eta HACK 350 Service Manual

Tel: +43 (0) 7734 / 22 88 -0 Fax: +43 (0) 7734 / 22 88 -22 [email protected] www.eta.co.at

This document helps support you with the cleaning and maintenance of the boiler. The required steps are listed in detail here. Take note of the date of the cleaning or maintenance and any faults that may have occurred. This facilitates troubleshooting for the expert (system operator, heating technician...). For services (such as commissioning, mainte- nance, fault fixing provided by ETA customer service), the service reports are provided in digital form. For clarity, you should staple these reports to this document or enclose them. Commissioning data Enter the boiler number (printed on the type plate), the date of commissioning as well as the heating technician who commissioned the system. Copyright All contents of this document are property of ETA Heiztechnik GmbH and are protected by copyright. Any reproduction, transfer to third parties or use for other purposes is prohibited without written permission from the owner. Subject to technical alterations We reserve the right to make technical modifications without notice. Printing and typesetting errors or changes of any kind made in the interim are not cause for claims. Individual configurations depicted or described here are only optionally available. In the event of contradictions between individual documents regarding delivery scope, the information in our current price list applies. Explanation of symbols Instructions and information Layout of safety instructions SIGNAL WORD! Type and source of danger Possible effects • Measures for avoiding the danger Types of safety instruction CAUTION! On non-compliance with this safety instruction, there is a risk of material damage. WARNING! On non-compliance with this safety instruction, there is a risk of physical injury. DANGER! On non-compliance with this safety instruction, there is a risk of major physical injury. Commissioning data Boiler number: ________________________________________ Commissioned on: _________________________________________ Commissioned by (company): _________________________________________ _________________________________________ _________________________________________

2 Cleaning and maintenance Maintenance openings and components 1 Draught fan of flue gas recirculation 2 Maintenance cover for flue gas recirculation piping 3 Draught fan 4 Heat exchanger cover 5 Maintenance cover for reversing chamber on heat exchanger 6 Combustion chamber door 7 Maintenance cover for flue gas recirculation (behind panel) 8 Ignition fan 9 Actuator for primary air 10 Maintenance cover for secondary combustion zone

5 1 Drive of heat exchanger cleaner 2 Temperature sensor of combustion chamber 3 Actuator for flue gas recirculation flap 4 Maintenance cover for flue gas recirculation (behind panel) 5 Boiler mains switch 6 Maintenance cover for reversing chamber on heat exchanger

The conveyor depicted here is the standard con- figuration. 1 Drop chute maintenance cover 2 Rotary valve maintenance cover 3 Safety switch for rotary valve maintenance cover 4 Drop chute safety switch Fig. 2-1: Rotary valve position sensor

General information 7 2.1 General information Operation only by trained personnel The product may be operated by trained adults only. Training may be provided by the heating technician or our customer service. Please read the associated doc- umentation carefully in order to avoid errors during operation and maintenance. Persons who lack experience and knowledge as well as children may not operate, clean, or maintain the product. Performing regular cleaning and maintenance To ensure satisfactory functioning, cleaning and maintenance must be performed at regular intervals. Carry out this work within the intervals stated here. All tasks where the maintenance table reads "Customer" or "Customer or expert" in the column "To be carried out by" can be carried out by any trained adult. Instructions can be provided by the heating technician or our customer service. Steps that are marked with "Expert" only can only be carried out by the heating technician or our customer service. Checking the boiler counters The counters can be seen in the boiler's text menu. Counter [Full load hours since maint.] is used for the service intervals. If it has reached one of the listed intervals, maintenance is required. This counter is in: Counters Full load hours since maint.

