Tech Controllers EU-880 zPlD User manual

EU-880 zPID

EU-880 zPID
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EU DECLARATION OF CONFORMITY
Hereby, we declare under our sole responsibility that EU-880 zPID 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, 06.07.2022

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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.
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.
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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II. Description
The EU-880zPID temperature controller is designed for use with central heating boilers. It controls the
following units: central heating (CH) water circuit pump, domestic hot water (DHW) pump, circulating or
valve pump, mixing valve and fan. Optionally, control functions can be also provided for two additional
mixing valves via ST-61 modules.
The ST-880zPID controller is a unit with a continuous output signal using a modified PID control
algorithm. In this type of controller the blowing power is calculated by measuring the boiler temperature
and the flue gas temperature as measured at the outlet of the boiler. The fan is run continuously and the
blowing power depends directly on the measured temperature of the boiler, the flue gas temperature and
the difference between these parameters and their set-points. The advantages of a modified PID
controller include the ability to maintain a stable set-point temperature without any unnecessary
overshoot or oscillations.
When using this type of controller equipped with a flue gas outlet sensor fuel savings can be
achieved from a few percent up to around 15 percent with the output water temperature kept at a very
stable label, resulting in longer life of the exchanger (boiler). As the flue gas temperature at the boiler
outlet is controlled this results in low emissions of dust and gases that are harmful to the environment.
The thermal energy of the flue gas is not wasted and released into the chimney, but is instead used for
heating.
Below we present the results of tests conducted with the use of the Tech controller with PID control:

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and the same controller without PID control:
II.a) Basic concepts
Lighting - cycle that lasts until the flue gas temperature reaches a specific value, provided that it does
not drop below this value for 4 minuts (factory setting for lighting time).
Operation – after the lighting procedure is completed the controller will go into operating cycle mode
and the display will show the message: ”PID:OPERATION”. This is the main operating status of the
controller in which the blower function is run automatically and fuel is supplied automatically based on
the PID algorithm oscillating around the user’s set-point temperature. If the temperature suddenly rises
by more than 5°C above its set-point value so-called monitoring mode is activated.
Monitoring mode - this mode will start automatically if during any time that the controller is in operating
cycle mode the temperature rises by more than 5°C above its set-point value. If this happens in order to
lower the circulating water temperature the controller will switch over from PID control to manual settings
(as per parameters set in the Installation menu>>Monitoring mode) and the display will show the
message: "PID:MONITORING".
Shutting off - if the flue gas temperature drops below a specified value and does not rise above this
value for 10 minuts (factory setting for shutting off time), the controller will go into shut off mode. In
this mode the blower and feeder will stop running and the display will show the message: "SHUT OFF".
If there is power failure the thermoregulator will stop working.
When power is restored the controller will resume operation at its pre-set parameters restored from its
built-in memory. No saved thermoregulator parameters are lost when there is power failure.

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III. Controller functions
This chapter describes the functions of the controller, how to change its settings and navigate its menus
III.a) Main page
During normal operation of the controller the graphic display shows the main page. Depending
on the operating mode its corresponding main screen is displayed (see Section II.C).
To move to the first level menu press the pulser knob. The display shows the first four menu
options. To access more options turn the knob. To select a function, press the knob. To change parameters
follow the same procedure. For your changes to be entered it is necessary to confirm them by pressing
the pulser at CONFIRM. If you do not want to make any changes within a given function press the pulser
at CANCEL. To exit the menu use the EXIT key.
If necessary, you can use the standby mode button located on the controller housing to rapidly
turn off all actuators. This is an additional safeguard feature for use in an emergency situation that allows
you to power down all controller actuators (fan, pump, valve).
NOTE: Power is not disconnected from the controller when it is in standby mode.
III.b) Lighting / Blowing
With this function you can easily light the boiler. After you light an initial area an automatic lighting
cycle will be activated. With the PID function ensuring the selection of optimal parameters the boiler will
smoothly enter its operating mode.
III.c) Screen view
You can use this function to select one of four thermoregulator
operation main screens:
•CH screen (displays the current
mode of operation of the boiler),
•main valve (displays the operating
parameters of the main valve),
•valve 1 (displays the operating pa-
rameters of additional valve 1)
•valve 2 (displays the operating pa-
rameters of additional valve 2)
•service screen –this view is not ac-
cessible to the user. It is a special screen view for use only by the
manufacturer.
The screen view can be also changed directly from the home page by
pressing EXIT.

