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User Manual - Page 17

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17
Operating Instructions and Owner’s ManualMr. Heater Series Heater
Outside Combustion Air Supply
TheMR.Heaterheaterisapprovedforinstallationwith
anoutsideairsupplysystem.Somecompoundssuchas
halogenatedhydrocarbonsorothercorrosivechemicalsinthe
aircanbedrawnintotheequipmentandcauseanaccelerated
rateofcorrosionofsomeoftheheatercomponents.Theuse
ofsuchchemicalcompoundsneartheenclosureshouldbe
avoided.
IMPORTANT: If the building has a slight negative
pressure or contaminants are present in the air, an
outside combustion air supply to the heaters is strongly
recommended.
Foranoutsideairsupply,afour(4”)inchO.D.singlewallpipe
maybeattachedtotheheater.Theductmaybeuptoforty-five
(30’)ft.maximumlengthortwo(2’)ft.minimumlengthwith
nomorethantwo(2)elbows.(SeeGeneralRequirementson
page15foradditionalinformation.)
Theairsupplyductmayhavetobeinsulatedtoprevent
condensationontheoutersurface.Theoutsideairterminal
shouldbesecurelyfastenedtotheoutsidewallbydrillingfour
(4)1/4”diameterholesintheoutsideflange;woodscrewsor
boltsandexpansionsleevesmaybeusedtofastenterminal.
FIGURE 13: Non-Pressurized Outside Air Supply Duct
PVCPipe,“DryerHose”,orequivalentmaybeusedinsteadof
standardventpipe.
SECTION 6
Gas Piping
Readapplicablewarningsin(Section1)beforeproceedingwith
GasPipeinstallation.Improperinstallationmayresultinproperty
damage,severeinjury,ordeath.
Meterandservicemustbelargeenoughtohandlealltheburners
beinginstalledplusanyotherconnectedload.Thegaslinewhich
feedthesystemmustbelargeenoughtosupplytherequiredgas
withamaximumpressuredropof1/2”watercolumn.Whengas
pipingisnotincludedinthelayoutdrawing,thelocalgassupplier
willusuallyhelpinplanningthegaspiping.
A1/2”tappingateachburnerlocationmustbelocatedandoriented
asshownin(Figure14).Tochecksystempressure,putaplugged
1/8”NPTtappinginthegaslineattheconnectiontotheburner
farthestfromthesupply.Beforeconnectingtheburnerstothe
supplysystem,verifythatallhighpressuretestingofthegaspiping
hasbeencompleted.Donothighpressuretestthegaspipingwith
theburnersconnected.
Followtheseinstructionstoensureaprofessionalgassupply
installation:
• Supportallgaspipingwithsuitablepipehanging
materials.
• Usewroughtironorwroughtsteelpipeandmalleable
ironfitting.Allpipefittingsshouldbenewandfree
fromdefects.Carefullyreamthepipeandtubingends
toremoveobstructionsandburrs.
• UseL.P.gas-resistantjointcompoundonallpipe
threads.
• Checkthepipeandtubingendsforleaksbefore
placingheatingequipmentintoservice.When
checkingforgasleaks,usesoapandwatersolution:
NEVER USE AN OPEN FLAME.
Installtheflexgasconnectorasshown.Theflexgasconnector
accommodatesexpansionoftheheatingsystemandallowsforeasy
installationandserviceoftheburner.
FIGURE 14: Gas Line Connection with Stainless Steel Flex Gas
Connector
Shut-OffValvemustbeparallel
toburnergasinlet.The2”
displacementshownisforthecold
condition.Thisdisplacementmay
reducewhenthesystemisfired.
Shut–offValve
12 "
2"
1/2"StainlessSteelFlexGasConnector
Stk.#16401
90°
45°
0°
45°
4" (10 cm)
Seal All Joints
4"
Heater Movement
Heater Movement
Heater Movement
Heater Movement
Outside Air
Terminal
Flex Pipe
6" (15 cm) to
12" (30 cm) Long
Flex Pipe
6" (15 cm) to
12" (30 cm) Long
Flex Pipe
6" (15 cm) to
12" (30 cm) Long
Outside Air
Terminal
NOTE:
Flue pipe requires additional
support. Flex pipe will not
support riser and outside
air terminal
Vertical Outside Air
Horizontal Outside Air
FIGURE 14A: Incorrect Gas Line Connection with Stainless
Steel Flex Gas Connector
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