2.2 Maintenance table Tasks Regular ly Every 3,000 h or once a year Every 6,000 h or every 2 years to be done by Check fill level of ash bins X X X Customer Check heating system's water pressure X X X Customer Check air intake in installation room X X Customer Clean flue tube X X Customer Clean combustion chamber X X Customer Check lining of the combustion chamber X X Customer Check the firebed switch X X Customer Visual check of the stoker screw X X Customer Clean ignition fan and openings X X Customer Check protective elements and grate elements X X Customer Visual check of the ash cross screw X X Customer Check grate ash screw X X Customer Clean roller guide of the moving grate X X Customer Remove ash from the reversing chamber X X Customer Check turbulators X X Customer Clean flue gas recirculation ducts X X Customer/expert Clean the heat exchanger X X Customer/expert Clean connection pipe to draught fan X X Customer/expert Visual check of the heat exchanger screw X X Customer/expert Clean flue gas temperature sensor X X Customer/expert Clean flue gas recirculation piping, check flue gas recirculation flap X X Customer/expert Clean draught fan of the flue gas recirculation X X Customer/expert Lubricate heat exchanger cleaner drive X X Customer/expert Check stoker drive chain X X Customer/expert Check the seal of the ash bin or the transfer coupling X X Customer/expert Check heat exchanger ash screw X X Customer/expert Clean the lambda probe X X Customer/expert Visually check safety valves X X Customer/expert Visually check thermal relief valves X X Customer/expert Check operational readiness of safety devices in fuel path X X Customer/expert Clean the upper area of the heat exchanger X Expert Clean draught fan X Expert Check seal on heat exchanger cover X Expert Check safety switch of the discharge X Expert Check rotary valve stop X Expert Check silicon hoses for differential pressure switch and transmitter X Expert Check air valve X Expert Check automatic closing of the actuators X Expert

Maintenance table 9 Check seal on combustion chamber door X Expert Calibrate lambda probe X Expert Perform heating test X Expert Reset maintenance counter X Expert Tasks Regular ly Every 3,000 h or once a year Every 6,000 h or every 2 years to be done by

2.3 Regular maintenance Check fill level of ash bins The boiler does not have to be switched off to empty the ash bins or container. Before starting the de-ashing emptying, press the [De-ash] button. This prevents the ash screw from switching on during the emptying process. If the ash screw already has a malfunction, first empty the ash bins or the container and then acknowledge the fault. De-ashing with transfer flap 1. Lift the protective mat from the underside. Move the container to the side and empty. Fig. 2-2: Protective mat 2. Before placing the protective mat, make sure the adhesive seal is in a good condition to prevent ash from escaping. Fig. 2-3: Seal on the sealing plate De-ashing with ash bins 1. Turn the locks on the ash bin lid upwards by 90°. Fig. 2-4: Open the locks 2. Push the lid up and fix in "Park position". Fig. 2-5: Park position 3. Empty the ash bins. Unhook the lid from "Park position" and fix to the ash bin with the locks. DANGER! Risk of injury from the ash screw If only one ash bin or none at all is connected, the ash screw is accessible from below. For this reason, operation with only one ash bin or none at all is prohibited. In addition, the boiler would take in leak air and hot ash would fall to the ground, increasing the fire risk.  The boiler may not be operated for more than 2 minutes without ash bins or an ash container.

Regular maintenance 11 Check heating system's water pressure The heating system's water pressure is measured by the control system and displayed on the screen. A visual check is still necessary though. In buildings with up to three storeys, the optimum water pressure in a cold heating system is between 1 and 2 bar. For a warm heating system, the optimum water pressure is between 1.5 and 2.5 bar. If the water pressure is too low, fill the cold heating system to approx. 2 bar. Do not fill to a higher pressure, as water expands with increasing temperature and the water pressure also rises when the boiler is heating. The safety valve triggers at approx. 2.8 bar. If the boiler is operated at maximum 6 bar water pressure, the values listed above must be increased accordingly.

Cleaning and maintenance 2.4 Every 3000 hours / annually Before this maintenance, perform all steps for the preceding maintenance intervals Before this maintenance, all steps for the preceding maintenance intervals must be performed. Stop heating End the boiler's heating mode with the On/Off switch in the boiler overview window. The boiler performs an ember burnout and then changes to [Switched off] mode. Press the [De-ash] button to make the boiler perform a final de-ashing. Switch off boiler via mains switch WARNING!  Switch off the electricity to the boiler via the mains switch. This prevents injuries caused by switching the boiler on inadvertently. WARNING! Burns caused by hot parts Even after the boiler has been switched off, there will still be a danger of burns caused by the cleaning and maintenance covers of the combustion chamber and the heat exchanger, and by the combustion chamber door. These parts cool off more slowly, so they may still be hot.  Allow the boiler cool off long enough, or wear appropriate protective clothing. Air intake in installation room must be clear Air intake for the boiler in installation room must be clear. It may not be shut or closed. Cleaning the flue pipe Sweep the flue pipe from the flue outlet to the chimney, and remove flue ash from the chimney using a vacuum cleaner. Sweep the ash into the chimney, not into the boiler. Clean combustion chamber Carefully pull the temperature sensor of the combustion chamber out by loosening the screw on the boiler. Fig. 2-6: Temperature sensor of combustion chamber Take off the maintenance cover of the secondary combustion zone by loosening the 4 screws. Fig. 2-7: Maintenance cover

