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Bosch GWH 715 ES User Manual

Indoor model temperature modulated with electronic ignition suitable for heating potable water only - not approved for space heating purposes (intended for variable flow applications)
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GWH 715 ES
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications)
GWH 715 ES - Natural Gas
GWH 715 ES - 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
vapors and liquids in the vicinity of this or any other
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
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.
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light 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
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.


Table of Contents

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  Summary of Contents for Bosch GWH 715 ES

  • Page 1 Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications) GWH 715 ES - Natural Gas GWH 715 ES - 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

    Winterizing for seasonal use Appliance details Mineral scale build-up Features Adjusting CO GWH 715 ES Specifications (Technical data) 5 Program values Unpacking the GWH 715 ES heater Control board diagnostics General rules to follow for safe operation Dimensions and Minimum...
  • Page 3: Warning

    Warning Warning Warning: The appliance should be located in an area where leakage of the For your safety tank or connections will not result in damage to the area adjacent to the Do not store or use gasoline or other flammable, appliance or to lower floors of the combustible or corrosive vapors and liquids in the structure.
  • Page 4: Appliance Details

    6720608643-16.1AL • Vertical vent kit (ESVVT) Fig. 1 • Horizontal vent kit (4TWHVK3SII) BOSCH is constantly improving its products, therefore specifications are subject to change without prior notice. 1) 4TWHVK3S vent kit is compatible with this appliance but requires the purchase of an additional 12" piece of straight pipe to meet minimum vent length requirements.
  • Page 5: Technical Data

    Appliance details Specifications Dimensions (Technical data) • Depth (in): 11¼” (286 mm) • Width (in): 17 ” (452 mm) Approved in US/Canada • Height (in): 30½” (775 mm) Capacity • Weight: 67 pounds (30.5 kg). Maximum flow rate: 7.3 GPM (27 l/min) at a 45°F (25°C) rise.
  • Page 6: Unpacking The Gwh 715 Es Heater

    To remove combustion cover (service only) registration card. B Open the four clips and remove the combustion The GWH 715 ES is not approved or designed for: cover see Fig. 5. • Manufactured (mobile) homes, boats or any mobile installation. (Modular homes are acceptable for installation).
  • Page 7: General Rules To Follow For Safe Operation

    Appliance details General rules to follow for safe B 10. Failure to install heater correctly may lead to unsafe operation and void the warranty. operation B 1. You must follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/ NFPA 54.
  • Page 8: Installation Clearances 8

    Appliance details Dimensions and Minimum installation clearances Fig. 6 Dimensions On/Off button Reset button Model GWH 715 ES Program key TOP (A) 12” Power ON or stand-by LED LCD display FRONT (B) 1” Up button Down button BACK 0” SIDES 1”...
  • Page 9: Installation Instructions

