Bosch 520-HN-N Specifications

MODEL GWH 1600 HINDOOR MODELHydro-generated ignitionSuitable for heating potable water onlyNot approved for space heating or preheated water applicati

6 720 608 03210Installation instructionsMasonry chimneyMasonry chimneys shall be built and installed inaccordance with NFPS 211 or local codes.

6 720 608 032Installation instructions113.7 Gas piping & connectionsBefore connecting the gas supply, check the ratingplate on the right si

6 720 608 03212Installation instructionsFOR NATURAL GASMaximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and

6 720 608 032Installation instructions133.8 Measuring gas pressureConnecting manometerB Shut off gas.B Remove front cover and locate inlet gas

6 720 608 03214Operation instructions3.10 Recirculation applicationSince recirculation through the heater is notpermissible, the following drawi

6 720 608 032Operation instructions154.2 Lighting instructionsB 1. STOP! Read the previous safety information.B 2. The gas valve must be shut off by p

6 720 608 03216Operation instructions4.4 Setting the water temperatureThe GWH 1600 H has a gas control that modulatesburner input in respons

6 720 608 032Maintenance and service175 Maintenance and service5.1 Maintenance intervalsThe GWH 1600 H requires periodic maintenance. Thebelow time ma

6 720 608 03218Maintenance and service5.4 Main burnersThe main burner flames should be blue, with a moreintense blue cone in the center

6 720 608 032Troubleshooting196 Troubleshooting6.1 IntroductionMany of the questions customers ask regardingoperation of this unit can be answer

6 720 608 0322IndexIndex1 Warning 22 Appliance details 32.1 GWH 1600 H specifications (Technical data) 32.2 Unpacking the GWH 1600 H heater 42.3 G

6 720 608 03220Troubleshooting• 5. Confirm wire connection to the pilot electro valveis secure. See Components Diagram for location.Inspect ter

6 720 608 032Troubleshooting21• 4. Hot water is very hot out of the tap, requiring a lotof cold water to be added with it in order to attain auseable

6 720 608 03222Troubleshooting• 3. Inlet water is preheated. This model does not havea thermostat and will not modulate flame height inorder to

6 720 608 032Protecting the environment23in the water path can slow water flow through theheat exchanger causing it to boil and make noise• 3.

6 720 608 03224Interior components and diagram parts list8 Interior components and diagram parts list8.1 Interior componentsFig. 26 Functional scheme4

6 720 608 032Interior components and diagram parts list258.2 Components diagramFig. 27 Components Diagram403832201915121014131116171886721222324252627

6 720 608 03226Interior components and diagram parts list8.3 Parts listItem Description Reference1 Front cover 8 705 431 242 02 Shield 8 705 506 814 0

6 720 608 032Twelve Year Limited Warranty279 Twelve Year Limited WarrantyGeneralAquastar water heaters are warranted by theManufacturer (BOSCH)

Recycled paper © 2006 BBT NORTH AMERICA CORPORATION, Waitsfield, VT all rights reservedInstaller Checklist, to be performed by installer upon installa

6 720 608 032Appliance details32 Appliance details2.1 GWH 1600 H specifications (Technical data)Approved in US/CanadaCapacityGWH 1600 H: 4.36 GPMMaxim

6 720 608 0324Appliance details2.2 Unpacking the GWH 1600 H heaterThis heater is packed securely.Before installing the unit, be certain you have theco

6 720 608 032Appliance details52.4 Dimensions and installation clearancesFig. 3 Dimensions in Inches and (mm)4 Heat exchanger5 Burner10 Temperature co

6 720 608 0326Installation instructions3 Installation instructions3.1 IntroductionPlease follow these instructions. Failure to followinstruction

6 720 608 032Installation instructions73.4 Mounting HeaterRemove cover and inspect.B Remove the temperature control.B Remove the outer case by pu

6 720 608 0328Installation instructions3.5 Combustion air requirementsThe AquaStar water heater holds cold water in itscopper heat exchanger a

6 720 608 032Installation instructions9B All gas vent sections must be secured to each otherwith sheet metal screws and be properly supported.Horizont