Kober C33GC24 User manual

USER MANUAL
CENTRAL HEATING GAS BOILER
C33GC24
Image for presentation only.
Product may look slightly
different depending
on the area and the
purchase period.
KÖBER SRL VADURI BRANCH
KÖBER SRL, Vaduri no.25, Alexandru cel Bun commune, Neamt 617511,
Romania
Tel.:[phone],Fax:[phone] www.motan.ro

© KÖBER SRL VADURI BRANCH 1
USER MANUAL C33GC24
Content
1 Safety instructions and symbols
2 Valability of instructions
3 EC Marking
4 Use according to destination
5 Safety instructions
5.1 Installation and adjustment
5.2 Gas smell
5.3 Changes in the area adjiacent to the heating station
6 Technical and functional characteristics
7 Mounting
7.1 Mounting set
7.2 Dimensions and mounting positions
8 Intallation
8.1 Conditions for the installation of the central heating station
8.2 Gas connecting pipe
8.3 General directions for the heating installation
8.4 General directions for the hot water circuit
8.5 Connecting pipe of the condensation output duct
8.6 Connecting pipe of the safety valve
8.7 Air inlet pipe / burnt gases outlet pipe
8.8 Electric grid connection
8.9 Filling and emptying the heating circuit
9 Operation instructions
9.1 Control panel
9.2 Description of control panel
9.3 Choosing the functioning modes of the station
9.4 Functioning as waste hot water station
9.5 Functioning as heating station
9.6 Preset functions related to station safety
9.7 Error signals
9.8 Boiler switch off in safety conditions
9.9 User training
9.10 Quality conditions and warranty
10 Inspection and maintenance
10.1 Inspection and maintenance intervals
11 Drawings necessary for mounting and installation
11.1 Types of configurartions for the mounting kit for air input/ burnt gases output
11.2 Minimum distances recommended for the mounting of the co-axial kit
11.3 Hydraulic characteristic of pump
11.4 Functioning schemes covered by warranty
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1 . Safety instructions and symbols
2. Valability of instructions
These instructions are valid exclusively for central heating BOILER type C33GC24.
3. EC Marking
EC marking applied on this product guarantees that the equipment complies
with the esential conditions stipulated in the applicable European legislation:
- Directive regarding gas equipment 2009/142/CE (ex. 90/396/CEE)
- Directive regarding energy efficiency 92/42/EEC
- Directive regarding electromagnetic compatibility 2004/108/EC (ex. 89/366/CEE)
- Directive for low frequency 2006/95/EC (ex. 73/23/EEC).
4. Use according to destination
- Central heating boilers C33GC24 are designed following current technical
standards and observing recognized safety norms;
- In case of misuse or inappropriate use, the health or life of users or third parties
can be put in danger, as well as the central heating BOILER and other goods;
- This equipment must not be used by people with limited psychological and
sensitive capacities (including children), or by people with no experience or/ and no
knowledge;
- The BOILER provides both heating in closed circuit central heating installations, as well
as hot water. Use for other purposes or for additional purposes other than stipulated is
considered inappropriate use. The manufacturer is not responsible for possible damage
resulting from inappropriate use. The user is the only one responsible;
© KÖBER SRL VADURI BRANCH 2
When installing the central heating BOILER we ask you to respect the safety instructions
contained in this manual!
This manual is the property of KÖBER SRL-Vaduri branch. Copying or reproduction without
written consent KÖBER SRL-Vaduri branch is strictly forbidden.
The following lines explain the symbols used in the text:
Danger! – direct danger for corporal integrity and life;
Danger! – danger of death by electrocution;
Caution! – pontentially dangerous situation for the product and the
environment;
Note! – useful notes and information. This symbol indicates a necessary
activity;
EN
USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 3
5.2 Gas smell
When gas smell appears, take the following into account:
-Do not activate electric switches in the dangerous zone;
-Do not smoke in the dangerous zone;
-Do not use mobile phones in the dangerous zone;
-Turn off the gas tap;
-Air the dangerous zone;
-Notify the gas distribution company.
5.3 Changes in the area adiacent to the heating BOILER
Modifications of the following installations are not allowed:
-The central heating BOILER;
-The gas or water pipes or electric cables;
-Air/ gas incoming/ outgoing pipes.
- Compliance with the use and installation instructions, the additional documentation, as
well as with the inspection and maintenance stipulations is part of what is understood by
use according to destination.
