Hoval Uno-3 95 Manual

Subject to modi cations | EN
Technical information
Assembly instructions
4 205 116 / 02 - 02/14
Hoval products must be installed and commissioned only
by appropriately qualied experts. These instructions
are intended exclusively for the specialist. Electrical
installations may only be carried out by a qualied
electrician.
Uno-3 (95-125) boilers are suitable and licensed for
use as heat generators for hot water heating systems
with a permissible ow temperature of up to 100 °C1).
They are designed for closed-circuit systems, but can
also be installed in open systems as per EN 12828.
1) See technical data
Uno-3 (95-125)
Oil/gas boilers
These instructions are applicable to the
following types:
7-Uno-3 (95,110,125)
7-Uno-3 b-i* (95,110,125)
* = Burner integrated

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4 205 116 / 02
Table of Contents
1 Important information
1.1 Other instructions................................................................................................................................... 3
1.2 Safety information................................................................................................................................... 3
1.3 Regulations, official approvals .............................................................................................................. 3
1.4 Guarantee ................................................................................................................................................ 4
2. Installation
2.1 Setting up, levelling ................................................................................................................................ 5
2.2 Fitting the heat insulation ...................................................................................................................... 6
2.3 Fitting the casing .................................................................................................................................... 8
3 Technical information
3.1 Description of the boiler....................................................................................................................... 10
3.1.1 The Uno-3 (95-125) complies with the following directives + standards ................................................ 10
3.2 Technical data Uno-3 (95-110) for Switzerland................................................................................... 11
3.3 Technical data Uno-3 (110,125) for all other countries...................................................................... 12
3.4 Dimensions............................................................................................................................................ 13
3.5 Dimensions without heat insulation and casing (transport dimensions)........................................ 13
4. Installation
4.1 Boiler room requirements .................................................................................................................... 14
4.2 Connection of the flue gas system and flue duct dimensions ......................................................... 14
4.3 Fitting the burner .................................................................................................................................. 16
4.3.1 Sound insulation...................................................................................................................................... 16
4.4 Fuel......................................................................................................................................................... 17
4.5 Electrical connection............................................................................................................................ 17
4.5.1 Electrical connection of the burner.......................................................................................................... 17
4.6 Flue gas regulator set........................................................................................................................... 17
4.6.1 Flue gas and performance diagrams ...................................................................................................... 18
4.7 Flow mixing loop / minimum limitation of the boiler return temperature ........................................ 19
4.8 Setting the temperature regulators ..................................................................................................... 19
4.9 Safety valves ......................................................................................................................................... 19
4.10 Charging pump (boiler with free-standing calorifier) ........................................................................ 19
4.11 Heating pump ........................................................................................................................................ 19
5. Commissioning
5.1 Water quality.......................................................................................................................................... 20
Heating water.......................................................................................................................................... 20
Filling and replacement water ................................................................................................................. 20
5.2 Filling the heating system .................................................................................................................... 21
5.3 Filling the calorifier (if present) ........................................................................................................... 21
5.4 Commissioning ..................................................................................................................................... 21
5.5 Oil/gas burner........................................................................................................................................ 21
5.6 Handover to the operator / storage ..................................................................................................... 21
6. Maintenance
6.1 Information for fire inspector / chimney sweep regarding emission monitor key.......................... 22
6.2 Cleaning................................................................................................................................................. 23
6.2.1 Preparatory work..................................................................................................................................... 23
6.2.2 Cleaning (dry or wet method).................................................................................................................. 23
6.2.3 Putting into operation again .................................................................................................................... 23
7. Overview of settings
7.1 Table of parameters .............................................................................................................................. 24
7.2 Overview of alarms TopTronic®T.......................................................................................................... 34

