Installation and Operating Instructions INDOOR RESIDENTIAL TANKLESS WATER HEATERS Greentherm T9900 SE 160/199 | i 199 160 000/199 000 Btu- Natural Gas | 160 000/199 000 Btu - Liquefied Petroleum (LP) Gas 6 720 813 635 (2022/01) US WARNING! 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 Safety information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 6.5 Information /Adjustments menu. . . . . . . . . . . . . . 48 6.5.1 “P4” - Information . . . . . . . . . . . . . . . . . . . . . . . . . 48 6.5.2 SA - Settings . .
Key to symbols and safety instructions 1.2 1 Key to symbols and safety instructions 1.1 Key to symbols Warnings In warnings, signal words at the beginning of a warning are used to indicate the type and seriousness of the ensuing risk if measures for minimising danger are not taken. The following signal words are defined and can be used in this document: DANGER: DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.
Key to symbols and safety instructions H DANGER: Risk of explosion! If you smell gas ▶ Turn off the gas shut-off valve. ▶ Open windows and doors. ▶ Do not try to light the appliance. ▶ Do not touch any electrical switch, telephone, and do not use outlets. ▶ Extinguish all open flames. Do not smoke! Do not use lighters! ▶ Warn all occupants of the building. Do not ring doorbells! ▶ If you can hear gas leaking, leave the building immediately.
Key to symbols and safety instructions H WARNING: Never shut off safety valves! ▶ Water may escape from the safety valve at any time when the water is being heated. H WARNING: Inspection/maintenance ▶ Servicing and repairs may only be carried out by a trained and certified installer. ▶ Immediately correct all faults to prevent system damage. ▶ Use only Bosch spare parts! H CAUTION: Instruct the customer ▶ Explain to the customer how the appliance works and how to operate it.
Key to symbols and safety instructions ▶ Water exiting from drain valves can be extremely hot. To avoid injuries: – Check that all connections are tight. – Direct exiting water away from people. ▶ Measures must be taken to protect against excessive temperature and pressure! Installation of a T&P safety valve is required.
Key to symbols and safety instructions NOTICE: DANGER: Fatal accidents! Carbon monoxide poisoning. ▶ Carefully plan where you install the heater. Correct combustion air supply and flue pipe installation are very important. If a gas appliance is not installed correctly, fatal accidents can result such as carbon monoxide poisoning or fire.
Safety information NOTICE: 2 Safety information Appliance damage! ▶ Label all wires prior to disconnection when servicing controls. Wiring errors can result in improper and dangerous operation. Verify proper operation after servicing. WARNING: Relief valve discharges! ▶ If a relief valve discharges periodically, this may be due to thermal expansion in a closed water supply system. Contact the water supplier or local plumbing inspector on how to correct this situation. Do not plug the relief valve.
Appliance details The chart below shows the relationship between water temperature and time until there is a risk of scalding. It can be used as the basis for determining the safest water temperature for your application. Temperature Time to severe scalding1) 120 °F (49 °C) longer than 5 minutes 125 °F (51 °C) 1.5 to 2 minutes 130 °F (54 °C) approx. 30 seconds 135 °F (57 °C) approx. 10 seconds 140 °F (60 °C) less than 5 seconds 145 °F (62 °C) less than 3 seconds 150 °F (65 °C) approx. 1.
Appliance details 3.2 Specifications (Technical data) Approved in US/Canada Technical characteristics Units Greentherm T9900 SE/i Greentherm T9900 SE 199 000 Btu 160 000 Btu Capacity Maximum flow rate at a 35 °F (19.4 °C) rise1) GPM (l/min) 11.2 (42.4) 9 (34) Maximum flow rate at a 45 °F (25 °C) rise GPM (l/min) 8.7 (32.9) 7(26.7) Maximum flow rate at a 55 °F (30.6 °C) rise GPM (l/min) 7.2 (27.5) 5.8 (21.9) Maximum flow rate at a 75 °F (41.7 °C) rise GPM (l/min) 5.2 (19.7) 4.2 (15.
Appliance details Technical characteristics Gross weight Units Greentherm T9900 SE/i Greentherm T9900 SE 199 000 Btu 160 000 Btu pounds (kg) 91.05 (41.3) / 93.48 (42.4) 86.64 (39.3) Electrical Nominal V AC 120 120 Frequency Hz 60 60 Amperage (Idle) mA 40 40 Operation A ≤ 2,7 ≤ 2,7 Water protection9) IP X4D X4D 1) These flow rates are based upon setting the unit to higher temperatures and then mixing down using cold water after the unit.