5. Safety instructions
5.1 Instalation and adjustment
Installation and commissioning can be done only by a company authorized and agreed
by KÖBER SRL-Vaduri Branch!
This company will assume responsibility for the correct installation and commissioning.
Adjustment work, as well as maintenance and repair are allowed to be performed only
by a company authorized and agreed by KÖBER SRL-Vaduri Branch!
Danger!
Danger of death by poisoning and explosion because of breeches in the gas
pipes and connections in case of incorrect installation!
Danger of deterioration when inappropriate tools are used. For tightening or
unscrewing connection screws use appropriate wrenches (no box wrenches,
extensions etc).
EN
USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 4
6. Technical characteristics
Tab.1 Technical characteristics
Type
Commercial name
Efficiency stars (dir. 92/42/CEE)
Gas category to be used
Maximum useful power - thermal (kW)
Maximum pressure on the thermal circuit
Temperature adjustment interval of thermal circuit
Temperature adjustment interval of thermal circuit -
floor heating system
Maximum pressure on the hot water circuit
Temperature adjustment interval of the hot water circuit
Hot water flow at Δ t = 30 °C
Flue type
Minimum useful power (kW)
Gas pressure (on the regulator)
Nox class(natural gas)
Height (mm)
Width (mm)
Depth (mm)
Height with installed elbow
Weight
Primary heat exchanger capacity
Expansion vessel with membrane
Evacuation type
Power
Nominal power
Flue gas temperature
Connectors Thermal input, output
Cold water input, hot water output
Gas input
Class of electric protection
Constructive characteristics
Efficiency at 100% useful power
Efficiency at 30% useful power
Electrical characteristics
C C C C C C C C
13 , 23 , 33 , 43 ; 53 ; 63; 73; 83
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USER MANUAL C33GC24
C33GC24
SIGMA KDENS24
****
II2H3B/P
24 kW
0,8÷3,5 bar
0,2÷8bar
30÷80 °C
15÷45 °C
35÷55 °C
10 l/min
7.5 kW
20 mbar
5
forced; condensing boiler
700
436
303
850
40 kg
1 l
3/4 ''
1/2''
3/4''
7 l
90 W
Coaxial D100/D60
Dual D80
Coaxial - maxim 3m
Dual - maxim 5m
~230V/50Hz
IP 40
~62 °C
97%
106%

© KÖBER SRL VADURI BRANCH 5
7. Mounting
7.1 Mounting set
Check whether the mounting set is complete and undamaged – see table 2.
Tab. 2 Mounting set
Pos. Pcs. Description
1
2
3
4
1
1
1
1
Boiler
Boiler support
Mounting screws 8x80 - 2 items
Printed packet – it contains:
- user manual - 1 item
- conformity statement - 1 item
EN
USER MANUAL C33GC24
3
4
Fig.1.1

© KÖBER SRL VADURI BRANCH 6
7.2 Dimensions and mounting positions
7.2.1 Installation site
When choosing the installation site, please take into consideration the following safety
instructions:
Caution!
Do not install the BOILER in spaces that are exposed to freezing! In case of
freezing the sation can be damaged.
This equipment can not be installed and used in open air. Outdoor installation can cause
functioning flaws.
Caution!
It is not recommended to install the central heating BOILER in bathrooms or kitchens or
other areas with high humidity.
The BOILER can be installed only in rooms with maximum 60% humidity between 20-30°C
in order to prevent the damaging of electronic components.
Caution!
The burning air of the BOILER must not contain substances such as flourine
vapours, chlorine, sulphur, dissolvants, colorants, adhesives or gasoline. These
substances can lead in time to the corrosion of the equipment and air/ gas
incoming/ outgoing pipes.
Fig. 1.2 Dimensions and mounting positions
Legend:
A – Thermal input
connector
B – Hot water output
connector
C - Fuel input connector
D - Cold water input
connector
E - Thermal output
connector
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USER MANUAL C33GC24
Fig.1.2

© KÖBER SRL VADURI BRANCH 7
7.2.2 Minimum necessary distances/ free spaces for mounting
8. Installation
Danger!
Danger of death by poisoning and explosion because of breeches in the gas
pipes and connections in case of incorrect installation! Installation and
commissioning can be done only by a company authorized and agreed by
KÖBER SRL-Vaduri Branch! This company will assume responsibility for the
correct installation and commissioning.
