Bosch Appliances 125HX LP 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 available in order to sidewall vent. 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.

Run the unit for at least 10 minutes. Then hold an ordinary mirror at the side above the front shell. Any flue gases backdrafting will cause the mirror to fog. 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.

The mirror will remain clear with a properly functioning draft.

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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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 Proper Location for Installing Your Heater Where IT could FreezeGeneral Rules to Follow For Safe Operation Mounting Installation Combustion AIR RequirementsClearances Venting To check the draftMaximum Inlet GAS Flow Pressure Setting GAS Line SizingAltitude Natural Gas Liquid Propane GAS Line Sizing 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 IntroductionNo 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 720 606 562 Interior Components Diagram and Parts List Interior Components Diagram Parts List 125HX Installation Checklist GAS Line Size Controlled Energy Corp

125HX LP specifications

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