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Bosch PROTANKLESS GWH 345 User Manual

Temperature modulated with electronic ignition suitable for heating and recirculating potable water
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GWH 345/450 ESR
Temperature Modulated with Electronic Ignition
Suitable for heating and 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 PROTANKLESS GWH 345

  • Page 1 GWH 345/450 ESR Temperature Modulated with Electronic Ignition Suitable for heating and 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 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.). FCC: This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received,...
  • Page 4: Gwh-345/450-Esr Specifications (Technical Data)

    • 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 General rules to follow for safe 11.The heater must not be installed in an unheated area where temperatures will reach 36°F or lower. If the operation heater is left in an area susceptible to such 1. You must follow these instructions when you install temperatures, drain the unit and disconnect from your heater.
  • Page 7: Dimensions And Minimum Installation Clearances

    Appliance details Dimensions and minimum installation clearances Fig. 4 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 plate Fig.
  • Page 8: Applications

    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. 5. • 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 Single pipe Although it is permissible to draw combustion air from inside the structure, it is not the manufacturer’s recom- mended installation method. Always install a 3 inch elbow on the combustion air inlet to prevent foreign objects from falling into the unit (see Fig. 11). Fig.
  • Page 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 have a minimum free area of one square inch per: –...
  • Page 13: Venting

    3 feet. carbon monoxide poisoning could The use of a 90 degree elbow is result. Bosch Thermotechnology Corp. equivalent to 6 ft in vent length. will not be responsible for improperly The use of 45 degree elbow is installed appliances.
  • Page 14: Vent Connections And Air Inlet Restrictors

    (subject to change) and may result in a hazardous condition. For specific Contact your Bosch supplier for stocked vent material. questions concerning vent material, specifications, Vent Safety System usage or installation, contact the vent manufacturer directly.
  • Page 15 Installation instructions Fig. 14 Exhaust vent connection 6 720 607 909...
  • Page 16 Installation instructions Selecting inlet air 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 17 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 18: Condensate Drain Requirements

    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 using one 90° elbow and less than 3 feet inside, the recommended method is to provide of horizontal pipe.
  • Page 19: Vertical Terminations

    Installation instructions 3.6.5 Vertical terminations Over 12/12 to 14/12 1.52 Caution: Failure install Over 14/12 to 16/12 1.83 condensate drain may result in damage not covered by the manufacturer's Over 16/12 to 18/12 2.13 warranty. chapter 3.6.3. approved vent terminator must be used. Over 18/12 to 20/12 2.27 See Table 5 for known approved...
  • Page 20 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 21 Installation instructions Recommended exhaust vent terminator position Fig. 21 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 22: Exhaust Vent Configuration Examples

    Installation instructions 3.6.7 Exhaust vent configuration examples Fig. 22 Horizontal side wall venting installation Fig. 24 Vertical venting installation NOTE: If appliance uses room air, do not place any other combustion appliance in the same space, to avoid depressurizing of the building and winter freeze-up. Use room sealed operation instead.
  • Page 23: Gas Piping & Connections

    Installation instructions Gas piping & connections Measure the length of gas supply line and use the tables in Fig. 26 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: Measuring Gas Pressure

    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 If the CO content is too high, use the next smallest piping. Blow out or flush the lines before connecting restrictor. to the water heater. B After replacing the restrictor, measure CO B Full port shut off valves should be installed on both level again.
  • Page 27: 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 28: Power

    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 29: Electrical Diagram

    Operating instructions Electrical diagram Fig. 35 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 NOTICE: Except for the fuse, there are no serviceable Temperature limiter / ECO parts inside the electronics.
  • Page 30: 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 31 Maintenance and service Mode Parameter Values Not used ---------- Not used ---------- 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. Actual primary circuit Displays the actual temperature in the primary circuit as detected by temperature the internal heating circuit sensor.
  • Page 32: Troubleshooting

    Troubleshooting Troubleshooting Fault Indication Possible Cause Check Shut down by the temperature limiter • 1. Check position of heating NTC (over temperature). • 2. Check temperature limiter, cables • 3. Check system with air, air vent • 4. Bleed air from system. No Flame detected (no ignition).
  • Page 33 Troubleshooting Fault Indication Possible Cause Check Only tank loading (no heating function). No heat demand by the thermostat, • 1. Check thermostat position thermostat not well adjusted, other • 2. Check electronic unit defect. Only heating (no tank load function). No heat demand by the NTC, defect.
  • Page 34: Gwh-345/450-Esr Functional Scheme

    GWH-345/450-ESR Functional scheme GWH-345/450-ESR Functional scheme APS - Air Pressure Switch Fig. 36 Functional scheme 6 720 607 909...
  • Page 35: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list Interior components Fig. 37 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 36: Components Diagram

    Interior components diagram and parts list Components diagram Fig. 38 Components Diagram 6 720 607 909...
  • Page 37: 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 38: 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 39: Ten Year Limited Warranty

    General costs associated with service, removal or re-installation of the original water heater or a replaced water heater. BOSCH PRO water heaters are warranted by the Manufacturer. Bosch Thermotechnology Corp. will NOTE: the water heater must be free of furnish a replacement heat exchanger and will furnish a...
  • Page 40 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...