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4 205 116 / 02 Important notes
1 Important information
1.1 Other instructions
All instructions relevant to your system can be found
in the Hoval system manual! In exceptional cases,
the instructions can be found enclosed with the
components.
Further information sources
- Hoval catalogue
- Standards, regulations
1.2 Safety information
The system may only be placed in operation if all the
relevant standards and safety regulations have been
complied with. At least the following conditions must
be satisfied for a trial operation:
1. Safety valve installed (closed system).
2. Controlinoperation(connectedto themainscurrent
supply system).
3. Sensor for the safety temperature limiter mounted
in the immersion sleeve.
4. System filled with water.
5. Expansion vessel connected.
6. Flue gas connectors connected to the flue gas
pipeline at the chimney or flue.
7. An adequate supply of fresh air must be guaranteed.
8. The burner is preset.
1.3 Regulations, official approvals
The following regulations are to be complied with for
installation and operation:
Germany
- DIN EN 12831 Heating systems in buildings –
Method for calculation of the design heat load.
- EN303Heating boilerswithforceddraughtburners.
- DIN EN 12828 Sheet 1 and 2
Heating systems in buildings – design of water-
based heating systems.
- DIN 4755 Oil-fired systems.
Design, construction and safety engineering
requirements.
- DIN 4756 Gas-fired systems; construction,
execution,technicalsafety requirements,planning
and execution.
- DIN18160 House chimneys;requirements,planning
and execution.
- TRD 702 Steam boiler plants with calorifiers of
the group II.
- DIN EN 13384 Chimneys – Thermal and fluid
dynamic calculation methods.
- TRD721 Safetydevicesagainst excesspressures/
safety valves / for steam boilers of Group II.
- VDI 2035 Prevention of damage by corrosion and
theformation ofscale in hot waterheating systems.
- DIN 57 116 / VDI 0116 Electrical equipment for
firing systems (VDE Regulation).
- For further standards applicable in Germany, see
appendix N-430 020.
Austria
- ÖNorm 7550
- ÖNorm B 8130 Open water heating systems;
safety devices.
- NormB8131 Closed waterheating systems;safety,
execution and testing requirements.
- ÖNorm B 8133 Hot water production systems;
technical safety requirements.
- ÖNormB 8136 Heatingsystems,spacerequirements
and other building requirements.
- ÖNorm M 7515 Calculations of dimensions of
chimneys; terminology, calculation procedure.
- ÖNorm H 5171 Heating systems, construction
engineering requirements.
- ÖVGW TR-Gas G1 Technical directives for low
pressure gas installations.
- ÖNorm M 7445 Gas blower burner.
Switzerland
- Requirements of theVKF Cantonal Fire Insurance
Association.
- Fire brigade regulations.
- Requirements of the SVGW Swiss Association of
Gas and Water Suppliers.
- SWKI 91-1 Aeration and ventilation of the boiler
installation room.
- SWKI 88-4Water treatment for heating, steam and
air conditioning systems.
- SWKI 93-1 Safety engineering installations for
heating systems.
- KRW Corrosion through halogen compounds.
- KRW/VSO/FKR Plug-in electrical connections on
heating boilers and burners
and further regulations and standards issued by
CEN, CEN ELEC, DIN, VDE, DVGW, TRD and the
legislative body.
Also to be complied with are the regulations of the local
buildingauthorities,insurancecompanies andchimney
sweepingoperations.Theregulations of theresponsible
gas supply company are also to be complied with and
any necessary official approval obtained.

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4 205 116 / 02
Important notes
1.4 Guarantee
Proper function is only guaranteed providing these
instructions are followed and the boiler is regularly
maintained by a licensed specialist. (Maintenance
contract). The rectification of faults and damage
as a result of contaminated operating materials
(gas, water, combustion air), unsuitable chemical
additives and an inadmissibly high lime content of the
heating water, improper handling, faulty installation,
unauthorised modifications anddamageduetothe use
offorcedo notfallunder our guarantee obligations,this
also applies to corrosion due to halogen compounds,
e.g.from spray cans, paints, adhesives, halogenated
fluids, solvents and cleanings agents.

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4 205 116 / 02 Installation
1. Pull up the semicircular rivet (1).
2. Change over the swivel arm (2).
3. Insert the semicircular rivet (1) on the other side.
4. Fit the burner plug and the fire protection switch
(if fitted, Austrian version) on the other side
(see point 2.3, item 9 and point 4.5.1).
The cable must not touch any hot
parts!
Levelling
Using a spirit level, align the upper edge of the
boiler water jacket (longitudinal axis of the boiler)
until it is precisely horizontal or sloping very slightly
upwards towards the rear by inserting the plinth
rails correspondingly, to allow the boiler to vent
properly.
Before fitting the burner, first fit the double
door (Pos. 8b, Figure 7) (door casing).
2. Installation
2.1 Setting up, levelling
A special foundation plate for the boiler is not an
essential, but it is recommended.
Space requirement
for mounting the thermal insulation and sheet metal
cladding:
at least 40 cm each on the left and right side of
the boiler.
If the space between the boiler and the wall is less,
all heat insulation and casing must be fitted before
the boiler can be pushed into its final position.
Do not connect lines until the heat insulation
and casing have been fitted to the boiler!
There must always be enough space between
the back of the boiler and the wall to allow
easy access to the cleaning aperture in the
flue gas collector.
There must be enough space to swing open the
boiler door, incl. the burner.
Do not overtighten boiler door screws.
Fig. 2
1
2
Boiler door pivotable to the left
It is possible to change the attachment of the boiler
door so that it opens towards the left. This can be of
advantage when installing the boiler in a corner.
Proceed as follows:
Close the boiler door and lock it in position
before changing the attachment of the door.

