Bosch C 950 ES Installation Manual
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Bosch C 950 ES Installation Manual

Temperature modulated with electronic ignition suitable for heating potable water and space heating
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C 950 ES
INDOOR MODEL
Temperature Modulated with Electronic Ignition
Suitable for heating potable water and space heating
(Intended for variable flow applications)
C 950 ES - Natural Gas
C 950 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
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.
• 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
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 C 950 ES

  • Page 1 Suitable for heating potable water and space heating (Intended for variable flow applications) C 950 ES - Natural Gas C 950 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

    12.2 Components diagram your water heater Power Temperature selection Protecting the environment Use of optional remote control accessory (part no. TSTAT2) LIFETIME LIMITED WARRANTY Operation FOR BOSCH PRO TANKLESS Reset button WATER HEATERS Program button Locked condition Notes 6 720 646 812...

  • Page 3: Warning

    Warning Warning For your safety Warning: The appliance should be Do not store or use gasoline or other flammable, located in an area where leakage of the combustible or corrosive vapors and liquids in the heater or connections will not result in vicinity of this or any other appliance.
  • Page 4 Warning FCC: Warning: If a relief valve discharges This device complies with Part 15 of the FCC rules. periodically, this may be due to thermal Operation is subject to the following two conditions: (1) expansion in a closed water supply This device may not cause harmful interference, and (2) system.

  • Page 5: Appliance Details

    Appliance details Appliance details BOSCH is constantly improving its products, therefore specifications are subject to change without prior notice. Features Parts Specifications (Technical data) • Key Pad interface control Approved in US/Canada • High power pre-mix compact burner with low NOx...

  • Page 6: Unpacking The Heater

    Please complete and return the enclosed product 2000ft, refer to Section 3.3.7 Fan speed registration card. adjustment. The C 950 ES is not approved or designed for: • Manufactured (mobile) homes, boats or any mobile installation. (Modular homes are acceptable for installation).
  • Page 7 Appliance details To remove front cover B Loosen the two Phillips head screws located on bottom rear of cover (see Fig. 3). 6720644956-11. 1 V Fig. 5 Remove the combustion cover Fig. 3 Loosen the two screws B Lift front cover panel upward and remove. Fig.

  • Page 8: General Rules To Follow For Safe Operation

    Appliance details General rules to follow for safe 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 9: Installation Clearances

    Appliance details Dimensions and minimum installation clearances 6720608000-03.2AL Fig. 6 Dimensions On/Off button Model C 950 ES Reset button Program key TOP (A) 12” Power ON or stand-by LED LCD display FRONT (B) 1” Up button BACK 0” Down button 1”...

