140° and 95°F at various flow rates between 2.0 and 4.0 gallons per minute. The position you select on the temperature selector dial will depend on the temperature of the incoming water (50°F is average in the U.S.). In warm weather regions where the incoming cold water is generally warmer, or during the hot weather months in some other areas a midway setting on the temperature selector knob will produce a temperature rise of about 70°F, giving an output of approximately 120°F. At this setting, if it is still necessary, one could mix a small amount of cold water in a shower and have a comfortable shower at about 3 gallons/ minute. During the colder months, or in cold climate areas, it might be necessary to set the control all the way clockwise to the right for maximum temperature rise.
Do not supply the AquaStar 125FX with preheated water. For this type of application, purchase a solar model 125 B LPS or 125 B 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.
Fig. 11 - Temperature Adjustment Knob
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. Unscrew the central screw located at the bottom of the front cover. 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.
Water Valve (Part # 8707002802): The water valve on this heater should be serviced periodically. Lubricate component #36 on page 20 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings fresh and pushrod sliding smoothly. Every
NOTE: If water valve is removed, be sure to also inspect the o ring seal on the end of the right hand side water pipe before
Pilot Flame: The pilot flame should burn with a clean, sharp, blue flame and should resemble the diagram in Fig. 12. If the flame is soft and yellow, the pilot burner orifice may need to be cleaned or serviced. The pilot flame should be approximately 2 inches long, extending past the flame sensor. If the flame is too small, it will not reach the flame sensor and the burners will not come on.
3mm
Correct gap between pilot burner tip and electrode tip
Piezo Electrode
Flame sensor
Piezo
Electrode
Fig. 12 - Characteristic Pilot Flame
To clean the pilot burner and/or the pilot orifice: Turn off the gas at the unit (Position ‘ 
’). Remove the cover of the heater. To do so, pull off the temperature knob and unscrew and remove the temperature knob collar. Pull main cover out toward you and lift up and out. The pilot orifices should also be cleaned or replaced. Do not enlarge the orifice (see fig. 13). Do not use any wire or sharp object to clean orifices. Natural gas orifices are large enough that you can usually clean them by blowing through them. LP orifices, on the other hand, are too small to clean and should be replaced. See #3 in Trouble Shooting Section. To access the pilot orifice, remove 2 screws holding pilot assembly in place. Then loosen the compression fitting and lift up pilot burner to expose pilot orifice.
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