Viadrus VIADRUS CLAUDIUS K 2 L5X Instruction Manual

VIADRUS CLAUDIUS K 2
Manual for boiler operation and installation
GB_2016_35
GB_2016_43

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Content p.
1 Manufactured boiler versions ................................................................................................................................3
2 Boiler Uses and Advantages.................................................................................................................................3
3 Specifications ........................................................................................................................................................4
4 Boiler description...................................................................................................................................................7
4.1 Boiler construction ........................................................................................................................................7
5 Storage heater VIADRUS OV - H 100...................................................................................................................8
6 Placement and installation...................................................................................................................................10
6.1 Regulations and guidelines.........................................................................................................................10
6.2 Positioning options......................................................................................................................................11
6.3 Delivery and accessories............................................................................................................................11
6.4 Boiler Installation.........................................................................................................................................12
6.5 Wiring diagram............................................................................................................................................13
7 Commissioning....................................................................................................................................................15
7.1 Connection to the heating system and filling with water.............................................................................15
7.2 Gas connection...........................................................................................................................................16
7.3 Connection to the mains.............................................................................................................................16
7.4 Condensate drain........................................................................................................................................16
7.5 Flue gas exhaust.........................................................................................................................................16
7.6 Pressure losses of flue gas exhaust components for the boiler VIADRUS CLAUDIUS K2......................18
7.7 Boiler commissioning..................................................................................................................................18
7.8 Boiler settings .............................................................................................................................................19
8 Boiler operation by user.......................................................................................................................................20
8.1 General description.....................................................................................................................................20
8.2 Display description......................................................................................................................................20
8.2.1 Energy saving .........................................................................................................................................21
8.3 Settings overview........................................................................................................................................21
8.4 Error messages...........................................................................................................................................24
8.5 Faults ..........................................................................................................................................................24
9 Maintenance........................................................................................................................................................25
9.1 Checking the device ...................................................................................................................................25
10 IMPORTANT NOTICE....................................................................................................................................26
11 Instructions for product disposal after its service life......................................................................................26
12 Warranty and liability for defects.....................................................................................................................27

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Dear customer,
Thank you for purchasing VIADRUS CLAUDIUS K 2 and hence your confidence in the company VIADRUS a.s.
To get used to a correct way of handling your new product, please read at first this manual for its use, particularly
Chapter no. 8 - Boiler operation by users and Chapter no. 10 - Important information. We ask you to follow further
presented information, particularly regarding required annual inspections by a professional company, thus ensuring
trouble-free boiler operation to our satisfaction.
1 Manufactured boiler versions
In the order, please specify the following order specification code:
VIADRUS CLAUDIUS K 2 x1x2 x3
x
1
Gas valve:
L:
produced by SIEMENS
x
2
Size:
3:
3-section version
5: 5-section version
x
3
Equipment:
1:
without set three-way valve with pump
3: with three-way valve and pump
5: without set three-way valve with pump
2 Boiler Uses and Advantages
Condensing boiler VIADRUS CLAUDUS K 2 is intended for combustion of low pressure natural gas. The size of the
condensing boiler is suitable for heating of houses, recreation facilities and also for reconstruction of heat sources
in individual flats.
Heat output of the condensing boiler is 3.8 to 24 kW (K 2 L3X) and 7.8 to 48.1 kW (K 2 L5X).
The boiler body consists of castings made from special aluminium alloy. Individual sections are connected by
means of silicon rings and tightened by threaded bars. The maximum working overpressure of the boiler is 250 kPa
(2.5 bar). The body is tested by the test overpressure of 600 kPa (6 bar).
Combustion mixture is mixed in a mixer in a predetermined ratio of air - gas in its control range.
Water volume of the three-section boiler body is 9 l and the water volume of the five-section body is 13 l.
The efficiency of the boiler body at a temperature gradient of 50/30 °C ranges from 102 to 108% depending on the
desired performance.
Boiler advantages:
• Low gas consumption.
• High combustion efficiency.
• Continuous output modulation.
• Easy operation and maintenance.
• The boiler enables connection to a storage hot service water heater and guarantees its preferential heating.
• Reliability of regulation and safety elements.
• Low weight.
• Automatic detection of faults.
• Independent time program also for HW.
• Equithermal boiler regulation.

