BIO 30, BIO 50, BIO 95

Transcription

1 BIO 30, BIO 50, BIO 95 STEEL BOILER FOR HEATING WITH BURNER AND AUTOMATIC FUEL FEEDER BIO kw POWER USER MANUAL, USER GUIDE, INSTALLATION, USE AND MAINTENANCE OF THE BOILER

2 1. Introduction Biokaitra company thanks you and congratulates for purchasing the heating unit. Your multi-functional boiler is fired with straw and wood pellets (firewood, briquettes can be used as spare or additional fuel. In such case, please purchase a special grille as an option). Using a modern design and latest steel processing developments in our manufacturing processes, we created a cost efficient heat source for your home, business and commercial applications with an area of 500 m2. In designing the Bio series boilers, we were focused on satisfying your needs, relying on our many years of observations and feedback from consumers. As a result we created an easy-to-use unit with the efficiency exceeding 85%. Recommendations. Initial actions - Check the unit and completeness - Carefully read the instructions for safe use - Read the chapter of boiler installation before installing the boiler. NOTES!!! - Protect the boiler and its components against mechanical damage during transportation. - Store the boiler in a dry place before installation. - Connect the boiler to the mains, the water supply system and the chimney in accordance with the applicable rules, requirements and the instructions for use. - The manufacturer does not assume responsibility for any loss or damage resulting from improper installation of the unit. - Immediately consult the authorized service centre in case of emergency. - Persons without sufficient qualifications tampering with the device may cause damage to the boiler. - Only use original replacement parts for repairs. The boiler and the hopper housing is covered by the three year warranty. The annual inspection of the boiler must be carried out every year and recorded in the warranty sheet. Moving parts and consumables are covered with one-year guarantee. They include: helical loader (auger loader), gear reduces and motor, fan, controls and insulating rope. - The warranty sheet and the warranty terms are attached to these instructions. Applications of the boiler with the burner - Bio fuel boilers with automatic fuel loader and the burner are designed for burning straw and wood pellets of 6-10 mm in diameter. - Bio boilers are modern hot water boilers with kw nominal power for generating heat and producing hot water for domestic applications (volumetric domestic water heaters boilers) and used in heating of residential and industrial buildings. - Bio boilers are equipped with an automatic fuel helical loader (auger loader), a burner and a fuel tank with a capacity of fuel sufficient for several days (3-5 days). The fuel auger loader, the fan and the circulating pump are controlled by modern automation controllers. The boiler control system allows you to program the combustion process depending on operating conditions, weather and fuel quality. - The Bio boiler has an option for installing cast iron fire grate (special grille) for burning wood and other solid fuel in a traditional way. - Bio boilers do not require constant ignition, because fuel is dispensed by the automatic helical loader (auger loader).

3 Suitable fuel Main fuel Straw pellets/wood chip pellets Minimum and maximum diameter of straw pellets is 6-10 mm, length diameter x4. Calorific value: MJ Maximum moisture content of straw pellets and wood chips up to 12% Ash content: straw pellets up to 6%, wood pellet chips up to 1.5% Dust content: up to 2% of the fuel mass Alternate fuels using fire grate (optional) Fuel wood Wood shaving briquettes Straw briquettes ATTENTION! The boiler can only be used in a heating system with an expansion vessel. Boiler performance 1. Boiler design Bio boiler is made of high quality certified steel sheets. The housing is made of galvanized steel powder coated with paint. 2. Structure All boilers of Bio series manufactured by Biokaitra consist of two separate active components. The lower part of the housing contains a furnace chamber, and the upper part of the housing contains heat exchanger with water partitions, progressing into the chimney. Three doors are installed in the front part of the boiler: the upper for visual inspection of the heat exchanger and cleaning the heat exchanger, the middle for visual inspection of the burner and flame and for the burner cleaning, and the bottom for ash disposal. 3. Combustion Combustion in the Bio boilers takes place in the burner, to which the fuel is supplied by a helical loader (auger loader) that connects the fuel tank with the burner. Fuel is loaded via the tank hatch with a latch (CAUTION: always keep the tank tightly closed during the boiler operation). Fuel is supplied to the burner under the auger loader driven by an electric motor connected to the gear reducers. In the burner, fuel is pushed to the top, where it forms a mound. Combustion takes place in the upper part of the burner, using the air blown by the fan. Air enters the burner channels on the hot straw or wood pellets, and the combustion begins. The ash from the burner gravitates to the ash bin in the bottom of the combustion chamber of the boiler. 4. Water supply Water in supplied to the boiler through the external threaded connections G 1 ½", water is force-drained along the ½" nipple in the lower rear part of the boiler.

4 5. Flue The flue nipple (158 mm for Bio30, 200 mm for Bio50 and 250 mm for Bio95 kw) is installed in the upper part of the boiler over the heat exchanger. 6. Protection from overheating If the boiler temperature reaches 95 C, the emergency thermostat is activated, the fuel supply and the air fan are shut off, and the audible alarm sounds. The emergency thermostat is unlocked manually by unscrewing the cap and pressing the button under the cover. Unlocking is possible when the water temperature in the boiler drops below 60 C. After unlocking the emergency thermostat the alarm sound goes off. Upon igniting the boiler again, it is necessary to identify the cause of the emergency activation of the thermostat, by monitoring the unit operation. Bio boiler profile

5 Burner section 1. Burner ( degiklis ) 2. Auger ( sraigtinis transporteris) 3. Burner s housing ( degiklio korpusas) 4. Fan ( ventiliatorius) 5. Electromotor ( elektros variklis). Components of the set : boiler housing, fuel tank, fuel transporter with burner, gear reducers and electric motor, fan, boiler controller (automated), emergency thermostat, boiler passport, user instruction manual and warranty cards. Boiler installation: - Boiler installation must be carried out by authorized, qualified persons. - It is necessary to draw up a project of the boiler station for the boiler installation in accordance with applicable laws and requirements of the Republic of Lithuania. - The boiler must be installed in accordance with applicable requirements. The manufacturer does not assume responsibility for direct and indirect loss or damage resulting from improper installation of the boiler. Choosing the boiler capacity: - Proper choice of the boiler size, i.e. its thermal power determines the cost efficiency and operational effectiveness of the boiler. - The boiler must be chosen so that its heating power matches the heat loss in the object.

