klover THERMOAURA Quick start guide

ENGLISH
rev 1.1 date 25/01/2021
Pellet boiler stove
THERMOAURA,
THERMOCLASS,
CLASS HYDRA,
STYLE 120 PLUS
INSTALLATION, USE, MAINTENANCE AND
HELPFUL TIPS

SERVICE DECLARATION
Ref. Annex III EU Regulation no. 305/2011
DoP/KLOVER-054
1. Identification number
:
HA, HCL, CLH, SLP120
2. Model and/or lot no. and/or serial no. (Art. 11-4)
:
ThermoAura, ThermoClass, Class Hydra, Style 120
Plus
3. Intended use of the product according to the relevant
harmonised technical specification
:
Wood pellet-fired domestic heating appliance
4. Name or trademark of the manufacturer (Art11-5)
:
KLOVER s.r.l.
I - 37047 San Bonifacio (VR) –Via A. Volta, 8
5. Name and address of the representative (Art.12-2)
:
-
6. Assessment and verification system of the
performance constancy (Annex 5)
:
System 3
7. Notified laboratory
:
NB 0476
KIWA CERMET ITALIA S.p.A.
Number of test report (based on System 3)
:
2007434 / C-498
8. Declared performances
HARMONISED TECHNICAL SPECIFICATION
EN 14785
PERFORMANCE FEATURES
PERFORMANCE
Fire resistance
A1
Distance from combustible material
200 mm
Fuel spillage risk
Compliant
Emission of combustion products
-Nominal power
-Reduced power
CO at 13% of O20.007 %
CO at 13% of O20.038 %
Effective temperature
Compliant
Electrical safety
Compliant
Accessibility and cleaning
Compliant
Maximum operating pressure
2.5 bar
Mechanical strength
NPD (performance not determined)
Thermal performance
-Nominal power (reduced)
-Nominal power (reduced) yielded to the
environment
-Nominal power (reduced) yielded to water
15.0 kW (4.3 kW)
3.3 kW (1.3 kW)
11.7 kW (3.0 kW)
Yield
-Nominal power
-Reduced power
ɳ 95.9 %
ɳ 96.8 %
Flue gas temperature
-Nominal power
-Reduced power
T 80.0 °C
T 49.4 °C
9. The performance of the product referred to in points 1 and 2 is compliant with the declared performance in
point 8.
This declaration is released on the sole responsibility of the manufacturer referred to in point 4.
Signed in the name and on behalf of the manufacturer by:
San Bonifacio (VR), 09/05/2019
Mario Muraro
Chairman of the Board

