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PreambleTo these instructionsThis device meets all basic requirements ofrelevant standards and guidelines.Its conformity has been verified. Allassociated documents and the originalDeclaration of Conformity are availablefrom the manufacturer.These operating instructions contain importantinformation for the safe and correct operation andmaintenance of the condensing gas boiler SB735.Correct fuelThis system requires the correct fuel to ensure a properoperation. During commissioning, your system installerwill enter the correct type of fuel, which your systemrequires, into the table below.CAUTIONSYSTEM DAMAGEthrough incorrect fuel.• Only use the correct fuel identified foryour system.USER NOTEWe recommend you seek the advice ofyour system installer if you intendchanging the fuel for your system.Use the following fuel:company stamp/date/signatureSubject to technical modifications.Constant development may lead to minor deviations ofillustrations, functional steps and specifications fromthose described/shown.Updating your documentationPlease let us know if you would like to make suggestionsto improve our documentation, or if you have noticedany errors.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de2Operating Instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

Index1 For your safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.1 Correct use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.2 Notes structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.3 Please observe these safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41.3.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51.3.2 Working on the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63 Using correct fill and make-up water . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73.1 Water description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73.2 Water quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 System start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94.1 Making the system operational . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94.2 Commissioning the control device and the burner. . . . . . . . . . . . . . . . . . . . . . . .95 System shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.1 Shutting down the control device and burner . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2 Shutting down the system in an emergency . . . . . . . . . . . . . . . . . . . . . . . . . . 106 Correcting burner faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 System maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127.1 Why is regular maintenance important? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127.2 Checking and correcting the water pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 137.2.1 When do you need to check the water pressure in your heating system? . . . . . . . . . . . . 137.2.2 Open systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147.2.3 Sealed systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/20033

1For your safety1 For your safetyThe SB735, condensing gas boiler, has been developedand built employing the latest technologies and safetyregulations.Ease of operation was given particularly high priority.Please observe the safety and operator’s instructions toensure optimum safe, economical and environmentallyfriendlyutilisation of your system.1.1 Correct useThe SB735 condensing gas-fired boiler was designedfor heating domestic hot water and, for example, thecentral heating of multi-occupancy buildings, as well aspublic and commercial buildings.1.3 Please observe these safetyinstructionsIncorrect operation of SB 735 boilers may lead tomaterial losses.• Only operate the boiler as intended and when it is inperfect condition.• Let a heating contractor install and maintain yourheating system.• Let your local heating contractor train you properly inthe use of this system.• Please read these operating instructions carefully.DANGER TO LIFE1.2 Notes structureTwo levels of danger are identified and signified bysymbols:WARNING!CAUTION!DANGER TO LIFEIdentifies possible dangers emanatingfrom a product, which might lead to seriousinjury or death, if appropriate care is nottaken.DANGER OF INJURY/SYSTEM DAMAGEPoints to a potentially dangeroussituation, which might lead to medium orslight injuries or to material losses.USER NOTEUser tips for the optimum utilisation andsetting of the equipment plus usefulinformation.WARNING!through the explosion of volatile gases.There is a risk of explosion if you can smellgas.• Keep open flames away. Do notsmoke. Do not use lighters.• Avoid sparks!Do not operate electrical switches, incl.telephone, plugs or door-bells.• Close the main gas shut-off valve.• Open windows and doors.• Warn all occupants, but do not usedoorbells.• Leave the building.• Call your gas supplier and your localheating engineer from outside thebuilding.• If necessary, notify police or fireservices.• Immediately leave the danger zone ifyou hear gas streaming out.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de4Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