6 Place for boiler installation: - The boiler must be installed in a location where the conditions meet applicable requirements. - Minimum distance of the boiler circuits from the walls must be 200 mm. Maintain a safe distance from flammable materials, electricity and gas network. - It is recommended to install the boiler built on the foundation of non-combustible materials, which is 100 mm wider than the boiler perimeter and 300 mm wider at the front of the boiler. The foundation height should be about 100 mm. ATTENTION! The boiler room must be equipped with gravitational ventilation. Fresh air must be supplied to the boiler room in the volumes that correspond to the specific boiler air consumption, depending on its capacity. This is necessary for proper operation and safety of the boiler. Boiler installation - The boiler can be installed only in the rooms were the conditions meet the requirements for boiler stations. - Supply and return water connections have an external thread G 1 ½". - Heating network power supply must be connected to the outlet at the top of the boiler housing. Water recovery from the network must be connected to the outlet in the bottom rear part of the boiler housing. - the system must be equipped with a safety valve (diameter ½), which prevents the excessive working pressure maintaining it below 0.2 MPa (2.0 kgf/cm2) in the heating system. The valve operation must be checked periodically, by turning the valve handle. The safety valve must be fitted on the incoming hot water piping. Location for the safety valve installation (example): Safety valve ( Apsauginis voztuvas), Feed in hot water from the boiler ( paduodamas karštas vanduo iš katilo).

7 Heating - In order to prolong the lifetime of the Bio boiler we recommend to maintain at least 65 C temperature in the boiler. - Temperature of media returning to the boiler must be no lower than 60 C to prevent condensation and pouring of resins in combustion chamber. This will extend the boiler service life and improve its performance. - For the control of supply and return temperature we recommend a manual four-way mixing valve with actuator. - To achieve the best cost-effectiveness, it is recommended to use the mixing valve also in the heating system. - It is best to use clean soft water as heat transfer medium, filtering it with special filters for water preparation. - The maximum permissible water column height may not exceed 20 m. Connecting to the flue - Boilers in the central heating system must be connected to a separate flue channel. - Connection to the flue must be performed by a suitably qualified person in accordance with applicable requirements. - The flue cross-section must be selected according to the capacity of the boiler. This ensures efficient and cost-effective operation of the boiler. - We recommend to install a damper in the flue installed to improve the draught. Installation of boiler with equipment The boiler is delivered in separate parts i.e., the boiler, the fuel transporter with burner, gear reducers and electric engine, fuel tank, fan, boiler control automation and emergency thermostat. Boiler assembly procedure: - The fuel loader frame with the burner is inserted inside the boiler and bolted on the boiler housing (the place of connecting the fuel loader housing flange to the boiler housing must be sealed. Sealing is best done at high temperature resistant silicone). - The fuel tank is positioned and mounted on the outside of the fuel loader housing flange (gasket is placed between the flanges; we also recommend sealing with temperature resistant silicone). - Connect the boiler control automation with emergency thermostat (the capillary of the emergency thermostat is put into the shell on the back of the boiler). ATTENTION! CAUTIONS! Boiler automation installation must be carried out by authorized, qualified technicians. Detailed information of the automation software settings is provided in Section 2 of this manual ( Boiler automation equipment connection and settings ). The main setting parameters include the duration of fuel feeding operation and breaks, which determines the amount of fuel supplied and the boiler power, and also the fan power which is set up to achieve optimum combustion. Connection to the power supply network Two electrical outlets with a ground connection should be available in the boiler installation area for correct connection of the boiler. Fan, automation equipment and feeder engine and all electrical equipment of the boiler must be connected to the mains, corresponding to the applicable requirements. Electrical outlets with a ground connection must be mounted in such a distance from

8 the boiler, so that it is possible to immediately disconnect the boiler from the mains where necessary. Main boiler dimensions and technical specifications Boiler model BIO 30 BIO 50 BIO 95 Type of boiler Automatic central heating boiler Automatic central heating boiler Automatic central heating boiler Heating efficiency range, kw 30-Aug Nominal heat output, kw (when stoking with pellets with a calorific value of 4.2 kwh / kg) Efficiency ratio at nominal output, % Temperature of exhausted flue gas, C Heating capacity, m Fuel to be used straw, wood and other agropellets: 6-10mm straw, wood and other agropellets Manual loading of fuel: firewood, straw and wood briquettes. straw, wood and other agropellets: 6-10mm straw, wood and other agro-pellets Manual loading of fuel: firewood, straw and wood briquettes. straw, wood and other agropellets: 6-10mm straw, wood and other agropellets Flue gas chimney connection, mm ø 160 ø 200 ø 250 Fuel consumption, kg/h (Qmin Qn), when stoking with pellets with a calorific value of 4.2 kwh / kg Maximum allowed working pressure in the boiler 2 bar 2 bar 2 bar Water contents in the boiler, l Minimum return water temperature during boiler operation, C Maximum allowable operating temperature, C E. power, 230V / 50Hz maximum, W Minimum draft in the combustion chamber, Pa Combustion chamber volume (length x width x depth) for optional fuel, mm 500 x 350 x x 450 x Overall dimensions with fuel tank, mm Height Width Depth Capacity of fuel tank, l. Weight of the boiler, kg

9 I. Description of the device ST-560 controller is used for boilers fired with CH pellets with a feeder and ventilator. Due to the advantageous software, the controller performs many diverse functions: Controls the burner Controls the feeder Controls air supply ventilator Controls central heating pump CH Smoothly controls the mixing valve Controls two additional valves (optionally by using additional module) Adjusts DHW pump Adjusts additional pump (additional pump: CH, DHW, circulator pump or base pump) Floor heating Weekly control Interaction of two operation status regulators as well as controller that ensures RS communication. Possibility to connect ST-65 GSM module allowing the user to adjust certain functions of the controller by mobile phone Possibility to connect ST-505 Ethernet module allowing the user to monitor and regulate certain controller functions by internet Possibility to connect two additional control modules (e.g.: ST-61 or ST-431N) it helps to adjust two additional valves. II. Installation The controller must be installed by a qualified specialist. WARNING The risk of electric shock in case of touching the powered connections. Before working with a controller, make sure to disconnect the power supply and avoid its disconnection. III. How to use the controller? Phases of use The user shall configure special CH boiler operation phases. Ignition and extinguishing the multi-stage process as described below. In case of proper ignition process, the controller is set at the operating or modulation mode subject to the usage algorithm chosen by the user Fitter s menu / Operation algorithm select. Ignition The ignition procedure may be different subject to the chosen operation algorithm. This stage is activated by the user in the main menu. In case of selection of the ignition function, the following message is shown on the monitor: Is there sufficient fuel on the grating?. The user confirms by moving to a next stage. In case of lack of fuel, the monitor shows the command to fill the fuel manually in order to activate the feeder. During the next stage, the controller turns on the heater and the fan they remain turned on until the increase in the temperature of flue gas. Then they move to the next stage deferral of ignition when the heater is turned off and the fan functions for a pre-determined period of time (default parameter: 20 min.). Next, the controller is set to the operation mode. If the controller cannot determine that flue gases increased after 10 min., the heater is turned off and the fan functions for 5 min. only. It is then possible to perform the next test - the heater was active on for 10 min.