Every 3000 hours / annually 13 Using the poker, remove loose and baked on ash from the upper part of the combustion chamber. Sweep the ash backwards into the heat exchanger or forwards onto the moving grate. Fig. 2-8: Upper part of the combustion chamber A thin coating of ash (~ 5 mm) may remain on the lining. This does not adversely affect operation and acts as an additional protective layer. Significant discolouration of the lining is normal. CAUTION! Never treat the lining with force, as this may cause parts of it to be knocked off. Open the combustion chamber door and remove baked on ash deposits from around the opening and from the combustion chamber door Fig. 2-9: Combustion chamber door Next, using the poker, remove baked on ash deposits from inside the combustion chamber and sweep onto the moving grate. Fig. 2-10: Lower part of the combustion chamber A thin coating of ash (~ 5 mm) may remain on the lining. This does not adversely affect operation and acts as an additional protective layer. Significant discolouration of the lining is normal. Then re-insert the combustion chamber temperature sensor in the opening and secure with the screw. Removing ash deposits near the opening of the secondary combustion zone Remove ash deposits around the opening of the secondary combustion zone and also from the maintenance cover. Fig. 2-11: Opening of secondary combustion zone Otherwise, the maintenance cover will not seal tightly when it is subsequently closed.

Cleaning and maintenance Fit maintenance cover for secondary combustion zone Remove the ash from the opening for the maintenance cover with a vacuum cleaner so the maintenance cover can form a proper seal. Attach the maintenance cover for the secondary combustion zone to the boiler using the 4 screws. Tighten the screws evenly and cross-wise. Fig. 2-12: Maintenance cover Cleaning openings in the lining Clean the openings on both sides of the lining and remove any baked on ash deposits. Then vacuum the openings with an ash or vacuum cleaner Fig. 2-13: Openings in the lining Check lining of the combustion chamber After cleaning, check the combustion chamber lining for cracks or damage. Significant discolouration of the lining is normal. Fig. 2-14: Discolourations Check the firebed switch Manually actuate the firebed switch and check that it moves easily. Fig. 2-15: Firebed switch In the combustion chamber, check the position of the firebed switch actuating lever. Fig. 2-16: Firebed switch actuating lever

Every 3000 hours / annually 15 Visual check of the stoker screw Visually check the stoker screw for damage from the combustion chamber. It can be a bit burnt on the ends due to the high levels of heat. It must be replaced if the stoker screw is partially burnt on the ends. Fig. 2-17: Stoker screw Clean ignition fan and photocell Remove both ignition fans from the boiler. Fig. 2-18: Removing the ignition fan Detach the ignition tube by loosening the 4 screws and remove the ignition rod. Clean the visible photocell with a soft cloth. Then reattach the ignition tube. Also clean the openings in the boiler for the ignition tube. Fig. 2-19: Ignition openings Re-install both ignition fans and attach them to the boiler with the chain.

Cleaning and maintenance Check protective elements and grate elements Check the protective elements for damage or warping on both sides of the moving grate. Fig. 2-20: Protective elements Also check the individual grate elements for damage. Fig. 2-21: Grate elements Visual check of the ash cross screw From the combustion chamber, visually check the ash cross screw for damage. Fig. 2-22: Ash cross screw Checking the grate ash screw Lift up the panel slightly and remove from the boiler. Fig. 2-23: Cover panel Take off the maintenance cover by loosening the screws and nuts. Fig. 2-24: Maintenance cover Carry out a visual check and remove any possible foreign bodies (nails, stones...). Fig. 2-25: Grate ash screw Inspect the seal of the maintenance cover to ensure it is in good order, and replace if necessary. WARNING!  Never operate the boiler with defective seals. Clean roller guide of the moving grate Clean the 4 rollers as well as the guides of the moving grate and check for any possible foreign bodies.

