Kober MKDens35 PLUS User manual

KÖBER SRL VADURI BRANCH
USER MANUAL
CONDENSING GAS BOILER
C38GC35-BA
The image is for presentation
purpose. The product differs
depending on the purchased
model, the area and the
purchase period.
Condensing boiler
MKDens35 PLUS
(C38GC35-BA)
Vaduri no.25, Alexandru cel Bun commune,
Neamt 617511, Romania Tel .: [phone], Fax: [phone]
www.motan.ro
21
2726

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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Contents
1 SECURITY INSTRUCTIONS AND SYMBOLS .................................................................................................................... 3
1.1 Validity of instructions ..................................................................................................................................................................... 3
1.2 EC marking ...................................................................................................................................................................................... 3
1.3 Use according to the destination .................................................................................................................................................. 3
2 DESCRIPTION OF THE BOILER ....................................................................................................................................... 4
2.1 Structure .......................................................................................................................................................................................... 4
2.2 Constructive and functional characteristics ................................................................................................................................ 5
3 SAFETY INSTRUCTIONS ................................................................................................................................................. 6
3.1 Safety instructions ........................................................................................................................................................................... 6
4 ASSEMBLY ..................................................................................................................................................................... 6
4.1 Unpacking the product .................................................................................................................................................................. 6
4.2 Mounting set ................................................................................................................................................................................... 6
4.3 Overall dimensions and mounting position .................................................................................................................................. 7
4.3.1 Place of installation .......................................................................................................................................................................... 7
4.4 Minimum required distances / free spaces for mounting ............................................................................................................ 8
4.5 Fixing the boiler ............................................................................................................................................................................... 8
5 INSTALLATION .............................................................................................................................................................. 9
5.1 Conditions for boiler installation ..................................................................................................................................................... 9
5.1.1 Installation instructions ................................................................................................................................................................ 9
5.1.2 Indications for the protection of the boiler in order to maintain the warranty ...................................................................... 9
5.2 Gas connection ............................................................................................................................................................................ 10
5.3 Connecting the boiler to the heating installation ...................................................................................................................... 10
5.4 Connecting the boiler to the domestic hot water circuit ......................................................................................................... 11
5.5 Condensate drain pipe connection ........................................................................................................................................... 11
5.6 Safety valve connection .............................................................................................................................................................. 12
5.7 Air / flue inlet / exhaust pipes ....................................................................................................................................................... 12
5.7.1 Use of coaxial kit ....................................................................................................................................................................... 12
5.7.2 Use of dual kit ............................................................................................................................................................................ 14
5.7.3 Use of vertical coaxial kit .......................................................................................................................................................... 14
5.8 Connection to the electrical network ......................................................................................................................................... 15
5.9 Installation of the room thermostat and the outdoor sensor..................................................................................................... 16
5.9.1 Installing the room thermostat ................................................................................................................................................. 16
5.9.2 Connecting the outdoor sensor ............................................................................................................................................... 16
5.10 Filling and emptying the installation ........................................................................................................................................ 18
6 ELECTRONIC CONTROL MODULE - USER INTERFACE, OPERATING CYCLE ............................................................. 20
6.1
The control paneel
LMC1112-C15 ............................................................................................................................................. 20
6.2
Description of the functions and graphical contexts displayed by the LMC1112-C15 control panel ................................... 20
6.2.1 Graphic context - Display error E88 ......................................................................................................................................... 20
6.2.2
LIGHT function
.......................................................................................................................................................................... 21
6.2.3
Graphic
Context
- boiler start .................................................................................................................................................. 21
6.2.4 Graphic
Context
- Stand-by .................................................................................................................................................... 21
6.2.5
Graphic context - error status
................................................................................................................................................ 21
6.2.6 Graphic context - standby state
........................................................................................................................................... 21
6.2.7
Graphic context - operating status
...................................................................................................................................... 21
6.2.8
Graphic context - adjustment of operating parameters
.................................................................................................. 22
6.2.9 Graphic Context - COMFORT function .................................................................................................................................... 22
6.2.10 Graphic context -Activation of the VTP function - Periodic Technical Verification ......................................................... 22
6.2.11 LMC202 Graphic context - SERVICE submenu .................................................................................................................... 22
7 COMMISSIONING ...................................................................................................................................................... 23
7.1 Commissioning works.................................................................................................................................................................... 23
7.2 Starting the boiler .......................................................................................................................................................................... 23
7.2.1 Domestic hot water operation ................................................................................................................................................. 23
7.2.2 Heating operation ..................................................................................................................................................................... 24
7.2.3 Preset boiler safety functions .................................................................................................................................................... 24
7.3 BOILER switch off in safety conditions ......................................................................................................................................... 24
7.4 User training ................................................................................................................................................................................... 25
7.5 Quality and warranty conditions ................................................................................................................................................. 25
8 INSPECTION AND MAINTENANCE............................................................................................................................. 25
8.1 Inspection and maintenance intervals ....................................................................................................................................... 25
8.2 Maintenance works ...................................................................................................................................................................... 26
9 DESCRIPTION OF THE ERRORS AND WAY OF TROUBLESHOOTING THEM ................................................................ 27
10 DISPOSAL OF ELECTRICAL AND ELECTRONIC WASTE (GEO 5/2015) ...................................................................... 28
11 ANNEXES .................................................................................................................................................................... 29
11.1 Wiring diagram .......................................................................................................................................................................... 29
11.2 Hydraulic characteristic of pump ............................................................................................................................................ 31
11.3 Product hydraulic scheme ....................................................................................................................................................... 33
11.4 Sketches necessary for installation and commissioning ......................................................................................................... 34
11.5 Recommended minimum distances for mounting the coaxial kit ........................................................................................ 35
11.6 Operating scheme .................................................................................................................................................................... 36
11.6.1 Central heating with radiators and domestic hot water preparation in instant regime – informative layout ............... 36
11.6.2 Central underfloor heating and instant hot water preparation – informative layout ...................................................... 36
11.6.3 Central heating with radiators + floor and domestic hot water preparation instantly – informative layout .................. 37