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11 The fan operates for 5 min. The controller will try to ignite the boiler 3 times. In case of failure to start the boiler in all attempts (the controller does not determine the flue gas temperature increase), the monitor shows the report of failure to ignite. Algorithm of the entire modulation operation In case of successful ignition, the controller is set to the modulation mode. It consists of five stages subject to the operating temperature. The following modulation stages are set one after another: 100%, 80%, 60%, 40% and 30% (the user sets the specific parameters). The transfer from one stage to another is related to CH boiler temperature difference and predetermined value as stipulated below: A- Pre-set temperature interval 100% B- Pre-set temperature interval 80% C- Pre-set temperature interval 60% D- Pre-set temperature interval 40% When the pre-set temperature is reached, the controller functions according to the 30% modulation of the stopping mode parameter. The user defines the operation duration, the feeder activation frequency and the blowing force for the specific modulation stage ( Modulation settings main menu). In case of selection of 100%, 80%, 60% and 40% modulation, the user also configures Range form set temp.. The parameter used to define the value when the controller moves to another modulation stage. For example: Pre-set CH boiler temperature: 60⁰C; temperature setting interval 100%: 30⁰C; temperature setting interval 80%: 25⁰C; temperature setting interval 60%: 15⁰C; temperature setting interval 40%: 10⁰C Result: in case of successful ignition of boiler, the controller moves to the next modulation stages, when the CH boiler temperature increases: CH boiler temperature 30⁰C transfer to 80% stage CH boiler temperature 35⁰C transfer to 60% stage CH boiler temperature 45⁰C transfer to 40% stage CH boiler temperature 50⁰C transfer to 30% stage

12 When the pre-set temperature is reached, the controller functions according to the 30% modulation of the stopping mode parameter. Operation algorithm modulation 100%, 80%, 60%, 40%, 30% If the user selects specific CH boiler usage modulation parameters in the menu, the CH boiler operates according to the parameters of the set modulation stage (feeding time, feeding pause, blowing force) and in case of achievement of the pre-set temperature, according to the parameters of each modulation stage (support mode, number of cycles on the support mode, fan support mode). Extinguishing Extinguishing procedure does not depend on the selected functioning algorithm. This stage is activated by the user in the controller s main menu. When the extinguishing is activated, the heater and the fan are deactivated. IV. Controller s functions Main Menu Due to various functions performed by the controller, the menu is classified into the main menu and maintenance menu. The main menu provides the basic options such as operation parameters, weekly control parameters, etc. Main menu flow chart Main menu Ignition Filled fuel tank Temperature parameters Pre-set CH boiler temperature: CH boiler hysteresis Pre-set DHW temperature DHW hysteresis Pump starting temperature Manual ignition Modulation settings Modulation 30% Modulation 40% Modulation 60% Modulation 80% Modulation 100% Selection of fuel Straw pellets 1 Straw pellets 2 Wood pellets Manual mode Burner Blower Blower force Feeder CH pump DHW pump Auxiliary contact Installed valve 1 Installed valve 2 Weekly control Weekly control of CH boiler Weekly control of DHW boiler Operation modes

13 Domestic heating Water tank priority Parallel pumps Summer mode Floor heating Disinfection Screen settings Screen view Screen brightness Screen blinking Blinking time Software updates Metalworker s menu Maintenance menu Language Software version Factory settings V.a) Ignition The selection of this option starts the ignition process. Other stages are described in Section IV. V.b) Filled fuel tank This function is applied when the fuel tank is fully filled to restore 100% fuel consumption percentage (the value is shown on the right corner of the main screen below the stopwatch). NOTE. Before using this function for the first time, it is necessary to calibrate the fuel feeder Fitter s menu/calibration V.c) Temperature parameters Press the Temperature settings icon to pre-set CH boiler and DHW tank temperature and hysteresis. V.c.1) Pre-set CH boiler temperature: This option is used to pre-set CH boiler temperature. The setting interval reaches 65 O C to 80 O C (factory setting CH boiler manufacturer can change the settings interval). V.c.2) CH boiler hysteresis This option is used to set the pre-determined CH temperature hysteresis. It is a difference of temperatures of support mode entry and restoration maintenance mode (e.g. when the pre-determined temperature reaches 65ºC, hysteresis 3ºC, because the support mode is entered under 60 o C temperature when the operation mode return procedure is performed under 62ºC). V.c.3) Pre-set DHW temperature This function is used to pre-set water temperature. When the water in DHW tank reaches the pre-set temperature, the controller disconnects the DHW pump. It is activated when the temperature drops below the pre-set DHW hysteresis value (DHW sensor reading). V.c.4) DHW hysteresis This option is used to set the hysteresis of pre-set water tank temperature. It is a maximum difference between the pre-set temperature (desired DHW tank temperature) and operation restoration temperature.

14 E. g.: if the pre-set temperature reaches 55 C and the hysteresis value is 5 C, DHW pump is deactivated, when the pre-set temperature of 55 o C is reached and activated again when the temperature drops down to 50 o C. V.c.5) Pump starting temperature This option is used to define CH pump and DHW pump starting temperature (the temperature is measured in the CH boiler). When the temperature is lower, both pumps are inactive, when this temperature is higher, the pumps are turned on and operate according to the selected operation mode (see Pump operation mode). V.d) Manual ignition This function should be activated when CH boiler is used without fuel feed. When this mode is set, the feeder is deactivated and ventilator operates according to the parameters set in the maintenance menu. This function is planned for the firewood mode for 30kW and 50kW boilers. V.e) Modulation settings Press this icon to configure the CH boiler operation parameters of specific modulation stage. The parameters should be configured at the same stage (except for Range from set temp. parameter which is not applied when the modulation reaches 30%). V.e.1) Feeding time This parameter defines the feeder operation time having selected the specific modulation stage. V.e.2) Temporary suspension of feed This parameter defines the duration of temporary stopping of feeder when a specific modulation stage is performed. V.e.3) Blower force This parameter defines the force of the fan at the specific modulation stage. V.e.5) Pre-set temperature interval Note This parameter does not apply in case of 30% modulation. This parameter defines the time of passing to the next modulation stage (applied for CH boiler operation according to the entire modulation algorithm). When CH boiler temperature reaches the pre-set value minus the pre-set temperature interval value, the controller switches to the next modulation stage. V.e.6) Support mode This parameter defines the feeder operation time on the support mode (i.e. when the pre-set temperature was reached). V.e.7) Number of support mode cycles This parameter defines the feeder actuation mode on the support mode. It is connected when the pre-set number of fan operation cycles is reached. The number of cycles is set by the user. V.e.8) Fan support mode This auxiliary mode is used to set the operating parameters of the fan on the support mode: duration of operation, duration of temporary stopping and blowing power.

