Flexiheat ThermoExtra 28 kW User manual

INSTRUCTIONS FOR INSTALLATION AND USE TMS-UT-0621-Z01-1
We reserve the right of alternations
ELECTRIC BOILERS FOR CENTRAL HEATING
INSTRUCTIONS FOR INSTALLATION AND USE
ThermoExtra
28-96kW

INSTRUCTIONS FOR INSTALLATION AND USE TMS-UT-0621-Z01-1
We reserve the right of alternations

INSTRUCTIONS FOR INSTALLATION AND USE TMS-UT-0621-Z01-1
We reserve the right of alternations
Contents
General ................................................................................................................................. 6
1. Introduction ....................................................................................................................... 7
1.1. Applicable documents ................................................................................................. 7
1.2. Retention of documents .............................................................................................. 7
1.3. Introduction ................................................................................................................. 7
1.4. Heating curves............................................................................................................ 7
1.4.1. Availability of heating curves................................................................................. 7
1.4.2. About Heating curves ........................................................................................... 7
1.4.3. Why does the characteristic heating curve have to be set? .................................. 8
1.4.4. Corrections of the room temperature .................................................................... 8
1.4.5. Limiting the minimum and maximum temperature of water in the boiler................ 9
1.5. Functionality of hot domestic water ............................................................................. 9
1.5.1. Availability ............................................................................................................ 9
1.5.2. Description ..........................................................................................................10
1.6. Frost protection ..........................................................................................................10
1.6.1. Avaliability ...........................................................................................................10
1.6.2. Domestic water....................................................................................................10
1.6.3. Central heating ....................................................................................................10
2. Boiler specifications..........................................................................................................11
2.1 Dimensions .................................................................................................................11
2.2 Hydraulic pressure drop and recommended flows.......................................................12
2.4. Power supply characteristics
3. General requirements.......................................................................................................14
3.1 Contents included in delivery ......................................................................................14
3.2 Preliminary remarks ....................................................................................................14
3.3. Recommendations for various installation types.........................................................15
3.4. Installation site ...........................................................................................................15
3.4.1. Position of a boiler ...............................................................................................15
3.4.2. Power supply.......................................................................................................16
3.5. System requirements..............................................................................................16
3.5.1. Pipe work.............................................................................................................16
3.5.2. Cleansing and flushing the system ......................................................................17
3.5.3. Filling and preparing heating system ...................................................................17
3.5.4. Pressure relief valve ............................................................................................17
3.5.5. Expansion vessel.................................................................................................17
3.5.6. Circulating pumps................................................................................................17
4. Boiler installation sequence ..............................................................................................18
4.1. Transporting the appliance.........................................................................................18
4.2. Select position for boiler.............................................................................................18
4.3. Fitting the boiler hanging bracket ...............................................................................18
4.4. Removing/fixing the front and top case ......................................................................19
4.5. Pipe work connection.................................................................................................19
4.6. Power supply connection ...........................................................................................20
4.7. Connecting temperature sensors or external electrical controls .................................21
4.7.1. Accessing sensor terminals .................................................................................21
4.7.2. Connecting external temperature sensor .............................................................21
4.7.3. Connecting domestic hot water temperature sensor ............................................21
4.7.4. Connecting room thermostat and time switch ......................................................22
......................................................................................12
2.5. Function elements of Thermo boilers ...........................................................................13

INSTRUCTIONS FOR INSTALLATION AND USE TMS-UT-0621-Z01-1
We reserve the right of alternations
4.8. Filling the heating system...........................................................................................22
5. Commissioning.................................................................................................................23
5.1. Central heating system check ....................................................................................23
5.2. Preliminary electrical check........................................................................................23
5.3. Graphic control panel (all options) ..........................................................................24
5.3.1. Control panel display.......................................................................................25
5.3.2. Entering and navigating user menu .................................................................26
5.3.3. Example how to change date and time............................................................26
5.3.4. Selecting active modes ...................................................................................27
5.3.5. Selecting domestic hot water temperature.......................................................27
5.3.6. Temporary override heating curves (Turbo Mode)...........................................28
5.3.7. Offsetting Heating curve..................................................................................28
5.3.8. User menu options ..........................................................................................28
5.3.9. Entering and navigating service menu.............................................................29
5.3.10. Reset service interval ..................................................................................30
5.4. Control mode (0-10V analog signal)...........................................................................31
5.4.1. Connection to PCB ..............................................................................................31
5.4.2. Remote control settings.......................................................................................31
5.4.3. Remote control instructions .................................................................................32
5.4.4. Analog output signals ......................................................................................34
5.5. Service menu options.............................................................................................35
6. Periodic checking .............................................................................................................36
7. Survey of possible malfunctions and irregularities in operation.........................................37
7.1. General list.................................................................................................................37
7.2. List of errors...............................................................................................................38