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NOTE: To enable the views showing valve parameters the respective valves must be pre-installed and
configured properly by a installation fitter.
III.d) Set-point CH temperature
This option is used to adjust the
set-point temperature of the boiler. You
can change the boiler temperature within
an adjustable temperature range of 45OC
to 85OC. The central heating set-point can
be also changed directly from the
controller main screen by turning the
pulser knob.
III.e) Set-point DHW temperature
This function allows you to set your
required set-point temperature for
domestic hot water. You can adjust this
temperature within a range from 30OC to
60OC.
III.f) Type of fuel
This option is used choose one of three
types of fuel (coal, fines or wood) for
burning in the boiler. For each type of fuel
chosen a suitable operation mode for the
fan is selected to match the actual process
of combustion in the boiler.
III.g) Manual operation
For your convenience the controller
is equipped with a Manual operation
module. When this function is active each
actuator (blowing, central heating pump,
hot water pump, additional circulating or
valve pump) can be switched on or off
independently and each active mixing valve
can be closed, opened or stopped.
You can start the motor of your
selected device by pressing the pulser. The
device will remain activated until the
pulser is pressed again.

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Additionally, an option to control the blowing power is available
where you can set any fan speed in manual mode.
III.h) Pump operation modes
This function allows you to select one of the following four boiler operation
modes:
III.h.1) House heating
When you select this option the controller
switches over to a mode where heating is
provided only to heat the central heating
circuit. The central heating pump begins to
run above the pump activation temperature
(factory set at 38OC). The pump will turn off
below this temperature (minus a hysteresis
of 2°C).
III.h.2) Boiler tank priority
In this mode, the boiler tank (hot
water) pump will be switched on first to run
until the set-point temperature is reached,
after which the pump will be turned off and
the CH circulating pump will be enabled.
The central heating pump will run all the
time until the boiler tank temperature drops
below its set-point by the hot water hysteresis value. At that moment the CH pump will turn off and the
HW pump will turn on (both pumps operating alternately).
In this mode the fan and the feeder are run only up to 62OC as measured at the boiler (instantaneous
set-point) so as to prevent overheating of the boiler.
NOTE: The boiler must be fitted with check valves on the central heating and hot water pump circuits.
The valve mounted on the hot water pump is to prevent drawing hot water from the boiler tank.
III.h.3) Pumps in parallel
In this mode both pumps begin to run
together (in parallel) above the pump
activation temperature. However, these
temperatures may vary for each pump,
depending on your settings. When this is so
one of the pumps will switch on earlier than
the other one, but after both thresholds are
crossed both pumps will run together. The central heating pump will run all the time while the hot water
pump will turn off when the boiler tank set-point temperature is reached. It will turn on again when the
temperature drops by the preset HW hysteresis value below its set-point.

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III.h.4) Summer mode
Once this function is activated the central
heating pump will be off and the DHW pump
will turn on above the preset activation
temperature and will work continuously
until the temperature drops below the
activation temperature by the hot water
hysteresis value or until the following
conditions are met:
(boiler temperature) + 2°C ≤ (boiler tank temperature)
In summer mode you only enter the set-point temperature of the boiler, which is also understood to
mean the set-point temperature of the boiler tank.
III.i) Weekly control
The function is used to programme daily changes in the boiler temperature. The preset
temperature deviations are within the range of +/-100C.
Step #1:
The user needs to set current time and date first (Installer menu > Clock).
Step #2:
The user sets temperature values for individual days of the week (Set mode 1):
Monday– Sunday
Select specific hours and required deviations from the preset temperature (how many degrees the
temperature should rise or drop) for each day of the week. Additionally, the preset values can be copied
to facilitate the operation.
Example
Monday
preset: 3 00 , temp. -100C (temperature change– 100C)
preset: 4 00 , temp. -100C (temperature change – 100C)
preset: 5 00 , temp. -100C (temperature change – 100C)
In such a case, if the temperature preset on the boiler is 60ºC, it will drop 10ºC to 50ºC between
3 a.m. and 6 a.m. on Monday.
As an alternative to the temperatures being preset separately for individual days, the
temperatures can also be set collectively, in the second mode, for the working days (from Monday to
Friday) and the weekend (Saturday and Sunday) separately - Set mode 2.
Monday - Friday; Saturday - Sunday
Similarly to the previous mode it is necessary to select specific times and required deviations from the
temperature preset for the working days (Monday - Friday) and the weekend (Saturday, Sunday).
Example
Monday - Friday
preset: 3 00 , temp. -100C (temperature change – 100C)
preset: 4 00 , temp. -100C (temperature change – 100C)
preset: 5 00 , temp. -100C (temperature change – 100C)
Saturday - Sunday
preset: 16 00 , temp. 50C (temperature change +50C)
preset: 17 00 , temp. 50C (temperature change +50C)
preset: 18 00 , temp. 50C (temperature change +50C)