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1 SECURITY INSTRUCTIONS AND SYMBOLS
When installing the boiler, please follow the safety instructions in this manual!
This manual is the property of KÖBER SRL-SUCURSALA VADURI. It is forbidden to copy or reproduce it without the written
approval of KÖBER SRL-SUCURSLA VADURI.
In the following, the symbols used in the text are made explicit:
Danger! -direct danger to bodily integrity and life;
Danger! -danger of death from electric shock;
Warning! -potentially hazardous situation for the product and the environment;
Indication! -useful information and indications. This symbol indicates a required activity;
1.1 Validity of instructions
These instructions are only valid for the C38GC35-BA condensing wall-mounted boiler.
Description of wall-mounted condensing boilers.
Trade name TYPE POWER
MKDENS 35 C38GC35-BA 35 kW
Where:
C38 - internal coding;
G - type of fuel - gas;
C- in condensation;
35- the maximum nominal power that the boiler can supply, in kW;
BA-Boiler with built-in storage
Boiler is designed to use gases of classes:
I2H
The type of gas for which the appliance is adjusted is specified on the product label and on the stamp plate.
1.2 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)
- EcoDesign Directive 2009/125/EC
- Directive regarding energy efficiency 92/42/EEC and European Regulations no.811-814/2013
- Directive regarding electromagnetic compatibility 2004/108/EC (ex. 89/366/CEE)
- Directive for low frequency 2006/95/EC (ex. 73/23/EEC).
1.3 Use according to the destination
-
The gas boilers 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 station 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 station 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;
- 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
.

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2 DESCRIPTION OF THE BOILER
2.1 Structure
The structure of the condensing wall-mounted thermal boiler C38GC35-BA
Tab. 2.1Condensing wall-mounted boiler components
1 40L automatic boiler aerator 14 Gas valve
2 Boiler temperature sensor immersed
sheath 15 District heating pressure sensor
3 Primary circuit overtemperature
thermostat 16 Secondary heat exchanger
4 3-way valve actuator 17 3 bar overpressure valve
5 District heating temperature sensor 18 Flowswitch
6 Temperature sensor (soft monitoring) 19 Fan
7 40L thermal insulated boiler 20 Ignition electrode
8 2L expansion vessel (boiler thermal
expansion takeover) 21 Main heat exchanger
9 DHW temperature sensor 22 Expansion vessel 8L (taking over thermal
expansion of the district heating circuit)
10 DHW circuit pump (boiler charging) 2. 3 Ignition transformer
11 Electronic box 24 Flue gas temperature sensor
12 Heating return temperature sensor 25 Filling valve
13 District heating pump 26 Automatic flow regulator
Figure 2.1

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2.2 Constructive and functional characteristics
Tab. 2.2: Technical characteristics of the C38GC35-BA boiler.
(**) - The boiler is delivered standard with coaxial kit, the dual kit is delivered as an accessory on request (see chap. 5.7.2)
Name MKDENS35
Type C38GC35-BA
Gas category I2H (GN-G20)
Circulation Forced
Combustion chamber Condensation
Yield stars (dir. 92/42 / EEC) ****
NOx class (G20) 5
Energy efficiency class in district heating operation A
Energy efficiency class in operation on domestic hot water A
Nominal caloric flow min / max - district heating G20 kW 3.5 / 33.9
Maximum rated power (80/60 ° C) (kW) G20 kW 32.8
Maximum rated power (50/30 ° C) (kW) G20 kW 35.8
Useful efficiency at nominal caloric flow at 80/60 ° C G20 % 97
Useful efficiency at nominal caloric flow at 50/30 ° C G20 % 106
Maximum nominal fuel consumption depending on the
condensing / non-condensing operating mode G20 mc / h
3.5
Seasonal energy efficiency related to space heating in active mode ηS (%) 91
Gas supply
pressure
GN at connection (after reducer) 20 mbar (max. 25 mbar, min. 17 mbar)
GN maximum allowable 35 mbar
District heating
circuit
Pressure on the district heating circuit minimum 0.8 bar - maximum 3 bar
Temperature adjustment range 30 ÷ 80 ° C
Floor system temperature adjustment interval 15 ÷ 45 ° C
DHC circuit
DHW temperature adjustment interval 30 ÷ 60 ° C
DHC Comfort EN 13203 ***
Domestic hot water flow at ∆ t = 30 ° C
17l / min
Domestic hot water flow max. AT = 30 ° C
21 l / min (for 10 min)
Boiler water volume
40L
Boiler regeneration time
20 min
Electrical
characteristics
Feeding
~ 230VAC / 50 Hz
Power consumption absorbed (incl
uding boiler
circulation pump)
81 W
Constructive features
Height
1100 mm
Width
756 mm
Depth
384 mm
Height with elbow mounted
1260 mm
Weight
Without
packaging
86 kg
With packaging
93 kg
Primary heat exchanger capacity ~ 1.8 l
CONNECTIO
NS
Heating input and output 3/4 ''
Cold water inlet, domestic hot water outlet 1/2 ''
Gas supply 3/4 ''
Membrane expansion vessel on the district heating circuit
8 l
Expansion vessel with membrane on the domestic hot water circuit
2 l
Exhaust type
B2
3; B33; C13; C13x; C23; C23x; C33;
C33x; C43; C43x; C53; C53x; C63; C63x;
C73; C73x; C83; C83x; C93; C93x
Type of exhaust pipe
Coaxial kit length D60 / D100 min. 1m
-
max. 20m **
Dual kit length D80 / D80 min. 1m -
max.
20m
Flue gas temperature (return temperature 30 ° C)
~ 69 ° C
Protection class Class IP40
Informative values:
The maximum recommended volume of water in the
installation 200 l

