CS THERMOS Roma 15/18 User manual

Water stoves
Instructions for models:
Roma - Venexia - Murano - Thema H2O

Dear Customer,
We wish to thank you for choosing a CSTHERMOS stove and welcome you into our pellet/biomass heating world.
We remind you that our products are manufactured wholly in Italy with superb quality materials and are accurately
tested in compliance with the provisions of the safety regulations in force.
Great innovation and sophisticated design are added to this guarantee of quality and comfort.
This stove has been designed for domestic use.
This stove model is tted with an innovative and patented biomass burner (European Patent no. 09425188-1266 EP
2144001) capable of burning not only wooden pellets of all kinds (for instance consisting of bark and branches) but
also the biomass deriving from agricultural waste like almond-hazelnut shells, olive stones, agripellets.
An automatic cleaning system is managed by an electronic board and keeps the burner always clean, obtaining great
eciency and reliability of use. The modulating operation varies according to the set stove temperature and there-
fore allows optimal room heating. During the initial ignition phase (about 10 minutes), the burner automatically lls
with fuel, while resistors, heating up, trigger the ame. Once the ame has been detected by the combustion fume
detector, normal operation begins that, thanks to the microprocessor, allows changing the supply of fuel, obtaining
therefore ame modulation. The electronic board checks the temperature sensors, electrical motors and safety de-
vices continuously and, in case of an anomaly, stops their operation and shows this on the display (see alarm code
paragraph). The heating of the room is guaranteed by a circulator, tted internally and an anti-condensation valve
that ensures a constant return temperature to the stove, to prevent any condensation.

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cod. 6118005 ed. 06-2021
CONTENTS
Page
1 Safety regulations..............................................................................................................................................................4
2Models of stove dealt with in this manual..............................................................................................................8
3 Receiving the appliance..................................................................................................................................................9
4 Transport and handling................................................................................................................................................. 10
5 Part descriptions............................................................................................................................................................... 12
5.1 Roma 15/18/21/25, Venexia 15/18/21/25, Murano 15/18, Thema H2O............................................... 12
5.2 Stove dimensions................................................................................................................................................... 14
5.3 Pellet tank ................................................................................................................................................................. 17
5.4 Data plate.................................................................................................................................................................. 18
6 Stove technical data........................................................................................................................................................ 19
7 Fuel .......................................................................................................................................................................................... 22
8 Installation........................................................................................................................................................................... 23
8.1 Preinstallation.......................................................................................................................................................... 23
8.2 Flue.............................................................................................................................................................................. 24
8.3 Electrical arrangement......................................................................................................................................... 28
8.4 Hydraulic arrangement........................................................................................................................................ 28
8.5 Unpacking................................................................................................................................................................. 30
8.6 Setting up the stove.............................................................................................................................................. 31
8.7 Connecting the ue............................................................................................................................................... 32
8.8 Combustion air inlet.............................................................................................................................................. 34
8.9 Hydraulic connections.......................................................................................................................................... 35
8.10 Electrical connections........................................................................................................................................... 37
8.11 Electronic board...................................................................................................................................................... 38
9 Use ........................................................................................................................................................................................... 39
9.1 Display........................................................................................................................................................................ 39
9.2 Commissioning ....................................................................................................................................................... 40
9.3 Programming........................................................................................................................................................... 41
9.4 Operation phases................................................................................................................................................... 43
9.5 Alarm code list......................................................................................................................................................... 44
10 Cleaning ................................................................................................................................................................................ 45
10.1 Cleaning the outside............................................................................................................................................. 45
10.2 Cleaning the burner .............................................................................................................................................. 46
10.3 Cleaning the turbulators and emptying the ash drawer ......................................................................... 47
10.4 Cleaning and maintenance of other parts .................................................................................................... 48
11 Disposal................................................................................................................................................................................. 49
12 Notes....................................................................................................................................................................................... 50