    Common installation practice is to Bosch Water Heating will not be first determine the venting/combus- responsible for improperly installed tion air point of termination, then de- appliances. sign the piping layout back to the heater.
  • Page 10 Installation instructions 3.3.1 Vent material and specifications 3” Z flex Protech Heat Fab Establish vent clearances that comply with the vent VENTING manufacturer's specifications. In all cases, follow local 3” codes. See Table 2. Horizontal 2SVSTB03 FSTB3 9390 TEE Terminal Diam.
  • Page 11 Vent Safety System The GWH 715 ES will shut down if inadequate exhaust venting is detected or a lack of combustion air is provided to the unit; see troubleshooting section on page 39. See error code to confirm error, correct the problem and then reset the heater before operating.
  • Page 12 Installation instructions Recommended exhaust vent terminator position Fig. 10 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 13 Installation instructions F i x e C l o s 6720608836-18.1JF Fig. 11 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 24 inches 24 inches...
  • Page 14 Installation instructions Venting configuration examples Fig. 14 Above the roof clearance requirements from rain cap (combustion air piping not shown) Fig. 12 Horizontal side wall venting installation (combustion air piping not shown) Important: Note: Pitch horizontal sections down to the heater.
  • Page 15 Installation instructions • All vertical terminating vent installations Room sealed installation (TWIN PIPE SYSTEM) Installing this water heater as a room sealed (TWIN • Horizontal terminating vent installations where the PIPE SYSTEM) is the recommended method. Contact total vent length is greater than 10 feet your dealer for available vent termination kits and vent •...
  • Page 16 Installation instructions The exhaust vent system must vent directly to the Warning: Approved terminators must outside of the building and an adequate amount of be used for inlet and exhaust vent indoor combustion air must be provided for this systems to prevent rain from entering installation.
  • Page 17 Installation instructions Attention residents of the Commonwealth of Massachusetts: In the Commonwealth of Massachusetts the following signage installed in accordance with the provisions of regulation went into effect on 12/30/2005: 248 CMR 5.08(2)(a)1 through 4. (a)For all side wall horizontally vented gas fueled (b)EXEMPTIONS: The following equipment is exempt equipment installed in every dwelling, building or from 248 CMR 5.08(2)(a)1 through 4:...
  • Page 18 Installation instructions 3.3.3 Vent connections Exhaust venting must be 3" or 4" sealed B Attach the flue gas exhaust accessory (8 705 504 single wall stainless steel (AL29-4C) vent 151) to the top of the unit (position 1) using the 4 pipe.
  • Page 19 Installation instructions 3.3.4 Fan speed adjustment • 1 - 1' straight section = Total straight pipe length 22’ • 2 - 90° elbow. IMPORTANT! Installation adjustment: Intake After installing the GWH C 715 ES, the fan speed values for minimum power (P2) and maximum power •...
  • Page 20 Installation instructions Liquid Natural Gas propane Altitude Total Maximum Maximum (above sea Vent equivalent Minimum power power fan power fan level) terminal vent length fan speed (P2) speed (P1) speed (P1) 3 - 32 ft 0 - 2000 ft Twin modification modification (0 - 610 m)
  • Page 21: Combustion Air Requirements

    National Twin pipe Fuel Gas Code. Consult a HVAC specialist if your air The GWH 715 ES is designed as a sealed combustion infiltration rate is questionable. appliance. It is recommended that the combustion air The space must have two permanent openings, one be provided by a dedicated 3”...
  • Page 22: Heater Placement And Clearances

    Heater placement and clearances The GWH 715 ES is approved for installation on a combustible wall (see chapter 3.7 Mounting Studs 16" installation) provided the floor covering below (406mm) on the heater is noncombustible.
  • Page 23 Installation instructions Gas piping & connections Before connecting the gas supply, check the rating plate on the right side of the heater to be sure that the heater is rated for the same gas to which it will be connected. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
  • Page 24 Installation instructions Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks. Danger: If you have a leak, shut off the gas.
  • Page 25 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 715 ES (example: ¾” B.I. Natural Gas pipe for 10 ft (3.0m). will handle 278,000 btu’s (81.5 kWh). For multiple appliances combine the total maximum btu input load and then refer to applicable chart below.
  • Page 26: Water Connections

    For water analysis data call your local water department, Fig. 31 or if on a well, have well water analyzed periodically. If water quality exceeds one or more of the values specified below, Bosch recommends installing a water conditioner or softener. Description Max. Levels 6.5 - 8.5...
  • Page 27: Domestic Hot Water Recirculation

    Timed or thermostatically controlled operation of the pump is commonly done. Contact Bosch Water Heating if further information is needed. 6 720 608 158...
  • Page 28: Measuring Gas Pressure

    Installation instructions 3.12 Measuring gas pressure B Record lowest operating gas pressure reading in table 14. Confirm gas pressure upon installation. Gas pressures lower than 3.5" W.C. for Natural Gas or 8" W.C. for LPG will result in insufficient degree rise to Connecting manometer the hot water being used, reduced hot water volume, B Shut off gas supply at installer supplied shutoff valve...
  • Page 29: Electrical Connections

    Fig. 39, pos. 2. The GWH 715 ES requires an electrical power supply B Check the fuses in the printed circuit board, see Fig. from a 120VAC / 60Hz properly rated receptacle and 39, pos.
  • Page 30: Operation Instructions

    Operation instructions Operation instructions Fig. 40 On/Off button Reset button Program Key LCD display Up button Down button LED - Power On indicator or Stand-by Description LCD display Fig. 44 Lock indicator (only with remote control) Warning: Do not use any cleaning or corrosive agent to clean the window.
  • Page 31: Temperature Selection

    B If you cannot reach your gas supplier, call the fire adjusted on the front control panel of the heater. department. The GWH 715 ES has an electronically controlled gas valve that modulates the burner input in response to C. Use only your hand to press the on/off control switch.
  • Page 32: Operation