Every 3000 hours / annually 17 For better checking and cleaning, remove the panel as well as the maintenance cover on the opposite side. Fig. 2-26: Roller guide of the moving grate Finally, replace the seals of the maintenance cover, reinstall it on the boiler and hook in the panel. Remove ash from the reversing chamber The maintenance covers for the reversing chamber are situated on each side of the heat exchanger. Take off both maintenance covers by unscrewing the four screws on each one and remove the ash with the poker. Fig. 2-27: Maintenance cover of the reversing chamber Fig. 2-28: Maintenance cover of the reversing chamber Check the seals on both maintenance covers to ensure they are in good condition, replace if necessary. Cleaning the turbulators Check the ends of the turbulators for deposits and remove them if necessary. Fig. 2-29: Turbulators Clean flue gas recirculation ducts Remove the panels on both sides of the boiler by unscrewing the screws on the top and bottom. Fig. 2-30: Cover panel

Cleaning and maintenance Remove the two maintenance covers of the flue gas recirculation ducts on both sides of the boiler. Fig. 2-31: Maintenance cover for flue gas recirculation Using an ash vacuum cleaner, remove ash from the ducts. Likewise, clean the round openings of the flue gas recirculation on both sides. Fig. 2-32: Clean ducts Fig. 2-33: Clean ducts Check the seals of both maintenance covers to ensure they are in good condition, replace if necessary. CAUTION!  Never operate the boiler with damaged seals. Reinstall the maintenance cover for the flue gas recir- culation and also the panels. Clean the heat exchanger First, loosen the two knurled nuts of the heat exchanger covers by turning them anti-clockwise. Fig. 2-34: Knurled nut Next, turn each of the ball knobs by 180°. Fig. 2-35: Ball knob

Every 3000 hours / annually 19 Lift the two heat exchanger covers and open fully. Fig. 2-36: Heat exchanger cover WARNING! Injuries caused by heavy moving parts Possible crushing injuries due to the two heavy heat exchanger covers.  Work carefully around the open heat exchanger covers so that they do not accidentally fall shut. Remove the flue cover by unscrewing the two screws. Fig. 2-37: Flame pipe cover When this is removed, the first tube of the heat exchanger is visible. Clean it with the poker. Sweep ash that has collected at the top down into the reversing chamber. Fig. 2-38: First tube of the heat exchanger Clean connection pipe to draught fan Check the connection pipe from the heat exchanger to the draught fan for contamination and remove if necessary. Fig. 2-39: Connection pipe to draught fan

Cleaning and maintenance Visual check of the heat exchanger ash screw Perform a visual check of the cyclone tubes. You should be able to see the heat exchanger ash screw below them. Fig. 2-40: Heat exchanger ash screw If it is not visible, close the heat exchanger covers, switch on the boiler via the mains switch and press [De-ash] to begin de-ashing. Perform the visual check once again and again switch off the electricity to the boiler via the mains switch. Close heat exchanger cover Carefully close both heat exchanger covers. Next, turn the two ball knobs clockwise until the stop. Then tighten the two knurled nuts evenly and cross- wise by turning them clockwise. Clean flue gas temperature sensor The temperature sensor is located in the flue connection. To clean, loosen the screw and pull out the flue gas temperature sensor. Fig. 2-41: Flue gas temperature sensor Clean the sensor with a soft cloth and then re-install it. When fixing the temperature sensor in place, only tighten the screw hand-tight so as not to damage the sensor.

Every 3000 hours / annually 21 Clean flue gas recirculation piping Take off the two maintenance covers of the piping and remove ash from the piping using an ash vacuum cleaner. Fig. 2-42: Maintenance cover Check the flue gas recirculation flap in the piping. It must always be closed when there is no electricity supplied to the boiler. Fig. 2-43: Flue gas recirculation flap Manually actuate the flap actuator. Unlock the actuator on the red button and actuate manually with an Allen key. Fig. 2-44: Actuator Clean draught fan of the flue gas recirculation Remove the draught fan of the flue gas recirculation by loosening the wing screws. Fig. 2-45: Draught fan With a soft brush (not a wire brush) or with compressed air, clean the draught fan's impeller carefully so that the impeller does not become unbalanced.

Cleaning and maintenance Replace the seal on the draught fan. Fig. 2-46: Seal Lubricate the screws with heat-resistant lubricant and reattach the draught fan to the fan housing. Tighten the screws evenly. Lubricate the heat exchanger cleaning drive Push the drive cover upwards and remove from the boiler. Lubricate the spring, guide and bearing with heat- resistant lubricant. Finally, re-attach the cover to the boiler. Check stoker drive chain WARNING!  Switch off the electricity to the boiler via the mains switch. This prevents injuries caused by switching the boiler on inadvertently. Remove the drive chain cover by loosening the acorn nuts. Check the tension of the stoker drive chain. The chain may sag by 1 - 2 cm without effort.

