User manual BOSCH GWS 8-125

[. . . ] In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter. Upon completion of the installation, these instructions should be handed to the user of the appliance for future reference. · Do not touch any electrical switch; do not use any phone in your building. · Immediately call your gas supplier from a neighbor's phone. [. . . ] 21 6 720 608 126 15 Operation instructions 4. 4 Setting the water temperature The GWS 8-125 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. See table 4 for details. The hottest position is the highest flame position all the way to the right. Fig. 24 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. 22 Knob position Degree rise Activation rate Max flow rate Clockwise 90°F 0. 5 GPM 2. 0 GPM Counterclockwise 45°F 1. 1 GPM 3. 7 GPM B Empty the appliance of all water. Table 4 Temperature rise (slide control to the right) 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. 25 Drain plug and filter location 1 2 Retaining clip Threaded bushing Fig. Lubricating the water valve A more detailed instruction is available on our website at www. boschpro. com. Shut off the installer supplied cold water isolation valve to the heater. Position a bucket under the heater's water valve assembly to catch any water that may drain from the heater. Disconnect the water pipe leading out of water valve to the heat exchanger. Do this by removing the retaining 6 720 608 126 17 Maintenance and service 5. 4 Main burners The main burner flames should be blue, with a more intense blue cone in the center core. Yellow flames could be a sign of wrong size gas orifices or dirty burners, a blockage on the heat exchangers fins. If some burners have yellow flames while others have blue flames, it is likely that dust, lint or spider webs have partially clogged the burner venturis. Run solution through the heat exchanger until the solution returning to the descaling reservoir comes out clear. Position a container below the hot water outlet and connect cold water supply. Open cold water supply isolation valve and flush heat exchanger with clean water. Shut cold water isolation valve and reconnect hot water supply to the water heater. [. . . ] To prevent any freeze damage, introduce short bursts of compressed air (20-40 psi) through these connections to remove the residual water in the horizontal pipes and water valve. Follow instructions in chapter 4. 5 to remove any additional water remaining in the watervalve and heat exchanger. 6 720 608 126 23 Interior components and diagram parts list 8 8. 1 Interior components and diagram parts list Interior components Fig. 27 Functional scheme 4 5 10 11 20 Heat exchanger Burner Temperature adjustment selector Water valve Gas connection 22 26 30 102 Flexible hot outlet Gas control slide Pilot gas tubing Piezo 24 6 720 608 126 Interior components and diagram parts list 8. 2 Components diagram 5 4 6 44 41 47 51 39 8 48 14 12 13 15 19 16 20 21 23 11 24 10 18 43 9 52 27 22 7 53 25 26 35 17 13 49 29 32 45 34 3 2 1 33 6720608126-02. 1 JF 38 30 28 31 46 42 50 36 37 40 Fig. 28 Components Diagram 6 720 608 126 25 Interior components and diagram parts list 8. 3 Item 1 2 3 4 5 6 7 8 9 10 10 11 12 13 14 15 16 17 17 18 19 20 20 21 22 22 23 24 25 26 27 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 Parts list Description Front cover Shield Temp. [. . . ]