INSTRUCTIONS FOR INSTALLATION AND USE TMS-UT-0621-Z01-1
We reserve the right of alternations

Page 6
General
•Keep these instructions close to the boiler!
•The boiler must not be modified, changed or rebuilt.
•The correct settings are important for economical heating.
•The type and serial number of the boiler must be quoted whenever you contact
manufacturer or service, see the identification plate.
General safety instructions!!
- Children shall not play with the appliance.
- Cleaning and user maintenance shall not be made by children without supervision.
- Children should be supervised to ensure that they do not play with the appliance.
- Boiler is not intended for outdoor use.
Technical safety instructions!!
manufacturer,
- Switch off main power by MCB before opening the boiler.
- Boiler has built-in frost protection. When the boiler is not in use, leave the main power
active that protection stay active.
Read this document carefully before carrying out any
installation, adjustment or service and follow the
instructions
- Keep the water pressure between recommended limits – see chapter 3.4.3, page 7. -
Do not install boiler close the heat source (for instance, fireplace, wood stove etc…).
- Incompetent repairs can cause serious danger to users.
- Defective parts may be replaced only by the original or approved by the

Page 7
1. Introduction
Thank you for the confidence you have shown to us by purchasing our central heating boiler.
In order to use the boiler to the utmost correctly and safely, and above all economically, read
thoroughly these instructions before continuing with installation.
The appliances must be installed by a competent person, who is responsible for adhering to
the existing regulations, rules and guidelines.
1.1. Applicable documents
The following additional documents are provided with the appliance:
For the owner of the system:
Instructions for use
Warranty card
For the qualified technician:
Instructions for installation
Electrical drawing for the appliance
1.2. Retention of documents
Please pass on this installation manual to the owner of the system. The owner should retain the
manuals so that they are available when required.
1.3. Introduction
1.4. Heating curves
1.4.1. Availability of heating curves
The modern way of heating is based on energy saving and automatic adjustments to warm up the
space.
To achieve the required temperature electric boiler with electronic control panel heats the water in the
boiler automatically depending on the external temperature. There is no need to look after the minimal
working temperature because electric boilers do not dew and that means that the temperature of the
water in the boiler is at the same time the temperature in the heating elements (for example in
radiators, convectors etc.).
To achieve the desired room temperature, the characteristic heating curve has to be chosen
depending on the characteristics of the object and the heating system.
ThermoExtra are economical central heating boilers that may be used as an independent or additional
source of heat.
ThermoExtra boilers offer you a possibility to reduce the power of the heater if necessary. The
power may be switched on automatically when necessary with built-in step regulator or
manually with switches on the control board. In this way it is possible to adapt the boiler to
the utmost to circumstanceson the spot.
The boiler operates on a principle of rapid heating smaller water quantities, so that exploiting energy is
already 100%.
They are particularly suitable for heating smaller business premise, where you are short of space
(small apartments, efficiency apartments, representation offices, smaller coffee-shop spaces etc.) or
for heating larger spaces in early season when the main boiler is over dimensioned.
ThermoExtra are manufactured with upper and bottom connections so costumer would be able
to choose which of them will be used for system connection. Temperature operation area is from 20 oC
to 90 oC.
ThermoExtra boilers are designed in such a way that in apartment-contained central heating they can
fit well with your furniture.
Use of heating curves, temperature compensation, is limited to ThermoExtra boilers with option C and V.
1.4.2. About Heating curves