Every 3000 hours / annually 23 If it sags more, the chain must be tensioned with the two set screws on the side. Fig. 2-47: Levelling screws Lubricate the drive chain with chain spray and replace the cover. Check the seal of the ash bin or the transfer coupling For external de-ashing with ash bins, check the seal on the ash bin lid to ensure it is in good condition and replace it if necessary. Fig. 2-48: Seals On the external de-ashing with transfer coupling, check the flap for tightness. Fig. 2-49: Flap in transfer coupling Check heat exchanger ash screw Take off the maintenance cover on the discharge connection of the ash screw. Fig. 2-50: Maintenance cover

Cleaning and maintenance Check whether the fork of the heat exchanger ash screw is evenly flush on the sealing ring. Also check the movement by pushing the ash screw in the axis direction. 1 Washer 2 Fork of the heat exchanger ash screw Clean the lambda probe Use a pipe wrench to unscrew the lambda probe's retaining tube. Fig. 2-51: Retaining tube Remove the lambda probe and the enclosed sealing ring from the boiler. Let the lambda probe cool off and clean it with a vacuum cleaner. Take special care to clean the openings in the head of the lambda probe. Fig. 2-52: Lambda probe Clean the lambda probe's seal seat in the boiler. It must be absolutely clean. Check it with a torch and clean out the coupling with a vacuum cleaner. The washer for sealing the lambda probe's metal flange and the seat in the boiler must be replaced when installing the probe. Fig. 2-53: Washer Tighten the lambda probe's retaining tube firmly with a pipe wrench (with 20 kg at 20 cm lever length). Checking the safety valves Perform a visual inspection of all safety valves of the heating system. The outlets of the safety valves may not drip. Fig. 2-54: Safety valve Perform this step only on weekdays, never on weekends during a cold winter, as there will probably be no heating technician available if the seal is defective. If the safety valve drips, open it with a quarter turn of the red cap and rinse it out (danger of scalding). If the safety valve still cannot be sealed effectively after being rinsed several times, it must be cleaned by a technician or replaced.

Every 3000 hours / annually 25 Checking the thermal discharge valves Perform a visual inspection of the two thermal discharge valves. The outlets of the thermal discharge valves must not drip. Check function of safety devices in fuel path Check the safety devices in the fuel path, such as the temperature-monitoring system, the manually operated extinguishing system or the automatic extin- guishing system. Also check malfunction indicators and alarms, for example if messages from the boiler room are displayed elsewhere. Switch the boiler on via the mains switch and start de-ashing. Establish the boiler's power supply at the mains switch. Press the [De-ash] button to de-ash the boiler. Switch the boiler back on with the On/Off switch.

Cleaning and maintenance 2.5 Every 6,000 hours / 2 years WARNING! The following activities may only be performed by qualified specialist personnel. If you carry out these activities without the correspond- ing specialist training, and above all without the required experience, safe operation is no longer guaranteed. The resulting defects and consequential damage are excluded from the guarantee and warranty. Equally an incorrect performance of these activities can lead to serious injuries. Before this maintenance, perform all steps for the preceding maintenance intervals Before this maintenance, all steps for the preceding maintenance intervals must be performed. Stop heating End the boiler's heating mode with the On/Off switch in the boiler overview window. The boiler performs an ember burnout and then changes to [Switched off] mode. Press the [De-ash] button to make the boiler perform a final de-ashing. Switch off boiler via mains switch WARNING!  Switch off the electricity to the boiler via the mains switch. This prevents injuries caused by switching the boiler on inadvertently. WARNING! Burns caused by hot parts Even after the boiler has been switched off, there will still be a danger of burns caused by the cleaning and maintenance covers of the combustion chamber and the heat exchanger, and by the combustion chamber door. These parts cool off more slowly, so they may still be hot.  Allow the boiler cool off long enough, or wear appropriate protective clothing. Clean the upper area of the heat exchanger Remove and detach the rail by loosening both nuts. Fig. 2-55: Rail Loosen the screws on the cyclone tubes and carefully remove the cyclone tubes from the boiler. Fig. 2-56: Cyclone tubes Loosen the screws to detach the cover. Fig. 2-57: Cover

