Tech Controllers EU-48 User manual

EU-48

EU DECLARATION OF CONFORMITY
Hereby, we declare under our sole responsibility that EU-48 manufactured by TECH
STEROWNIKI, head-quartered in Wieprz Biała Droga 31, 34-122 Wieprz, is compliant with Di-
rective 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 electromag-
netic 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 haz-
ardous 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, 21.02.2022

1SAFETY
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 activi-
ties 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.
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
21.02.2022. 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 im-
poses an obligation of providing for environmentally safe disposal of used electronic com-
ponents 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 col-
lection point where all electric and electronic components will be recycled.

2DESCRIPTION
The EU–48 temperature regulator is designed for central heating boilers. It controls the water
circulation pump ., the hot utility water (C.W.U.) pump, the floor heating pump, the circulation pump,
the blow (fan) and the fuel feeder. Two modules controlling three-way or four-way valves can be added
to the EU–48 thermoregulator (this is an additional option).
The advantage of this controller is its simplicity in operation. The user makes all changes of pa-
rameters with the knob of the pulse generator. Another advantage is a large and clear graphic display,
where the user can exactly see the current condition of the boiler's operation.
Any comments concerning the program should be reported to the boiler's manufacturer.
Each controller should be set individually for own needs, depending on the type of fuel used for
burning as well as the type of the boiler. The TECH company does not bear any responsibility for improper
controller settings.
3FUNCTIONS OF THE REGULATOR
This chapter describes the functions of the regulator, the method of changing the settings and
navigating the menu which takes place by means of the pulse generator (knob). The boiler's opera-
tional parameters are displayed on the main screen of the controller. The user selects the operation mode
and a number of settings of the boiler according to their own needs.
The boiler manufacturer's name as well as the program version appear on the graphic display
after activation of the controller. After a few seconds a message with language selection appears. In this
function, the user can change the language version.
Standby mode
Pulser knob
Exit
Active room thermostat
Clock
Pump operation
mode
Current flue gas
temperature
Fan (%),
pumps: CH,
HW, circulating
(or valve), valve
calibration

3.1 BASIC DEFINITIONS
Operation –after activation of the controller, it switches to the operation cycle and the following mes-
sage is shown on the display: "OPERATION". This is the basic functioning condition of the regulator, in
which the blow power and the working time and the pause time of the fuel feeder takes place in
accordance with the user's settings. If the temperature of the boiler increases above the set value, the
so-called support mode is activated.
Support mode –this mode will activate automatically, if the temperature is equal or higher than the
set temperature. The following message will appear on the display: "SUPPORT". In such a case, the
circulating water regulator should feed the fuel more slowly, so as to smoothly reduce the water temper-
ature. To reduce the temperature correctly, the pause time and the working time in the support mode
should be configured.
3.2 HOMEPAGE
During normal operation of the regulator, the Main page is visible on the graphic display. De-
pending on the operation mode, the relevant main screen is displayed.
Pressing the knob of the pulse generator brings the user to the first level menu. The first three
menu options are shown on the display. Go to subsequent options by rotating the knob. The knob should
be pressed to select a given function. A similar procedure is followed when changing parameters. In order
to enter changes, it is necessary to approve them by pressing the pulse generator when the CONFIRM
message is displayed. If the user does not want to make any changes in a given function, they
should press the pulse generator when the CANCEL message is displayed. To exit the menu or cancel
introduction of a change, select the <<exit << option in the menu or press the exit button on the
controller.
Pressing the knob of the pulse generator brings the user to the first level menu. The first three
menu options are shown on the display. Turn the knob to move to subsequent options. Press the knob
to select a given function. Similar actions are made when changing parameters. To introduce changes it
is necessary to approve them by pressing the pulse generator when the APPROVE message is shown.
If the user does not want to make any changes in a given function, they should press the pulse generator
when the CANCEL message is shown. To exit the menu select the exit option.
3.3 MANUAL OPERATION
For the user's convenience, the regulator has been equipped with a Manual operation module.
In this function, each executive device (feeder, blow-in, CH pump, hot utility water pump, circulation
pump, floor pump) is switched and deactivated independently of the others.
Pressing the pulse generator activates the engine of the chosen device. This device remains
activated until the pulse generator is pressed again.

