TERMOSTROJ TERMO-Kombi User manual

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TMS-UT-0709-Z07-5
ELECTRIC BOILER FOR CENTRAL HEATING
AND WARM WATER PREPARATION
TERMO-Kombi
USER’S INSTRUCTIONS

We reserve the right of changing these instructions without special prior notification
TMS-UT-0709-Z07-5
WE ARE NOT LIABLE FOR
DAMAGES RESULTING
FROM NON-OBSERVING
THESE INSTRUCTIONS
Safety information and warnings
•Keep these instructions in the vicinity of
the boiler!
•The boiler is not allowed to modify.
•Adjusting correctly is important for
economical heating.
•At each contact with the manufacturer or
authorized service call to the factory-a
number that is printed on the identification
label on the boiler.
Children in the household!!!
- Please supervise children who are
retained in the vicinity of the device. Do
not allow children to play with the device.
- User cleaning and maintenance may not
work children unattended.
- The boiler is not intended for the
installation in the open air.
Technical security!!
- Keep the water pressure in the boiler
according to the manufacturer's
recommendations-see section 3.2.
- Do not mount the boiler in the vicinity of
sources of heat (open fireplace, wood stove,
etc.).
- Improper repairs can cause a serious danger
to the safety of the user.
- Defective parts may be replaced only with
original or approved by the manufacturer.
- Turn off the main power before opening or
any work on the boiler.
- The boiler has a built-in protection against
frost damage. If the boiler in winter period
does not use mandatory should be left active
main power (boiler can be turned off on the
control panel) so that the protection was
active.
TERMOSTROJ d.o.o.
10250 ZAGREB – LUČKO, F. Puškarića 1d, PP31
Tel/Fax [phone]
[e-mail]
http://www.termostroj.com
Table of contents
1. Introduction..............................................................1
2. About the product ....................................................1
2.1. Construction .....................................................1
2.2. Integral parts of the TERMO-Kombi Boiler ......2
3. Installation ...............................................................3
3.1. Important warnings...........................................3
3.2. Assembly..........................................................3
3.2. Assembly (Continued)......................................4
3.3. Connection to the power network ....................5
3.4. Connection of room thermostat........................5
4. Use of the product...................................................6
4.1. Use of the boiler ...............................................7
4.2. Manipulation with automatic equipment...........8
4.4. Recommendations for optimal use ................10
5. Maintenance..........................................................10
6. Survey of possible defects and irregularities in
operation ...................................................................11
7. Technical specification ..........................................13
Read this document carefully before
manipulation, any installation, setup,
or service, and follow the instructions

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TMS-UT-0709-Z07-5 1
1. Introduction
Thank you for the confidence you have shown to us
by having purchased our boiler for central heating and
sanitary water preparation.
For correct and safe and above all economic use
of the product, before assembly and connection,
read thoroughly these instructions.
Packing contains the following elements: boiler (1),
suspension support (3), user’s instructions and letter
of guarantee (3), valve for filling and emptying (4),
impurities collector (5), plastic pipe for venting the
system.
The Termo-Kombi boilers meet any and all national
regulations and legal standards. Pursuant to the
mentioned before, the certification of the product was
done according to the valid EN and HRN standards.
You can take insight into the certificates at the point of
sale, authorized service or web sites:
http:/www.termostroj.com.
The firm Termostroj is certified by the quality system
pursuant with the standard ISO 9001:2000.
Illustration of unpacked product
2. About the product
TERMO-Kombi is the economic boiler for central
heating and sanitary water preparation that may be
used as the independent source of heat.
The boiler is operated on the principle of rapid heating
smaller water quantities and its energy exploitation is
almost 100%
TERMO-Kombi is suitable for using in smaller
business premises, flats, smaller catering objects etc.,
where it is important that it takes up small space.
Temperature range of operation is for sanitary water
from 30oC up to 55 oC, for central heating from 30oC
up to 90 oC.
Because of its design and noise free operation, the
TERMO-Kombi may easily fit in the living space. The
outer metal sheet is protected by powder coating.
2.1. Construction
The electric boiler TERMO-Kombi is made of quality
boiler metal sheet. The boiler itself is upon welding
sandblasted and protected with quality reactive
fundamental color.
At the bottom side of the boiler there are built in
electric heaters. From the upper side there is the blind
tube for placing the sounding tube of capillary
thermostat, temperature, pressure and thermal fuse
indicator. The boiler is insulated with 19 mm self-
extinguishing insulating material, which is sufficient to
direct all the heat only to the heating and sanitary
water preparation system.