1
CONTENTS
CONTENTS ........................................................................................................................................................................ 1
INTRODUCTION................................................................................................................................................................. 3
IMPORTANT SAFETY INSTRUCTIONS..............................................................................................................................................................3
THE MACHINE AND THE PELLETS ................................................................................................................................. 4
COMPONENTS OF THE APPLIANCE................................................................................................................................................................4
OVERALL DIMENSIONS FOR THERMOAURA................................................................................................................................................7
OVERALL DIMENSIONS FOR THERMOCLASS..............................................................................................................................................8
CONNECTIONS DATA SHEET FOR THERMOAURA........................................................................................................................................9
CONNECTIONS DATA SHEET FOR THERMOCLASS....................................................................................................................................10
TECHNICAL SPECIFICATIONS.....................................................................................................................................................................11
PELLET PROPERTIES ................................................................................................................................................................................12
REQUIREMENTS OF THE PLACE OF INSTALLATION................................................................................................. 12
POSITIONING ...........................................................................................................................................................................................12
SPACES AROUND AND ABOVE THE APPLIANCE.............................................................................................................................................13
EXTERNAL AIR INTAKE ..............................................................................................................................................................................13
THE FLUE AND CONNECTION TO THE SAME .................................................................................................................................................14
CHIMNEY.................................................................................................................................................................................................15
DISTANCE < 5M......................................................................................................................................................... 16
DISTANCE > 5 M ....................................................................................................................................................... 16
0.5 M............................................................................................................................................................................... 16
0.5 M............................................................................................................................................................................... 16
ELECTRICAL CONNECTION .......................................................................................................................................... 16
CONTROL OF ANY COUPLED BOILER...........................................................................................................................................................16
CONTROL OF A POSSIBLE THREE-WAY MOTORIZED VALVE FOR DHW SYSTEM MANAGEMENT ..........................................................................17
CONNECTION TO THE ROOM THERMOSTAT..................................................................................................................................................17
HYDRAULIC CONNECTION............................................................................................................................................ 18
THE DISPLAY .................................................................................................................................................................. 19
THE MENU ....................................................................................................................................................................... 21
INITIAL START-UP .......................................................................................................................................................... 25
SYSTEM CONFIGURATION..........................................................................................................................................................................25
INITIAL FILLING OF THE SYSTEM .................................................................................................................................................................27
PELLET LOADING AND CONNECTION TO THE MAINS POWER SUPPLY ..............................................................................................................27
IGNITION CYCLE .......................................................................................................................................................................................27
SWITCH-OFF CYCLE..................................................................................................................................................................................28
MODIFYING THE WORKING POWER .............................................................................................................................................................28
CHANGING THE WATER TEMPERATURE BOILER OR PUFFER ..........................................................................................................................28
CHANGING THE AIR FAN SPEED..................................................................................................................................................................29
PROBLEMS, ALARMS, USEFUL TIPS ........................................................................................................................... 30
USEFUL INFO…........................................................................................................................................................................................30
WHAT HAPPENS IF…................................................................................................................................................................................30
ALARM SIGNALS .......................................................................................................................................................................................31
CLEANING AND MAINTENANCE ................................................................................................................................... 32
PRECAUTIONS BEFORE CLEANING..............................................................................................................................................................32
ROUTINE CLEANING..................................................................................................................................................................................32
NON-ROUTINE CLEANING ..........................................................................................................................................................................33
ANNUAL CLEANING ...................................................................................................................................................................................35
CLEANING THE CERAMIC GLASS.................................................................................................................................................................37
CLEANING THE FLUE.................................................................................................................................................................................37
MAINTENANCE .........................................................................................................................................................................................37
PCB PARAMETERS ........................................................................................................................................................ 37
PARAMETERS TABLE.................................................................................................................................................................................38
WIRING DIAGRAM........................................................................................................................................................... 40
STANDARD WARRANTY CONDITIONS......................................................................................................................... 41

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Dear client,
First of all we would like to thank you for choosing a “KLOVER” product and we hope you will be satisfied with this
product.
Carefully read the manual and warranty certificate on the last page of this User guide.
In thanking you again for the trust accorded to us, we wish to inform you that these models are the result of forty years of
experience in the manufacture of solid fuel products using water as the heat transfer fluid.
Every single detail of the product is manufactured by qualified staff, using the most advanced equipment.
The manual contains a detailed description of the appliance and its operation, instructions for proper installation, basic
maintenance and control points, which must be periodically performed; furthermore it contains practical advice which
helps to obtain maximum performance from the appliance with minimum fuel consumption.
Stay warm with KLOVER!
Technical Support
Klover pellet appliance is are imported and distributed by Firepower Heating, Flightway, Dunkeswell, Honiton, Devon,
EX14 4RD.
UK technical and product support is provided by Firepower Heating who can be reached on 0844 3320156.
Certificate number : HTSMCS1801/09
The Clean Air Act 1993 and Smoke Control Areas
Under the Clean Air Act local authorithies may declare the whole or part of the district of the authority to be a smoke
control area. It is an offence to emit smoke from a chimney of a building, from a furnace or from any fixed boiler if located
in a designated smoke control area. It is also an offence to aquire an “unauthorized fuel”for use within a smoke control
area unless it is used in an “exempt”appliance (“exempted”from the controls which generally apply in the smoke control
area). In England appliances are exempted by publication on a list by the Secretary of State in accordance with changes
made to sections 20 and 21 of the Clean Air Act 1993 by section 15 of the Deregulation Act 2015. Similarlt in Scotland
appliances are exempted by publication on a list by Scottish Ministers under section 50 of the Regulatory Reform
(Scotland) Act 2014. In Wales and Northern Ireland these are authorized by regulations made by Wesh Ministers and by
the Department of the Environment respectively. Further information on the requirements of the Clean Air Act can be
found here at: https://www.gov.uk/smoke-control-area-rules
Your local authority is responsible for implementing the Clean Air Act 1993 including designation and supervision of
smoke control areas and you can contect them for details of Clean Air Act requirements.
The Thermoaura 15kW has been recommended as suitable for use in smoke control areas when burning wood pellets.
Copyright
All rights reserved. The reproduction of any part of this manual, in any form, without the explicit written permission of
KLOVER Srl. is forbidden. The content of this manual may be modified without notice. Although the documentation
contained in this manual has been carefully compiled and checked, KLOVER srl cannot be held liable for any damages
arising from the use of the same.
Copyright © 2019 KLOVER srl