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4 205 116 / 02
Installation
Fig. 3a
See separate assembly instructions for boilers with mounted calorifier 2.2 Fitting the heat insulation 1. Mount the front retaining bracket (1) with hexagon screws M8, nuts and U-washers, aligned horizontally, to the front wall of the boiler. - Attach C-clips. 2. Mount the rear retaining bracket (2) with hexagon screws M8, nuts and U-washers aligned horizontally. - Attach C-clips. 3. Place the insulation mat (3) around the boiler body (with the joint at the top, black side facing outwards, see Figure 3). 4. Attach the insulation mat (3) using 2 plastic straps (4) and strap fasteners (4a): - Tension springs (4b) serve for additional fixing - Do not overtighten the straps (reduced insulating value) 5. Attach the insulation mats (5/5a/5b) to the pins provided on the rear wall of the boiler and secure with retaining discs, Fig. 4a (ø 38). 6. Attach insulation panels (6/6a/6b/6c) to the pins welded onto the flue gas collector and secure with the retaining discs (ø 38) provided. 7. Attach insulation panel (7) to the pins welded onto the front wall of the boiler and secure with the retaining discs (ø 38) provided, Fig. 3a. The remaining 3 insulation mats (8a,10) are fitted after mounting the casing.

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4 205 116 / 02 Installation
Figure 3
7
4a
6a
6c
5
5a
3
4b
C-clips
1
6b
6
2
4
5b
C-clips

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4 205 116 / 02
Installation
2.3 Fitting the casing 8. Fix hexagon bolts with U-washers and hexagon nuts (8). Insert thermal insulation (8a) into the boiler door. Attach the door casing (8b) to the boiler
door using hexagon cap nut.
9. Attach the burner cable (9) to the right or left side wall (9a) (Fig. 4). See also point 4.5.1 Attach right and left side wall (9a) onto the front retaining brackets (1) and rear retaining brackets (2) with self-tapping screws ø 4.8 x 38 and pull
the burner cable upwards.
The cable must not touch any hot parts 10. Place 2 insulating mats (10) left and right in longitudinal direction (to prevent vertical air circulation). 11. Attach rear wall (11/11a) to the angled edges of the side walls (9a) with self-tapping screws ø 3.5 x 6.5. 2.4 Installation of boiler controller 12. Mount the special screw with nut (12, Fig. 5) on the cover plate (12a).Then place switch control box (12b) on the casing cover (12a) with the recess
for the special screw, push back and secure with self-tapping screws ø 3.5 x 6.5 and serrated washers (12c). Position cladding cover (12a, Fig. 7) and fix on the side walls with 2 self-tapping screws ø 4.8 x 12 and C-clips.
13. Pull the capillaries with the immersion sensors (13, Fig. 6) through the opening (13a, Fig. 5) in the cover, insert them into the immersion sleeve
(13b, Fig. 7) as far as the stop and fix in position with retaining spring (13c, Fig. 6).
Attention: The capillaries must not be folded or kinked! 14. Attach cover plate (14) with self-tapping screws ø 3.5 x 6.5 and serrated washers. 15. Position cladding cover (15) and fix left and right with 2 self-tapping screws ø 4.8 x 13. 16. Affix labels and where applicable, mount manual holder on the side.
Figure 4
9
13c Figure 6
12a
13a
12b
12
Figure 5
12c
13a
13

