TEKNIX ESPRO Series User manual

ELECTRIC
HEATING
BOILER
TEKNIX series ESPRO
OPERATING MANUAL
VERSION 2.1.

3
DEAR BUYER!
You have bought a boiler from TEKNIX, developed using modern technologies. The manufacturer thanks you for your
choice, as well as for trusting the products!
WARNING SIGNS, DANGER AND SAFETY SIGNS
WARNING!
OBLIGATORY ACQUAINTANCE WITH INSTRUCTIONS
DANGER OF ELECTRIC SHOCK
PROTECTIVE EARTHING
Read this Operating Manual carefully before operating the boiler! Adherence to the rules set
out in the Manual will ensure long-term, safe and comfortable operation of the boiler you
purchased.
Abbreviations used in the text
HS –heating system
DHW –hot water supply system

4

5
CONTENT
1. General provisions ..........................................................................................................................6
2. Instructions for connecting the boiler to your mobile device................................................... 9
3. Security measures.......................................................................................................................12
4. Technical characteristics and description................................................................................12
5. Installation manual ......................................................................................................................17
6. The order of operation................................................................................................................32
7. Maintenance.................................................................................................................................36
8. Transportation and storage........................................................................................................42
9. Disposal ........................................................................................................................................42
10. Warranty obligations ................................................................................................................. 42
11. Warranty card ............................................................................................................................43
12. Requirements for eco-design ....................................................................................................44
13. Detachable coupons.................................................................................................................49

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1. GENERAL PROVISIONS
1.1 The effect of this Guide applies to household wall-mounted electric water heater TEKNIX series ESPRO (hereinafter
- "boiler") models ESPRO-4.5, ESPRO-6, ESPRO-7.5, ESPRO-9, ESPRO-12, ESPRO-15, ESPRO-18, ESPRO-21,
ESPRO-24.
The boiler is designed for individual heating of apartments, residential buildings, premises and other facilities equipped with a
water heating system with forced water circulation, and is also used as a backup heating source. The boiler can also be used
to heat domestic water (DHW) in an external storage water heater indirect heating (boiler).
Industrial use of boilers for the production of heat for technological needs is prohibited.
1.2 TEKNIX electric boilers of the ESPRO series with a production capacity of 4.5 to 24 kW, designed to operate in both
single-phase and three-phase AC networks with a nominal voltage of 220 / 380V, a frequency of 50 Hz and a grounding
system TN-C-S, TN-S.
1.3 For boilers with a capacity of 4.5; 6 and 7.5 kW provides the ability to work in single-phase AC networks with a
frequency of 50 Hz and a nominal voltage of 220V.
1.4 The boiler meets the requirements of the Directives 2014/35/EU of the European Parliament and the Council on Low
Voltage Equipment (Low Voltage Directive LVD), Directive 2014/30/EU of the European Parliament and the Council on
Electromagnetic Compatibility Directive (EMC), confirmed by a certificate of conformity and declaration of conformity
(CE).
1.5 Installation and commissioning of the boiler is carried out only by an authorized service organization that has a
permit (license) for this activity and a certificate from TEKNIX.
1.6 The manufacturer reserves the right to make design changes that will not lead to deterioration of the technical
characteristics of the boiler.
1.7 The boiler is easy to operate, it can be operated by persons over eighteen years of age, as well as persons with
disabilities who have been instructed in the proper safe operation of the boiler and who are aware of the dangers of
non-compliance with the operating instructions in this manual.
1.8 RECOMMENDATIONS FOR BOILER CHOICE
1.8.1 When choosing a boiler, the heat loss of the room must be taken into account, which must not exceed the nominal
heat output of the boiler. For the correct and most cost-effective operation of the heating system, the boiler and related
equipment must be installed and used in accordance with the technical design developed in accordance with applicable
laws and regulations.
1.8.2 To connect an electric boiler to the mains, the user must have a permit from the local electricity supply
organization. The maximum power of the boiler can not exceed the allowable power.
1.9 OPERATING CONDITIONS
1.9.1 The boiler is designed to operate in rooms with ambient temperatures from + 5 ° C to + 40 ° C and relative humidity
up to 70%.
1.9.2 The boiler is not intended for work in damp and damp rooms, rooms with aggressive environment, saturated with
vapors of acids, alkalis and other substances, in explosive and flammable places.
WARNING!
Use of the boiler in conditions other than those specified in this Manual is considered to be
misuse.
Improper or improper use may endanger the health and life of the user or third parties, as well
as the risk of damage to the product and other property.
1.10 Use of the boiler for its intended purpose means compliance with the rules and instructions on the operation of the
product, timely inspection and maintenance set out in this Manual.
1.11 The package includes:плект поставки включає:
- electric boiler in a box (1 piece);
- Operation manual (1 piece);
- warranty card (1 piece);
- terminal jumper of the terminal box for connection to a single-phase network (for models ESPRO-4.5, ESPRO-6, ESPRO-7.5) (1
piece);
- boiler temperature sensor (1 piece);
- air temperature sensor (1 piece);
- mounting bracket with fasteners (1 set).