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3 Specifications
Tab. №. 1 Sizes, operation temperature and electrical variables
K 2 L3X
K 2 L5X
Fuel type [-] ZP ZP
Appliance category [-] I
2H
I
2H
Weight [kg] 69 95
Water content [l] 9 13
Boiler dimensions - width (L2) [mm] 502 587
- depth [mm] 548 548
- height [mm] 956 956
Ø connection of the combustion air [mm] 80 80
Ø smoke socket [mm] 80 110
Maximum working water overpressure [kPa]/[bar] 250/2.5 250/2.5
Testing water overpressure [kPa]/[bar] 600/6 600/6
Dissipation factor [-] 11.37 6.85
Maximum allowable operating temperature [°C] 85 85
Connecting fuel overpressure G20 [mbar] 20 20
Noise level [dB] < 55 < 55
Boiler connection
- heating water outlet [Js] 3/4“ 3/4“
- heating water outlet to the heater [Js] 3/4“ 3/4“
- return heating water inlet [Js] 3/4“ 3/4“
- return water inlet from the heater [Js] 3/4“ 3/4“
- condensate outlet [mm] Ø 25 Ø 25
- safety valve outlet [Js] 3/4“ 3/4“
- gas inlet [Js] 3/4“ 3/4“
Supply voltage 1/N/PE 230 VAC 50 Hz TN-S
Input power including pumps [W] 110 110
El. protection IP 41 41
Tab. №. 2 Heat-technical parameters
Comparative conditions 15 °C and 1013,25 mbar, dry gas
K 2 L3X
K 2 L5X
Performance B
23
,
B
53
, C
83
B
23
,
B
53
, C
83
Boiler power range [kW] 3.8 - 24 7.8 – 48.1
Rated heat output 80/60 °C [kW] 22.4 45.3
Minimum heat output 80/60 °C [kW] 3.8 7.8
Rated heat output 50/30 °C [kW] 24.3 48.1
Minimum heat output 50/30 °C [kW] 4.3 8.8
Rated heat input [kW] 23.7 47.3
Minimum heat input [kW] 4 8.1
Efficiency at rated heat output 80/60 °C [%] 97.2 97.2
Efficiency at rated heat output 50/30 °C [%] 103.1 102
Efficiency at minimum heat output 50/30 °C [%] 108.2 107.7
Volumetric flow rate of fuel [m
3
.h
-
1
] 0.408 - 2.4 0.836 – 4.877
Flue gas mass flow [kg.h
-
1
] 5.2 - 39.2 12.26 - 80.85
NOx Class [-] 5 5
Flue gas temperature [°C] 30 - 85 40 - 85
Fig. №. 1 Dependence of the pressure loss on flow
3 sect.
5 sect.

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Information requirements relating to boiler heaters for space heating, boiler combined heaters and
cogeneration heaters for space heating
Model/Models: VIADRUS CLAUDIUS K2 L3X
Condensing boiler: YES
Low-temperature boiler: NO
Boiler type B1: NO
Cogeneration heater for space heating: NO If YES, featured with an auxiliary heater:
Combined heater: NO
Item
Designatio
n
Value
Unit
Item
Designatio
n
Value
Unit
Rated heat output Prated 22.7 kW
Seasonal energy efficiency of
heating (***) ƞ
s
92 %
For the boiler heaters for space heating and boiler
combined heaters: useful heat output For the boiler heaters for space heating and boiler combined heaters: useful efficiency
At rated heat output and high
temperature mode (*) P
4
22.7 kW At rated heat output and high
temperature mode (*) ƞ
4
87.6 %
At 30% of rated heat output and
low temperature regime (**) P
1
4.3 kW At 30% of rated heat output and
low temperature regime (**) ƞ
1
97.6 %
Consumption of auxiliary electrical power: Other items:
At full load el
max
0.034 kW Heat loss in standby mode P
stby
0.088 kW
At partial load el
min
0.013 kW Electricity consumption of the
pilot burner P
ign
- kW
In standby mode P
SB
0.003 kW Emissions of nitrogen oxides NO
x
12 mg/
kWh
Contact information
VIADRUS a.s.
Bezručova 300
Bohumín
735 81
(*) High temperature mode for condensing boilers mean return temperature of 60 °C at the inlet to the heater and the inlet
temperature 80 °C at the outlet of the heater.
(**) Low temperature for condensing boilers mean return temperature of 30 °C, for low temperature boilers it is 37 °C, and for other
heaters it is 50 °C (at the inlet of the heater).
(***) For seasonal energy efficiency, the value is based on the gross calorific value according to EU regulation no. 813/2013