Fig. 1.3
100 100
400
250
Both for the mounting/ installation of the central
heating BOILERS and for later maintenance
operations you will need the following minimum
distances (fig. 1.3), respectively minimum free
spaces for mounting:
– distance to the lateral: 100 mm
– distance to the bottom part: 250 mm
– distance to the upper part: 400 mm
– distance to the front part: 400 mm
8.1Conditions for the installation of the central heating BOILER
8.1.1 Installation indication
The central heating BOILER will be subject to corrosion from the moment it is filled with water!
To receive warranty during the entire warranty period it is essential to take into
consideration the following directions in order not to increase the corrosion!
- The burning gas must have the sulphur content within the limits of the applicable European
standard: it is accepted for a short period of time to have a maximum of 150 mg/m3, but the
yearly average must be of 30 mg/m3.
- The burning air must not contain chlorine, ammonia, alkaline agents, halogenated
hydrocarbs, freon, plaster particles, lints, dirt or dust;
- Installation of the central heating BOILER in the proximity of a swimming pool, washing
machine or cleaner can result in the contamination of the burning air with these
compounds.
- Water pH must be within the following limits: 7,5<pH<9,5
It is recommended to check the water and thermal agent pH frequently and if the value does
not fall within the limits provided by the manufacturer, it will be treated again.
- Water asperity must be within the limits 5°F <TH <15°F (5°F (French degrees), equivalent to
50 mg CaCO or an equivalent quantity of other Ca and Mg salts).
3
Caution!
Danger of damaging the equipment by
incorrect setting!
The equipment can be mounted only on
a flat, fixed surface.
Note!
Minimum necessary distances/ free spaces for mounting are valid also for
mounting with/ within pieces of furniture.
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USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 8
- It is recommended to have repeated BOILER startup cycles with the fuel tap off in order to
air the installation. The BOILER is also provided with a manual ventilator, installed on the heat
switch.
- If the central heating BOILER is not used for a long period of time during the cold season,
full emptying of the installation is recommended to prevent damage caused by freezing.
8.1.2 Protection of the boiler in order to keep the warranty
Before and during installation, the central heating BOILER must be kept away from
impurities: construction dust, sand, copper dust, fats etc as well as welding splashes,
scoria. In any of theses cases, the installation must be washed with clean water mixed with
a highly concentrated cleaning agent.
Genereally, in order to keep the warranty it is necessary to apply any neccesary treatment to
prevent the contamination of water with the following:
§Black mud (magnetite - Fe3O4) formed as a result of the continuous electrolyte corrosion
occurring in any installation which is not protected with an inhibitor.
§Red mud (rust - Fe2O3) produced during oxidation.
§Calcarous deposits produced especially on the hottest areas of the central heating BOILER.
A combination of these three factors mentioned above causes the majority of the problems
occurring with heating systems.
Caution!
The presence of these substances (black mud/ red mud/ calcarous deposits) means
that the standard measures to prevent problems of the heating system were not
observed.
This is one of the causes resulting in losing warranty!
Caution!
In case parasite voltage appears on the gas pipe, it can be insulated by installing
an electroinsulating piece (according to the Technical Norms for the planning and
execution of natural gas input systems).
8.2 Gas connectiong pipe
Danger!
Danger of death by poisoning and explosion because of breeches in the gas pipes
and connections in case of incorrect installation!
Installation of gas pipes is allowed to be performed only by an authorized agent.
During installation all legal stipulations, as well as the local regulations of gas
distribution companies are to be observed.
When installing the gas pipe it is essential that it is not tensed so as not to create
areas of leakage!
Caution!
Is is obligatory to istall a pressure regulator on the fuel input circuit, adjusted at 20
mbar.
Caution!
Maximum safety pressure for the gas valve is 60 mbar! Going above this pressure
limite may resul in damage.
Work pressure with G20 natural gas functioning must be 20 mbar!!
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USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 9
8.3 General directions for the heating installation
Caution! Before connecting the central heating BOILER carefully wash the entire
heating installation! In this way, you eliminate from the pipes various debris such
as welding splashes, scoria, grummet, putty, dirt or similar. Otherwise, these
substances can form deposits in the heating switcher and can cause damage
or malfunctioning.
The equipment is provided with a 7l capacity and 1 bar loading pressure expansion vessel.
Before installing the equipment, check whether this volume is sufficient. If not, an
additional expansion vessel must be installed on the aspiration side of the pump.
