Instruction/ maintenance manual of the product GWH-345/450-ESR-N Bosch Appliances
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GWH 345/450 ESR T emperat ure Modulated wit h Elec t ronic Ignition Suit able for heat ing and rec irc ulat ing pot able wat er GWH-345/450-ESR-N - Natural Gas GWH-345/450-ESR-L - Liquefied Petroleum (LP) Gas 6 720 607 909 US (2008.
6 720 607 909 2 Index Index 1W a r n i n g 2 2 Appliance details 4 2.1 Features 4 2.2 GWH-345/450-ESR Spec ifications (Technical data) 4 2.3 Unpacking the GWH-345 /450-ESR heater 5 2.4 General rules to follow for safe o peration 6 2.5 Dimensions and minimum instal lation clearances 7 2.
6 720 607 909 Warning 3 FCC: This device complies with Part 15 of the FCC ru les. Operation is subj ect to the following two con ditions: (1) This device may not cause h armful interference, and (2) this device must acc ept any interference received, including interferenc e that may cause un desired operation.
6 720 607 909 4 Appliance details 2 Appliance details 2.1 Features Parts • Sealed combustion burner. Safety • Ionization flame sensor • Over temperature protection. High quality material s for long working life • Copper heat exchanger • C o m p a c t s p a c e s a v e r : m o u n t s o n a w a l l w i t h supplied bracket.
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.
6 720 607 909 6 Appliance details 2.4 General rules to follow for safe operation 1. You must follow these i nstructions when you install your heater. In the United States: Th e installation must conform with local codes or, in the absen ce of local codes, the National Fuel Gas Code ANSI Z223.
6 720 607 909 Appliance details 7 2.5 Dimensions and minimum installation clearances Fig. 4 Di mensions 1 Combustion air inlet ad apter (right side only ) 2 Exhaust adapter with CO 2 measuring point 3.
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 installi ng this recirculating water heater. Pump Sizing Required PS pumps are Taco 007 Br onze or Grundfos 15-42B.
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 ap pli ance longevity, and may not be covered by the manufacturer's warranty.
6 720 607 909 10 Installation instructions 3 Installation instructions 3.1 Introduction Please follow these instru ctions. Failure to follow instructions may result in: • Property damage or personal injury •I m p r o p e r o p e r a t i o n • Heater damage • Loss of warranty.
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 sealed combustion appliance. It is recommended that the combustion air be provided by a dedicat ed 3” pipe to the outside.
6 720 607 909 12 Installation instructions • Appliances located in confined spaces: The confined space must be provided with two per- manent openings, one commencin g within 12 inches (304.8mm) of th e top and one commen cing within 12 inches (304.8mm) of the bottom of the enclos ure.
6 720 607 909 Installation instructions 13 3.6 Venting 3.6.1 Vent material and specifications Establish vent clearances th at comply with the vent manufacturer's specifications. In all cases follow local codes. Note: Listed thimbles or collars are ne cessary to pass through wall and ceili ng partitions.
6 720 607 909 14 Installation instructions Fig. 13 Maximum vent an d 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 vo id the manufactures warranty and may result in a hazardous condition.
6 720 607 909 Installation instructions 15 Fig. 14 Exhaust ven t connection.
6 720 607 909 16 Installation instructions Selecting inlet air restrictor Note: Before installing the combustion air inlet accessory, the appropriate inlet air restrictor must be determined using Tables 6 , 7 and 8 . Refer to Fig. 15 for mounting sequence .
6 720 607 909 Installation instructions 17 Use table below to define which restrict or 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.
6 720 607 909 18 Installation instructions 3.6.3 C ondensate drain requirements An external condensate drain must always be in stalled except when using one 90° elbow and less than 3 feet of horizontal pipe. Note: condensate must be dispos ed of according to local codes.
6 720 607 909 Installation instructions 19 3.6.5 Vertical terminations Horizontal runs Any gas vent section that is greater than 45 degrees from the vert ical is con sidered hori zontal. Hori zontal sections must slope upwards from heater at least ¼ inch for every foot of its horizontal length and be properly supported.
6 720 607 909 20 Installation instructions 3.6.6.1Requirements for i nstallation in Massachusetts Attention residents of the Comm onwealth of Massachusetts : In the Commonwealth of Massachusetts the f.
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 a.
6 720 607 909 22 Installation instructions 3.6.7 Exhaust vent configur ation examples Fig. 22 Horizontal side wall venting installation Fig. 23 Vertical venting i nstallation - Maso nry Chimney Fig.
6 720 607 909 Installation instructions 23 3.7 Gas piping & connections Before connecting the gas suppl y, check the rating plate on the right side of the heat er to be sure that the heater is rated for the same gas to whi ch it will be connected.
6 720 607 909 24 Installation instructions FOR NA TU RAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Sp ecific Gravity Gas) Btu num bers given in thousands.
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 gas measuring point (see Fig. 27). B Loosen screw inside test point fitti ng (do not remove) and connect manometer tube on test point.
6 720 607 909 26 Installation instructions B If the CO 2 content is to o high, use the next small est restrictor. B After replacing the restrictor, measure CO 2 level again. Repeat procedure unti l correct level is obtained. B Once correct reading is obtained, replace screw with gasket in exhaust collar.
6 720 607 909 Operating instructions 27 4 Operating instructions 4.1 Initial filling instructions Before proceeding with the operation of th e 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.
6 720 607 909 28 Operating instructions 4.4 Power On T o start the appliance: B press the ON /O FF button. LED (fig. 31) goes orange. When the burner is working, the LCD display shows the symbol . Fig. 32 Off T o shu t down the appliance: B press the ON /O FF switch to OF F position.
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 l.
6 720 607 909 30 Maintenance and service 5 Maintenance and service The unit should be checked once a year by a gas technician. If repairs are neede d, the repairs should be done by a gas technician To remove front cover B Loosen the two Philips head sc rews (as shown in Fig.
6 720 607 909 Maintenanc e and service 31 Parameter storage B Keep pressing the reset button for at least 2 seconds in order to record adjus tments. The digital display blinks with the symbol . Exiting servic e mode B Press ON/OFF button to turn appliance OFF and then back ON again.
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.
6 720 607 909 Troubleshooting 33 Error lock-out is indicated by the orange LCD blinking. An e rror lock-out is done for safety reasons. After fixing the problem, press the reset button to return t he heater to service. Only tank loading (no heating functio n).
6 720 607 909 34 GWH-345/450-ESR Functional scheme 7 GWH-345/450-ESR Functional scheme Fig. 36 Fun ctional 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 ad apter (right side only ) 2.
6 720 607 909 36 Interior components diagram and par ts 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 Descriptio n Referen ce GROUP 1 1 Front cover 8 705 431 223 2 Cover screw no .
6 720 607 909 38 Protecting the environment 9 Protecting the environment Packing The packing box may be ful ly recycled as confirmed by the recycling s ymbol . Components Many parts in the heate r can be fully re cycled in the end of the product life.
6 720 607 909 Ten Year Limited Warranty 39 10 Ten Year Limited Warranty General BOSCH PRO water heaters ar e warranted by the Manufacturer. Bosch Thermotechnology C orp.
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