  • Page 10: Installation Instructions

    Item Material United States Canada such as explosion or carbon monoxide poisoning could result. Bosch Thermotechnology Corp. PVC schedule 40 ANSI/ASTM D1785 responsible improperly installed Vent or PVC-DWV ANSI/ASTM D2665 air pipe appliances.
  • Page 11 Installation instructions Venting specifications Kit part no. Description Length and quantity Diam. Aproved terminals 196016 “T” terminal 3- In. Rain Cap 90° elbow 4- In. Diameter SDR-26 PVC Flue Cap* 24 In. long 3 or 4 inches (ECAP321) Pipe Vertical terminations only 3"...
  • Page 12 Installation instructions Maximum combustion air and exhaust pipe Use of elbows length It is recommended to limit the amount of elbows used in The following tables display the maximum allowable the exhaust and combustion air piping to reduce friction straight pipe lengths for combustion air and exhaust in the air flow.
  • Page 13 Installation instructions Calculation example for 3" venting: Calculation example for 4" venting: Exhaust Exhaust System used Concentric System used Twin pipe Number of 90° elbows needed: Number of 90° elbows needed: Number of 45° elbows needed: Number of 45° elbows needed: Table 8 Table 12 Calculation of example...
  • Page 14 Installation instructions Required direct vent terminal clearances (twin pipe / concentric penetration) 6720608836-23.1Av Fig. 9 Canadian installations U.S. installations Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. Clearance to window or door that may be opened 36 in.
  • Page 15 Installation instructions Required other than direct vent terminal clearances (single pipe penetration) 6720608836-23.1Av Fig. 10 Canadian installations U.S. installations Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. Clearance to window or door that may be opened 36 in.
  • Page 16 Installation instructions 3.3.3 Vent configuration examples MINIMUM Below are approved examples of vertical and horizontal 1” venting installations. MAINTAIN 12 IN. (18 IN. FOR CANADA) MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL. INTAKE EXHAUST MAXIMUM OF 24 IN. ABOVE ROOF. EXHAUST COMBUSTION DRAIN TEE...
  • Page 17 Installation instructions EXHAUST INTAKE 4” Min. DRAIN TEE Fig. 16 Exhaust connection B Attach the combustion air inlet accessory to the top of the unit Fig. 17 (position 2) using the 3 screws and gasket provided, and install 3" air intake pipe over the 6720608643-12.2V accessory.
  • Page 18 Installation instructions External condensate drain installation The condensate must be disposed of in If an external condensate drain (installer supplied) must accordance with local codes. be installed (Section 3.3.2), the following See chapter 3.11 “Filling the condensate recommended: trap”. • 1. Install condensate drain on a horizontal section of the exhaust pipe as close to the heater as possible.
  • Page 19 Installation instructions Backdraft reducer The Heat Fab backdraft reducer (9301BFP) is the pre- ferred option for limiting backdraft (see Fig. 20). Note: The following solution is available only for 3" diameter venting. 6720608643-18.1V Fig. 20 Part nr 9301BFP 6720608542-06.2V Fig. 22 Installation For this solution to be effective, the internal flapper must Preferred damper position for vertical terminations...
  • Page 20 Installation instructions 3.3.7 Fan speed adjustment ! IMPORTANT INFORMATION: Natural gas heaters with installation altitudes below 2,000 ft above sea level disregard this section. Installation adjustment: After installing the tankless water heater, the fan speed values for minimum power (P2) and maximum power (P1) may need adjustment due to variations in altitude and vent pipe length.
  • Page 21 Installation instructions Natural Liquid propane Altitude Maximum Maximum Vent Total equivalent Minimum power (above sea power fan power fan terminal vent length fan speed (P2) level) speed (P1) speed (P1) 0 - 2000 ft Concentric 6 - 25 ft (0 - 610 m) 26 - 46 ft modification modification...
  • Page 22 Installation instructions Adjusting minimum power fan speed (P2) Adjusting maximum power fan speed (P1) To select fan speed: To select fan speed: B Press ON/OFF button into OFF. B Press ON/OFF button into OFF. B Press and hold "Program" button and press B Press and hold "Program"...
  • Page 23 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 24: Combustion Air Requirements

    Installation instructions Combustion air requirements below for providing adequate combustion air for the water heater as well as any other appliances that may consume air in the same space. Always follow local Warning: In areas where outside codes if they are more stringent and regulations. temperatures routinely come close to freezing, sealed combustion operation •...

  • Page 25: Proper Location For Installing Your Heater

    Installation instructions Proper location for installing your Front cover should be removed (see heater instructions on page 7) in order to inspect components visually. Carefully select the location of the water heater. For your safety and for proper heater operation, you must provide combustion air to the heater and a proper Warning: Do not install this appliance exhaust vent system.
  • Page 26 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 27 Installation instructions Minimum Gas supply 3” Inlet gas particle screen (included) Fig. 29 Gas connection Gas piping Once connections are made, check for gas leaks at all joints. Apply some gas leak detection solution to all gas Fig. 30 fittings. Bubbles are a sign of a leak. A combustible gas detector may also be used to detect for leaks.
  • Page 28 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 C 950 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 29: Water Connections

    For water analysis data call your local water department, or if on a well, have well water analyzed periodically. If Fig. 32 water quality exceeds one or more of the values specified below, Bosch recommends consulting a local water treatment professional for water softening/ conditioning options. Description Max.
  • Page 30 Installation instructions Connecting the pressure relief valve (PRV) A listed pressure relief valve 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. The discharge line must be a minimum of 4”...

  • Page 31: Filling The Condensate Trap

    Installation instructions 3.11 Filling the condensate trap B Fill the condensate trap by pouring approx.14 oz. (400ml) of water into the top of the drain tube. To The condensate trap can be filled before or after avoid damage to the appliance use a funnel in this connecting the vent pipe.

  • Page 32: Domestic Hot Water Recirculation

    Timed or thermostatically controlled operation of the pump is commonly done. Contact Bosch Thermotechnology if further information is needed. 6 720 646 812...

  • Page 33: Space Heating Applications

    Warning: The use of a flow switch is Bosch tankless water heaters are approved for use in recommended to ensure DHW priority combination DHW and space heating applications and to prevent “cold-blow” situations (open-loop setup).
  • Page 34 Installation instructions 6720644887-02.1V Fig. 42 Space heating diagram Hot water outlet Cold water inlet Pressure relief valve Gas supply Shut off gas valve Thermal expansion tank (as required) Atmospheric vacuum breaker Cold inlet Check valve Pump Thermostatic mixing valve Thermometer (optional) DHW outlet Water to water heat exchanger Backflow preventer...

