6
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
designedand constructed soas to developa positive flow
adequatetoremovefluegassestotheoutdoors.Minimum
vent size must be 4". Minimum height must be 6 feet,
provided there are no elbows. Termination of vent
must be 2 feet above any obstruction within a 10 foot
radius. Consult your gas utility or National Fuel Gas
Code if vent will have elbows or share venting with
another appliance. The vent connector should have
asmuchverticalriseaspossible(minimum 12”) before
any horizontal run. 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
sectiongreaterthan45degreesfromverticalisconsidered
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
avoidtoomany elbows.
Applianceslocated in unconfinedspaces:
a) An unconfined space is one whose volume is greater
than50cubicfeetper1000Btuper hour ofthecombined
ratingofallappliancesinstalledinthespace.Thatwould
be2000 cubic feet for theAquaStar 38B alone.
b)Inunconfinedspacesinbuildingsofconventionalframe,
masonry, or metal construction, infiltration is normally
adequateto provide airforcombustion, ventilation, and
dilutionof flue gasses.
Identificationlabels are foundon the shippingbox, and on
the rating plate which is located on the right side panel of
thecover.Also,eachburnerorificeisstampedwithanumber
(79for LPG and120 for NaturalGas).
WARNING
Note: Theburnersofaninstantaneous“ondemand” water
heater such as the AquaStar are only on at the time that
hotwater is actually being used,the ventpipe is therefore
coldexceptfor the short durationswhen hot water isbeing
used,itis therefore veryimportant that the venting andair
supplybeadequatetoprovideagood positivedraftassoon
as the burners turn on.
TheAquaStar 38B instantaneouswaterheatershavebuilt-
in draft diverters and are designed for indoor installation
only.Thedraftdiverteroutletmustbeconnectedtoa clear,
unobstructedvent of the same size,or larger.
InCanada,CAN/CGA-B149InstallationCodefordetailed
requirements
In U.S.A., ANSI Z223.1 - NFPA 54, national Fuel Gas
Codefordetailedrequirements.
GAS CONNECTIONS and Gas Regulator
Before connecting the gas supply, check the rating plate
ontherightsideofthefrontcover to be sure that the heater
is rated for the same gas to which it will be connected.
In the United States: The installation must conform with
local codes or, in the absence of local codes, the National
FuelGasCodeANSIZ223.1/NFPA54.
InCanada:TheInstallationshouldconformwithCGAB149
INSTALLATION CODESand /or local installationcodes.
NOTE: The Aquastar 38 B is supplied with a gas
pressureregulatorthat must be installed on the heater
before attaching the gas supply line. See figure 2.
Place the gas regulator between the gas supply
connection(whichcomeswithamanual shutoff valve)
and the gas fitting wich is connected to the heater’s
gas inlet. There is a pressure tap on this gas fitting.
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. 1 - Mounting the Heater
WALLSTUDS
1” X 4”
SPACEBOARD
SUPPORTBOARD
5 ½”
To check the draft:
Close all doors and windows to the outside.
Turn on all appliances that force air out of the building.
Theseincludeallexhaust/ventilationfans,furnaces,clothes
dryers,wood burning stoves,etc.
Open all doors between the AquaStar and these other
appliances.
Runthe unit for atleast 10 minutes.Then hold anordinary
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
theheaterandfreezing of the heatexchangerinafreezing
environment.
Themirrorwillremainclearwith aproperlyfunctioningdraft.