For your safety 11.3.1 Location 1.3.2 Working on the heating systemDanger to lifeDanger to lifethrough poisoning.through the explosion of volatile gases.WARNING!Insufficient ventilation can lead todangerous flue gas leaks.• Ensure that the ventilation and exhaustair openings are neither restricted norclosed.• The boiler must not be operated, unlessyou immediately remedy the fault.WARNING!• Ensure that the installation, the gas andflue gas connections, the initial startup,the power connection, maintenanceand repair work are only carried out bycompetent specialists.• Ensure that work on parts of the gasinstallation are only carried out by alicensed specialist.WARNING!CAUTION!Risk of firethrough flammable material or liquids.• Never store flammable materials orliquids in the immediate vicinity of theheat generator.Boiler damagethrough contaminated combustion air.• Never use chlorinated cleaning agentsor halogenated hydrocarbons (as, forexample, contained in spray cans,solvents or cleaning agents, paints andadhesives).CAUTION!System damagethrough inadequate cleaning andmaintenance.• Have your system inspected, cleanedand maintained annually by a specialistcontractor.• We recommend you enter into acontract covering an annual inspectionand maintenance on a "as-requiredbasis".• Avoid frequent very dustyatmospheres.• Never hang laundry to dry in the boilerroom.System damagethrough frost.CAUTION!• Ensure that the boiler room is alwaysfree from frost.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/20035

2Product description2 Product descriptionThe following are components of the SB735,condensing gas-fired boiler (Fig. 1):2– Boiler block (Fig. 1, item 5) incl. thermal insulationand burner door (Fig. 1, item 4).The boiler block transfers the heat generated by theburner to the heating water. The burner door isdesigned to carry the burner and to close thecombustion chamber.13– Boiler jacket (Fig. 1, item 3), thermal insulation andboiler front walls (Fig. 1, item 1).The boiler shell and thermal insulation preventenergy loss.– Control device (Fig. 1, item 2) (Optional).The control device is designed to monitor and controlall electrical components of the SB735.1543Fig. 1SB735, condensing gas-fired boilerItem 1:Boiler front wallsItem 2:Control deviceItem 3:Boiler jacket panelItem 4:Burner doorItem 5:Boiler blockWe reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de6Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

Using correct fill and make-up water 33 Using correct fill and make-up waterThis chapter contains general information about thewater in your heating system.Observe the basic, system-specific requirements forwater quality in Chapter 3.2 "Water quality".3.1 Water descriptionIn your heating system, water is used as heat transfermedium. Water is given different descriptions dependingon its purpose.– Heating water:Water contained within your heating system.– Fill water:Water used for the first filling of your system beforecommissioning.– Make-up water:Water used for the re-filling your system in case ofwater losses.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/20037

3Using correct fill and make-up water3.2 Water qualityAll water contains substances, e. g. Ca (HCO 3 ) 2(calcium hydrogen-carbonate), which may influence thefunction of your heating system. These may lead tocorrosion, scaling and other deposits.Regularly check your water consistency and, ifnecessary, treat your fill and make-up water, to ensurethat your heating system remains economic, functional,operationally reliable and energy efficient.SYSTEM DAMAGECAUTION!through corrosion and scaling because offill and make-up water, which does notcomply with system-specific requirements.• Check with your local heatingcontractor or your water supplycompany regarding the Ca (HCO 3 ) 2concentration (calcium hydrogencarbonate)in your area.• You should treat the fill and make-upwater, if it does not comply with systemspecificrequirements. In such casescontact your local heating contractor.Observe the following table regarding the correct useand treatment of the fill and make-up water.This table is an extract from the Code of Practice K8"Water treatment for hot water heating systems" and theVDI 2035 "Water treatment guideline".Total rated boileroutput in MBHCa (HCO 3 ) 2 concentrationin mol/m³300 < Q ≤ 1600 ≤ 2.01601 < Q ≤ 3500 ≤ 1.5Maximum fill and make-up water volumeV max in m³Heating water pHvalueV max = three times the system volume 8.2–9.5300 < Q ≤ 1600 > 2.01601 < Q ≤ 3500 > 1.5Table. 1 Requirements of filling, make-up and heating waterQkW ( )V max = 0,0313 ⋅ ------------------------------------------------molCa( HCO 3 ) ⎛---------⎞2 ⎝m 3 ⎠8.2–9.5We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de8Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