4cod. 6118005 ed. 06-2021
Safety regulations for the user
This manual is an integral part of the product: it is important to read it in all its parts before in-
stalling or using the equipment. Ensure it is always available, also in case of a move/sale/trans-
fer to another owner, so that it can be consulted by the new user, installer or by any authorized
sta.
Any use, cleaning or maintenance other than as stated in this booklet must be considered in-
correct and may cause damage, injury or death, making the guarantee null and void and releas-
ing the Manufacturer from any liability.
Extraordinary maintenance must be carried out only by qualied personnel authorized by
the Dealer or Manufacturer.
This pictogram refers to a situation of immediate danger or a dangerous situation that might
cause injury or death.
This pictogram shows that it is necessary to behave in such a way as not to endanger the safety
of sta or cause damage to the equipment.
This pictogram hints at important technical information that must be taken into account by the
installer or user of the equipment.
Danger of burns
Danger of electric shock
Danger of crushing your hands
Danger of asphyxia
Fire hazard
Danger of crushing your feet
Obligation to use protection gloves
1 - SAFETY REGULATIONS

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cod. 6118005 ed. 06-2021
Safety or equipment automatic adjustment devices must be modied only by the manufactur-
er or by an authorized service centre or supplier, during the whole life of the system.
If the equipment is not to be used for a long time, switch o the main power switch.
If the equipment does not work or you notice functional or structural changes, disconnect
it from the power mains and contact a service centre authorized by the Manufacturer or
Dealer without attempting any DIY. As to repairs, always ask for original spare parts to be
used, in order to avoid problems and invalidating the warranty.
Any kind of tampering or replacement carried out by non-qualied personnel can be danger-
ous for the user and releases the Manufacturer from all civil and criminal liability.
Ensure the room where the unit is going to be installed is suitable and provided with air vents
with minimum openings in compliance with the legislation of the country of destination and
anyway sucient to obtain perfect combustion.
When the unit is delivered, check it is intact because vibrations or impacts during transport might
have loosened some components. Check the housing or the parts making up the equipment
have not been damaged. If this is the case, inform the installer and/or our customer service.
Do not leave any ammable containers or substances next to the stove, comply with the safety
distances mentioned in the manual.
Before connecting the equipment to the mains, always check the system data match those on
the equipment plate.
Use only the fuel recommended by the Manufacturer. The product must not be used as an in-
cinerator. It is absolutely forbidden to use liquid fuels.
Do not load the pellets into the burner manually.
The unit cannot be used by children or people with limited physical, sensory or mental capa-
bilities or without the necessary knowledge and experience. Children must not play with the
apparatus.
Non-compliance with these instructions can cause damages, injuries and even death and in-
validates the warranty.
Since potentially dangerous, any packaging material must be kept out of the reach of children
or animals and disposed of in compliance with local regulations.
Connect the earth cables of the equipment to the earth system of the building where it is in-
stalled.
The data plate supplies important technical information that is vital in case of a request for
maintenance or repair of the equipment: please do not remove, damage or modify it.
Do not open the burner while it is running.
Do not operate the unit with the glass broken.
Do not disconnect it by unplugging it when there is a ame on in the burner.
Do not use the unit to cook food or heat drinks.
Do not use the product as a supporting structure or as a ladder.
To prevent res, do not hang wet clothes on the unit to dry them, drying racks can be positioned
at a safe distance.

6cod. 6118005 ed. 06-2021
Do not wash the product with water jets. Water may penetrate into the unit and cause electric
shocks.
If the ignition system fails, it is absolutely forbidden to use ammable materials to light the
ame.
Disconnect the electrical supply before any maintenance or cleaning.
To ensure the equipment is in perfect use and safety conditions, we recommend that it is main-
tained and checked by a Service Centre authorized by the Manufacturer or Dealer at least once
a year.
The product warranty starts on the date when the equipment is switched on for the rst
time by an authorized engineer (dealer or Technical Service Centre).
Further risks
The stove has been conceived, designed and built taking all the applicable Safety Regulations
currently in force in the country of manufacture into account. Even if all possible precautions
to comply with the Regulations currently in force have been taken, the following risks can still
apply:
Risk of BURNS in accessing the inspection and cleaning doors with the ame still on or not
completely cooled down.
Risk of ELECTRICAL SHOCK.
For a correct electrical connection as well as safe protection, the
thermo-stove must be connected to a thermal dierential with a trigger threshold not exceed-
ing 30 mA, in compliance with the regulations in force.
Risk of HAND INJURY during the opening and cleaning operations and/or maintenance of the
supply auger, burner and ash drawer. We recommend suitable Personal Protection Equipment
(PPE), such as gloves, is used. When disassembling some parts of the equipment and then reas-
sembling them, pay attention to the risk of crushing your hands.
Risk of ASPHYXIA if there is no correct fume expulsion. We advise you to periodically inspect
and keep the ue and re outlets clean.
Risk of FIRE if ammable objects are placed on the surface of the unit or if solid or liquid am-
mable materials are positioned near it.
Draught conditions unsuitable to the ue, excessive fuel humidity or high ash residue in the
combustion chamber, can cause ignition failures that must not be considered a fault in the
product.