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Information requirements relating to boiler heaters for space heating, boiler combined heaters and
cogeneration heaters for space heating
Model/Models: VIADRUS CLAUDIUS K2 L5X
Condensing boiler: YES
Low-temperature boiler: NO
Boiler type B1: NO
Cogeneration heater for space heating: NO If YES, featured with an auxiliary heater:
Combined heater: NO
Item
Designatio
n
Value
Unit
Item
Designatio
n
Value
Unit
Rated heat output Prated 46.1 kW
Seasonal energy efficiency of
heating (***) ƞ
s
93 %
For the boiler heaters for space heating and boiler
combined heaters: useful heat output For the boiler heaters for space heating and boiler combined heaters: useful efficiency
At rated heat output and high
temperature mode (*) P
4
46.1 kW At rated heat output and high
temperature mode (*) ƞ
4
87.8 %
At 30% of rated heat output and
low temperature regime (**) P
1
8.8 kW At 30% of rated heat output and
low temperature regime (**) ƞ
1
97.8 %
Consumption of auxiliary electrical power: Other items:
At full load el
max
0.060 kW Heat loss in standby mode P
stby
0.094 kW
At partial load el
min
0.013 kW Electricity consumption of the
pilot burner P
ign
- kW
In standby mode P
SB
0.003 kW Emissions of nitrogen oxides NO
x
13 mg/
kWh
Contact information
VIADRUS a.s.
Bezručova 300
Bohumín
735 81
(*) High temperature mode for condensing boilers mean return temperature of 60 °C at the inlet to the heater and the inlet
temperature 80 °C at the outlet of the heater.
(**) Low temperature for condensing boilers mean return temperature of 30 °C, for low temperature boilers it is 37 °C, and for other
heaters it is 50 °C (at the inlet of the heater).
(***) For seasonal energy efficiency, the value is based on the gross calorific value according to EU regulation no. 813/2013.

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4 Boiler description
4.1 Boiler construction
The heat exchanger of the condensing boiler consists of a front, middle (the number depends on the size of the
boiler) and the rear section. These castings are connected by means of silicon rings and tightened by threaded
bars. This boiler is equipped with a premixing burner. Combustion mixture is mixed in a mixer in a predetermined
ratio of air - gas at the whole performance range. Air is supplied to the mixer using the modulation ventilator. The
boiler is constructed for heating with preferred heating of HW. To heat HW, the manufacturer recommends
combination with the water heater.
Further, the boiler is equipped with LMS automatics and a gas valve. LMS automatic is an electronic control and
ignition automatics designed for gas central heating boilers with the modulated ventilator and pre-mixing burner. if
the boiler is to be controlled equithermally, it is necessary to connect the outdoor sensor. In this case, we
recommend using one of the communication devices, see chap. 6.3.
To increase the number of heating circuits, expansion module can be used according to project documentation.
Combustion air can be fed and flue gas can be exhausted to the chimney or through the wall.
The boiler is an appliance of B or C version.
1 Condensing body
2 Burner plate with burner
3 Ignition electrode (guard electrode)
4 Supply of the mixture to the burner
5 Fan
6 Gas valve
7 Pump with a PWM control
8 Three-way valve
9 Condensate drain
10 Exhaust piping
11 Suction piping
12 Inlet pipe to the boiler
13 Outlet pipe from the boiler
14 Manometer check valve
15 SIEMENS display
16 Reset button
17 Manometer
18 Console electro
19 Control panel SIEMENS LMS
20 Housing electro
21 Boiler frame
22 Right side casing part with insulation
23 Left side casing part with insulation
24 Upper casing part with insulation
25 Rear casing part with insulation
26 Front casing part
27 Outlets
28 Blinds
Fig. №. 2 Assembly of the boiler

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Fig. №. 3 Location mix strainer in the gas pipeline of the burner K 2 L5X
5 Storage heater VIADRUS OV - H 100
Water heater VIADRUS OV – H 100 is a pressure device adapted to operate at a maximum water pressure of 0.6
MPa (6 bar). Hot service water heater is a device designed for heating and storing hot water.
The main part of the heater is a vessel made of steel sheet coated with a layer of enamel. The heater is equipped
with a heating coil with large heat exchange surface, which ensures fast heating of large quantities of water. All
connections are located in the upper part of the heater and are terminated with an external thread. The heater also
offers the possibility of connecting a circulation pump for circulating hot water, and s temperature sensor. There is
an outlet at the bottom part of the heater through which the vessel can be drained. The heater is equipped with an
additional anticorrosive device in the form of a magnesium anode whose function is based on the utilization of the
electrochemical potential difference between the anode and the tank. The magnesium anode is placed in the upper
part in the plug 2”. Thermal insulation of the heater is made of polyurethane foam free from freon, which minimizes
heat loss. An electric heater can be installed in the heater.
Tab. №. 3 Technical parameters
Technical parameters VIADRUS OV – H 100
Volume l 100
Maximum allowable temperature °C 100
Maximum allowable pressure bar 6
Heat exchanger surface m
2
1.2
Heat exchanger volume l 5.6
Consumption of heating water from central heating m
3
/h 2.5
Constant efficiency (70/10/45
o
C) l/h 700
Output kW 29
Dimen
sions
A mm 140
B mm 60
C mm 40
D mm 100
E mm 120
Device height L 990
Tank dimensions (without insulation) Ø 400
Tank dimensions (with insulation) mm 455x455
Insulation of soft polyurethane foam mm 30
gas
inlet
gas inlet
1. Complete burner
2. Extension tube
3. Gasket Ø 83
4. mix strainer
5. Screw M5
6. Washer 5.3
7.
Nut M5