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3 SAFETY INSTRUCTIONS
3.1 Safety instructions
3.1.1 Installation and adjustment
Installation can only be performed by an authorized installer. It also takes responsibility for the correct installation and for the
first commissioning. Carrying out the adjustment works as well as the maintenance and repair is allowed only to an authorized
company.
Danger!
Danger to life due to poisoning and explosion due to leaks in the gas routes in case of irregular installation!
Danger of damage when using improper tools. When tightening or loosening threaded joints, use only suitable
fixed wrenches.
3.1.2 Smell of gas
When the smell of gas appears, the following will be taken into account:
- Do not operate the electrical switches in the dangerous area;
- Do not use open flame;
- Do not smoke in the dangerous area;
- Do not use the phone in a dangerous area;
- Close the gas valve;
- Ventilate endangered area;
- Notify the gas distribution company.
3.1.3 Changes in the adjacent area of the heater
No operation to modify the following installations is allowed:
- The boiler;
- For gas, water pipes and electricity cables;
- For air / gas intake / exhaust pipes.
4 ASSEMBLY
4.1 Unpacking the product
1. Remove the product from the carton.
2. Remove the protective film from the product.
4.2 Mounting set
Check that the mounting set is complete and undamaged - see table 4.1.
Tab. 4.1 Mounting set
Pos. Pcs Name
1
1
Boiler
2
1
Boiler
support
3 1
Small bag
-
contains:
- mounting dowels 8x80 - 2 pcs.
4 1
Printed package
-
contains:
- technical manual - 1 pc.
- declaration of conformity - 1 pc
- warranty certificate and
commissioning report -1 pc.
3
4
Fig.4.1

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4.3 Overall dimensions and mounting position
4.3.1 Place of installation
When choosing the installation location, please consider the following safety instructions:
Warning!
Do not install the boiler in areas endangered by frost! In case of frost the boiler can be damaged.
These devices cannot be installed and used outdoors. External installation may cause malfunctions.
Warning!
It is not recommended to install the boiler in bathrooms, kitchens, near a swimming pool, laundry or other areas with
high humidity.
The boiler can only be installed in enclosures with a maximum humidity of 60% in the range of 20-30 ° C, in order to
prevent damage to the electronic components.
Warning!
Combustion air must not contain: chlorine, ammonia, alkaline agents, halogenated hydrocarbons, freon, drywall, lint,
dirt or dust; otherwise damage to the heat exchanger may occur. The boiler must NOT be installed in an environment
with high humidity, dust, vapors, condensation or ambient temperatures higher than + 50 ° C or below 15 ° C. These
substances can lead over time to the formation of corrosion in the appliance and in the air / gas intake / exhaust
pipes.
The legend:
A - District heating connection
B - Domestic hot water outlet connection
C- Fuel supply connection
D - Cold water inlet connection
E - Heating return connection
F - Boiler drain connection
FIG. 4.2 Overall dimensions and mounting positions.
Fig. 4.2

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4.4 Minimum required distances / free spaces for mounting
Both for the installation / assembly of the boiler, and for carrying out subsequent maintenance works, you need the following
minimum distances (fig. 4.3), respectively
minimum free spaces for installation:
- distance from the front: 500 mm;
- distance from the sides: 100 mm;
- distance from the bottom: 250 mm;
- distance from the upper part: 400 mm;
Warning!
Danger of damage to the boiler
due to incorrect fixing!
The device can only be mounted on a flat,
fixed surface.
Indication!
The minimum distances / free
mounting spaces mentioned are also valid for
cabinet mounting.
4.5 Fixing the boiler
- drill two holes for fixing the boiler support (1);
- mark the position of the exhaust / intake piping
- mount the boiler support (1) with the dowels and screws
provided (2, 3) on the wall (fig.4.5);
- suspend the boiler (4) on the boiler support.
FIG. 4.3
Fig. 4.5

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5 INSTALLATION
Danger!
Danger to life due to poisoning and explosion due to leaks in the gas path in case of faulty installation!
The installation and commissioning of the device is allowed only to a company authorized according to the
legislation in force for assembly and aggregates by KÖBER SRL- Vaduri Branch.
It also takes responsibility for the correct installation and for the first commissioning.
5.1 Conditions for boiler installation
5.1.1 Installation instructions
The boiler will be subjected to the corrosion effect, from the moment it is filled with water. It is essential that the following
installation instructions are taken into account so as not to aggravate the corrosion phenomenon.
 The flue gas must have a sulfur content within the limits of the European standard in force: a maximum of 150 mg / m3 is
accepted for a short period of time, but the annual average must be 30 mg / m3.
Combustion air must not contain: chlorine, ammonia, alkaline agents, halogenated hydrocarbons, freon, drywall, lint, dirt
or dust;
Installing the boiler near a swimming pool, a washing machine or laundry, can lead to contamination of the combustion
air with these compounds;
 The pH of the water must be within the following limits: 7.5 <pH <8.5;
 It is recommended to regularly check the pH of the heating agent, if the value does not fall within the limits given by the
manufacturer, treated it again;
 The hardness of the water must be within the limits: 5 ° F <TH <15 ° F (5 ° F (French degrees), the equivalent of 50 mg CaCO3
or an equivalent amount of other Ca and Mg salts);
 Maximum permissible free residual chlorine content of 0.5 mg / l and maximum permissible chloride level of 250ppm;
 It is recommended to make repeated starts of the boiler, with the fuel valve turned off, in order to ventilate the installation.
Opening and closing the 3-way valve, by permuting in summer / winter also allows a better ventilation of the installation.
 If the boiler is not used for a long time in the cold season, it is necessary to completely empty it so as not to cause
damage due to frost. The use of antifreeze is not covered by the warranty.
5.1.2 Indications for the protection of the boiler in order to maintain the warranty
Before and during the installation, the boiler must be protected from the inclusion of impurities: construction dust, sand, copper
dust, grease, etc. as well as welding splashes, slag. In any of these cases, the installation must be washed well with clean
water, mixed with a very concentrated cleaning agent.
In general, in order to maintain the guarantee, it is necessary to apply any treatment necessary to prevent water
contamination with the following:
 Black sludge (magnetite - Fe3O4) formed as a result of continuous electrolytic corrosion in any unprotected
installation with an inhibitor;
 Red mud (Fe2O3) - is a product of oxidation;
 Limestone deposits that are deposited especially on the hottest areas of the boiler;
The mixture of the three factors listed causes most of the problems in heating systems.
 The presence of these substances inside the primary or secondary exchanger of the boiler means that the standard
prevention measures have not been met. This is a cause of a loss of warranty.
For the protection of the boiler equipped with condensing heat exchanger, it is recommended to use the following corrosion
inhibitors as a preventive and curative treatment sold by KÖBER SRL.
Producer Treatment type
CLEANEX OXI A
Alkaline cleaning agent for condensing boiler heat exchangers
The alkaline cleaning agent is formulated with specific corrosion inhibitors for light alloys (aluminum or
aluminum-silicon) and stainless steel. Designed to remove organic deposits and / or oxide accumulation
appearing in the combustion chambers of condensing boilers equipped with primary exchangers made
of light alloys with aluminum or stainless steel
CLEANEX OXI B
Acid cleaning agent for condensing boiler heat exchangers
The acid cleaning agent is formulated with specific corrosion inhibitors for light alloys (aluminum or
aluminum-silicon) and stainless steel as well as dispersants for metal oxides. Designed to clean
combustion chambers of condensing boilers equipped with primary exchangers made of light alloys with
aluminum or stainless steel (if required and possible).
Warning!
The presence of these substances (antifreeze / black mud / red mud / limescale deposits) means that the standard
measures to prevent problems in your heating system have not been met.
This is a cause a loss of warranty!