    Operation instructions Solar mode Operation The water heater will not ignite if inlet water temperature B When a hot water tap is opened, main burner ignites exceeds the set temperature on the appliance. In this and LCD displays the symbol condition, the solar mode indicator will show on the LCD display.
  • Page 33: Locked Condition

    Maintenance and service B Press “Program” key. LCD shows pre-memorized temperature, which is now the hot water selected temperature. Locked condition This condition is only valid for appliances with one or more remote controls installed. Fig. 55 “Program” key Memorizing selected temperature B Press buttons to select temperature to be memorized.
  • Page 34: Winterizing For Seasonal Use

    Maintenance and service should be periodically flushed with a descaling Descaling using a pump solution. Scale build up will shorten the life of the 1. Disconnect electrical supply from the water heater. water heater and damage resulting from is not 2.
  • Page 35: Adjusting Co 2

    Maintenance and service 16.Reconnect electrical supply to unit, open water B Insert CO analyzer probe into the measuring port. shutoff valves, and return the unit to service. The tip of the probe should be in the center of the flue pipe (approx 1.5"...
  • Page 36 Maintenance and service D. Returning to Service: Max. CO 1. Return slotted screw cover to original position and range (%) level tighten philips screw. (measured) 2. Reinstall Torx cover. 3. Remove CO analyzer probe and reinstall flathead Nat. Gas screw with gasket in exhaust collar. max.
  • Page 37: Program Values

    3.3.4, page 19 Remote Con- see chapter 5.5, page 32 trols installed Access to Diag- see chapter 6.6, page 38 nostic Mode Cascade Mode contact Bosch for details Temperature °F °F °C Unit Appliance Type Condensing / Non-condensing*...
  • Page 38: Control Board Diagnostics

    Maintenance and service Control board diagnostics Diagnostic menu 1. Turn on/off switch on water heater to off (O) position. Entry/Exit into sub-modes B Press and hold the program ' ' button while Set-point temperature turning the on/off switch to the on (I) position. The display will cycle through a startup procedure Inlet water temperature (°F) including the software version.
  • Page 39: Troubleshooting

    Troubleshooting Troubleshooting and mixing valves are common causes of plumbing Warning: If you are unable to perform crossovers. the tasks listed below, or need 8. With the ON/OFF switch turned to OFF (O) position additional assistance please contact and the power supply cord unplugged, remove the your original installer or licensed gas unit's front cover (See Page 6.
  • Page 40: Low Water Flow/Pressure

    Troubleshooting unintentionally mix cold water with the hot water 2. Unbalanced pressure in water lines. Any restriction in leaving the heater. The end result is a cooler water the water heater, such as a clogged inlet filter screen, temperature than desired. To check for a plumbing can result in unequal pressures between the cold crossover, shut off the cold water supply to the water and hot water lines.
  • Page 41 Troubleshooting intake and exhaust may cause unstable burner flames and noise. 5. Lack of adequate gas pressure. Inadequate gas pressure will cause the fuel-to-air mixture (CO ) to be out of adjustment. This will result in unstable burner flames and noise. Ensure gas pressure is in accordance with specifications in section 3.12, page 28 Measuring Gas Pressure.
  • Page 42: Problem Solving

    Problem solving Problem solving Error code diagnostics To remove error code from the display, press the reset button. Display Cause Solution Fault in the flue gas limiter. 1. Check continuity of the flue gas limiter (see Fig. , page Temperature above 230°F Go to steps two and three to determine air box temperature...
  • Page 43 4. Check supply voltage. It must be 120VAC and properly grounded. 5. Possible defective control unit call Bosch Water Heating for further instructions. Primary fan rotation too low on 1. Disconnect power supply cord and check wire connection on operation.
  • Page 44 4. Call Bosch Water Heating for further instruction. Overheat sensor (ECO) open 1. Disconnect power supply cord and check wire connections on circuit...
  • Page 45 The voltage should measure 24VDC between the left pair of wires and 24VDC between the right pair of wires when the unit is operating. If voltage is not proper, contact Bosch Water Heating for further instruction. 3. Gas valve may be defective, contact Bosch Water Heating for further instrucation.
  • Page 46: Electrical Diagram

