EUROSTER 4020 User manual

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 1
EUROSTER 4020
Wired, daily room thermostat, for all types of heating devices.
MANUFACTURER: P.H.P.U. AS, Chumiętki 4, 63-840 Krobia, Poland
In order to take full advantage of thermostat capabilities please read this installation and
operation manual carefully.
This manual is intended for the 11.07.2020 version of the thermostat.
1. THERMOSTAT APPLICATION
Euroster 4020 is a user-friendly thermostat designed for controlling the temperature in living
and utility rooms within the temperature range of 5 °C...35 °C. It is used to control the
operation of the CH boiler and other heating system components. It controls electrical
equipment, floor heating, and air-conditioning systems. The sensor used in Euroster
4020 enables temperature read-out and programming accuracy of 0.1 °C.
2. BASIC THERMOSTAT FUNCTIONS
•Function enabling a temporary decrease of the preset temperature
•Legible, backlit LCD
•Thermostat interlock with a selectable 3-digit code
•Operation in one of the following three operation modes:
✓Room temperature control mode
✓Floor temperature control mode
✓Temperature control with floor temperature limitation mode
•Simultaneous display of current and preset temperature value
•Enables hysteresis setting between 0.2°C and 10°C or PWM adjustment
•Temperature setting and read-out accuracy of 0.1 °C
•Possibility to switch the thermostat off after the heating season
•Discharged batteries indication
•Temperature read-out correction
•Surface mounting
3. THERMOSTAT VISIBLE ELEMENTS
BODY
a. Thermostat on/off switch
b. Thermostat control knob
c. Display

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 2
DISPLAY
a. Current temperature
b. Active function enabling the
temporary decrease of preset
temperature
c. Preset temperature
d. Active heating symbol
e. Active thermostat interlock symbol
4. INSTALLATION
4.1. Safety rules
CAUTION!
•Prior to the commencement of any installation works read this manual
carefully!
•Prior to mounting or dismantling the thermostat make sure that the heating
system is de-energized.
•Voltages hazardous to life may be present on thermostat output cables (power
supply phase voltage), therefore only qualified technicians may install the
thermostat!
•The electric connections performed and cables used shall be adequate to the
applied loads and must conform to all requirements!
•Do not install the thermostat in rooms with increased humidity; protect it
against water and other liquids!
•Do not install any thermostat showing signs of mechanical damage!
•The thermostat is not a safety component. Additional protection devices must
be used in systems prone to the risk of damage due to the failure of control
systems!
•The device is not intended for use by children!
•Should there be any problem with proper operation of the thermostat, please
contact your technician or the manufacturer!
4.2. Proper place of installation
The thermostat is designed for indoor installation. In order to ensure fully efficient operation of
the thermostat, please make sure that the following recommendations regarding the location
of the thermostat are observed:
•Locate the thermostat at the height of approximately 1.5 m above the floor
•Avoid places with strong sunlight, near heating or cooling devices, situated directly by
doors, windows, and other similar locations, where the temperature measurement could
be easily disturbed by external conditions.
•Avoid places with poor air circulation, e.g. behind furniture.
•Avoid moist places due to the negative effect of moisture on the service life of the
device.
4.3. Thermostat installation
The thermostat housing consists of two parts –a base (gray) with a cable connector and a
front panel with a display. Thermostat components are joined together by a connector and
clips. To separate the thermostat components hold the top and bottom part of the base and
use force to pull the base apart.
Prior to mounting the thermostat lead all necessary cables. Connect the thermostat using a
wire with a diameter adequate to the switched load. Mounting holes of the thermostat enable
installation in standard Φ 60 mm outlet boxes or directly on walls using screw anchors.
Unscrew the connector compartment cover, put the cables through the opening, fix the

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 3
thermostat base on the wall in possibly most horizontal position and tighten the cables. Having
finished the installation, check the correct connection of the cables. Retighten the joint cover.
4.4. Insertion and replacement of batteries
Place the batteries in the thermostat while observing the correct polarity. There are installation
markings in the battery compartment. Then install (snap) the thermostat onto the base.
CAUTION! Use only alkaline AAA batteries to power the thermostat. Do not use
rechargeable batteries because their voltage is lower and their effective time is
shorter.
It is recommended to replace batteries before each heating season.
4.5. Sample Connection Diagrams
The following diagrams are simplified and do not cover all elements necessary for the correct
installation.
In a system with a gas boiler
In a 230 V 50 Hz heating system
In a floor heating system