Caution!
Check the pressure inside the expansion vessel before commissioning.
Pressure inside the expansion vessel must be 0.8÷1bar.
8.4 General directions for the hot water circuit
Caution!
It is obligatory to install an impurity filter on the return of the thermal circuit
installation!
When installing connecting pipes it is essential for these not to be tensed to
avoid creating areas of leakage!
Maximum working pressure allowed is 3bar.
Recommended working pressure is 1.5 barr!
When designing the heating installation will take into account the hydraulic characteristics
of the pump fitted this model central ! See indications cap.11.3.
Caution! It is forbidden to use the central heating BOILER without thermal agent or
partilally filled – danger of explosion! It is forbidden to use the central heating
BOILER if it is not completely aired!
Central heating BOILERS C33GC24 function on GN natural gas The gas connecting pipe .
is made of stainless steel with an interior diameter of 12.4 mm. The gas input pipe must not
have a diameter smaller than that of the gas connecting pipe of the central heating
BOILER. The fuel input must be done according to applicable legal stipulations.
Connect the central heating BOILER to the hot water installation.
It is obligatory to install filters to de-harden the water and a mechanical impurity
filter on the cold water input connecting pipe!
Caution! When installing connecting pipes it is essential for these not to be tensed
to avoid creating areas of leakage!
The apparition of pressure shocks (input pressures higher than 3-4 bars in addition to
symoultaneously activating quick closing taps) can affect the components of the hydraulic
circuit inside the central heating BOILER. We recommend the installation of a pressure
regulator adjusted to 3-4 bars!
Damage caused by the apparition of pressure shocks or by the use of higher pressure than
recommended on the cold water input circuit is not covered by the warranty!
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USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 10
8.5 Connecting pipe of the condensation output duct
Danger of death by leakage of burning gases!
The condensation output duct must not be water-proof connected to a used
water pipe because otherwise the internal condensation seal box can be
emptied by aspiration and the burning gases can get inside the room where
the central heating BOILER is installed.
Th e co n de n sa ti o n r e sul t ing fr o m t h e
condensation of water vapours contained by the
burning gases is taken out of the BOILER by means
of the condensation output seal box (fig.1.5),
which is located in the lower part of the central
heating BOILER.
As this condensation is acid with a pH of
approximately 3.8÷5.4, the output must be done
by means of a plastic tube (flexible) with an
interior diameter of minimum Ø25 mm or larger,
which is connected at one end to the hose of
the seal box and at the other to a sewage pipe.
We recommend the installation of a pressure regulator! Damage caused by the use of pressure
higher than recommended on the cold water input circuit is not covered by the warranty!
It is forbidden to install one-way valves on the the cold water input circuit.
The cold water input pipe of the hot water preparation circuit will always be open (closing the
network is done only by activating the taps at the consumer points) to allow take-over of
possible dilatations on this circuit.
Note!
It is recommended that the distance between the hot water connecting pipe
of the central heation BOILER and the nearest conumer is minimum 6m of pipe.
Otherwiswe, there is always the risk of hot water burns.
Before commissioning the central heating BOILER approximately 1/4 liters of water must be
introduced by means of the burning gases output connecting pipe (fig. 1.4), to form a “water
plug” inside the seal box – in this way we prevent burning gases to be evicted in the room.
The route of condensation output must be continuously downwards (so as not to have
areas of condensation stagnation, especially in areas where there is the danger of
freezing). The route of the condensation output must respect the applicable norms
regarding residual waters.
Fig.1.4
1/4 liter
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USER MANUAL C33GC24
Fig. 1.5
Condensation
evacuation hose
Safety valve
connecting pipe
Condensation
pipe

© KÖBER SRL VADURI BRANCH 11
.
Caution!
Danger of hot water burns!
8.6 Connecting pipe of the safety valve
The connecting pipe of the pressing of the safety valve is connected to the drain pipe to the
sewage system. Otherwise, there is always the risk of flooding, for which the manufacturer of
the central heating BOILER is not responsable.
8.7 Air inlet pipe / burnt gases outlet pipe
Caution!
It is obligatory to place central heating BOILER in rooms with proper ventilation systems
according to applicable norms. Study the technical instructions before mounting/
installation, commissioning or maintenance or repair work.
Under no circumstances the total length of the co-axial kit, including elongations, is to
be longer than 3 m (without the first corner).
