Sweatyour coldwater pipeto theAquaStar inlet
elbowfitting. NOTE: The inlet filterscreenand
waterflow restrictorcan be damagedby heat
if the cold water inlet elbow is attached to
the AquaStar when it is sweated to the cold
water inlet pipe. The inlet and outlet elbow fit-
tingsseal bymeans ofaunionconnectionwitha
washer type gasket at the joint. Although these
fittingshave1/2"threads,NPTfittingsshouldnot
besubstitutedfortheseelbowsandnopipedope
orthread tapeis tobe usedat thejoints. Be cer-
tainthere areno looseparticles ordirt inthe pip-
ing. Blow out or flush out the lines before con-
nectingto theAquaStar.
5. Connecting the pressure relief valve
Atemperature andpressure reliefvalve mustbe
installedonthe hotwaterline,closetotheheater.
Novalve istobeplacedbetweenthereliefvalve
andtheheater. Installation shallbemadeinsuch
a manner that the discharge from the tempera-
ture and pressure relief valve will be conducted
to a suitable place for disposal when relief oc-
curs. No reducing coupling or other restriction
may be installed in the discharge line. The dis-
charge line must be installed such that it allows
completedrainage ofboththevalveand theline.
The location of the relief valve must be readily
accessible for servicing or replacement. To ac-
commodatethepressure reliefvalve,a suitable
fitting connected to an extension of a "T" fitting
can be sweated to the line. Make the T-fitting
extensionlongenoughtoensurethatthetempera-
tureprobe doesnot interferewith thewater flow.
Therelief pressureof thevalve mustnot exceed
150psig. Therelieftemperatureofthevalvemust
not exceed 210ºF and the discharge capacity
mustbeat least125,000 Btuperhour.
6. Vent pipe connection. WARNING: Do not
reduce the vent pipe size.
Thisappliance mustbeventedtothe outsidefol-
lowingall localordinances andspecificationsfor
installinga gasapplianceventorchimney. The
gassestotheoutdoorsunder alloperating con-
ventingsystem mustbe constructedso asto
developapositiveflowadequate toremove flue
ditions.
Theappliance mustbelocatedasclose asprac-
ticabletoa chimneyor vent. The ventpipe sec-
tionsmust befastenedwithsheetmetalscrews.
Keep in mind the minimum clearance from the
top of your heater. Remember also that single
wallventpipe connectorsrequire a6inch clear-
ancefromcombustibles. NationalFuelGasCode
specifies double wall - Type "B" - vent pipe be
used in cold climates and for gas vents running
throughattics. Weconsiderdoublewallventpipe
preferable in all circumstances. The vent con-
nectorshould haveas muchvertical riseas pos-
sible (minimum 12") before any horizontal run.
Any vent section greater than 45 degrees from
verticalis consideredhorizontal. Horizontalsec-
tions of vent connectors must slope upwards at
least1/4inchforeveryfootofitshorizontallength.
Keep the horizontal section short and avoid too
manyelbows.
Note: AlthoughtheAquaStarhasthesamevent-
ing requirements as other Category I gas appli-
ances,certain featuresandspecificusecharac-
teristics make it more important to have a vent-
ingsystemwhich exceedsminimum standards.
AquaStar thermostats modulate burner output.
Therefore, when operating at less than full out-
put, the heater does not have its full heating ca-
pacity to warm the flue pipes to create a natural
draft. Most gas appliances have longer duty
cyclesthan aretypical ofinstantaneousheaters.
For these it is considered sufficient if the appli-
ance can overcome a downdraft within the first
fiveminutesofoperation. Aninstantaneous "on
demand" heater like the AquaStar may have
frequent operating cycles of less than a minute.
If venting and air supply are inadequate to pro-
vide a positive draft as soon as the heater turns
on,theheatermaynot remainonlongenoughto
establish a positive draft. See venting guide on
page 27.
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