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Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual Bosch Thermotechnology Corporation

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

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Installer Checklist, to be performed by installer upon installation

Installer Checklist, to be performed by installer upon installation

Serial Number	___ ___ ___ ___ ___ ___ ___ ___
	(8 digit serial number is located on rating plate on right side panel)
Gas Pressure reading*	Static__________	Operating__________
CO2 reading	__________
Air restrictor size	__________
Building Water Pressure	__________ Range if on Well system __________
Installing Company	_____________________________________________
Installer name	_____________________________________________
Address	_____________________________________________
Phone	_____________________________________________

* See Chapter 3.8 and gas pressure table (to be filled out by installer)

Installation manual should be left with the owner after the installation is tested and completed

BOSCH THERMOTECHNOLOGY CORPORATION

50 Wentworth Avenue Londonderry, NH 03053 Tel. 866-330-2730 www.boschpro.com

Bosch Termotecnologia SA

Estrada de Cacia

3801 - 856 Aveiro - PORTUGAL

Recycled paper	© 2008 Bosch Thermotechnology Corp.,
	Londonderry, NH

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Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N Installer Checklist, to be performed by installer upon installation

Contents

Temperature Modulated with Electronic Ignition Suitable for heating and recirculating potable waterWhat to do if you smell gas GWH 345/450 ESRFor your safety Index1 Warning 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 2.1 Features 2.2 GWH-345/450-ESR Specifications Technical dataTemperature Control DimensionsFig. 3 Service position to access water and electric connections 2.3 Unpacking the GWH-345/450-ESR heaterWater resistant Inlet air restrictors2.4 General rules to follow for safe operation Appliance details2.5 Dimensions and minimum installation clearances Fig. 4 DimensionsFig. 5 Minimum clearances Table 1 Minimum clearancesFig. 7 Service position to access water and electric connections 2.6 ApplicationsIntroduction Pump SizingTable 2 Venting Specifications pressureInlet water flow rate3 Installation instructions 3.2 Proper location for installing your heater3.3 Heater placement and clearances 3.4 Mounting installation3.5 Combustion air requirements Fig. 10 Mounting the heaterTwin pipe Single pipeInstallation instructions Appliances located in confined spaces1000 Btu/hr 292.81 watts if all air is taken from inside the building 3.6.1 Vent material and specifications Table 3 Venting Specifications3.6 Venting Vent lengthsVent Safety System Fig. 13 Maximum vent and combustion air lengthsVent material Table 4 Vent manufacturer contact informationFig. 14 Exhaust vent connection Installation instructionsSelecting inlet air restrictor ExhaustIntake Table 6 Determining equivalent vent length see example in TableFig. 16 Exhaust air inlet accessory Table 8 Restrictors tableCombustion air inlet connection Fig. 15 Mounting sequenceFig. 17 Required condensate drain installation 3.6.4 Room sealed installation Twin pipe3.6.3 Condensate drain requirements Fig. 18 Horizontal twin pipe termination3.6.5 Vertical terminations Horizontal runsVent terminations Fig. 20 Vertical vent termination clearances3.6.6.1Requirements for installation in Massachusetts Attention residents of the Commonwealth of MassachusettsInstallation instructions 248 CMR 5.082a1 throughRecommended exhaust vent terminator position Installation instructionsDescription Minimum distance3.6.7 Exhaust vent configuration examples Fig. 22 Horizontal side wall venting installationFig. 23 Vertical venting installation - Masonry Chimney Fig. 24 Vertical venting installationGAS CONNECTIONS 3.7 Gas piping & connectionsInstallation instructions FOR NATURAL GAS FOR LP GASInstallation instructions Maximum Capacity of Semi-Rigid flexible, nonConnecting manometer 3.8 Measuring gas pressure3.9 Checking restrictor plate size by measuring CO2 level value Fig. 27 Gas pressure measuring lower tapping3.10 Water connections 3.11 Electrical connectionsFig. 30 Plumbing Connections and Pressure Relief Valve Installation instructions4.2 For your safety read before operating your water heater 4 Operating instructions4.1 Initial filling instructions 4.3 Startup instructions4.4 Power 4.5 Recirculating water temperature4.6 Temperature and hot water flow Fig. 33 Recirculating water temperature adjustmentFig. 35 Electrical scheme 4.8 Electrical diagramOperating instructions 5 Maintenance and service 5.1 Service modeMaintenance and service Yearly maintenanceExiting service mode ModeParameter ValuesTroubleshooting TroubleshootingFault Indication Possible CauseTroubleshooting Fault IndicationPossible Cause CheckGWH-345/450-ESR Functional scheme 7 GWH-345/450-ESR Functional schemeFunctional scheme 8 Interior components diagram and parts list Interior components diagram and parts list8.1 Interior components Fig. 37 ComponentsFig. 38 Components Diagram 8.2 Components diagramInterior components diagram and parts list 8.3 Parts list Interior components diagram and parts listDescription Reference9 Protecting the environment Protecting the environmentPacking Components10 Ten Year Limited Warranty Ten Year Limited WarrantyService Labor Costs How to Make a ClaimInstaller Checklist, to be performed by installer upon installation BOSCH THERMOTECHNOLOGY CORPORATION