valutazioni - 3, GPA: 4.3 ( )

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21 2.6 Conversion to another gas Important: Install a gas valve suitable for the type of gas to be used. If the water heater has to function on a gas category (LP or natural gas) other than the gas set as standard (ex works), the water heater must be converted to the applicable gas category with the associated conversion kit(s). Only an accredited installer may convert the heater. All the injectors of the main burner bars and the injector of the ignition pilot must be replaced. Regurlary natural gas units do have a burner pressure regulator, but LP-gas units do not. The burner pressure regulator on the gas control must be removed when converting the heater for use on LPgas (if present). The burner pressure regulator must be fitted on the gas control when converting to natural gas (if required) The table with technical data shows which injectors must be fitted for the gas category in question. Procedure: 1. Shut the water heater down; close the main inlet gas valve and switch of the electricity supply at the main switch; 2. Remove the burner tray including the gas valve: a. remove the screws of the burner tray housing, b. loosen the wiring of ingition and ionisation pen on the burner controller, c. loosen the gas control cable, d. dismount the gas supply to the gas valve; 3. Remove the burner tray from underneath the heater; 4. Replace the main injectors and the injector of the ignition burner. Use the table with technical data to check that the diameter of the injectors is correct; 5. Converting from natural gas to LP-gas: a. remove the burner pressure regulator on the gas control, b. mount the flat covering plate with sealing provided in the conversion kit, c. see figure 15; Converting from LP-gas to natural gas: a. remove the flat covering plate with sealing on the gas control, b. mount the burner pressure regulator on the gas valve, c. See figure 16; 6. Mount the burner tray; 7. Reconnect the wiring and gas supply to the gas valve; 8. Open the main inlet gasvalve; 9. Check the gas inlet pressure; 10. Switch on the electricity supply at the main switch; 11. Commision the water heater; 12. Adjust the burner pressure to the value as indicated in the technical data; 13. Check the soundness; 14. Check the operation of the heater; 15. Fix the conversion sticker from the conversion kit below the rating plate to the heater, so that is clear on which gas category the heater operates. AOS 0546 AOS 547 Figure 15 - mounting covering plate with sealing on the gas valve Figure 16 - mounting burner pressure regulator on the gas valve, 23 2.10 Condensation If the water heater has been filled with cold water or if the hot water usage has been very high, normally condensation of the flue gasses will occur on the cold sides of the combustion chamber and the flue tubes. The water drops will fall on to the burner bed which can cause a hissing sound. This is normal and will disappear as soon as the water heater has reached its operating temperature again. 2.11 Spare parts To order spare parts, it is important to state the water heater type, model and the complete serial number. Figure 19 - Maintenance anodes 3. FOR THE USER 3.1. Instructions for use Installation and commissioning of the water heater should only be undertaken by a registered installer. 3.1.2 Filling the water heater 1. Assemble the drain-off tap and ensure it is closed; 2. Open the cold water tap to the water heater and open all taps on hot water drain-off points to vent them. The heater is filled as soon as cold water pours out of all drain-off points; 3. Close all taps at hot water drain-off points. The heater is now under water supply pressure. At this pressure, the relief valve if fitted may not release water. 3.1.3 Turning the water heater on 1. Check that the water heater is filled with water and that the gas pipe to the water heater is open; 2. Turn the temperature control knob fully to the leftl; 3. Turn on( the supply voltage by turning the main switch. NOTE: if the frost-thermostat has been turned on, the burner automation will immediately start its ignition procedure); 4. Turn the ‘I/O’-switch on the column in the ‘T’ position. The control lamp in the switch will now light; 5. Turn the temperature control switch in the desired position, preferably position 3 (approximately 60°C). The ventilation fan will start. the water heater will ignite and work automatically. 3.2 Usage The water temperature is controlled via the temperature regulator. If the temperature in the water heater falls below the set value, the temperature regulator call for heat. The burner automation will operate firstly the ventilation fan for its purge cycle, then a spark will ignite the pilot burner. The softlite control then ignites the main burner. The temperature is indicated by the position of the temperature dial: Position 1 = app. 40°C Position 2 = app. 50°C Position 3 = app. 60°C Position 4 = app. 70°C At high temperatures, more calcium precipitation is caused in the water h...

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