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5.2 Gas connection
Danger!
Danger to life due to poisoning and explosion due to leaks in the gas path in case of faulty installation!
The installation of the gas part is only allowed by an authorized installer. It also takes responsibility for the correct
installation and for the first commissioning.
During the work, the legal provisions will be observed, as well as the local prescriptions of the gas supply
companies.
When installing the gas pipe, make sure that it is not tense, so as not to cause leaks!
Warning!
The maximum safe operating pressure of the gas valve is 60 mbar! Damage may occur by exceeding this pressure.
The natural gas pressure GN at the entrance to the gas valve must be maintained in the range of 20 ÷ 25 mbar!
Warning!
It is mandatory to mount a pressure regulator on the fuel supply circuit.
Warning!
If parasitic voltage appears on the gas pipe, it is insulated by installing an electrical insulating part (according to the
Technical Norms for the design and execution of natural gas supply systems).
Boilers in the range C38 work only with natural gas GN. The gas connection is made of stainless steel pipe with an inner
diameter of 16.4 mm. The gas supply line must not have a diameter smaller than the gas connection of the boiler. Refueling
must be done in accordance with the legal regulations in force.
5.3 Connecting the boiler to the heating installation
When designing the district heating circuit, the hydraulic characteristic of the pump that equips this boiler model will be taken
into account! See chap. 7.11 "Hydraulic pump characteristic" and volume of the expansion vessel.
The boiler is equipped with an expansion vessel with a capacity of -7l and a loading pressure of 0.8bar.
For the 7l expansion vessel the maximum recommended volume of water in the installation is 200l at a Δt = 50 ° C and a
working pressure of 0.8 ÷ 2.5 bar.
Before mounting the appliance, check that this volume is sufficient. If not, an additional expansion vessel must be installed on
the suction side of the pump.
Warning!
Check the pressure in the expansion vessel before the first start-up.
The pressure in the expansion vessel must be 0.8 ÷ 1bar.
Warning! Before connecting the boiler, carry out a thorough washing of the entire heating system! In this way,
remove debris such as welding splashes, slag, hemp, putty, rust, coarse dirt or the like from the pipes. Otherwise,
these substances may deposit in the heat exchanger and may cause malfunctions.
The boiler is connected to the district heating installation - through connections A and E (fig. 5.1).
Warning!
On the return of the installation it is mandatory to mount a
mechanic (filter Y) of impurities
A magnetic impurity filter must be installed on the heating circuit on
the return of the installation!
The lack of a magnetic impurity filter mounted on the return of the
installation leads to the loss of the warranty!
The mechanical filter cannot retain all impurities, for example, very
fine metallic impurities, can pass through the mechanical filter and
once reached in the boiler body can cause defects: irreparable
failure of the exchanger body, operating noises, etc.
If a magnetic filter is installed, the metal particles will be retained and
will no longer be entrained in the boiler body !.
Warning!
When installing the connection pipes, care must be taken not to strain them, in order to avoid leaks!
The maximum allowable working pressure is 3 bar.
The recommended working pressure is 1.5 bar.
Warning!
The use of the boiler without thermal or partially filled agent is forbidden - danger of explosion;
The use of the boiler without being completely ventilated is forbidden!
If the volume of water in the district heating circuit is greater than 200 liters or if the pressure in the district heating circuit
exceeds 2.5 bar at the maximum heating temperature, it is mandatory to install an additional expansion vessel. The pre-
loading pressure of the additional expansion vessel must be identical to the pressure in the expansion vessel mounted on the
boiler.
FIG. 5.1

