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Bosch GWH 345 ESR-N Manual
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Bosch GWH 345 ESR-N Manual

Temperature modulated with electronic ignition suitable for heating recirculating potable water
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GWH 345/450 ESR
Temperature Modulated with Electronic Ignition
Suitable for heating recirculating potable water
GWH-345/450-ESR-N - Natural Gas
GWH-345/450-ESR-L - Liquefied Petroleum (LP) Gas
Warning: If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any other
appliance.
Improper
installation,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
adjustment,
alteration,
What to do if you smell gas
• Close gas valve. Open windows and doors, and
evacuate the building.
• Do not try to operate any appliance.
• Do not touch any electrical switch; do not use any
phone in your building
• Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

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Summary of Contents for Bosch GWH 345 ESR-N

  • Page 1 GWH 345/450 ESR Temperature Modulated with Electronic Ignition Suitable for heating recirculating potable water GWH-345/450-ESR-N - Natural Gas GWH-345/450-ESR-L - Liquefied Petroleum (LP) Gas Warning: If the information in this manual is not What to do if you smell gas followed exactly, a fire or explosion may result •...

  • Page 2: Table Of Contents

    Index Index Warning Warning For your safety Appliance details Do not store or use gasoline or other flammable, Features combustible or corrosive vapors and liquids in the GWH-345/450-ESR Specifications (Technical data) Unpacking the GWH-345/450-ESR heater vicinity of this or any other appliance. General rules to follow for safe operation Dimensions and minimum installation clearances Warning: Carefully plan where you...
  • Page 3 Warning Warning: The recirculating water Caution: Label all wires prior to heater must be disconnected from the disconnection when servicing controls. gas supply piping system during any Wiring errors can use improper and pressure testing of that system at test dangerous operation.

  • Page 4: Appliance Details

    • Failure codes for diagnostics and repair Combustion • Freeze prevention cycle. • NOx ≤ 100 ppm BOSCH is constantly improving its • CO ≤ 250 ppm products, therefore specifications are • CO level (see table 8 for correct restrictor subject to change without prior notice.
  • Page 5 Appliance details Water resistant To remove front cover IP X4 (protection against water drops) The front cover is secured with two screws to prevent unauthorized access. Unpacking the GWH-345/450-ESR Always secure the control panel and front cover with these screws. heater This heater is packed securely.
  • Page 6 Appliance details To remove combustion cover (service only) 4. You must vent your heater. See chapter 3.6 Venting. 5. The appliance and its gas connection must be leak B Open the four clips and remove the combustion tested before placing the appliance in operation. The cover.

  • Page 7: Dimensions And Minimum Installation Clearances

    Appliance details Dimensions and minimum installation clearances Fig. 5 Dimensions Combustion air inlet adapter (right side only) Exhaust adapter with CO measuring point Front cover On/Off button Reset button Recirculating water temperature selector LED - (ON) warning light (blinks when in error lock out) Domestic hot water temperature selector Mounting bracket Fig.
  • Page 8 Appliance details Applications 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.

  • Page 9: Water Quality

    For water analysis data call your local water department. If on a well system, have well water analyzed periodically. If water quality is exceeding one or more of the values specified below, Bosch recommends installing a water condi- tioner or softener.

  • Page 10: Installation Instructions

    • Heater damage combustible and non-combustible materials listed below. See also fig. 6. • Loss of warranty. Please contact Bosch Water Heating with any A. Top 12 inches (305 mm) questions. B. Front 4 inches (100 mm) C. Back 0 inches Proper location for installing your D.