Every 6,000 hours / 2 years 27 Remove contamination in the upper area of the heat exchanger. Fig. 2-58: Cleaning the area Vacuum out the head of the lambda probe using a vacuum cleaner. Do not dismantle the lambda probe. Fig. 2-59: Lambda probe Subsequently re-install the cover, the cyclone tubes and the rail. Clean draught fan Loosen the screws on the draught fan and carefully pull it out of the fan housing. The draught fan weighs about 32 kg. Secure it against falling down during removal and later re- installation. Fig. 2-60: Draught fan With a soft brush (not a wire brush) or with compressed air, clean the draught fan's impeller carefully so that the impeller does not become unbalanced. Replace the seal on the draught fan. Fig. 2-61: Seal Lubricate the screws with heat-resistant lubricant and reattach the draught fan to the fan housing. Tighten the screws evenly.

Cleaning and maintenance Check seal on heat exchanger cover Check the seals on both heat exchanger covers to ensure they are in good condition and replace them if necessary. Fig. 2-62: Check seal WARNING!  The boiler must not be operated with defective seals. Check safety switch of the discharge Check the safety switches on the drop chute and the maintenance opening. Fig. 2-63: Safety switch 1 Drop chute safety switch 2 Safety switch for rotary valve maintenance cover Check rotary valve stop WARNING! Danger of crushing from stoker drive chain  The boiler must be switched off. This prevents injuries caused by switching the boiler on inadver- tently. WARNING! Accidental remote switch-on  When performing maintenance work on the boiler, remote access to the ETAtouch control system must be prevented. Therefore, deactivate the "meinETA" and further ETAtouch control screens as well as disconnecting possibly connected control systems from the ETAtouch controller. In the factory configuration, the discharge screw and the rotary valve (or stoker screw) alternate in operation. This alternating operation of the screws is controlled by the sensor that monitors the position of the rotary valve. If the rotary valve cannot reach the position of the sensor, a warning is displayed on the screen. The warning can be acknowledged but does not stop heating. It is therefore helpful to check the boiler control system's error log to see whether the error has occurred in the past. Fig. 2-64: Rotary valve position sensor If the discharge screw and the stoker screw are in operation simultaneously, the setting for the [Rot- ValveStop] function needs to be checked in the boiler's text menu. It can be deliberately set to [No] if the used fuel requires it. The function can be seen with the [Service] access level under: Conveying system Stoker unit RotValveStop

Every 6,000 hours / 2 years 29 If the discharge screw and the stoker screw are in operation simultaneously and the function is set to [Yes], either the sensor is faulty or the gap between the screw in the gear and the sensor is too large and must be adjusted. The gap should be about 1 - 2 mm. Fig. 2-65: Gap between sensor and screw Check silicon hoses for differential pressure switch and transmitter If necessary, blow out the silicon hoses and re-connect them. Ensure the correct position during connection. The hoses must not be kinked or crossed over. Fig. 2-66: Differential pressure switch and transmitter in the control cabinet Fig. 2-67: Silicon hoses in control cabinet Fig. 2-68: Differential pressure transmitter Check air valve Manually actuate the primary air valve actuator and check movement. Fig. 2-69: Primary air valve

Cleaning and maintenance For manual operation, push the release button (red button) and manually turn the actuator through 90° with the set screw. Fig. 2-70: Manual operation of actuator 1 Set screw 2 Release button Also manually actuate the secondary air valve actuator and check movement. Fig. 2-71: Secondary air valve Check automatic closing of the actuators The additional circuit board [NS-A] provides an emergency power supply for the actuator and the primary air, as well as for the control flap in the flue gas recirculation. They close the control flap drives or the primary air valve respectively in the event of a power failure. Carry out the following steps to check automatic closing. Manually open primary air valve 1. Establish the boiler's power supply at the mains switch. 2. With the [Service] access level, switch to the outputs and inputs menu in the boiler's function block. 3. Select output [Primary air] and tap on the symbol. A window for manual mode opens. Press the [On] key so that the primary air valve moves to the open position. 4. Close the window. Next, manually open the control flap in the flue gas re- circulation. Manually open control flap 1. In the boiler function block, switch to the text menu. 2. Open the sub-menu for the control flap: 3. Set control flap demand [Demand] to [On]. 4. Select parameter [Output] and enter the value 10.0 V (=completely open). If both drives are in the open position, switch off the boiler power supply on the mains switch. Both drives must automatically turn back to the closed position. Check seal on combustion chamber door Open and then close the combustion chamber door. When closing, make sure that it closes tightly and with force. The sealing edges of the door frame must leave a clear indentation in the sealing cord of the combustion chamber door. Outputs Regulator flap Demand Output