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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INTRODUCTION
Important safety instructions
Please read these instructions before installing and using the product.
-The installation and initial start-up of the appliance must be performed by skilled personnel trained in the relevant
safety standards. They will be responsible for the definitive installation of the appliance and its proper operation.
KLOVER srl shall not be held liable if these precautions are not observed.
-During the installation and use of the appliance, all local regulations - including those referring to national and
European Standards - must be observed.
-Connect the flue gas outlet to a flue with the specifications described in the “Flue and its connection” section of this
User guide.
-The appliance is not suitable for installation on a shared flue system.
-If the flue should catch fire, use appropriate fire extinguishing equipment or call the fire brigade.
-Connect the product to an earthed power socket. Avoid using sockets controlled by switches or automatic timers.
-Do not use the power supply cable if damaged or worn.
-If a multiple socket is used, make sure that the total voltage of the connected devices does not exceed the rated
voltage for the socket. Also make sure that the total voltage of all the devices connected to the socket does not
exceed the maximum permitted level.
-The plug on the appliance’s power cable should be connected only once the assembly and installation of the
appliance is complete. It should remain accessible after installation if the appliance is not fitted with a suitable and
accessible two-pole switch.
-Do not use flammable substances to clean the appliance or its parts.
-Do not leave flammable containers and substances in the place where the appliance is installed.
-The appliance works exclusively with wood pellets and only with the hearth door shut.
-NEVER open the appliance’s door during normal operation and avoid using it when the glass is broken or cracked.
-The use of poor-quality pellets or any other material can damage the appliance’s functions besides voiding the
warranty and exempting the manufacturer from all liability.
-Do not use the appliance as an incinerator or for any use other than that for which it was designed.
-Do not use fuels other than those recommended.
-Do not use liquid fuels.
-The appliance, and its outer surfaces in particular, become very hot to the touch during operation; handle with
caution in order to avoid burns.
-Keep fuel and flammable materials at a safe distance.
-Only use original spare parts recommended by the manufacturer.
-Do not make any unauthorised modifications to the appliance.
-Do not touch the hot components of the product (ceramic glass, flue pipe) during normal operation.
-Never touch the appliance if you are barefoot and/or if you have wet or damp parts of the body.
-Use the appropriate button to switch off the electrical panel. Do not disconnect the power supply cable while the
appliance is operating.
-Switch the appliance off in case of a fault or malfunctions.
-During the ignition phase and normal operation of the appliance, maintain the necessary safety distance and do not
remain standing in front of it.
-Keep children away from the appliance when it is running since they could get burned by touching its hot
components.
-Do not leave the packaging elements within reach of children or unassisted disabled persons.
-Children and inexperienced people must not be allowed to use the appliance.
-The appliance may be used by children no younger than 8 years of age and people with reduced physical, sensory or
mental capabilities, or those without experience of the appliance, as long as they are supervised or have received
instructions on how to use the appliance safely and understand the hazards inherent to the appliance.
-Children should not play with the appliance.
-User maintenance and cleaning operations should not be carried out by unsupervised children.
-Clean the appliance only when it is cold.
-Clean the brazier whenever the ignition fails and nonetheless at least once a week.
-Do not use the appliance in ways other than those indicated in this user guide.
-The appliance is designed for indoor use only.