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cod. 6118005 ed. 06-2021
The company accepts no liability for any damages that may derive, either directly or indi-
rectly, to people, animals or property due to the non-compliance with all the provisions
listed in this manual and, in particular, concerning the warnings with regard to the instal-
lation, use and maintenance of the apparatus.

8cod. 6118005 ed. 06-2021
2 - MODELS DEALT WITH IN THIS MANUAL
Venexia
15/18
Murano
15/18
Venexia
21/25
Thema H2O
16/21
Roma
15/18
Roma
21/25

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cod. 6118005 ed. 06-2021
3 - RECEIVING THE APPLIANCE
When you receive the equipment, check its packaging is intact. In case of visible damage or if some pieces
are missing, do not install it, but contact the Manufacturer straight away.
If no anomaly is found, the product can be installed.
Handle the equipment following the Manufacturer’s instructions shown on the packaging and in this manu-
al. Use personal protection equipment all the time.
The means and method of transport must be chosen by the person responsible for handling, according to
the equipment weight and size. Handling must guarantee the safety of the people directly involved in the
installation.
CSTHERMOS

10 cod. 6118005 ed. 06-2021
4 - TRANSPORT AND HANDLING
The apparatus must be lifted with a winch tted with a hook (A) and handled with a transpallet or forklift
truck of suitable capacity.
The area of movement must be free from objects or people not involved in the transport operation.
If the equipment is handled using a winch, it is necessary to use some spreader bars (C) between the lifting
ropes, to prevent the unit from being damaged and ensure no excessive pressure is applied to the packaging
or machine itself.
Lifting with a winch tted with a hook
Use hooks of capacity and material suitable to the weight to be lifted. Ensure the safety lock (D) is in the cor-
rect position while lifting.
DO NOT move the equipment if the eld of vision is poor or
if there are obstacles along the way (e.g. electrical cables,
lintels, etc.). The range of action of the lifting equipment
must be kept free from people when the loads are lifted.
Shifting must always be vertical. Use steel hooks, chains or
cables in perfect condition, of a suitable material and ca-
pacity and without any joints or extensions (E). Carry out
periodic checks to guarantee eciency.
To anchor the unit, pass the ropes or chains through the
pallet holes (B), paying attention it is kept perfectly level.
Check the atness of the ground where the lifting equip-
ment is standing, making sure it is stable and not prone to
subsidence.
Do not move the lifting equipment during the operation.
Before starting lifting, check correct anchoring to the men-
tioned points and the centre of gravity, then slowly lift the
packaged equipment to the minimum height required and
move it carefully to avoid dangerous vibrations.
Take care of the control panel that must undergo no im-
pacts or be exposed to the weather (rain, humidity): any
damage may aect its operation.
Avoid sudden stops of the lifting or descending movement, in order to avoid dangerous oscillations.
A
C
OK!
B
OK!
OK!
D
E

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cod. 6118005 ed. 06-2021
Lifting with a transpallet or forklift truck
If the transport is done using a transpallet, ensure it is adequate to the weight and size of the packaged
equipment. Insert the forks into the points provided for handling (usually in the central position), to keep the
centre of gravity of the load balanced. Move the equipment carefully, avoiding sudden movements.
If the transport is done with a forklift truck, ensure this is strong enough to withstand the weight of the
equipment and that this can be moved safely, without any risk of it falling.
Transport with a van
If transport is done using a van, the apparatus must be xed properly inside it, using ropes, so that it cannot
move while handling.
OK!
OK!