15 V.f) Selection of fuel This option is used to select one of the following types of fuel: straw pellets 1, straw pellets 2 or wood pellets. V.g) Manual mode The manual mode function is planned in the controller for more convenient operation of the device. Irrespective of other devices, this function can be used to activate and deactivate each operated device. It is easy to check if the device functions properly, i.e. burner, feeder, air blower (fan), CH pump, DHW pump, additional contact and valves (valves can be opened or closed manually). Furthermore, the user can regulate the speed of ventilator on the manual operation mode by using blow force function. V.h) Weekly control This function allows the user to program the weekly CH boiler operation schedule and to define the pre-set changes of CH boiler and DHW temperature. The controller can be used to set three weekly control modes. V.h.1) Weekly control of CH boiler Weekly control function allows the user to program the pre-set CH boiler temperature changes on specific hours and days of the week. In order to activate this function, please select Mode 1 or Mode 2. Detailed settings of each mode are available in the auxiliary menu: Set mode 1 and Set mode 2. Having selected the necessary mode, in the main screen you will see the operating temperature deviation value (below the pre-set CH temperature, contrary than with the advance setting button), which shows to the user that this function has been activated. How to change the weekly control settings? ST-560 controller allows the user to program the weekly control function on two modes: MODE 1 the user sets temperature deviations for all days of the week individually; MODE 2 the user sets temperature deviations for all business days (Monday - Friday) and for weekends (Saturday and Sunday) individually. How to configure mode 1? In order to configure mode 1, please select Set mode 1 the monitor shows the point of the specific days of the week. When the specific day of the week is selected, the screen shows the editing post - the upper row shows the current deviation, the bottom row shows the time-period. Please use and to change the time-period. In order to edit the value of deviation, use and. In order to copy the parameter of the other time-period, please use. When the temperature changes for the prepared specific day, please press CONFIRM icon the screen will show the screen allowing to copy the settings on other days. For example: Monday Set: 300, temp. -100C (weekly control parameter 100C) setting: 400, temp. -100C (weekly control parameter 100C) setting: 500, temp. -100C (weekly control parameter 100C) In this case, if the advance CH boiler setting temperature is 600C, from 300 to 600

16 On Monday, the pre-set temperature drops down to 100C, for the temperature to reach 50 0 C. How to configure mode 2? In order to configure mode 2, please select Set mode 2 the monitor shows the desk of two-days group Monday - Friday and Saturday - Sunday. Please choose the group you want to edit and follow the same procedure as shown in Mode 1. For example: Monday- Friday Set: 300, temp. -100C (weekly control parameter 100C) setting: 400, temp. -100C (weekly control parameter 100C) setting: 500, temp. -100C (weekly control parameter 100C) Saturday-Sunday Set: 400, temp. 50C (weekly control parameter +50C) setting: 500, temp. 50C (weekly control parameter +50C) setting: 600, temp. 50C (weekly control parameter +50C) In such case, if the advance CH boiler setting temperature is 600C on each day of the week (Monday-Friday) from 300 to 600, the pre-set temperature drops by 100C, when the temperature reaches 500C. On the weekend from 400 to 700, the pre-set CH boiler temperature increases by 50C, therefore, the temperature reaches 650C. Note For proper operation of the weekly control, it is necessary set the current time and day of the week in technical maintenance menu >> Time settings. Remove This function allows the user to eliminate all weekly control settings. V.h.2) Weekly control of DHW boiler This function allows the user to program everyday DHW temperature changes. Temperature deviation setting interval +/-10⁰C. In order to configure DHW weekly control settings, please follow the steps indicated in CH boiler weekly control manuals. V.i) Operation modes The user can select one of the following modes: V.i.1) Domestic heating When this function is selected, only the house is heated. CH pump is activated when the temperature exceeds the pump activation threshold. In case of lower temperature, (minus 2 o C hysteresis), the pump is disconnected. V.i.2) Water tank priority By this mode, the water tank (DHW) pump is activated first and then it functions until the pre-set DHW temperature is reached (the valve is closed in case of achievement of the maximum temperature and valve pumps are disconnected). (Together with pumps - according to their settings). The valves are functioning continuously until the temperature of the water tank drops below the pre-set value minus hysteresis. Then the valve pumps are disconnected and the DHW pump is connected.

17 V.i.3) Parallel pumps According to this mode, all connected pumps and valves are functioning at the same time. The valves support the pre-set temperature and the water tank is heated until the pre-set temperature. V.i.4) Summer mode When this mode is connected, CH valves are closed to prevent from additional heating of home. If the CH boiler temperature is too high, the valve is opened at emergency mode (it is necessary to activate the reverse protection!). When this mode is set, the water tank pump and base valves function according to the settings. V.i.5) Floor heating This function is used to disconnect the control of underfloor heating system. When this option is rejected, the control function closes all the valves attributed to this underground type (see valve parameters technical maintenance menu). The default settings function is activated. V.i) Thermal disinfection Thermal disinfection covers DHW and can be activated only in the Water tank priority mode or Parallel pump mode. During this disinfection the water temperature in DHW chain reaches min. 60 C (necessary disinfection temperature). It is necessary to set DHW device when the thermal disinfection would be performed at least at 60 C (recommended temperature: 70 C). Piping, reinforcement and technological DHW system design should meet the requirements. DHW disinfection is aimed at removing Legionella pneumophila - bacteria that weakens the immunity system. Such bacteria usually proliferates in hot water tanks (optimum temperature: 35 C), it usually happens in water tanks. When this function is activated, the water boiler is heated until the pre-set temperature is reached. The temperature is maintained throughout the entire disinfection time (e.g. 10 min.). The standard operation mode is restored. Disinfection temperature should be reached within 60 min. from the start of activation (default parameter). Otherwise, this function would be automatically disconnected. Any changes of this system could be entered only at the time of technical maintenance. V.j) Screen settings The main screen settings can be adjusted according to the needs of the user. V.j.1) Screen view The user can change the main screen view by choosing the desk to show the current controller parameters. V.j.2) Screen brightness This function is used to adjust the brightness of the screen in % interval. V.j.3) Screen blinking This function can be used to regulate the brightness of empty screen in 0 50% interval. V.j.4) Suppression time This function allows the user to set the screen suppression time. V.k) Adjustment menu All settings in the adjustment menu are described in detail in the sections of this manual.

