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Manafacture: Bradford-White Corp File size: 2 mb File name: Language of manual:

Check the leads of the gas control If the error cannot be resolved or is persistent, contact your installation engineer No ignition: 1. Check whether the spark igniter is sparking in the pilot flame cap 2. Check the leads of the glow igniter 3. Check whether the spark igniter is correctly mounted in the bracket No flame detection: 1. Check whether the flame probe is defective 2. Check that the flame probe leads are properly connected (c) Failure in the safety circuit during heating (the safety thermostat has switched) 1. Check whether the control thermostat is working 2. Check whether the high-limit thermostat is working 3. Check that the circulation pump (if present) is working If the error cannot be resolved or is persistent, contact your installation engineer Instruction manual BFM is Instruction manual BFM s 12 Performing maintenance Caution 12.1 Introduction Maintenance may only by carried out by an approved service and maintenance engineer. At each service, the appliance undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order. 1. Water-side maintenance 2. Water-side maintenance 3. Gas-side maintenance 4. Finalising maintenance Note Before ordering spare parts, it is important to write down the appliance type and model, and the full serial number of the appliance. These details can be found on the rating plate. Only by ordering with this information can you be sure to receive the correct spare parts. 12.2 Preparation for To test whether all components are still working properly, complete the following maintenance steps: 1. Set the ON/OFF switch on the control panel to position 0. 2. Set the control thermostat to the highest value (note the original setting) and set the ON/OFF switch back again to position I. 3. If there is no heat demand, draw off some water to create a heat demand. 4. Check whether the heating cycle (9.3 "The appliance's heating cycle") runs correctly. 5. Set the control thermostat back to the original setting and set the ON/OFF switch back again to position I. 6. Check the supply and burner pressure (3.11 "Checking the supply pressure and burner pressure"), and adjust them if necessary. 7. Check that all components of the chimney flue system are properly attached. 8. Test the operation of the overflow valve of the protected cold supply set-up. The water should spurt out. 9. Test the overflow operation of the T&P valve. The water should spurt out. 10. Test the overflow operation of the T&P valve. The water should spurt out with a strong jet. 11. Check the drainpipes from the discharge points of all valves and remove any scale deposits that may be present. 12. Drain the appliance (6 "Draining"). Instruction manual BFM 12 Performing maintenance s 12.3 Water-side maintenance 12.3.1 Introduction The following steps must be carried out on the water side: 1. Checking the anodes. 2. Descaling and cleaning the tank. 12.3.2 Checking the anodes Timely replacement of the anodes extends the service life of the appliance. The appliance's anodes must be replaced as soon as they are 60% used or more (take this into consideration when determining the maintenance frequency). 1. Remove the chimney flue components from the top box. 2. Remove the cover from the top box. 3. Disconnect the fan leads and withdraw the cable through the strain relief. 4. Undo the screws in the top box. 5. Remove the top box from the appliance. 6. Undo the screws of the lid in the top side of the appliance. 7. Remove the lid from the appliance. 8. Remove the sealing ring from the appliance. 9. Loosen the anodes using suitable tools. 10. Check the anodes, and if necessary, replace them. 11. Now also check the flue baffles (12.4.4 "Checking the flue baffles"). If necessary, replace them. 12. Place a new sealing ring on the rim of the tank and re-fit the lid. 13. Re-fit the top box. 14. Feed the fan cable through the strain relief and connect the leads to the fan. See addendum A: BFM electrical diagram. 15. Re-fit the cover on the top box. 12.3.3 Descaling and cleaning the tank Scale and lime buildup prevent effective conduction of the heat to the water. Periodic cleaning and descaling prevents buildup of these deposits. This increases the service life of the appliance, and also improves the heating process. Take the rate of scale formation into account when deciding on maintenance frequency. Scale formation depends on the local water composition, the water consumption and the water temperature setting. A water temperature setting of maximum 60°C is recommended for prevention of excessive scale buildup. To ensure the perfectly watertight sealing of a cleaning opening, the gasket (6), O-ring (7), sealing rings (4), bolts (3) and possibly the lid (5) should be replaced with new components after opening (see the figure). A special set is obtainable from the supplier/manufacturer. To simplify the task of descaling and cleaning the tank, the appliance is equipped with t...

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