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Bosch Optiflow GWH16 3 CT E23 F6 L S2405 Installation Manual

Gas continuous flow water heaters
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Gas continuous flow water heaters
Optiflow
GWH16/20/26 3 CT E23/31 F6 L S2405
Installation Manual
Read installation manual prior to installation of this appliance!
Read user manual before putting this unit in operation!
Observe the warnings in the manuals!
The installation location must meet the requirements for sufficient ventilation!
Installation by an authorised person only!
6720817545-00.1V

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  Summary of Contents for Bosch Optiflow GWH16 3 CT E23 F6 L S2405

  • Page 1 6720817545-00.1V Gas continuous flow water heaters Optiflow GWH16/20/26 3 CT E23/31 F6 L S2405 Installation Manual Read installation manual prior to installation of this appliance! Read user manual before putting this unit in operation! Observe the warnings in the manuals! The installation location must meet the requirements for sufficient ventilation! Installation by an authorised person only!
  • Page 2: Table Of Contents

    2 | Index Index 5.3.2 Adjusting the maximum flow Key to symbols and safety instructions ..3 (Parameter P1) ..... .15 Key to symbols .
  • Page 3: Key To Symbols And Safety Instructions

    • CAUTION indicates a situation that could result in minor to responsibility of the property owner. medium injury. ▶ Use only genuine Bosch spare parts. • WARNING indicates a situation that could result in severe Explosive and flammable material injury or death.
  • Page 4 4 | Key to symbols and safety instructions Regulations All gas appliances require adequate air intake All local by-laws and regulations pertaining to installation and to ensure correct combustion. Insects and use of gas appliances must be observed. dirt ingress may affect combustion causing This appliance must be installed in accordance with the sooting.
  • Page 5: Product Details

    Product details | 5 “This appliance can be used by children of 8 years and older, as maintenance must not be performed by children without well as by people with reduced physical, sensory or mental supervision.” capabilities or lacking in experience and knowledge, if they are “If the power cable is damaged, it must be replaced by the supervised and have been given instruction in the safe use of manufacturer, its customer service department or a similarly...
  • Page 6: Dimensions And Minimum Clearances

    6 | Product details Dimensions and minimum clearances >10 >10 6720817545-02.1V Fig. 1 Dimensions (in mm) Connections Water Cold Nat. GWH16/20/26 ¾ “ ¾ “ ¾ “ ¾ “ Table 4 6 720 817 545 (2016/02) Optiflow...
  • Page 7: Appliance Layout

    Product details | 7 Appliance layout 6720817545-01.1V Fig. 2 [1] Flue terminal [2] Flame sensor rod [3] Burner [4] Air pressure test point [5] Water flow sensor and Water valve [6] Fan [7] Cold water temperature sensor [8] Hot water outlet [9] Cold water inlet [10] By-pass valve [11] Gas inlet...
  • Page 8: Electrical Wiring Diagram

    8 | Product details Electrical wiring diagram 13,14 11,12 9,10 15,16 13,14 11,12 9,10 230 V 6720813761-15.1V Fig. 3 Electrical diagram [1] Flame sensor rod [10] Segmentation electrovalve 2 (gas) [2] Fan [11] Safety electrovalve (gas) [3] Ignition electrode [12] Thermal fuse [4] Power supply [13] Water flow sensor [5] Connection for frost-protection device...
  • Page 9: 2.10 Specification

    Product details | 9 2.10 Specification Technical features Units Performance Nominal gas consumption MJ/h Minimum gas consumption MJ/h Efficiency at 100% of nominal load 81.5 Gas supply data Minimum gas supply pressure (flowing) Natural gas (when operating) 1.13 1.13 1.13 Universal LP gas (when operating) 2.75 2.75...
  • Page 10: Regulations

    10 | Regulations Not suitable for pool or spa pool applications. Regulations Any local by-laws and regulations pertaining to installation and use of gas-fired appliances must be observed. This appliance must be installed in accordance with the manufacturers installation instructions, AS/NZS5601 and all WARNING: Scalding! Local Building &...
  • Page 11: Minimum Clearances