Page 8
Factory defined curves
If the heating curve is set optimally for heating of your apartment or house, corrections will not
be necessary.
1.4.3. Why does the characteristic heating curve have to be set?
After the first settings of the heating curve authorized person can adjust, correct that curve if
necessary.
Every heating room is built up differently. Different heating elements and heating systems can be used
(radiators, under floor or combined heating) and every building has a different thermal insulation.
For the maximum exploitation of the heating and maximum energy savings, characteristic heating
curve has to be set using the parameter on the control panel, in a way that the chosen heating curve is
suitable for the heating system and for the quality of the building.
1.4.4. Corrections of the room temperature
Based on the experience, factory settings of the device are for the average insulated object and room
temperature of 22oC. If factory settings are not adequate for achieving the desired room temperature,
supplemental adjustments of the standard heating curves can be made.
Changing the inclination
When changing the heating curve, inclination is changing too, and in that way the temperature of
water in the boiler is changing when the external temperature is low (below+ 5oC).
Level changes - offset
By offsetting the heating curve for the chosen value the temperature of water in the boiler is changing
without changing the shape of the curve.
Values in the table below are used for the orientation and the user can change them any time as
he/she wishes to.
Experience has shown the following (for the average building quality):
when the temperature of water for heating changes from 5 to 7oC that will change the room
temperature by approximately 2oC.
Thermal (heating) processes are slow, all corrections function after a period of time. It would
be better if further corrections were made a day or two later.
To gain experience, we suggest that you should write all corrections (within a period of searching for
the right parameters) in the protocol of the corrections.
In the table below you can find instructions how to correct the heating curve for the radiator heating
depending on the achieved room temperature.

Page 9
Inclination of the
curve
Offset
Factory settings
1,5
0
Room temperature is too low if the external temperature is
above + 5
o
C
Change with the first
lower curve
Add with offset
+ 6
o
C
Room temperature is too low if the external temperature is
between + 5
o
C and - 5
o
C
Leave the curve 1,5
Add with offset
+ 3
o
C
Room temperature is too low if the external temperature is
below - 5
o
C
Change with the first
higher curve
Leave offset
0
o
C
Room temperature is too high if the external temperature is
above + 5
o
C
Change with the first
higher curve
Lower with offset
- 6
o
C
Room temperature is too high if the external temperature is
between + 5
o
C - 5
o
C
Leave the curve 1,5
Lower with offset
- 3
o
C
Room temperature is too high if the external temperature is
below - 5
o
C
Change with the first
lower curve
Leave offset
0
o
C
Sample of modified curve
In acombined heating system, radiator and under floor heating, or other heating elements, the
temperature of water in the boiler has to be chosen in a way to achieve the highest desired
temperature. On the parts of heating where temperature of the primary flow has to be lower, one
element has to be built in such as motorized three-way valve that is controlled by room thermostat,
thermostat valve for limiting the temperature of the return flow or something similar.
1.4.5. Limiting the minimum and maximum temperature of water in the boiler
1.5. Functionality of hot domestic water
1.5.1. Availability
If the heating curves and offset are selected correctly and room temperature is falling, in transitional
period in heating seasons (autumn, spring) minimal temperature of water in the boiler has to be
changed.
If a building cannot accumulate heat (sudden and short warming during the day) necessary
temperature of water in the boiler will be too low and will not keep up the desired room temperature.
Limitation of the maximum temperature of water in the boiler serves more as a protection. Factory
setting is at 90oC, and we suggest lowering it at approximately 80oC. Limitation of the maximum
temperature of water in the boiler is also used in central heating and domestic water preparation
system, and because of that it is not advisable to lower that temperature too much because the
domestic water will warm up slowly on higher temperatures.
It is possible to produce domestic hot water in an indirect water cylinder with heat
exchanger by using Thermo Extra.