18 V.l) Maintenance menu Access to the technical maintenance menu is restricted to the qualified personnel, therefore, it is protected with a security code that can be provided by the technical maintenance company. V.m) Language This function is used to select language. V.n) Software version This function provides access to the controller s software data. V.o) Factory settings This function allows the user to restore factory settings saved by the manufacturer. V. Controller functions - Adjustment menu Adjustment menu can be accessed by qualified personnel only. It is used to adjust the additional controller functions such as CH boiler parameters, additional valves, additional pumps, etc. It also permits the user to achieve expanded settings of basic functions (e.g. Parameters of installed valves). Below is the simplified adjustment menu block diagram. Adjustment menu Operational algorithm option Full modulation Modulation 30% Modulation 40% Modulation 60% Modulation 80% Modulation 100% Buffer parameters Buffer OFF ON Pre-set temperature top Pre-set temperature bottom DHW function From the buffer From CH boiler Valve settings Installed valve 1 Installed valve 2 Valve 1 Valve 2 Auxiliary contact Device type CH pump DHW pump Circulator pump Floor pump Room regulator TECH RS regulator Standard regulator 1 Standard regulator 2 CH pump station regulator Time settings Clock settings

19 Date settings Fuel level calibration Full tank Empty tank External temperature correction Correction values Average GSM module ON OFF Ethernet module ON OFF DHCP IP address IP mask Lock address DNS address Module version Restore module password Factory settings VI.a) Operational algorithm option This function allows to choose the controller operation algorithm: full modulation or one of modulation stages. Controller operation on each mode is described in detail in Section IV. VI.b) Buffer parameters These parameters are used to regulate controller s operation in the heating system with a buffer. Buffer When the buffer is activated (ON is selected) in the controller s menu, CH pump is used as amortisation equipment with two sensors: top (C1) and bottom (C2). The pump remains connected until the pre-set temperature bottom of the buffer is reached. When the temperature drops below the pre-set temperature top, the pump is activated once again. Pre-set temperature top This function allows the user to set the pre-set buffer temperature top. When this value is reached, the pump is disconnected (provided that pre-set buffer temperature bottom was reached. Pre-set temperature bottom This function allows the user to set pre-set buffer temperature bottom. DHW function If a buffer is installed in the heating system, it is necessary to indicated how to connect the water tank: - From CH boiler - heating system where DHW tank is connected directly to CH boiler (separate chain). - From buffer - heating system where the DHW tank is fitted to or connected to the buffer.

20 VI.c) Valve settings The module fitted in ST-560 controller regulating the mixing valve. For control valves (e.g. ST-431N), it is possible to connect two additional modules. The interval of parameters allows the user to adjust the performance of the valve according to the individual needs. When a specific valve is activated, the monitor shows additional menu where it is possible to configure valve parameters. The parameters of both installed valves and additional valve are similar as provided in the flowcharts: Installed valve ON Valve disconnected Pre-set valve temperature Opening time Type of valve CH floor Room regulator Control without room regulator RS regulator - reduction RS regulator - proportional Standard regulator Room reg. temperature is lower Room regulator CH pump Valve closing Air basis control Valve pump Always turned on Always turned off Turned on above the threshold valve Turn on the temperature Reverse flow protection ON OFF Minimum temperature CH boiler protection ON OFF Maximum temperature Opening direction Left Right Single stroke Minimum opening Proportionality coefficient CH sensor option CH sensor Additional sensor 1 Calibration Measurement stopping Factory settings Additional valve 1, 2 Registration Valve disconnected Pre-set valve temperature

21 Opening time Type of valve CH floor Room regulator Control without room regulator RS regulator - reduction RS regulator - proportional Standard regulator Air basis control Valve pump Always turned on Always turned off Turned on above the threshold valve Turn on temperature Reverse flow protection ON OFF Minimum temperature Single stroke Minimum opening Proportionality coefficient CH sensor option CH sensor Additional sensor 1 Sensor option Calibration Measurement stopping Factory settings Valve dismantlement VI.c.1) Registration In case of additional valves, it is necessary to register the valve by entering the number of module (indicated on the module frame, e.g.: ST-431N) in order to configure its parameters. VI.c.2) Valve activation/deactivation This function allows the user to deactivate the control. VI.c.3) Pre-set valve temperature This parameter defines the necessary temperature to be maintained by the valve. In case of proper operation, the water temperature behind the valve comes closer to the pre-set value. VI.c.4) Opening time This parameter defines the time necessary for the valve solenoid to open the valve in the 0% to 100% position. This valve should be adjusted by the value according to solenoid nominal value. VI.c.5) Type of valve With this parameter the user selects the type of controlled valve:

22 o o CH - selected if the user wants to control CH chain temperature. FLOOR - selected if the user wants to control the temperature of underfloor heating chain. It protects the underfloor heating equipment from hazardous temperature. If the user chooses CH as the type of valve and connects it with the underfloor heating system, it can damage the fragile floor equipment. VI.c.6) Room regulator This function allows the user to select and to set the room regulator operation that controls the valve. o Control without room regulator This option must be chosen if the user does not want the room regulator to influence the operation of the valve. RS regulator - reduction This option must be selected if the valve is controlled with room regulator with RS interface by reducing the pre-set temperature with advance value. In case of selection of this function, the menu shows option: Room reg. temp lower o RS regulator - proportional When this type of room regulator is selected, the valve is controlled according to Change of pre-set valve temp. and Room temperature difference parameters (these parameters are shown in menu when this preparation is selected). By activating this room temperature regulator, you can monitor the current temperature of CH boiler, water tank and valves. The regulator must be connected to ST-650 controller RJ (telephone) socket by using 4-strand cable with respective plugs (RS socket). o TECH standard regulator This option is selected if the valve is controlled by room regulator with RS interface. Regulator functions according to the parameter set by Room reg. temp lower. o Standard valve regulator This option should be selected if the valve is controlled by the room regulator of two conditions (without RS interface). o Room reg. temperature lower This function is activated only if TECH standard regulator or standard valve regulator is selected. The user defines the valve temperature reduction value which is reduced when the room regulator reaches the pre-set temperature. o Room temperature difference Note These parameters are related to RS regulator - proportional. This setting is used to define the single change in the current room temperature (the precision is 0.1 C), when the pre-set valve temperature is changed (the function is accessed only by TECH room regulator with RS interface). For example: Setting: room temperature 0.5ºC difference setting: change the pre-set valve temperature by 1ºC

