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Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual GWH-345/450-ESR Functional scheme

Models: GWH-345/450-ESR-L GWH-345/450-ESR-N

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GWH-345/450-ESR Functional scheme

7GWH-345/450-ESR Functional scheme

	APS - Air Pressure Switch
Fig. 36	Functional scheme
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Page 34

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Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual GWH-345/450-ESR Functional scheme

Contents

What to do if you smell gas Temperature Modulated with Electronic IgnitionSuitable for heating and recirculating potable water GWH 345/450 ESR1 Warning For your safetyIndex IndexWarning The recirculating water heater must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0.5 psig 14” W.C Temperature Control 2.1 Features2.2 GWH-345/450-ESR Specifications Technical data DimensionsWater resistant Fig. 3 Service position to access water and electric connections2.3 Unpacking the GWH-345/450-ESR heater Inlet air restrictors2.4 General rules to follow for safe operation Appliance detailsFig. 5 Minimum clearances 2.5 Dimensions and minimum installation clearancesFig. 4 Dimensions Table 1 Minimum clearancesIntroduction Fig. 7 Service position to access water and electric connections2.6 Applications Pump SizingInlet Table 2 Venting Specificationspressure water flow rate3.3 Heater placement and clearances 3 Installation instructions3.2 Proper location for installing your heater 3.4 Mounting installationTwin pipe 3.5 Combustion air requirementsFig. 10 Mounting the heater Single pipeInstallation instructions Appliances located in confined spaces1000 Btu/hr 292.81 watts if all air is taken from inside the building 3.6 Venting 3.6.1 Vent material and specificationsTable 3 Venting Specifications Vent lengthsVent material Vent Safety SystemFig. 13 Maximum vent and combustion air lengths Table 4 Vent manufacturer contact informationFig. 14 Exhaust vent connection Installation instructionsIntake Selecting inlet air restrictorExhaust Table 6 Determining equivalent vent length see example in TableCombustion air inlet connection Fig. 16 Exhaust air inlet accessoryTable 8 Restrictors table Fig. 15 Mounting sequence3.6.3 Condensate drain requirements Fig. 17 Required condensate drain installation3.6.4 Room sealed installation Twin pipe Fig. 18 Horizontal twin pipe terminationVent terminations 3.6.5 Vertical terminationsHorizontal runs Fig. 20 Vertical vent termination clearancesInstallation instructions 3.6.6.1Requirements for installation in MassachusettsAttention residents of the Commonwealth of Massachusetts 248 CMR 5.082a1 throughDescription Recommended exhaust vent terminator positionInstallation instructions Minimum distanceFig. 23 Vertical venting installation - Masonry Chimney 3.6.7 Exhaust vent configuration examplesFig. 22 Horizontal side wall venting installation Fig. 24 Vertical venting installationGAS CONNECTIONS 3.7 Gas piping & connectionsInstallation instructions Installation instructions FOR NATURAL GASFOR LP GAS Maximum Capacity of Semi-Rigid flexible, non3.9 Checking restrictor plate size by measuring CO2 level value Connecting manometer3.8 Measuring gas pressure Fig. 27 Gas pressure measuring lower tappingFig. 30 Plumbing Connections and Pressure Relief Valve 3.10 Water connections3.11 Electrical connections Installation instructions4.1 Initial filling instructions 4.2 For your safety read before operating your water heater4 Operating instructions 4.3 Startup instructions4.6 Temperature and hot water flow 4.4 Power4.5 Recirculating water temperature Fig. 33 Recirculating water temperature adjustmentFig. 35 Electrical scheme 4.8 Electrical diagramOperating instructions Maintenance and service 5 Maintenance and service5.1 Service mode Yearly maintenanceParameter Exiting service modeMode ValuesFault Indication TroubleshootingTroubleshooting Possible CausePossible Cause TroubleshootingFault Indication CheckGWH-345/450-ESR Functional scheme 7 GWH-345/450-ESR Functional schemeFunctional scheme 8.1 Interior components 8 Interior components diagram and parts listInterior components diagram and parts list Fig. 37 ComponentsFig. 38 Components Diagram 8.2 Components diagramInterior components diagram and parts list Description 8.3 Parts listInterior components diagram and parts list ReferencePacking 9 Protecting the environmentProtecting the environment ComponentsService Labor Costs 10 Ten Year Limited WarrantyTen Year Limited Warranty How to Make a ClaimInstaller Checklist, to be performed by installer upon installation BOSCH THERMOTECHNOLOGY CORPORATION