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5.4 Connecting the boiler to the domestic hot water circuit
The boiler is connected to the domestic hot water installation - through connections B and D (fig. 5.1).
Warning!
It is mandatory to install softener filters and a mechanical impurity filter on the cold water inlet connection.
Warning!
When installing the connection pipes, care must be taken not to strain them, in order to avoid leaks!
The occurrence of pressure shocks (supply pressures higher than 3-4 bar simultaneously with the actuation of the
quick-closing valves), can affect the components of the hydraulic circuit inside the boiler. We recommend installing a
pressure regulator! Damage to the boiler elements due to pressure shocks or the use of too much pressure on the cold water
inlet circuit is not covered by the warranty! It is forbidden to install one-way valves on the cold water supply circuit. The cold
water supply pipe of the domestic hot water preparation circuit will remain permanently open (the network is closed only
through the taps at the consumption points) to allow the expansion of this circuit to be taken over.
Indication!
It is recommended that the distance from the domestic hot water connection of the boiler to the nearest
consumer, to be at least 6m from the pipeline. Otherwise there is a risk of scalding.
5.5 Condensate drain pipe connection
Danger!
Danger to life due to flue gas leaks!
The condensate drain pipe from the siphon must not be tightly connected to a sewage pipe, because otherwise the
internal condensate siphon can be emptied by suction and the flue gases can enter the room where the boiler is
installed.
The condensate resulting from the condensation of water vapor contained in the flue gases is discharged from the boiler,
through the condensate drain siphon (fig.5.3), which is located at the bottom of the boiler. As this condensation is acidic,
having a pH of about 3.8 ÷ 5.4, the discharge must be made through a plastic pipe (flexible) with an inner diameter of at least
Ø25 mm or more, which is connected at one end to the siphon hose and at the other end to a sewer pipe.
Before commissioning the boiler, approx. 1/2 liter of water through the flue gas connection (fig.5.2) must be introduced, in
order to form a "water plug" in the siphon - thus preventing the flue gas from escaping into the room.
The condensate evacuation route must be
continuously descending (not to present possible
areas of condensate stagnation, especially in the
situation when it crosses areas with risk of frost.
The condensate drainage route must comply with the
regulations in force regarding wastewater.
Recommended condensation removal methods:
The methods are presented below in the order in which they are recommended to be adopted depending on the possibilities
offered by the mounting positions and the existing installation. As much as possible the condensate drain must be made so
that the shortest path and gravitational flow are chosen. If there is a possibility, it is recommended to eliminate the
condensation in the ground through a pipe provided with ventilation (figure 5.4). If this is not possible, the internal sewerage
network can be used (fig. 5.5). Where neither of the first two cases is possible, a condensate pump can be used (Fig.5.6).
- KÖBER SRL sells CONLIFT 1 condensing pump, which can be purchased by the beneficiary from the sales department.
FIG. 5.3
FIG.
Condensate
discharge hose
Safety valve
connection

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Warning!
In the areas where the frost appears, the condensate evacuation is not done outside the building, which will lead to
the blocking of the evacuation route and the flooding of the combustion chamber due to the frost.
Warning!
The absence of water in the siphon causes emanations of the smoke evacuated in the ambient air.
5.6 Safety valve connection
Warning!
Danger of scalding!
The discharge valve of the safety valve (fig. 5.3) is connected to a drain pipe to the sewer. Otherwise there is a risk of flooding,
which is not the responsibility of the boiler manufacturer.
5.7 Air / flue inlet / exhaust pipes
The boiler does not require air intake in the room in which it is installed. The air required for combustion for efficient operation is
recommended to be captured from outside the building. The equipment is delivered for this purpose with a coaxial or dual
flue gas supply / exhaust system called exhaust kit.
The equipment is delivered standard with coaxial exhaust kit. On request, however, it can also be delivered with a dual
exhaust kit. It is also possible to order additional components such as elbows at 45 ° and 90 ° as well as extensions of 0.5m and
1m for both the dual system and the coaxial system.
5.7.1 Use of coaxial kit
The coaxial intake-exhaust kit, fig.5.7 is delivered together with the boiler. The exhaust is made through a tube with a diameter
of Ø60 mm, coaxial with the air intake tube with a diameter of Ø100 mm.
The connection is made as follows:
- all the gaskets are mounted in their own places;
- the end element (13) is fixed on the air / gas intake / exhaust piping;
- insert the gasket (11) for the interior on the piping;
- the piping is fixed on the elbow of the kit;
- glue the self-adhesive gasket (15), fix the elbow of the kit on the upper cover of the pressurized chamber with the screws
(16);
- mount the gasket (11) for the exterior.
Table 5.1 - Legend of figures 5.4 ÷ 5.6
1. Condensation siphon
2. Ventilation piping
3. Minimum 450 mm and maximum 3 floors of
building
4. Hydraulic closure (swan neck)
5. Condensation pump
Fig. 5.4 – Condensate elimination in ventilated soil
Fig. 5.5
-
Condensate elimination in sewage
Fig. 5.6
-
Condensate elimination via
condensation pump
Discharge slope
Discharge slope

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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Warning!
The kit must have a 3% (approximately 2 °)
ascending slope on the exhaust side for
condensate recovery, the slope is given by
the position of the terminal.
- at the mounting position of the terminal, it must be
similar to the one in figure 5.7. Mounting it in another
position can lead to the accumulation of water from
precipitation in the combustion chamber of the boiler.
Warning!
For easy installation of the kit it is necessary
to lubricate the end of the elbow (4) at the
entrance to the boiler, use only standard commercial
soap or water. Lubrication is required to prevent the
exhaust gasket from moving on the main heat exchanger (fig. 5.8).
Never use lubricant based on mineral oils, they can damage the seals.
When installing the kit, make sure that the edges of the inlet pipe to the boiler are chamfered.
Table 5.2 - Coaxial kit
Positio
n Pcs. Name Positio n Pcs. Name
1 1 Air intake plug 9 1 Air intake pipe Ø100mm
2 1 Gas outlet plug 10 1 Centering profile Ø60 - Ø 100mm
3 1 Gas outlet connector 11 2 Masking profile (through hole)
4 1 Flue gas outlet elbow Ø60 mm 12 1 Gasket Ø60mm
5 1 Air intake elbow Ø100 mm 13 1 Plastic terminal Ø60 - Ø 100mm
6 1 Gasket Ø60 mm 14 2 Self-tapping screw 4.2x16 mm
7 1 Gasket Ø100 mm 15 1 Fixing gasket 2mm
8 1 Flue gas exhaust pipe Ø60mm 16 4 Self-tapping screw 4.2x16 mm
Warning!
It is mandatory to place the thermal boilers in premises that have ventilation according to the norms in force. The
technical instructions will be studied before mounting / installation, commissioning or service intervention.
For each additional elbow used, the maximum length of the intake / exhaust pipes is reduced (90 ° - 1m elbow, 45 ° -
0.5 m elbow).
In no case will the total length of the coaxial kit, even with extensions, exceed the equivalent of 3 m (without the first elbow).
Danger!
It is forbidden to operate the boiler without air / gas intake / exhaust pipes, due to the fact that it endangers the life
and health of people.
Risk of death by escaping flue gases.
Make sure that all measuring sockets on the exhaust kit are always closed.
The replacement will be made only by authorized personnel in accordance with the legislation in force, using original parts
provided by the manufacturer.
Fig. 5.7
Slope 3% (approx. 2°)
Fig. 5.8
Fixing screws
Coaxial kit
Kit gasket
Exchanger gasket
Exchanger inlet pipe
end lubrication