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Connections
Cold water / hot water R 3/4”
Circulation R 3/4”
Central heating circulation (supply, return pipeline) R 3/4”
E-socket (heating coil) R 5/4”
Sensor housing R 3/8"
Thermometer internal thread 1/2”
Water drain 3/4"
Magnesium anode An. stopper 2”
Weight (empty) kg 57
Fig. №. 4 Water heater VIADRUS OV - H 100
ANODE PROTECTION
DRAIN

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6 Placement and installation
6.1 Regulations and guidelines
a) for the heating system
CSN 06 0310 Heating systems in buildings – Design and installation
CSN 06 0830 Heating systems in buildings – Safety devices
CSN 07 7401 Water and steam for heating equipment with steam working pressure up to 8 MPa
EN 15502-1 Gas-fired central heating boilers - Part 1: General requirements and tests
EN 15502-2-1 Gas-fired central heating boilers - Part 2-1: Specific standard for boilers of design C and
designs B2, B3 and B5, with a nominal heat input not exceeding 1,000 kW
EN 677 Gas-fired central heating boilers – Specific requirement for condensing boilers with a
nominal heat input not exceeding 70 kW
b) for chimneys
CSN 73 4201 Chimneys and flues – Design, implementation and connection of fuel appliances
c) regarding the fire regulations
CSN 06 1008 Fire safety of heat installations.
EN 13501 – 1 + A1 Fire classification of construction products and building elements – Part 1: Classification
using test data from reaction to fire tests
d) for the system HW heating
CSN 06 0320 Thermal systems in buildings – Hot water preparation –Designing and Installation
CSN 06 0830 Heating systems in buildings – Safety devices
CSN 75 5409 Internal Water Supply
e) for the electricity network
CSN 33 0165 Electrical regulations. Marking the conductors with colours or digits. Implementing
regulations.
CSN 33 1500 Electrical regulations. Revision of electrical devices.
CSN 33 2000–1 ed. 2 Low-voltage electrical installations – Part 1. Basic terms of determining the fundamental
characteristics of the definition.
CSN 33 2000–4–41 ed. 2 Low-voltage electrical installations – Part 4-41, Protective measures to ensure safety –
Protection against electric shock
CSN 33 2000-5-51 ed. 3 Low-voltage electrical installations – Part 5-51. Selection and erection of electrical
equipment – Common rules.
CSN 33 2000-7-703 ed.2 Electrical installations of buildings – Part 7-703: Requirements for special installations or
locations – Rooms and cabins containing sauna heaters.
CSN 33 2130 ed. 2 Low-voltage electrical installations – Internal electric distribution lines.
CSN 33 2180 CSN electric engineering regulations. Rules for installation of electrical apparatus and
appliances.
ČSN 34 0350 ed.2 Safety requirements for flexible cords and cables.
EN 60079-10-1 Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas
atmospheres.
EN 60079-14 ed.3 Explosive atmospheres – Part 14: Electrical installations design, selection and erection.
EN 60335 – 1 ed.3 Household and similar electrical appliances - Safety – Part 1: General requirements.
EN 60335-2-102 Household and similar electrical appliances - Safety – Part 2 – 102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections.
EN 60 445 ed. 4 Basic and safety principles for man-machine interface, marking of terminals of electrical
equipment, ends of cables and wires.
f) for the gas distribution
EN 1775 Gas supply – Gas pipework for buildings – Maximum operating pressure <= 5 bar –
Functional recommendations.
EN 12007-1 Gas supply systems – Pipelines for maximum operating pressure up to and including 16
bar – Part 1: General functional recommendations.
EN 12007-2 Gas supply systems – Pipelines for maximum operating pressure up to and including 16
bar – Part 2: Specific functional requirements for polyethylene (MOP up to and including
10 bar)
EN 12007-3 Gas supply systems – Pipelines for maximum operating pressure up to and including 16
bar – Part 3: Specific functional requirements for steel.
EN 12007-4 Gas supply systems – Pipelines for maximum operating pressure up to and including 16
bar – Part 4: Specific recommendations concerning reconstructions.
CSN 07 0703 Boiler rooms with gas fuel-operated equipments
CSN 38 6405 Gas equipment, operation principles.