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WARNING!
When buying a boiler:
- require the trade organization to fill out a certificate of sale of the boiler and a warranty card.
- check the equipment and appearance. After the sale of the boiler, the manufacturer does not
accept claims regarding the complete set, appearance and mechanical damage to the boiler

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1.12 LABEL
QR code that
allows you to
download the
application
Download the mobile
management application:
Synchronize the
boiler with the
application:
The code contains all
the necessary
information about the
boiler
Technical
characteristics
of the model
Series
Model
Boiler serial number: 12345678901234567890
Unit Value
ESPRO
ESPRO - 18
Nominal heat output
Power consumption
Power supply
Amperage
The maximum temperature of the
coolant at the outlet of the boiler
kW
kW
Hz
А
°C
18
18
380В, 50 Hz
3х27
80
Nominal operating water pressure of МПа 0,04 - 0,15
Producer:
S Plusz K Technik Kft
Address
S Plusz K Technik Kft
Wai Adam Krt. 4-6/2 Ем.208
H-4400 Nyíregyháza, Hungary
: 04.08.2021
Product barcode
Electric boiler for heating and water
heating TEKNIX ESPRO
water in the heating system
The volume of the coolant in the heat
exchanger
L
2,8
Degree of protection
IP
20
Number
pcs
1
Mass, net
kg
7,8
Mass, gross
kg
9
Dimensions of the device (WxDxH)
mm
250х135х650
Dimensions in the box (WxDxH)
mm
294х195х680
:
« »

9
2. INSTRUCTIONS FOR CONNECTING THE BOILER TO YOUR MOBILE DEVICE
STEP-BY-STEP INSTRUCTIONS FOR CONNECTION:
1. Turn on your home network in the phone and turn on geolocation, you need to
know the network name and password to connect.
WARNING! Wi-Fi network must have a password..
2. Switch on the boiler in standby mode, the red button should light up on the screen.
3. To download a mobile application for remote boiler control, scan the QR code on your
boiler, or find a mobile application called "TEKNIX Smart boiler" in your mobile application
store (free download).
4. Enter your phone number to register and then the verification code.
5. Scan the QR code on the sticker of your boiler (or box). It has data on the model and serial
number, thanks to which the connection between the boiler, the application and the mobile
phone is established.
6. The next step is to choose your home Wi-Fi network. Connect to it and enter the password
from your network.
7. When connecting the program to the boiler via the Internet, wait for the full connection and
confirm all pop-ups.
8. Done. The functionality of the mobile application opens in front of you.
WARNING! Two devices cannot be connected to the boiler at the same
time, the program can be connected to only one device. To connect to
the second device - you need to disconnect on the previous one.
9. After entering the main screen, wait up to 15 seconds for the application to connect to the
boiler.