Page 10
1.5.2. Description
1.6. Frost protection
1.6.1. Avaliability
1.6.3. Central heating
Domestic water production has apriority order over central heating. At the moment of signaling the
Frost protection can be also provided by the useof an appropriate room thermostat. When frost
protection is controlled by room thermostat, please consult room thermostat manuals for more details.
1.6.2. Domestic water
If the boiler is on for supply and heating or both (heating and DHW production) are off, the
protection from freezing of water in the central heating system switches automatically on if the water
temperature sensor in the boiler reads the value below 8°C. In this case the temperature of water in
the boiler is maintained at 8°C, until the conditions of possible freezing disappear. Switching on is
signaled by the blinking display, as well as by the LED diode of the heater and the boiler.
In this case, domestic water conditioning has priority.
In order for the freezing protection system of central heating to operate, the room thermostat should be
in the position of freezing protection, too (otherwise, the circulation pump of central heating would not
operate).
need for heating up the domestic water cylinder by the domestic water temperature sensor, the
central heating circulation pump is switched off and the circulation pump for domestic hot water is
switched on.
Heaters regulate the desired water temperature in the boiler that is by 25°C higher than set values of a
desired domestic water temperature (independent of the central heating curve).
The circulation pump for domestic water cylinder is activated un til the desired temperature of domestic
water is reached, upon which, it is switched off with the previously described and programmed time
delay.
If the central heating is off, at the moment of reaching the desired domestic water temperature, the
desired water temperature in a boiler is set to the minimum value of water temperature in the boiler (stand
by).
At repeated request for heating the domestic water cylinder th e desired water temperature in the
boiler is set to 25°C higher than set values of the desired domestic water temperature.
The domestic hot water circulation pump is switched on as late as the water temperature in the boiler
reaches the same or higher temperature than the desired value of domestic water temperature.
The 5°C difference for warm water conditioning is programmed. It means that if the desired
temperature of domestic water tank is 60°C, then central heating will be switched off and domestic
water conditioni ng switched on as late as domestic water temperature is lower than 55°C, and heating
will be switched on and domestic water conditioning switched off when the temperature in domestic
water tank reaches 60°C and when the programmed time of supplemental operation of domestic water
circulation pump has passed.
If the time for domestic hot water production is longer than 30 min, especially if the desired temperature of
the domestic water cylinder is not reached within 30 min, the process will be automatically
interrupted and will switch to the heating reg ime , which in this case lasts for at least 30 mins.
If the boiler is on for supply and only domestic hot water production is on or only heating or both,
the protection from freezing of water in the indirect cylinder switches on automatically when the
temperature sensor of indirect cylinder reads the value below 7°C, signaling switching on by blinking
display, as well as the LED diode of the heater and warm water conditioning, regulating the domestic
hot water cylinder temperature to 7°C.

Page 11
2. Boiler specifications
Capacity
Lit.
Weight
kg
Maximum
operating
pressure
Power supply
28
A400
B 930
C310
D162
E 115
F109
45
400V 3N ~ 50/60 Hz
32
36
40
44
48
52
56
60
64
A550
B 930
C310
D316
E 115
F175
72 2”
72
80
88
96
Power
kW
TECHNICAL DATA FOR THERMO EXTRA BOILERS
BAR
2.5
1½”
F & R
CONNECTIONS
BSP MALE
Dimensions
mm
2.1 Dimensions
Thermo Extra
19
32

Page 12
2.4. Power supply characteristics
min. conductor's cross-section in mm2is based on maximum length of 20 m.
POWER Nominal
current
Fuse current Rated short-
circuit
breaking
capacity
Icn (EN 60898)
Rated short-
circuit
breaking
capacity
Icn (IEC 947-2)
Min.
conductor's
cross-section
Fuse type RCCB switch
type
400V 3N ~ 50/60 Hz
28 kW 40,58 A50 A 5 x 10 mm2
32 kW 46,38 A
63 A B63-336 kW 52,17 A5 x 16 mm2
40 kW 57,97 A
44 kW 63,77 A80 A
50 kA 105 kA
5 x 25 mm248 kW 69,57 A
52 kW 75,36 A
100 A56 kW 81,16 A
5 x 35 mm2
60 kW
86,96 A
64 kW 92,75 A125 A
72 kW 104,35 A5 x 50 mm2
80 kW 115,94 A
160 A88 kW 127,54 A5 x 70 mm2
96 kW 139,13 A
2.2 Hydraulic pressure drop and recommended flows
Pressure drop for ThermoExtra
(0.3A Thermo
Extra)
NH 160 A 0.3A
B50-3
63 / 0.03 A

Page 13
1. Primary flow
6. Electrical heaters
2. Return flow 7. Control panel
3. External boiler jacket
8. Inducers for el. Connections
4. Boiler 9. Contactors
5. Heat insulation
10. Charge and discharge valve
2.5. Function elements of Thermo boilers
ThermoExtra

Page 14
3. General requirements
3.1 Contents included in delivery
Contents included with delivery
Instructions for use
Electrical drawing
Warranty card
Pump’s manual
3
1
Hanging bracket
4
1
External temperature sensor (optional)
5
1
Water cylinder temperature sensor (optional)
Table of contents included with delivery
3.2 Preliminary remarks
Item Quantity Description
1 1 ThermoExtra boiler
2 1 Instructions for installation
Note:
Item 4 is only delivered with ThermoExtra option O or
V. Item 5 is only delivered for ThermoExtra option V
ThermoBlok and ThermoBlok PTV boilers are delivered pre-mounted in a package unit. Make sure
that all parts have been delivered intact. For the exact list of parts see the figure and table below. If
parts are damaged or missing, please consult our local sales office.
When connecting the appliance to the fixing wiring, the means for disconnection (MCB) must be
incorporated in fixing wiring in accordance with the local wiring rules.
If safety valve 2.5 Bar is not located in the existing installation,a safety valve provided must be
installed.
If boiler is not connected to room thermostat or boiler is out of function during winter time, there is a
danger of installation freeze. In this case the should be filled with antifreeze liquid for central heating, if
this is not possible water should be drained out of the system with the help of charge and discharge.
Recommended pressure of central heating installation is 0.15 Mpa (1.5 Bar), maximum pressure is
0.25 Mpa (2.5 Bar) and minimum 0.08 Mpa (0.8 Bar).