9
4 205 116 / 02 Installation
Figure 7
15
8a
8b
9a
8
9a
13b
14
10
12a
11a
11

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4 205 116 / 02
Technical information
to the turning chamber, from where they flow through
rectangularducts(thermolyticheatingsurface)towards
the rear and reach the flue gas collector.
The flue gas temperatures can be varied within
a specific range through the installation of various
regulator combinations.
3 Technical information
3.1 Description of the boiler
The Uno-3 is a threepass boiler. At the end of the
circular cylindrical combustion chamber, the flame
gases flow through several cylindrical tubes arranged
above the combustion chamber and towards the front
Figure 8
3.1.1 The Uno-3 (95-125) complies with the following directives + standards
We hereby declare that the product described, as an individual appliance, complies with the standards,
guidelines and technical specifications laid down.
Directives: 90/396/EC "Gas Equipment Directive"
92/42/EC "Efficiency directive"
73/23/EEC "Low-voltage directive"
89/336/EEC "Electromagnetic compatibility"
97/23/EC "Pressure Equipment Directive" (PED)
Regulations: Stability prEN14394:2001
Building requirements EN303-1, EN303-2, EN303-3
Low voltage DIN VDE 0722 / Ed. 04.83
EMC EN 50082 Part 1 / Ed. 01.92

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4 205 116 / 02 Technical information
Fuel Heating oil EL Natural gas H
Option 1 Option 2 Option 3 Option 1 Option 2 Option 3
min. flue gas temperature °C 130 110 130 130 110 130
min. boiler temperature °C 48 50 52 58 60 62
min. return temperature °C 35 38 No lower limit 45 48 No lower limit
Return temperature controls yes yes no yes yes no
Boiler start-up protection 1no no yes no no yes
1Boiler minimum temperature limit effective on group actuators
Type (95) (110)
• Nominal heat output at 80/60 °C 1kW 95 110
• Thermal output kW 60-95 70-110
• Maximum heat input kW 102.1 118.3
• Maximum boiler operating temperature 2°C 90 90
• Safety temperature limiter setting (water side) 2°C 110 110
• Operating/test pressure at max. operating temperature 90 °C 2bar 4.0/5.2 4.0/5.2
• Maximum boiler operating temperature 3°C 105 105
• Safety temperature limiter setting (water side) 3°C 120 120
• Operating pressure at max. operating temperature 105 °C 3bar 3.0 3.0
• Minimum boiler operating temperature °C see table of operating conditions (below)
• Minimum boiler return temperature °C see table of operating conditions (below)
• Minimum flue gas temperature at boiler °C see table of operating conditions (below)
•Regulator set for 160 °C 3R5+ 3R5+
Flue gas temperature 1R2/290 2R3/290
• Boiler efficiency at full load and 80/60 °C
(related to net/ gross calorific value, heating oil EL) % 92.6 / 87.4 92.7 / 89.5
• Boiler efficiency at partial load 30% and return 37 °C
(acc. to EN 303) (related to lower/upper calorific value heating oil EL) % 94.8 / 89.4 94.8 / 89.5
• Standard efficiency at 75/60 °C (DIN 4702 Part 8)
(related to net/gross calorific value, (heating oil EL)) % 95.7 / 90.3 95.9 / 90.47
• Standby losses qB at 70 °C Watts 400 400
• Resistance on the heating gas side at nominal output
160 °C flue gas temperature, 12.5 % CO2 , 500 m above sea level
(tolerance ±20 %)
mbar 0.65 0.89
• Flue gas mass flow at nominal output 12.5 % CO2heating oil kg/h 162 188
• Flow resistance boiler 4z-value 0.2 0.2
• Hydraulic resistance at 10K mbar 13.35 17.90
• Hydraulic resistance at 20K mbar 3.34 4.47
• Water flow rate at 10K m³/h 8.17 9.46
• Water flow rate at 20K m³/h 4.09 4.73
• Boiler water content litres 250 250
• Boiler gas content m³ 0.1848 0.1848
• Insulation thickness of boiler body mm 80 80
• Weight (incl. casing) kg 391 391
•Sound level 5
- Heating noise without absorber hood (EN 15036 Part 1) dB(A) 77 79
- Heating noise with absorber hood (EN 15036 Part 1) dB(A) 67 67
- Flue gas noise inside the flue (EN 15036 Part 2) dB(A) 87 91
- Flue gas noise radiated from the mouth (DIN 45635 Part 47) dB(A) 79 84
• Combustion chamber dimensions Ø-inside x length mm ø440x974 ø440x974
• Combustion chamber volume m³ 0.148 0.148
•Dimensions see Dimensions
• Maximum depression in flue gas system (boiler connection) Pa 30 30
1At nominal output, the pollutant limit values and flue gas losses as per regulation LRV 92 (CH) are complied with.
2Controller U3.1 and T2.2
3Controller U3.2 and T0.2
4Flow resistance boiler in mbar = flow rate (m3/h)2x z
5Data valid for Hoval oil compact heat station b-i
3.2 Technical data Uno-3 (95-110) for Switzerland
Possible operating conditions

