Bosch Appliances 125HX NG specifications Maintenance and Service, Trouble Shooting, Introduction

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MAINTENANCE AND SERVICE

REVIEW MAINTENANCE TABLE ON THE BACK OF THIS MANUAL.

Approximately once a year, theAquaStar 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.

Water Valve (Part # 8707002649): The water valve on this heater should be serviced periodically. Lubricate component 36 on page 16 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings fresh and pushrod sliding smoothly. Every 3-5 years replace component 36 on page 16. The frequency will depend on the mineral content of the water and conditions of use or whenever signs of corrosion appear at the gas and water valve joint. Periodically check that the water inlet filter (#27 on page 16) is clean as well. 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 re-installing. Lubricating the o ring with lithium or faucet and valve grease is recommended.

Pilot Flame: The pilot flame should burn with a clean, sharp, blue flame and should resemble the diagram in Fig.10. If the flame is soft and yellow, the pilot burner orifice may need to be cleaned or replaced. 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

Fig. 10 - Characteristic Pilot Flame

(Pilot assembly shown without pilot hood)

To clean the pilot burner and/ or the pilot orifice : Turn

off the gas to the unit. Set the On/Off switch to Off (position

). Remove the cover of the heater. To do so, 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 pilot orifice should be cleaned or replaced. Do not enlarge the orifice.

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.

To access the pilot orifice, remove 2 screws holding pilot assembly in place. Then loosen compression fittings to expose pilot orifice.

PILOT ORIFICE

Fig. 11 - Pilot burner with pilot orifice (Pilot assembly shown without pilot hood)

Main Burner Flames: 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, or a blockage on the heat exchangers fins. If some burners have yellow flames while others have good flames, it is likely that dust, lint or spider webs have partially clogged the burner venturis. To clean the burners, contact a gas service person.

Mineral Scale Build-up: The AquaStar heater, when operated at lower temperature settings, does not accumulate mineral build-up. If however, the heater is used at the higher temperature settings and the water has a high mineral content, periodic descaling may be necessary. The heating coils should be flushed with a descaling solution. The descaling is done only to the heat exchanger. The chemicals will damage the hydro-generator and other parts. Consult your dealer or Controlled Energy for instructions.

TROUBLE SHOOTING

Introduction

The AquaStar 125HX burners are activated by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the water flow valve causing it to malfunction; Sediment build-up in faucet aerators, or shower heads; Uneven pressures between cold and hot. (with single lever faucets) Plumbing cross overs. These water flow related problems can cause the heater to deliver less than its full output, or to fail to ignite or to shut down completely.

6 720 606 804 (02.10)

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Contents What to do if YOU Smell GAS For Your SafetyTable of Contents Principle of Operation FeaturesAquaStar 125HX LP and 125HX NG Specifications Unpacking the Aquastar HeaterAquastar Model 125HX General Rules to Follow For Safe Operation Proper Location for Installing Your HeaterWater is being used do not Install in AN Area Where IT could FreezeClearances Mounting InstallationCombustion AIR Requirements To check the draft VentingAltitude Natural Gas Liquid Propane Maximum Inlet GAS Flow Pressure SettingGAS Line Sizing For LP GAS For Natural GASOperating Instructions For Your Safety Read Before Operating Your HOT Water HeaterWater Connections Off Setting the Water TemperatureLighting and Operating Instructions To Turn OFF GAS to ApplianceTo clean the pilot burner and/ or the pilot orifice Turn Maintenance and ServiceTrouble Shooting Review Maintenance Table on the Back of this ManualNo Spark AT the Pilot Water is not HOT Enough Pilot Lights but Burners will not Come onMain Burners GO OUT During HOT Water USE Water is TOO HOTGas pressure is too low HOT Water Temperature FluctuatesUnbalanced pressure in waterlines Diagram of AquaStar 125 HX Interior Components Diagram and Parts List Interior Components Diagram Parts List 125HX 720 606 804 720 606 804 Controlled Energy Corp Installation Checklist GAS Line Size

125HX NG specifications

Bosch Appliances has long been synonymous with innovation and quality, and their 125HX NG model is no exception. Designed for home cooks and culinary enthusiasts alike, the Bosch 125HX NG is a natural gas cooktop that combines state-of-the-art features with unmatched performance.

One of the standout features of the Bosch 125HX NG is its five powerful burners, which offer flexibility for various cooking techniques. These burners include a high-heat burner perfect for searing meats and achieving high-temperature cooking, along with a simmer burner designed for those delicate sauces and slow cooking tasks. The configuration of the burners allows for multiple pots and pans to be used simultaneously, maximizing efficiency and convenience in the kitchen.

The surface of the cooktop is constructed from premium stainless steel, offering not only a sleek aesthetic but also durability that withstands the rigors of daily cooking. The seamless design facilitates easy cleaning, ensuring that spills and stains can be wiped away with minimal effort.

Technology plays a key role in the Bosch 125HX NG model, featuring precise temperature control and rapid ignition systems. The automatic re-ignition feature enhances safety, ensuring that the flame is reignited if it goes out unexpectedly, providing peace of mind to users while cooking.

Another notable characteristic is the cooktop’s continuous grates, which provide stability for pots and pans, allowing for effortless sliding between burners without the risk of spills. These heavy-duty grates contribute to the overall robustness of the cooktop, reinforcing Bosch’s commitment to functional design.

In terms of installation, the Bosch 125HX NG is compatible with various kitchen layouts, making it a versatile choice for both new builds and remodels. The model is also designed with energy efficiency in mind, helping homeowners to save on gas consumption while enjoying consistent cooking results.

Overall, the Bosch Appliances 125HX NG is a sophisticated and reliable natural gas cooktop that caters to the needs of modern cooking. With its array of features, advanced technologies, and high-quality materials, it's a perfect addition to any kitchen, appealing to both amateur cooks and seasoned chefs. Investing in a Bosch 125HX NG means enjoying durability, functionality, and style in one exceptional cooking appliance.
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