User manual BOSCH GWH 715 ES

[. . . ] GWH 715 ES (GWH 715 CTDR EFS) Temperature Modulated with Electronic Ignition Suitable for heating potable water only - Not approved for space heating purposes (Intended for variable flow applications) GWH 715 ES - Natural Gas GWH 715 ES - 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, adjustment, alteration, service or maintenance can cause injury or property damage. For assistance or additional information consult a qualified installer, service agency or the gas supplier. [. . . ] 53 Locked condition Whenever LCD shows the temperature setting cannot be adjusted because the appliance is in use by a user which already selected a different temperature. Appliance will be automatically unlocked after closing the hot water tap. B press reset firmly in order to return heater to normal operation. 28 6 720 608 158 Maintenance and service 6 Maintenance and service Warning: Always turn off the electrical power supply, turn off the manual gas shut off valve and turn off the water shut off valves whenever servicing. Caution: B Check and clean the complete water heating system once a year. B Carry out a maintenance overhaul if necessary. Immediately repair defects to avoid damage to the system. Pressure relief valve · Manually open the pressure relief valve to ensure proper operation. Inlet water filter · Verify the inlet filter screen is clean and undamaged. The inlet water filter is located above the ¾" cold water inlet on the right side of the appliance (See Fig. Close installer supplied cold water shutoff and supplied water shutoffs, carefully remove inlet and outlet clips on watervalve. Descaling Annual maintenance table Every year 1. Inspect venting system Inspect heat exchanger Inspect burner Inspect condensate trap Inspect water filter X X X X X · In areas where the water supply has a high mineral content (see Table 2, page 12), the heat exchanger should be periodically flushed with a descaling solution. Scale build up will shorten the life of the water heater and damage resulting from is not covered under warranty. Refer to section 6. 3 for detailed instructions on descaling the heat exchanger. Fin coils · Inspect heat exchanger fincoil for soot build-up or blockage. To access fincoil, venting must be removed from flue gas exhaust accessory. With venting removed and inspect fincoil below with a flashlight. If there is evidence of soot build-up or blockage, the heat exchanger should be removed by a professsional and cleaned thoroughly. To remove the heat exchanger, consult service bulletin at www. boschpro. com. Table 15 Annual maintenance The unit should be checked once a year by a gas technician. If repairs are needed, the repairs should be done by a gas technician. 6. 1 Annual maintenance (To remove front cover, see page 6. ) Venting System · Venting system - inspect inside of flue pipe for any blockage or restriction. Observe burner flames during heater operation. Inspect the combustion air inlet pipe for blockage or debris. Inspect combustion air and exhaust terminations for blockage or debris. [. . . ] However, if the water heater is in an approved domestic hot water recirculation application, this heat exchanger warranty is limited to five (5) years from date of original installation and operation. If the water heater is installed in other than a single family dwelling, this heat exchanger warranty is limited to two (2) years from date of original installation and operation. Exceptions This warranty will not apply: · 1. to defects or malfunctions resulting from failure to properly install, operate or maintain the unit in accordance with the printed instructions provided; · 2. [. . . ]