  • Page 35: Measuring Gas Pressure

    Installation instructions 3.14 Measuring gas pressure Gas pressures lower than 3.5" W.C. for Natural Gas or 8" W.C. for LPG will result in insufficient degree rise to Confirm gas pressure upon installation. the hot water being used, reduced hot water volume, possible error code faults and must be corrected.

  • Page 36: Electrical Connections

    Electrical connections Electrical connections Electrical power supply Position of the fuses in control unit To check fuses, proceed as follows: safety reasons, Warning: B Remove the front cover, see Fig. 4, page 7. disconnect the power supply cord to the heater before any service or testing B Remove the three screws from the control unit.

  • Page 37: Operation Instructions

    Operation instructions Operation instructions Fig. 48 On/Off button Reset button Program Key LCD display Up button Down button Power On or stand-by LED Description LCD Display Fig. 52 Locked condition indicator (only with remote Warning: Do not use any cleaning control) agressive or corrosive agents to clean the window.

  • Page 38: Temperature Selection

    Operation instructions For your safety read before Temperature selection operating your water heater To select hot water temperature: B Press buttons in order to reach desired Warning: If you do not follow these temperature. instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

  • Page 39: Operation

    Operation instructions Solar mode control unit (Fig. 84, component 16) is required when installing the remote control with this heater. The water heater will not ignite if inlet water temperature exceeds the set temperature on the appliance. In this NOTE: up to 6 remote controls can be condition, the solar mode indicator will show on the programmed for one single water heater, LCD display.

  • Page 40: Program Button

    Operation instructions Program button Fig. 63 “Program” key 5.8.1 Memorizing selected temperature B Press buttons to select desired temperature. B Hold “Program” button for 3 seconds to save temperature. When LCD stops blinking, temperature is saved in memory. Using “Program” function In order to select memorized temperature B Press “Program”...

  • Page 41: Maintenance And Service

    • Inspect heat exchanger fincoil for soot build-up or 2. Inspect combustion chamber blockage. To access fincoil, consult service bulletin at www.bosch-climate.us. If there is evidence of soot 3. Inspect burner build-up or blockage, the heat exchanger should be removed by a professsional and cleaned thoroughly.

  • Page 42: Mineral Scale Build-Up

    5. Connect a line (A) from the outlet of the circulating repairs are needed, the repairs should be done by a cer- pump (installer supplied) to the inlet water fitting on tified Bosch technician. the water heater (see Fig. 65.) 6. Using another line (B), connect the water outlet fitting on the water heater.

  • Page 43: Adjusting Co2

    Maintenance and service B Remove the condensing heat exchanger unit from The P1 minimum operating gas pressure is 3.5" WC for the appliance by pulling it towards you. Natural Gas and 8" WC for Propane. Do not proceed in adjusting CO until pressure is at or above these levels, B Dismantle all parts for inspection and cleaning.
  • Page 44 Maintenance and service D. Returning to Service: Note: When making adjustments, make sure 1. Return slotted screw cover to original position. combustion cover is installed. 2. Reinstall Torx cover. 3. Remove CO analyzer probe and reinstall flathead range (%) Max. CO level screw with gasket in exhaust collar.

  • Page 45: Program Values

    3.3.7, page 20 Remote see chapter 5.5, page 39 Controls installed Access to see chapter 6.7, page 46 Diagnostic Mode Cascade Mode contact Bosch for details Temperature Unit °F °F °C Appliance Type Condensing / Non-condensing note: incorrect setting will cause errors.

  • Page 46: Control Board Diagnostics

    Maintenance and service Control board diagnostics 7th most recent error 1. Press ON/OFF button to turn off the appliance. 8th most recent error 2. Press and hold "Program" button and press 9th most recent error ON/OFF button to turn appliance ON. 10th most recent error 3.

  • Page 47: Troubleshooting

    Troubleshooting Troubleshooting connections between the water valve, control unit and Warning: If you are unable to perform electrode set. See chapter 12.2 , page 59 for location the tasks listed below, or need of these parts. additional assistance please contact 9.

  • Page 48: Low Water Flow/Pressure

    5. Lack of gas pressure. Inadequate gas pressure will outlet. Consult www.bosch-climate.us for a detailed cause the fuel-to-air mixture (CO ) to be out of service bulletin on overcoming temperature fluctuations.

