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 vapours and liquids in the vicinity of this or any other appliance. Improper installation, adjustment, alteration, 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.
| Table of contents Table of contents 1 Key to symbols and safety instructions . . . . . . . . . . . . . . . . . . . 3 1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 FCC rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Appliance details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.
Key to symbols and safety instructions | 3 1 Key to symbols and safety instructions 1.1 Key to symbols Warnings Warnings in this document are identified by a warning triangle printed against a grey background. Keywords at the start of a warning indicate the type and seriousness of the ensuing risk if measures to prevent the risk are not taken.
| Key to symbols and safety instructions Danger of explosion of flammable gases ▶ Work on gas components may only be carried out by a trained and certified installer. ▶ Installation, gas and flue connection, initial commissioning, electrical connections and annual maintenance must only be carried out by a trained and certified installer. Combustion air ▶ Keep the combustion air free of corrosive substances (halogenated hydrocarbons that contain chlorine or fluorine compounds).
Key to symbols and safety instructions | 5 Flooding ▶ After a flood, do not use the appliance if any part has been submerged. Damage to appliances that have been submerged can be quite severe and pose numerous safety risks. ▶ Every appliance that has been submerged must be replaced. For your safety ▶ Do not store or use gasoline or other flammable, combustible or corrosive vapors and liquids in the vicinity of this or any other appliance. DANGER: Fatal accidents! Carbon monoxide poisoning.
| FCC rules NOTICE: WARNING: Personal Injury from toxic chemicals. ▶ Do not obstruct the flow of combustion and ventilation air. ▶ A 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. NOTICE: Appliance malfunction! ▶ If power is lost while appliance is operating. Turn off both water and power for 15 seconds to reset device. WARNING: Risk of scalding and property damage.
Appliance details | 7 1) Source: Moritz, A.R. and Henriques, F.C., Jr. (1947). Studies of thermal injury. II. The relative importance of time and surface temperature in the causation of cutaneous burns, Am J of Pathol, 23, 695-720. 3 Appliance details 3.1 Features Residential / Commercial models • C 1210 ES residential model – maximum temperature 140 °F • C 1210 ESC commercial model – maximum temperature 180 °F Parts • Key Pad interface control.
| Appliance details 3.2 Specifications (Technical data) Technical characteristics Units C 1210 ES/ESC Height inches (mm) 30½ (775) Weight pounds (kg) 74 (33.5) V AC 120 Hz 60 mA 40 A 2.
Appliance details | 9 3.3 Unpacking the heater Before installing the unit, be certain you have the correct heater for your type of Gas - Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover. Fig. 2 [A] [B] 3.3.2 Remove front cover ▶ Loosen the two Phillips head screws located on bottom rear of cover. Rating plate Serial number Type of gas 3.3.
| Appliance details 3.3.3 Remove combustion cover (service only; unplug appliance before removing cover) ▶ Open the four clips and remove the combustion cover. • 8. Should overheating occur or the gas supply fail to shut off, turn off the gas supply at the manual gas shut off valve, on the gas line. Note: manual gas shutoff valve is not supplied with the heater but must be field installed. • 9. Do not use this appliance if any part has been underwater.
Appliance details | 11 3.5 Dimensions and minimum installation clearances Fig.
| Installation instructions WARNING: ▶ The water heater must be installed by a qualified installer in accordance with these instructions. If improperly installed, a hazardous condition such as explosion or carbon monoxide poisoning could result. Bosch Thermotechnology Corp. is not responsible for improperly installed appliances. Common installation practice is to first determine the venting/combustion air point of termination, then design the piping layout back to the heater. 4.
Installation instructions | 13 4.3.
| Installation instructions 4.3.2 Vent specifications Establish vent clearances that comply with the vent manufacturer's specifications and all applicable national/local codes. 4" Venting Venting specifications E x h a u s t I n t a k e Diam.
Installation instructions | 15 For this example, the maximum allowable combustion air pipe length is 10 feet. Calculation example for 4" venting: Exhaust System used Number of 90° elbows needed: Number of 45° elbows needed: Twin pipe 1 2 Table 15 Calculation of example Max. length 90° elbow reduction sub-total = 45° elbow reduction Total = 63’ - 2.5’ 61.5’ - 3’ 58.5’ Table 16 For this example, the maximum allowable exhaust pipe length is 58.5 feet.
| Installation instructions Required direct vent terminal clearances (twin pipe / concentric penetration) Fig. 9 Canadian installations1) U.S. installations2) A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. B Clearance to window or door that may be opened 36 in. 12 in.