Appliance details 3.3 Unpacking the heater The heater is default-set by the manufacturer to operate with Natural Gas, for use with Liquid Propane, follow the conversion instructions in section 6.8.1. Before starting up the heater for the first time, be certain you have the heater correctly set 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 left side (when facing appliance front) of the cover.
Appliance details ▶ Slowly open the front cover [1]. Fig. 4 Open front cover ▶ Disconnect the wire from the HMI (display) [2]. ▶ Lift the front cover to remove from the appliance. ▶ Install the appliance so that it hangs vertically. 3.4 General rules to follow for safe operation H Warning: Safety Rules! 1. You must follow these instructions when you install your heater.
Appliance details 6. Keep the water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material which might burn. 7. Correct gas pressure is critical for the proper operation of this heater. Gas piping must be sized to provide the required pressure at the maximum output of the heater, while all the other gas appliances are in operation. Check with your local gas supplier, and see the section on connecting the gas supply. See chapter 4.8 (page 33). 8.
Appliance details 3.5 Fig.
Installation instructions ▶ Improper operation. ▶ Loss of warranty. DANGER: ▶ 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 path and method of venting, then design the piping layout. 4.3 Fig.
Installation instructions WARNING: 4.5 Hanging appliance on the wall WARNING: ▶ Flammable materials, gasoline, pressurized containers, or any other items or articles that are potential fire hazards must NOT be placed on or adjacent to the heater. The appliance area must be kept free of all combustible materials, gasoline and other flammable vapors and liquids.
Installation instructions 1. 2. 6720813634-28.1V Fig. 7 Distance between support boards Fig. 9 [1] Support boards Vertical studs are typically 16" (406mm) on center. Mounting the heater CAUTION: Personal injury and property damage. ▶ Appliance must be installed vertically. 4.6 Venting DANGER: Flue gas poisoning! ▶ Do not reduce the exhaust or combustion air vent pipe sizes. ▶ Do not common vent with any other vented appliance or stove.
Installation instructions NOTICE: ▶ Installations resulting in negative pressure/back draft require sealed combustion (twin pipe / concentric). Damage caused from back draft, ie. freezing, are not covered by warranty. Do not cover non-metallic vent pipe and fittings with thermal insulation, unless going through an insulated wall or ceiling. Flue temperature: NOTICE: Appliance malfunction! ▶ Protect the inlet air supply from leaves and debris by installing a screen on the intake of the termination.
Installation instructions Vertical 2" Bird screen 3" Bird screen 4" Bird screen h h 2 - - 2", 3", and 4" SCH40 (Solid Core) PVC/CPVC 45° long sweep elbow h h 2.5 - - 2", 3", and 4" SCH40 (Solid Core) PVC/CPVC 45° short sweep elbow h h 2.
Exhaust: 0 Intake: 5 IPEX 081216 081219 2" PVC Wall Termination Kit 3" PVC Wall Termination Kit h Exhaust: 15 Intake: 7.5 Equivalent Lengths (Ft.
Duravent 810009692 (2" x 4") Black PP Vertical Termination Kit - Concentric M&G 810009720 (3" x 5") Black PP Vertical Termination Kit - Concentric 810009693 (2" x 4") Terra-Cotta PP Vertical Termination Kit - Concentric 810009721 (3" x 5") Terra-Cotta PP Vertical Termination Kit - Concentric Equivalent Lengths (Ft.
Installation instructions 4.6.3 Vent specifications 1) Do not exceed the maximum length allowance for either pipe by combining them. CAUTION: Risk of CO poisoning! An improperly sized venting system may lead to undesired effects such as the formation of condensate, gas leakage or spillage. Establish vent clearances that comply with the vent manufacturer's specifications and all applicable national/local codes. 2) To assure maximum heat input at maximum vent length minimum gas pressure should be 5" W.C.
Installation instructions Required direct vent terminal clearances (twin pipe / concentric penetration) Fig. 10 A Clearance above grade, veranda, porch, deck or balcony B Clearance to window or door that may be opened Canadian installations1)2) with direct vent terminals 12 in. (30cm) 36 in. (91cm) C Clearance to permanently closed window * D Vertical clearance to ventilated soffit located above the terminal within * a horizontal distance of 2 ft (61cm) from the center line of the terminal.