Additionally, the blow force option, in which the user has the possibility to set any rotational speed
of the fan in manual operation is available.
3.4 OPERATION OF THE ADDITIONAL FURNACE
Tetmo-Tech boilers are equipped with two furnaces:
➔retort furnace which is fed in sequences with the fuel from the container using a worm feeder,
➔additional (grate) furnace which is used to support combustion in the event of a long-term pause
in supply of electric power and periodical incineration of wood.
If the operation of the additional furnace function is switched off, the boiler operates on the basic
grillage with automatic feeding of fuel. In the case of activation of this function, the feeder is disconnected
and fuel feeding is carried out manually, just like in the case of backfill boilers.
NOTE
If this function is activated, the options in the menu marked with (*) are not present.
3.5 FEEDING TIME*
This option is used to set the operation time of the fuel feeder. The operation time should be set
depending on the used fuel and the type of the boiler.
3.6 FEEDING PAUSE*
The pause time is used to set the feeder's operation pause. The pause should be adjusted to the
type of fuel combusted in the boiler. Incorrect selection of the operation time and the pause time may
result in flawed functioning of the boiler, i.e.. the fuel cannot be reheated or the boiler cannot achieve
the set temperature. Selection of proper times allows correct operation of the boiler.
3.7 BLOW FORCE
This function controls the rotational speed of the fan. The adjustment range is between 1 and
100%, (it can be assumed that they are the gears of the fan). The higher the gear the faster the fan is
operating, where 1% is the minimum speed of the fan and 100% is the maximum speed at which the
fan can operate.
3.8 OPERATION MODES
In this function, the user selects one of four boiler operation options.
3.8.1 House heating
When this option is selected, the regulator switches to heating the house only. The central heating
pump starts to work above the pump activation threshold (preset at 40 O C). Below this temperature,
the pump stops working.
3.8.2 Reboiler priority
In this mode the reboiler pump (C.W.U.) is turned on first, until the set temperature is reached. After
reaching the set temperature of the reboiler, the central heating pump shuts down and causes activation

of the CH pump. Operation of the CH pump proceeds all the time, until the moment when the temperature
it falls below the set value in the reboiler. Then the CH pump shuts down and the hot utility water pump
is activated.
In this mode, operation of the fan and the feeder is limited to the temperature of 62 degrees in the boiler
because this prevents the boiler from overheating.
Note: The boiler should have return valves mounted on the circuits of CH and HUW pumps. The valve
mounted on the HUW pump prevents hot water from being pulled out from the reboiler.
3.8.3 Parallel pumps
In this mode, both pumps work simultaneously above the pump activation threshold temperature
(preset at 40OC).
The CH pump works continuously and the HUW pump shuts down after reaching the temperature set at
the reboiler. Re-activation of the HUW pump will take place after the reboiler temperature drops below
the set value (see HUW hysteresis in the installer menu).
NOTE: In this mode, one should install a three-way valve or another mixing valve causing maintenance
of a different temperature of in reboiler and of a different in the house.
3.8.4 Summer mode
After activation of this function, only the HUW pump, whose tasks is to additionally heat the reboiler,
operates. This pump is activated above the set activation threshold (see the pump activation temperature
function) and operates until the set temperature is reached. The pump will activate again when the
temperature falls below the set value and set hysteresis. In the summer mode only the set temperature
is set at the boiler which additionally heats the water in the reboiler (the set temperature of the boiler is
at the same time the set temperature of the reboiler).
3.9 SET CH TEMPERATURE
This option is used to set the set temperature of the boiler. The user may change the temperature range
at the boiler from 45 C to 80 C. The set CH can also be changed directly from the main controller screen
by rotating the knob of the pulse generator.
3.10 SET HUW TEMPERATURE
This option is used to set the set hot utility water temperature. The user may change this tem-
perature in the range from 40OC to 75OC.
3.11 WORK IN SUPPORT*
This option is used to set the operation time of the feeder and the blow in the support mode
(above the set temperature).
3.12 SUPPORT PAUSE*
This option is used to set the time of pause in operation of the feeder during support.
Note: Incorrect setting of this option may result in constant temperature increase! The pause in sup-
port should not be too short.