11
Act No. 458/2000 Coll. The Act on business conditions and the performance of state administration in the
energy sectors and on amendments to certain laws (Energy Act)
6.2 Positioning options
When installing and using the boiler, all
requirements of CSN 06 1008 must be
complied with.
Positioning and connection of the boiler must
correspond to the project documentation. Flue
gas exhaust must comply with the applicable
regulations (Technical Regulations TPG 800
01) and the project documentation.
The space near and above the boiler must be
equal to min. 0.2 m and min. 1 m before the
boiler for the assembly and repair. The
manufacturer recommends to mount these
products into closed heating systems.
The boiler may be installed in living rooms.
It can be situated in the basic environment
according to CSN 33 2000-1 ed. 2.
K 2 L3X
K 2 L5X
L (mm) 502 587
Fig. №. 5 Main dimensions of the boiler
Boiler positioning with regard to fire regulations:
Safe distance from flammable materials:
−When installing and operating the boiler it is necessary to keep the safe distance of 200 mm from flammable
materials A1, A2, B and C (D);
−For easily flammable materials of flammability class E (F), which burn quickly and by themselves also after the
ignition source removal (e.g. paper, cardboard, asphalt and tar boards, wood and fibreboards, plastics, flooring
materials) the safe distance is doubled, it means that the distance is 400 mm;
−The safe distance is to be doubled also in case when the fire reaction class is not proven.
Tab. №. 4 Fire reaction class
Fire reaction class
Examples of building materials and products classified in reaction to fire class
(selection from CSN EN 13501-1+A1)
A1
– non-combustible
material granite, sandstone, concrete, bricks, ceramic tiles, mortars, anti-fire plasters,…
A2
– limited combustibility
material akumin, izumin, heraklith, lignos, boards and basalt felt, fibreglass boards,…
B
– difficult to ignite Beech, oak, hobrex boards, plywood, werzalit, Formica, sirkolit,…
C (D)
– medium
inflammable pine, larch, spruce wood, chipboard and cork boards, rubber flooring,…
E (F)
– easily flammable Asphalt board, fibreboards, cellulose materials, polyurethane, polystyrene, polyethylene, PVC,...
6.3 Delivery and accessories
The boiler VIADRUS CLAUDIUS K 2 is supplied as assembled on a pallet, packed in a carton cover and foil
protected.
Standard accessories to all boiler variants:
Operating instructions and installation manual, which includes a warranty card
The list of contractual service organizations
For the variant CLAUDIUS K 2 LX3, boiler sensor QAZ 36
Recommended accessories to all boiler variants:
One of spatial communication devices Siemens QAA74, QAA75, QAA55, QAA58 (wireless) QAA78 (wireless) 1
pc
Outside sensor QAC 34/101 1 pc
Recommended accessories are not included in the basic price of the boiler.

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6.4 Boiler Installation
According to the marked outlets, the boiler is connected to the heating system including HW (if used) and gas
distribution as shown in Fig. No. 6. Condensate drain should be connected in compliance with the applicable
standards CSN and EN. Further, the flue gas exhaust is connected according to the project.
K 2 L3X
K 2 L5X
L (mm) 502 587
L1 (mm) 213.5 293.5
L2 (mm) 105.5 183.5
V1 (mm) 426 440
diam. D (mm) 80 110
Fig. №. 6 Rear view of the boiler
1 Heating water outlet from the boiler
(if a water heater, it is necessary to
make connections via T - piece
behind the boiler)
2 Cable bushings
3 Bushings for the sensor
4 Return water from the central heating
5 Output from the safety valve
6 Condensate drain
7 Return water from the water heater
8 Gas inlet
9 Intake flange (diameter 80 mm)
10 Flue gas output (diam. D mm)

13
6.5 Wiring diagram
Fig. №. 7 Circumferential diagram
X12, 13 Programmable connectors X15 PWM pump control connector X30 Control panel connector Y3 Three-way valve Protective clamps
LEGEND: A1 Control unit A2 Kindling transformer with gas valve A3 Control panel AVS37 B2 Boiler temperature sensor - output B3 HW temperature sensor - output B7 Boiler temperature sensor - input B9 External temperature sensor B38 HW temperature sensor - input BTr Room thermostat E1 Kindling electrode E2 Monitoring electrode MV1 Fan
MV1 Fan Q1 Pump X1a Power supply connector 230В
X1b Three-way valve and selected output connector X1f Fan and pump power supply connector X2 Protective thermostat connector X4 Temperature sensors and Reset button connector X5a Selected inputs connector X6a Selected inputs connector X7a Connection of room devices (QAA 74, 75…) X8 PWM fan control connector X10a PWM/1-10Вoutputs connector

14
Fig. №. 8 Wiring diagram
CONDUCTORS COLORS bn (brown) bu (blue) bk (black) gn (green) gnye (green/yellow) rd (red) ye (yellow)
LEGEND: A1 Control unit A2 Kindling transformer with gas valve A3 Control panel AVS37 B2 Boiler temperature sensor - output B3 HW temperature sensor - output B7 Boiler temperature sensor - input B9 External temperature sensor B38 HW temperature sensor - input E1 Kindling electrode E2 Monitoring electrode MV1 Fan
Q1 Pump X1a Power supply connector 230В
X1b Three-way valve and selected output connector X1f Fan and pump power supply connector X2 Kindling transformer and gas valve connector X4 Temperature sensors and Reset button connector X5a Selected inputs connector X6a Selected inputs connector X7a Connection of room devices (QAA 74, 75…) X8 PWM fan control connector X10a PWM/1-10Вoutputs connector
X11 Connector for connection of OCI 345
X12, 13 Programmable connectors X15 PWM pump control connector X17 Earth connector X18 Protective thermostat connector X30 Control panel connector X50 RVS regulator connector X54 Water pressure sensor connector Y3 Three-way valve Protective clamps