  • Page 11: Combustion Air Requirements

    Installation instructions 90° elbow and 1.5 feet for each 45° elbow. Maximum number of elbows permitted is 4 (see Table 6). Single pipe Note: This appliance requires 6200 cubic feet of available combustion air, or a minimum of 775 square feet of space with an 8 foot ceiling to operate.
  • Page 12 Installation instructions The space must have two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per: •...
  • Page 13 3 feet. carbon monoxide poisoning could The use of a 90 degree elbow is result. Bosch Thermotechnology Corp. equivalent to 3 ft in vent length. will not be responsible for improperly The use of 45 degree elbow is installed appliances.
  • Page 14 Table 5 Approved vent termination and condensate 6720607909-14.3JS Fig. 14 Maximum vent and combustion air lengths drain part numbers (subject to change) Contact your Bosch supplier for stocked vent material. Vent material The GWH-345/450-ESR requires 3 inch sealed single Vent Safety System wall stainless steel vent pipe (AL29-4C).
  • Page 15 Installation instructions Selecting combustion air inlet restrictor Example Note: Before installing the combustion air inlet Exhaust accessory, the appropriate inlet air restrictor must • 10 - 3' straight sections be determined using Tables 6, 7 and 8. • 1 - 1' straight section Refer to Fig.
  • Page 16 Installation instructions Use table below to define which restrictor to be used. Combustion air inlet connection The combustion air inlet accessory can only be Total equivalent length (ft) Restrictor Ø connected to the top right of the appliance. The left side must remain sealed.
  • Page 17 Installation instructions 3.6.3 Condensate drain requirements 3.6.4 Room sealed installation (Twin pipe) An external condensate drain must always be installed Although it is permitted to draw combustion air from except when terminating horizontally with less than 3 inside, the recommended method is to provide feet of pipe.
  • Page 18 Installation instructions 3.6.5 Vertical terminations Exterior Masonry Chimney Refer to the National Fuel Gas Code and consult a local Caution: Failure install venting HVAC contractor. Not recommended in cold condensate drain may result in damage climates. not covered by the manufacturer's warranty.
  • Page 19 Installation instructions 3.6.6.1Requirements for installation in 4. INSPECTION. The state or local gas inspector of the Massachusetts side wall horizontally vented gas fueled equipment shall not approve the installation unless, upon inspection, the Attention residents of the Commonwealth of inspector observes carbon monoxide detectors and Massachusetts: signage installed in accordance with the provisions of In the Commonwealth of Massachusetts the following...
  • Page 20 Installation instructions Recommended exhaust vent terminator position Fig. 22 Ref. Description Minimum distance Directly below an opening; operable windows, doors and any non- 36 in (twin pipe installation) mechanical fresh air openings 48 in (single pipe installation) Below a gutter, sanitary pipework or eaves 24 in Below a gutter, sanitary pipework or eaves, protected by metal 12 in...
  • Page 21 Installation instructions F i x e C l o s 6720608836-18.1JF Fig. 23 Direct Vent Terminal Other than Direct Vent Clearances Terminal Clearances Canadian Canadian Ref. Description Instalations Instalations Instalations Instalations Clearance to permanently closed window Vertical clearance to ventilated soffit located above the terminal within a horizontal distance os 2 feet (61 cm) from the center line of the terminal...
  • Page 22 Installation instructions 3.6.7 Exhaust vent configuration examples RAIN CAP STORM COLLAR FLASHING FIRESTOP SUPPORT HANGER STRAPS 4" MIN. AIR SPACE CONDENSATE DRAIN ELBOW TO DRAIN - DISPOSE OF CONDENSATE ACCORDING TO LOCAL CODES HORIZONTAL RUN 1/4" RISE/FT FROM HEATER Fig. 24 Horizontal side wall venting installation APPLIANCE 6720607915-14.6JS Fig.

  • Page 23: Gas Piping & Connections

    Installation instructions Gas piping & connections Measure the length of gas supply line and use the tables in Fig. 28 or the gas line manufacturer’s sizing tables to Before connecting the gas supply, check the rating determine pipe diameter necessary plate on the right side of the heater to be sure that the accommodate the BTU demand of the unit.
  • Page 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 drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Follow boxed numbers for piping just one GWH-450-ESR (example: ¾”...
  • Page 25 Installation instructions Measuring gas pressure Static Gas Pressure Reading (see Chapter 3.8) Connecting manometer enter here: ___________________ B Turn power off. B Shut off gas supply. Operating Gas Pressure Reading (see Chapter 3.8) B Remove front cover and locate the inlet gas enter here: ___________________ measuring point (see Fig.

  • Page 26: Water Connections

    Installation instructions B Once correct reading is obtained, replace screw with Checking restrictor plate size by gasket in exhaust collar. measuring CO level value. B Press On/Off button to turn heater Off and exit B Remove brass flat head screw on the exhaust collar. Diagnostic Mode.

  • Page 27: Electrical Connections

    Installation instructions Connecting the pressure relief valve (PRV) The listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater. No reducing coupling or other restriction may be installed in the discharge line.

  • Page 28: Operating Instructions

    Operating instructions Operating instructions Initial filling instructions B Use only your hand to press the on/off control switch. Never use tools. Follow these instructions exactly. If Before proceeding with the operation of the heater control switch is jammed, close the gas supply and make sure that the system is filled with water: call a qualified service technician.