Under no circumstances the total length of the dual kit, including elongations, is to
be longer than 5 m (without the first corner).
The central heating BOILER does not require air plugs in the room where it is installed.
The air necessary for burning to ensure the efficient functioning of the central heating BOILER
is recommended to be taken from the outside of the building.
The equipment is delivered with a co-xial or dual type air input/ burnt gases output system
called an evacuation kit. The equipment is delivered with a standard co-axial evacuation
kit. On demand, a dual evacualtion kit can be delivered. It is also possible to order
additional 45° and 90° corners as well as 0.5m and 1m elongations for both the dual and
the co-axial systems.
Caution!
It is not allowed to mount the central heating BOILER with a defective
electric installation or with no earthing.
Danger!
It is completely forbidden to use the central heating BOILER without the burnt gases
output pipes because it endangeres people's life and health of people.
Replacement is to be performed only by authorized personnel following applicable
laws and using only original spare parts provided by the producer.
8.8 Electric grid connection
The central heating BOILER must be connected to one-phase network of 230V - 50Hz with
protection null.
Dispersion withstand of the earthing switch (earthing) must comply with applicable norms
(maximum 4 ohm, and the working null must not have residual current).
Electric powering of the central heating BOILER will be executed from a separate circuit
provided with differential protection fuses of 30 mA.
External connections must comply with applicable norms. Connection to the electric grid
of the building must allow the entire electric insulataion of the central heating BOILER for
situations when interventions are required.
Grid connection is done taking into account the symbolism of colours as follows: Brown =
phase, Blue = null, Green and Yellow = earthing.
The current plug must be accessible so that the user can easily disconnect it.
Danger!
Danger of death by electric shock with electric contacts!
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USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 12
8.9 Filling and emptying the heating circuit
Caution!
The heating system must be flushed before filling. See indications and warnings
from the cap. 8.1;8.3.
The following operations are executed to fill the installation:
- install a flexible hose with interior diameter of 4mm to the manual airifier - fig. 1.7
- ellectrically power the central heating station;
- open the filling tap (fig. 1.6) of the central heating station and of the thermal/ house
water installation;
- charge the station with a pressure of up to 1.5 bar shown on the display;
- close the filling tap of the central heating station;
- check the system to be water-proof. If there is leakage, solve the problem;
- activate the pump of the station to air the installation: for activation long press J7
key and the pump will turn on, while the central heating station is OFF (Stand-by);
- repeatedly maneouver the manual airifier to eliminate the air from the main switcher,
leave the pump on until no more sounds are heard in the installation;
- air the radiators;
- check the pressure in the installation; if necessary, fill with thermal agent observing the
above mentioned steps;
- turn off the station pump by pressing J7 key or by turning on the station by pressing
POWER;
- dismantle the flexible hose.
Caution!
Filling of the installation can be done only with the fuel tap closed.
Danger of explosion when BOILER is turned on!
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USER MANUAL C33GC24
Fig. 1.6
Fig. 1.7
OPEN
Filling tap
Airifier tap
Flexible hose
Caution! Obligatory operation!
Check the correct functioning of the pump with no fuel in the central heating
station.
Functioning of the central heating station with a blocked pump can lead to
complete damage of the main heating switch.
Caution! Obligatory operation!
Incorrect airing of the installation can cause damage of the main heating switch.

© KÖBER SRL VADURI BRANCH
Note!
Recommended pressure on the thermal circuit is 1.5 bars.
The following operations are executed to empty the installation:
Emptying of the station implies the following:
- turn off the station by pressing Power si switch off the electric power, close the gas tap;
- close the thermal tap and the cold water input tap;
- open the filling tap (fig.1.6), loosen the airifying tap (fig. 1.7) and then open the
consumer point of hot house water.
Caution!
Danger of hot water burns when emptying the BOILER.
13
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USER MANUAL C33GC24

© KÖBER SRL VADURI BRANCH 14
9 Operation instructions
9.1 Control Panel
The LMC1X control panel (fig.1.8) allows the visualization and change of parameters defining
the functioning of the central heating station. It consists of: 8 keys (J1÷J8) - tab.3 and LCD
display, where communication messages (graphic symbols) are displayed. The meaning of
the 10 types of symbols (S1÷S10) is presented in table 4.