15
7 Commissioning
7.1 Connection to the heating system and filling with water
Before filling the heating system with water the system should be duly cleaned, it means that the system should be
twice filled with clean water and drained.
Water for the boiler and the heating system filling must be clear and colourless, without suspended solids,
oil and aggressive chemicals. The heating system must be filled with water that meets the requirements of
CSN 07 7401 and especially its hardness must not exceed the required parameters.
The parameters of circulating and make-up water must correspond to the following:
Tab. №. 5 The maximum permissible values of heating water according to CSN 07 7401
Recommended values
Hardness mmol/L 1
Ca
2+
mmol/L 0.3
Total Fe + Mn concentration mg/L (0,3)*
*recommended value
ATTENTION!!! The manufacturer does not recommend the use of antifreeze.
If the water hardness is unsuitable it has to be adjusted. Even the multiple heating of water with a higher hardness
does not exclude salts on the boiler body walls. Precipitation of 1 mm calcite reduces at a given point the heat
transfer from the metal to water by 10%.
During the heating season, it is necessary to maintain a constant volume of heating water in the heating system
and ensure that the heating system is vented. Water from the boiler and the heating system must never be drained
or taken for usage except for the emergency cases like repairs etc. Heating water discharge and filling with new
water increases the danger of corrosion and scaling. If it is necessary to refill water in the heating system, refill
only the cold boiler in order to avoid disruption.
Before filling the system with water, shift a three-way valve control lever into the intermediate position using a
screwdriver or manually by pulling it toward yourself slightly down (if the boiler has the option of feeder water
preparation) Fig. No. 9. After filling the heating system, dismantle the water valve drive by pushing the metal push
button and turning right. After remounting the water valve drive, the lever comes back to the position for heating the
heating system.
Lever shifted in the intermediate
position when filling the heating
system and water heater
Lever in the position for HW heating Lever in the position for heating the
heating system
Fig. №. 9 Three-way valve VC 4013
When filling the boiler with water the system must be disconnected from the mains. Bleeder valve on the boiler and
on the heating system must be open and functional. Adjust the expansion vessel to a pressure of 10 kPa
(0.1 bar) higher than the pressure required in the heating system (only for the version CLAUDIUS
K 2 L31, CLAUDIUS K 2 L33). The system is pressurized to the desired pressure of about 100 kPa (1 bar) and
again vented. For filling water, it is recommended to use a filter on the heating system inlet.
The heating system must have a sufficient number of vents. Drain valve must be installed at the lowest point of the
heating system.
The expansion tank is 8 L volume and its volume is sufficient for 150 l of water in the heating system. The
expansion tank is not mounted for the version CLAUDIUS K 2 L5X.
The system should be designed to a temperature gradient of 55/45 °C with respect to condensation use.
Condensing boiler can be used also for old self-load systems which were pre-dimensioned and thus condensation
can be efficiently used also for this system, but the system should be supplemented with a corresponding
expansion tank.

16
Condensing boiler is equipped with low energy pump with a PWM driving Wilo Yonos Para RS 15/7.5. Modulating
pump is controlled by the control unit of the boiler according to the chosen strategy.
The connection to the heating system, HW and gas is carried out through ball valves.
Fig. №. 10 Wilo Yonos Para RS 15/7.5 pump characteristics
7.2 Gas connection
Before connecting the gas pipeline to the boiler, the gas pipeline should be tested and checked. After the boiler
connection to the gas pipeline, all gas connections gas must be re-tested by a gas detector or foam solution. Inlet
natural gas pressure is 2 kPa (20 mbar).
7.3 Connection to the mains
The boiler is equipped with a movable mains supply and a plug. According to ČSN EN 60 335–1 ed. 2 Art.
7.12.4, the boiler must be positioned so that the plug is accessible.
Near the boiler, a socket 230 V/50 Hz must be placed at the distance of 1.5 meters. The socket must comply with
applicable regulations and must be checked.
7.4 Condensate drain
To drain condensate, a built-in siphon connected to a sewerage overflow is used. Before the boiler commissioning,
check whether the condensate is drained. Size of a waste PVC pipe is of Ø 16 mm.
The condensate pH is 4.5 and it can be drained into the sewer system without treatment. The boiler condensate
drain must be made so as to not prevent continuous condensate drain.
7.5 Flue gas exhaust
The boiler is made in the version B or C according to the way of flue gas exhaust and combustion air inlet. Gas
appliances for the version B suck the combustion air from the boiler room. Appliances for the version C suck the
combustion air from the outside or from the space outside the boiler room.
The boiler is supplied in a standard version. The boiler flue gas exhaust is not part of the boiler supply. It is
necessary to use special piping intended for condensing boilers with a wall thickness of 1.5 mm. It is necessary to
keep a 3% inclination to the boiler. Pressure loss for the flue gas exhaust must not exceed 150 Pa.
Glue gas exhaust and air inlet including their lengths shall be made by a designer in the technical
documentation.
The boiler must be installed only with a wind protective device which meets the requirements of EN 1856-1 (See
Annex N).
The boiler must be installed with the necessary accessories (pipeline for the combustion air supply and flue gas
exhaust).

