OSCAR C-S Series Guide

TECHNICAL MANUAL AND USER’S INSTRUCTIONS
CONDENSING OIL COMPACT UNIT
SERIES C-S
MODEL C-S 28
NOMINAL POWER 28 Kw

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Dear customer,
Thank you very much for your preference for selecting the OSCAR “CONDENSING OIL
COMPACT UNIT, SERIES C-S” from other products available on the market, as well as, for
your confidence in the OSCAR industry.
Please read this manual carefully before installing and using the unit and follow the
recommendations and instructions that apply to it.
OSCAR
INDUSTRIES
ADDRESS :
VASILIOS G. POLITIS
32 Km STAVROU –LAVRIOU
19003 MARKOPOULO
GREECE
www.oscarboilers.gr

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● This technical manual is part of the individual unit that you purchased. It is addressed to
the technicians who will install the unit as well as to the end user who will use it. Please read
the instructions carefully before you start on the unit. You must keep this manual in a
secure place for future use.
• If the owner of the unit will be changed or the user of the unit, make sure that you have
been informed of this technical manual.
This signal indicates procedures which, if executed incorrectly, can cause
injury or property damage.
• Installation should only be carried out by qualified technicians.
• Installation of the unit must be carried out in accordance with this manual and the
manufacturer's instructions.
• Observe the manufacturer's instructions for the oil burner
• Incorrect or improper installation may result in personal injury or property damage. The
Company declares that it has no liability in the event of damage caused by incorrect or
incorrect installation or failure to follow the installation instructions.
• At least one annual inspection and service by a qualified technician is required to maintain
the installation in accordance with the specifications and the initial setting.
• In case of leakage of the unit, call an authorized technician. Any parts replacement of the
unit must be done using original spare parts.
• Before any cleaning or maintenance work on the unit, the electrical supply of all appliances
connected to the boiler (burner, pump, etc.) must be interrupted by closing the unit ON / OFF
switches .
(καυστήρας, κυκλοφορητής κ.λπ.), κλείνοντας τους διακόπτες ON/OFF της μονάδας και
κατεβάζοντας την ηλεκτρική ασφάλεια της γραμμής τροφοδοσίας ρεύματος του γενικού
ηλεκτρικού πίνακα .
• Due to the continuous improvement of the product, the data presented in this manual may
differ slightly from the actual product.
NOTES

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α/α
ΠΕΡΙΓΡΑΦΗ
ΣΕΛΙΔΑ
1
OIL CONDENSING COMPACT UNIT C-S
6
2
Technical characteristics of C-S 28
8
2.1
Energy label
9
2.2
Package contents
10
3
Installation instructions
11
3.1
General notices
11
3.2
Chimney
12
3.3
Hydravlic installation
13
3.4
Oil tank installation
15
3.5
Electric circuit
15
3.6
Electrical connections
16
3.7
Electrical diagram
17
3.8
Cable connection
18
3.9
Safety measures
18
4
First starting
19
5
General Recommendations
20
6
Safety
20
7
Emergency cases
21
8
Maintenance - cleaning
23
9
OSCAR guarantee
27
10
Maintenance book
28
ΠΕΡΙΕΧΟΜΕΝΑ

OSCAR –Series C-S
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1. OIL CONDENSING COMPACT UNIT C-S
The C-S oil co unit uses a reversible exhaust flow steel boiler to optimally exploit its thermal
energy, keeping the NOx (oxides of nitrogen) very low. This is achieved by the excellent
combination of OSCAR's oil-burning expertise and the most important construction
companies abroad, such as Italian RIELLO with the most modern RDB series burners,
GRUNDFOS Denmark with the latest ErP circulators and others.
The oil boilers reversed exhaust flow, with excellent design and construction geometry based
on good reception of all available heat from the boiler exhaust gas. This is done through the
design of the boiler which generates three exhaust routes. The exhaust gas after the initial
output from the boiler is raised to the top of the apparatus to enter the specially designed
stainless heat exchanger for further heat utilization of energy contained.
As a result of all the above, the efficiency of the compact unit C-S is higher than 103% (see
relevant tables and explanations).
The C-S condensing unit is intended exclusively for inside heating and hot water production
using heating oil (light oil).
The following directives and standards are met during the construction of the unit:
DIRECTIVES
1. Directive 92/42 / EEC Performance requirements for new hot-water boilers fired with liquid
or gaseous fuels.
2. Directive 2014/30 / EU Directive on electromagnetic compatibility.
3. Directive 2014/35 / EU Directive on electrical equipment intended for use within certain
voltage limits.
4. Directive 2009/125 / EC Eco design requirements.
5. Regulation 813/2013 Eco design Regulations.
6. EN 303-1 Heating boilers - Part 1: Heating boilers with forced draft burners - Terminology,
general requirements, testing and marking.
7. EN 303-2 Heating boilers - Part 2: Heating boilers with forced draft burners - Special
requirements for boilers with oil-fired burners.
8. EN 303-4 Heating boilers - Part 4: Heating boilers with forced draft burners - Special
requirements for forced draft boilers with a payload of up to 70 kW and a maximum operating
pressure of 3 bar - Terminology, special requirements, testing and marking .
9. EN 304: 1992 Test code for heating boilers for oil burners with mechanical spraying of fuel.