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TMS-UT-0709-Z07-5 2
2.2. Integral parts of the TERMO-Kombi
Boiler
1. Central heating primary flow
2. Central heating return flow
3. External shell of the boiler
4. Boiler
5. Thermal insulation
6. Electric heaters
7. Control panel
8. Boots for el. terminals
9. Contactors
10. Expansion vessel
11. Central heating pump
12. Safety valve at 3 bar
13. Automatic venting valve
14. Filling and emptying valve (in packing, it should
be built in at installation)
15. Valve for boiler venting
16. Sounding tube for air appearance control
17. Distributor
18. Miniature circuit breaker (MCB)
19. Temperature sensor of sanitary water outlet line
20. Exchanger
21. Temperature sensor of sanitary water inlet line
22. Non-return valve
23. Pump for sanitary water preparation
24. Sanitary water intake
25. Sanitary water output
26. Safety valve at 8 bar
27. Automatic venting valve
28. Boiler’s temperature sensor

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TMS-UT-0709-Z07-5 3
3. Installation
3.1. Important warnings
THE GUARANTEE SHALL
NOT BE ACCEPTED IF THE
FOLLOWING WAS NOT
OBSERVED:
•THE BOILER SHOULD BE PUT INTO
OPERATION BY THE AUTHORIZED SERVICE,
•THE ENCLOSED IMPURITIES COLLECTOR
SHOULD BE BUILT IN ON THE STARTING LINE
OF CENTRAL HEATING AND INLET COLD
SANITARY WATER,
•PRIOR TO CONNECTING THE BOILER TO THE
SANITARY WATER LINE, PIPES SHOULD BE
CLEANED IN ORDER TO AVOID THE
BLOCKAGE OF THE EXCHANGER.
THE LIST OF AUTHORIZED SERVICES IS ON THE
BACK OF THE LETTER OF GUARANTEE
THE BOILER SHOULD NOT BE INSTALLED ON
PLACEC WHERE THERE IS A DANGER OF BEING
PORING OVER WITH WATER OR A DANGER OF
SINKING.
IN AREAS WITH STRONG CONCENTRATION OF
LIME IT IS RECOMMENDED TO BUILD IN A
MAGNETIC OR ELECTROMAGNETIC LIME
BREAKER ON THE INLET LINE OF SANITARY
WATER ON THE BOILER.
3.2. Assembly
TERMO-Kombi is foreseen for the wall assembly and
for the easier assembly, on the backside there is
foreseen the suspension support. For the suspension
you may use metal wall plugs with the screw M8 or
M10 or stronger plastic wall plugs – diana screws.
Precise dimensions of boilers are given in the 7.
Technical specification
Filling and emptying valve is delivered together
with the boiler and should be assembled at the
installation.
If possible, the boiler should be assembled to the
lowest point in relation to installation. In this way we
are protecting the boiler from air appearance, which
may leave heaters without water that could result in
their burning through.
Minimum distances at assembly
Disassembly schema

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TMS-UT-0709-Z07-5 4
3.2. Assembly (Continued)
Prior to putting into operation, the system should
be vented and that both central heating and
sanitary water circle.
Illustration of how to correctly vent the water circle on
upper side of Termo-Kombi. Protection cap should be
release on automatic venting pots (1 and 2). Plastic
pipe should be attached to valve (3) prior venting the
water circle.
On the illustration you can see: ground terminal (1),
neutral wire terminal (2), MCB (miniature circuit
breaker) (3), operating current trips (4), relays /
contactors (5) and connection plate (6) for connecting
pumps, room ‘stat and all probes.
Upper side of Termo-Kombi
Connection terminals

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TMS-UT-0709-Z07-5 5
3.3. Connection to the power network
For power supply connection on all Termo-Kombi
boilers, MCB (miniature circuit breaker) is used,
providing same time protection for boiler and
connection point for external power cables.
Note:
When connecting power cable please observe live
and neutral marks inside boiler.
3.4. Connection of room thermostat
The TERMO-Kombi boiler has foreseen clamps for
connecting the room thermostat.
The short circuit is factory installed on the clamps (for
cases when the room thermostat is not used) and if
we connect it, we have to take account of the fact,
which type of a room thermostat is to be connected.
One group of thermostats is connected only serially in
the control voltage circuit, resp. on clamps.
The other group of thermostats has built in
temperature simulation system and therefore should
be constantly under voltage and according to the fixed
temperature in the room, on its outlet we have the
signal for boiler control. In this case the ZERO-line is
connected to the clamp “N”.
Read instructions for connection of a thermostat,
which are enclosed to the thermostat in order to
learn which way of connection is laid down by the
producer.
Power supply connection
Room thermostat terminal

