping – if the CH boiler temperature drops 2oC below the damping threshold and does not
rise above this value within 60 minutes (preset damping time), the regulator enters damping
mode. After this time the fan is disabled and the display shows the following message:
“Damping”
In the case of voltage failure, the thermoregulator stops working. After the power supply has
been reestablished, the operation mode is restored according to the previously set parameters
(owing to the built-in memory). The thermoregulator parameters remain stored even on voltage
failure.
II. Functions of the regulator
This section includes the description of the regulator functions, and provides information on
how to adjust the settings and navigate in the menu structure.
II. a) Main page
During standard regulator operation, the LCD display shows the main page with the following
information:
CH boiler temperature (to the left)
Set temperature (to the right)
The set temperature may be easily adjusted using PLUS and MINUS buttons. By
pressing OPTIONS button, the user enters the first level menu. The display shows the first two
lines of the menu. Each menu may be navigated using PLUS and MINUS buttons. Pressing
OPTIONS button moves the user to a further submenu or activates the selected option. EXIT
button moves the user back to the main menu.
II. b) Fire-up
This function enables easy fire-up of the CH boiler. After the fire is initiated by the user, an
automatic fire-up cycle is activated. Next, the CH boiler smoothly enters the operation mode,
owing to optimal parameters. If the CH boiler reaches the temperature of the damping
threshold, the Fan ON/OFF function appears instead of the fire-up function. It enables the user
to switch off the fan at any time (e.g. when adding fuel)
If the CH boiler fails to reach the temperature of 40OC (preset damping threshold) within
30 minutes when in the fire-up mode, the display shows the following alarm message:
23 Oc | 55 Oc
Ch set

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In order to restore the CH boiler operation, the controller should be set to 0 position and then
again to 1 position. After the controller logs in, the fire-up function should be activated again
and the controller will renew the fire-up process.
II. c) Manual operation
For the user's comfort, the regulator offers Manual mode function. In this mode, each element
of the system – the fan, the CH pump, the DHW pump and the alarm – may be switched on
and off independently of the others. Additionally, Blow force function has been added in this
mode.
This function enables the user to adjust the fan power in Manual mode
•Pressing OPTIONS button enables the fan. The fan remains active until
OPTIONS button is pressed again.
•Pressing MENU button enables / disables the fan
•Pressing MENU button enables / disables the CH pump
•Pressing MENU button enables / disables the DHW pump (of the water boiler)
Pressing MENU button enables / disables the alarm.
II. d) Sigma
II.l.7 Degrees before the set temperature
In this function the user may choose when the fan should start slowing down. (from 1OC to
20OC before the set temperature is reached).
II.l.8 The fan minimum
This function allows the user to set the lowest speed of the fan ( from 1% to 100%) which it
will slow down to after the set temperature has been reached.
II.l.9 The fan maximum
This function allows the user to set the highest speed of the fan ( from 1% to 100%) which will
be reached when SIGMA function is activated.
II. e) Operation in sustain mode
The function is used to set the operation time of the fan in the sustain mode.
II. f) Pause in sustain mode
This function is used to set the pause time of the blow in the sustain mode.
The last two functions are used to regulate the CH boiler operation in the sustain mode.
It prevents the CH boiler from damping when its temperature remains above the set value.
ATTENTION: Incorrect setting of these functions may lead to constant increase in temperature!
The user should especially ensure that the pause time in the sustain mode is not too short and
38 Oc | 55 Oc
Unable to fire up
20%
Blow force
23 Oc | 55 Oc
Ch set
Blow force
fan