OSCAR –Series C -S
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10. ΕΝ 15034: 2007 Condensing oil boilers
11. EN 267 Monoblock type pressurized boilers - Tests.
12. EN 60335-1, Safety of household and similar electrical appliances.
13. EN 60335-2-102 Safety of household and similar electrical appliances. Special
requirements for gas, oil or solid fuel combustion appliances which have electrical
connections.
14. EN 55014-1, EN 55014-2 Electromagnetic compatibility - Requirements for household
appliances, power tools and similar devices.
EC DECLARATION OF CONFORMITY, CE
This product conforms to its construction and operation with the relevant EU directives.
The product features and assembly conditions are described in this manual.
The EC declaration of conformity is available by e-mail to the OSCAR industry at:
[email protected]r
THE USE OF THIS APPLIANCE OF CHILDREN AGED TO 18 YEARS
EXPRESSLY IS PROHIBITED.

OSCAR –Series C-S
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2. TECHNICAL CHARACTERISTICS C-S 28
C-S 28
kw 28,20
kw 27,64
OIL
%≥ 98
% ≥ 99
% ≥ 102
%≥ 103
Seasonal efficiency factor, nson
in active mode, %
% ≥ 93
Α
5
mbar 0,11
L45
bar 3
inches 1''
mm 60/100
mm 890-460-1050
kg 132
C-eco 28
mm 16X2
18/27
m2 0,68
inches 1''
mm 20
H
mm 371-128-220
Kg 23
RDB 1 BF
Pump, ErP, GRUNDFOS UPM 3 AUTO
Condensate outlet
≥ 95
Heat exchanger's heating surface
Hydravlic connection of Heat exchanger
Back pressure combustion chamber
Water volume of boiler
Maximum working pressure
Hydraulic connection
Excaust gas diameter
Dimmensions (L-W-H)
Total Weight
Heat exchanger model
Tube's diameter
Tube's number (1st / 2nd path)
Oil burner RIELLO
%
Heat exchanger's Weight
Heat exchanger' Postion (H/V)
Heat exchanger's Dimmensions
TECHNICAL CHARACTERISTICS AND EFFICIENCY OF
CONDENSING OIL COMPACT UNIT, SERIES C-S
Fuel
Energy class
Nox class
Seasonal efficiency factor, ns
Full load effciency, 100%, (80-60ο C)
Model
Nominal oil power
Usefull power (ns)
Partial load efficiency 30% (50-30ο C)
Partial load efficiency , 30% (80-60ο C)
Full load effciency 100%, (50-30ο C)

OSCAR –Series C -S
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2.1 Energy label
In the C-S series, a series of steel compact oil condensation units
Regulation (EU) 811/2013 applies and marked with the ENERGY LABEL sticker indicating to the
final consumer:
● The manufacturer
● Use (eg heating)
● The model
● The energy efficiency class of each particular model (A +, A, B, etc.)
● Power
● The year of construction
Visit our website www.oscarboilers.gr for more information on ErP systems and regulations.
ENERGY CLASS OF C-S SERIES
The C-S 28 is marked as A class unit in heating.
Seasonal efficiency : ns ≥ 93%