12 cod. 6118005 ed. 06-2021
5 - PART DESCRIPTIONS
Description
1) Smoke exhaust arrangement
2) Fuel tank lid
3) Technical data label
4) Top cover panel
5) Display
6) Turbulators
5.1 Roma 15/18/21/25, Venexia 15/18/21/25, Murano 15/18, Thema H2O 16/21
3
1
2
5
4
10
9
8
7
6
11
12
3
1
2
5
10
9
8
7
6
11
12
4
3
2
5
4
10
9
8
7
6
11
1
12
3
1
2
4
5
10
9
8
7
12
6
11
Roma
15/18/21/25
Venexia
15/18/21/25
Murano
15/18
Thema H2O
16/21
7) Burner
8) Glass cleaning air adjuster
9) Anti-explosion valve
10) Ash drawer
11) Front door
12) Pressure gauge

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Description
13) Automatic air vent
14) Manual air vent
15) Safety thermostat
16) Safety thermostat
17) Electrical socket
18) Air intake
17
18
20
19
21
2223
16
15
13
14
17
18
20
19
21
2223
16
15
13
14
17
18
20
19
21
2223
16
15
13
14
19
22
15
23
18
20
14
16
17
13 21
Roma
15/18/21/25
Venexia
15/18/21/25
Murano
15/18
Thema H2O
16/21
19) Circulator
20) Smoke outlet motor
21) Expansion tank
22) Anti-condensation valve
23) Safety valve 3 bar

14 cod. 6118005 ed. 06-2021
5.2 Stove dimensions
630
80
82
605
203
403
648
1131
138
31681
260
1206
6 5
3
2
1
8
4
7
630
80
82,76
671,76
203
403
648
1234
138
81 316
260
1306
6 5
3
2
1
8
4
7
Roma 21/25
Roma 15/18
1. Top fume outlet Ø 80mm
2. Back fume outlet Ø 80mm
3. External air intake Ø 60mm
4. System return 3/4”
5. Safety valve 3 bar
6. Boiler loading and unloading cock
7. System delivery 3/4”
8. Manual vent

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cod. 6118005 ed. 06-2021
6 5
3
2
1
8
4
7
203
403
648
1135
140
316
81
260
1207
577
80
82
630
203
403
648
1234
138
31681
260
1307
644
80
82
630
6 5
3
2
1
8
4
7
Venexia 21/25
Venexia 15/18
1. Top fume outlet Ø 80mm
2. Back fume outlet Ø 80mm
3. External air intake Ø 60mm
4. System return 3/4”
5. Safety valve 3 bar
6. Boiler loading and unloading cock
7. System delivery 3/4”
8. Manual vent

16 cod. 6118005 ed. 06-2021
680
560
80
80
193
388
640
1122
149
33498
249
1194
6 5
3
2
1
8
4
7
1
8
125
167
194
750
1130
1260
150
356
393
194
113
1050
6 5
3
2
4
7
Murano 15/18
Thema H2O 16/21
1. Top fume outlet Ø 80mm
2. Back fume outlet Ø 80mm
3. External air intake Ø 60mm
4. System return 3/4”
5. Safety valve 3 bar
6. Boiler loading and unloading cock
7. System delivery 3/4”
8. Manual vent

17
cod. 6118005 ed. 06-2021
5.3 Pellet tank
All stove models are tted with an internal container to load the pellets. Capacity varies according to the model.
The container is always in the top part of the appliance and is protected by a lid.
To load, lift the lid and let the pellets slide into the container.
Find below an example with a stove model, the system for the other stoves is exactly the same.
Container capacity (kg)
Roma 15 21
Roma 18 21
Roma 21 32
Roma 25 32
Venexia 15 21
Venexia 18 21
Venexia 21 32
Venexia 25 32
Murano 15 21
Murano 18 21
Thema H2O 16 21
Thema H2O 21 21

