Bosch Appliances 125B LP, 125B NG Setting the Water Temperature, To Turn OFF GAS to Appliance

LIGHTING INSTRUCTIONS (as seen on front cover of heater)

1.STOP! Read the safety information above on this plate.

2.The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark.

3.Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow “B” in the safety information above on this plate. If you don’t smell gas, go to next step.

4.The pilot burner is located behind the peephole in the front center of the jacket directly below this instruction plate.

5.Slide the gas valve button to the right, under mark ( ).

6.Fully depress gas valve button and light pilot by pushing

“PILOT IGNITER” button ( ). This step may have to be repeated.

7.Observe the pilot flame through the peephole. The gas valve button should be held down at least 15 seconds with pilot burning. When the gas valve button is released, the pilot should continue to burn.

-If the gas valve button does not pop up when released, stop and immediately call your service technician or gas supplier.

-If pilot does not stay lit, repeat steps 1 through 7.

-If pilot will not stay lit after several tries, slide the gas

valve button to the left, under the OFF ( ) mark and call service technician or gas supplier.

8.Once pilot remains lit, then release gas valve button. The heater will now fire when water is drawn at a rate greater than the threshold flow rate.

NOTE: If main burner should fail to ignite, make sure pilot is burning. If not, repeat lighting steps 1 through 7.

NOTE: The 125B operates in two modes. See SETTING THE WATER TEMPERATURE.

TO TURN OFF GAS TO APPLIANCE

Slide the gas valve button to the far left, under the off ( ) mark and close the gas supply to the heater.

SETTING THE WATER TEMPERATURE

The Aquastar 125B has a gas control that modulates burner input in response to hot water flow. Its purpose is to ensure that the hot water temperature will remain steady, although the water flow demand may vary (down to ½ gal/minute). Also, depending on the unit’s adjustable gas control slide

being set in the single flame ( ) or three flame ( ) setting, the 125B can produce and control comfortable hot water temperatures as seasonal ground water temperatures vary.

To adjust the temperature on the heater, turn on a hot water tap. At the water heater, turn the temperature adjustment knob (see Fig. 9) all the way to the right (clockwise) and set the gas control slide to the three flame ( ) setting. This will produce a temperature rise of approximately 90F at flow rates between 0.5 and 2.0 gallons per minute. Given that average incoming water temperatures are 50F in winter months; this heater will produce approximately 140F water at these flow rates. Turning the dial all the way to the left

GAS CONTROL SLIDE

TEMPERATURE

ADJUSTMENT KNOB

Fig. 9 - Water Flow Control Knob

(counterclockwise) will produce a temperature rise of approximately 45F for flow rates between 1.1 and 3.7 gallons per minute. When setting the gas control slide to the single flame ( ) setting and positioning the knob fully clockwise, the heater will produce a temperature rise of approximately 55F at flow rates between 0.5 and 2.0 gallons per minute. Turning the dial all the way the counterclockwise will produce a temperature rise of approximately 33F for flow rates between 1.1 and 3.7 gallons per minute. It is safest to select a comfortable temperature and not have to mix in a considerable amount of cold water. The positions you select will depend on the temperature of the incoming water (50F is average in the U.S.). In warm weather regions where the incoming ground water is generally warmer, or during hot weather months in other areas, a single flame ( ) setting may be best. During the colder months, or in cold climate areas, a three flame ( ) setting may be best. NOTE: The knob setting will affect the activation point of the heater; fully clockwise will allow the heater to activate at 0.5 gal/ minute. Fully counterclockwise will allow the heater to activate at 1.1 gal/minute.

Do not supply the 125B with preheated water. For this type of application, use the solar back-up model 125B LPS or 125B NGS.

If the inlet water temperature to the water heater is very warm the heater can produce temperatures that may be found to be too hot. A temperature balance shower valve can automatically mix in cold water to reduce such hot water temperature, in the event of any temperature instability with the use of a temperature balance shower valve, refer to shower valve manufactures instructions for internal adjustment setting. Adjustments should be made to the hottest setting in the shower valve. Additionally the temperature control of the heater can be adjusted to produce a more comfortable hot water temperature.

MAINTENANCE AND SERVICE

REVIEW MAINTENANCE TABLE ON THE BACK OF THIS MANUAL

Approximately once a year, the AquaStar should be checked and cleaned. To remove the front cover, first remove the incandescent particle tray, then pull off the temperature adjustment knob and unscrew and remove the plastic collar. Pull main cover out toward you and lift up and out. THE FOLLOWING OPERATIONS SHOULD BE PERFORMED BY A QUALIFIED SERVICE PERSON:

Vent System: Should be checked annually. Clean and repair as needed.

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