Bosch C950ES Specifications

C 950 ESINDOOR MODELTemperature Modulated with Electronic IgnitionSuitable for heating potable water and space heating(Intended for variable flow appl

6 720 646 81210Installation instructions3 Installation instructions3.1 Specialized toolsThe following specialized tools may be required for installati

6 720 646 812Installation instructions11Fig. 8 Concentric vent kit example3.3.2 Vent specificationsEstablish vent clearances that comply with th

6 720 646 81212Installation instructionsMaximum combustion air and exhaust pipe lengthThe following tables display the maximum allowablestraight

6 720 646 812Installation instructions13Calculation example for 3" venting:ExhaustCombustion airCalculation example for 4" venting:ExhaustCo

6 720 646 81214Installation instructionsRequired direct vent terminal clearances (twin pipe / concentric penetration)Fig. 9* For clearances not specif

6 720 646 812Installation instructions15Required other than direct vent terminal clearances (single pipe penetration)Fig. 10* For clearances not speci

6 720 646 81216Installation instructions3.3.3 Vent configuration examplesBelow are approved examples of vertical and horizontal venting installations.

6 720 646 812Installation instructions17Fig. 15 Horizontal venting system (single pipe pene-tration)*Warning: Single pipe penetration should be used i

6 720 646 81218Installation instructionsAppliance condensate drain installationThe appliance comes equipped with an internalcondensate drain and

6 720 646 812Installation instructions19Backdraft reducerThe Heat Fab backdraft reducer (9301BFP) is the pre-ferred option for limiting backdraft (see

6 720 646 8122IndexIndex1 Warning 32 Appliance details 52.1 Features 52.2 Specifications (Technical data) 52.3 Unpacking the heater 62.4 General

6 720 646 81220Installation instructions3.3.7 Fan speed adjustment! IMPORTANT INFORMATION:Natural gas heaters with installation altitudesbelow 2

6 720 646 812Installation instructions21Natural GasLiquid propaneAltitude (above sea level)Vent terminalTotal equivalent vent length1)Minimum power fa

6 720 646 81222Installation instructionsAdjusting minimum power fan speed (P2)To select fan speed:B Press ON/OFF button into OFF.B Press and hold

6 720 646 812Installation instructions23Attention residents of the Commonwealth of Massachusetts:In the Commonwealth of Massachusetts the followingreg

6 720 646 81224Installation instructions3.4 Combustion air requirementsTwin pipe and Concentric pipeThe water heater is designed as a sealed combustio

6 720 646 812Installation instructions253.5 Proper location for installing your heaterCarefully select the location of the water heater. Foryo

6 720 646 81226Installation instructionsFig. 27 Leveling wall mounting bracketFig. 28 Mounting the heater3.8Gas piping & connections Before conne

6 720 646 812Installation instructions27Fig. 29 Gas connectionOnce connections are made, check for gas leaks at all joints. Apply some gas leak detect

6 720 646 81228Installation instructionsFOR NATURAL GASMaximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and

6 720 646 812Installation instructions293.9 Water connections B When facing the heater, the ¾” cold connection is on the bottom right and the hot conn

6 720 646 812Warning31 WarningFor your safetyDo not store or use gasoline or other flammable,combustible or corrosive vapors and liquids

6 720 646 81230Installation instructionsConnecting the pressure relief valve (PRV)A listed pressure relief valve must be installed at thetime

6 720 646 812Installation instructions313.11 Filling the condensate trapThe condensate trap can be filled before or afterconnecting the vent p

6 720 646 81232Installation instructions3.12 Domestic hot water recirculationAlthough recirculation directly through the tanklesswater heater i

6 720 646 812Installation instructions333.13 Space heating applicationsBosch tankless water heaters are approved for use incombination DHW and spac

6 720 646 81234Installation instructionsFig. 42 Space heating diagram1 Hot water outlet2 Cold water inlet3 Pressure relief valve4 Gas supply5 Shut off

6 720 646 812Installation instructions353.14 Measuring gas pressureConfirm gas pressure upon installation.Connecting manometerB Shut off gas supply at

6 720 646 81236Electrical connections4 Electrical connections4.1 Electrical power supplyThe water heater requires an electrical power supplyfro

6 720 646 812Operation instructions375 Operation instructionsFig. 481 On/Off button2 Reset button3 Program Key4 LCD display5 Up button6 Down button7 P

6 720 646 81238Operation instructions5.2 For your safety read before operating your water heaterA. This appliance is equipped with electronic ignition

6 720 646 812Operation instructions39Solar modeThe water heater will not ignite if inlet water temperatureexceeds the set temperature on the applia

6 720 646 8124WarningFCC:This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may

6 720 646 81240Operation instructions5.8 Program buttonFig. 63 “Program” key5.8.1 Memorizing selected temperatureB Press buttons or to select

6 720 646 812Maintenance and service416 Maintenance and service6.1 Annual maintenance(To remove front cover, see page 7.)Venting System• Venting syste

