Bosch C 1210 ES Installation Manual
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Bosch C 1210 ES Installation Manual

Bosch indoor residential and commercial models tankless water heaters temperature modulated with electronic ignition suitable for heating potable water and space heating, natural & liquefied petroleum (lp) gas
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C 1210 ES/ESC
INDOOR RESIDENTIAL AND COMMERCIAL MODELS
Temperature Modulated with Electronic Ignition
Suitable for heating potable water and space heating
(Intended for variable flow applications)
C 1210 ES/ESC - Natural Gas
C 1210 ES/ESC - 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 1210 ES

  • Page 1 Suitable for heating potable water and space heating (Intended for variable flow applications) C 1210 ES/ESC - Natural Gas C 1210 ES/ESC - 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

    Temperature selection Protecting the environment Use of optional remote control accessory (part no. TSTAT2) Limited Warranty Operation 14.1 Limited warranty for C 1210 ES Reset button residential model Program button 14.2 Limited warranty for C 1210 ESC Locked condition commercial model...

  • Page 3: Warning

    B In such applications a small buffer tank disconnected from the gas supply may be needed to improve performance. piping system during any pressure Contact Bosch Water Heating for testing of that system at test pressures additional information. equal to or more than 0.5 psig.
  • Page 4 Warning Warning: Do not obstruct the flow of D A N G E R combustion and ventilation air. Warning: When manually operating the relief valve, precautions must be taken prior to operating the relief valve to avoid contact with hot water coming out of the relief valve and to prevent water damage.

  • Page 5: Appliance Details

    • Pressure relief valve (FWL-2). Features Residential/commercial models BOSCH is constantly improving its products, therefore specifications are • C 1210 ES residential model subject to change without prior notice. – maximum temperature 140° F • C 1210 ESC commercial model Specifications (Technical data) –...

  • Page 6: Unpacking The Tankless Water Heater

    Appliance details • Minimum recommended water pressure: 30 PSI Unpacking the tankless water (2.07 bar) heater • Minimum well pressure 40 psi, see page 29. Before installing the unit, be certain you have the • Connections: correct heater for your type of Gas - Propane or –...
  • 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 upward and remove. Fig.

  • Page 8: General Rules To Follow For Safe Operation

    Appliance details General rules to follow for safe B 11. Water temperatures over 125°F can cause severe burns instantly. If the outlet temperature is set operation above 125°F, a thermostatically controlled mixing B 1. You must follow these instructions when you valve or temperature limiting valve should be install your heater.

  • Page 9: Installation Clearances

    Appliance details Dimensions and minimum installation clearances 6720608000-03.2AL Fig. 6 Dimensions On/Off button Model C 1210 ES Reset button Program button " TOP (A) Power ON or stand-by LED LCD display " FRONT (B) Up button " BACK Down button "...

  • Page 10: Installation Instructions

    Concentric termination or hazardous condition such as explosion or separate terminations for combustion carbon monoxide poisoning could result. and vent, must be installed on the same Bosch Thermotechnology Corp. is not wall or roof surface; however, never responsible improperly installed facing the direction of prevailing winds.
  • Page 11 Installation instructions 3.3.1 Vent material All combustion air and vent pipe materials and fittings must comply with the following: EXHAUST MAINTAIN 12 IN. (18 IN. FOR CANADA) MINIMUM CLEARANCE ABOVE Item Material United States Canada HIGHEST ANTICIPATED SNOW LEVEL. COMBUSTION MAXIMUM OF 24 IN.
  • Page 12 Installation instructions 3.3.2 Vent specifications 3" Maximum Elbow Establish vent clearances that comply with the vent Venting Maximum allowable Equivalency manufacturer's specifications applicable allowable Combustion national/local codes. Exhaust air pipe pipe length length 90° 45° Venting specifications Twin pipe 31ft 31ft 5 ft 3 ft...
  • 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 MAXIMUM OF 24 IN. ABOVE ROOF. EXHAUST EXHAUST COMBUSTION DRAIN TEE...
  • Page 17 Installation instructions EXHAUST INTAKE 4” Min. DRAIN TEE 6720608836-26.1Av 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 • 3. To install condensate drain in vent system, use The condensate must be disposed of in PVC 3" X 3" X 1.5" tee and reduce for drain accordance with local codes. connection. See chapter 3.11 “Filling the condensate trap”.
  • Page 19 Installation instructions Backdraft reducer The Heat Fab backdraft reducer (9301BFP) is the pre- ferred option for limiting backdraft (see Fig. 20). 6720608643-18.1V Fig. 20 Part nr 9301BFP Installation 6720608542-06.2V For this solution to be effective, the internal flapper must Fig. 22 be 100% closed when the water heater is not running.
  • 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 NG/LPG Altitude Minimum Minimum Maximum Vent Total equivalent (above sea power fan power fan power fan terminal vent length level) speed (P2) speed (P2) speed (P1) 6 - 25 ft Concentric 26 - 46 ft 0 - 2000 ft (0 - 610 m) 6 - 37 ft For operation at...
  • 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