Installation instructions | 17 Required other than direct vent terminal clearances (single pipe penetration) Fig. 10 Canadian installations1) U.S. installations2) A Clearance above grade, veranda, porch, deck or balcony 12 in. 12 in. B Clearance to window or door that may be opened 36 in.
| Installation instructions 4.3.3 Vent configuration examples Below are approved examples of vertical and horizontal venting installations. WARNING: ▶ Single pipe penetration should be used in nonfreezing climates only and steps must be taken to ensure that adequate combustion air is available to the water heater at all times! Fig. 13 Horizontal venting system (concentric vent) Fig. 11 Vertical venting system (single pipe penetration) [1] [2] [3] [LA] Drain tee Intake Exhaust Maintain 12 in. (18 in.
Installation instructions | 19 ▶ 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 accessory. Fig. 17 Inlet connection Fig.
| Installation instructions 4.3.6 Freeze prevention In cold climates, components of a tankless water heater can freeze and burst from negative draft. A leading cause of negative draft is combustion appliances in the building not being supplied with sufficient combustion air. A wood stove or furnace can pull its combustion air from the water heater‘s vent pipe, allowing the cold incoming air to freeze the cold water in the heat exchanger.
Installation instructions | 21 Fig. 22 [1] [2] [3] Good Better Best Fig.
| Installation instructions 4.3.7 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. Failure to make necessary adjustments to fan speed values may result in improper operation of the appliance.
Installation instructions | 23 ▶ Press ON/OFF button into ON. ▶ Press and hold simultaneously buttons + , seconds, until display reads P2. and P for 3 ▶ Press ON/OFF button into ON. ▶ Press and hold simultaneously buttons + , seconds, until display reads P2. and P for 3 Fig. 25 Fig. 24 ▶ Press P to enter P2 adjustment. The current setting will appear on the display (factory default). ▶ Press + or to choose the fan speed suitable with your installation, see table 21 and table 22.
| Installation instructions 4.4 Combustion air requirements CAUTION: ▶ In areas where outside temperatures routinely come close to freezing, sealed combustion operation is required. Use a concentric termination or separate terminations for combustion and vent, which must be installed on the same wall or roof surface, however never facing the direction of prevailing winds. Failure to do so may result in heat exchanger freezing up and bursting.
Installation instructions | 25 Front cover should be removed (see instructions on page 9) in order to inspect components visually. WARNING: ▶ Do not install this appliance on a carpeted wall. The heater must be mounted on a wall using appropriate anchoring materials. WARNING: ▶ In areas where outside temperature is routinely below 32°F and the heater is to be installed on the inside of an exterior wall, a minimum 2" air gap or rigid insulation between the heater back and the wall is recommended.
| Installation instructions 4.8 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. In Canada: The Installation must conform to CGA B149 INSTALLATION CODES and/or local installation codes.
Installation instructions | 27 4.8.1 Gas Line Sizing Tables for NATURAL GAS For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA 54. The tables below show the maximum capacity of the gas supply pipe in cubic feet per hour. Please contact your local gas supplier for the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/ cubic foot for rough estimations.
| Installation instructions 4.8.2 Gas Line Sizing Tables for LP GAS For your convenience see below for an excerpt from gas line sizing tables for a single LP appliance. Their intended use of is for pipe sizing between the 2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58. the combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
Installation instructions | 29 4.9 Water connections NOTICE: ▶ This heater is not approved for preheated water applications exceeding 140°F (60°C). NOTICE: ▶ In applications where inlet water temperature can exceed 140°F (60ºC), a 3-way valve or mixing valve must be installed before the appliance to prevent water exceeding 140°F (60°C) from entering the appliance. ▶ When facing the heater, the ¾ ” cold connection is on the bottom right and the hot connection is on the bottom left.
| Installation instructions ▶ Remove the clip and disconnect the drain tube, see fig. 35. Fig. 35 Disconnect drain tube ▶ Fill the condensate trap by pouring approx.14 oz. (400ml) of water into the top of the drain tube. To avoid damage to the appliance use a funnel in this operation, see fig. 36, page 30. Fig. 33 Plumbing Connections (with shutoff valves) and Pressure Relief Valve [1] 4.