6 720 646 81242Maintenance and service5. Disconnect inlet and outlet water pipes from thewater heater. Place a small bucket underneath t

6 720 646 812Maintenance and service43B Remove the condensing heat exchanger unit fromthe appliance by pulling it towards you.B Dismantle all pa

6 720 646 81244Maintenance and serviceNote: When making adjustments, make surecombustion cover is installed.C. Adjusting CO2:Note: P1 adjustment

6 720 646 812Maintenance and service456.6 Program valuesThis section describes details on programming the appliance. For most applications the factory

6 720 646 81246Maintenance and service6.7 Control board diagnostics1. Press ON/OFF button to turn off the appliance.2. Press and hold "Program

6 720 646 812Troubleshooting477 Troubleshooting7.1 IntroductionMany of the questions customers ask regarding operationof this unit can be answere

6 720 646 81248Troubleshootingand check all taps for water flow. There should be nowater flowing. Any continuous flow of water, small orlarge, indic

6 720 646 812Problem solving498 Problem solving8.1 Error code diagnosticsiTo remove error code from thedisplay, press the reset button.Display Ca

6 720 646 812Appliance details52 Appliance details2.1 FeaturesParts• Key Pad interface control• High power pre-mix compact burner with low NOxem

6 720 646 81250Problem solvingPrimary fan rotation too low inoperation.1. Disconnect power supply cord and check wire connection onback side of f

6 720 646 812Problem solving51Exhaust temperature sensor - theappliance will close the burner andlock if it gets over 194°F; (onlyapplied fo

6 720 646 81252Problem solvingIonization failure during operation. 1. Check gas type, Fig. 2, page 6.2. Check three wire connections to ignition

6 720 646 812Electrical diagram539 Electrical diagramFig. 72 Electrical scheme1 Intlet water temperature sensor2 Outlet water temperature sensor3 Back

6 720 646 81254Sensor resistance charts10 Sensor resistance chartsFig. 73Fig. 74Outlet NTC characteristics3 23 74 24 752576 26 772778 28 79 29 710 210

6 720 646 812Sensor resistance charts55Fig. 75Back Flow and Exhaust NTC characteristics3 23 74 24 75 25 76 26 77 27 78 28 79 29 710 210 711211712 212

6 720 646 81256Functional scheme11 Functional schemeFig. 76 Functional scheme

6 720 646 812Interior components diagram and parts list5712 Interior components diagram and parts list12.1 Interior componentsFig. 77 Components1 Exha

6 720 646 81258Interior components diagram and parts listFig. 78 Appliance overview

6 720 646 812Interior components diagram and parts list5912.2 Components diagram12.2.1 Group 1Fig. 79 Components Diagram998512367910129141617111315154

6 720 646 8126Appliance details• CO ≤ 290 ppm (measured)• CO2 level set from factory, see chapter 6.5, page 43.Dimensions• Depth (in): 11¼” (286 mm)•

6 720 646 81260Interior components diagram and parts list12.2.2 Group 2Fig. 80 Components Diagram12302513152014567328910881111812142122131817161613191

6 720 646 812Interior components diagram and parts list61Item Description Reference1 Heat exchanger (LP Gas) 8 705 406 4211Heat exchanger (Natural Gas

6 720 646 81262Interior components diagram and parts list12.2.3 Group 3Fig. 81 Components Diagram151413467821291113161756720902975.AA JFItem Descripti

6 720 646 812Interior components diagram and parts list6312.2.4 Group 4Fig. 82 Components Diagram9214134567811111213106720902976.AA JFItem Description

6 720 646 81264Interior components diagram and parts list12.2.5 Group 5Fig. 83 Components Diagram91112131012344567891114151617126720902977.AA JF(optio

6 720 646 812Interior components diagram and parts list6512.2.6 Group 6Fig. 84 Components Diagram376951041215131614126720608158-75.2V11Item Descriptio

6 720 646 81266Protecting the environment13 Protecting the environment PackingThe packing box may be fully recycled as confirmed bythe recycling symbo

6 720 646 812LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERS6714 LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERSMODELS C

6 720 646 81268LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERSLIMITED WARRANTYOTHER THAN THE OBLIGATIONS OF BTC EXPRESSLY SET FORTH HER

6 720 646 812Notes6915 Notes

6 720 646 812Appliance details7To remove front coverB Loosen the two Phillips head screws located onbottom rear of cover (see Fig. 3).Fig. 3 Lo

6 720 646 81270Notes

6 720 646 812Notes71

Replacement Parts available from:Bosch Termotecnologia SAEstrada de Cacia3800 - 533 Cacia - PORTUGAL© 2011 Bosch Thermotechnology Corp.,Londonderry, N

6 720 646 8128Appliance details2.4 General rules to follow for safe operationB 1. You must follow these instructions when youinstall your hea

6 720 646 812Appliance details92.5 Dimensions and minimum installation clearancesFig. 6 Dimensions1 On/Off button2 Reset button3 Program key4 Power ON