3.13 FAN IN SUPPORT
In this function, the user seths the operation time and the pause time of the fan at work in the support
cycle.
3.14 FACTORY SETTINGS
The regulator is pre-configured for operation. However, it should be adjusted to own needs. Return
to the factory settings is possible at any moment. By activating the factory settings option, the user loses
all own boiler settings for the settings saved by the manufacturer of the boiler. From that moment, the
own boiler parameters can be set again.
3.15 SCREEN VIEW
In this function, the user can select one of the three thermoregulator's main operation screens.
They are:
➢CH screen (the current operation mode of the boiler is displayed),
➢valve 1 (displays operation parameters of the first valve),
➢valve 2 (displays operation parameters of the second valve).
NOTE
To make the views with the valve parameters active, the valves must be earlier accordingly installed and
configured by the installer.
3.16 INSTALLER MENU
The functions in the installer menu should be set by the person installing the boiler or by the
manufacturer's service.
3.16.1 Valve 1
NOTE
Controlling the valve is possible after purchasing of an additional ST-61 control module, which is not
attached to the controller in the standard option, and connecting it to the controller. To control two
valves, two ST-61 modules should be connected
In order to ensure that the valve works correctly and in accordance with the user's expectations,
it should be first registered by entering the module number (this is the valve number according to
the documentation) and then several parameters should be set.
3.16.2 1. Temperature control
This parameter determines the sampling (control) frequency of the water temperature behind the
valve for the CH or the HUW installation. If the sensor indicates a change in temperature (deviation from
the set value), then the electric valve will open or close itself by the set stroke to return to the set
temperature.

3.16.3 2. Opening time
In this function, the valve opening time is set, in other words, how long takes it the valve to open
to the value of 100%. This time should be selected according to the owned valve servomotor (specified
on the rating plate).
3.16.4 3. Unit stroke
In this function, the unit percentage valve opening stroke is set, that is which minimum opening
or closing percent is expected to be made by the valve.
3.16.5 4. Minimum opening
In this function, the minimum valve opening value is set. Below this value, the valve will not close
any further.
3.16.6 5. Valve type
Using this option, the user selects the type of the valve: CH or floor.
3.16.7 Valve 2
If the user wants to control two valves, like in the previous case, valve 2 should be registered and
all settings accordingly configured in the same manner as in the case of valve 1.
3.16.8 Pump activation temperature
This option is used to set the threshold activation temperature of CH and HUW pumps (this is the tem-
perature measured in the boiler). Above the set temperature, the pumps operate according to the se-
lected operation mode. Deactivation of the pumps will happen after a drop of temperature in the boiler
below the activation temperature (minus hysteresis e.g. 2 ˚C).
3.16.9 Temperature alarm
The time after elapse which the temperature alarm will be activated is set using this function. If
the boiler temperature does not increase by the set time to the set temperature, the alarm will be acti-
vated. After pressing the knob of the pulse generator, the alarm is turned off and the regulator returns
to the recently set operation mode
3.16.10 Room regulator
After connection EU-48 controller to the room controller, its type should be marked:
➢standard (two-state regulator),
After additional heating of the room to the set temperature, the room regulator opens the contact
and the boiler controller switches into the support phase (regardless of whether the set temperature has
been reached).
➢TECH regulator (extended device allowing to control several parameters simultaneously).
When using this type of regulator, the user has a possibility to change the set temperature of the
boiler, the reboiler and the mixing valves.
After activation of the Room regulator option, the letter "P" will appear on the main screen of
the controller at the top part of the display. A blinking letter "P" , indicates that the rooms are under-
heated; when the set temperature in the flat is reached, "P" will glow constantly.
Note: No external power source should be connected to the output of the room regulator.