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MOBILE APPLICATION FUNCTIONS:
ON/OFF
Boiler on and off button.
After turning on the boiler, wait up to 15 seconds to establish contact with the
application..
HEATING TEMPERATURE ADJUSTMENT.
The main screen shows the current temperature in the heating system.
To regulate the current temperature you need:
1. Go to the"Heating" section.
2. Switch on the required heating mode: setting the air in the room or the
temperature in the system.
3. Move the temperature slider to the desired value.
4. Confirm changes.
Both settings (air temperature or system temperature) cannot work at thesame
time. The last setting works.
WARNING! If you set the mode settings manually, after
programming the settings for the week using the "Weekly
programmer" function, the latter function is automatically
switched off. To turn on the weekly programmer, you need
to go to this section and turn on the required programming
by turning it on by turning the candle to the "ON" position.
SWITCHING ON WATER HEATING *
Hot water temperature setting.
Displaythe current watertemperature in the system on the main screen. The
setting works similarly to the previous item.
* works only in the complete set of a copper, with the boilerof heating ofwater
connectedto system. In all other cases, the function is not active.
WEEKLY PROGRAMMER
Allows you to program repetitive weekly temperature settings for heating
and water heating. To use the programmer, go to this section and enable
thedesired function (switch logo).
You can program the operation of the boiler for heating and water heating
for each day of the week. The settings are set at three-hour intervals for
your daily comfort and savings. The weekly programmer settings start
working 5 minutes after the programmer function is activated.
WARNING!Switching on the weekly programmer switches off
the manual temperature setting, the manual settings are no
longer active. In order for the manual settings to work, you
need to turn off the "WEEKLY PROGRAMMER" function .

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OPERATING POWER ADJUSTMENT
Adjust the power and consumption of the boiler. Set different operating
power for water heating and heating.
PRIORITY CONSUMER AUTOMATIC POWER REDUCTION
FUNCTION
Set the lower value of the boiler power to which it will decrease if another
powerful device is switched on in the building. An important feature for
users who have a limited power limit.
For example: 7 kW of power is allocated to your apartment. The boiler
operates in 6 kW mode. And you still have an electric stove that requires
2.5 kW. You can set the priority consumer setting to 4.5 kW (depending
on the model) and the boiler will automatically drop to this value when
you cook. As soon as the load on the network becomes smaller - the
boiler turns on its standard set power again.
NOTIFICATION ON THE STATUS OF THE BOILER
This section contains information on communication problems or boiler
errors.
CAUSES OF PROBLEMS IN THE APPLICATION:
1. There is no connection of the boiler to Wi-Fi.
If there is no Internet connection in the room where the boiler is installed, the data from it is
not transferred to the mobile application and it works in the last set mode.
What to do: check the Wi-Fi router. Check if there is an Internet connection through the
router. Reboot the router. If the connection could not be restored - call our support service.
2. Error message E1-E7 has arrived.
Follow the steps on pages 34-35 of the basic boiler instructions.
3. The boiler is not connected to the new router, or you have changed the mobile
number.
You need to go to the "Settings" section in the upper right corner of the main screen of the
application. And press "Reset boiler Wi-Fi module settings".
Then register on p. 2 first.
If you have other difficulties in the operation of the mobile application, which are not
reflected in the instructions, go to the link splusktechnik.hu/help. There is an
extended library of answers to frequently asked questions related to the application.
Or call the hotline [phone] .