17
Fig. №. 11 Flue gas exhaust and air intake connection options
The boiler version B and C is specified by a double digit:
- the first digit in the index relates to the possible boiler installation with regard to the way of combustion air inlet
and flue gas exhaust,
- the second digit in the index relates to the use and positioning of the built-in ventilator in the boiler. The boiler
is a boiler with a fan before the combustion chamber/heat exchanger (boiler body) and is marked with a
second digit of the index “3”.
Version B
2
Boiler version Bwithout the flue gas rectifier.
Version B
5
Boiler version Bwithout the flue gas rectifier, which is designed for connection via its own flue gas exhaust to the
protective orifice.
The chimney must be equipped with a special liner intended for the condensation boiler and a condensate drain
from the chimney.
For the boiler, it is possible to use a plastic liner with the temperature resistance of 120 °C.
Version C
8
The boiler draws combustion air from the outside and transfers it to the chimney. The combustion chamber and flue
gas ways of the appliance are gastight separated from the space in which the appliance is located.
If the flange for the air intake is used according to Fig. No. 15, the break-out plate in the rear of the boiler must be
removed. Pro the version CLAUDIUS K 2 L5X, the flue gas exhaust has a diameter of 110 mm. The air supply
diameter remains 80 mm.
The boiler is designed for connection to an individually approved and sold pipeline system for combustion air
supply and flue gas exhaust.
- The least pressure loss = 17 Pa
- The highest pressure loss = 150 Pa
- Flue gas temperature for minimum output 30 C
- Flue gas temperature for maximum output 85 °C

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7.6 Pressure losses of flue gas exhaust components for the boiler
VIADRUS CLAUDIUS K2
max. fan pressure 150 Pa
Split flue gas exhaust - flue gas K 2 L3X
VIADRUS
order code code DN Name Loss in Pa
20105 PPSB48 80 Bend 45° 1.1
20107 PPSB98 80 Bend 87° 1.7
20133 PPRM18 80 Pipe 1m 3.4
20111 PPSAS8 80 Plastic chimney head starr (set)
2.5
Split flue gas exhaust - flue gas K 2 L5X
VIADRUS
order code code DN Name Loss in Pa
PPSB41 110 Bend 45° 1.1
PPSB91 110 Bend 87° 1.7
PPRM11 110 Pipe 1m 3.4
PPSAS1 110 Plastic chimney head starr (set)
2.5
Split flue gas exhaust - intake K2 LXX
VIADRUS
order code code DN Name Loss in Pa
20105 PPSB48 80 Bend 45° 0.8
20107 PPSB98 80 Bend 87° 1.2
20133 PPRM18 80 Pipe 1m 2.5
Note: The number of components for each version depends on the location of the boiler.
For the boiler, the flue gas exhaust by ALMEVA is approved see accessories in the price list of VIADRUS a.
s. www.viadrus.cz
In the case of an assembly of two or more boilers in a cascade we recommend contacting the company
Almeva www.almeva.cz for the offer and calculation of the relevant flue gas exhaust.
7.7 Boiler commissioning
The entire installation must comply with regulations related to this equipment. The boiler must be compatible with
local connecting conditions (check the boiler parameters with those on the nameplate). Putting the boiler in
operation may only be performed by organizations authorized and trained by the manufacturer. The
minimum pressure in the heating system is 80 kPa (0.8 bar). It is necessary to open all closures and check whether
gas leaks. Connect the boiler to the mains. Since the boiler is not equipped with a main switch, the boiler will start.
Check the gas distribution behind the gas valve. Check the safety valve functionality. It is also necessary to check
the pump operation. Check the functionality of the three-way valve (if used). During the boiler operation it is
necessary to check the condensate drain both from the boiler and from the chimney liner.
During the first boiler commissioning it is needed to train users in accordance with these instructions and
pass this manual to the user with the confirmation of the commissioning.
It is also required:
- to check revisions prior to commissioning,
- to check the water leakage,
- to check regulation and safety elements.