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In this case, if the preset boiler temperature is 60ºC, the temperature will drop 10ºC to 50ºC between 3
a.m. and 6 a.m. on each day from Monday to Friday. However, the temperature will rise 5ºC to 65ºC
during weekend (Saturday, Sunday) between 4 p.m. and 7 p.m.
Step #3:
The user enables one of two preset modes (Mode1, Mode2) or disables the weekly control option.
Once the mode is enabled the value of the deviation currently set is displayed on the main page of the
controller next to the preset central heating system temperature. This, additionally, indicates that the
weekly control is active.
Data deletion function is a simple method to remove all previously saved weekly programme
settings to enter new settings.
III.j) Room thermostat reduction
This feature works in
conjunction with a two-state room
thermostat (standard controller) or a TECH
controller. The room thermostat reduction
parameter specifies the temperature value
by which the CH set-point is to decrease
after the room thermostat is heated up
(when the set-point temperature in the house/flat is reached). The adjustment range for settings is
between 0 and 30°C.
III.k) Language selection
Use this function to change the language settings of the controller.
III.l) Factory settings
The controller is pre-configured for its
operation. However, its settings should be
modified to meet your individual needs.
You can return to the factory settings at
any time. If you enable the factory
settings option you will lose all of your
own boiler settings, which will replaced
with the settings saved by the boiler manufacturer. From now on you can re-set your own parameters of
the boiler.
III.m) About the program
You can use this function to check the software version installed in the
boiler controller.

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IV. Installation menu
The functions of the installation menu should be set by the person
installing the boiler or service personnel of the manufacturer.
IV.a) Main valve
IV.a.1) Switch on
This feature allows you to temporarily make the valve inactive.
IV.a.2) Set-point valve temperature
This setting is used to set the circuit
temperature to be maintained by the mixing
valve. This is the main temperature based
on which the room thermostat reduction
function is to be run. The room thermostat
reduction function is set separately for the
CH system (setting in the user menu) and
separately for each of the valves.
IV.a.3) Temperature control
This parameter determines the
sampling (control) frequency of the water
temperature downstream of the valve for
the central heating or hot water system. If
the sensor indicates a change in
temperature (deviation from set-point),
then the solenoid will open or close partially
by a preset step to restore the set-point
temperature.
IV.a.4) Opening time
You can use this function to set the
time for the full opening of the valve, that is
to say, how long it takes to open the valve
to 100%. This time should be selected
according to your valve actuator (shown on
the nameplate).

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IV.a.5) Single step
You can use this function to set a
percentage value for a single step in the
operation of valve opening, that is to say the
maximum percentage value of opening or
closing that the valve can move in a single
step (maximum movement of the valve in
one measurement cycle).
IV.a.6) Minimum opening
Use this function to set the minimum
value for valve opening. Below this value,
the valve will not close shut.
IV.a.7) Type of valve
You can use this option to select the
type of valve: central heating or floor type.
IV.a.8) Weather program (weekly valve program)
In order to enable the weather function an outdoor sensor should be installed in a place not exposed
directly to sunlight or weather conditions.
After installing and connecting the sensor the Weather program function must be enabled in the
controller menu.
For the valve to work properly enter set-point temperatures (downstream of the valve) for the
following four intermediate outside temperatures:
TEMP. FOR -20
TEMP. FOR -10
TEMP. FOR 0
TEMP. FOR 10