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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5.7.2 Use of dual kit
The dual kit, fig. 5.9 is delivered only on request. The dual kit consists of two ducts: one for air intake and one for exhaust gases
of the same diameter, Ø80mm, two 90-degree bends and the corresponding gaskets.
The connection is made as follows (see figure no. 5.5):
- the gaskets pos. 1 and 10 are glued on the connectors pos. 2 and 9;
- fix the connectors, positions 2 and 9 on the upper part of the pressurization chamber with 4 screws each, position 3;
- position the masking profiles on the piping;
- the intake / exhaust pipes are fixed in connectors.
Table 5.3 - Dual kit
Pos. Pcs. Name Pos. Pcs. Name
1 1 Gasket 6 1 Exhaust pipe Ø 80 mm
2 1 Exhaust connector Ø 80 mm 7 4 Passage hole masking profile
3 8 Self-tapping screw Ø 3.9x9.5 mm 8 1 Air intake pipe Ø 80 mm
4 4 Gasket Ø 80 mm 9 1 Inlet connector Ø 80 mm
5 2 Elbow at 90 ° MF Ø 80 mm 10 1 Gasket
Warning!
The dual kit will be mounted with the intake pipe with a downward slope of 3%
(approximately 2 °) and the exhaust pipe with an ascending slope of 3%
(approximately 2 °). It is mandatory to place the thermal boilers in premises that have
ventilation according to the norms in force. The technical instructions will be studied
before mounting / installation, commissioning or service intervention. For each
additional elbow used, the maximum length of the intake / exhaust pipes is reduced (90
° - 1m elbow, 45 ° - 0.5 m elbow). In no case will the total length of the dual kit, even
with extensions, exceed the equivalent of 5 m (without the first elbow).
Warning!
For easy installation of the kit it is necessary to lubricate the end of the
connector (2) at the inlet part of the boiler, use only standard commercial
water or soap. Lubrication is required to prevent the exhaust gasket from moving on the
main heat exchanger.
Never use lubricant based on mineral oils, they can damage the seals.
When installing the kit, make sure that the edges of the inlet pipe to the boiler are
chamfered.
Danger!
It is forbidden to operate the boiler without air / gas intake / exhaust pipes,
due to the fact that it endangers the life and health of people.
Risk of death by escaping flue gases.
Make sure that all measuring sockets on the exhaust kit are always closed.
The replacement will be made only by authorized personnel in accordance with the
legislation in force, using original parts provided by the manufacturer.
5.7.3 Use of vertical coaxial kit
The vertical coaxial kit, fig. 5.10 is delivered only on request. The exhaust is made
through a tube with a diameter of Ø60 mm, coaxial with the air intake tube with a
diameter of Ø100 mm. The connection is made as follows:
- all the gaskets are mounted in their own places;
- fix the intake tube (8) on the upper cover of the pressurization chamber with 4 screws,
taking care that between the cover and the elbow kit to position the related gasket;
- it is fixed on the intake / exhaust pipes, taking care to position the related gaskets.
Install the roof mounting kit (4).
Fig. 5.9
Fig. 5.10

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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Table 5.4 - Vertical kit
Warning!
It is mandatory to place the thermal boilers in premises that have ventilation according to the norms in force. The
technical instructions will be studied before mounting / installation, commissioning or service intervention.
In no case will the total length of the vertical coaxial kit, even with extensions, exceed the equivalent of 5 m.
Warning!
For easy installation of the kit it is necessary to lubricate the end of the exhaust pipe (6) at the inlet part of the boiler,
use only standard commercial water or commercial soap. Lubrication is required to prevent the exhaust gasket from
moving on the main heat exchanger.
Never use lubricant based on mineral oils, they can damage the seals.
When installing the kit, make sure that the edges of the inlet pipe to the boiler are chamfered.
Danger!
It is forbidden to operate the boiler without air / gas intake / exhaust pipes, due to the fact that it endangers the
life and health of people.
Risk of death by escaping flue gases.
Make sure that all measuring sockets on the exhaust kit are always closed.
The replacement will be made only by authorized personnel in accordance with the legislation in force, using original parts
provided by the manufacturer.
5.8 Connection to the electrical network
Danger!
Danger to life due to electric shock to electrical contacts!
The power supply to the 230Vac socket is made exclusively.
The control panel must be connected to a single-phase 230V - 50Hz network, provided with earthing. The leakage resistance
of the earthing must be in accordance with the norms in force (maximum 4 ohms, and the working NUL must not have residual
currents). It is recommended to supply the boiler from a separate circuit provided with fuses with 30 mA differential protection.
External connections must comply with current regulations. The connection to the electrical network of the building must allow
complete electrical insulation of the boiler for the situations when an intervention is necessary for it.
The connection to the network is made by means of a plug mounted at the end of the 3x0.75 blue / brown / yellow-green
three-wire cable, 2m, tight in bundles in the area of the boiler hydraulic group taking into account the color semantics as
follows: Brown = phase, Blue = null, Green and yellow = grounding.
The power outlet must be accessible so that the user can easily remove the connector.
An electrical outlet for connecting a thermal boiler is compliant if:
L = phase; N = null; G = grounding
a) The voltage measured using the voltmeter on alternating current is:
LN ~ LG = 230 Vac +/- 10%
b) The voltage measured with the voltmeter is:
Pt. alternating current: NG ˂ 10 Vac
Pt. direct current: NG = 0 Vdc
c) Resistance measured between working null and grounding:
NG ˂ 0.4 Ω
Warning!
It is not allowed to dredge the boiler in an installation without earthing or with faulty earthing.
Pos. Pbcs. Name.5.
1 1 Flue gas exhaust pipe Ø 60 mm
2 1 Centering profile Ø 60/100 mm
3 1 Air intake pipe Ø 100 mm
4 1 Roof mounting kit Ø 60/100 mm
5 2 Gasket Ø 60 mm
6 1 Gas exhaust pipe Ø 60 mm
7 1 Gasket Ø 100 mm
8 1 Air intake pipe Ø 100 mm
9 1 Boiler fixing gasket Ø 100 mm
10 4 Self-drilling screw 4.2 x 16 mm
11 1 Flue gas outlet plug
12 1 Flue gas socket connector