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3. SAFETY MEASURES
3.1 In case of improper use of the boiler or its misuse, there may be a danger to the health and life of the user or third
parties, as well as the risk of damage to the product and other material values..
3.2 Do not start the boiler without reading this manual in detail. Follow only the operations specified in the Operation
Manual..
3.3 The method of application of the boiler is defined in this Manual.
3.4 Installation, installation in accordance with the technical design, connection, commissioning and maintenance of the
boiler are carried out only by qualified specialists of the authorized service organization that has a permit (license) for this
activity and a certificate from TEKNIX.
3.5 During installation, operation and maintenance of the boiler, the requirements and safety measures specified in this
Manual must be observed.
3.6 The use of a circuit breaker to connect the boiler to the mains is mandatory. Consumption current and recommended
rated circuit breaker current are shown in Table 1.
3.7 IT IS PROHIBITED:
►block, interfere with the operation of protective devices and safety devices;
►violate the integrity of the body and components of the product;
►use elements, devices, devices not provided by the design;
►operate the boiler in case of non-compliance of the parameters of the electrical network set by the manufacturer, the
pressure of the coolant in the system;
►operate the boiler with the front panel removed;
►operate the boiler without grounding;
►use the boiler for other purposes;
►make changes to the design of the product;
►use the boiler in explosive and flammable areas;
►connect the boiler to the mains in case of freezing of the coolant in the heating system;
►switch on the boiler, which is not filled with water, with the shut-off valves of the shut-off valve connected to the heating
system closed;
►use the boiler as a flow heater;
►store flammable and explosive materials and products near the boiler (at a distance of less than 1 m) and on the boiler
body.
3.8 Visual inspection of the integrity of the insulation and protective earthing must be carried out before each switching on of
the boiler.
3.9 It is recommended not to turn off the power supply for protective functions and safety devices.
3.10 Before removing the boiler cover, be sure to turn off the power (turn off the external circuit breaker).
3.11 All inspection and maintenance work must be carried out only after the boiler power supply circuits have been
disconnected.
3.12 The boiler must always operate at the operating pressure, the range of which is set by the technical characteristics
(see Table 1).
3.13 The surface of the boiler can be cleaned only with non-flammable non-aggressive household appliances.
3.14 In case of emergency power failure, the boiler is switched off. After the power supply is restored, the boiler
automatically switches on and restores the last stored mode.
3.15 The manufacturer is not liable for any damage caused by improper or careless operation of the boiler.
4. TECHNICAL CHARACTERISTICS AND DESCRIPTION
4.1 Technical characteristics of boilers are shown in Table 1.
4.2 The boiler operates reliably throughout its service life in compliance with the operating conditions set out in this
Manual and timely maintenance.
4.3 The boiler device is shown in Figures 1, 2.
4.4 The coolant is heated in the heat exchanger flask. The number of heating elements and their power depends
on the boiler model (see Table 1). To extend the service life of heating elements, alternating switching on of heating
elements (rotation of heating elements) is provided.
4.5 Operation of the boiler is provided by the control unit.
The control unit controls the following parameters:
►value of coolant temperature at the boiler outlet;
►the value of the air temperature in the room where the temperature sensor is installed (supplied);
►temperature values in the DHW indirect heating boiler (if connected);

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►condition of the room thermostat (if connected, the thermostat is not included). The boiler maintains the air temperature
in the room according to the value set by the room thermostat;
►coolant flow in the boiler;
►input status of the "Priority Consumer" function;
►the amount of leakage current;
►the magnitude of the input voltage.
Also manages the work:
►circulating pump;
►heating elements;
►DHW three-way valve (not included).
4.6 A manometer is installed in the boiler to visually monitor the working pressure. The operating pressure range of 0.4 ...
1.5 bar is highlighted in blue on the manometer.
4.7 For safe and reliable operation, the boiler is equipped with protective mechanisms and safety devices that provide:
►Boiler protection against overpressure - the boiler has a safety valve to protect against overpressure. If the pressure value
exceeds 3 bar, the coolant is automatically discharged.
►Overheat protection - in case of coolant overheating in the heat exchanger bulb, the emergency thermostat switches off the
boiler power supply and, accordingly, the heating elements, regardless of the presence of a switching signal from the control
unit.
►Protection against the absence of water flow in the boiler - the boiler is equipped with a flow sensor. If the flow of water
through the boiler is reduced to less than 3.7 l / min, the heating is automatically switched off and an error code appears on the
boiler display.
►Protection against high voltage;
►Leakage current protection.