    That would be 11250 cubic feet (318.6 required. concentric cubic meters) for the C 1210 ES alone. termination or separate terminations for combustion and vent, which must be – b) In unconfined spaces in buildings of...

  • Page 25: Proper Location For Installing Your Heater

    Installation instructions Proper location for installing your Mounting installation heater Warning: before starting installa- Carefully select the location of the water heater. For tion: safety and for proper heater operation, you must provide B Check that there are no loose or combustion air to the heater and a proper exhaust vent damaged parts inside the appli- system.

  • Page 26: Gas Piping & Connections

    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 1210 ES/ESC (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

    If Fig. 32 water quality exceeds one or more of the values specified below, Bosch recommends installing a water conditioner or softener. If the tankless water heater is operating in applications where the outlet temperature exceeds 140°F, a water softening system is strongly...
  • Page 30 Installation instructions Connecting the pressure relief valve (PRV) The 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 approximately 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 Water Heating if further information is needed. 6 720 644 887...

  • Page 33: Space Heating Applications

    Do not use ethylene glycol determining the size of the primary pump. (automotive antifreeze). Bosch tankless water heaters are approved for use in combination DHW and space heating applications Warning: The use of a flow switch is (open-loop setup). These water heaters are not...
  • 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 possible error code faults and must be corrected. See Gas Connections, chapter 3.8, page 26. Gas pressure must be measured upon installation. P1 fan speed: Factory default: NG: 52, LP: 53 Connecting manometer Lowering P1 fan speed reduces the maximum BTU B Shut off gas supply at installer supplied shutoff valve input.

  • 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 Unplug the water heater's power cord. disconnect the power supply cord to the heater before any service or testing B Remove the front cover, see Fig.

  • Page 37: Operation Instructions

    Operation instructions Operation instructions Fig. 48 On/Off button Reset button Program button LCD display Up button Down button Power On or stand-by LED Description of 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: Your Water Heater

    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

    Maintenance and service Program button Maintenance and service Warning: Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves when servicing. Caution: B Check and clean the complete water heating system once a year. Fig.

  • Page 41: Winterizing For Seasonal Use

    Maintenance and service Inlet Water Filter water heater to catch residual water remaining inside the water heater. • Verify the inlet filter screen is clean and undamaged. 6. Using an air compressor, blow short bursts of air The inlet water filter is located between the ¾" cold (100psi max) through the outlet water connection water inlet fitting on the right side of the appliance, until there is no water present coming through the...

  • Page 42: Condensing Heat Exchanger Unit

    If replace the gaskets and o-rings. repairs are needed, the repairs should be done by a cer- tified Bosch technician. B Assemble the condensate unit and all other parts in reverse order of disassembly.
  • Page 43 Maintenance and service P1 Operating Pressure: “ WC B Record the CO reading in P2 below. P1 CO Reading: % CO The P1 minimum operating gas pressure is 3.5" WC for Natural Gas and 8" WC for Propane. Do not proceed in P2 CO Reading: % CO...
  • Page 44 Maintenance and service Final Readings P1 CO Reading: % CO P2 CO Reading: % CO D. Returning to Service: 1. Return slotted screw cover to original position. 2. Reinstall Torx cover. 3. Remove CO analyzer probe and reinstall flathead screw with gasket in exhaust collar. 4.

  • Page 45: Program Values

    Program Description Factory Default Comment Temperature range This values are set from factory H: C 1210 ES settings they cannot be changed. C: C 1210 ESC Maximum Fan NG:52, LP:53 NG:52, LP:53 see chapter 3.14, page 35...

  • Page 46: Diagnostic Menu

    Maintenance and service Diagnostic menu 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 faucet mixing valves are common causes of plumbing Warning: If you are unable to perform crossovers. the tasks listed below, or need 8. With the power button pressed to OFF and the additional assistance please contact power supply cord unplugged, remove the unit's your original installer or a licensed gas front cover (See Page 7.