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
-The appliance is designed for heating water and should therefore be connected to a plumbing system (radiators,
under-floor heaters, etc.). This system should be suitably designed and sized to distribute the power generated by
the appliance.
-This user guide constitutes an integral part of the appliance. If the product is sold to another user, this manual must
be passed on to the new owner.
KLOVER S.R.L. DECLINES ALL LIABILITY IN CASE OF ACCIDENTS DUE TO FAILURE TO COMPLY WITH THE
SPECIFICATIONS OF THIS MANUAL.
KLOVER S.R.L. DECLINES ALL LIABILITY DUE TO INCORRECT USE OF THE PRODUCT BY THE USER,
UNAUTHORISED MODIFICATION AND/OR REPAIRS, AND USE OF NON-ORIGINAL SPARE PARTS OR SPARE
PARTS NOT SPECIFICALLY DESIGNED FOR USE ON THIS PRODUCT MODEL.
KLOVER S.R.L. SHALL NOT BE HELD LIABLE FOR THE STOVE'S INSTALLATION. THE INSTALLER IS THE
SOLE PARTY RESPONSIBLE FOR THIS OPERATION AND IS ALSO ENTRUSTED WITH CHECKING THE FLUE,
EXTERNAL AIR VENT AND THE CORRECTNESS OF THE PROPOSED INSTALLATION SOLUTIONS. ALL THE
SAFETY REGULATIONS SET OUT IN THE SPECIFIC LAWS IN FORCE IN THE COUNTRY WHERE THE MACHINE
IS INSTALLED MUST BE OBSERVED.
NON-ROUTINE MAINTENANCE MUST ONLY BE PERFORMED BY AUTHORISED AND QUALIFIED STAFF.
To ensure the validity of the warranty, the user must comply with the instructions contained in this guide and, in
particular, must:
-Use the appliance within its operating limits;
-Regularly perform all maintenance activities;
-Authorise expert and competent people to use the appliance.
Failure to comply with the instructions contained in this guide shall automatically void the warranty.
THE MACHINE AND THE PELLETS
Components of the appliance
The table below shows the standard features of the appliance:
Expansion tank
8 l
Safety valve
2.5 bar
Pressure gauge
0 –4 bar
Automatic air vent valve
No
Automatic air vent valve
Yes
Heating system pump
Yes. Mod.25/70
Electrical setting for boiler / puffer sensor
Yes
Remote control
Optional
Wi-Fi management module
Optional
The appliance is delivered with the following equipment:
-1 user, installation and maintenance guide;
-1 power supply cable;
-1 cleaning hook for the front heat exchanger;
-1 conventional warranty certificate.
The images below show certain details of the appliance:
Hook for cleaning the
front heat exchanger.

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Delivery pipe.
Return pipe.
Display.
Opening
for optional connection to
safety valve.
REAR VIEW
TOP VIEW
Intake pipe.
Flue gas
outlet.
R.T. terminal for room
thermostat connection.
Anti-interference filter.
Main switch, connection for
power supply cable with 2
built-in fuses (4A 250V).
Safety thermostat with
manual reset.
Terminal
for optional connection to
puffer / boiler probe.
CE label
with technical data, serial
number and model.
Upper knobs
for cleaning internal flue
gas turn.

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Pressure gauge.
High-efficiency pump
with speed selector.
Safety valve
(2.5 bar).
Boiler unit drain
cock.
Control
unit.
Flue pressure switch.
Flue gas intake device.
Pellet tank.
Front fan for hot air.
Overpressure valve.
RIGHT SIDE VIEW
LEFT SIDE VIEW
Flue gas turn side
inspection plate.
Expansion tank
8 l with pre-load 1 bar.
Automatic air vent
valve (jolly).