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Table 1 - Technical characteristics
PARAMETER DESCRIPTION
ESPRO
4,5
ESPRO
6
ESPRO
7,5
ESPRO
9
ESPRO
12
ESPRO
15
ESPRO
18
ESPRO
21
ESPRO
24
Power consumption, kW, no more
Coefficient of performance, %
Rated mains voltage, V,
Mains frequency, Hz
Type of mains grounding system
4,6
6,1
7,6
9,1
12,1
15,1
18,1
21,1
24,1
99
380 (1х220) ±10%
380 ±10%
50
ТN-C-S / TN-S
Current
consumption, A, no
more
At three-phase inclusion
At single-phase inclusion
7
20,5
9
27
11
34
16
40
5 x 2,5
3 х6
6 х
1,25
14
---
18
---
23
---
27
---
32
---
40
---
5 x 6
---
9 х
2,33
36
---
40
---
5 x 8
---
9 х
2,66
Recommended rated
current of the
switch, A
At three-phase inclusion
At single-phase inclusion
10
25
16
32
16
---
20
---
25
---
32
---
Recommended
cross section of
power cable with
copper core, mm
2
At three-phase inclusion
(3L+N+PE)
At single-phase inclusion
(L+N+PE)
5 х1,5
3 х4
5 x 2
3 х4
5 x 2,5
---
5 х4
---
5 x 6
---
5 x 6
---
Number of heating elements, their power, pcs.
x kW
3 х1,5
6 х1
6 х1,5
6 х2
6 х2,5
6 х3
Operating pressure range, bar
0,4 – 1,5
Maximum pressure, bar
3,0
Range of regulation of temperature of the heat
carrier on an exit from a copper, ° C
from + 30 to + 80
The maximum temperature of the coolant at the
outlet of the boiler, ° C
+ 80
Indoor air temperature control range, ° C
(according to the sensor included)
from + 10 to + 26
Range of regulation of temperature of water of
SGV in a boiler of indirect heating, ° C
from + 30 to + 60
Type of circulating pump
WILO Para 15/6
Pump power, W.
3 - 43
Temperature of operation of the emergency
thermostat of an overheat, 0C
+ 105
Minimum water flow through the
boiler, l / min
3,7
Volume of an expansion tank, l
6
Excess pressure of expansion tank, bar
Overall dimensions, mm, no more
- width
- depth
- height
Boiler weight without coolant, kg, no more
1,0
375
248
744
23
24
Connecting size
G3/4
Degree of protection
IP30
WI-FI module characteristics
- - wireless interface (standard) - 802.11, 2.4 GHz
- - operating modes: client (STA), access point (AP), client + access point (STA
+ AP). A dual-band router 2.4 GHz and 5 GHz is recommended

15
Figure 1 - Internal elements of the electric boiler.
Figure 2 - Boiler connection panel (boiler view from below).
Датчик температури
Air vent
Corps
Expansion tank
Control unit
Safety
thermostat
Heat exchanger
bulb
Terminal block
Thermal
insulation
Safety valve
Flow sensor
Circulation
pump
Heating elements -
heaters
Coupling Pn1 for
power cable input
Pn2 coupling
for sensor cables
Mounting
clips
Pn2 coupling
for sensor cables
Coupling Pn1 for
power cable input
Manometer 0-4 bar
G3 / 4 return input with SH
Output G3 / 4 "feed in SH
Exits of the air vent and the
safety valve

16
4.8 ADDITIONAL FUNCTIONS ARE PROVIDED WHEN OPERATING THE BOILER:
►"Antifreeze" - protection of the boiler from freezing when the temperature drops;
►"Child lock" - protection of the boiler control panel from accidental access;
►"Anti-Legionella", protection against bacteria in the indirect heating boiler (for a description of the function, see
Section 5 "Operating procedure. DHW mode");
►"Protection against blockage of the pump and the three-way valve" - protection against jamming of the pump and the
three-way valve SGV (in the presence of a contour SGV) at long shutdown of a copper;
►"Priority consumer" - automatic limitation of boiler power when receiving a signal from "Priority consumer" (requirements
for connection of "Priority consumer" see section 4.6 of this Manual);
►"Limitation of the maximum power of the boiler" - the possibility of software reduction of power if necessary or desired
by the User in different modes of operation of the boiler (heating and DHW);
►"Operation with a room thermostat" - the ability to control the operation of the boiler when connecting a room thermostat
(requirements for connecting a room thermostat are described in Section 4.5 of this Guide).
Detailed description of additional functions and possibilities for their adjustment and adjustment is given in Section 5.3
" Selecting and Adjusting the Operation Mode " of this Guide.
4.9 On the front panel of the boiler there is a touch control panel (display), the appearance of which is shown in Figure 3.
4.10 It is also possible to control the operation of the boiler through a specialized application. You can download the
application from GOOGLE PLAY (for Android users) or App Store (for iOS users). To do this, scan the QR code from
the Manual or the label on the boiler. Follow the link, install the application and after a short registration in the system,
connect your boiler to the application. For stable connection with the WI-FI module of the boiler, it is necessary to
place the router as close as possible to the electric boiler.
A description of the work is given in Appendix 1 to this Guide.
Figure 3 - View of the control panel (display).
Information symbols to signal the current state of the boiler
Digital display
Information symbols
panel
Increase button
Heating mode indicator
button. Alarm of the
current state and ON /
OFF heating mode
Button
decrease in magnitude
DHW mode indicator button.
Alarm of the actual state and ON
/ OFF of the heating mode of the
DHW circuit.
Indicator button
"SETTINGS"
Indicator button
"ON / OFF".
Alarm of the actual state ON /
OFF of the boiler
Indicator "Coolant outlet temperature"
Indoor "Indoor air temperature" indicator
Thermostat indicator
DHW tank heating mode indicator
Heating indicator
Pump indicator
Accident indicator
Anti-Legionella indicator