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TMS-UT-0709-Z07-5 6
4. Use of the product
Control panel
1. Multipurpose – temperature indicator (temperature of
boiler, sanitary water, adjustment of temperature)
2. Signalization of operation degree of heaters (1., 2., 3.)
3. Signalization of air appearance in the boiler (red light)
4. Signalization of under voltage protection (red light)
5. Signalization of boiler operation (green light)
6. Adjustment of temperature in boiler
7. Switch for central heating switching on and off
8. Sanitary water temperature adjustment
9. Switch for switching on and off the sanitary water
preparation
10. Signalization of sanitary water preparation and
consumption
11. Indicator of pressure in a boiler
12. Thermal fuse

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TMS-UT-0709-Z07-5 7
4.1. Use of the boiler
First putting on at the beginning of a season
For the first putting on at the beginning of a central
heating season, the first step should be to put on the
boiler by means of the switch for central heating (7),
temperature in the boiler (1) should be adjusted to
30°C (in this was the heaters are disconnected and
only circulation pump is in operation).
Warm water preparation is put on by means of the
switch for sanitary water (9)
If upon putting on the boiler there is no noise of water
or the central heating if warm water pump does not
run (during operation, the pump produces slight
vibrations) the pump should be manually started.
Circulation pumps lubricate bearings with water
flowing through the pump and after stoppage it could
occur that the bearings “burn”.
Starting the pump
For starting the pump it is necessary to turn off the
protection plug on its front side (1) below which there
is the axis with the groove for screwdriver. With the
screwdriver, the pump (2) should be several times
turned in direction of the arrow on the pump head and
the boiler should be put on again.
When the pump starts, the operation temperature of
water in boiler and temperature of sanitary water
should be selected. For central heating the optimal
temperature is between 60 and 70°C, whereas for
sanitary water optimal temperature ranges from 45 to
48°C.
If to the boiler a room thermostat is connected, a
desired room temperature should be adjusted
according to the instructions of the producer of room
thermostat.
Segment of control panel

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TMS-UT-0709-Z07-5 8
4.2. Manipulation with automatic
equipment
Putting on and of the sanitary water preparation
The boiler is switched on by means of the main switch (9),
for switching on, the switch should be put in the position 1.
Upon switching on a desired water temperature in boiler is
displayed for 5 seconds, signalization of sanitary water
preparation is twinkling (10). Upon 5 seconds real
temperature of sanitary water outlet is displayed (1); if there
is no requirement for sanitary water, the signalization lamp
of sanitary water preparation (10) is switched off.
By switching the switch (9) to the position 0, the sanitary
water preparation is put off. The entered desired
temperature of sanitary water shall be stored.
Adjustment of desired temperature of sanitary water
By pressing the key for temperature adjustment (8) the
desired warm water temperature appears, the signalization
lamp of sanitary water preparation (10) is twinkling. By
repeated pressing upwards or downwards it is possible to
increase or decrease the desired sanitary water
temperature. When the temperature is adjusted it is
sufficient to wait for 5 seconds (signalization lamp of
sanitary water preparation (10) does not twinkle) in order
that the boiler memorizes a new temperature.
Use of sanitary water
If there is a need for sanitary water, the signalization lamp of
sanitary water preparation turns on (10) and the
temperature of warm water outlet displays. Signalization of
operation degree of heaters (2) displays and by turning on
lamps it is shown whether one group of heaters is in
operation, two or all three groups.
The boiler automatically controls a heater operation degree.
Putting on central heating
By switching the switch (7) to the position 1, the central
heating system is switched on. Upon switching on a desired
water temperature in boiler is displayed for 5 seconds,
signalization of boiler operation is twinkling (5). Upon 5
seconds real temperature in the boiler is displayed (1); if the
current temperature in boiler meets the desired one, the
signalization lamp of boiler operation (10) is switched off.
Adjustment of desired temperature of central heating
By pressing the key for temperature adjustment (6) the
desired temperature in the boiler appears, the signalization
lamp of boiler operation (5) is twinkling. By repeated
pressing upwards or downwards it is possible to increase or
decrease the desired sanitary water temperature. When the
temperature is adjusted it is sufficient to wait for 5 seconds
(signalization lamp of boiler operation (10) does not twinkle)
in order that the boiler memorizes a new temperature.
Segment of control panel
Segment of control panel