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Overall dimensions for THERMOAURA

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Overall dimensions for THERMOCLASS

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Connections data sheet for THERMOAURA
Description of connections
M= System Delivery
3/4" M
R= System Return
3/4" M
X= Safety valve drain
1/2" F
Sf= Rear flue gas outlet
80 mm M
A = Intake pipe
40 mm
E =Electricity connection
REAR VIEW

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Connections data sheet for THERMOCLASS
Description of connections
M= System Delivery
3/4" M
R= System Return
3/4" M
X= Safety valve drain
1/2" F
Sf= Rear flue gas outlet
80 mm M
A = Intake pipe
40 mm
E =Electricity connection
REAR VIEW

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Technical Specifications
Heat input (nominal setting)
kW (Kcal/h)
15.6 (13,420)
Heat input (reduced setting)
kW (Kcal/h)
4.4 (3,780)
Nominal thermal output
kW (Kcal/h)
15.0 (12,900)
Reduced thermal power
kW (Kcal/h)
4.3 (3,700)
Nominal heat output ceded to water
kW (Kcal/h)
11.7 (10,060)
Nominal heat output ceded to the environment
kW (Kcal/h)
3.3 (2,840)
Reduced heat output ceded to water
kW (Kcal/h)
3.0 (2,580)
Reduced heat output ceded to the environment
kW (Kcal/h)
1.3 (1,120)
Combustion efficiency at nominal thermal power
%
95.9
Combustion efficiency at reduced thermal power
%
96.8
CO at 13% oxygen at nominal thermal power
%
0.007
CO at 13% oxygen at reduced thermal power
%
0.038
Maximum power uptake
Watt
400*
Power uptake during operation at nominal thermal power
Watt
56
Power uptake during operation at reduced thermal power
Watt
14
Power uptake in stand-by
Watt
3.0
Nominal voltage
V
230
Nominal frequency
Hz
50
Expansion vessel litres/preloading bar
6 / 1
Maximum operating/recommended pressure
bar
2.5 / 1.5
Flue outlet diameter
mm
80
Air intake pipe diameter
mm
40
Minimum chimney draught at nominal thermal power
Pa
12.1
Minimum chimney draught at reduced power
Pa
7.7
Combustion gas mass at nominal thermal power
g/s
8.9
Combustion gas mass at reduced power
g/s
4.1
Pellet tank capacity
Kg
20
Average exhaust flue gas temperature at nominal thermal power
°C
80.0
Average exhaust flue gas temperature at reduced power
°C
49.4
Boiler unit capacity
litres
15
Width
mm
520
Height
mm
1100
Depth
mm
480
Minimum safety distance from flammable materials
(side / rear / upper / front)
mm
200 / 200 / 750 / 800
Weight
Kg
145
* Power consumption only during the ignition cycle.
The appliance's heat output may vary depending on the type of pellets used.

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
Pellet properties
The appliance has been tested with all types of pellets available on the market. The pellets must have the following
properties:
-Diameter 6 mm.
-Maximum length 35 mm.
-Maximum humidity content 8 –9 %.
-100% wood. Totally additive-free.
-Maximum ash residue 1.1 %.
To obtain good performance from the appliance, we recommend using good quality pellets. Pellets should be poured
into the tank using a shovel, and not directly from the bag.
Good quality pellets should have the following properties:
-Constant diameter cylinders with a smooth, shiny surface;
-There should not be a lot of sawdust inside the packaging;
-After grabbing a bunch of pellets and placing them into a container filled with water, good-quality pellets will sink and
poor-quality ones will tend to float;
-The quality certification data, in particular conformity to international standards such as EN14961-2, DIN 51731 and
O-NORM M7135, should be indicated on the packaging;
-The packages should be intact since pellets tend to absorb humidity. Humidity not only reduces the calorific value
and increases the amount of flue gases expelled, but also causes swelling of the product which may create problems
with the appliance.
The production of pellets must be compliant with some international standards (such as EN14961-2, DIN 51731 and O-
NORM M7135) which establish minimum values for quality checks on pellets. To facilitate the right choice of the
combustible material you can find below one of the most common certification marks identifying the quality of the pellets:
The use of poor quality pellets or any other material can damage the appliance operation, voiding the warranty
and exempting the manufacturer from all liability.
In order to guarantee trouble-free combustion, the pellets must be stored in a dry place.
REQUIREMENTS OF THE PLACE OF INSTALLATION
Positioning
The initial phase for best installation of the appliance is to determine its optimum location; the following elements need to
be considered:
-The possibility of creating an external air vent;
-The possibility of creating a straight flue, preferably coaxial to the outlet of the appliance;
-Proximity to the main water drain and/or the boiler (if one already exists);
-Proximity or ease of connection to the water system;
-Ease of access for cleaning the appliance, the flue gas exhaust pipes and the flue.
Indication of the standard,
base reference for the quality
classes ENplus
Indication of the quality
class of the certified pellet
(preferable A1)
IT xxx
Code of the certified company
consisting of two elements:
-Symbol of the country of
production (example “IT”)
-Progressive number assigned at
the acquisition of the
certification (example "xxx")