System start-up 44 System start-upThis chapter explains how you prepare the system foroperation and how to commission the control device andthe burner.4.1 Making the system operationalYou should check the following to prepare the system foroperation:• the system water pressure see Chapter 7.2"Checking and correcting the water pressure",page 13),• whether the main fuel supply shut-off valve is open,• whether the heating system emergency stop switchhas been activated or the boiler room fuse isinserted.Let your specialist show you where the fill valve islocated in the pipework of your system (return).4.2 Commissioning the control deviceand the burnerStart up your boiler via the control device (in thisexample (Fig. 2): 2000 series Logamatic control device).By commissioning the control device, you alsoautomatically commission the burner. The burner canthen be started via the control device. For further detailsin this connection, see the operating instructions of therelevant control device or burner.• Switch the boiler water thermostat (Fig. 2, item 1) to"AUT".• Set the On/Off switch (Fig. 2, item 2) to "I" (ON).USER NOTE• Please observe the operatinginstructions of the control device.1 2Fig. 2Item 1:Item 2:2000 series Logamatic control deviceBoiler water thermostatOn/Off switchWe reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/20039

5System shutdown5 System shutdownThis chapter explains, how you shut down your boiler,the control device and burner. Furthermore, you will findexplanations as to how you can shut down your systemin emergencies.CAUTION!SYSTEM DAMAGEthrough frost.The system can freeze up if it is out of use,e.g. through a shut-down because offault(s).• Protect your heating system againstfrost damage, where temperaturesbelow freezing are expected.• Drain the heating water at the lowestpoint in the system, using the boilerdrain. To do this, open the air ventvalve at the highest point in the system.5.2 Shutting down the system in anemergencyUSER NOTE• Only in an emergency, shut off thesystem via the boiler room fuse orheating system emergency stop switch.In other dangerous circumstances, isolate the main fuelshut-off valve and the electrical power supply of thesystem via the boiler room main fuse or the emergencystop switch for the boiler room (see Chapter 1.3 "Pleaseobserve these safety instructions", page 4).• Shut off the fuel supply at the main fuel shut-off valve.5.1 Shutting down the control device andburnerShut down your boiler via the control device. The burneris automatically shut down when the control device isshut down.• Set the On/Off switch (Fig. 2, page 9) to "0" (OFF).USER NOTEFor further details in this connection, seethe operating instructions of the relevantcontrol device.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de10Operating instructions condensing gas boiler Logano plus SB735 • Issue 102003

Correcting burner faults 66 Correcting burner faultsHeating system faults are indicated in the control devicedisplay (Fig. 3, item 2). You will find detailed informationregarding fault displays in the operating instructions ofthe respective control device. In addition, if the burnerdevelops a fault, a fault lamp on the burner and anindicator on the (Fig. 3, item 1) control device mayilluminate.2 1CAUTION!CAUTION!SYSTEM DAMAGEthrough frost.The system can freeze up if it is out of use,e.g. through a shut-down because offault(s).• You should drain the heating water viathe boiler drain at the lowest point in thesystem, to protect it against freezing, ifthe system remains switched off forseveral days because of a fault shutdown.SYSTEM DAMAGEthrough too frequent activation of the resetbutton.The burner ignition transformer may bedamaged, if you press the reset buttonmore than three times in succession, afterthe burner refuses to start.• Do not attempt to clear a fault morethan three times in succession by usingthe reset button.Fig. 3Item 1:Item 2:Burner fault indicationIndicator lampDisplay• Press the burner reset button (see burner operatinginstructions).See the technical burner documentation for informationregarding the resetting of the burner, if the burner will notstart after three attempts.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/200311