  • Page 48: Low Water Flow/Pressure

    Troubleshooting Contact your original installer or a local certified gas coming outlet. Consult technician to obtain this reading. www.boschpro.com for a detailed service bulletin on overcoming temperature fluctuations. 7. Cold water is mixing into the hot water lines (plumbing crossover). A plumbing crossover can 2.
  • Page 49 Troubleshooting specifications in Section 3.4, page 24 Combustion Air Requirements. 4. Cross contamination. Ensure that intake and exhaust terminations maintain required clearances as stated in chapter 3.3, page 10. Cross contamination between intake and exhaust may cause unstable burner flames and noise. 5.

  • Page 50: Error Codes

    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 6 720 644 887...
  • Page 51 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 52 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 53 3. Gas valve may be defective, contact Bosch Water Heating for further instrucation. Table 29 6 720 644 887...

  • Page 54: 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 Inlet 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 55: Sensor Resistance Charts

    Sensor resistance charts Sensor resistance charts Outlet sensor 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 56 Sensor resistance charts Back Flow and Exhaust sensor 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 57: Functional Scheme

    Functional scheme Functional scheme IDLE Water flow > 0.5 gpm water tap See error code table (> 1.9 l/min) open? (see WF calc.) Fan speed = correct Ionization = off Appliance Temp. limiter = closed ready to start? Temp. sensors = ok Over heat protection = ok waiting Fan speed...

  • Page 58: Interior Components Diagram And Parts List

    Interior components diagram and parts list Interior components diagram and parts list 12.1 Interior components 6720608836-06.1AL Fig. 77 Components Exhaust temperature sensor Observation window Condensing heat exchanger Backflow temperature sensor Heat exchanger Secondary air fan Ionization sensor Gas valve Primary fan (Mixer) Condensate trap LCD display Control unit...
  • Page 59 Interior components diagram and parts list 6720608836-02.1AL Fig. 78 Appliance overview 6 720 644 887...

  • Page 60: Components Diagram

    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 61 Interior components diagram and parts list 12.2.2 Group 2 6720902987.AA JF Fig. 80 Components Diagram 6 720 644 887...

  • Page 62: Interior Components Diagram And Parts List

    Interior components diagram and parts list Item Description Reference Heat exchanger 8 705 406 419 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 8 704 701 054 Site window 8 701 000 401...
  • Page 63 Interior components diagram and parts list 12.2.3 Group 3 6720902988.AA JF Fig. 81 Components Diagram Item Description Reference Item Description Reference Gas / Air Mixer 8 705 700 170 Main burner - NG 8 708 120 650 Venturi 8 700 306 226 Main burner - LPG 8 708 120 673 O-ring...
  • Page 64 Interior components diagram and parts list 12.2.4 Group 4 6720902990.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 8 704 701 107 Pressure tapping 8 703 404 219 Gas / Fan connector 8 705 202 140...
  • Page 65 Interior components diagram and parts list 12.2.5 Group 5 (optional) 6720902989.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 66 Reference Item Description Reference Electrode cables 8 704 401 346 Control unit - C 1210 ES 8 707 207 367 Flue gas limiter 8 700 400 032 Control unit - C 1210 ESC 8 707 207 369 Kit Inteligent Cascading 7 709 003 962 Fuse T2.5A...

  • Page 67: 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 68: Limited Warranty

    Limited Warranty Limited Warranty 14.1 Limited warranty for C 1210 ES res- Service Labor Costs idential model This warranty does not cover any labor costs associated with service, removal or re-installation of General part(s). All such costs must be borne by the Purchaser.

  • Page 69: Limited Warranty For C 1210 Esc Commercial Model

    This warranty does not cover any labor costs associated with service, removal or re-installation of General part(s). All such costs must be borne by the Purchaser. BOSCH tankless water heaters are warranted by the Additionally, this warranty does not cover any labor Manufacturer (BOSCH)
  • Page 70 Limited Warranty 6 720 644 887...
  • Page 71 Limited Warranty 6 720 644 887...
  • Page 72 Installation manual should be left with the owner after the installation is tested and completed BOSCH THERMOTECHNOLOGY CORP. Bosch Termotecnologia SA 50 Wentworth Avenue Estrada de Cacia Londonderry, NH 03053 Tel. 866-330-2730 3800 - 533 Cacia - PORTUGAL www.boschpro.com Recycled paper © 2010 Bosch Thermotechnology Corp., Londonderry, NH...

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