Page 15
3.3. Recommendations for various installation types
Following flow chart is provided in order to help installers choosing the right type of boiler for desired
installation type. At the end of each tree is the number of corresponding appendix. Each appendix
consists of the following: the hydraulic drawing, a typical electrical drawing, the description of
connection plate, the description of control panel, and the description of the complete central heating
system.
Central heating
type
Control panel
Central heating
and hot water
Central heating
Instalation
type
Electronic
control panel
Basic
control panel
New installation Existing installation
Instalation
type
New installation Existing installation
Control panel
Instalation
type
Electronic
control panel
Basic
control panel
New installation Existing installation
Instalation
type
New installation Existing installation
Note:
These installation samples should not be used as the detailed installation plan. Before
installation observe the local regulations.
3.4. Installation site
3.4.1. Position of a boiler
The location must provide adequate space for servicing and air circulation around the boiler. The
boiler may be installed in any room, although particular attention is drawn to the local regulations in
respect to the installation of a boiler in a room containing a bath or ashower. The boiler must be
mounted on a flat, vertical wall, which must be sufficiently robust to bear the weight of the boiler. The
boiler may be installed on a combustible wall, subject to the requirements of the Local Authorities and
Building Regulations.
Thermo-Extra-
eAppendix - 2
Thermo-BlokPTV-
mAppendix - 3
or
Thermo-Extra-m
Appendix - 4
Thermo-Extra-
mAppendix -
4
Thermo-Blok-
eAppendix - 5
or Thermo-Extra-e
Appendix - 6
Thermo-Extra-
eAppendix - 6
or
Thermo-Extra -m
Appendix - 8
Thermo-Blok-
mAppendix - 7 Thermo-Extra-
mAppendix - 8
Thermo-Blok PTV-e
Appendix - 1
or
Thermo-Extra-e
Appendix - 2

Page 16
Following figure showsthe recommended minimal distances.
Minimal distances
It is possible to reduce recommended minimal distances, but the following requirements must be met:
Power supply connection, located at the left bottom side of boilers must be accessible
Bottom part of boiler must be accessible to allow change of heater
Control panel on bottom side of boiler must be accessible
Basic air circulation must be maintained
3.4.2. Power supply
The boiler is rated as a high-power appliance and fixed wiring must be used. Please observe chapter
2.4. about fuse and conductor requirements. When connecting the appliance to the fixing wiring the
means for disconnection (MCB) must be incorporated in fixed wiring in accordance with the local
wiring rules.
Note:
In some cases, additional measures must be taken, subject to the requirements of the Local
Authorities.
Note:
In some cases additional measures must be taken, subject to the requirements of the Local
Authorities.
3.5. System requirements
3.5.1. Pipe work
Pipe work that is not a forming part of the useful heating surface should be insulated to help prevent
heat loss and possible freezing, particularly where pipes are run through roof spaces and ventilated
under floor spaces. Draining taps must be located in accessible positions, which permit the draining of
the whole system including the boiler and the hot water system. All capillary joints in all DHW pipe
work must be made with lead free solder.
The house installation to which this device is
connected must contain an electric differential
protection switch (RCCB), which must be protected by
the device itself. Also, the device must be protected
from electrical overload and short circuit by selecting
an element from the table in Chapter 2.4.