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 4
4.6. Floor temperature sensor connection
Screw the floor sensor to the TC connector (terminals no. 4 and 5) according to the above
sketch. It is not necessary to keep the cable polarization. After selecting “Sen” 1 or 2
operation mode, the floor sensor connection icon –„ ” appears on the display.
CAUTION! The floor sensor is not included in the basic thermostat kit. Please order it
separately.
5. SETTING TEMPERATURE
Use “” and “” buttons to set the desired temperature value. Pressing one of the buttons for
the first time activates the backlight, pressing it repeatedly lowers or raises the temperature in
increments of 0.1°C. The longer the button is pressed, the faster the values change. Confirm
the temperature change with the central button or wait until the set value stops flashing and is
stored. The factory setting is 20 °C.
6. FUNCTION ENABLING TEMPORARY DECREASE OF THE PRESET TEMPERATURE
()
It allows you to store the lowered temperature ( ) and its duration and the comfort
temperature ( ) that will remain in effect for the remaining time of the day. The preset
program will be executed on every day of the week.
To activate the function:
•Use the “” buttons to set the comfort temperature
•Confirm with the central button
•Press and hold the central button for 3 seconds
•The display shows the flashing value to be used as lowered temperature ( symbol),
•Use “” buttons to set the desired temperature value
•Confirm with the central button
•then use the “” buttons to set the duration of the operation with lowered
temperature.
•Confirm with the central button
From this point on, the thermostat runs the program for all days of the week. For the duration
of the operation with decreased temperature symbol is displayed and the symbol is
displayed for the remaining time of day.
In order to change the set temperatures without disabling the function:
•Press the right-hand “ “ button
•Press the right-hand button again –select comfort or reduced temperature
•Use “” buttons to set the desired temperature value
•confirm with the central button.
In order to disable the function, hold down the central button for 3 seconds.
The function of temporarily lowered temperature can be set to between 1 and 23 hours.
7. TEMPORARY CHANGE OF TEMPERATURE
During the thermostat operation with the temporarily lowered temperature, use “” and “”
buttons to change temperature. However, the changed temperature value is only valid until the
next change resulting from the preset lowering period. For the time of temporary operation
with changed temperature “ ” symbol is displayed.
8. THERMOSTAT CONFIGURATION
Press and hold the central and right buttons for approximately 2 seconds to enter the setting
mode. Configure the thermostat in the following way: choose a required parameter with “”
and “” buttons, use the central button to enable the introduction of changes and change the
value using “” and “”, then confirm the modified value with the central button. The
following parameters may be changed:

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 5
•Temperature range limit –low (LO)
This parameter allows you to limit the temperature range to be set. This parameter
limits the lower values of the range.
Default value 5°C.
•Temperature range limit –high (HI)
This parameter allows you to limit the temperature range to be set. This parameter
limits the higher values of the range.
Default value 35°C.
Example:
In order to set a preset temperature between 18 °C and 23 °C, you must set the "LO"
value to 18 °C and the "HI" value to 23 °C.
•Hysteresis/PWM (H)
Two operational options of activating the heating algorithm are available: hysteresis or
PWM.
In the case of hysteresis, the device is activated based only on a difference between the
preset and current temperature. The parameter determines the accuracy of room
temperature control. You may set the hysteresis between 0.2 °C and 10 °C, and the
factory setting is 0.4 °C.
Setting the value to 0.0 will put the thermostat into PWM mode.
PWM is a more advanced method to achieve the preset temperature. It is suited for
systems with underfloor water heating. It is used to limit room temperature fluctuations.
Unlike in on/off controls the current status of the transmitter depends not only on the
current difference between the preset and measured temperature but also on the past
changes of temperature. PWM operates with fixed parameters:
✓Minimum relay activation time of 3 minutes,
✓Number of cycles per hour - 4
✓Operating range of the PWM algorithm of 0.7 °C.
• Thermostat interlock (Pin)
The thermostat features a keypad lock function. A three-digit code of your choice may
be entered. In such a case it is not possible to change the settings. The interlock does
not affect the thermostat operation. To activate the interlock, change “OFF” to “On”, in
the menu, confirm with the central button, then enter the code using the “ ” buttons.
Confirm each digit with the central button. Active interlock is indicated by displaying
icon. The interlock is active after 10 minutes. The interlock is disabled in the same way.
This function is not active by default.
• Temperature sensor correction (C)
It is a value added to or subtracted from the measured temperature value. It adjusts
the displayed temperature within the range of +/- 5 °C. The function is convenient if
the thermostat is located in a slightly warmer or cooler area of the room.
• Heating / Cooling (t)
Select whether the thermostat operates in heating —“ ” symbol or cooling “ ”
symbol mode.
In the cooling mode, the device connected to the thermostat will be switched on when
the temperature increases above the preset level.
• Selection of temperature sensor (Sen)
This option permits the selection of a temperature sensor to cooperate with the thermo-
stat. There are three operation modes available:
✓0–the thermostat measures and maintains the temperature based only on in-
ternal sensor operation
✓1–the thermostat measures and maintains the temperature based only on ex-
ternal (cabled) sensor operation
✓2–the thermostat measures the temperature of both sensors; it maintains the
temperature of an internal sensor, and the external sensor acts as a temperature