OSCAR –Series C-S
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2.2 Package contents
The C-S compact unit package include:
1. Compact unit on its metallic covers.
2. Plastic zipper folder containing:
- warranty
- Energy label (sticker)
- Installation’s and use instructions
- A relief valve, ½’’ for the hydraulic circuit
* The unit consists of the following basic (but not only) components:
- Steel boiler
- Instrument panel wired
- RIELLO oil burner connected electrically and mechanically
- ErP GRUNDFOS pump
- 8-liter expansion tank
- A relief valve, ½’’ for the hydraulic circuit (2nd)
- Mechanical filter
- Safety valve ½ ''
- Stainless steel heat exchanger
- Concentrate siphon
- Drainage pipe (black PP)
- "T" Exhaust Gas Plastic, 60/100
- Flexible spark blower 76 mm
- Four restraints (mounted on the base of the unit)
note
The plastic chimney 60/100 that comes with the unit is delivered in a separate package,
outside of the unit.
The oil burner uses external air to burn the fuel. Carefully check the airtightness of
the unit's flexible ducts.
BE SURE FOR THE CORRECT VENTILATION OF THE COMBUSTION SPACE.

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3. INSTALLATION INSTRUCTIONS To
install the unit, contact a licensed hydraulic installer for the hydraulic connection
and a licensed liquid fuel technician to start the unit. All country’s regulations,
including those referring to national and European standards, must be met when the
appliance is installed and is a clear condition for the warranty.
4. During transport, it is forbidden to overturn or move the boiler in a horizontal or
lateral position.
5. During installation, the necessary protective equipment (Personal Protective
Equipment) must be used by all involved.
3.1 GENERAL NOTICES
1. During installation, the unit's distance from flammable materials and the oil tank must be
greater than 1.5 meters unless a fire partition is fitted between the unit and flammable
materials by a licensed Engineer.
2. The floor on which the unit is to be installed should be horizontal and able to withstand its
weight.
3. It is forbidden to place the unit near flammable materials.
4. The unit must be installed at a suitable height to protect it from spillage in the combustion
area (boiler room).
5. DO NOT place the device in direct contact with the walls. The distances between the side
and rear parts of the unit and the walls must be sufficient to allow space for the installation
of hydraulic systems and for cleaning and maintenance. The minimum distance must be 40
cm.
6. Although the unit does not draw in air from the inside, it is necessary to install a combustion
air inlet at a wall of the installation space of at least 20x20 cm (a study to determine the exact
size required by the licensed installer is required) with blinds which it can not be clogged. It is
forbidden to fit a closure at the inlet of the duct.
CAUTION RISK OF ASPHYXIA !
DO NOT let your children play with the packaging materials

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3.2 CHIMNEY
1. Contact a qualified and licensed installer for the central chimney (Licensed Hydraulic).
2. The installation of the chimney must be carried out in accordance with the requirements of
European standards EN 1856-1-2, EN 1443, EN 13384-1, EN 13384-3 and EN 15287-1.
3. Parts of the central flue (if used) must be suitable for the specific use (condensing
technology) and be CE marked.
4. Ensure the removal of flammable materials located in the installation area (consult with the
licensed hydraulic installer).
5. The height of the central chimney is required to be at least 1 m from the outlet of the unit.
6. It is forbidden to use horizontal sections and flexible metallic ducts.
7. The chimney should be adequately supported all the way along stable building blocks such
as floors and walls.
8. The required drag depends on the installation. Indicatively, pull requirements of at least 20
mbar are reported, while the final height is required to be dimensioned by your licensed
installer or engineer.
9. The boiler is not allowed to be connected to a chimney serving other heating appliances.
10. Due to the fact that the unit is operating at flue gas temperatures below 100 ° C, it is
necessary to install a plastic chimney in accordance with European Standard EN14471. Simple
metal chimneys are impractical.
11. If used in conjunction with other combustion appliances, it is necessary to ensure a higher
supply of external combustion air according to the requirements of the appliances. This can
be done by creating more openings to the outside environment. Follow the installation
instructions for each device separately and create as many apertures as needed. (Before any
such event, you must contact a licensed installer or your Engineer, who will take into account
the ventilation requirements of all devices).
12. Install the chimney to a point where there are no obstructions and where no air
turbulence is generated.
13. Particular attention is needed on how to seal the chimney crossing point from the roof of
the building. Waters dripping over it can spoil it.
14. If a built-in chimney is to be used, it is required to place inside it a plastic chimney with the
same specifications as presented earlier in this paragraph. In any case ask your engineer.
15. 15. It is forbidden to pass through the chimney any piping (any kind) of the installation.
16. It is necessary to install a windproof and anti-rain hat.
17. Test and check the safety systems immediately after installation.
18. It is necessary to carry out a flue gas control after the boiler has been installed. Always ask
FUEL CONTROL CHECK from the licensed liquid fuel technician.
17. Test and check the safety systems immediately after installation.