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USER MANUAL C33GC24
Tabel 3: Control panel keys
Fig.1.8 Control panel
Fig. 1.8 Functions of keys on the control panel
J1 J2 J3 J4
J5 J6 J7 J8
S1 S3 S4 S5 S6 S7 S8 S9 S10
S2
Used to increase the set thermal temperature or to navigate the
installation submenu
Used to decrease the set thermal temperature or to navigate the
installation submenu
Used to increase the set temperature on hot water circuit or the value
of the current parameter in the installation submenu
Used to decrease the set temperature on hot water circuit or the
value of the current parameter in the installation submenu
Used to switch the station on/ off
Used to reset the electronic control board from an error state
Used to change the functioning mode winter/ summer
Used to activate/ deactivate the light on the display
Key Symbol Description:
J1
J2
J3
J4
J5
J6
J7
J8
CH +
CH -
DHW+
DHW-
POWER
RESET
LIGHT
Tabel 4: Description of graphic symbols in the LCD display
Description:
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
It diplays the temperature (°C), set value, parameter values
It displays informative values, parameter values, pressure
It shows the state of the central heating station (Closed (OFF) = active symbol,
Open (ON) = inactive symbol)
It shows the presence of flame
It shows whether the set functioning mode is SUMMER (active symbol)
It shows whether the set functioning mode is WINTER (active symbol)
The symbol is displayed continuously, which means that the boiler functions on CH.
The symbol is displayed interrupted when the thermal temperature is set.
If this symbol is displayed continuously it means that the boiler functions on DHW.
The symbol is displayed interrupted when the hot water temperature is set.
It shows the fact that the S2 symbol displays the value of the pressure
It shows the fact that there was an unsaved change of parameters in the EEPROM
memory (it flashes)
bar
Symbol

© KÖBER SRL VADURI BRANCH 15
EN
USER MANUAL C33GC24
9.2.5 Graphic context – waiting state
Waiting state is associated with a functioning state of the station, but with no
burning request. All the activating/state elements of the central heating
station are active and all burning requests are accepted if no error is present.
In this state, the display shows pressure and thermal temperature, as well as
the functioning mode summer/ winter.
-Normal errors: all the activating/state elements of the central heating station are active and
any burning request is ignored. Getting out of a normal error state is done by pressing the RESET
key;
-Informative errors: all the activating/state elements of the central heating station are active
and all burning requests are accepted. Getting out of an informative state is done
automatically when the cause of error disappears.
In this context the diplay flashes a message with the error code.
Possible actions:
- RESET – reset critical or normal errors;
- LIGHT - activation or deactivation of light functions – possible only if the central heating station
is not in a state of critical error. Figura 1.11 is a good example of display of an error (in our case
E20).
Fig. 1.12
9.2.1 LIGHT function
LIGHT key (J8 fig.1.5) is used to activate/ deactivate the light on display
function.
9.2.2 Graphic context – station startup
When started, the station is in an intermediary state for 5 seconds,
necessary to initialise the system. During this interval the diplay shows only
the message “On” on the S1 symbol on the interface (see figure 1.9).
9.2. 4 Graphic context – error state
The display of an error is sometimes asociated with a state of
malfunctioning/ error of the station. There are three types of errors:
Critical errors: all the activating/state elements of the central heating
station are inactive and any burning request is ignored. Getting out of this
critical error state is done by pressing the RESET key;
9.2.3 Graphic context - Stand-by
This context is associated with an inactive/ waiting state of the central heating station. In the
stand-by state all the activation elements are inactive and every burning demand is ignored.
An exception to the rule: the anti-freezing function (generated by a value of water
temperature in the installation lower than 9°C, which will initiate a burning cycle to prevent the
freezing of the thermal agent in the installation.
Entering and exiting this regine is done by pressing POWER key for at least one second.
Possible actions:
- POWER – comute between ON/OFF states;
- LIGHT – activation or deactivation of light functions.
Figure 1.10 is a good example of display in the stand-by state (pressure on the thermal
installation 1,8 bar).
Fig. 1.9
Fig. 1.10
Fig. 1.11
9.2 Description of functions and of graphic contexts diplayed on the control panel LMC1112

© KÖBER SRL VADURI BRANCH 16
EN
USER MANUAL C33GC24
Possible actions:
- POWER - comute between ON/OFF states;
- IN/SU – comute between summer/ winter functioning modes;
- LIGHT - activation or deactivation of light functions;
- CH+ - display and setting of maximum thermal temperature;
- CH- - display and setting of minimum thermal temperature;
- DHW+ - display and setting of maximum hot water temperature;
- DHW- - display and setting of minimum hot water temperature.