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7.8 Boiler settings
The product meets the values for “Green product”. The specific measured values depend on the type of connection
of the combustion air supply and flue gas exhaust to a given appliance. Therefore, when the boiler commissioning,
CO
2
value should be checked or adjusted. The gas valve is factory set to CO
2
value in the flue gas in the range
from 8.4 to 8.8%.
Max. CO value must be to 100 mg/m
3
converted to 3% oxygen.
Fig. №. 12 CLAUDIUS K 2 L setting
1. Use the control knob to select the symbol and confirm by pressing the control knob. The display shows the
line “Special Operations” (chimney sweep function).
2. Use the control knob scroll to the line “Off”, confirm by pressing the control knob and then using the control
knob select the line “ON” and confirm again.
3. On the newly displayed line “Burner output” select “Max. heating load” using the control knob and confirm.
4. The boiler will heat at the rated output.
5. Unscrew the plug and insert the probe of the flue gas analyser in the flue gas measuring point (see Fig. No. 16
- Pos. 10).
6. Check the amount of CO
2
in the flue gas which must be in the range of 8.4 to 8.8%. The recommended value
is 8.5%.
7. Wait about 120 seconds until the boiler operation gets stabilized and check or adjust the CO
2
max. value using
the CO
2
max. regulating screw (Fig. no. 16 pos. 6).
8. On the line “Burner output” select “Partial performance” using the control knob and confirm.
9. Wait about 120 seconds until the boiler operation gets stabilized and check or adjust the CO
2
min. value using
the CO
2
min. regulating screw (Fig. no. 16 pos. 7).
10. When turning the adjusting screw clockwise, theCO
2
volume increases, when turning the adjusting screw
counter-clockwise, the CO
2
volume decreases.
11. Screw the cover of the gas valve adjusting screw, remove the flue gas analyser probe and screw the plug into
the flue gases measuring point (watch its tightness).
12. After the adjustment, turn off the chimney sweep function.
Note: For the boiler version K 2 L3X, the slide ø 7 mm is positioned at the output of the gas valve.
1 Gas supply to the valve
2 Fan
3 Mixer
4 Gas supply to the mixer
5 Gas valve
6 Adjusting screw CO
2
max
7 Adjusting screw CO
2
min
8 Measuring point for the gas output pressure 1
9 Measuring point for the gas input pressure
10 Measuring point for the gas output pressure
11 Measuring point for the flue gas

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8 Boiler operation by user
8.1 General description
The boiler is equipped with a control unit LMS14. To set the parameters, use the display AVS37. For the proper
operation of the boiler, it is important to observe the hydraulic connection. For these purpose, design
documentation is prepared. The boiler is factory set so that it heats to the set temperature of the boiler (parameter
742). Switching is via a jumper at the input H5. When connecting the switching room unit to the input H5, the
jumper should be removed.
It is also recommended to use an outdoor sensor, due to weather-compensated heating and time programs use.
Further, we recommend using a communication room device according to the menu, see chap. 6.3.
Using the expansion modules, the control unit can manage up to 3 mixed heating circuits, hot water, cascade,
solar, pool, wood-fired boiler etc. (see VIADRUS design documents).
Another possible method of the boiler switching boiler is using 0 - 10 V via the input H1. The boiler is then only a
heat source.
8.2 Display description
Press the button OK (E) to enter the setup mode, where you can move through the menu or adjust the value of the
parameter using the control knob (D). Press the OK button to enter the desired menu or parameter, and confirm the
selected parameter value.
A
B
C
H
D
E
F
G
I
J
Fig. №. 13
A Operation mode switch FV - OFF/ON for the HW heating
B RESET button - burner fault unblocking (press for about 3 s)
C ESC button - returning one step back in the menu (the selected value is not stored)
D Room temperature adjustment knob - room temperature option or selection in the menu
E Confirmation button - shifting one step forward in the menu and confirmation of the selected value
F Manual operation button - the boiler running at a preset temperature of 60 °C, all the pumps are running, the
mixer is not controlled - the display shows the symbol .
G Chimney sweep function button - after short pressing, the boiler enters the emission measurement mode. This
button is intended for an authorized service technician.
H Operation mode switch for the heating circuits:
- operation according to preset time mode (transition to summer mode depending on the outdoor
temperature is active)
- continuous operation at nominal set room temperature
- continuous operation at setback set room temperature
- maintaining the anti-frost desired room temperature
I Display
J Info button - information about the current state of the boiler, heating circuits, HW and error messages.
A Feed water operating
mode switch
B RESET button
C ESC button
D Room temperature
adjustment knob
E Confirmation button OK
F Manual operation button
G Chimney sweep function
button
H Operation mode switch for
the heating circuits
I Display
J Info button