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 6
limit. Having selected this operation mode set the floor temperature limit value.
This parameter is used to establish the maximum safe floor temperature. When
the preset temperature is reached, the heating gets switched off.
• Reset (rEs)
When you change the value from 0 to 1, the thermostat restores factory settings.
• Exit (ESC)
Press the central button to make the thermostat exit the service mode.
You may also exit the menu by pressing the left “ " button.
9. TEST MODE (tSt)
In the test mode, you may check the main parameters of the thermostat. To enter the test
mode press and hold the central and “ ” button for approximately 2 seconds.
The following tests are available:
•internal sensor temperature measurement
•external sensor temperature measurement - press the central button,
•relay test - press the lower “ ” button repeatedly to switch the relay on/off,
•backlight test –press the upper “ ” button repeatedly to switch the backlight on/off.
10. SWITCHING THE THERMOSTAT OFF
When the switch is moved, the thermostat goes into the frost protection mode. icon appears
on the display. Frost protection ensures that the heating is turned on only to prevent
temperature dropping below 4°C.
11. ERROR INDICATION
OP –sensor missing or damaged
SH –short-circuit of sensor or a damaged sensor
Err 1 –internal error–remove and after a few moments reinstall the batteries.
–discharged batteries icon.
12. MAINTENANCE
Do not use solvents and aggressive detergents to clean the thermostat, since they may
damage the surface of the housing and the display. Clean the thermostat housing with a soft
cloth.
13. DIMENSIONS

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 7
14. TECHNICAL DATA
Controlled device air-conditioning / heating systems
Supply voltage 3 V (2 pieces of AAA batteries)
Thermostat output relay, voltage-free type, SPST (normally open)
Maximum load 5 A 230 V 50 Hz
Temperature measurement range 0 °C...+99°C
Temperature control range +5 °C...+35 °C
Temperature control accuracy 0.1°C
Temperature read-out accuracy 0.1 °C
Hysteresis range: 0.2 °C... 10 °C with 0.1 °C step of the change or
PWM mode
Visual signalization: backlit LCD
Operating temperature +5 °C...+45 °C
Storage temperature: 0°C...+50°C
Ingress protection rating IP20
Color white/gray
Installation method wall mount, flush back box Φ 60 mm or screw
anchors
Thermostat weight without batteries 125g
Warranty period 2 years
Thermostat class IV
Thermostat contribution to the seasonal
energy efficiency of room
heating 2 % (PWM mode)
15. KIT CONTENTS
•Euroster 4020 thermostat
•2 pieces of AAA batteries
•screw anchors
•Installation and Operation Manual with Warranty Certificate
16. SIMPLIFIED DECLARATION OF CONFORMITY
P.H.P.U. AS AGNIESZKA SZYMAŃSKA-KACZYŃSKA hereby represents that the type of
EUROSTER 4020 equipment conforms to the following directives: 2014/35/EU (LVD),
2014/30/EU (EMC), 2011/65/EU (RoHS).
The complete text of the Declaration of EU conformity is available at the following Internet
address: www.euroster.pl

EUROSTER 4020 –INSTALLATION AND OPERATION MANUAL 8
17. ELECTRONIC WASTE MANAGEMENT INFORMATION
This product is designed and manufactured from high-quality materials and components
suitable for reuse.
The crossed-out wheelie bin symbol located on the product (Fig. 1) means that the
product is subject to selective collection in accordance with the provisions of the Directive
2012/19/EU of the European Parliament and of the Council.
The product contains batteries, which are marked with a crossed-out wheelie bin symbol
(Fig. 1). The batteries are subject to selective collection in accordance with the provisions of the Directive
2006/66/EC of the European Parliament and of the Council.
Such marking informs that the electrical and electronic equipment, as well as batteries and accumulators,
may not be disposed of together with other household waste after their service life has ended. The user is
obliged to take the used devices and batteries or accumulators to a point of collection of waste electrical
and electronic equipment and batteries and accumulators. The entities collecting such equipment,
including the local collection points, shops, and municipal entities, set up an appropriate system enabling
handover of such equipment and batteries and accumulators. The proper disposal of waste equipment,
batteries, and accumulators contributes to the prevention of consequences hazardous to the health of
persons and nature, resulting from the possible presence of hazardous components in the equipment and
batteries and from inaccurate storage and processing of such equipment, batteries, and accumulators.
Households play an important role in contributing to reuse and recovery, including recycling, of waste
equipment. The attitudes influencing the protection of the common good of a clean environment are
shaped at this level. Households are also one of the larger users of small equipment and its rational
management at this stage impacts the recovery of recyclables. Inaccurate disposal of this product may be
penalized in accordance with national legislation.
WARRANTY CERTIFICATE
EUROSTER 4020 thermostat
Warranty terms:
1. The warranty is valid for 24 months from the device sale date.
2. The claimed thermostat together with this warranty certificate must be supplied to the
seller.
3. Warranty claims shall be processed within 14 business days from the date the
manufacturer has received the claimed device.
4. The device may be repaired exclusively by the manufacturer or by other parties clearly
authorized by the manufacturer.
5. Warranty becomes void in case of any mechanical damage, incorrect operation, and
repairs made by unauthorized persons.
6. This consumer warranty does not exclude, restrict nor suspend any right of the Buyer
ensuing if the product would not meet any of the sale contract terms.
...................................................................................................................................
Sale date
serial number/date of
manufacture
Stamp
and signature
Service:
Phone No. 65-57-12-12
A business entity that issued this warranty certificate is:
P.H.P.U. AS Agnieszka Szymańska-Kaczyńska, Chumiętki 4, 63-840 Krobia, Poland