    Installation (only by authorised technicians) | 11 housing. Item Min.clea- ▶ Ensure this intake is free from vegetation and other rance (mm) obstructions. A Below eaves, balconies and other In order to prevent corrosion, the combustion air must not projections contain any corrosive substances.
  • Page 12: Water Connection

    12 | Installation (only by authorised technicians) Water connection CAUTION: ▶ Identify the cold and hot water pipe to avoid possible cross ▶ Never support or balance the water connection. heater on the water and gas ▶ Install a pressure reducing valve if required. It's preferable connections.
  • Page 13: Remote Control Connection (Optional)

    Installation (only by authorised technicians) | 13 ▶ Press until the display shows “AS”. Connecting the communication cable to the appliance ▶ Press the button ▶ Unscrew the electronic control unit fixing screw. Display will show “1”. ▶ Remove the grommet and feed the remote control ▶...
  • Page 14: Commissioning Of The Appliance

    ▶ Close all hot water taps. If the power cable is damaged, it must be ▶ Reset the appliance by switching it off at the socket and replaced with a Bosch supplied spare part. unplugging the cord. 4.10 Changing the setpoint limit temperature (only for 55 °C preset appliances)
  • Page 15: Regulating The Gas

    Regulating the gas (only for authorised technicians) | 15 Adjusting the appliance Calibration example Setpoint Water temp. at tap Setpoint calibration Always start the adjustment by P1 followed 55 °C 53 °C +2 °C by P2. Table 9 5.3.1 Access to test pointsads Regulating the gas (only for authorised ▶...
  • Page 16: Adjusting The Minimum Flow (Parameter P2)

    16 | Regulating the gas (only for authorised technicians) ▶ Press the button ▶ Simultaneously press the for 3 The appliance is now ready for adjustment of the maximum seconds. gas flow. Display will show the temperature selected. ▶ Open a hot water tap. ▶...
  • Page 17: Factory Default Settings

    AU 1300 30 70 37, NZ 0800 54 33 52 Display will show P0. ▶ Only use Bosch supplied replacement parts. ▶ Close the hot water tap. The adjustment of the burner pressure is complete. Periodic maintenance...
  • Page 18: Replacement Of The Fuse (Electronic Control Unit)

    18 | Maintenance (only by authorised service technician) Water filter ▶ Close the cold water inlet isolation valve. ▶ Unscrew the water filter on the cold water pipe. ▶ Clean the water filter. -or- ▶ Replace if required 6720817545-05.1V Fig. 11 Water filter Replacement of the fuse (electronic control unit)
  • Page 19: Troubleshooting

    Troubleshooting | 19 Troubleshooting Fitting, maintenance and repair must only be carried out by authorised technicians. The following table describes the possible solutions. Display Description Possible solution Cold and hot temperature sensor damaged. ▶ Check temperature sensor and associated connections. ▶...
  • Page 20 20 | Troubleshooting Display Description Possible solution Failure of control module. ▶ Unplug the electrical connection for 10 seconds. ▶ Reconnect and restart the appliance. ▶ If the problem persists, call an authorised service technician. Hot water temperature sensor detects overheating. ▶...
  • Page 21: Environment Considerations

    We participate in the recycling programmes of the countries in water quality table, the Bosch warranty would not apply. which our products are sold to ensure optimum recycling. All of our packaging materials are environmentally friendly and Water quality table can be recycled.
  • Page 22: Warranty Details

    1. Warranty of the hot water unit. Bosch offers, at its option, to repair or exchange this Bosch hot water unit or the relevant part listed in clause 2 below at no 4. Warranty conditions charge, if it becomes faulty or defective in manufacture or (a) Proof of purchase may be required.
  • Page 23 Purpose. A customer can object at any time to the use of their personal information for the Purpose. Bosch will cease to use a customer's personal information accordingly if an objection is made.

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