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4 205 116 / 02
Technical information
Type (110) (125)
• Nominal heat output at 80/60 °C kW 110 125
• Heat output range (heating oil EL, natural gas H: variant 1 and 3) kW 70-110 70-125
• Heat output range (heating oil EL, natural gas H: variant 2) kW 50-110 50-125
• Maximum heat input kW 118.3 135.8
• Maximum boiler operating temperature 1°C 90 90
• Safety temperature limiter setting (water side) 1°C 110 110
• Operating/test pressure at max. operating temperature 90 °C 1bar 4.0/ 5.2 4.0/ 5.2
• Maximum boiler operating temperature 2°C 105 105
• Safety temperature limiter setting (water side) 2°C 120 120
• Operating pressure at max. operating temperature 105 °C 2bar 3.0 3.0
• Minimum boiler operating temperature °C see table of operating conditions (below)
• Minimum boiler return temperature °C see table of operating conditions (below)
• Minimum flue gas temperature at boiler °C see table of operating conditions (below)
• Regulator set for 170 °C flue gas temperature 3R5+2R3 3R5+2R3
• Boiler efficiency at full load and 80/60 °C
(related to lower/upper calorific value (heating oil EL)) % 92.7/ 87.6 92.8/ 87.6
• Boiler efficiency at partial load 30 % and return 37 °C
(acc. to EN 303) (related to lower/upper calorific value (heating oil EL)) 94.8 /87.6 92.8 /87.6
• Standard efficiency at 75/60 °C (DIN 4702 Part 8)
(related to lower/upper calorific value (heating oil EL)) % 95.9/ 90.5 95.8/ 90.4
• Standby losses qB at 70 °C Watts 400 400
• Resistance on the heating gas side at nominal output
180 °C flue gas temperature, 12.5 % CO2 , 500 m above sea level
(tolerance ±20 %)
mbar 0.89 1.10
• Flue gas mass flow at nominal output 12.5 % CO2 heating oil kg/h 188 222
• Maximum flue draught Pa 20 20
• Flow resistance boiler 3z-value 0.2 0.2
• Hydraulic resistance at 10K mbar 17.90 24.80
• Hydraulic resistance at 20K mbar 4.47 5.80
• Water flow rate at 10K m³/h 9.46 11.10
• Water flow rate at 20K m³/h 4.73 5.40
• Boiler water content litres 250 250
• Boiler gas content m³ 0.1848 0.1848
• Insulation thickness of boiler body mm 80 80
• Weight (incl. casing) kg 391 391
• Sound level 4
- Heating noise without absorber hood (EN 15036 Part 1) dB(A) 79 80
- Heating noise with absorber hood (EN 15036 Part 1) dB(A) 67 67
- Flue gas noise inside the flue (EN 15036 Part 2) dB(A) 91 91
- Flue gas noise radiated from the mouth (DIN 45635 Part 47) dB(A) 84 84
• Combustion chamber dimensions Ø-inside x length mm ø440x974 ø440x974
• Combustion chamber volume m³ 0.148 0.148
• Dimensions see Dimensions
• Maximum depression in flue gas system (boiler connection) Pa 30 30
1Controller U3.1 and T2.2
2
Controller U3.2 and T0.2, operating pressure may be increased to 4 or 5 bar in countries in which the Pressure Equipment Directive is not in force.
3Flow resistance boiler in mbar = flow rate (m³/h)2x z
4Information applies to combinations with Hoval-tested oil burner
3.3 Technical data Uno-3 (110,125) for all other countries
Fuel Heating oil EL Natural gas H
Option 1 Option 2 Option 3 Option 1 Option 2 Option 3
min. flue gas temperature °C 130 110 130 130 110 130
min. boiler temperature °C 48 50 52 58 60 62
min. return temperature °C 35 38 No lower limit 45 48 No lower limit
Return temperature controls yes yes no yes yes no
Boiler start-up protection 1no no yes no no yes
1 If the boiler temperature is or drops below the minimum boiler temperature (variant 3) and there is no return maintenance then the load must
be switched off using a corresponding control function.
Possible operating conditions