23 Setting: pre-set valve temperature 40ºC Setting: pre-set room regulator 23 o C temperature 1st case. If the room temperature increases up to 23.5ºC (0.5ºC above the pre-set room temperature), the valve is closed in such a scope that the pre-set value of valve reaches 39ºC (temp. reduction by 1ºC). 2nd case. If the room temperature drops down to 22ºC (1ºC below the pre-set room temperature), the valve is opened in such a scope that the pre-set value of valve reaches 42ºC (temp. increase by 2ºC). o Pre-set temperature change Note These parameters are related to RS regulator - proportional. This parameter is used to set valve temperature degrees used to increase or decrease single change of room temperature unit (see: Room temperature change). This function is activated with TECH room regulator and related to room temperature difference parameter. o Room regulator valve pump When this function is selected, the valve pump is disconnected after the pre-set room regulator temperature is reached. o Valve closing When this function is selected, the valve is closed after the pre-set room regulator temperature is reached. VI.c.7) Air basis control Air control function shall be activated, the external sensor shall be protected from sunlight or the effect of weather conditions should be removed. When installed in a necessary place, it is necessary to turn on weather control function in controller menu. For proper functioning of valves, the user defines the pre-set temperature (behind the valve) in 4 interim external temperatures: -20ºC, -10ºC, 0ºC and 10ºC. The user chooses external temperature value with LEFT and RIGHT KEY and defines the pre-set temperature with arrows UP and DOWN. The monitor the shows the heat curve. Heat curve is a curve used to set the controller s temperature according to the external temperature. In our controller, this curve is related to four external temperatures. The more the dots in the curve, the higher is the precision that ensures the flexibility. In our opinion, the four dots curve provides a very good compromise, therefore, it is possible to set the curve form in a precise and easy manner. VI.c.8) Valve pump Valve pump This option allows the user to choose the pump operation mode: always ON - the pump operates continuously despite the temperature; always OFF - the pump is constantly disconnected and the regulator controls only the valves; ON above the threshold the pump operates on a higher than pre-set temperature. If the pump is activated above the threshold temperature, the user must set pump activation threshold temperature.

24 VI.c.9) Reverse flow protection This function allows to set boiler protection parameters for the cool water not to return from the main circulator piping that may result in the corrosion due to low temperature. The protection of this reverse flow is set by closing the valve when the temperature is too low until the necessary temperature is reached in the boiler short circuit. After activation the user sets the minimum acceptable reverse flow temperature. VI.c.10) CH boiler protection Note This function is accessible when the valve is installed. Protective function protects from excessive temperature formed in the CH boiler. The user sets the minimum acceptable temperature of the return cycle. If the temperature increases dangerously, the valve is closed to cool down the CH boiler. This function acts throughout the entire time. VI.c.11) Opening direction Note This function is accessible when the valve is installed. If after the connection of valve to the controller it appears to be connected in a reverse order, it is not necessary to change the power cable. It is enough to change the opening direction of this parameter: LEFT or RIGHT VI.c.12) Single stroke It is a maximum single stroke (closing and opening) for one temperature sample to be performed with the valve. If the temperature almost meets the set temperature, the stroke is calculated according to PROP_COEFF parameter value. The lower the single stroke, the more precise is the setting of temperature. However, it takes longer to reach the set temperature. VI.c.13) Minimum opening The parameter indicates the lowest valve opening parameter. Due to this parameter, the valve can be opened only minimally to support the lowest possible flow. VI.c.14) Proportionality coefficient Proportionality coefficient is applied to define valve stroke. The closer is the pre-set temperature, the lower is the stroke. If the coefficient is very high, the valve takes less time for opening, but at the same time the opening is not that precise. This formula is used to calculate the single opening percentage: (PRE-SET_TEMP - SENSOR_TEMP) * (PROP_COEFF /10) VI.c.15) CH sensor option This option is used to select the sensor used as CH sensor. It can be CH sensor or additional sensor (e.g. when a buffer is used in the system).

25 VI.c.16) Sensor option Note The function is accessed only for the additional valve (the external module is necessary). This option covers the reverse flow sensor and internal sensor. It allows the user to decide which sensor will be used for data to be submitted to operate the additional valve (valve module sensors or main controller sensors). VI.c.17) Calibration This function lets the user to calibrate the installed valve at any time. During this procedure, the valve is set in a safe position - if the CH valve is opened, and the basic valve is closed. VI.c.18) Measurement stopping This parameter sets water temperature measurement frequency (control) behind CH valve. If the sensor does not show temperature change (deviation from pre-set value), the electric valve will be opened or closed in the set stroke or returned to the initial temperature. VI.c.19)Maximum surface temperature Note This option is accessible when the base valve is selected. This function defines the maximum valve sensor temperature (if the base sensor is selected). When this temperature is reached, the alarm is activated and the valve is closed. VI.c.20) Factory settings This function allows the user to restore the factory settings of the selected valve. The parameters of factory settings do not change the selected valve type (CH or basic). VI.c.21)Valve dismantlement Note The function is accessed only for the additional valve (the external module is necessary). This option is used to dismantle the valve from controller s memory. Valve dismantlement function The valve is dismantled or the module is changed (it is necessary to register the new module). VI.d) Auxiliary contact This additional menu provides the parameters to calibrate the additional pump connected to the controller. When the type of pump is selected, the monitor shows additional menu where it is possible to configure the parameters of the additional valve. The following flowchart of CH boiler settings is provided: Auxiliary contact OFF CH pump Temperature threshold value Hysteresis