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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EN - Rev. 1.1
The unit must be installed on a floor with a suitable load capacity. If the existing building does not fulfil this requirement
appropriate measures (e.g. load distribution plate) must be taken.
The minimum safety distance from flammable materials must be at least 200 mm from the sides and back of the
appliance, 800 mm from the front and 750 mm from the upper part.
The installation must guarantee easy access for cleaning the appliance, the flue gas exhaust pipes and the flue, and any
subsequent maintenance operation by the Authorised technical assistance centre.
Once you have found the best location for the appliance, position it following the instructions given below.
The appliance must not be installed in small rooms, bedrooms, bathrooms or in areas with an explosive atmosphere
(e.g. garages).
Spaces around and above the appliance
The figure below shows the minimum distances from walls or other not-easily-removable furniture, that need to be taken
into consideration when positioning the appliance.
Any shelves or false ceilings mounted above the appliance must be at least 75 cm away from the top part of it.
Furniture and movable objects made from flammable materials must be positioned at least 20 cm from the side surfaces
of the appliance; these objects must be moved when performing maintenance on the appliance.
Protect all structures that can catch fire against the radiated heat of the fire.
Any extra intervention by the Authorised technical assistance centre, which requires the appliance to be
disconnected from the system, will not be covered under warranty as described in the chapter “Standard
Warranty Conditions”.
External air intake
During operation, the appliance takes in air from the environment in which it is installed; It is therefore essential that this
air is replaced through an external air vent. The absence of the air vent may affect the flue draught and therefore the
combustion and the safety of the appliance.
Therefore it is mandatory to install an external air vent with a minimum completely free passage of at least 80 cm2
(round hole with minimum diameter of 15 cm protected with a special fixed large mesh grille).
If it not possible to put the external air vent in the same room as where the appliance is installed, this hole can be made
in an adjoining room as long as this room communicates permanently, by means of a transit hole (15 cm minimum
diameter).
The hole must be protected externally with a fixed grille. The protective grille must be checked periodically to ensure that
it is not obstructed, thereby impeding the passage of air. Therefore keep the air vents clear of obstructions.
The UNI 10683 Standard FORBIDS the drawing of combustion air from garages, warehouses storing combustible
materials, or from business premises with a fire hazard.
REAR WALL
SIDE WALL
SIDE WALL