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4 205 116 / 02 Technical information
3.4 Dimensions
3.5 Dimensions without heat insulation and casing (transport dimensions)
Boiler (without calorifier) incl. swivel flange, connections and flue gas collector
11
7
9
10
12
1 Flow type 130-160 DN 50, PN 6
2 Return type DN 50, PN 6
3 Safety flow R 1 ¼"
4 Flow for calorifier R 1 ¼"
5 Return for calorifier R 1 ¼"
6 Drain pipe R 1"
7 Flue gas outlet
8 Cleaning aperture
9 Boiler controller
10 Boiler door attached on the right (on the left if desired)
11 Burner absorber hood
12 Connection for burner cable
(burner plug)
13 E-cable infeed
2
13
13
5
4
8
6
(Third-party burner)

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4 205 116 / 02
Technical information
Existing flue gas systems may require upgrading
or adjustment of the flue duct cross-section as
indicated by a chimney engineer.
Thecorrectfunctioningof the flueduct,i.e.the generation
of the required delivery pressure depends on:
a) the type (nature) of the chimney (thermal insulation,
interior surface roughness, sealing etc.)
b) the connection of the boiler to the chimney
according to specification
c) establishing the correct flue duct cross-section
dimension.
ref. a)
Chimneys according to EN 13384, part 2, execution
typesI and II are appropriate formodernfiringsystems
(advice from the chimney specialist is necessary).
to b)
The flue gas pipe connecting the boiler to the flue gas
system must be as short as possible and placed at
an angle of 30-45°.
The entry location of the flue gas pipe must be
carefully sealed.
Theintroductionoftheflue gas pipe intothechimney(a)
must be executed so that no condensate water can
flow from the chimney into the flue gas pipe and the
boiler. (Fig. 10)
Wherepossible,avoid 90° bends inthefluegassystem!
Flue gas pipes longer than 1 m are to be insulated.
4. Installation
4.1 Boiler room requirements
Regarding the building specifications for boiler rooms
and their supply and extract air handling, the current
building supervisory office regulations specific to the
state or country are to be observed. In Germany the
firing regulations for the individual Bundesländer are
to be complied with.
Make sure there is an adequate supply of fresh
air to the boiler room,
to ensure that the combustion air supply necessary
for all the firing systems operated there can flow in
without hindrance and that no oxygen deficiency
occurs for the operating personnel.
Binding values for the size of supply air openings are
not generally specified in the relevant regulations;it is
merelyrequiredthatno partialvacuuminexcessof 3N/
m2occurs.An opening or line leading into the open air
of at least 150 cm2. For every kW in excess of 50 kW,
a further 2 cm2must be calculated. In rectangular
openings, the ratio of the sides should not exceed
1.5:1;if a grid is fitted, an appropriate allowance must
be added so that the free cross-section area reaches
the amount given above.
In Austria ÖNorm H 5171 additionally stipulates a
flue air aperture. This must have a minimum cross
section of 180 cm2up to a rated heat output of
100 kW. For every further kW, the cross-section must
be increased by 1 cm2.
Thefluegas system mustbewatertight,acid-
proof and approved for the corresponding
flue gas temperatures.
As a general rule, only one heat generator should
be connected to the chimney! When using two
heat generators,the corresponding regulations
must be observed.
4.2 Connection of the flue gas system
and flue duct dimensions
Toguaranteeeconomicand fault-freeoperation,boiler
and chimney must be mutually adapted to create
a functional unit.
Moisture-resistant and acid-proof flue gas
systems must be used in new installations.
a
Figure 10

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4 205 116 / 02 Technical information
Normally only one heat producer may
be connected to the chimney!
Flue gas pipes longer than 1 m are to be insulated.
If an adapter (reducer) from the flue gas outlet of the
boiler to the entry point into the flue gas system is
required, it must take the form of a slim cone.
vom
Kessel zum
Schornstein
to c)
Dimensioning the chimney cross section. The cross
sectionsare tobe calculated forboilers without delivery
pressure requirement according to EN 13384. (Please
also observe DIN 18160, Part 1 "Domestic chimneys").
Takeinto consideration location-specific factors(hillside
location of the building, chimney position, slope of the
roof, chimney stack exit shape, etc.)!
In Switzerland, take note of SIA Recommendation
384/4!
In Austria, calculation is performed as prescribed by
ÖNorm M 7515.
Non-binding guide values for dimensioning of the
flue duct for boiler types Uno-3 (95-125).
Inside diameter of flue duct in mm
Boiler type
Uno-3 kW *
Chimney height
11-15 m
95 95 ~ 180
110 110 ~ 180
125 125 ~ 180
*kW = maximum boiler output
Basic data:
Flue gas pipeline 5 m long, 2 90° elbows and
1 45° elbow, outside air 15°C, height above sea level
max. 800 m, flue gas pipeline same ø as flue gas
connector on boiler.
You are recommended however to use the
services of the chimney specialist right from the
planning stage!
from the
boiler
to the
chimney