Page 17
3.5.2. Cleansing and flushing the system
Flushing of system is highly recommended, this will prevent damage to the appliance made by dirt
from the system.
Particularly where a new boiler is to be fitted to an existing system, it is a good practice that
the system is thoroughly cleansed.
To prevent the formation of deposits and to prevent serious damage to the appliance and system,
cleansers must be used carefully and must be completely removed by thoroughly flushing the system.
Cleansers should only be left in systems for the maximum of 24 hours.
3.5.3. Filling and preparing heating system
A pressure relief valve is provided with the boiler. This safety device is required on all sealed C.H.
systems and is preset at 2.5 bar and provided with a 15 mm compression connection for a discharge
pipe, which must be of no less than 15 mm in diameter. The pressure relief valve must not be used for
draining purposes.
3.5.5. Expansion vessel
ThermoExtra boilers are not equipped with an expansion vessel.
3.5.6. Circulating pumps
A circulation pump is not included in ThermoExtra boilers.
On the electrical switchboard mounted inside of ThermoExtra boilers, there are terminals prepared
to pump connection (CH pump and/or DHW pump). See electrical diagram for more details.
The system can be filled using the built-in filling valve or via a separate filling point fitted at a
convenient position on the heating circuit. The connection must be removed when filling is completed.
Where local Water Authority regulation does not allow temporary connection, a sealed system filler
pump with break tank must be used. The heating system will not be filled automatically from the
domestic hot water side.
Note:
For the heating system to operate properly the indicator of manometer must be between 1.2
and 1.5 bar when system is cold. It is very important to use soft water or fluids for central
heating.
Do not fill the system with water from private source.
3.5.4. Pressure relief valve

Page 18
4. Boiler installation sequence
4.1. Transporting the appliance
Important:
The following lift operation exceeds the recommended weight for a one-man lift.
General recommendations when handling
Clear the route before attempting the lift. Safe lifting techniques are used – keep back straight – bend
using legs. Keep load as close to body as possible. Do not twist – reposition your feet. If 2 persons are
performing the lift, ensure coordinated movements during lift. Avoid upper body/top heavy bending -
do not lean forward/sideways. It is recommended to wear suitable cut resistant gloves with good grip
to protect against sharp edges and ensure good grip. Always use assistance if required.
Positioning of Appliance for Final Installation
Fit bracket securely onto wall before lifting appliance into position. Ensure that stable balance is
achieved and lift upwards to drop into place onto bracket. Ensure coordinated movements during a
two-person lift to ensure equal spread of weight of load It is recommended to wear suitable cut
resistant gloves with good grip to protect against sharp edges and ensure good grip when handling
appliance.
4.2. Select position for boiler
Refer to chapter 3.4.1. for information regarding the appliance position. In general, the boiler must be
positioned in such manner that:
There is enough space around the boiler for service and maintenance
There is no chance for boiler to be submerged into water
There is no chance for boiler to be poured with significant amount of water
Normal level of air circulation can be maintained
All necessary pipe work can be connected
4.3. Fitting the boiler hanging bracket
Fix the hanging bracket (2) to the wall (1) using the plugs and M8 or M10 screws. Lift up boiler (3)
above hanging bracket (2), gently lean it to the wall (1) and slide it down to the hanging bracket (2).
Wall mounting
Note:
If the boiler is to be fitted in a timber framed building ensure that the bracket is secured to a
substantial part of the timber frame capable of bearing the weight of the boiler.

Page 19
4.4. Removing/fixing the front and top case
Grasp the front case by its sides, pull it towards the front and remove it by lifting it of the unit, push top
cover towards back and lift it of the unit.
4.5. Pipe work connection
Note:
Observe chapter 3.5. for the system requirements before proceeding.
System flushing is necessary in order to prevent damage to appliance.
It is recommended to fit valves on flow and return pipe work in order to enable easy
disconnection/separation of boiler from the central heating system.
The following figure indicates flow and return for the central heating on ThermoExtra boilers.
Flow and return on ThermoExtra boilers

Page 20
4.6. Power supply connection
Note:
Before working on the boiler, turn off the power (e.g. MCB, switches) and secure
against accidental switching on. Tightening torque for MCB is 2.0 Nm.
A boiler is rated as a high power appliance and fixed wiring must be used. Please observe
chapter 2.4. about fuse and conductor requirements. When connecting the appliance to the
fixing wiring, the means for disconnection (MCB) must be incorporated in fixing wiring in
accordance with the local wiring rules.
This device must be earthed.
Power connection (main power terminals):
Note:
The power cable of the intersection from Ø6 mm to Ø21 mm must be
connected with the bottom of the boiler, with the help of a special
introducetor (located on the boiler).
All wires inside the electrical connection place must be tighted.
Pay attention when connecting the power cable so that the phase conductor is not
mistakenly connected to the remote shunt release marked by "-KF11", to the right of the MCB.
Connection way to the main power terminal may be vary depending on
elements installed inside the boiler.
Thermo Extra 28 - 42kW Thermo Extra 44 -96kW