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Resumen del manual
This step may have to be repeated. Fig. 21 B Observe the pilot flame through the peephole. The gas valve button should be held down for at least 15 seconds with pilot burning before releasing. When the gas valve button is released, the pilot should continue to burn. - If the gas valve button does not pop out when released, stop and immediately call your service technician or gas supplier. - If pilot does not stay lit, repeat all steps. - If pilot will not stay lit after several tries, slide the gas valve button all the way to the left and call service technician or gas supplier. B The heater will now fire at minimum power when water is drawn at a rate greater than the required activation flow rate. Note: If main burner should fail to ignite, make sure pilot is burning. If not, repeat lighting steps. Note: The GWH 425 PN operates in two modes. See SETTING THE WATER TEMPERATURE. 4.3 To turn off appliance B Slide the gas valve button all the way to the left and turn off the installer supplied manual gas shutoff on the supply line to the heater. Fig. 22 16 6 720 608 034 Operation instructions 4.4 Setting the water temperature The GWH 425 PN has a gas control that modulates burner input in response to flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand might vary. The output temperature can be adjusted with either the temperature adjustment knob or the gas control slide. Temperature adjustment knob The temperature adjustment knob on the front bottom of the heater (see Fig. 23) adjusts temperature by adjusting flow capacity. See table 4 for details. Fig. 23 As the temperature adjustment knob is turned counterclockwise, the output temperature will lower and the activation rate will be raised. Turning the knob clockwise will raise the temperature and lower the activation rate. Gas control slide button The gas control slide button adjusts temperature by adjusting how much gas is allowed to flow to the burners. As the slide is adjusted to the left, the output temperature will lower, with the lowest setting being the small flame position. Fig. 24 The hottest position is the highest flame position all the way to the right. Fig. 25 4.5 Draining water from heater If there is a risk of freezing, proceed as follows: B Remove the retaining clip from threaded bushing (pos. 1). B Remove threaded bushing (pos. 2) from water valve. B Empty the appliance of all water. Fig. 26 Drain plug and filter location 1 Retaining clip 2 Threaded bushing Knob position Clockwise Counterclockwise Degree rise 90°F 45°F Activation rate 0.5 GPM 1.1 GPM Max flow rate 2.0 GPM 3.7 GPM Table 4 Temperature rise (slide control to the right) Maintenance and service 5 Maintenance and service 5.1 Maintenance intervals Warning: Failure to perform recommended maintenance may result in complete failure of the unit over time. The warranty does not cover failures due to improper or insufficient maintenance. The GWH 425 PN requires periodic maintenance. The below time maintenance intervals should kept the unit operating for many years. Every year B Inspect inlet water filter screen ( 5.2) B Inspect pilot assembly and flame ( 5.3) B Inspect burner assembly ( 5.4) Every 2 years B Lubricate and clean water valve ( 5.2) Every 3 to 5 years B Rebuild water valve ( 5.2) B Clean pilot assembly and clean or replace orifice ( 5.3) 5.2 Water valve The water valve is the main control that tells the heater to fire. If the periodic maintenance is neglected, more costly damage may occur over time. Inspecting inlet water filter screen Shut off the installer supplied cold water isolation valve to the heater. If one is not installed, install before proceeding. Open the nearest hot water tap to drain the plumbing lines. Position a bucket under the heater's water valve assembly to catch any water that may drain from the heater. Remove the filter retaining clip located at base of water valve (see Fig. 26). Remove the threaded bushing to access the cylindrical filter inside. Remove filter, clean with water and inspect for damage. If the filter is at all damaged, it should be replaced. Lubricating the water valve A more detailed instruction is available on our website at Shut off the installer supplied cold water isolation valve to the heater. If one is not installed, install before proceeding. Open the nearest hot water tap to drain the plumbing lines. Position a bucket under the heater's water valve assembly to catch any water that may drain from the heater. Disconnect the inlet water pipe going to the back of the water valve. Disconnect the water pipe leading out of water valve to the heat exchanger. Do this by removing the retaining clip on water valve assembly and pulling the pipe free from the water valve. Loosen the two set screws at the bottom of the water valve where it connects to the gas valve. If the set screws are seized, STOP and call Bosch tech support before proceeding. Forcing and snapping...