Installation instructions L Clearance above paved sidewalk or paved driveway located on public property M Clearance under veranda, porch deck or balcony Canadian installations1)2) U.S. installations2)3) with direct vent terminals with direct vent 7 ft (2.13m)4) * 12 in. (30cm) 5) * 1) In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code. 2) In accordance with the current ANSI Z223.1 / NFPA 54, National Fuel Gas Code.
Installation instructions Required other than direct vent terminal clearances (single pipe penetration) Fig. 11 A Clearance above grade, veranda, porch, deck or balcony. B Clearance to window or door that may be opened. Canadian installations1)2) with non direct vent 12 in. (30cm) 36 in. (91cm) U.S. installations2)3) with non direct vent terminals 12 in. (30cm) 48 in. (1.2 m) below or to side of opening; 12 in.
Installation instructions K Clearance to mechanical air supply inlet Canadian installations1)2) U.S. installations2)3) with with non direct vent non direct vent terminals 6 ft (1.83 m) 36 in. (91cm) above if within 10 ft (3m) horizontally L Clearance above paved sidewalk or paved driveway located on public property 7 ft (2.13m) 4) * M Clearance under veranda, porch deck or balcony 12 in (30cm) 5) * 1) In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.
Installation instructions 4.6.4 Recommended Vent Configuration Examples Below are approved examples of vertical and horizontal venting installations. NOTICE: Using a single pipe vent in cold climates puts the water heater at risk of freezing, as negative air pressure is common in buildings during cold weather. This situation will pull cold air through the heat exchanger and can lead to damage and a water leak and is not covered by the product's warranty.
Installation instructions Fig. 16 Fig. 15 Horizontal venting installation air intake piping not shown) Horizontal venting system (sealed combustion) [1] Intake [2] Exhaust [1] [2] [3] [4] Termination Water heater Elbow Horizontal run should slope ¼" per foot upwards to water heater [LA] 12 inches (305 mm) (18 in.
Installation instructions With Flex Pipe the maximum length is reduced by 60%, (applies only to the section in flex PP). Example: 10 feet of flex PP is equivalent to 25 feet of rigid PP. Flex Pipe according to the suppliers instructions is for use in the vertical part of the installation only. 4.6.5 Connecting the condensate water drain NOTICE: Risk of condensate pipe freezing! ▶ Do not install condensate drain tubing in areas where it may freeze. Appliance condensate drain installation Fig.
Installation instructions Installation NOTICE: A blocked breather may cause an undesired double-siphon effect. ▶ Ensure that the vacuum relief opening included in the siphon is not obstructed (for example with pipe dope) to allow correct function. Verify condensate disposal/neutralization is in accordance with federal, State, and local regulation. This is a high efficiency appliance, condensate flow can be as much as 2.1 gal/hr at full power.
Installation instructions Air combustion DANGER: The lack of adequate air openings may lead to improper operation due to other appliances consuming required air. ▶ Always follow local codes and regulations of authority having jurisdiction in case of single pipe installation in confined spaces. Fig.
Installation instructions Louvers, grills and screens have a blocking effect, when used, increase the sizes of your openings by 300% for wood louvers (as wood type will reduce the free air by 75%) and 43% for metal louvers (as metal will reduce the free air by 30%). Refer to the National Fuel Gas Code for complete information. 4.7 Factory settings DANGER: Explosion hazard! ▶ DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.
Installation instructions Fig. 25 [1] [2] [3] [LA] Gas connection Shut off valve Gas supply Cap Minimum 3" sediment trap, (drip leg) 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: Explosion hazard! ▶ If you detect a gas leak, shut off the gas and ventilate the room (open windows, doors).
Installation instructions GAS LINE SIZING The gas supply piping for a single heater should be sized for a maximum draw of 199000 BTU/hr for Greentherm T9900 SE/i. Measure the length of the gas supply line from the building's gas main to the heater and use the chapter 4.8.1 and 4.8.2 or the gas line manufacturer’s sizing tables to determine the pipe diameter necessary.
Installation instructions 4.8.2 Gas Line Sizing Tables for LP GAS For your convenience, see below an excerpt from gas line sizing tables for a single LP appliance. Their intended use is for pipe sizing between the 2nd stage (low pressure) regulator and the appliance. For details, see the current NFPA 54 or NFPA 58. Required input for 160000 / 199000 BTU/hr for the Greentherm T9900 SE/i.