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the operation time in the sustain mode is not too long.
II. g) Blow-by power
This function is used to set the fan speed during the blow-by. The setting range is from 1% to
100% (it may be regarded as fan gears). The higher the gear is, the faster the fan works. 1%
gear is the minimum fan speed whereas 100% is the maximum fan speed.
II. h) CH boiler hysteresis
This option can be used to set the hysteresis of the set CH temperature. It is the
difference between the temperature of entering the sustain mode and the temperature
of restoring the operation mode (e.g. when value of the set temperature is 60ºC and
the hysteresis is 2ºC, entering the sustain mode will take place at 60ºC, whereas the
operation mode will be restored at 58ºC. The setting range for the hysteresis is from
1ºC to 20ºC.
II. i) DHW Hysteresis
This option can be used to set the hysteresis of the water boiler set temperature (DHW). It is
the difference between the set temperature (which is the preset water boiler temperature at
which the DHW pump is disabled) and the temperature at which the DHW pump operation is
restored. For example, if the DHW set temperature is 55°C, and the hysteresis is 5°C, after the
set temperature (55°C) is reached, the DHW pump will switch off. The DHW pump operation
will be restored when the temperature drops to 50°C.
II. j) CH pump activation
This option is used to set the temperature of CH pump activation (the temperature is measured
at the CH boiler). When the temperature (e.g. 40°C) is exceeded, the pump is activated and
works according to the selected mode of operation. The pump is disabled when the CH boiler
temperature drops below the activation temperature minus 3°C. In the example given, the
pump switches off at the temperature of 37°C.
II. k) DHW pump activation
This option is used to set the temperature of DHW pump activation (the temperature is
measured at the CH boiler). When the temperature (e.g. 40°C) is exceeded, the pump is
activated and works according to the selected mode of operation. The pump is disabled when
the CH boiler temperature drops below the activation temperature minus 3°C. In the example
given, the pump switches off at the temperature of 37°C.
II. l) Operation modes
This function allows the user to choose on of the following modes of CH boiler operation:
II.l.1 House heating
If this option is selected, the regulator switches to the house heating mode. The CH pump
is activated when the pump activation temperature is exceeded. Below this temperature (minus
fixed hysteresis value of 2OC), the pump is disabled.
II.l.2 DHW priority
In this mode, the DHW pump is activated and works until the set temperature is reached. Then,
it is disabled and the CH circulation pump is activated (the pumps work alternately). CH pump
operates until the water boiler temperature drops below the set value minus hysteresis. Then,
the CH pump is disabled, and the DHW pump is activated. In this mode, the fan operation is

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limited to the temperature of 62OC on the CH boiler in order to prevent the CH boiler
overheating.
The CH pump operates until the water boiler temperature drops below the set value (3OC).
Then, the CH pump is disabled and the DHW pump is activated.
DHW priority function involves heating domestic water prior to heating the water in radiators.
CAUTION: Return valves should be installed on the circuits of the CH and DHW pumps. The
valve on DHW pump prevents hot water from being sucked out of the water boiler. The valve
on the CH pump circuit prevents the hot water heating the boiler to pass to the house heating
installation.
II.l.3 Parallel pumps
In this mode, operation of the pumps begins simultaneously above the set temperature of pump
activation (see: Pump activation temperature). The CH pump works continuously whereas the
DHW pump is disabled when the set temperature of the water boiler is reached. The DHW pump
operation is restored when the set temperature drops by the value of DHW hysteresis.
II.l.4 Summer mode
After this function is activated, only DHW pump remains active and its task is to heat the water
boiler. The pump is activated above the switch-on threshold (see: pump activation temperature)
and works until the set temperature is reached. The pump operation is restored when the
temperature drops below the set value minus hysteresis. In summer mode, the user chooses
only the set temperature of the CH boiler which heats the water in the water boiler (the set
temperature of the CH boiler is also the set temperature of the water boiler).
II.m) Room temperature regulator
The room regulator is connected to the controller using the twisted-pair cable (the input
labelled: ROOM REGULATOR) After the regulator has been properly connected to the controller,
it should be activated in the controller menu.
The room regulator operates by opening the contact of the wires when the set room
temperature has been reached. When the need for reheating the room is signalised to the CH
boiler controller, it automatically enters the sustain mode, regardless of the CH boiler set
temperature.
Attention: If the set temperature of the controller installed on the CH boiler is too low, the
regulator may not reach the set room temperature.
After the Room regulator option is activated in the controller menu, the upper part of the
main screen shows the letter <p>. If the letter is flashing, the room is insufficiently heated (the
set room temperature has not been reached). If <p> is not flashing, the set room temperature
has been reached (the room is sufficiently heated)
CAUTION: No external voltage may be connected to the room regulator input
II. n) Language
This option enables the user to choose the language version of the controller.
II. o) Factory settings
The regulator is pre-configured for operation. However, the settings should be customized to
53 Oc 55 Oc
Ch set
Operation mode
Room regulator
Switch on *
off