18 cod. 6118005 ed. 06-2021
5.4 Stove serial plate
The plate with the data regarding the stove is located on its back. It supplies important technical information that is vital
in case of a request for maintenance or repair of the equipment: please do not remove, damage or modify it.
MODELLO
kW
kW
kW
kW
kW
XX-XX-XXX
Hz
W
bar
g/Nm3
%
POTENZA TERM. RESA MAX
POTENZA TERM. RESA MIN
kW
POTENZA NOM. ALL’ACQUA
POTENZA NOM. ALL’AMBIENTE
POT. RIDOTTA ALL’ACQUA
POT. RIDOTTA ALL’AMBIENTE
mg/Nm3
PP 13% O2
DISTANZA MINIMA DA MATERIALI INFIAMMABILI: 100 mm SU TUTTI I LATI
APPARECCHIO PER RISCALDAMENTO DOMESTICO ALIMENTATO A PELLET DI LEGNO
USARE SOLO I COMBUSTIBILI RACCOMANDATI - LEGGERE E SEGUIRE LE ISTRUZIONI D’USO
NUMERO DI SERIE
EN 14785: 2006
TENSIONE NOMINALE
POT. ELETTRICA NOMINALE
PRESSIONE MAX ESERCIZIO
CO 13% O2NOMINALE
g/Nm3
CO 13% O2RIDOTTA
RENDIMENTO POT. NOMINALE
%
RENDIMENTO POT. RIDOTTA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1Indicates the stove model you have.
2Indicates the heat output at maximum power.
3Indicates the heat output at minimum power.
4Indicates the heat output actually delivered into the water at maximum power.
5Indicates the heat output actually delivered to the environment at maximum power.
6Indicates the heat output actually delivered into the water at minimum power.
7Indicates the heat output actually delivered to the environment at minimum power.
8
Indicates how much heat generated by combustion can actually be released into the environment at maximum power.
9Indicates the serial number of your boiler: period of the year - year of construction - construction specications.
10 Indicates the electric operating characteristics of the stove.
11 Indicates the power generated or absorbed during operation.
12 Indicates the maximum pressure value that can occur along the piping axis for the heaviest hydraulic operation of
the system.
13 Indicates the value of carbon and oxygen emitted at maximum power.
14 Indicates the value of carbon and oxygen released at minimum power.
15 Indicates the value of the primary particulate emitted at maximum power.
16
Indicates how much heat generated by combustion can actually be released into the environment at minimum power .

19
cod. 6118005 ed. 06-2021
6 - STOVE TECHNICAL DATA
TECHNICAL DATA
UNITS OF
MEASUREMENT
ROMA 15 ROMA 18 ROMA 21 ROMA 25
THERMAL POWER INPUT
(pellets) kW 16.5* 18.4* 20.8* 25.6*
THERMAL POWER OUTPUT
(pellets) kW 15.4* 17.0* 19.8* 24.0*
THERMAL POWER OUTPUT TO THE WATER
(pellets) kW 13.6* 15.3* 18.0* 22.1*
Combustion EFFICIENCY
(pellets) % 93.3* 92.5* 95.0* 93.4*
CO (13% O2) RATED POWER g/Nm30.16 0.21 0.07 0.08
CO (13% O2) REDUCED POWER g/Nm30.27 0.27 0.32 0.32
PP (13% O2)mg/Nm312.2 11.8 12.1 11.4
FUEL
Wood PELLET -
BIOMASS Wood PELLET - BIOMASS Wood PELLET - BIOMASS Wood PELLET - BIOMASS
CONSUMPTION AT MAXIMUM POWER
(pellets) Kg/h 3.4 max** 3.8 max** 4.4 max** 5.2 max**
PELLET TANK CAPACITY Kg 21 21 32 32
HEATABLE VOLUME m3180-430*** 180-470*** 300-540*** 300-640***
SMOKE OUTLET DIAMETER mm 80 80 80 80
MAXIMUM SMOKE TEMPERATURE °C 160 160 160 160
POWER SUPPLY V V230~ / 50Hz V230~ / 50Hz V230~ / 50Hz V230~ / 50Hz
MAXIMUM ABSORPTION A3333
AVERAGE ELECTRICAL POWER IN
OPERATION W 130 130 130 130
MAXIMUM ELECTRICAL POWER W 700 700 700 700
BOILER MAXIMUM TEMPERATURE °C 80 80 80 80
WATER MAXIMUM TEMPERATURE °C 65 65 65 65
MAXIMUM OPERATING PRESSURE bar 3 3 3 3
BOILER WATER CONTENT l 32 32 52 52
BOILER NET WEIGHT Kg 220-250 220-250 270 270
MINIMUM DRAUGHT REQUIRED Pa 6666
ENERGY CLASS A++ A++ A++ A++
ENVIRONMENTAL QUALITY CLASS
(Ministerial Decree 186)
4 stars 4 stars 5 stars 4 stars
The data relating to the production of hot water were measured with the setting of the hot water temperature at 55°C,
with the cold water inlet temperature at 15°C and with the boiler at maximum power.
*
The re and rated power as well as the eciency are measured in a lab test in optimal installation conditions.
** The data was recorded in a lab test in optimal conditions. Hourly consumption can vary according to the type of
pellets used and the installation.
*** The heatable volume is subject to variation according to installation conditions, type of house insulation and
external climatic conditions connected with the geographic location.
N.B.: The fuel humidity must not exceed 25%.