  • Page 49: Problem Solving

    3. Check gas pressure. Low gas pressure may prevent the heater from reaching desired output temperature. 4. Check supply voltage. It must be 120VAC and properly grounded. 5. Possible defective control unit call Bosch Water Heating for further instructions. Table 29 * By installer or service technician only.
  • Page 50 5. Check gas pressure. Low gas pressure may cause the fan to change its speed to meet desired temperature. 6. Possible defective control unit call Bosch Water Heating for further instructions. No rotational speed sensor signal 1.
  • Page 51 3.3 page 10 venting may cause this failure. See 4. Call Bosch Water Heating for further instructions. Overheat sensor (ECO) open 1. Disconnect power supply cord and check wire connections on Fig. 77...
  • Page 52 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 53: Electrical Diagram

    Electrical diagram Electrical diagram T=90°C T=194°F T=104°C T=220°F T=110°C T=230°F Casc. input Casc. output Back flow 6720608158-01.1AL Fig. 72 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)

  • Page 54: 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 55 Sensor resistance charts Back Flow and Exhaust NTC 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...

  • Page 56: Functional Scheme

    Functional scheme Functional scheme Fig. 76 Functional scheme 6 720 646 812...

  • Page 57: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list 12.1 Interior components Fig. 77 Components Exhaust temperature sensor Ignition electrodes Flue gas collector Observation window Heat exchanger Backflow temperature sensor Ionization sensor Secondary air fan Primary fan (Mixer) Gas valve Hot water temperature sensor Condensate trap...
  • Page 58 Interior components diagram and parts list Fig. 78 Appliance overview 6 720 646 812...
  • Page 59 Interior components diagram and parts list 12.2 Components diagram 12.2.1 Group 1 13 15 6720902973.AB JF Fig. 79 Components Diagram Item Description Reference Item Description Reference Combustion cover clip 8 701 201 032 Front cover 8 705 431 412 Grommet set 8 710 203 039 Cover shield 8 705 506 906...
  • Page 60 Interior components diagram and parts list 12.2.2 Group 2 6720902980.AA JF Fig. 80 Components Diagram 6 720 646 812...
  • Page 61 Interior components diagram and parts list Item Description Reference Heat exchanger (LP Gas) 8 705 406 421 Heat exchanger (Natural Gas) 8 738 721 270 Heat exchanger top gasket 8 704 701 052 Condensing exchanger inlet 8 705 700 159 Overheat sensor (ECO) 8 707 206 204 Heat exchanger bottom gasket...
  • Page 62 Interior components diagram and parts list 12.2.3 Group 3 6720902975.AA JF Fig. 81 Components Diagram Item Description Reference Item Description Reference Screw 8 703 403 012 Main burner (Natural Gas) 8 708 120 642 Gas / Air Mixer 8 705 700 170 Main burner (LP Gas) 8 708 120 699 Venturi...
  • Page 63 Interior components diagram and parts list 12.2.4 Group 4 6720902976.AA JF Fig. 82 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...
  • Page 64 Interior components diagram and parts list 12.2.5 Group 5 (optional) 6720902977.AA JF Fig. 83 Components Diagram Item Description Reference Item Description Reference Inlet fitting 8 703 305 348 Water valve with engine and 8 708 505 024 temperature sensor O-ring 8 700 205 157 O-ring 8 700 205 147...
  • Page 65 Interior components diagram and parts list 12.2.6 Group 6 6720608158-75.2V Fig. 84 Components Diagram Item Description Reference Item Description Reference Flue gas limiter 8 700 400 032 Control unit 8 707 207 366 Kit Inteligent Cascading 7 709 003 962 Fuse T2.5A 1 904 521 342 Anti freeze kit...

  • Page 66: 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 67: For Bosch Pro Tankless Water Heaters

    LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERS LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERS MODELS COVERED ITEMS NOT COVERED This limited warranty provided Bosch This limited warranty does not cover the following cir- Thermotechnology Corp. (BTC) and covers model C cumstances: 950 ES (hereinafter referred to as "Water Heater").
  • Page 68 LIFETIME LIMITED WARRANTY FOR BOSCH PRO TANKLESS WATER HEATERS LIMITED WARRANTY OTHER THAN THE OBLIGATIONS OF BTC EXPRESSLY SET FORTH HERIN, BTC DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUD- ING BUT NOT LIMITED TO ANY IMPLIED WARRAN- TIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

  • Page 69: Notes

    Notes Notes 6 720 646 812...
  • Page 70 Notes 6 720 646 812...
  • Page 71 Notes 6 720 646 812...
  • Page 72 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 USA Tel. 866-330-2730 3800 - 533 Cacia - PORTUGAL www.bosch-climate.us © 2011 Bosch Thermotechnology Corp., Londonderry, NH...

This manual is also suitable for:

C 1050 es

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