- Instruction Manual Residential Gas Water Heater

26
VENT PIPE PREPARATION
1. INITIAL PREPARATION.
 A.)Make sure the solvent cement you are planning to use
 isdesignedforthespecicapplicationyouareattempting.
B.)Knowthephysicalandchemicalcharacteristicsandlimitationsofthe
 PVCandCPVCpipingmaterialsthatyouareabouttouse.
C.)Knowthereputationofyourmanufacturerandtheirproducts.
D.)Knowyourownqualicationsorthoseofyourcontractor.Thesolvent
 weldingtechniqueofjoiningPVCandCPVCpipeisaspecializedskill
 justasanyotherpipettingtechnique.
E.)Closelysupervisetheinstallationandinspectthenishedjobbefore
 start-up.
F.) Contact themanufacturer,supplier,orcompetentconsulting
 agency if you have any questions about the application or
 installationofPVCandCPVCpipe.
 G.) Takethetimeandefforttodoaprofessionaljob.Shortcutswillonly
 causeyou problems and delays instart-up. By far, the majority of
failures in PVC and CPVC systems are the result of shortcuts and/or
 improperjoiningtechniques.
2. SELECTION OF MATERIALS.
•
 CuttingDevice-SaworPipeCutter.
•
 DeburringTool,Knife,File,orBevelingMachine(2”andabove).
•
Brush - Pure Bristle.
•
 Rag-Cotton(NotSynthetic).
•
Primer and Cleaner.
•
 SolventCement-PVCforPVCComponentsandCPVCforCPVC
 Components.
•
Containers - Metal or Glass to hold Primer and Cement. Select the
 type of PVC or CPVC materials to be used on the basis of their
 application with respect to chemical resistance, pressure rating,
 temperaturecharacteristics,etc.
•
 InsertionTool-Helpfulforlargerdiameterpipeandttings6inches
 (15.2cm)andabove.
PRIMER
ItisrecommendedthatTetrahydrofuran(THF)beusedtopreparethe
surfacesofpipeandttingsforsolventwelding.Donotusewater,
rags,gasolineoranyother substitutes for cleaning PVC or CPVC
surfaces. A chemical cleaner such as MEK may be used.
CEMENT
The cement should be a bodied cement of approximately 500 to
1600centipoiseviscositycontaining10-20%(byweight)virginPVC
material solvated with tetrahydrofuran (THF). Small quantities of
dimethyl formamide (DMF) may be included to act as a retarding
agenttoextendcuringtime.Selectthepropercement;Schedule40
cementshouldbeusedforSchedule40pipe.Neveruseall-purpose
cements,commercialgluesandadhesivesorABScementtojoinPVC
orCPVCpipeandttings.
APPLICATORS
Selectasuitablepurebristletypepaintbrush.Useaproperwidthbrush
orrollertoapplytheprimerandcement(seechartbelow).Speedy
applicationofcementisimportantduetoitsfastdryingcharacteristics.
IMPORTANTNOTE:Adaubertypeapplicatorshouldonlybeused
onpipesizes2”andbelow.Forlargerdiameterpipe,abrushorroller
must be used.
RECOMMENDED BRUSH* SIZE FOR PRIMER
AND CEMENT APPLICATIONS
NominalPipe(IPS) SizeBrushWidth
2 1.5”(3.8cm)
3 1.5”-2.5”(3.8cm-6.4cm)
*USE ONLY NATURAL BRISTLE
3. MAKING THE JOINT.
 A.)Cutting Pipe must be squarely cut to allow for the proper
 interfacingofthepipeendandthettingsocketbottom.This
 canbeaccomplishedwithamiterboxsaworwheeltypecutter
 Wheeltypecuttersarenotgenerallyrecommendedforlarger
 diameterssincetheytendtoarethecornerofthepipeend.If
 this type of cutter is used, the are on the end must be
 completelyremoved.
NOTE:Powersawsshouldbespecicallydesignedtocutplasticpipe.
STEP A