Figura 1.12 is an example of display in the waiting state (pressure in the heating installation
is 1,4 bar, working mode is summer, and the temperature in the installation is 17°C.
9.2.6 Graphic context – functioning state
This state is associated with the presence of flame or the functioning of the circulation
pump of the station. In this state, all the activating/state elements of the central heating
station are active and the burning request is accepted. The display shows the delivered
instant temperature on the circuit meeting the request (heating ot hot water – symbols S5
or S6), regardless of the presence or lack of flame, the pressure inside the installation and
the functioning mode summer/ winter.
Posibile actions:
- POWER - comute between ON/OFF states;
- IN/SU comute between summer/ winter functioning modes;
- LIGHT - activation or deactivation of light functions;
- CH+ - display and setting of maximum thermal temperature;
- CH- - display and setting of minimum thermal temperature;
- DHW+ - display and setting of maximum hot water temperature;
- DHW- - display and setting of minimum hot water temperature.
9.2.7 Graphic context – adjustment of functioning parameters
The adjustment of the main functions of the station (thermal temperature, hot water
temperature) can be done both in the waiting state and in the functioning state.
When we enter the state display of these values, the last value previously set will be displayed.
Only in the period the set value is displayed we can make changes of its value. Practically, at
any moment of functioning of the station, by pressing J1 (CH+) or J2 (CH-) keys, the set value of
the thermal temperature will be displayed and can be changed.
Similarlry, at any moment of functioning of the station, by pressing the J3 (DHW+) or J4 (DHW-)
keys, the set value of the hot water temperature will be displayed and can be changed.
While doing these settings, the display will show the value of the set temperature (thermal or
hot water), the pressure in the installation and the functioning mode of the station (winter/
summer).
Fig.1.13
Fig.1.14
Figures 1.13 and 1.14 are two examples of graphic display of this context. Figure 1.13 – pressure
in the heating installation is 1,8 bar, central heating station is in winter mode, flame is present,
heating demand is satisfied and the instant thermal temperature is 43°C;
Figura 1.14 – pressure in the heating installation is 1,7 bar, central heating station is set on
winter mode, flame is present, station deliveres hot water, and the instant hot water
temperature is 53°C.

© KÖBER SRL VADURI BRANCH 17
EN
USER MANUAL C33GC24
9.2.8 Graphic context - Service submenu
In the Service submenu, various functioning parameters of the central heating station can be
viewed/ changed/ checked. This submenu can be accessed only by service personnel
authorised by KOBER SRL Vaduri Branch.
9.3 Central heating station startup
To startup the station press POWER key fig.1.8.
Choosing the functioning mode winter/ summer
By pressing J7 key you can change the functioning mode winter/ summer. This can
be viewed on the display, symbol S5/S6 will be activated;
Adjusting temperature on the thermal circuit
The adjustment of temperature is done by pressing J1 and J2 keys. Press J1 to increase
temperature and J2 respectively to decrease temperature;
Adjusting water temperature on the hot water circuit
The adjustment of temperature is done by presing J3 and J4 keys. Press J3 to increase
temperature and J4 respectively to decrease temperature;
9.4 Functioning on domnestic hot water (DHW)
The station can function as DHW in both seasons – winter and summer.
The WHW request has priority over the heating request in the „winter” mode.
The station can function as instant DHW or as accumulation boiler DHW (the boiler is
purchased separately). For the functioning of the station as an accumulation boiler DHW
station please contact an authorised service company.
In intant regime, the minimum flow of hot water detected by the station is 2.4 l/min.
For confort in using the station as a DHW station we recommend to exploit the station at a flow
of approximately 7-8 l/min.
When the station functions with low flows, the station functions continuously at the minimum
charge as long as the hot water temperature is under the threshold limit of 63°C. When the hot
water temperature reaches the mentioned limit of 63°C, the burner is closed and a new
burning will happen when the hot water temperature is lower than the limit of 60°C
When the station functions with high flows, the hot water temperature will be the opposite of
the hot water flow, but lower than the set temperature.
With instant WHW configuration on request the CONFORT function can be activated/
deactivated. Please contact an authorized service company. This function allows the
delivery of hot water as soon as possible, while keeping the boiler hot. If the function is active,
the boiler starts when the hot water temperature is equal to the set hot water temperature;
the boiler stops when the hot water temperature is 8°C ( fixed value) higher than the set hot
water temperature. If the water heated in this way is not consumed within one hour, the
CONFORT function is automatically deactivated.