Every 6,000 hours / 2 years 31 Leaks can be detected by variations in the colouration of the sealing cord. If leaks are found, it usually suffices to adjust the hinges. If the hinges cannot be adjusted any further, the sealing cord must be replaced. Fig. 2-72: Sealing cord of combustion chamber door To adjust the hinges, you must first remove the panel next to the combustion chamber door. To do so, unscrew both screws and remove the panel. Fig. 2-73: Remove panel On the two eye bolts, first slacken the front nut and adjust it by rotating a 1/4 turn anti-clockwise. Fig. 2-74: Rotating nuts a 1/4 turn Next, tighten the two rear nuts for fixing the eye bolts. Fig. 2-75: Re-attach the eye bolts Adjust the front hinges by slackening the two nuts on both hinges. Next, push both hinges uniformly approx 0.5 - 1 mm towards the boiler and tighten the nuts once more. Fig. 2-76: Adjusting the front hinges Finally, re-attach the panel next to the combustion chamber door. Calibrating the lambda probe The boiler's built-in lambda probe checks the residual oxygen content of the flue gas and uses it to control the combustion. To ensure reliability, the control system autonomously performs an automatic calibration after every 500 hours of operation. If you wish to perform an additional lambda probe cal- ibration, the control system features the [Addl. calibra- tion] function. This function can be selected with the [Service] access level and can be found under: Inputs Residual O2 Addl. calibration

Cleaning and maintenance Switch on this function and the additional calibration will now start. If the boiler is heating, it is automatically stopped first. De-ashing begins, then the boiler is purged with fresh air. After this, the residual oxygen content is measured and the lambda probe is automat- ically calibrated. Altogether, these steps can last a few hours. When the calibration is complete, the boiler goes back into operation and starts heating, if necessary. After another 100 hours of operation, the control system automatically performs another calibra- tion. Perform heating test To perform the heating test, put the boiler into emissions measurement mode. To do this, carry out the following steps. In the boiler overview window, press the [Measurement] button in order to enter the emissions measurement settings window. Fig. 2-77: Settings window for emissions measurement Press the [Start now] button so the boiler will start immediately. The control system ensures that sufficient heat is channelled to the buffer, the heating circuits and the hot water tank. After about 20 to 30 minutes in heating mode, the residual oxygen content should reach 6% to 9%. The current residual oxygen content is displayed in the boiler overview. If the value does not drop below 12% residual oxygen, the boiler is receiving leak air. The reason (leaky combustion chamber door, heat exchanger cover, etc.) must be identified and corrected. If possible, perform a flue gas measurement during the heating test. After the heating test, switch the boiler back to normal mode. To do this, press the [Deactivate measurement] button in the settings window. Reset maintenance counter When maintenance is complete, reset the counter. With the [Service] access level, it will be visible in the boiler text menu under: Counters Full load hours since maint. Reset counter?

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________

after 3000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path

performed by: _________________________

after 6000 hours. Tasks Notes Check fill level of ash bins Check heating system's water pressure _________ bar Check air intake in installation room Clean flue tube Clean combustion chamber Check lining of the combustion chamber Check the firebed switch Visual check of the stoker screw Clean ignition fan and openings Check protective elements and grate elements Visual check of the ash cross screw Check grate ash screw Clean roller guide of the moving grate Remove ash from the reversing chamber Check turbulators Clean flue gas recirculation ducts Clean the heat exchanger Clean connection pipe to draught fan Visual check of the heat exchanger screw Clean flue gas temperature sensor Clean flue gas recirculation piping, check flue gas recirculation flap Clean draught fan of the flue gas recirculation Lubricate heat exchanger cleaner drive Check stoker drive chain Check the seal of the ash bin or the transfer coupling Check heat exchanger ash screw Clean the lambda probe Visually check safety valves Visually check thermal relief valves Check operational readiness of safety devices in fuel path Clean the upper area of the heat exchanger Clean draught fan

Check safety switch of the discharge Check rotary valve stop Check silicon hoses for differential pressure switch and transmitter Check air valve Check automatic closing of the actuators Check seal on combustion chamber door Calibrate lambda probe Perform heating test Reset maintenance counter Tasks Notes performed on: _________________________ performed by: _________________________