Manuals / Bosch Appliances / Household Appliance / Water Heater

Bosch Appliances GWH-345/450-ESR-L Applications, Introduction, Pump Sizing, Appliance details

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

1 40

Download 40 pages 52.3 Kb

Page 8

Image 8

Appliance details

2.6Applications

Caution: the water heater which will be used to supply potable water shall not be connected to any heating system or component(s) previously used with a nonpotable water heating appliance.

Introduction

The application designs provided in this manual are general guides to be used when installing this recirculating water heater.

Pump Sizing

Required PS pumps are Taco 007 Bronze or Grundfos 15-42B. PZ pumps should be sized by a professional plumb- ing contractor based on the specific application.

Caution: Do not overpump the heater. Maximum 5 gpm water flow permitted through the heater.

Instantaneous water heater (direct tank load design)

Note: maximum amp draw: 1,5A. Do not connect additional pump to the appliance but use a relay panel if powering multiple pumps.

Fig. 6

Front cover

Low voltage access cover

Control panel

Fig. 7 Service position to access water and electric connections

8	6 720 607 909

Page 8

Image 8

Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual Applications, Introduction, Pump Sizing, Appliance details

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 pipe1000 Btu/hr 292.81 watts if all air is taken from inside the building Appliances located in confined spacesInstallation instructions 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 installationInstallation instructions 3.7 Gas piping & connectionsGAS CONNECTIONS 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 adjustmentOperating instructions 4.8 Electrical diagramFig. 35 Electrical scheme 5 Maintenance and service 5.1 Service modeMaintenance and service Yearly maintenanceExiting service mode ModeParameter ValuesTroubleshooting TroubleshootingFault Indication Possible CauseTroubleshooting Fault IndicationPossible Cause CheckFunctional scheme 7 GWH-345/450-ESR Functional schemeGWH-345/450-ESR Functional scheme 8 Interior components diagram and parts list Interior components diagram and parts list8.1 Interior components Fig. 37 ComponentsInterior components diagram and parts list 8.2 Components diagramFig. 38 Components Diagram 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