Getting out of this setting mode is done automatically if no key is pressed for
at least 3 seconds.
Figures 1.15 and 1.16 are two examples of displaying temperature in the
setting mode.
Figure 1.15 – pressure in the heating installation is 1,8 bar, central heating
station is set on winter mode, set value of thermal temperature is 42°C;
Figure 1.16 – – pressure in the heating installation 1,6 bar, central heating
station is set on winter mode, set value of hot water temperature is 60°C.
Fig. 1.15
Fig. 1.16

© KÖBER SRL VADURI BRANCH 18
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USER MANUAL C33GC24
9.5 Functioning as heating station (HS)
The station functions in this mode when „winter” season is selected. For the selection of the
type of heating installation (floor or radiators) please contact an authorised service
company.
If a thermoregulator is connected to the electronic board, the stations functions in
thermal mode only when the surrounding temperature is lower than the set temperature in
the thermoregulator.
9.6 Preset functions related to station safety
1. Anti-freezing protection function. If the temperature in the installation drops below 9°C,
the system turns on the heating at minimum charge until the temperature reaches 30°C.
2. Post-circulation of the hot water and heating pump function. The post-circulation cycle
starts only if the system is not in the BURNING state.
Advantages:
a) it prevents the water from becoming stationary at high temperatures inside the heat
switch. In this way, calcareous deposits are reduced significantly
b) it prevents water from boiling inside the heat switch in the post-heat interval.
These advantages have as result the protection of the heat switch.
3. Pump anti-blocking system and three-way valve.
If the station did not go through a burning cycle in the last 24h, the pump will be started for 12
seconds to avoid its blocking. In this time the three-way valve is also activated and
deactivated.
4. Post-ventilation
After each station stop, the ventilator still functions for some time to evacuate completely the
burning gases out of the station and also the water vapours they contain. In this way, both the
ventilator control electric circuit and the primary heat switch, which cools down partially, are
protected.
5. “Legionella” bacteria prevention function
This function is active for the functioning of the station as accumulation boiler WHW.
When hot water is prepared in the boiler, the ANTILEGIONELLA function is actived
automatically. This function implies that once a week, the temperature of the water in the
boiler is kept at the value of 65°C.
9.7 Setting additional functions
Setting additional functions is done only in the "Service" menu. Please contact an
authorised service company

© KÖBER SRL VADURI BRANCH 19
9.7 Error signals
Possible errors of the system are indicated by the following codes which appear on the display:
Non-
volatile
Code Description Resetting mode
Problems of the feeding source
Malfunction of the electronic board
AUTO- RESETTABLE when
the cause disappears!
Contact an authorised
service company!
AUTO- RESETTABLE when
the cause disappears!
Contact an authorised
service company!
AUTO- RESETTABLE when
the cause disappears!
Contact an authorised
service company!
YES
NO
E01
E02
Malfunctions of the interface mode
Frequent resetting of the electronic board
(abnormal in the last 3 hours)
Installation parameters from the EEPROM
memory are corrupted
Internal memory is corrupt
Rapid increase of the output water temperature
(presence of air in instalation; low flow or blocked
pump – for flowswitch alternative)
Difference between input/ output
temperatures too big
No water flow signal when the boiler pump is
activated
Failed burning after three attempts
Malfunction of flame detection
Malfunction of the electronic board
Malfunctioning burnt gases sensor
Water system pressure is incorrect.
Water pressure in the installation is too low
(lower than 0,8 bars).
Resettable error when the cause disappears!
Fill the installation with water to the
recommended working pressure (1.5 bars)
and monitor the pressure for a few days.
If pressure continues to drop, check for water
leakage on one of the joints of the thermal
installation. If you checked and it is allright,
but the presuure continues to drop,
contact an authorised service company.
Manually resettable
by pressing RESET!
Contact an authorised
service company!
Manually resettable
by pressing RESET!
Contact an authorised
service company!
Manually resettable
by pressing RESET!
Contact an authorised
service company!
NO
NO
NO
YES
YES
NO
YES
YES
YES
YES
YES
NO
E04
E06
E07
E08
E11
E13
E15
E20
E22
E23
E25
E30
E10
EN
USER MANUAL C33GC24