17
5. INSTALLATION MANUAL
5.1 GENERAL REQUIREMENTS
5.1.1 Installation, assembly, commissioning of the boiler must be carried out by qualified specialists of an authorized
service organization that has a permit (license) for this type of activity and a certificate from the company TEKNIX.
5.1.2 The boiler shall be installed inside a room in which the ambient air temperature range from + 5 ° С to + 40 ° С is
provided at a relative humidity not exceeding 70%, in a convenient place for maintenance.
5.1.3 If the boiler is unpacked in low temperature conditions, the installation of the equipment should be carried out not
earlier than 2 hours after introduction into a warm room in compliance with the requirements of Section 4 of this Manual.
5.1.4 Recommendations to the installation site:
►The room in which the boiler is installed must not contain conductive dust, chemically active substances;
►the distance from the boiler body to objects and structures made of combustible materials must be at least 1.0 m. If it is
impossible to ensure the specified distance, objects and structures made of combustible materials must be protected by non-
combustible insulating materials;
►The minimum free distances from the surfaces to the boiler body are shown in Figure 4;
►The boiler must not block passages, emergency exits;
►In the place of installation of the boiler the supply of engineering communications must be provided;
►The boiler must not be installed close to climatic appliances and devices that could damage the product (for example,
above the hob from which fat-containing vapors depart);
►It is forbidden to install a boiler in bathrooms and showers, where the influence of moisture and water is possible;
►The surface on which the boiler is suspended must be level, have sufficient load-bearing capacity to withstand the load of
the working weight of the product.
A ≥100 мм
B ≥200 мм
C ≥400 мм
D≥500 мм
Figure 4 - Minimum free distances from the surfaces to the boiler body
5.1.5 The boiler is designed for wall mounting. Prior to installation, make sure that the fasteners included with the boiler
can be used for a specific wall.
5.1.6 Fastening of the product is carried out according to Figure 5. The main dimensions are shown in Figure 6.
5.1.7 To remove the front panel, unclip the mounting clips at the bottom of the boiler body (see Figure 2), lift the panel
upwards, gently pulling on itself. Disconnect the display connection cable without abrupt movements while holding the
canopy panel. Then move the front panel to the side.
The front panel should be mounted in the reverse order.

18
Figure 5 - The order of fastening the product.
Figure 6 - Basic dimensions.
The back
panel of the
boiler
mounting bracket with
fasteners