Installation instructions 4.9 Water quality Water quality can have an impact on appliance longevity. Water supplied to the Greentherm T9900 SE/i must be in accordance with table 17 and fig. 26. For water analysis data call your local water department, or if on a well, have well water analyzed periodically. Heavy scale will form if the combination of water total hardness and pH exceeds the values specified in fig.
Installation instructions NOTICE: ▶ This heater is not approved for preheated water applications exceeding 140 °F (60 °C) for Residential appliances, in these cases use a 3-way valve or mixing valve must be installed before the appliance to prevent water exceeding 140 °F (60 °C) for Residential appliances from entering the appliance. ▶ When facing the heater, the ¾" cold connection is on the top right and the hot connection is on the top left.
Installation instructions 4.11 Domestic hot water recirculation 4.11.2 Recirculation options The following drawings are provided to illustrate two possible recirculation designs. These schematic is for illustration only and must not be used for actual Installation without appropriate engineering and technical advice from a properly licensed professional in the locality where the installation is made.
Installation instructions • Cross Over Mode Cross over mode requires two (2) Grundfos thermal by-pass valves or one (1) AquaMotion AMK-ODR valve. Tank loading This recirculation option gives the option of using one of three temperature sensors to control the recirculation option. The scheduling option is not available for tank loading. • External NTC - 7 736 504 583 – Only compatible with Bosch cable/sensor accessory (7736504583).
Installation instructions NOTICE: ▶ The use of a flow switch is recommended to ensure DHW priority and to prevent “cold-blow” situations when the Bosch tankless water heater is used with an air handler. Air handler installation must include a pump. The flow switch should be used to disable the blower on the air-handling system when domestic water is used. NOTICE: ▶ Ensure the primary pump is properly sized to provide adequate flow for the system heat load.
Installation instructions Fig.
Installation instructions Fig.
Electrical connections 4.13 Measuring gas pressure output or possible error codes and must be corrected. See Gas Connections, chapter 4.8, page 33. 4.13.1 Gas supply pressure Confirm gas pressure upon installation. Connecting manometer ▶ Shut off gas supply at installer supplied shutoff valve for this water heater. ▶ Locate the inlet gas pressure test port (see Fig. 35). ▶ Loosen the screw inside test port fitting (do not remove) and connect the manometer tube to the test port (see Fig. 35). Fig.
Operation instructions The water heater is wired as shown in the wiring diagram (chapter 10, Fig. 67). ▶ Check the fuse in the printed circuit board, for electrical continuity, see fig. 38, [1]. Fig. 36 Fig. 38 Connecting power supply cord Fuse position [1] Power cord length: 5.9 ft (1.8m). [1] Fuse Note: The power supply that the appliance is plugged into should be isolated from possible water damage. Observe proper clearance to avoid damages.
Operation instructions 6.1 For your safety read before operating your water heater WARNING: ▶ Touch and hold symbol for more than 3 sec. The LCD display shows the selected temperature. When the burner is on, the display shows symbol (Fig. 39, [7]). Explosion hazard! ▶ If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
Operation instructions 6.4.1 Programming the default setpoint temperature To increase setpoint temperature limit of the appliance, ▶ Access the menu LM - Temperature Limited ( Section 6.6) and select Unlocked. A lower temperature set point will reduce the risk of scalding, reduce energy consumption and increase the longevity of the heat exchanger. 6720813761-06.1V Fig. 43 “Program” key ▶ Touch the symbol or to select the desired temperature.
Operation instructions 6.5 Information /Adjustments menu Access to Information / Adjustments menu Display shows the set point temperature. ▶ Touch the symbol . Display shows P4 Information. ▶ Touch symbols or to scroll through the available menus. Available menus Display Description P4 Information (section 6.5.1) SA Settings (section 6.5.2) AU Technical Settings [service mode] (section 6.5.3) P9 Purge (section 6.5.4) Table 23 6.5.
Operation instructions ▶ ▶ ▶ ▶ ▶ ▶ Touch the symbol when month is correct. Use the symbols or to set the day. Touch the symbol when the day is correct. Use the symbols or to set the year. Touch the symbol when the year is correct. Touch the symbol to exit the Date menu. Clock and Date are defined. ▶ Touch the symbol , the Hours and Clock blink 3 times and exit menu. Fig. 45 SA - Settings A1 Recirculation This menu provide access to several parameters.