OSCAR –Series C -S
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18. It is necessary to measurement of exhaust gases after the boiler has been installed. Always
ask measurement of exhaust gases from the licensed liquid fuel technician.
3.3 HYDRAULIC INSTALLATION
1. Hydraulic installation is required to be carried out ONLY by a licensed hydraulic installer.
2. The unit includes the following components:
- Steel boiler
- Instrument panel wired
- RIELLO oil burner connected electrically and mechanically
- ErP GRUNDFOS pump
- 8-liter expansion tank
- A relief valve, ½’’ for the hydraulic circuit (2nd)
- Mechanical filter
- Safety valve ½ ''
- Stainless steel heat exchanger
- Concentrate siphon
- Drainage pipe (black PP)
- "T" Exhaust Gas Plastic, 60/100
- Flexible spark blower 76 mm
- Four restraints (mounted on the base of the unit)
3. Always connect BEFORE to the water supply:
- Pressure reducer
- Automatic filling mechanism
- Non-return valve
and adjust the grid pressure in relation to the plant's manometer height
and the technical instructions and recommendations of this manual.
4. The unit vents to an outside position higher than its own.
Install the second relief valve, or immediately after RETURNING WATER TO THE ALTERNATE
(which is the best position) or at the higher point of your plumbing.
5. The very good insulation of all hydraulic pipes that do not pass through heated rooms is
MANDATORY and is also required for economy reasons.

OSCAR –Series C-S
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REAR SIDE, GLOVE SURFACE
CLARIFICATIONS - LABELING
BACK WATER
HOT HEATING WATER
TO THE CHIMNEY
ON/OFF
TO THE NEUTRALIZER /
DRAIN
THERMOSTAT
BOILER’S WATER
EMPTYING
NEUTRALIZER’S
POSITION
(is not included
In the package)
Pic 1: Hydravlic spare parts connections
1. It is forbidden to install valves and other interlocks between the safety and measurement
systems and the unit.
2. After installation, an operating test for leakage is required.

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3.4 INSTALLATION OF OIL TANK
1. The connection to the oil pipe in the burner is required to be carried out ONLY by a licensed
liquid fuel technician.
2. It is necessary to connect all necessary safety and operational devices for the correct
installation of the fuel flow:
- Electromagnetic valve,
- oil filter,
- flow isolation switch).
3. The tank is required to be mounted on a flat base and carry a flow switch at its outlet.
The oil pipe from the tank to the burner is forbidden to exceed the height of
the burner.
3.5 ELECTRIC CIRCUIT
1. The electrical connection must be carried out by a licensed installer.
2. The supply voltage is 220-230 V, 50 Hz.
The instrument panel of the C-S series boiler:
It has the following instruments:
- Water thermometer
- ON / OFF burner switch
- Safety thermostat
- Circulator thermostat
- Burner thermostat
The panel can be supplied with OSCAR room’s space thermostat (not included)

OSCAR –Series C-S
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To start boiler operation, turn the unit's main switch to the rear.
Then and after we have defined:
- The burner thermostat at 80 ° C, and
- The pump thermostat of 30-40 ° C
We turn on the instrument panel ON/OFF switch and the unit starts its operation.
The water thermometer shows the water temperature in the boiler. It shall under no
circumstances exceed 95 ° C.
The safety fuse is guaranteed by the safety thermostat with a limit of 100 ° C
3.6 ELECTRICAL CONNECTION OF THE PANEL INSTRUMENT
The unit is electrically ready to operate. All electrical connections have been made to it.
Although the unit is connected, a first visual inspection is required (by license technician) for
the stability of the connections.
For the supply of power to the unit, the applicable National Electrical Regulations must be
applied.
The technical characteristics of the instrument panel are:
• Rated connection voltage: 220 - 230 V AC
• Rated network frequency: 50 Hz
• Rated power: 148 W
• Electrical safety switchgear: 10 Α
• Maximum rated output of connected burner: 115 W
• Maximum rated output of connected pump: 33 W
• Class I.
The panel instrument is certified with the EU (Low Voltage) Directive 2014/35 and the
2014/30 / EU (EMC) Directive. The device does not contain asbestos and the components do
not contain mercury.