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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If there are other heating or extraction devices inside the room, the air vents must guarantee a sufficient amount of air for
properly operating all the devices.
Only sealed appliances (e.g. C type gas appliances, according to the UNI 7129 Standard) or appliances that do not
cause a lower pressure compared with the external environment can pre-exist or be installed in the place where the
appliance is installed.
Extractor fans can cause malfunctions to the appliance if used in the same room.
The flue and connection to the same
The flue is an essential element for the efficient operation of the appliance. The flue must have the minimum cross-
sectional dimensions stated in the appliance’s technical specifications (80 mm). Each product must be equipped with its
own flue, without other adjoining elements (boilers, chimneys, stoves, etc.). The flue dimensions are closely related to its
height, which must be measured from the appliance flue gas outlet to the base of the stack. In order to guarantee
adequate draught, the surface of the chimney flue outlet must be double the flue cross-section. The discharge pipe for
combustion products generated by the forced draught device, must comply with the following requirements:
-It must seal off the combustion gases, as well as being waterproof and suitably isolated and insulated in relation to
the conditions of use (refer to UNI 9615);
-It must be made of suitable materials capable of withstanding normal mechanical stress, heat, and the effects of
combustion gases and condensate, if any;
-It must go upwards after the vertical section, for the entire remaining part, with a minimum gradient of 5%. The sub-
horizontal section must not have a length greater than ¼ of the effective height H of the flue or chimney, and must
not be longer than 2,000 mm;
-It must preferably have a round internal cross-section: square or rectangular cross-sections must have rounded
corners with radius not inferior to 20 mm;
-It must have a constant, free and independent internal cross section;
-Rectangular cross-sections must have a maximum ratio of 1.5 between the sides;
-It must be insulated to prevent the fumes from cooling and forming condensation;
-Parts made from non-combustible materials (it is absolutely prohibited the use of aluminium flue) - capable of
withstanding combustion gases and potential condensation - must be used for mounting the flue gas pipes (for the
section from the appliance to the flue inlet);
-It is forbidden to use fibre cement pipes to connect the appliance to the flue;
-Flue gas conduits must not pass through rooms in which the installation of combustion devices is prohibited;
-The flue gas conduits must be assembled in such a way as to guarantee adequate sealing of flue gases during low
pressure operation of the appliance;
-The installation of horizontal sections is prohibited;
-It is prohibited to use counter sloping elements;
-The flue gas pipe must allow for the recovery of soot or be cleanable, and must have a constant cross-section;

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
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-It is forbidden to allow other air intake conduits and system pipes to transit inside the flue gas pipes, even if they are
over-sized.
FURTHER SPECIFICATIONS TO BE CONSIDERED
-The appliance works with the combustion chamber in depression and the flue pipe in pressure; it is essential that
the flue gas outlet is hermetically sealed.
-The flue pipes inside the installation room must be made of a suitable material (see applicable regulations) and
equipped with sealing gaskets with a minimum diameter of 80 mm.
-The pipes must have a double wall (thermally insulated) or be suitably insulated with rock wool. The
maximum temperature of the flue pipe inside the room must not exceed 70°C.
-IT IS MANDATORY TO HAVE AN INITIAL VERTICAL SECTION OF AT LEAST 0.5 M IN ORDER TO
GUARANTEE CORRECT FLUE GAS DISCHARGE.
-Every direction change must be carried out with a T-shaped fitting and inspection cap. The tubes must be smoketight
thanks to special seals capable of withstanding temperatures of up to 250°C. Attach the pipes to the wall with special
collars to prevent any vibration.
-IT IS STRICTLY FORBIDDEN TO INSTALL DRAUGHT REGULATION VALVES (BUTTERFLY VALVES).
If the flue is old or too large (internal diameter greater than 15 cm), it must be ducted using a stainless steel pipe that is
suitably insulated (with rock wool or vermiculite) and sized according to the route. The connection to the flue must be
appropriately sealed.
When assembling the flue, there must be no more than 4 direction changes.
Chimney
The chimney is a device crowning the flue, used to ease dispersion of combustion products.
It must satisfy the following requirements:
-It must have a usable outlet cross-section no less than double that of the flue onto which it is inserted;
-It must be shaped in such a way as to prevent rainwater or snow from entering the flue;
-It must be built in such a way as to ensure the discharge of combustion by-products even in the event of winds from
every direction and inclination.
INSPECTION HOLE
80 mm
MINIMUM 1.5 m
100 mm
INSPECTION
HOLE
INSPECTION
MAX 500 mm