26 Sensor option DHW pump Temperature threshold value Hysteresis Pre-set temperature Maximum temperature Sensor 1 option Sensor 2 option Circulator pump Operation time Break duration Operation schedule Base pump Minimum temperature Maximum temperature Sensor 1 option Sensor 2 option VI.d.1) CH pump When this option is selected, the additional pump is operated as CH pump. The pump is activated when sensor temperature exceeds the threshold value of temperature. It is necessary to configure these parameters for this function to act properly o Temperature threshold value This parameter defines the time of additional pump activation which is operated as CH pump. When the selected sensor reaches this temperature, the pump is activated. o Hysteresis This parameter defines the hysteresis of threshold temperature of additional CH pump. It is the difference between the threshold temperature and disconnection temperature. E.g.: when the threshold temperature reaches 40 C and hysteresis 5 C. When the threshold temperature is reached, the CH pump is activated. It is deactivated when the temperature drops down to 35 C). o Sensor option It allows the user to choose which sensor should provide data to activate the additional CH pump. VI.d.2) DHW pump When this function is used, the additional pump is operated as CH pump. The pump is activated when sensor 1 temperature exceeds the threshold value of temperature. It remains activated until the temperature measured by sensor 2 reaches the pre-set value. Furthermore, it is possible to set the alarm temperature with sensor 2. When this value is reached, the emergency mode is turned on. It is necessary to configure the following parameters for the proper functioning of DHW pump: Temperature threshold value This option is used to set DHW pump activation temperature (the temperature is measured with sensor 1 which shows the temperature of the heat source - CH boiler). Below this temperature the pump is deactivated, when the temperature is higher, it functions until the pre-set temperature is reached. o Hysteresis This option is used to set the pre-set temperature hysteresis. In case this pre-set temperature is reached, the pump is deactivated. It is activated again when the sensor temperature drops below the pre-set temperature minus hysteresis. 2

27 E.g. if the advance temperature reaches 60 o C, and the hysteresis value is 3 C, DHW pump is deactivated when the pre-set 60 o C temperature is reached and activated again, when the temperature drops down to 57 o C. o Pre-set temperature This option is used to pre-set the temperature of the device. When this temperature is reached, the device is disconnected. The temperature is measured with sensor 2. o Maximum temperature This option is used to set the maximum temperature of sensor 1 (it measures the temperature of the heat source). When the temperature is reached, the devices is activated despite the current temperature of sensor 2. It protects the device from overheating. o Sensor 1 This option is used to select sensor temperature to provide device operation data which is connected to the additional contact - the source of heat (activation threshold). o Sensor 2 This option is used to select sensor temperature to provide device operation data which is connected to the additional contact - the source of heat (pre-set temperature). VI.d.3) Circulator pump In case this option is selected, the additional pump is operated as circulator pump. The pump controls the valve which mixes hot water circulating between CH boiler and DHW collection tanks. It is necessary to configure the following parameters for proper functioning of the circulator pump: o Operation time This parameter defines pump operation duration. o Stopping This parameter indicates the frequency in which the circulator pump is activated during its operation. o Operation schedule The user may program the everyday schedule of pump operation and inaction in the precision of 30 min. The pump is turned on in the frequency shown in Pause time parameter and remains active for the period of time set in the Operation time. It is possible to copy the time setting. VI.d.4) Base pump In case this option is selected, the additional pump is operated as the base pump. The operation is configured according to the following parameters: Minimum temperature This parameter defines the activation temperature of base pump (temperature reading is provided in sensor 1). The temperature is measured in CH boiler buffer. Maximum temperature This parameter defines the deactivation temperature of base pump (temperature reading is provided in sensor 2). Sensor 1 option This function is used to select the sensor providing the activation data of base pump (it includes the Minimum temperature parameter). Sensor 2 option This function is used to select the sensor providing the activation data of base pump (it includes the Maximum temperature parameter).

28 VI.e) Room regulator This function allows to set the operating parameters of room regulator which is connected to the pellets-fired boiler controller. It is necessary to launch room regulator which is connected by choosing the necessary room regulator type. Up to three room regulators can be connected to the controller. VI.e.1) TECH RS regulator Select this option if you want to connect room regulator with RS interface. Such regulator lets the user to review the current CH boiler parameters and to change certain settings, e.g. advance CH boiler temperature, advance DHW temperature. VI.e.2) Standard regulator 1 / Standard regulator 2 Select this option if you connect the regulator of two technical conditions. Such regulator sends a signal to the main controller and indicates whether the room temperature was achieved or not. VI.e.3) Room regulator CH pump If this function is activated, the CH pump is deactivated when the room regulator sends a signal notifying about the reached room temperature. VI.f) Time settings This function is used to set the desired time. This setting is important for the weekly control in order for the device to function properly. VI.f.1) Clock settings This function is used to set the current time. VI.f.2) Date settings This function is used to set the current date. VI.g) Fuel level calibration After the proper performance of fuel level calibration, the user can review the current fuel level in the controller s screen. During the first step, the fuel is filled to the fuel tank and the option Fuel tank full is selected. The controller remembers this level (100%). When no fuel is left in the fuel tank after a certain period of time of CH boiler operation, the user shall choose the option Fuel tank empty. This allows the fuel tank to be calibrated and the controller automatically informs the user on the current fuel level. When the fuel level desk is chosen in the main screen, the monitor shows the set amount of the remaining fuel (%) and the forecasted time for the consumption of fuel (days and hours). Such calibration is usually performed once. When the fuel tank is filled again, it is enough to select option Fuel tank full in the user menu. VI.h) External temperature correction This function allows the calibration of the external sensor. VI.i) GSM module NOTE This control type is applied in case of acquisition and connection of additional control module ST-65 which is not included in the standard controller set. GSM module is a selected device which communicates with another controller and lets the user to control CH boiler with a mobile phone (remotely). The user sends SMS each day when the alarm goes on. Furthermore, after sending the text report, the user receives