Operation instructions ▶ Use the symbols or to select the day of the week to be copied. ▶ Use the symbols or to choose option Copy to. ▶ Touch the symbol . Display shows week days. ▶ Touch the symbol to select the day of the week. ▶ Use the symbols or to choose another week day. When week days are selected, ▶ Touch the symbol to validate operation. ▶ Touch the symbol to exit. Deleting a recirculation program, ▶ Use the symbols to be deleted.
Operation instructions ▶ Use the symbols or to select A8 Startup Delay. ▶ Touch the symbol . Display shows Startup Value(s). ▶ Touch the symbol . ▶ Touch the symbols or to define, in seconds, the delay to start-up after detection of the water flow. ▶ Touch the symbol after reaching the desired value. ▶ Touch the symbol after reaching the desired value. The time is defined, the brightness value must now be programmed. ▶ Use the symbols or to set the brightness of the display when in period of inactivity.
Operation instructions ▶ Touch the symbol until the display shows P9 Purge. After 2 sec. the fan starts working to purge the exhaust circuit. The fan remains running until the Purge menu is exited, to do so: ▶ Touch the symbol 6.6 . Service menu - AU Technical Settings Accessing the AU Technical Settings menu ▶ Touch the symbol . Display shows P4 Information. ▶ Touch symbols or to select AU Technical Settings menu. ▶ Touch the symbol . Display shows authentication menu (password input).
Operation instructions 6.7 PF Bypass Activation Water valves calibration To Enable or Disable bypass function. ▶ Touch the symbol . Display shows following menu. – Off – On The current selection is in green color. ▶ Touch symbols ▶ Touch the symbol ▶ Touch the symbol or to select the desired option. . to return to main menu. PE Appliance Type Water valve calibration must be done when main water valve or bypass valve is replaced. Also required when electronic control unit is replaced.
Operation instructions ▶ Touch symbol OK. The appliance will start the auto calibration of the bypass valve. ▶ Remove the four screws that retain the cover plate to the gas manifold, see fig. 48 (plate in grey color). The display shows the flow rate. ▶ You should adjust the flow rate at the beginning of the calibration process. ▶ Wait for the indication that the calibration is completed to appear on the screen. ▶ Touch the symbol 6.8 to return to main menu. Gas type Fig.
Operation instructions 6.9 Wi-Fi connection Only available in T9900 SEi model. For T9900 SE160/199 models, a wireless connectivity accessory is available with WiFi accessory module. 6.9.1 Wi-Fi activation Before activating Wi-Fi module, ▶ Unplug the appliance from the power supply. The Wi-Fi module must be activated within 60 minutes after plugging in the appliance to the power supply. If an error message is displayed or cannot configure Wi-Fi menu. ▶ See section 6.9.
Operation instructions ▶ Use the symbols or to select the letters and symbols from the list. ▶ Touch the symbol , to confirm each letter or symbol. ▶ To save the password use the symbols or to select END. ▶ Touch the symbol . ▶ Touch the symbol to return to main menu. Display shows temperature value. Appliance is connected to a network. ▶ Download the “Bosch Water” app, available for Android and IOS for communication with the water heater, see fig. 52. ▶ Open the app and follow the instructions.
Operation instructions ST Status Display shows the status of wireless connection: • connected • disconnected • hotspot If HMI is connected to a wifi network, display shows the wireless connection name. DI Disconnect ▶ Choose DI Disconnect. ▶ Choose the symbol . Display shows, Are you sure? – Yes – No ▶ Choose Yes. A green check mark is displayed indicating that the appliance is disconnected from the network. ▶ Repeat Wi-Fi activation process, see section 6.9.1 "Wi-Fi activation".
Maintenance and service 7.1 7 Maintenance and service Required annual maintenance (To remove front cover, see page 12) DANGER: WARNING: ▶ Always shut off the electrical power supply, shut off the manual gas valve and shut off the water valves before servicing. Maintenance must be done by a qualified contractor. Venting System DANGER: NOTICE: Risk of explosion! Venting system blocked! ▶ Replace all dismantled seals and o-rings with new ones.
Maintenance and service shorten the life of the water heater and damage resulting from scale is not covered under warranty. Refer to section 7.3 for detailed instructions on descaling the heat exchanger. Condensate Siphon • Check for debris and clean if needed. Air Filter • • Verify if the air filter is clean and undamaged. The air filter is attached to the fan assembly, see fig. 54. Air filter must be cleaned or replaced in case it is clogged or damaged.
