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Bosch Optiflow Professional GWH12 Installation Manual

Room sealed gas continuous flow water heaters 1 ctd e23/31 f5 l
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Room sealed gas continuous flow water heaters
Optiflow Professional
GWH12/16/20 1 CTD E23/31 F5 L
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!
6720808879-00.1V

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  Summary of Contents for Bosch Optiflow Professional GWH12

  • Page 1 6720808879-00.1V Room sealed gas continuous flow water heaters Optiflow Professional GWH12/16/20 1 CTD E23/31 F5 L 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 Key to symbols and safety instructions ..3 Regulating the gas (only for authorised Key to symbols ..... . . 3 technicians) .
  • Page 3: Key To Symbols And Safety Instructions

    This symbol indicates important information responsibility of the property owner. where there is no risk to people or property. ▶ Use only genuine Bosch spare parts. Explosive and highly flammable material Additional symbols ▶ Do not store or use flammable material (paper, spray cans, solvents, paints, etc) near the heater.
  • Page 4 4 | Key to symbols and safety instructions • Ensuring the appliance performs to the specifications All gas appliances require adequate air intake stated on the rating label. to ensure correct combustion. Insects and • Demonstrating the operation of the appliance to the dirt ingress may affect combustion causing customer before leaving.
  • Page 5: Product Details

    Product details | 5 • Appliance documentation Safety of electrical appliances for domestic use and similar purposes Rating plate The following requirements apply in accordance with EN The rating plate is located on the outside of the appliance, on 60335-1 in order to prevent hazards from occurring when the bottom.
  • Page 6: Dimensions And Minimum Clearances

    6 | Product details Dimensions and minimum clearances Fig. 1 Dimensions (in mm) Connections Water Cold Nat. Universal GWH12 GWH16 ½ “ ½ “ ½ “ ½ “ GWH20 Table 4 Dimensions (in mm) 6 720 810 560 (2016/06) Optiflow Professional...
  • Page 7: Appliance Layout

    Product details | 7 Appliance layout Fig. 2 [1] Heat exchanger [13] Ignition electrode [2] Flame sensor rod [14] Burner pressure test point [3] Burner [15] Water flow sensor and Water valve [4] Air pressure test point [16] Electronic control unit [5] Fan [17] Cold water temperature sensor [6] Air temperature sensor...
  • Page 8: Electrical Wiring Diagram

    8 | Product details Electrical wiring diagram Fig. 3 Electrical diagram [1] Flame sensor rod [9] Segmentation electrovalve 2 (gas) [2] Fan [10] Safety electrovalve (gas) [3] Ignition electrode [11] Thermal fuse [4] Power supply [12] Water flow sensor [5] Connection for frost protection [13] Air temperature sensor [6] Connection for remote control [14] Hot water temperature sensor...
  • Page 9: Specification

    Product details | 9 2.10 Specification Technical features Units GWH12 GWH16 GWH20 Performance Nominal Gas Consumption MJ/h 90.0 120.2 149.0 Minimum gas consumption MJ/h 11.9 18.0 18.0 Efficiency at 100% of nominal load 82.4 82.4 82.4 Gas supply data Gas supply pressure (flowing) Natural gas (when operating) 1.13 1.13...
  • Page 10: Flue Accessories

    ▶ Add any flue lengths, bends, or condensate traps required may cause combustion gases to leak for your configuration. through the appliance installation ▶ Place your order using the Bosch part numbers shown compartment and may result in personal below. injury or death.
  • Page 11 6720809968-04.3V Fig. 4 [A] Flue pipe length [B] Lowest average inlet air temperature Bosch 4000S flue components All 4000S coaxial flue components have an internal pipe diameter of 60 mm and an external pipe diameter of 100 mm. Optiflow Professional...
  • Page 12: Vertical Installation

    12 | Regulations 2.11.2 Vertical installation Installation (only by an authorised Maximum lengths (Lmax) technicians) Lmax Concentric pipes DANGER: Explosion! GWH12 12 m ▶ Always shut off the gas valve before GWH16 carrying out work on gas pipes. GWH20 10 m The appliance installation, electrical Table 7 connection, gas connection, connection of...
  • Page 13: Choice Of Installation Site

    Installation (only by an authorised technicians) | 13 Choice of installation site 4.2.1 Regulations concerning the installation site ▶ The water heater may not be installed over a heat source. ▶ Comply with the minimum installation clearances indicated in fig. 5 and table 10. ▶...
  • Page 14: Fitting Hanging-Plate

    14 | Installation (only by an authorised technicians) Installing the appliance Item Min.clea- rance (mm) NOTICE: The appliance may be damaged if A Below eaves, balconies and other dirt is allowed to enter via the gas or water projections connections. B From the ground, above a balcony or other ▶...
  • Page 15: Installation Of Flue Accessories

    Display will show “E”. ▶ Press until the display shows “AS”. Flue configuration ▶ Press the button Bosch 4000S supplied flue must be used with these Display will show “1”. appliances. ▶ Press the button and select the altitude of the Cutting coaxial flue to length installation site according with table below.
  • Page 16: Electrical Connection (Only By Authorised Technicians)

    If the power cable is damaged, it must be The maximum temperature is preset to 55 °C. If required it can replaced with a Bosch supplied spare part. be increased to 60 °C or 70 °C. ▶ Enter the Service function (section 5.2).
  • Page 17: Regulating The Gas

    Regulating the gas (only for authorised technicians) | 17 Service function ▶ Press the button for 3 seconds. The value flashes to confirm the new setpoint limit. Accessing the service function Calibration example ▶ Press and hold down at the same time ,and for 3 seconds.
  • Page 18: Adjusting The Minimum Flow (Parameter P2)

    18 | Regulating the gas (only for authorised technicians) ▶ Loosen the test point screw of the air pressure test ▶ Press for 3 seconds. point.[A] The displayed value flashes as a sign of confirmation. ▶ Connect the negative "-" side of the pressure gauge to the ▶...
  • Page 19: Factory Default Settings

    Factory default settings ▶ Enter the service mode by pressing and holding down the ▶ Your appliance should only be attended to by a Bosch , and buttons simultaneously for 3 service technician. To locate your nearest service provider, seconds (section 5.2).
  • Page 20: Periodic Maintenance

    20 | Maintenance (only by authorised service technician) Periodic maintenance Replacement of the fuse (electronic control unit) Functional check ▶ Loosen the fixing screw of the electronic control unit ▶ Check the correct operation of all the safety, regulation and ▶...
  • Page 21: Troubleshooting

    Troubleshooting | 21 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 water temperature sensor damaged. ▶ Check temperature sensor and associated connections.
  • Page 22 22 | Troubleshooting Display Description Possible solution Air temperature sensor detects overheating (leaking ▶ Switch off at the power point and remove combustion products inside the combustion the plug from the electrical socket. chamber). ▶ Do not try to Restart the appliance. ▶...
  • Page 23: Environmental Considerations

    Environmental considerations Water quality Environmental protection is a fundamental corporate strategy All Bosch water heating appliances are constructed from high of the Bosch Group. quality materials and components and all are certified for The quality of our products, their efficiency and environmental...
  • Page 24: 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 25 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.
  • Page 26 26 | Notes 6 720 810 560 (2016/06) Optiflow Professional...
  • Page 27 | 27 Notes Optiflow Professional 6 720 810 560 (2016/06)
  • Page 28 6720810560...