Installation instructions | 31 ▶ Check water level in the condensate trap. commonly done. Contact Bosch Thermotechnology if further information is needed. 4.13 Space heating applications CAUTION: ▶ If the set point temperature is above 120°F, precautions should be taken to protect users of potable water from scalding. CAUTION: ▶ Propylene glycol may be used for freeze prevention ONLY on the space heating side of the heat exchanger. Do not use ethylene glycol (automotive antifreeze). Fig.
| Installation instructions C1210ES\ESC 70 60 Pressure (Feet of Head) 50 40 30 20 10 0 0.0 1.0 2.0 3.0 4.0 5.0 6720644887-01.1V Flow (GPM) Fig. 40 Pressure drop curve 8 18 13 17 T 5 7 12 22 16 15 1 11 21 14 9 5 20 9 10 2 3 6 9 5 4 6720644887-02.1V 19 Fig.
Electrical connections | 33 4.14 Measuring gas pressure Confirm gas pressure upon installation. Connecting manometer ▶ Shut off gas supply at installer supplied shutoff valve for this water heater. ▶ Remove front cover and locate inlet gas pressure test port (see Fig.43). ▶ Loosen screw inside left test point fitting (do not remove) and connect manometer tube to test point. Static Pressure Test ▶ Turn gas supply back on. ▶ Record static gas pressure reading in table 31.
| Operation instructions Note: Outlet appliance is plugged in to should be clear from possible water damage. 5.2 ▶ Check the fuses in the printed circuit board, see fig. 46, pos. 3. Position of the fuses in control unit 1 To check fuses, proceed as follows: ▶ Remove the front cover, see fig. 4, page 9. ▶ Remove the three screws from the control unit. 2 Fig. 45 ▶ Remove the six screws from the back cover of the control unit, see fig. 46, pos. 2. 3 6720608158-78.1AL Fig.
Operation instructions | 35 6.2 For your safety read before operating your water heater WARNING: ▶ If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Fig. 49 Temperature indicator A. This appliance is equipped with electronic ignition for lighting the main burner. When turning the heater on, follow these instructions exactly. WHAT TO DO IF YOU SMELL GAS ▶ Do not try to light any appliance.
| Operation instructions Setting the water temperature The desired temperature of the hot water can be adjusted on the front control panel of the heater. The water heater has an electronically controlled gas valve that modulates the burner input in response to both varying hot water flow rates and/or changes in any incoming and outgoing water temperatures. 6.5 Use of optional remote control accessory (part no.
Maintenance and service | 37 After following instructions indicated in “Troubleshooting” section, ▶ press reset button firmly in order to return heater to normal operation. 7 Maintenance and service WARNING: ▶ Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves whenever servicing. NOTICE: ▶ Check and clean the complete water heating system once a year. ▶ Carry out a maintenance overhaul if necessary.
| Maintenance and service instructions on descaling the heat exchanger. Fin Coils • Inspect heat exchanger fincoil for soot build-up or blockage. To access fincoil, consult service bulletin at www.boschheatingandcooling.com. If there is evidence of soot build-up or blockage, the heat exchanger should be removed by a professional and cleaned thoroughly. Condensate trap • Check water level in the condensate trap, see fig. 34.
Maintenance and service | 39 Condensing heat exchanger unit maintenance; ▶ Shut off power. Disconnect power cord. ▶ Dismantle all inlet, outlet pipes and the condensate tube from the condensing heat exchanger unit. ▶ Remove the condensing heat exchanger unit from the appliance by pulling it towards you. ▶ Dismantle all parts for inspection and cleaning. The P1 minimum operating gas pressure is 3.5" WC for Natural Gas and 8" WC for Propane.
| Maintenance and service CO2 range (%) Max. CO level (measured) LP Gas max. input P1 9.9 % - 10.5 % < 290 ppm min. input P2 2.5 % - 2.8 % < 60 ppm * Values above are for climate controlled conditions. Inputs such as gas pressure, heating value of the gas, humidity and temperature of combustion air all impact CO and CO2 values. Changes in these inputs can result in different CO and CO2 values on the same appliance. Table 34 CO2 & CO target numbers C.