19
5.2 CONNECTING THE HEATING SYSTEM
WARNING!
It is forbidden to use the boiler in open heating systems without excessive pressure..
5.2.1 Before the final installation of the boiler, the heating system must be rinsed several times with clean water
under pressure in the direction opposite to the flow of coolant
Pipeline
5.2.2 Pipes, fittings, connecting parts, heating devices (radiators) that meet the requirements of current regulations
(standards, regulations, etc.) must be used to connect the heating system. When choosing the material of pipes and
heaters must take into account the functional purpose of premises, buildings, structures, operating conditions, coolant
temperature, as well as service life and water quality requirements.
5.2.3 The piping of the heating system shall be laid in such a way as to prevent air congestion and to ensure constant
removal of air from the system. Valves and taps for air release should be located at the highest point of the system and
on all radiators. Pipes for heating systems must have a low coefficient of thermal linear expansion when heated and must
not allow air to enter the heating water.
5.2.4 Connection of the boiler to the heating system and DHW circuit should be carried out through shut-off valves for the
possibility of service maintenance of the boiler.
5.2.5 To protect against mechanical impurities, a strainer with a mesh size of at least 500 μm must be installed in front of
the boiler circulation pump.
5.2.6 In heating systems with variable coolant flow, it is recommended to use a hydraulic separator (hydraulic arrow)
between the boiler and the heating system. This will ensure optimal stable operation of the boiler and balance the
operation of the heating circuit.
WARNING!
Mandatory requirement when installing a boiler in heating systems without the use of a
hydraulic separator is the lack of control devices (thermal head, mixer, etc.) in the radiator
closest to the boiler, which will ensure a constant flow of coolant through the boiler at least
3.7 l/min.
Heat carrier
5.2.7 The manufacturer recommends using prepared water as a heat carrier for the heating system with ESPRO electric
boiler.
5.2.8 Water should have a pH above 7 and a minimum carbonate hardness of not more than 0.7 mg-eq/L.
5.2.9 The recommended coolant pressure in the system is 1.2 ... 1.5 bar.
Use of antifreeze liquids
5.2.10 To protect the boiler and the heating system, the manufacturer recommends using the "Antifreeze" function (for
details, see Section 6 "Operating Procedure" of this Manual. If this is not possible for any reason, high quality antifreeze
intended for heating systems may be used living quarters, the composition of which provides protection against corrosion
of the internal parts of the boiler, the circulation pump and the heating system as a whole.
5.2.11 If it is necessary to use antifreeze liquids, it is necessary to take into account their impact on the boiler and heating
system, taking into account the following features: reduced heat capacity, higher coefficient of volumetric expansion
rubber and fluoroplastic sealants.
WARNING!
For calculation and installation of heating system with use of not freezing liquids as the heat
carrier it is necessary to address in the specialized design and installation organizations
WARNING!
When using an indirect heating boiler for DHW, non-freezing liquids may only be used on a
food basis, provided that this is permitted by the boiler manufacturer.
5.2.12 The concentration of antifreeze in the heating system and in the boiler should not exceed 40%. In any case, follow
the recommendations of the antifreeze manufacturer.

20
WARNING!
When using non-freezing liquids, the coolant temperature at the boiler outlet must be limited to + 60 °
C in the service settings (see section "Service menu").
WARNING!
When putting into operation the boiler in the case of using non-freezing liquids as a coolant, the
representative of the service organization must enter the data in the coupon for commissioning.
Expansion tank
5.2.13 For stable operation of the heating system it is necessary that the pressure in the expansion tank was 1 atm
WARNING!
Check and adjust the air pressure (nitrogen) in the expansion tank should be carried out only by an
authorized representative of a specialized service!!
WARNING!!
If the water volume in the heating system is more than 60 l, an additional expansion tank must be
installed in front of the boiler on the return line from the heating system. The minimum volume of the
expansion tank (l) must be at least 10% of the volume of water in the heating system.
Circulation pump
5.2.14 The boiler is equipped with a Wilo PARA 15-130 / 6-43 / SC circulation pump with three operating modes. Factory
settings of the operating mode of the circulating pump - "Constant speed-III". When the pump is switched on, the indicator
of pump operation, operating mode and indicator III - speed are lit (see Figure 7).
WARNING!
Only an authorized representative of the specialized service department is allowed to make changes
in the operating mode of the pump!
5.2.15 The operating characteristics of the Wilo PARA 15-130 / 6-43 / SC pump set by the manufacturer (factory settings)
are shown in Table 2 and Figure 8.
Figure 7 - Wilo PARA pump control panel.
WARNING!
When changing the operating mode and operating speeds of the pump, it is necessary to ensure a
constant flow of coolant through the boiler at least 3.7 l / min.
WARNING!
If the heating system has more hydraulic resistance than the boiler pump can overcome, it is
necessary to install an additional pump on the return line to the boiler. The pump is selected
according to the design data for the heating system.
On / Off indicator.
Operating mode indicator
Speed indicator (1, 2, 3)
Control button