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6 6 720 606 804 (02.10)
Fig. 2 - Incandescent Particle Tray Illustration
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.
The AquaStar 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.
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
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
Fig. 1 - Mounting the Heater
WALL STUDS
1” X 4”
SPACE BOARD
13 ¼”
SUPPORT BOARD
SCREWS
INCANDESCENT PARTICLE TRAY
Fig. 3 - Vent Adaptor for High Altitude Canadian
Installations
5” X 6” ADAPTOR
USED ON HIGH ALTITUDE