16
4 205 116 / 02
Technical information
4.3 Fitting the burner
- Depending on the size of the burner flange,
an intermediate flange may be required to attach
the burner.
- To allow the burner to be swung out 90° to the
left or right, the connections must be flexible and
routed to the burner in sufficiently large loops.
- The cavity between burner pipe and boiler flange
must be insulated with the fireproof fibre provided.
4.3.1 Sound insulation
- Gas pipes must be mounted in such a way that no
vibrations are transferred to the building.
- Theburnercanbeequippedwithasound-absorbing
hood.
- Werecommendthatyouinstall silencersdownstream
of the boiler in the flue gas pipe.
Do not overtighten boiler door screws.
Figure 11
A
E
J
G
H
innen
L
M
Figure 12
Uno-3 A B C D E F G H J L M
Ø Ø Ø
90-125 140 170 400 165 119 248 440 974 307 30 25
Fill the gap with insulating material
inside

17
4 205 116 / 02 Technical information
4.4 Fuel
The boiler is only to be operated with
the fuel stated on the boiler rating plate.
Uno-3 boilers are suitable for the combustion of the
following fuels:
- Heating oil EL in accordance with DIN 51 603 /
SN 181 160 /2 / ÖNorm C 1109
- Heating oil L in accordance with ÖNorm C 1108
- All fuel gases as defined by DVGW process
sheet G 260
4.5 Electrical connection
Aqualified technician must install the electrical supply
to the equipment. The electrical circuit diagram is
located in the electrical box.
Applicable only to Austria and Germany:
An electrical circuit diagram is supplied with the boiler
controls.
Please affix the correct connection diagram to the
inside of the terminal cover.
Important!
A main switch must be installed on-site in the supply
line which performs an all-poles cut-out and has a
clearanceof at least 3 mm betweentheopen contacts.
Applicable only to Switzerland:
The system-related electrical circuit diagram must be
referred to when making the electrical connection!
4.5.1 Electrical connection of the burner
- The burner must be connected to the boiler with
the standard plug-in connection.
- The burner cable must be shortened so that the
plug-in connection has to be parted to swing out
the burner.
4.6 Flue gas regulator set
The flue gas regulators fitted in each case are listed
on a label on the boiler casing (side section Figure 7,
Pos. 9a).
The installer can change the flue gas regulator set
fitted and thus vary the flue gas temperature within
a specific range.
Even in partial load operation, the flue
gas temperature must not fall below
100 °C.
Inspection
hole
Regulators
Figure 13

18
4 205 116 / 02
Technical information
4.6.1 Flue gas and performance diagrams
Uno-3 (95)
kW
°C
kW
°C
3R5+1R2/290
3R5+2R3/290
3R5+2R3/290
Uno-3 (110)
The curves shown here represent an average value based on measurements taken with burners from various
manufacturers. Deviations of ±10 % are normal.
kW = Heat capacity
°C = flue gas temperature with heating oil EL,
Boiler flow 80 °C
Return flow 60 °C.
CO2 = 13 %
During the combustion of natural gas or heating oil L, the flue gas temperature is approx. 15 °C higher.
Uno-3 (125)
°C
kW
100
110
120
130
140
150
160
170
180
190
60 65 70 75 80 85 90 95
100
110
120
130
140
150
160
170
180
190
70 75 80 85 90 95 100 105 110
100
110
120
130
140
150
160
170
180
190
70 80 90 100 110 120 130

