Bosch 520-PN-L Specifications

INDOOR MODEL Flow Modulated with Hydro-generated Ignition520 HNWarning: If the information in this manual is not followed exactly, a fire or explosion

6 720 644 942 (2014/11) 520 HN10 | Appliance details3.4 Dimensions and installation clearancesFig. 3 Dimensions in Inches and (mm)[4] Heat exchanger

6 720 644 942 (2014/11)520 HNInstallation instructions | 11Fig. 4 Minimum clearances4 Installation instructions4.1 IntroductionPlease follow these i

6 720 644 942 (2014/11) 520 HN12 | Installation instructionsRemove cover and inspect.▶ Remove the flow control and power adjustment knobs.▶ Unscrew th

6 720 644 942 (2014/11)520 HNInstallation instructions | 13Fig. 8 Secure heater to wall4.4 Combustion air requirementsThe Protankless water heater h

6 720 644 942 (2014/11) 520 HN14 | Installation instructions4.5.1 Horizontal ventingAn AQ4 powervent, with a proof-of-draft safety interlock device, i

6 720 644 942 (2014/11)520 HNInstallation instructions | 15Fig. 10 Vent Adaptor for High Altitude InstallationsFreeze preventionIn cold climates, co

6 720 644 942 (2014/11) 520 HN16 | Installation instructionsFig. 12 Masonry chimney[1] Listed vent cap[2] Vent connector[3] Establish a one foot ris

6 720 644 942 (2014/11)520 HNInstallation instructions | 17GAS CONNECTIONS▶ Install a manual gas shut off valve, on the gas supply line.▶ Install a un

6 720 644 942 (2014/11) 520 HN18 | Installation instructionsGAS LINE SIZINGThe gas supply piping should be sized according to the applicable code for

6 720 644 942 (2014/11)520 HNInstallation instructions | 19FOR LP GASMaximum Capatity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gase

6 720 644 942 (2014/11) 520 HN2 | IndexIndex1 Key to symbols and safety instructions . . . . . . . . . . . . 31.1 Key to symbols . . . . . . . . .

6 720 644 942 (2014/11) 520 HN20 | Installation instructions4.7 Measuring gas pressureConnecting manometer▶ Shut off gas.▶ Remove front cover and loca

6 720 644 942 (2014/11)520 HNOperation instructions | 21Fig. 15 Plumbing connections and pressure relief valve4.9 Recirculation applicationSince rec

6 720 644 942 (2014/11) 520 HN22 | Operation instructions▶ The gas valve must be shut off by putting the ON/OFF switch to position OFF Wait five (5)

6 720 644 942 (2014/11)520 HNOperation instructions | 23Fig. 20 ▶ Turning the flow control knob clockwise restricts water flow. This provides higher

6 720 644 942 (2014/11) 520 HN24 | Maintenance and service▶ Empty the appliance of all water.Fig. 23 Draining[1] Retaining clip[2] Threaded bushing[

6 720 644 942 (2014/11)520 HNMaintenance and service | 25valve can result in decreased performance or water leaks in the heater.6.3 PilotInspecting pi

6 720 644 942 (2014/11) 520 HN26 | TroubleshootingFig. 24 7 Troubleshooting7.1 IntroductionMany of the questions customers ask regarding operation of

6 720 644 942 (2014/11)520 HNTroubleshooting | 27– With water flowing and heater sparking, apply flame from a match or lighter to the rear of the pilo

6 720 644 942 (2014/11) 520 HN28 | TroubleshootingFig. 25 Electrical wiring diagram[2] Spark electrode[3] Flame sensor[18] Microswitch[23] Ignition

6 720 644 942 (2014/11)520 HNTroubleshooting | 29(directly after the pressure tank on well systems) may be an effective way to maintain constant water

6 720 644 942 (2014/11)520 HNKey to symbols and safety instructions | 31 Key to symbols and safety instructions1.1 Key to symbolsWarningsThe following

6 720 644 942 (2014/11) 520 HN30 | Protecting the environment4.Be sure to run only one major fixture at a time with this water heater. Opening too man

6 720 644 942 (2014/11)520 HNInterior components and diagram parts list | 319 Interior components and diagram parts list9.1 Interior componentsFig. 26

6 720 644 942 (2014/11) 520 HN32 | Interior components and diagram parts list9.2 Components diagramFig. 27 Components Diagram12504010118672122423531

6 720 644 942 (2014/11)520 HNInterior components and diagram parts list | 339.3 Parts listItem Description Reference1 Front cover 8 738 708 4982 Shiel

6 720 644 942 (2014/11) 520 HN34 | LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEATERS10 LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS WATER HEA

6 720 644 942 (2014/11)520 HNInstaller Checklist to be completed by installer upon installation | 35CONSEQUENTIAL OR SIMILAR DAMAGES INCLUDING, WITHOU

6 720 644 942 (2014/11) 520 HN4 | Key to symbols and safety instructionsDanger from escaping flue gases▶ Ensure all vent pipes and chimneys are not da

6 720 644 942 (2014/11)520 HNKey to symbols and safety instructions | 5Flooding▶ After a flood, do not use the appliance if any part has been submerge

6 720 644 942 (2014/11) 520 HN6 | Warning2 WarningWARNING: Fire danger!▶ Keep appliance area clear and free from combustible materials, gasoline and o

6 720 644 942 (2014/11)520 HNAppliance details | 7Fig. 1 3 Appliance details3.1 520 HN specifications (Technical data)Approved in US/Canada Capacity5

6 720 644 942 (2014/11) 520 HN8 | Appliance details3.2 Unpacking the 520 HN heaterBefore installing the unit, be certain you have the correct heater f

6 720 644 942 (2014/11)520 HNAppliance details | 93. The appliance must be isolated from the gas supply piping system by closing its individual manual