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Manafacture: Bradford-White Corp
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File name: 591219c4-6332-4d86-a563-fb0c37a65c78.pdf
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manual abstract
(only for the EQH 200 model, see Figure 7b). Procedure: 1. Turn down both clamps (1). 2. Place the entire door into the appliance and move the opening over the burner venturi. 3. Turn both clamps outward (3), pushing them over the edge of the burner chamber. 2.3 Pilot adjustment The pilot can be adjusted by means of the regulating screw under the plastic cover on the right hand side of the gas control block. Turn the screw clockwise to reduce the gas pressure and anti clockwise to increase the pressure. Care should be taken to ensure the pilot covers the thermocouple element correctly 2.4 Putting out of operation 1. For short periods of time the control knob should be turned to (X); the pilot keeps burning. 2. For longer periods of time the knob should be turned to the (l) position; the pilot is extinguished. 3. Close the gas tap in the supply pipe. In case of longer interruptions or in the event of risk of frost it is Figure 7a - Mounting the inside door A B Figure 7b - Mounting the inside door AOS 0520 IMD 0359 3 1 1 3 16 recommended to also close the cold water tap and to drain the appliance after cooling (open the drain tap; it is possible to connect a drain hose to the drain tap; open the nearest hot water drain point to prevent air locks). To be able to drain the appliance completely it should be disconnected and tilted slightly in the direction of the drain tap. 2.5 Temperature regulation The appliance is under water supply pressure (maximum 8 bar). The amount of cold water that is added is equal to the amount of hot water used. The gas control block automatically regulates the gas supply. The main burner will ignite as soon as a reduction in water temperature is sensed by the thermostat. The main burner will shut down as soon as the preset temperature is achieved. Position 1 = approximately 30°C Position 2 = approximately 40°C Position 3 = approximately 50°C Position 4 = approximately 60°C Position 5 = approximately 70°C At high water temperatures there is more scale buildup in the appliance. It is for this reason that it is recommended to place the temperature control knob in position 4 as the accumulation of scale will be reduced. In addition a safety thermostat has been fitted. This thermostat completely shuts off the gas supply if the water temperature reaches 82°C, also extinguishing the pilot burner. Figure 8 - Setting the pilot AOS 0485 17 2.6 Setting the nominal heat input The gas control has been factory preset to the water heater nominal heat input. A further check of the burner pressure should be carried out during the commissioning of the unit after installation. The following procedure should be followed. 1. Remove the protruding cover screw on the right side of the gas control block and connect a U-gauge manometer to the outlet. 2. Put the appliance into operation and ignite the burner. 3. Check the burner pressure and, if necessary, reset by means of the adjusting screw “pr adj” (pressure adjustment; see Figure 9). To make this possible the temperature control knob should be removed by pulling it straight forward, making the “pr adj” visible. Turning clockwise reduces the pressure; turning anti clockwise increases the pressure. It is recommended to check the heat input by means of the gas meter. 4. Turn off the appliance and remove the manometer hose and replace the adjusting screw. 5. Replace the thermostat control knob. 6. Put the appliance into operation. 2.7 Converting to another type of gas For conversion of the appliance from natural gas to another type of gas, or vice versa, it is necessary to exchange the pilot injector and the main injector. The conversion may only be executed by a qualified competent person. Figure 9 - Setting the nominal load AOS 0486 Description Unit EQ 115 EQ 155 G20 G30 G31 G20 G30 G31 Inlet pressure mbar 20 30 37 20 30 37 Burner pressure mbar 12.5 30 37 12.5 30 37 Diameter main injector mm 2.35 1.40 1.40 2.60 1.50 1.50 Diameter pilot injector mm 2x0.27 0.22 0.22 2x0.27 0.22 0.22 Description Unit EQH 200 G20 G30 G31 Inlet pressure mbar 20 30 37 Burner pressure mbar 10.5 30 37 Diameter main injector mm 3.50 1.95 1.95 Diameter pilot injector mm 2x0.27 0.22 0.22 Procedure: 1. Close the main gas tap in the gas supply. 2. Demount the burner (see “Cleaning”). 3. Replace the injector of the main burner and the pilot burner with the correct injectors from the conversion set (see tables above). 4.a Conversion from natural gas to LP- gas -Put the pressure regulation of the gas control block out of operation. To do this the temperature regulating knob should be pulled straight forward. Turn the ‘no pr’ (no pressure regulation) screw down tight (see Figure 10). -Seal this setting with lacquer. -Remount the burner in reverse order. -Open the main gas tap. 19 2.8.1 Sacrificial anode The life cycle of the anode is determined by the quality and the quantity of the water flowing through the apparatus. It is therefore recommended that the anode be inspected and replaced i...