3.16.11 Boiler hysteresis
This option is used to set the hysteresis of the set temperature. This is a difference between the
temperature of entering the support cycle and the temperature of return to the operation cycle (for
example: when the set temperature has the value of 60ºC, and the hysteresis is 3ºC, switching into the
support cycle will proceed when the temperature increases to 60ºC, while return to the operation cycle
will proceed when the temperature decreases to 57ºC).
3.16.12 HUW hysteresis
This option is used to set the hysteresis of the set temperature in the reboiler. It is the maximum differ-
ence between the set temperature (that is required in the reboiler) and the current temperature in the
reboiler at which the HUW pump will activate. (for example: when the set temperature has the value of
55oC and the hysteresis is 5oC. After reaching the set temperature, that is 55oC, the HUW shuts down
and causes activation of the CH pump. Re-activation of the HUW pump will proceed when the tempera-
ture decreases to 50oC).
3.16.13 Floor pump
This function is used to control floor heating. The user sets the floor heating temperature in the range of
30oC –55oC. After activation of the floor pump should be set, the minimum (threshold) pump activation
temperature (measured in the boiler) and the maximum (set) floor heating temperature (measured on
the pump sensor).
The floor pump does not operate below the minimum temperature. Above this temperature, the pump is
activated until the maximum set temperature is reached.
After reaching the set temperature, the pump shuts down. Re-activation of the floor pump will proceed
when the temperature decreases by 2OC below the set value.
3.16.14 Circulation pump
This function is used to control the hot water mixing pump between the boiler and the hot utility water
receivers. After activation of this function, the user sets the pump's daily activation or standstill cycle
with the accuracy to 30 minutes.
3.16.15 Timer
By setting the timer, the user defines the current hour and the day of the week.
3.16.16 Language selection
Using this function, the user selects the language in which the controller will be operated.
3.16.17 About the program
After activation of this option, the display will show the boiler manufacturer's logo along with the
regulator's software version.
3.16.18 Language selection
Using this function, the user selects the language in which the controller will be operated.
3.16.19 Pulse generator sensitivity
Using this setting, one can change the sensitivity of the knob of the pulse generator in the range
from 1 to 3 (where 1 is the highest sensitivity). Servicing menu

To access the servicing functions of the controller, enter a four-digit code. Such code is in pos-
session of the manufacturer of the boiler as well as the TECH company.
4PROTECTIONS
To ensure maximally safe and unfailing operation, the regulator has a number of protections. In
the case of an alarm, a sound signal is activated and an appropriate message is shown on the display.
To make the controller return to operation, press the pulse generator.
4.1 TEMPERATURE ALARM
This protection is activated only in the operation mode (that is when the boiler temperature is
lower than the set temperature). If the boiler temperature does not increase throughout the period set
by the user, the alarm is activated, the feeder and the blow-in are deactivated (the water pump is turned
on regardless of the boiler temperature) and a sound signal is activated. An appropriate message will be
shown on the display.
The alarm will be disabled after pressing the knob of the pulse generator. The regulator returns
to the recently set operation mode.
4.2 THERMAL PROTECTION
It is an additional bimetallic mini-sensor (located at the boiler temperature sensor), disconnecting
the fan and the feeder in the event of exceeding the alarm temperature: 85OC. Its activation prevents
the water in the installation from boiling , in the event when the boiler overheats or the controller is
damaged. After activation of this protection, when the temperature goes down to a safe value, the sensor
will unlock automatically and the alarm will be deactivated. In the case of damage or overheating of this
sensor, the fan the and feeder will be disconnected.
4.3 AUTOMATIC SENSOR CONTROL
In the event of damage of each of the sensors the sound alarm is activated, additionally signalling
, the defect on the relevant display, e.g.: "CH sensor damaged". The feeder and the blow-in is disabled.
The pumps operate according to the set temperatures, regardless of alarms.
In the case of damage of the CH sensor or the feeder, the alarm will be active until the sensor is replaced
with a new one. If the HUW sensor is damaged, one should press the menu button, which will turn off
the alarm and the controller will return to the one pump (CH) operation mode. In order to ensure
that the boiler will be able to work in all modes, the sensor must be replaced with a new one.
4.4 PROTECTION AGAINST BOILING OF WATER IN THE BOILER
This protection is applies only to reboiler priority operation mode. When the set reboiler tem-
perature is e.g. . 55OC and the actual temperature in the boiler increases up to 62OC (this is the so-
called the priority temperature), then the controller will turn off and the feeder the fan. If the temperature
in the boiler still increases up to 80OC, the CH pump will be activated. When the temperature still
increases, then the alarm will be activate at the temperature of 85OC. Most often such a condition may
appear when the reboiler is damaged, the sensor is improperly fitted or the pump is damaged. However,
when the temperature drops, then at the threshold of 60OC the controller will turn on the feeder and the
blow-in and will run in the operating mode until the temperature of 62OC is reached.
4.5 TEMPERATURE PROTECTION
The regulator has an additional protection in the event of damage of the bimetallic sensor. After
exceeding the temperature of 85ºC, the alarm is activated, signalling the following on the display: "Tem-
perature too high". Despite damage of the bimetallic sensor, the controller receives information on the
current temperature in the boiler from the electronic sensor. In the case of exceeding the alarm temper-
ature, the fan is turned off and, at the same time, both pumps begin to operate in order to distribute hot
water across the house installation.