19
4 205 116 / 02 Technical information
Flue gas temperature under other operating
conditions
Influence of the boiler water temperature on the
flue gas temperature
A change in the boiler water temperature of ±10 K
results in a change of approximately ±6 K in the
flue gas temperature.
Influence of the CO2content in the flue gases
A change in the CO2content of ±1 % changes the
flue gas temperature by approx. ±8 °C.
Key to regulator designation
No. of regulators
Regulator width (example: 5 units)
3R5/290
Length of the regulators
4.7 Flow mixing loop / minimum limitation
of the boiler return temperature
Hydraulic and control measures must be provided
to ensure that the temperatures do not fall below
the permissible minimum boiler flow and return
temperature under any operating conditions.
4.8 Setting the temperature regulators
- without heating regulator:
Set the boiler temperature in accordance with the
outside temperature.
- with heating regulator:
The heating regulator automatically sets the
correct boiler temperature.The boiler temperature
varies between the minimum and maximum boiler
temperatures entered.
If a calorifier is connected, the priority circuit
disables the boiler temperature regulator
until the temperature is reached. The boiler
temperature can rise to approx. 85 °C.
4.9 Safety valves
Theheatingsystem and hotwatersupplymusteach be
protected with one safety valve against impermissibly
high pressures.The discharge capacity of the heating
system safety valve must correspond to the boiler’s
maximum nominal heat output.The valve is installed
in the safety flow. In Germany, only safety valves
with the code letter "H" in the approval mark may
be connected, and they must always be connected
at the boiler safety flow. Water shortage protection
in accordance with EN 12828 Part 2 Section 9 is
mandatory.
4.10 Charging pump (boiler with free-
standing calorifier)
Speed of rotation and output regulation must
correspond to the requirements of the free-standing
calorifier.Setting carriedout bythe heating installation
engineer.
4.11 Heating pump
Speedofrotation and outputregulationmustcorrespond
to the requirements of the system. They are to be set
by the heating installation engineer.

20
4 205 116 / 02
Commissioning
Heating Water
The European Standard EN 14868 and the
directive VDI 2035 must be observed.
In particular, attention must be paid to the following stipu-
lations:
• Hoval boilers and calorifi ers are designed for heating
plants without signifi cant oxygen intake (plant type I ac-
cording to EN 14868).
• Plants with
- continuous oxygen intake (e.g. underfloor heating
systems without diffusion proof plastic piping) or
- intermittent oxygen intake (e.g. where frequent refill-
ing is necessary)
must be equipped with separate circuits.
• Treated fi lling and replacement water must be tested at
least 1x yearly. According to the inhibitor manufacturer‘s
instructions, more frequent testing may be necessary.
• A refi lling is not necessary if the quality of the heating
water in existing installations (e.g. exchange of boiler)
conforms to VDI 2035.
The Directive VDI 2035 applies equally to the replace-
ment water.
• New and if applicable existing installations need to be
adequately cleaned and fl ushed befor being fi lled. The
boiler may only be fi lled after the heating system has
been fl ushed!
• Parts of the boiler which have contact with water are
made of ferrous materials.
• On account of the danger of stress cracking corrosion
the chloride, nitrate and sulfate contents of the heating
water must not exceed 200 mg/l in total.
• The pH value of the heating water should lie between
8.3 and 9.5 after 6-12 weeks of heating operation.
Filling and replacement water
• For a plant using Hoval boilers untreated drinking water
is generally best suited as heating medium, i.e. as fi ll-
ing and replacement water. However, as not all drinking
water is suitable for use as as fi lling and replacement
water the water quality must fulfi l the standard set in
VDI 2035. Should the mains water available not be suit-
ed for use then it must be desalinated and/or be treated
with inhibitors. The stipulations of EN 14868 must be
observed.
• In order to maintain a high level of boiler effi ciency and
to avoid overheating of the heating surfaces the values
given in the table should not be exceeded (dependent
on boiler performance ratings - for multi-boiler plants
rating of smallest boiler applies - and on the water con-
tent of the plant).
• The total amount of fi lling and replacement water which
is used throughout the total service life of the boiler
must not exceed three times the water capacity of the
plant.
Maximum filling capacity based on VDI 2035
Total hardness of the fi lling water up to ...
[mol/m3] 1<0,1 0,5 1 1,5 2 2,5 3 >3,0
f°H <1 5 10 15 20 25 30 >30
d°H <0,56 2,8 5,6 8,4 11,2 14,0 16,8 >16,8
e°H <0,71 3,6 7,1 10,7 14,2 17,8 21,3 >21,3
~mg/l <10 50,0 100,0 150,0 200,0 250,0 300,0 >300
Conductance 2<20 100,0 200,0 300,0 400,0 500,0 600,0 >600
Boiler size of the
individual boiler maximum fi lling quantity without desalination
to 50 kW NO REQUIREMENT 20 l/kW
50 to 200 kW 50 l/kW 20 l/kW 20 l/kW always desalinate
1 Sum of alkaline earths
2 If the conductance in µS/cm exceeds the tabular value an analysis of the water is necessary.
5. Commissioning
5.1 Water quality