7System maintenance7 System maintenanceThis chapter explains, why regular maintenance isimportant for your system. It will also indicate to you,how you can check and regulate the water pressure.SYSTEM DAMAGECAUTION!through inadequate cleaning andmaintenance.• Have your system inspected, cleanedand maintained annually by a specialistcontractor.• We recommend you enter into acontract covering an annual inspectionand maintenance on an "as-requiredbasis".Observe the separate maintenance instructions formaintenance work on the neutralising system. Onlyspecialists should carry out work on the neutralisingsystem.7.1 Why is regular maintenanceimportant?You should have your system regularly serviced for thefollowing reasons:– to maintain the highest level of efficiency and tooperate the system economically (low fuelconsumption),– to achieve a high level of operational reliability,– to maintain the highest level of environmentallyresponsible combustion.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de12Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

System maintenance 77.2 Checking and correcting the water pressureYour heating system must contain sufficient water toensure the safe and correct function of your system.SYSTEM DAMAGEthrough frequent re-filling.CAUTION!The system may be damaged, dependingon water quality, by corrosion or scaling, ifyou frequently need to re-fill your systemwith make-up water.• Enquire from your local heatingcontractor whether you can use yourpublic water untreated or whether youneed to treat it before filling yoursystem.• Notify your local heating contractor ifyou need to regularly add make-upwater to your system.Fill make-up water into your system, if the systempressure is too low (see Chapter 3 "Using correct fill andmake-up water", page 7).7.2.1 When do you need to check the waterpressure in your heating system?– Recently filled in make-up water loses much of itsvolume in the first few days because it releasesgases. With new systems therefore check the waterpressure in your heating system initially on a dailybasis, and then after increasing intervals.USER NOTEAir pockets may form through the fill ormake-up water releasing gases.• Vent the system via the radiators and, ifrequired, replenish the system withmake-up water.– Check the water pressure monthly, if the heatingsystem still loses volume.We reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/200313

7System maintenanceSystems are generally designated as open or sealedsystems. Open systems are now rarely installed.Therefore, a sealed system is used as an example ofhow you can check the water pressure.The specialist will have carried out all initial settingsduring commissioning.7.2.2 Open systemsOn open systems the pressure gauge needle (Fig. 4,item 1) must be within the red range (Fig. 4, item 3).2137.2.3 Sealed systemsOn sealed systems the pressure gauge needle (Fig. 5,item 2) must be within the green range (Fig. 5, item 3).Set the red needle (Fig. 5, item 1) on the pressuregauge to the required system pressure.• Check the system water pressure.Fig. 4Item 1:Item 2:Item 3:Pressure gauge for open systemsPressure gauge needleGreen needleRed markingCAUTION!SYSTEM DAMAGEthrough frequent re-filling.The system may be damaged, dependingon water quality, by corrosion or scaling, ifyou frequently need to re-fill your systemwith make-up water.• Ensure that your heating system isadequately vented.213• Check the heating system for leaks andthe function of the expansion vessel.• The water pressure in the system is too low, if thepressure gauge needle falls below (Fig. 5, item 2)the green range (Fig. 5, item 3). Re-fill the heatingsystem with make-up water (see Chapter 3 "Usingcorrect fill and make-up water", page 7).• Fill make-up water through the fill cock in the heatingsystem pipework (return).• Vent the heating system.• Re-check the water pressure.Fig. 5Item 1:Item 2:Item 3:Pressure gauge for sealed systems (in bars)Red needlePressure gauge needleGreen markingWe reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de14Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003

NotesWe reserve the right to make any changes due to technical modifications. Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.deOperating instructions condensing gas boiler Logano plus SB735 • Issue 10/200315

Heating Contractor:PRODUCTS MANUFACTURED BYBBT Thermotechnik GmbH35573 Wetzlarwww.buderus.deBBT North America Corporation50 Wentworth AvenueLondonderry, NH 03053Tel: 603-552-1100 ● Fax: 603-584-1681www.buderus.netBBT North America Corporation reserves the right to make changes without noticedue to continuing engineering and technological advances.