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Heating curve - curve which is used to determine the set-
point temperature of the controller based on the outside
temperature. In our controller this curve is established
based on four temperature set-points selected for their
respective outside temperatures. Set-point temperatures
must be provided for the following outside temperatures:
-20ºC, -10ºC, 0ºC and 10ºC.
The more points there are available for
constructing the curve, the greater is its accuracy, which
allows you to determine its shape in a flexible way. In our
case, four points seem to be a very good compromise
between accuracy and ease of setting its shape.
e in our controller:
XA = -20ºC, XC = 0ºC,
XB = -10ºC, XD = 10ºC,
YA, YB, YC, YD – set-point valve temperatures for their
corresponding outside temperatures: XA, XB, XC, XD
After weather control is enabled the valve set-point parameter is calculated based on the heating
curve. By changing this parameter you can decrease or increase all the weather control settings.
IV.a.9) Return protection
This feature allows you to enable
protection for the boiler from excessively
cold water returning from the main circuit,
which could cause the boiler to suffer from
low-temperature corrosion. The return
protection function works to ensure that
when the temperature is too low the valve
will close partially until the short circuit of the boiler reaches the desired temperature. This feature also
protects the boiler from a dangerously high return temperature to prevent water from boiling.
When this function is enabled you need to set the minimum and maximum return temperatures.
IV.a.10) Room thermostat reduction
This function is active only when the
unit is operated with a (standard or TECH)
room thermostat. When the room
thermostat reaches the desired
temperature in the house/flat (reports
heated up condition), the valve will close to
such an extent so that the temperature
downstream of the valve drops by the <room thermostat reduction> temperature.
NOTE: If the installation includes a TECH room thermostat with RS communication (four-wire cable), you
may choose an option providing dynamic control for the mixing valve.
IV.a.11) Operation of TECH thermostat
This setting is active only if the
controller is connected with a TECH room
thermostat (with RS communication) and
allows a choice in how the thermostat is to
work together with the mixing valve:
➔temperature reduction – when
you select this mode after heating up the
house/flat to your required temperature set-point temperature the TECH room thermostat will lower the

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set-point temperature of the valve by the pre-set room thermostat reduction value (see Section II.a.10);
➔dynamic changes - when you select this mode after heating up the house/flat to the set-point
temperature the TECH room thermostat will work as per the following settings:
➢Change in valve set-point. This setting determines by how many degrees the valve temperature
is to increase or decrease with a single unit change in room temperature. This function is closely related
to the Room temperature difference parameter.
➢Room temperature difference. This setting is used to define the single unit change in the current
room temperature (accurate to 0.1°C) at which there is to occur a specific change in the set-point
temperature of the valve.
Example:
setting: Room temperature difference 0.5ºC
setting: Change in set-point valve temperature 1ºC
setting: Set-point valve temperature 40ºC
setting: Set-point room thermostat temperature 23ºC
Case 1. If the room temperature rises to 23.5ºC (by 0.5ºC) the valve will close to such an extent as to
have 39ºC as a set-point (by 1ºC).
Case 2. If the room temperature drops to 22ºC (by 1ºC) the valve will open to such an extent as to have
42ºC as a set-point (by 2ºC).
IV.a.12) Factory settings
This parameter allows you to restore
the mixing valve settings saved by the
manufacturer. By restoring the factory
settings you will not change the valve type
setting (central heating or floor type).
IV.b) Valve 1
NOTE: Control with an additional valve (1 or 2) is only possible after you
purchase and connect the controller to an additional control module (ST-
61), which is not provided as standard equipment with the controller. In
order to control two valves you need to connect two ST-61 modules.
The options presented in this chapter are used to adjust the
operating settings of an additional mixing valve. In order for the valve to
work properly and meet your expectations it should be configured with its
parameters set like in the case of the main valve.
IV.b.1) Registration.
To register an additional valve enter the serial number of the control
module of the ST-61 mixing valve servo (look for the five-digit number on
the cover of this module). Without this number the valve cannot be
activated.
IV.b.2) Switch on
Setting as for the main valve.
IV.b.3) Set-point valve temperature
Setting as for the main valve.

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IV.b.4) Room thermostat
If the valve is to be operated with a room thermostat, you
should select its type:
➔module controller (traditional two-state type – “from the
module”),
➔standard or TECH controller (traditional two-state type – “from the
controller”),
➔TECH algorithm controller (RS communication),
✓room temperature difference (setting as for the main valve,
✓set-point change (setting as for the main valve.
IV.b.5) Temperature control
Setting as for the main valve.
IV.b.6) Opening time
Setting as for the main valve
IV.b.7) Single step
Setting as for the main valve.
IV.b.8) Minimum opening
Setting as for the main valve.
IV.b.9) Type of valve
Setting as for the main valve.
IV.b.10) Weather program (weather control)
Setting as for the main valve.
IV.b.11) Return protection
Setting as for the main valve.
IV.b.12) Additional sensors
When two mixing valves are used and you select this function
you will be able to select the sensors from which temperature data are
to be retrieved for a valve (for return and outside temperature sensors).
Temperatures can be retrieved from the sensors of the valve being set
(Own) or as per the controller sensors (Main controller).
IV.b.13) Room thermostat reduction
Setting as for the main valve.