Maintenance and service | 41 7.6 Program values This section describes details on programming the appliance. For most applications the factory default values will provide robust and stable operation. Only adjust the factory settings if the installation requires changes as indicated in the appropriate section of this manual. Refer to chapter 7.7 Control board diagnostics (page 42) regarding how to access these P-modes.
| Maintenance and service 7.7 Control board diagnostics 1. Press ON/OFF button into ON. 2. Press and hold simultaneously buttons + , and P for 3 seconds, until display reads P2. 3. Press P to enter P2 adjustment. The current setting will appear on the display. If not, repeat process. 4. Press and release the P button on the control panel until the display reads 'P4'. You are now in the diagnostic mode of the control board. 5.
Troubleshooting | 43 8 Troubleshooting WARNING: ▶ If you are unable to perform the tasks listed below, or need additional assistance please contact a qualified gas technician. 8.1 Introduction Many of the questions customers ask regarding operation of this unit can be answered by following the troubleshooting steps as outlined below. Visit our web site at www.boschpro.com for more detailed troubleshooting. For best results, perform each step before proceeding to the next.
| Troubleshooting 8.6 Hot water temperature fluctuates at tap 1. Hot water is very hot out of the water heater, requiring mixing in cold water in order to attain a usable hot water temperature. The addition of too much cold will overpower hot water flow from the tankless water heater. If this slows the flow through the tankless water heater below its activation point, it will shut off the burners. The end result is nothing but cold water coming out of the outlet. Consult www.boschheatingandcooling.
Problem solving | 45 9 Problem solving 9.1 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. 76, page 52). Go to steps two Temperature above 230°F (110 °C) inside and three to determine flue gas limiter fault and repair it. the cabinet. 2.
| Problem solving Display Cause Solution (Flashing) Water flow signal over specified maximum value. Water flow > 10 gallon/min. (Status message). 1. Disconnect power supply cord and check wire connections on water valve and the two connectors on the control board, see fig. 83, page 60. 2. Excessive water pressure and flow. Ensure water pressure is less than 150psi and flow rate is below 10 gallons per minute. Over-temperature detected by outlet temperature sensor. Temperature > 185°F 1.
Problem solving | 47 Display Cause Solution No flame ionization detected with water flow. 1. Verify that all manual gas shut off valves are open. 2. Check gas type. See fig. 2, page 9. 3. Reset error code and open a water tap to cycle the heater in an effort to purge air. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater. 4.
| Electrical diagram 10 Electrical diagram Fig.
Sensor resistance charts | 49 11 Sensor resistance charts Fig. 72 Outlet sensor characteristics Fig.
| Sensor resistance charts Fig.
Functional scheme | 51 12 Functional scheme IDLE Water flow > 0.5 gpm (> 1.9 l/min) (see WF calc.) water tap open? See error code table NO YES Fan speed = correct Ionization = off Temp. limiter = closed Temp. sensors = ok Over heat protection = ok Appliance ready to start? YES Fan speed OK? NO NO NO waiting time of 10s passed? YES YES Start sparking Open the gas valve INPUTS: - FANSPEED - WATER TEMP.
| Interior components diagram and parts list 13 Interior components diagram and parts list 13.1 Interior components Fig.
Interior components diagram and parts list | 53 Fig.
| Interior components diagram and parts list 13.2 Components diagram 13.2.1 Group 1 Fig.
Interior components diagram and parts list | 55 13.2.2 Group 2 Fig.
| Interior components diagram and parts list Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 30 31 32 33 34 35 Description Reference Heat exchanger Heat exchanger top gasket Condensing exchanger inlet Overheat sensor (ECO) Heat exchanger bottom gasket Site window Ignition group Heat exchanger O-ring Rubber grommet Connecting pipe Pipe connection clip Condensing exchanger gasket Condensing exchanger nut Condensing heat exchanger Condensing exchanger left side Condensing
Interior components diagram and parts list | 57 13.2.3 Group 3 Fig.
| Interior components diagram and parts list 13.2.4 Group 4 Fig.
Interior components diagram and parts list | 59 13.2.5 Group 5 Fig.
| Interior components diagram and parts list 13.2.6 Group 6 Fig. 83 Components Diagram Item 1 1 2 3 4 5 6 7 9 Description Reference Control unit - C 1210 ES Control unit - C 1210 ESC Fuse T2.5A Fuse T1.
Protecting the environment | 61 14 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. Saving water resources: ▶ Make sure you close all the taps after any use. Avoid leaving the taps dripping. Repair any leaking tap.
| Notes 6 720 644 887 (2017/05) C 1210 ES/ESC
| 63 Notes C 1210 ES/ESC 6 720 644 887 (2017/05)
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