Troubleshooting error codes of AA, E3, A5 and boiling sounds in the heat exchanger. A water softener is required if the water hardness exceeds 12 grains/gal (200 mg/l) calcium carbonate. Damage to the water heater resulting from hard water/scale deposits will not be covered under warranty. ▶ Reconnect the electrical supply to the unit, open the water shutoff valves, and return the unit to service. Descaling using a pump ▶ Disconnect the electrical supply from the water heater.
Troubleshooting 8.2 Burner does not ignite when a hot water faucet is opened It is recommended to use “P4 Information” page 48, chapter 6.5.1 as a tool for problem solving. 1. If the display is blank, verify power at the outlet. (120VAC/ 60Hz properly grounded circuit required). Confirm power to the heater. Check all wire connections including plugged connectors. 2. Verify the fuse in the control board is good. To access the fuse, the control board must be removed. See chapter 5.2, page 45. 3.
Troubleshooting 5. In areas where the water has a high mineral content, periodic descaling may necessary. See chapter 7.3, page 59 for directions. 8.6 Hot water temperature fluctuates at faucet 1. If the water heater set point temperature is high, mixing at the faucet could deactivate the water heater. The addition of too much cold will overpower hot water flow from the tankless water heater reducing its flow below the activation point.
Troubleshooting 2. How to verify the recirculation flow. Close all water faucets, access to information menu, P4 information > Operation Data, choose the option Flow. The value should be above 1 GPM (4 l/min). 3. If the appliance doesn’t make the recirculation.
Troubleshooting Access to CA Combustion Adjust menu is only possible after accessing to AU Technical Settings menu ( section 6.6). After enter AU Technical Settings menu, ▶ Touch symbols or to select CA menu. Display shows CA Combustion Adjust. ▶ Touch the symbol to enter CA menu. • • • ▶ Open hot water taps when the display shows Open Taps. This message will appear approximately 5 minutes after initiate the automatic adjustment.
Troubleshooting 8.12.2 Manual Gas and Air Adjustment Gas and Air adjustment is also possible to perform manually. This is only recommended if the automatic adjustment process is not possible to complete successfully. ▶ Change L1 Gas Adjust parameter until power reaches 100% ± 2% ▶ Increase L1 Gas Adjust parameter to increase output power, and vice-versa. To perform MA Manual Adjust of Gas/Air flow; ▶ After enter CA Combustion Adjust menu, ▶ Touch symbols or to select MA menu.
Troubleshooting B1 Internal Adjust ▶ Touch symbols Adjust. or until display shows B1 Internal ▶ Increase L2 Gas Adjust parameter to increase ION ratio and vice-versa. Fig. 66 Fig. 64 B1 Internal Adjust - P1 Active ▶ Touch the symbol to enter B1 Internal Adjust.1) B1 Internal Adjust will start automatically. ▶ Wait approximately 60 seconds until a green check mark appears in the display, which indicates that the B1 Internal Adjust is completed. Do not interfere with the appliance during this period.
Troubleshooting 8.12.4 Additional combustion settings The parameters and operation modes presented in this section are available for certification purposes and advanced troubleshooting with guidance from BOSCH support line. For optimal operation, use the default settings. IC - Ionization control Default setting is On. ▶ Only a qualified technician can change this parameter. PD Power derate Default setting is On. ▶ Only a qualified technician can change this parameter.
Problem solving 9 Problem solving 9.1 Error code diagnostics To remove error codes from the display, ▶ Touch the On/Off button more than 3 sec. (long press). Installation, maintenance and repair must only be carried out by qualified contractors. The following table describes the solutions for possible problems. Display Description Solution A0 Water temperature sensors [17] [19] [20] disconnected or damaged. ▶ Check sensor wire connections.
Problem solving Display Description AA3) ▶ Check flue gas temperature sensor. Condensing unit flue gases temperature [16] above 392 °F (200 °C) and/or flue gases ▶ Check water inlet temperature sensor. temperature [15] above 145 °F (63 °C) at the ▶ Descale appliance ( section 7.3). 1) exhaust sensor [15]. Appliance regulates power to protect against overheating. AD Flue blockage detected during startup due to insufficient combustion air. Appliance power derate and possible reduction of comfort level.