  • Page 29: Temperature And Hot Water Flow

    Operating instructions Power Temperature and hot water flow Choose one the following: • If using a tank mounted Aquastat, set temperature on To start the appliance: Aquastat control (left knob should be in maximum B press the ON/OFF button. position). LED (fig.

  • Page 30: Electrical Diagram

    Operating instructions Electrical diagram Fig. 38 Electrical scheme Flame sensor Domestic hot water temperature sensor (12kOhm only - Ignitor electrode under low voltage cover plastic) Gas valve Junction box (wiring of tank pump) Fuse (3.15) NOTICE: Except for the fuse, there are no serviceable Temperature limiter / ECO parts inside the electronics.

  • Page 31: Maintenance And Service

    Maintenance and service Maintenance and service Adjusting parameters Warning: Always turn off the electrical B Rotate hot water temperature selector dial power supply, turn off the manual gas change the value of the parameter (only parameter valve and turn off the manual water shut 03 and 22).
  • Page 32 Maintenance and service Mode Parameter Values Not used ---------- (displayed values have no relevance) Not used ---------- (displayed values have no relevance) Error code history Displays the last 8 error codes. Use the hot water temperature selector (right dial) to toggle from newest (left) to oldest (right) error codes. Outlet water temperature Displays the real-time outlet temperature as detected by the outlet temperature sensor.

  • Page 33: Altitude Adjustments

    Altitude adjustments If the appliance is not powered off and then back on again, it returns to normal working conditions after 5 minutes. Altitude adjustments Above 4,000 feet, adjustment of air restrictor might be required. B Install air restrictors according to tables 6, 7 and 8. To reduce the natural derate, increase the gas manifold pressure and then check to ensure the CO is within...

  • Page 34: Troubleshooting

    Troubleshooting Troubleshooting Fault Indication Possible Cause Check Shut down by the temperature limiter • 1. Check position of outlet water (over 220°F temperature). sensor. Ensure that sensor is firmly attached to outlet pipe • 2. Check temperature limiter, cables and connections •...
  • Page 35 Troubleshooting Fault Indication Possible Cause Check Flow reduced • 1. Check heat exchanger - flush or descale if necessary LED or LCD of the appliance doesn't voltage supply, fuse blown, • 1. Check voltage supply start up, no function. transformer etc. defect •...

  • Page 36: Gwh-345/450-Esr Functional Scheme

    GWH-345/450-ESR Functional scheme GWH-345/450-ESR Functional scheme APS - Air Pressure Switch Fig. 39 Functional scheme 6 720 607 909...
  • Page 37 Interior components diagram and parts list Interior components diagram and parts list Interior components Fig. 40 Components Combustion air inlet adapter (right side only) Exhaust adapter with CO measuring point Front cover On/Off button Reset button Recirculation water temperature selector LED - (ON) warning light (blinks when in lock out) Domestic hot water temperature selector Gas valve...
  • Page 38 Interior components diagram and parts list Components diagram Fig. 41 Components Diagram 6 720 607 909...

  • Page 39: Parts List

    Interior components diagram and parts list Parts list Item Description Reference Item Description Reference Screw 8 703 404 089 GROUP 1 Screw 8 703 401 069 Front cover 8 705 431 223 Screw M4 x 12 phillips 2 910 952 122 Cover screw no.

  • Page 40: Protecting The Environment

    Protecting the environment Protecting the environment Packing The packing box may be fully recycled as confirmed by the recycling symbol Components Many parts in the heater can be fully recycled in the end of the product life. Contact your city authorities for information about the disposal of recyclable products.

  • Page 41: Ten Year Limited Warranty

    General costs associated with service, removal, installation or re-installation of the original water heater or a replaced BOSCH PRO water heaters are warranted by the water heater. Manufacturer. Bosch Thermotechnology Corp. will furnish a replacement heat exchanger and will furnish a...
  • Page 42 Ten Year Limited Warranty 6 720 607 909...
  • Page 43 Ten Year Limited Warranty 6 720 607 909...
  • Page 44 Installation manual should be left with the owner after the installation is tested and completed BOSCH THERMOTECHNOLOGY CORPORATION Bosch Termotecnologia SA Estrada de Cacia 50 Wentworth Avenue 3801 - 856 Aveiro - PORTUGAL Londonderry, NH 03053 Tel. 866-330-2730 www.boschpro.com Recycled paper © 2008 Bosch Thermotechnology Corp., Londonderry, NH...

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