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
Powervented applications must utilize
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,
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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