OSCAR –Series C -S
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The installation must only be operated when it is in a safe state. The normal
operation of the electrical equipment must be checked at regular intervals.
Additional components or electronic devices must be installed in accordance with
the manufacturer's instructions.
The values of the electrical fuses must be observed.
Η εγκατάσταση πρέπει να λειτουργεί μόνο εφόσον βρίσκεται σε ασφαλή κατάσταση. Η
ομαλή λειτουργία του ηλεκτρικού εξοπλισμού πρέπει να ελέγχεται ανά τακτά διαστήματα.
No maintenance is required by the user.
It is forbidden to use the appliance by children or persons with individuals
limited possibilities of movement and perception.
3.7 ELECTRICAL DIAGRAM

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3.8 CABLE ELECTRICAL CONNECTION (back metal cover)
The unit is ready to be connected to a socket.
The connection that has already been made (internal, hidden rear side of the galvanized
cover) is as follows based on the color of the cables:
3.9 SAFETY MEASURES IN BOILER ROOM
Install a fire extinguisher , a smoke sensor and a carbon monoxide detector.
Also keep a bucket of soil in the boiler room.
Light Blue (bridge)
Brown cable
Blue cable
Black (bridge)
Yellow
(grounding)
γείωση
Light blue (bridge)
Black bridge

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4. FIRST STARTING
BEFORE ANY OTHER ACTION, FILL IN THE SIPHON WITH WATER.
GAS LEAK HAZARD.
SIPHON
1. The first starting must be carried out by a licensed liquid fuel technician.
2. The switch on is been automatically. Following the instructions of boiler's operating manual.
The setting of the operating temperatures is done manually.
3. Ensure fuel leaks along the length of the oil supply pipes.
4. Ensure that there is no any water leakage along the entire length of the hydraulic
connection piping.
5. Testing and measurement of flue gas emissions is demanded after ignition and all checks.
6. Prior to first use by the owner, it is necessary to provide advice on proper use and
maintenance by the technician or Engineer.
POSSIBLE DIFFERENCES
A. The color of the instrument
panel (black or white)
B. The ON / OFF switch is
possibly to be located on the
left side of the panel

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5. GENERAL RECOMMENDATIONS
Before each new starting , after prolonged shutdown , confirm that:
1. There is water in the installation
2. The condensate siphon is filled with water.
3. The water supply and return valves of the boiler in the installation are
open and there are no leaks in the hydraulic network.
4. It is forbidden to the last user to change the settings of the burner. This is
required to only by a licensed technician.
5. DO NOT place flammable materials and fuel at a distance of less than 1.5 meters from
the unit.
6. During the first use, open the windows of the installation area and ensure adequate
ventilation, as strong smells are likely to occur. Also check for smoke leakage.
7. Before opening the control door, make sure the appliance is off.
8. Always check for antifreeze systems to cool the system and pipes for frost periods.
ALWAYS RISK OF SERIOUS DAMAGE AND EXPLOSION.
9. If water has been frozen, do not use the appliance and seek advice from your licensed
plumber. The installation must be kept full of water during the period of non-use of the
system
10. If the water has been frozen, do not use the appliance and seek advice from your
licensed plumber. The installation must be kept full of water during the period of non-use
of the system
6. SAFETY
The use of the compact unit is only permitted by adults who have read and
understood these operating instructions and operating instructions for the boiler
operating panel.
1. Unauthorized modification of the device is prohibited.
2. USE only spare parts recommended by OSCAR.
3. Ensure that the outdoor air outlet (conduit) in the unit space is not clogged. If the
opening or duct is blocked or closed, the unit is NOT allowed to operate. THERE IS A
DANGER OF DANGEROUS ACCIDENTS (combined damage and damage)