20 cod. 6118005 ed. 06-2021
TECHNICAL DATA
UNITS OF
MEASUREMENT
VENEXIA 15 VENEXIA 18 VENEXIA 21 VENEXIA 25
THERMAL POWER INPUT
(pellets) kW 16.5* 18.4* 20.8* 25.6*
THERMAL POWER OUTPUT
(pellets) kW 15.4* 17.0* 19.8* 24.0*
THERMAL POWER OUTPUT TO THE WATER
(pellets) kW 13.6* 15.3* 18.0* 22.1*
Combustion EFFICIENCY
(pellets) % 93.3* 92.5* 95.0* 93.4*
CO (13% O2) RATED POWER g/Nm30.16 0.21 0.07 0.08
CO (13% O2) REDUCED POWER g/Nm30.27 0.27 0.32 0.32
PP (13% O2)mg/Nm312.2 11.8 12.1 11.4
FUEL
Wood PELLET -
BIOMASS Wood PELLET - BIOMASS Wood PELLET - BIOMASS Wood PELLET - BIOMASS
CONSUMPTION AT MAXIMUM POWER
(pellets) Kg/h 3.4 max** 3.8 max** 4.4 max** 5.2 max**
PELLET TANK CAPACITY Kg 21 21 32 32
HEATABLE VOLUME m3180-430*** 180-470*** 300-540*** 300-640***
SMOKE OUTLET DIAMETER mm 80 80 80 80
MAXIMUM SMOKE TEMPERATURE °C 160 160 160 160
POWER SUPPLY V V230~ / 50Hz V230~ / 50Hz V230~ / 50Hz V230~ / 50Hz
MAXIMUM ABSORPTION A3333
AVERAGE ELECTRICAL POWER IN
OPERATION W 130 130 130 130
MAXIMUM ELECTRICAL POWER W 700 700 700 700
BOILER MAXIMUM TEMPERATURE °C 80 80 80 80
WATER MAXIMUM TEMPERATURE °C 65 65 65 65
MAXIMUM OPERATING PRESSURE bar 3 3 3 3
BOILER WATER CONTENT l 32 32 52 52
BOILER NET WEIGHT Kg 220-250 220-250 270 270
MINIMUM DRAUGHT REQUIRED Pa 6666
ENERGY CLASS A++ A++ A++ A++
ENVIRONMENTAL QUALITY CLASS
(Ministerial Decree 186)
4 stars 4 stars 5 stars 4 stars
The data relating to the production of hot water were measured with the setting of the hot water temperature at 55°C,
with the cold water inlet temperature at 15°C and with the boiler at maximum power.
* The re and rated power as well as the eciency are measured in a lab test in optimal installation conditions.
** The data was recorded in a lab test in optimal conditions. Hourly consumption can vary according to the type of
pellets used and the installation.
*** The heatable volume is subject to variation according to installation conditions, type of house insulation and
external climatic conditions connected with the geographic location.
N.B.: The fuel humidity must not exceed 25%.