Bosch GWH-345/450-ESR-L - Manuals

6 720 607 909 Appliance details 5 Water resistant IP X4 (protection against water drops) 2.3 Unpacking the GWH-345/450-ESR heater This heater is packed securely. The box includes: • Wall-mounted gas fired recirculating water heater • Bracket and screws for wall hanging the heater • Exhaust vent adap...

6 720 607 909 Appliance details 7 2.5 Dimensions and minimum installation clearances Fig. 4 Dimensions 1 Combustion air inlet adapter (right side only) 2 Exhaust adapter with CO 2 measuring point 3 Front cover 4 On/Off button 5 Reset button 6 Recirculating water temperature selector 7 LED - (ON) war...

6 720 607 909 8 Appliance details 2.6 Applications 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 professio...

6 720 607 909 Appliance details 9 Pressure drop curves Note : Flow above 6 GPM is not permitted. Fig. 8 GWH 345 ESR Fig. 9 GWH 450 ESR 2.7 Water quality Water quality can have an impact on appliance performance and appliance longevity, and may not be covered by the manufacturer's warranty.For water ...

6 720 607 909 10 Installation instructions 3 Installation instructions 3.1 Introduction Please follow these instructions. Failure to followinstructions may result in: • Property damage or personal injury • Improper operation • Heater damage • Loss of warranty. Please contact Bosch Water Heating with...

6 720 607 909 Installation instructions 11 Fig. 10 Mounting the heater 3.5 Combustion air requirements Twin pipe The GWH-345/450-ESR is designed as a sealedcombustion appliance. It is recommended that thecombustion air be provided by a dedicated 3” pipe tothe outside. If terminating combustion air p...

6 720 607 909 12 Installation instructions • Appliances located in confined spaces: The confined space must be provided with two per-manent openings, one commencing within 12 inches (304.8mm) of the top and one commencing within 12 inches (304.8mm) of the bottom of the enclosure. Each opening must h...

6 720 607 909 Installation instructions 13 3.6 Venting 3.6.1 Vent material and specifications Establish vent clearances that comply with the vent manufacturer's specifications. In all cases follow local codes. Note: Listed thimbles or collars are necessary to pass through wall and ceiling partitions...

6 720 607 909 14 Installation instructions Fig. 13 Maximum vent and combustion air lengths Vent material The GWH-345/450-ESR requires 3 inch sealed single wall stainless steel vent pipe (AL29-4C). Use of any other vent material will void the manufactures warranty and may result in a hazardous condit...

6 720 607 909 Installation instructions 15 Fig. 14 Exhaust vent connection

6 720 607 909 Installation instructions 17 Use table below to define which restrictor to be used. After installation is complete, check CO 2 levels per chapter 3.9. Combustion air inlet connection The combustion air inlet accessory can only be connected to the top right of the appliance. The left si...

6 720 607 909 18 Installation instructions 3.6.3 Condensate drain requirements An external condensate drain must always be installed except when using one 90° elbow and less than 3 feet of horizontal pipe. Note: condensate must be disposed of according to local codes. 1. Install condensate drain as ...

6 720 607 909 Installation instructions 21 Recommended exhaust vent terminator position Fig. 21 * Subject to local codes and anticipated snow level ** Other equipment that operates with a mechanical air inlet may require greater distances, reference manufacturer's instructions NOTICE : Exhaust and a...

6 720 607 909 22 Installation instructions 3.6.7 Exhaust vent configuration examples Fig. 22 Horizontal side wall venting installation Fig. 23 Vertical venting installation - Masonry Chimney Fig. 24 Vertical venting installation NOTE: If appliance uses room air, do not place any other combustion app...

6 720 607 909 Installation instructions 23 3.7 Gas piping & connections Before connecting the gas supply, check the ratingplate on the right side of the heater to be sure that theheater is rated for the same gas to which it will beconnected.In the United States: The installation must conform wit...

6 720 607 909 24 Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure dropof 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Fig. 26 Follow boxed numb...

6 720 607 909 Installation instructions 25 3.8 Measuring gas pressure Connecting manometer B Turn power off. B Shut off gas supply. B Remove front cover and locate the inlet gasmeasuring point (see Fig. 27). B Loosen screw inside test point fitting (do not remove)and connect manometer tube on test p...

6 720 607 909 26 Installation instructions B If the CO 2 content is too high, use the next smallest restrictor. B After replacing the restrictor, measure CO 2 level again. Repeat procedure until correct level is obtained. B Once correct reading is obtained, replace screw with gasket in exhaust colla...

6 720 607 909 Operating instructions 27 4 Operating instructions 4.1 Initial filling instructions Before proceeding with the operation of the heater make sure that the system is filled with water: B Turn off power supply to heater. B Open the cold water inlet supply to the heater fully. B Open a hot...

6 720 607 909 28 Operating instructions 4.4 Power On To start the appliance: B press the ON/OFF button. LED (fig. 31) goes orange.When the burner is working, the LCD display shows the symbol . Fig. 32 Off To shut down the appliance: B press the ON/OFF switch to OFF position. 4.5 Recirculating water ...

6 720 607 909 Operating instructions 29 4.8 Electrical diagram Fig. 35 Electrical scheme 10 Flame sensor 11 Ignitor electrode 12 Gas valve 13 Junction box (wiring of tank pump) 14 Fan 15 Temperature limiter / ECO 16 Differential pressure switch 17 TT connection - under low voltage cover plastic 18 D...

6 720 607 909 30 Maintenance and service 5 Maintenance and service The unit should be checked once a year by a gastechnician. If repairs are needed, the repairs should bedone by a gas technician To remove front cover B Loosen the two Philips head screws (as shown inFig. 2). B Pull control panel upwa...

6 720 607 909 32 Troubleshooting 6 Troubleshooting Fault Indication Possible Cause Check E9 Shut down by the temperature limiter(over temperature). • 1. Check position of heating NTC • 2. Check temperature limiter, cables • 3. Check system with air, air vent • 4. Bleed air from system. EA No Flame d...

6 720 607 909 34 GWH-345/450-ESR Functional scheme 7 GWH-345/450-ESR Functional scheme Fig. 36 Functional scheme APS - Air Pressure Switch

6 720 607 909 Interior components diagram and parts list 35 8 Interior components diagram and parts list 8.1 Interior components Fig. 37 Components 1 Combustion air inlet adapter (right side only) 2 Exhaust adapter with CO 2 measuring point 3 Front cover 4 On/Off button 5 Reset button 6 Recirculatio...

6 720 607 909 36 Interior components diagram and parts list 8.2 Components diagram Fig. 38 Components Diagram

6 720 607 909 Interior components diagram and parts list 37 8.3 Parts list Item Description Reference GROUP 1 1 Front cover 8 705 431 223 2 Cover screw no. 10 x 22mm 2 910 612 435 3 Trade mark badge 8 701 103 140 4 Gasket 8 704 701 077 5 Support set 8 708 006 130 6 Grommet set 8 710 203 039 7 Deflec...

6 720 607 909 38 Protecting the environment 9 Protecting the environment Packing The packing box may be fully recycled as confirmed bythe recycling symbol . Components Many parts in the heater can be fully recycled in the endof the product life. Contact your city authorities forinformation about the...

6 720 607 909 Ten Year Limited Warranty 39 10 Ten Year Limited Warranty General BOSCH PRO water heaters are warranted by theManufacturer. Bosch Thermotechnology Corp. willfurnish a replacement heat exchanger and will furnish areplacement of any part which fails in normal use andservice within the ap...