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TMS-UT-0709-Z07-5 9
Parallel operation of central heating and sanitary
water
When both modes of operation are active, central
heating and sanitary water preparation, the boiler
prefers sanitary water.
If there is a requirement for warm water, the boiler
starts with preparation of sanitary water, the lamp (10)
turns on, whereas the boiler operation signalization
turns off (5); temperature indicator (1) displays the
current temperature of warm water outlet.
Air in the boiler (3), red light
If in the boiler the air appears, the signalization of air
in the boiler turns on (3) and the boiler stops the
operation. In this way the boiler is protected against
blowing because of appearance of air. For
continuation of operation, the boiler should be vented.
If the boiler is correctly vented, the operation of boiler
continues automatically.
Voltage drop (4), red light
If the voltage in the network line drops below 175V by
phase, the signalization of under voltage protection (4)
turns on, the boiler automatically switches off in order
to protect electronics and contactors inside the boiler.
The boiler shall automatically continue the operation
when the network voltage reaches values above
185V.
Thermal fuse - turning on
By means of thermal fuse (12) the boiler is protected
against rapid increase of temperature above 115°C.
The fuse turns off the boiler and ejects the MCB
(miniature circuit breaker).
For continuation of operation it is necessary to take off
the protection cover from the thermal fuse and press
the white key, upon which the MCB should be
switched on again.
*If the temperature of water inside the boiler exceeds
90°C, the thermal fuse can not be reset. In order to
reset the thermal fuse, it is necessary to wait for the
water temperature to drop below 90°C.
Segment of the control panel
Segment of the control panel

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TMS-UT-0709-Z07-5 10
4.4. Recommendations for optimal use
Central heating
For optimal use of the boiler and electric power
consumption, we recommend the use of quality room
thermostat connected to the boiler.
Daily temperature should be between 20°C i 22°C (for each
degree above 22°C the consumed energy is increasing
exponentially).
For the night operation we recommend temperature
between 15 i 17 °C. In this way energy saving is higher than
in case of complete turning off the boiler during the night.
If there is no room thermostat, for night operation the
temperature in boiler should be decreased to about 40°C or
turned off completely (9. main switch).
In summer period, valves below boiler should not be
closed (closing valves disables water circulation in
system (10 – 15 seconds) generated by safety
thermostat.
Warm water
Optimal temperature of sanitary water, in boiler, is 42°C up
to 45°C (above 48°C it comes to increased lime separation
that sticks to the exchanger, tubes and pump and may lead
to gradual decrease of boiler effect).
5. Maintenance
We recommend the inspection of a device once a year by
the authorized service (before heating season). This service
is not included in the guarantee. During the inspection all
electric and water connections should be tightened, the
system should be vented and – if necessary – filled up,
valves and general functionality of the device should be
checked.
If you notice a reduced effect of warm water it is necessary
to remove lime accumulated within the plate exchanger (1).
Only authorized service engineer can do removing lime.
Prior to the beginning of cleaning, valves (2) separating
the boiler from the sanitary water installation, should be
closed.
Cleaning tubes should be connected to the foreseen 1/2"
piping (3) (internal thread).
Cleaning solution (5) may be formic acid 2-3%, nitric acid 3-
4% or acetic acid 10%.
The solution should circulate through the system by a pump
(4), as long as there is the sludge in the outlet pipe.
Thereupon the direction of a circulation should be changed
and the process repeated.
Upon finished cleaning the boiler should be washed in
the same way with clear water.
For cleaning the product, it is not permitted to use
aggressive media as e.g. gasoline, kerosene or solvent. For
the external shell and decorative cover media for cleaning
plastics or dish washing media may be used. Control panel
should be cleaned with dry or moist cloth (not wet).
Schematic illustration of lime removal