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the user's needs. Return to factory settings is possible at any time. When the factory settings
option is activated, all customized settings of the controller are lost and replaced with the
manufacturer's settings. Then, the boiler parameters may be customized anew.
III. Safeguards
In order to ensure safe and failure-free operation, the regulator has been equipped with a range
of safeguards. In the case of alarm, a sound signal is activated and the display shows an a
suitable message. To restore the controller operation, press MENU button. In the case of the
following alarm : “CH temperature too high”, the user must wait for a while until the
temperature drops below the alarm value.
III. a) Thermal protection
The controller is equipped with a bimetallic mini-sensor (placed next to CH boiler sensor or on
the supply pipe), which automatically disconnects the fan from the power supply when the
alarm temperature of about 85°C is exceeded. It prevents the water in the installation form
boiling in the case of boiler overheating or controller damage. This type of thermal protection
restores the initial automatic mode. In the case when this sensor is damaged, the fan does not
operate either in manual mode or in automatic mode.
III. b) Automatic sensor check
If there is no CH temperature sensor or if it is broken, an alarm is activated and the display
shows the information about the fault, for example:
The fan is disabled. CH pump and DHW pump are enabled regardless of the current
temperature. button should be pressed (it applies to DHW sensor – then the alarm is
deactivated and single-pump operation mode is restored) If the CH sensor is damaged, the
alarm is active until a new sensor is installed.
III. c) Temperature protection
The regulator is equipped with additional protection is case of bimetallic sensor
damage. After the temperature of 85OC is exceeded, an alarm is activated and the following
message is shown on the display:
Current temperature is read from the electronic sensor and it is processed by the regulator. In
the case when the alarm temperature is exceeded, the fan is disconnected and both pumps
work simultaneously in order to spread hot water through the installation.
III. d) CH water anti-boil protection
This protection applies only to the boiler priority mode, when the water boiler temperature is
too low. Then the water boiler temperature is set at 55OC, and the CH boiler temperature
increases to 62OC (so-called priority temperature), the controller switches off the fan. If the
CH boiler temperature increases to 80OC, the CH pump is enabled. If the temperature is still
increasing, an alarm is activated when the value of 85OC is reached. It may happen if the water
boiler is damaged, the sensor is installed incorrectly or the pump is damaged. When the
alarm
temp too high
alarm
sensor damage

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temperature starts decreasing, at the threshold of 60OC the controller activates the fan and
remains in operation mode until the temperature of 62OC is reached.
III. e) Fuse
The regulator is equipped with two 3,15A fuses as a network protection.
Caution: A higher amperage fuse should not be used as it may damage the controller.
IV. Maintenance
Before and during the heating season, the EU-28 SIGMA controller should be checked for
condition of its cables. You should also check if the controller is properly mounted and clean it
if dusty or dirty. Moreover, the earthing parameters of the motors ( of the CH pump, DHW
pump and the fan) should be measured.
Power supply
230V ±10% /50Hz
Maximum power consumption
3,5W
Ambient temperature
5÷50
Pump max. output load
0,5A
Fan max. output load
0,6A
Temperature measurement accuracy
1°C
Sensor thermal resistance
-30÷99°C
Fuse
2x 3,15A
V. Installation
Caution: The device should be installed by a qualified person. During installation the device
mustn't be powered! (make sure the plug is disconnected from the power supply!)
Caution: Incorrect connection of the wires may damage the regulator!

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V. a) Controller wiring diagram
Particular attention should be paid when connecting the controller cables to the correct
connection of the earthing wires.

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