Problem solving Display Description Solution C9 Barometric pressure sensor damaged. ▶ Reset error (touch and hold on/off button for 3 seconds). If the problem persists: ▶ Replace electronic control unit (ECU). 1) CA Water flow above 9.2gpm. ▶ Disconnect the appliance and purge hydraulic circuit to remove air.1) ▶ Install water flow restrictor.1) ▶ Check water pressure does not exceed 150psi (section 3.2).
Problem solving Display Description Solution E4 Air temperature inside cabinet above 176 °F (80 °C) or 2 minutes above 158 °F (70 °C). Appliance burner cut off to prevent overheating. ▶ Check for flue gas leakage inside the cabinet or concentric vent.1) ▶ Reset error (touch and hold on/off button for 3 seconds). If the problem persists: ▶ Check sensor resistance [18] (section 11) and replace the sensor if it is not according to specification.
Problem solving Display Description Solution F3 Electronic control unit internal error. ▶ Reset error (touch and hold on/off button for 3 seconds). If appliance’s configuration is required: ▶ See section 6.6 to configure appliance (region, power, type and gas type) and perform an automatic combustion adjustment according to the section 8.12.1) If the problem persists: ▶ Replace electronic control unit.1) F7 Electronic control unit internal error.
Problem solving 4) Error reset also possible by shutting-off water flow to the unit, and turning it back on, limited to 3 times per hour. It can take up to 3 minutes for appliance initialization. Table 26 Note: If the appliance is locked for safety reasons, information is shown on the display to give more information on the problem. Once the problem is solved, you may have to reset the error (touch and hold button for 3 seconds). Error reset will only take effect if error is visible on the display.
Electrical diagram 10 Fig.
Electrical diagram [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] Ionization sensor Fan Ignition electrode Power supply Connection for anti freeze kit Connection for recirculation pump Connection for remote control Gas valve - Modulation Water bypass valve Electrovalve 3 Electrovalve 1 Electrovalve 2 Gas valve - Solenoide safety Thermofuse Water flow sensor Exhaust temperature sensor Exhaust temperature sensor - Between chambers Water out
Sensor resistance charts (70) 248 230 212 194 176 158 140 (50) (60) 122 104 86 50 (20) (30) (40) (10) -4 14 32 -40 TEMPERATURE ºF (ºC) (-40) (-30) (-20) (-10) (0) 1 0.1 10 100 RESISTANCE (KOHM) 6720816948-40.1V 464 428 392 356 320 284 248 212 176 140 104 68 -4 -40 32 (100) (120) (140) (160) (180) (200) (220) (240) (80) (-20) (-40) (0) (20) (40) TEMPERATURE ºF (ºC) Inlet, outlet and heat exchanger water temperature sensors characteristics (60) Fig.
Interior components diagram 12 Interior components diagram 12.1 Interior components Fig.
Protecting the environment 13 Protecting the environment Packing 14 Installer Checklist to be completed by installer upon installation 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.
Installer Checklist to be completed by installer upon installation Checklist to be completed by installer Condensate Yes No Chapter Condensate drain line installed with neutralizer Condensate drain pitched to a drain or to a condensate pump Condensate protected from freezing Electrical power Yes No 120 VAC with ground 3.2 Gas supply Yes No Chapter Shutoff installed on gas supply line 3.2; 4.8; 4.
List of used Open Source Components 15 List of used Open Source Components The following open source software (OSS) components are included in this product: Name of OSS Component Version of OSS Component Name and Version of License (License text can be found in Appendix below) More Information Arphic Technology 1.3.0 Arphic Public License See chapter 15.1 Copyright (C) 1999 Arphic Technology Co., Ltd. SIL International 1.000 SIL Open Font License 1.1 See chapter 15.
List of used Open Source Components parties remain in full compliance. Acceptance You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to copy, modify, sublicense or distribute the Font. These actions are prohibited by law if you do not accept this License. Therefore, by copying, modifying, sublicensing or distributing the Font, you indicate your acceptance of this License and all its terms and conditions.
FCC Regulatory notices unmodified copies of the Font Software, subject to the following conditions: 1. Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself. 2. Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license.
United States and Canada Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel. 603-552-1100 Fax 603-965-7581 www.boschheatingandcooling.com U.S.A. Products manufactured by Bosch Thermotechnik GmbH Junkersstrasse 20-24 D-73249 Wernau www.bosch-thermotechnology.com Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.