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TMS-UT-0709-Z07-5 11
6. Survey of possible defects and irregularities in operation
DEFECT CAUSE ELIMINATION
- at switching on, no voltage on
the control panel
-no feed from net on one or
more phases
-fuse 2,5A on the control
panel blown
-MCB (miniature circuit
breaker) ejected
-check on serial clamps of
the boiler whether there is
feeding
-replace the fuse 2,5A and
check the cause of its
blowing
- at switching on, switches
show voltage on the control
board, but the boiler does not
heat
-check the adjustment of a
room thermostat,
-limit thermostat was
activated,
-indicator of air appearance
in the boiler blocked the
operation,
-defective contactor,
-defective operation
thermostat,
-blown heaters
-check the adjusted
temperature on a room
thermostat, replace its
batteries or it is defective,
-vent the boiler till the lamp
“air in boiler”, turns off
- temperature in boiler is at the
desired value, but the radiators
are not warm
-circulation pump is not in
operation,
-air blockage on central
heating installation, that
prevents the circulation
-start the mechanical pump
or replace it with the new
one if it is blown (see 4.1.),
-vent the installation
- the boiler heats poorly
-on the feed one phase is
missing,
-in two-phase thermostats,
second phase is not in
operation,
-second or third phase was
not manually turned on,
-one contactor defective,
-a part of the heater has
blown,
-in three-phase system to
the boiler are not brought
three various phases
-check fuses on the main
panel,
-replace thermostat or, if
necessary, contactor,
-replace the heater,
-measure with the
instrument voltage between
phases, it should be 400V
- in the operation the contactor
can be heard (it is buzzing) and
possibly radio and TV-
interferences
-poor voltage in the network,
-defective contactor
-select with the instrument
the best phase for control
(on the boiler marked with
“R”)
-replace the contactor
- at switching on or off the
operation thermostat radio and
TV-disturbances
-defective operation
thermostat,
-defective blockade (RC –
protection)
-replace the thermostat,
-replace the RC – member
- boiler in operation is roaring
-a system is not good
vented,
-defective heater
-vent the system,
-replace heaters

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TMS-UT-0709-Z07-5 12
- pressure in heating system is
varying
-defective expansion vessel,
-too low or too high pressure
in the vessel
-if there is water on the valve
for pumping the vessel,
replace the vessel,
-pressure in the vessel
should be 0,5 – 0,8 bar
-RCCB switch is ejecting
-defective heater,
-moist on conductors,
-replace the heater,
-check leaking,
-check the cause of
activation
- sanitary water temperature is
varying
-too low pressure or too
small flow in plumbing
installation
-set the warm water
temperature to the desired
temperature without mixing
with cold water
- boiler does not reach a
desired warm water
temperature
-check network fuses
-warm water flow is higher
than boiler capacity
-check in the instructions the
maximum warm water flow
- boiler does not warm up a
water
-pump for warm water
preparation is not in
operation
-air in warm water system
-start the pump manually
according to the instructions
in 4.1.
-vent the warm water system

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TMS-UT-0709-Z07-5 13
7. Technical specification
1. Central heating return line
2. Sanitary water inlet line (cold water)
3. Valve for venting the boiler
4. Central heating starting line
5. Sanitary water outlet line (warm water)
6. Control panel
7. Wall support for suspension
8. Safety valve at 3 bar
9. Safety valve at 8 bar
10. Power and room thermostat inlet
11. Filling valve
TERMO-Kombi Boilers
Type of the device
Characteristics
Units TERMO
Kombi 15
TERMO
Kombi 18
TERMO
Kombi 24
TERMO
Kombi 28
TERMO
Kombi 32
TERMO
Kombi 40
Central heating heat effect
kW
15
18
24
28
32
40
Warm water heat effect
kW
15
18
24
28
32
40
Max. pump supply at 1000 lit/h
m
4,8
Area of central heating temperature
adjustment
oC 40 - 90
Area of warm water temperature
adjustment
oC 30 - 55
Warm water flow at 2 bar
l/min
6,1
6,8
8,5
9,3
10,2
11,50
Warm water flow at 2 bar and 55oC
l/min
2,85
3,10
4,00
4,62
5,10
5,8
Specific flow (at ΔT - 30 K)
l/min
10,2
11,2
12,80
13,30
13,96
15,6
Permitted overpressure, warm water
bar
8
Height
mm
930
Depth
mm
290
Width
mm
480
550
Weight
kg
58
65

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TMS-UT-0709-Z07-5 14
TABLE OF RECOMMENDED FLOWS
Power range
[kW]
Minimum flow
[l/min]
Optimal flow
[l/min]
Maximum
flow
[l/min]
Recommended
work area
[l/min]
15 820 40 10-35
18 13 26 52 15-40
24 15 34 68 15-55
28 20 40 80
25-70
36 20 45 92
25-80
40 25 57 115
30-100
SUPPLY CHARACTERISTICS
The boiler must be protected by Residual current circuit breaker (RCCB) and appropriate
fuse or MCB (miniature circuit breaker). See table “SUPPLY CHARACTERISTICS”.
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
15 kW 21,73 A 25 A
10 kA 15 kA
5 x 6 mm2
B25-3p
40 / 0,03 A18 kW 26,09 A 32 A B32-3p
24 kW 34,78 A 40 A B40-3p
28 kW 40,58 A 50 A
5 x 10 mm2
B50-3p
63 / 0,03 A32 kW 46,38 A 63 A B63-3p
40 kW 57,97 A