    Electrical diagram Electrical diagram T=104°C T=220°F T=110°C T=230°F Casc. input Casc. output Back flow 6720608158-92.1AL Fig. 62 Electrical scheme Intlet water temperature sensor Outlet water temperature sensor Backflow temperature sensor Cascading output connection Cascading input connection Ionization sensor Water flow sensor Flue gas limiter Heat exchanger overheat sensor (ECO) Gas valve...
  • Page 47: Sensor Resistance Charts

    Sensor resistance charts Sensor resistance charts Outlet NTC characteristics 2 2 2 2 17 10 5 2 12 10 0 2 0 7 2 0 2 19 7 19 2 18 7 18 2 16 7 16 2 14 7 14 2 13 7 13 2...
  • Page 48 Sensor resistance charts Back Flow characteristics 3 0 2 2 9 7 2 9 2 14 5 2 8 7 2 8 2 14 0 2 7 7 2 7 2 13 5 2 6 7 2 6 2 13 0 2 5 7 12 5 2 5 2...
  • Page 49: Gwh 715 Es Functional Scheme

    GWH 715 ES Functional scheme GWH 715 ES Functional scheme Fig. 66 Functional scheme 6 720 608 158...
  • Page 50: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list 12.1 Interior components Fig. 67 Components Flue gas collector Ignition electrodes Heat exchanger Observation window Flame sensor Backflow temperature sensor Primary fan (Mixer) Secondary air fan Outlet temperature sensor Gas valve LCD display Water valve with engine and temperature sensor...
  • Page 51 Interior components diagram and parts list Fig. 68 Appliance overview 6 720 608 158...
  • Page 52: Components Diagram

    Interior components diagram and parts list 12.2 Components diagram 12.2.1 Group 1 13 15 6720902973.AA JF Fig. 69 Components Diagram Item Description Reference Item Description Reference Combustion cover clip 8 701 201 032 Front cover 8 705 431 264 Grommet set 8 710 203 039 Cover shield 8 705 506 857...
  • Page 53 Interior components diagram and parts list 12.2.2 Group 2 6720902974.AA JF Fig. 70 Components Diagram Item Description Reference Item Description Reference Site window 8 701 000 401 Heat exchanger 8 705 406 356 Ignition group 8 701 302 249 Heat exchanger top gasket 8 704 701 052 Heat exchanger O-ring 8 700 205 147...
  • Page 54 Interior components diagram and parts list 12.2.3 Group 3 6720902975.AA JF Fig. 71 Components Diagram Item Description Reference Item Description Reference Gas / Air Mixer 8 705 700 170 Main burner 8 708 120 699 Air duct O-ring 8 700 205 149 Burner gasket 8 704 701 087 Venturi...
  • Page 55 Interior components diagram and parts list 12.2.4 Group 4 6720608158-73.1AL Fig. 72 Components Diagram Item Description Reference Item Description Reference Gas filter 8 700 507 002 Gas valve 8 707 021 019 Gasket 8 704 701 085 Pressure tapping 8 703 404 219 Gas / Fan connector 8 705 202 140 Washer...
  • Page 56 Interior components diagram and parts list 12.2.5 Group 5 6720902977.AA JF Fig. 73 Components Diagram Item Description Reference Item Description Reference Inlet fitting 8 703 305 348 Water valve with engine 8 708 505 024 O-ring 8 700 205 157 O-ring 8 700 205 147 Watervalve clip...
  • Page 57 Interior components diagram and parts list 12.2.6 Group 6 Fig. 74 Components Diagram Item Description Reference Item Description Reference Electrode cables 8 704 401 346 Control unit 8 707 207 257 Flue gas limiter 8 700 400 032 Fuse T2.5A 1 904 521 342 Cascading kit (optional) TLINK...
  • Page 58: 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 59: Limited Warranty

    Bosch Thermotechnology Corp. shall be in lieu of any • 4. to failure of the heat exchanger resulting from the and all other warranties, express or implied, including...
  • Page 60 Installation manual should be left with the owner after the installation is tested and completed Replacement Parts available from: BOSCH THERMOTECHNOLOGY CORP. Bosch Termotecnologia SA 50 Wentworth Avenue Estrada de Cacia Londonderry, NH 03053 Tel. 866-330-2730 3801 - 856 Aveiro - PORTUGAL © 2008 Bosch Thermotechnology Corp., Londonderry, NH...

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