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IV.b.14) External sensor adjustment
The external sensor is to be adjusted during installation or after
prolonged use of the thermostat if the outside temperature displayed
deviates from the actual one. Adjustment range: -10 to +10 OC with an
accuracy of 1OC
IV.b.15) Factory settings
Setting as for the main valve.
IV.b.16) Valve removal
This function is used to completely remove a valve from the
controller memory. Valve removal is used for example when removing
or replacing a module (the new module requires to be registered again).
IV.b.17) About the program
When this option is selected the display will show the software version of the active valve module.
IV.c) Valve 2
All settings for valve 2 are made in the same way as in the case of
valve 1.
IV.d) Room thermostat
With this setting you can disable or
enable the correct type of room thermostat
with a choice between a standard controller
(traditional two-state type) and a TECH
controller (with RS communication and the
ability to change settings for set-point
temperatures).
Additionally an option is also
available to show the software version of the room thermostat (available only for TECH thermostats).
If you connect the unit to a TECH thermostat you will be able to control and change the set-point
temperatures of the central heating and hot water systems and the mixing valve. Moreover, all alerts of
the boiler controller will be also displayed. With a mixing valve connected to the unit, you will be able to
view the current outside reading when in the main screen view showing the valve parameters.
NOTE: Do not connect any external voltage to the output of the room thermostat.
IV.e) GSM module
NOTE: Controlling of this type is possible after purchasing and
connecting, to the controller, the additional control module ST-65 which
is not attached to the regulator as a standard feature.

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The GSM module is an optional device cooperating with the boiler controller, enabling remote
control of the boiler operation with the use of a mobile phone. The User is notified with a text message
on each alert of the boiler controller, and by sending an appropriate text message at any time, he or she
receives a return message with the information on the current
temperature of all sensors. After entering an authentication code it is also
possible to remotely change the set temperatures.
The GSM module can also operate independently from the boiler
controller. It has two inputs with temperature sensors, single contact
input for use in any configuration (detecting short circuit/opening of
contacts) and one controlled output (e.g. possibility to connect additional
contactor to control any electrical circuit).
When any temperature sensor reaches the preset deactivation temperature, maximum or
minimum, the module will automatically send a text message with such information. It is similar in the
case of a short-circuit or opening of contact input, which may be used e.g. for simple protection of
property.
If EU-880 controller is equipped with an additional GSM module, in order to activate this device,
it is required to start the activated option (MENU> Installer menu> GSM module> Activated).
IV.f) Internet module
NOTE: Controlling of this type is possible after purchasing and connecting,
to the controller, the additional control module ST-500 which is not
attached to the regulator as a standard feature.
The Internet module is a device enabling remote control of the
boiler over the Internet or local network . On the home computer screen
the user controls the condition of all boiler system devices and the
operation of each device is presented in the animated form.
Apart from the possibility to view the temperature of every sensor,
the user has the possibility of introducing changes of the set temperatures
for both the pumps and the mixing valves.
After activating the Internet module and selecting the DHCP option,
the controller will automatically download such parameters from the local
network as: IP address, IP Mask, Gateway address and DNS Address. In the
case of any problems with downloading network parameters of the existing
network, there is a possibility of setting these parameters manually. The method of obtaining local
network parameters has been described in the instructions for the Internet module.
The function Reset module password may be used when the User, on the login page, has changed
the factory user's password to his or her password. When a new password is lost, it is possible to return
to the factory password after resetting the module password.
IV.g) Room thermostat equipment
This feature allows you to program the
operation of the room thermostat:
•Off – the status of the room thermostat
will not affect other settings
•Boiler – after the room thermostat
reports a heated up condition the set-point
boiler temperature will be lowered
•CH pump - after the room thermostat reports a heated up condition the CH pump will be turned
off