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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5.9 Installation of the room thermostat and the outdoor sensor
5.9.1 Installing the room thermostat
The procedure for coupling a temperature controller or an external sensor to the heating unit can be done EXCLUSIVELY
by authorized personnel of the partner service companies approved by KÖBER SRL Vaduri Branch.
xxx
TA- Room thermostat (5V only)
SE- Outdoor sensor (5V only)
SB1- the boiler temperature sensor
5.9.2 Connecting the outdoor sensor
The procedure for coupling a temperature controller or an external sensor to the heating unit can be done EXCLUSIVELY
by authorized personnel of the partner service companies approved by KÖBER SRL Vaduri Branch.
Mounting an outdoor sensor is only useful in the presence of a temperature controller.
It is recommended to use the outdoor sensor KÖBER brand, type KST-E-N10.
Technical specifications:
Model: KST-E-N10
Rated voltage: max. 5 Vcc
Maximum rated current: 18 mA
Resistance to 25°C (R25): 10kΩ ± 5%
Constant β25/100: 3977 / 3988k ± 1%
Temperature field: -35°C....+115°C
By using a temperature sensor, the "climate compensation" function can be activated.
If the "climate compensation" function has been activated, then the temperature of the heat transfer fluid is adjusted
according to the external climatic conditions, ensuring high comfort and energy savings.
Thus, if the outside temperature increases, the temperature of the heat transfer fluid decreases according to a
"compensating curve" (fig. 4.7)
WARNING!
The maximum limit that the boiler will reach when heating must be set from the user interface (maximum desired
temperature on the heating circuit)!
Recommendation: - Circuit CH radiators Tset = 80 ° C;
- Circuit CH floor Tset = 45 ° C.
- TA
- SE
Fig.
5.11
Fig.
5.12
Fig. 5.13

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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Table 1 - Use of external sensor on the CH radiator circuit.
SP05 3 6 8 10 RECOMANDED SET 12 15 18 21 24 27 30 33
T ° C
outside
T ° C heating flow
obtained only if the heating temperature is set from the user interface (Tset CH = 80 ° C)
20
30
30
30
30
30
30
30
30
30
30
30
30
18
31
31
32
32
32
33
34
34
35
35
36
37
16
31
32
33
34
35
36
37
38
40
41
42
43
14
32
34
35
36
37
39
41
43
44
46
48
50
12 32 35 36 38 40 42 44 47 49 52 54 56
10
33
36
38
40
42
45
48
51
54
57
60
63
8
34
37
40
42
44
48
52
55
59
62
66
70
6
34
38
41
44
47
51
55
59
64
68
72
76
4
35
40
43
46
49
54
59
64
68
73
78
80
2
35
41
44
48
52
57
62
68
73
79
80
80
0
36
42
46
50
54
60
66
72
78
80
80
80
-
2
37
43
48
52
56
63
70
76
80
80
80
80
-
4
37
44
49
54
59
66
73
80
80
80
80
80
-
6
38
46
51
56
61
69
77
80
80
80
80
80
-
8
38
47
52
58
64
72
80
80
80
80
80
80
-
10
39
48
54
60
66
75
80
80
80
80
80
80
-
12
40
49
56
62
68
78
80
80
80
80
80
80
-
14
40
50
57
64
71
80
80
80
80
80
80
80
-
16
41
52
59
66
73
80
80
80
80
80
80
80
-18 41 53 60 68 76 80 80 80 80 80 80 80
-
20
42
54
62
70
78
80
80
80
80
80
80
80
-
22
43
55
64
72
80
80
80
80
80
80
80
80
-
24
43
56
65
74
80
80
80
80
80
80
80
80
-
25
44
57
66
75
80
80
80
80
80
80
80
80
-
28
44
59
68
78
80
80
80
80
80
80
80
80
-
30
45
60
70
80
80
80
80
80
80
80
80
80
Example of setting parameter SP 05:
- If the outside temperature = 0 ° C and the parameter Sp 05 = 10, then the flow temperature CH = 50 ° C.
Table 2 - Use of external sensor on the CH floor circuit.
SP05 1 5 10 RECOMANDED SET 15 20 25 30 33
T ° C
outside
T ° C heating flow obtained only if the heating temperatur
e is set from the user
interface (Tset CH = 45 ° C)
10
16
20
25
30
35
40
45
45
0
17
25
35
45
45
45
45
45
-
10
18
30
45
45
45
45
45
45
-
19
18
34
45
45
45
45
45
45
For example (the graph next to Fig. 5.14):
- if desired Sa maximum of 70 ° C for the CH in the interface of the user (red linefrom the graph) this can only be achieved if SP
05> 8, for external temperatures of maximum -30 ° C (SP05 = 8 column in the table).
External temperature °C
Temperature CH °C
Fig. 5.14

