Bosch Appliances 125HX NG specifications Venting, To check the draft

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WALL STUDS

13 ¼”

SUPPORT BOARD

1” X 4”

SPACE BOARD

Fig. 1 - Mounting the Heater

The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom of the water heater front cover at the time of installation. Use the screws provided. See figure 2

SCREWS

INCANDESCENT PARTICLE TRAY

Fig. 2 - Incandescent Particle Tray Illustration

VENTING

Vent pipe connection. WARNING: Do not reduce the vent pipe size.

This appliance must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney. The venting system must be designed and constructed so as to develop a positive flow adequate to remove flue gasses to the outdoors. Minimum vent size must be 5". Minimum vent height must be 6 feet, provided there are no elbows. Termination of the vent must be 2 feet above any obstruction within a 10 foot radius of the vent pipe. Consult your gas utility or National Gas Fuel Code if vent will have elbows or share venting with another appliance. The vent connector should have as much vertical rise as possible (minimum 12”) before any horizontal run.

Optional powervent (Model AQ-1) is available in order to sidewall vent. In the Commonwealth of Massachusetts:

Powervented applications must utilize proof-of-draft safety interlock device. Contact your local dealer. The appliance must be located as close as practicable to a chimney or vent. The vent pipe sections must be secured to each other with sheet metal screws. Keep in mind the minimum clearance from the top of your heater. Remember also that single wall vent pipe connectors require a 6 inch clearance from combustibles. National Fuel Gas Code specifies double wall — Type “B” — vent pipe be used in cold climates and for gas vents running through attics. We consider double wall vent pipe preferable in all circumstances. Any vent section greater than 45 degrees from vertical is considered horizontal.

Horizontal sections of vent connectors must slope upwards

at least 1/4 inch for every foot of its horizontal length. Keep the horizontal section short and avoid too many elbows.

To check the draft:

Close all doors and windows to the outside.

Turn on all appliances that force air out of the building. These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc.

Open all doors between the AquaStar and these other appliances.

With the control knob set fully clockwise and strong hot water flow rate, run the unit for at least 10 minutes. The 125HX is equipped with a Flue Gas Sensor; it’s mounted on the right side of the draft diverter (Flue Gas Sensor #34 on page 17). If the main burners shut off during this test it is because the Flue Gas Sensor has detected inadequate venting. This is a serious health hazard and must be corrected. Poor venting can result in soot building up inside the heater, overheating of the heater and freezing of the heat exchanger in a freezing environment, which is all a result of negative air flow. Additional combustion air and/or improved venting will be necessary to correct this.

WARNING

Note: The burners of an instantaneous “on demand” water heater such as the AquaStar are only on at the time that hot water is actually being used, the vent pipe is therefore cold except for the short durations when hot water is being used, it is therefore very important that the venting and air supply be adequate to provide a good positive draft as soon as the burners turn on. See venting guide on back page.

TheAquaStar 125HX instantaneous water heaters have built- in draft diverters and are designed for indoor installation only. The draft diverter outlet must be connected to a clear, unobstructed vent of the same size, or larger.

In Canada, CAN/CGA-B149 Installation Code for detailed requirements

In U.S.A., ANSI Z223.1 - NFPA 54, National Fuel Gas Code for detailed requirements.

The vent connection for the AquaStar 125HX is 5 inches. However, in CANADA, for installations at high altitude (2000- 4500 feet above sea level) a six inch vent is required. A 5" by 6" vent adaptor must be affixed to the vent collar of the AquaStar with at least two screws. See figure 3.

WARNING: Failure TO INCREASE THE VENT SIZE TO SIX INCHES AND/or assure that the manifold pressure is set to proper value listed for applications at high altitudes will cause unsafe venting, asphyxiation, and will void CSA Certification.

5” X 6” ADAPTOR

USED ON HIGH ALTITUDE

Fig. 3 - Vent Adaptor for High Altitude Canadian

Installations

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6 720 606 804 (02.10)

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Contents For Your Safety Table of ContentsWhat to do if YOU Smell GAS Unpacking the Aquastar Heater FeaturesAquaStar 125HX LP and 125HX NG Specifications Principle of OperationAquastar Model 125HX Where IT could Freeze Proper Location for Installing Your HeaterWater is being used do not Install in AN Area General Rules to Follow For Safe OperationMounting Installation Combustion AIR RequirementsClearances Venting To check the draftMaximum Inlet GAS Flow Pressure Setting GAS Line SizingAltitude Natural Gas Liquid Propane For Natural GAS For LP GASFor Your Safety Read Before Operating Your HOT Water Heater Water ConnectionsOperating Instructions To Turn OFF GAS to Appliance Setting the Water TemperatureLighting and Operating Instructions OffReview Maintenance Table on the Back of this Manual Maintenance and ServiceTrouble Shooting To clean the pilot burner and/ or the pilot orifice TurnNo Spark AT the Pilot Water is TOO HOT Pilot Lights but Burners will not Come onMain Burners GO OUT During HOT Water USE Water is not HOT EnoughHOT Water Temperature Fluctuates Unbalanced pressure in waterlinesGas pressure is too low Diagram of AquaStar 125 HX Interior Components Diagram and Parts List Interior Components Diagram Parts List 125HX 720 606 804 720 606 804 Installation Checklist GAS Line Size Controlled Energy Corp

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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