4.6 FUEL CONTAINER PROTECTION
On the fuel feeder there is an additional temperature measuring sensor. In the event of its signif-
icant increase (above 70OC), the alarm is activated; the feeder is activated every 10 minutes, which
causes pushing the fuel to the combustion chamber. This way the feeder sensor protects against fuel
ignition in the container.
The regulator has a WT 6.3A tubular fuse insert, protecting the network. Using a fuse with a higher
value can cause damage to the existing controller
4.7 FUSE
The regulator has a WT 6.3A tubular fuse insert, protecting the network.
Using a fuse with a higher value can cause damage to the existing controller.
5MAINTENANCE
Technical condition of wires should be checked in the ST-48 controller before the heating season
starts and across its duration. One should also check fastening of the controller and clean it from dust
and other dirt. The earthing effectiveness of the engines ( of the CH pump, the HUW pump, the blow-in,
the feeder, the floor pump, the circulation pump)should also be measured.
TECHNICAL DATA
Power supply
230V ±10% /50Hz
Maximum power consumption
11W
Ambient working temperature
5÷50°C
Pump max. output load
0,5A
Valve max. output load
0,5A
Fan max. output load
0,6A
Temperature measurement accuracy
1°C
Sensor thermal resistance
-30÷99°C
Fuse
6,3A

Installation
NOTE: installation should be performed by a person with relevant licenses! At that time, the device must
not be at live voltage (it is necessary to ensure that the plug is disconnected from the electrical grid)!
NOTE:Incorrect connection of wires can cause damage to the regulator!
NOTE: the EU-48 controller must be used for installation of the boiler, so that there is no access to cable
installation slats.
The regulator cannot work in a closed central heating system. Safety valves, pressure valves and a
levelling tank protecting the boiler against boiling of water in the central heating system must be in-
stalled.
5.1 SCHEME OF CONNECTION OF CABLING TO THE CONTROLLER
Please pay special attention during installation of the controller cabling to correct connection of earthing
wires.
PE- EARTHING SYSTEM (YELLOW-GREEN)
N - NEUTRAL (BLUE)
L- PHASE (BROWN)
Figure 1: Scheme of connection of cabling to EU-48

1Safety 3
2Description 4
3Functions of the regulator 4
3.1Basic definitions 5
3.2Homepage 5
3.3Manual operation 5
3.4Operation of the additional furnace 6
3.5Feeding time* 6
3.6Feeding pause* 6
3.7Blow force 6
3.8Operation modes 6
3.8.1House heating 6
3.8.2Reboiler priority 6
3.8.3Parallel pumps 7
3.8.4Summer mode 7
3.9Set CH temperature 7
3.10Set HUW temperature 7
3.11Work in support* 7
3.12Support pause* 7
3.13Fan in support 8
3.14Factory settings 8
3.15Screen view 8
3.16Installer menu 8
3.16.1Valve 1 8
3.16.21. Temperature control 8
3.16.32. Opening time 9
3.16.43. Unit stroke 9
3.16.54. Minimum opening 9
3.16.65. Valve type 9
3.16.7Valve 2 9
3.16.8Pump activation temperature 9
3.16.9Temperature alarm 9
3.16.10Room regulator 9
3.16.11Boiler hysteresis 10
3.16.12HUW hysteresis 10
3.16.13Floor pump 10
3.16.14Circulation pump 10
3.16.15Timer 10
3.16.16Language selection 10

3.16.17About the program 10
3.16.18Language selection 10
3.16.19Pulse generator sensitivity 10
4Protections 11
4.1Temperature alarm 11
4.2Thermal protection 11
4.3Automatic sensor control 11
4.4Protection against boiling of water in the boiler 11
4.5Temperature protection 11
4.6Fuel container protection 12
4.7Fuse 12
5Maintenance 12
5.1Scheme of connection of cabling to the controller 13