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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5.10 Filling and emptying the installation
Warning!
The heating system must be washed before filling;
Do not use antifreeze or corrosive agents as an additive! The company KÖBER SRL - SUCURSALA VADURI does not
assume responsibility for the damages caused by this cause.
Warning!
The filling of the installation is done only with the fuel valve closed.
Danger of explosion when starting the boiler.
When the boiler is switched on, the welcome message "- -" will be displayed immediately, followed by the boiler entering error
E88 ( ).
This will indicate the need to carry out the PIF (Commissioning) operation by one of the service companies authorized
according to the legislation in force and approved by us KOBER SRL. For this, contact one of the partner companies within your
domicile, indicated in the list inside the Warranty Certificate.
Removing the boiler from error E88 is done as follows:
- break the boiler seal (self-destruct label on the left side / boiler cover).
- remove the front cover of the boiler (chapter 5.9.1);
- the electronic box is folded down;
- unscrew the screws (8), remove the connecting electrical cable (bridge);
- after removing the connecting cable, the boiler is fully functional and all boiler functions are available;
- the front cover is mounted.
Warning!
In order to grant the warranty, the removal of the boiler from error status E88 is allowed only to the personnel
authorized and approved by KÖBER SRL.
To fill the installation, the following operations are performed:
1. the filling valve (fig. 7.2) of the boiler and those of the district heating / domestic water installation are opened;
2. the boiler is supplied with electricity;
3. the pump aerator is opened;
4. the boiler is charged with a pressure of around 0.8 bar, indicated on the display, and the boiler will automatically
initiate the "self-ventilation" function on CH for 450 seconds if no key is pressed as follows: 30 seconds (pump ON),
followed by 20 seconds pump OFF. The cycle is repeated 9 times;
5. after performing the 450-second ventilation cycle, check the tightness of the entire system (if there are leaks, the
problems are remedied);
6. the ventilation of the boiler is continued by manually activating the ventilation module, for activation long press the J7
key ( ) and the pump will start, the boiler being in the OFF (Stand-by) state, for deactivation press the J7 key
( ) or by starting the boiler from the POWER key;
7. adjust the pump operating stage (5, 6 or 7m) depending on the installation (see chap. 7.11);
8. the filling of the installation is continued, with the ventilation function turned up to 1.1-1.5 bar;
9. the tightness of the entire system is checked. If there are losses, the problems are remedied;
10. the radiators are ventilated;
11. 2-3 ventilation cycles of 50-60 seconds are performed until no more noises are heard in the installation, following the
steps described above;
12. check the pressure in the installation indicated on the display / manometer. If necessary, fill it with thermal agent,
following the steps above.
Warning!
Check the correct operation of the pump with non-fueled boiler.
Operation of the boiler with the pump blocked can lead to irreparable damage to the primary heat exchanger fig.
7.3.
The operating condition of the pump is MANDATORY to check when starting up, with the front cover of the boiler removed, by
checking the indication of the pump LEDs and activating the VENTILATION function.
If the VENTILATION function cannot be executed, because the pump LEDs indicate the status' PUMP LOCKED '' (see chap. 7.9 -
table 7.6 '' Pump error codes), then it is necessary to unblock the pump as follows (fig. 7.4):
- with the help of a Phillips screwdriver (PH2), press the rotor screw (movement 1), then unlock the rotor by turning left, right
(movement 2).
FIG. 7.2
Fig.7.3
OPEN
Filling tap

USER MANUAL CENTRAL HEATING BOILER TYPE C38GC35-BA
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After unlocking the pump rotor, continue with the correct
ventilation of the installation, by performing the steps described
above.
Warning!
Improper ventilation of the installation can lead to
irreparable damage to the primary heat exchanger -
see figure 7.3.
Failure to properly install the installation will void the warranty!
Indication!
The recommended pressure on the district heating
circuit is 1.5 ÷ 2 bar.
Emptying the boiler
Emptying the boiler involves the following:
- turn off the boiler from the Power key and disconnect the
power supply, close the gas valve;
- close the tap on the district heating and cold water inlet;
- open the filling valve (fig.7.2), after which the domestic hot water consumption point opens.
Warning!
Danger of scalding when emptying the boiler.
Fig.7.4

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6 ELECTRONIC CONTROL MODULE - USER INTERFACE, OPERATING CYCLE
6.1
The control paneel
LMC1112-C15
The control panel LMC1112-C1-15 (fig.6.1) allows the visualization and modification of the parameters that define the
operation of the boiler. Is made of:
8 keys (J1 ÷ J8) - tab.6.1
the LCD type display, where the messages (graphic symbols) of communication with the control panel are displayed. The
meaning of the 10 types of symbols (S1 ÷ S10) is presented in tab. 6.2;
Table 6.1:
Control panel keys
Key Annotation Description:
J1 CH +
Used to increme
nt the temperature set on district heating or to navigate the installation
submenu
J2 CH -
Used to decrease the temperature set on district heating or to navigate the installation
submenu
J3 DHW +
Used to increment the temperature set on the DHW or the v
alue of the current parameter in the
installation submenu
J4 DHW -
Used to decrease the temperature set on the DHW or the value of the current parameter in the
installation submenu
J5 POWER Used to turn on / off the boiler
J6
RESET
Used to reset the ele
ctronic command and control board from an error state
J7
Used to change the winter / summer mode
Activates / deactivates the boiler ventilation function (long press in standby mode)
J8
LIGHT
Used to enable / disable screen lighting
Table 6.2: Description of graphic symbols in the LCD display area
Key Annotation Description:
S1
Displays temperature (° C), set value, parameter values, informational values, various messages
("On", "SP", "Co", "EI", "SI", etc.)
S2 Displays informative values, parameter values, pressure
S3 Indicates the status of the boiler (Off = OFF = active symbol, On (ON) = inactive symbol)
S4 Indicates the presence of flame
S5 Indicates whether the set operating mode is SUMMER (active symbol)
S6 Indicates whether the set operating mode is WINTER (active symbol)
S7
The symbol is displayed continuously means that the boiler works on district heating. The symbol
is displayed flashing when the temperature is set to district heating
S8
If the symbol is displayed continuo
usly it means that the boiler operates on DHW. The symbol
flashes when the DHW temperature is set
S9 Indicates that the S2 symbol displays the pressure value in the system (active symbol)
S10
Indicates that there was an unsaved change in the paramete
rs in the EEPROM memory
(flashing)
6.2
Description of the functions and graphical contexts displayed by the LMC1112-C15 control panel
6.2.1 Graphic context - Display error E88
When the boiler is switched on, the welcome message "- -" will be displayed on the control panel, followed by the standby
status ( ). When you press the J5 (POWER) key, the control panel will immediately enter error E88 ( ).
This will indicate the need to perform the PIF (Commissioning) operation by one of the service companies authorized
according to the legislation in force and approved by us KÖBER SRL. For this, contact one of the partner companies within your
domicile, indicated in the list inside the Warranty Certificate.
Fig. 7.5 Control panel LMC1112
-
C15