29 a reply on the current temperature of all sensors. After the confirmation code is entered, it is also possible to change the set temperature remotely. The GSM module can function irrespective of the CH boiler controller. It contains two additional devices with temperature sensors, one entered contact which is used at any configuration (contact closing/opening setting) and one controlled output (e.g. the possibility to connect additional contact, to be used for the control of any electrical circuit). When any sensor reaches the maximum and minimum set temperature, the module automatically sends the SMS message with such information. A similar procedure is applied when opening or closing contact input which can be used as the ordinary property protection mean. If GSM module is planned in the ST-560 controller, it should be activated by choosing ON option (MENU>Fitter's menu>gsm Module>ON). VI.j) Internet module Note This type of control is accessible when acquiring and connecting additional module ST-505 which is not included in the standard set of controllers. Internet module is a device allowing the user to control CH boiler remotely by internet or local network. The user controls all CH boiler system devices in the home computer screen and each operating device is illustrated in the scheme. In addition to the possibility to review the temperature of each sensor, the user can change temperatures of pumps and mixing valves. Having activated the module and selected DHCP option, the controller automatically sends such parameters to the IP address, IP mask, lock address and DNS address from the local network. If any problems arise when sending the network parameters, they can be set manually. The procedure for the receipt of such parameters is described in internet module manuals. Module password reset function is applied when the user changes the default passwords in the login page. If the user loses the new password, the default password may be restored by setting the module password anew. VI.k) Factory settings This function is used to restore factory settings. VI. Protective equipment and alarms In order to ensure safe and smooth operation, the protective equipment is fitted in the regulator. In case of alarm, the sound signal is activated and the monitor shows a respective message. In order for the controller to function on the operating mode, press MENU. In case of CH temperature too high alarm, it is necessary to wait until the temperature drops below the alarm temperature. VII.a) Fire control During the CH boiler operation, the controller sets the loss of flame (due to fire sensor). If the loss of flame is set, the controller moves to the second extinguishing stage (see Section IV) please use the grating cleaning indications. Then the ignition procedure is performed anew. VII.b) Thermal CH boiler protection The bimetal mini sensor is fitted in the controller (fitted next to the CH boiler temperature sensor) which automatically disconnects the fan from the power network when the alarm temperature exceeds 90 o C. It does not allow the water to boil in the boiler.

30 Otherwise, the boiler would overheat and this would cause damage to the controller. When this protective equipment is activated and the temperature drops down to the safe level, the sensor automatically turns off. In case the sensor is damaged or overheated, the ventilator is also disconnected. In case the CH boiler protective equipment is of a closed system type, the STB type temperature limiter is used instead of bimetal mini sensor. VI. C) Automatic sensor control In case of damage to one of the temperature sensors (CH, DHW or fuel tank), the alarm signal is activated and the monitor informs about the failure, e.g.: CH sensor damaged. Both the feeder and the fan are deactivated. The pump functions despite the current temperature. If CH sensor or feeder sensor are damaged, the alarm is activated until the installation of a new sensor. If DHW sensor is damaged, the alarm must be deactivated by pressing the MENU button the controller restores the operation with a single pump (CH). The new sensor has to be installed in order to use all the CH boiler operation modes. VII.d) CH boiler protection from the boiling water This protection is applied only for the water boiler priority mode when the water tank is not sufficiently heated. When the set water boiler temperature is 55 O C, whereas the actual CH boiler temperature reaches 62 O C (also called the priority temperature), the controller disconnects the fan feeder. If the CH boiler temperature is increasing and reaches 80 O C, the CH pump is switched on. If the temperature increases further, the alarm is activated under the 85 O C temperature. It usually happens when the water boiler or the pump are damaged or in case of improper installation of the sensor. When the temperature drops down at 60OC, the controller turns on the fan and the feeder and operates on the set mode until the temperature of 62 O C is reached. VII.e) Temperature protection The controller is characterised by additional protection against hazardously increasing temperature. If the alarm temperature exceeds 83 o C, the fan is deactivated and the pumps are activated to distribute hot water throughout the entire equipment. When the temperature exceeds 85 O C, the alarm is activated and the monitor shows the following alarm message: Temperature too high VII.f) Thermal CH boiler protection (STB) STB safety thermostat is installed in a closed CH system controller which protects the CH boiler from extensive increase in the temperature. In case the pre-set disconnection value is exceeded (default value: 95 o C), the feeding circuit contacts of the fan are opened. The fan can be reactivated only manually after pressing the safety thermostat reset button for the sensor to cool down. VII. h) Fuse The fuse WT 6.3A that protects the network is installed in the controller. It is not possible to use a higher capacity fuse as this may lead to the damage of the controller. VII. Maintenance and technical data Before and during the heating season, it is necessary to check the technical condition of ST-560 controller cables. The user also has to check if the controller is well installed and it must be clean. It is recommended to measure the earthing parameters of engines (CH pump, DHW pump, fan and feeder).

31 TECHNICAL DATA No Specification Unit 1 Supply voltage V 230V/50Hz +/-10% 2 Power consumption W 10 3 Ambient temperature OC Feeder output load A 2 5 Pump output load A Fan output load A Temperature measurement interval O C Measurement accuracy O C 1 9 Temperature parameter interval O C Sensor thermal resistance O C Fuse A 2x6.3

32 Principal scheme of the connection of controller s regulated devices and sensors 1. Pellet boiler + radiators + boiler + floor heating FAUCET PUMP Automatic mixing unit LK ARMTUR 810 or LADDOMAT 21 DIRT COLLECTOR 3-WAY VALVE BOILER CONNECTION SCHEME NON-RETURN VALVE SAFETY GROUP EXPANSION VESSEL T4

33 Before the boiler is started for the first time, it is necessary: - to check if the heating system and devices are in compliance with the project; - to check if the heating system and the boiler are filled with water and the air is discharged from the system; - to check if the heating system is hermetic; - to check the exhaust emissions channels; - to test the heating regulation; - to familiarize the user with boiler manual and the terms of use; - to provide the date of initial putting into operation in the warranty sheet. Use of boiler Removal of ashes: In view of the quality of used fuel, the ashes are removed in various periodicity, but sufficiently frequently for the ashes not to reach the upper part of the burner. The ashes are usually eliminated when the boiler is not operating and filled with fuel. Note. Before starting to clean the boiler, it is recommended to wear gloves. Cleaning of boiler and burner: IMPORTANT! For the proper functioning of boiler, there should be no resin, volatile ashes or soot on their internal walls. For this reason, it is necessary periodically but at least once in two weeks to clean the boiler and the burner with the scraper and brush. Before cleaning the burner, the boiler should be cooled down. In case the boiler is cooled down, it is necessary to remove the pellets from the top part of the burner down to the elbow. After the removal of pellets, it is necessary to clean the walls of burner carefully and to clean the air feed openings. When the cleaning is performed, the burner can be removed from the boiler for easier cleaning. If the diameter of the burner is significantly narrowed and a solid ring is formed (Example 1), the burner requires cleaning. Please use the hammer, scraper or other Example 1 tools to clean the burner and to eliminate the formed ring and other dirt. For your convenience, we recommend to remove the burner from the boiler. This will ensure easier cleaning process. Please remove the accumulated ring by hitting hard with the hammer and remove the remaining dirt with a scraper or any other abrasive tool. After cleaning, the burner should look as in the picture below (Example 2). Example 2