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Fig. 3 - Vent Adaptor for High Altitude Canadian
Installations
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.
GAS CONNECTIONS and Gas Regulator
NOTE: The Aquastar 125 BL is supplied with a gas
pressure regulator that must be installed on the heater
before attaching the gas supply line. See figure 4.
Failure to install the gas regulator as shown in figure
4 will be a violation of CSA certification of the unit.
The regulator supplied with the heater is preset for
the gas shown on the rating plate to the correct
pressure. It is an appliance level regulator designed
for (low inlet) pressure (less than 1/2 Psig or 15” W.C.)
DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural
gas line.
Fig. 4 - Installation of Gas Pressure Regulator
5” X 6” ADAPTOR
USED ON HIGH ALTITUDE
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.
Optional power vent available in order to sidewall vent.
Contact your local dealer.
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 ap-
pliances.
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.
The AquaStar 125BL 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 125BL is 5 inches.
However, in CANADA, for installations at high altitude (2000-
4500 feet above sea level) a six inch flue is required. A 5"
by 6" flue adaptor must be affixed to the flue collar of the
AquaStar with at least two screws. See figure 3.
GAS INLET PIPE
PRESSURE TAP
PRESSURE REGULATOR
(with directional arrow on
reverse side pointing
upward)
PLASTIC VENT CAP
The pressure regulator provided with the heater is adjusted
to deliver the proper gas pressure (as indicated on the rating
plate and in the manual for altitude up to 2000 feet (660
meters) above sea level. On appliances being installed
above 2000 ft (660 meters) elevation, the inlet gas pressure
should be set at installation to the value shown below.