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IV.h) CH pump activation temperature
Use this option to set the activation
temperature of the CH pump. (temperature
measured at the boiler). The pump will start to
run above the pre-set temperature. The pump
will be switched off when the boiler
temperature drops below the activation
temperature (minus a hysteresis of 2°C).
IV.i) DHW pump activation temperature
Use this option to set the activation
temperature of the DHW pump. (temperature
measured at the boiler). The pump will turn on
and run depending on your selected mode of
operation above a pre-set temperature (e.g.
38OC). The pump will be switched off when the
boiler temperature drops below the activation
temperature (minus a DHW hysteresis of 2OC). In this particular case the pump will turn off at 36OC at
the boiler.
IV.j) Boiler hysteresis
This option is used to adjust the set-
point temperature hysteresis of the central
heating system. It represents the difference
between the temperature when the unit enters
holding cycle mode and the temperature when
it returns to operation cycle mode (for
example, when the set-point temperature is
60ºC and the hysteresis is 3ºC the unit will go into holding cycle mode when the temperature reaches
60ºC and return to operation cycle mode after the temperature drops to 57ºC).
IV.k) DHW hysteresis
Use this option to set your set-point
temperature hysteresis at the boiler tank. This
is the maximum difference between the set-
point temperature (your required temperature
for the boiler tank when the pump turns off)
and the temperature when its operation is to
resume.
Example: The set-point temperature is 55°C and the hysteresis value is 5oC. After the set-point
temperature (i.e. 55oC) is reached the hot water pump will turn off causing the central heating pump to
turn on. The hot water pump will be switched on again when the temperature drops back to 50oC.
IV.l) Additional pump
You can connect an additional pump
(circulating or valve type). When your pump
has been connected and depending on its type
you need to configure the appropriate settings.
1. Settings for circulating pump.
You need to enter settings for a daily
cycle of pump activation or downtime with an
accuracy of 30 minutes. To make setting the daily cycle of pump operation and downtime easier you can

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19
copy your selected time interval to the next.
After setting your operation schedule you need to set the times when the pump is to run and be idle
while your pre-selected time interval is active.
If necessary, you can also quickly remove previous settings to facilitate entering settings for new
intervals.
2. Settings for valve pump.
This option allows you to select the operating mode of the pump. The pump will be switched on:
always (pump running all the time regardless of temperature), above threshold (the pump will turn
on above a pre-set activation temperature). If the pump is to be turned on above a threshold, then you
should also set a temperature for pump activation threshold (temperature measured at the CH
sensor).
IV.m) Clock
You can use the clock settings to enter the
current time and day of the week.
IV.n) Pulser sensitivity
With this setting you can change the sensitivity of the pulser knob within a range from 1 to 3
(where 1 means the highest sensitivity).
IV.o) External sensor adjustment
The external sensor is to be adjusted
during installation or after prolonged use of the
thermostat if the outside temperature displayed
deviates from the actual one. Adjustment
range: -10 to +10 OC.
IV.p) Boiler tank disinfection
The purpose of the operation of thermal
disinfection is to increase the temperature to
a value required for disinfection (min. 60°C)
throughout the DHW circuit.
The latest regulations impose an obligation to
modify DHW installations in such a way as to
allow for periodic thermal disinfection to be
carried out at a water temperature not lower than 60°C (with 70° being recommended). The pipes,
fittings and technical system used for the preparation of hot water must meet this requirement.
The purpose of hot water system disinfection is to eliminate the bacteria Legionella pneumophila, which
causes reduction in the cellular immunity of the body. The bacteria often reproduce in standing hot water
reservoirs (their optimum temperature is 35°C), which often corresponds to the conditions present in
boiler tanks.
When this feature is enabled (available only in Boiler tank priority mode) the boiler tank is heated until
it reaches the user’s pre-set disinfection temperature and maintains this temperature for disinfection
time (e.g. 10 minutes) and then it returns to normal operation.
From the moment the disinfection function is enabled, the disinfection temperature must be reached
within a time no longer than the disinfection heating up time, otherwise, this function will be
deactivated automatically.

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V. Service Menu
To access the servicing functions of the EU-880
controller you must enter a four-digit code. This
code is known to the boiler manufacturer and
the company Tech.
VI. Protections
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.
VI.a) 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: 85O C. 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.
VI.b) 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.
VI.c) 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: "Temperature
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 temperature,
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.