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
16
EN - Rev. 1.1
The outlet height (where height refers to the top of the flue, regardless of any chimney stacks) must be outside of the so-
called reflux zone, in order to prevent the formation of counter-pressures preventing the free discharge of combustion
by-products into the atmosphere.
It is therefore necessary that the minimum heights - indicated in the following diagrams - are observed:
ELECTRICAL CONNECTION
The electric connection must only be performed by qualified staff, in compliance with all general and local safety
standards.
Check that the power supply voltage and frequency correspond to 230V –50 Hz.
The appliance's safety is ensured when it is properly connected to an efficient earthing system.
In the electric connection to the mains power supply, include a 6 A –Id 30 mA differential trip-switch with suitable
breaking load. The electric connections, including the earth connection, must be made after shutting off the electrical
system.
When completing the system, bear in mind that the cables must be laid in an unmovable manner and far from parts
subject to high temperatures. During the final wiring of the circuit, only use components with a suitable electrical
protection rating. Do not pass electric cables in the immediate vicinity of the flue gas pipe, unless they are insulated with
suitable materials.
KLOVER srl declines all responsibility for injury to persons and animals or damage to objects due to failure to
connect the appliance to earth or to comply with IEC specifications.
Control of any coupled boiler
If the pellet appliance is to be coupled with a previously installed boiler in the system (e.g. wall-hung gas boiler), you
must ensure that the standard boiler stops when the pellet appliance takes over the heating of the system. The electrical
setting, which is accessible from the right-hand inner part of the appliance,intervenes on the standard boiler when the
heating circulating pump of the pellet appliance starts up so as to avoid having two boilers operating simultaneously on
the same system. The coupled boiler is however always available for the production of domestic hot water.
The two wires fitted on the left-hand technical compartment of the appliance (blue and brown wires) will have an
output voltage of 230 V when the pellet appliance pump is working, and no voltage when the pump stops.
It is therefore necessary to connect the 2 wires to a relay that will control the Room Thermostat (R.T.) input of the
coupled boiler (see the following example).
Distance > 5 m
Distance < 5m
Distance >1.85 m
Distance < 1.85 m
0.5 m
Technical
volume
0.5 m
1 m minimum
Reflux zone
15°

PELLET BOILER STOVE THERMOAURA, THERMOCLASS, CLASS HYDRA, STYLE 120 PLUS
17
EN - Rev. 1.1
Control of a possible three-way motorized valve for DHW system management
The pellet appliance is equipped as standard with a control for a possible 3-way motorised valve to be installed on the
domestic water circuit based on the selected system type (see “System configuration”). In the right-hand inner part of the
appliance there are four wires with fastons protected by a red seal, which can be used for controlling the valve (see also
“Wiring diagram”). The four wires have different colours, and precisely:
-Blue wire = 3-WAY VALVE COMMON (Neutral 230 V)
-Black wire = SANITARY SIDE (Phase 230 V with DHW demand)
-Black wire = HEATING SIDE (Phase 230 V with no DHW demand)
-Yellow/green wire = GND
Connection to the room thermostat
Behind the appliance there is a bridged terminal which is used to connect the room thermostat that will command the
operation. The operation of the room thermostat is enabled with system types 1, 2 and 3 (see“System configuration”).
OPERATING PRINCIPLE
Open contact:
-The appliance switches directly to economy mode operation “T-AMB
ECONOMY” thus minimising its operating power.
-The heating circulating pump of the appliance switches off.
-The appliance is switched off with a delay of 60 seconds.
The appliance will switch on again automatically if all of the following
conditions occur:
-The contact of the room thermostat closes.
-If it goes below the temperature differential (SET H2O –Pr43).
Once any cooling cycles are complete.
N.B.: If the water temperature exceeds the set threshold of 80°C (safety temperature), the circulating pump of the
system is forcedly switched-on to ensure the disposal of excessive heat, thus avoiding high water temperatures in the
boiler. For this reason it is recommended that the heating system is not entirely closed.
In the configuration “System type 3”, the appliance switches to economy mode and then switches off only if the “SET
BOILER” temperature setting has been reached.
ATTENTION: In the event that the room sensor in the “Remote control” for the appliance is enabled, the appliance
switches to economy mode if the “SET ROOM” temperature setting has also been reached.
CN16
PUMP
BROWN
COUPLED
BOILER
R.T.
CONTACT
RELAY
BLUE