Vanguard VMH3000TPSA Owner's Operation And Installation Manual

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Vanguard VMH3000TPSA Owner's Operation And Installation Manual Manual pdf 12 page image

12107102PROPANE/LP GAS RESIDENTIAL HEATERS®For more information, visit www.desatech.comInstallation must include an equipmentshutoff valve, union, and plugged 1/8" NPTtap. Locate NPT tap within reach for testgauge hook up. NPT tap must be upstreamfrom heater (see Figure 19).IMPORTANT: Install an equipment shutoffvalve in an accessible location. The equip-ment shutoff valve is for turning on orshutting off the gas to the appliance.Apply pipe joint sealant lightly to malethreads. This will prevent excess sealantfrom going into pipe. Excess sealant in pipecould result in clogged heater valves.Figure 19 - Gas Connection* An CSA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptablealternative to test gauge connection. Purchase the optional CSA design-certified equipmentshutoff valve from your dealer. See Accessories, page 23.CONNECTING TOGAS SUPPLYFigure 18 - External Regulator with VentPointing DownCAUTION: Use pipe joint seal-ant that is resistant to liquid pe-troleum (LP) gas.Propane/LPSupply TankVentPointingDownExternalRegulatorCAUTION: A qualified serviceperson must connect heater togas supply. Follow all local codes.Never connect heater directly tothe propane/LP supply. Thisheater requires an external regu-lator (not supplied). Install theexternal regulator between theheater and propane/LP supply.The installer must supply an external regu-lator. The external regulator will reduceincoming gas pressure. You must reduceincoming gas pressure to between 11 and 14inches of water. If you do not reduce incom-ing gas pressure, heater regulator damagecould occur. Install external regulator withthe vent pointing down as shown in Figure18. Pointing the vent down protects it fromfreezing rain or sleet.WARNING: A qualified serviceperson must connect heater to gassupply. Follow all local codes.INSTALLATIONContinued CAUTION: Use only new,black iron or steel pipe. Inter-nally-tinned copper tubing maybe used in certain areas. Checkyour local codes. Use pipe of 1/2"or greater diameter to allowproper gas volume to heater. Ifpipe is too small, undue loss ofpressure will occur.We recommend that you install a sedimenttrap in supply line as shown in Figure 19.Locate sediment trap where it is withinreach for cleaning. Install in piping systembetween fuel supply and heater. Locate sedi-ment trap where trapped matter is not likelyto freeze. A sediment trap traps moistureand contaminants. This keeps them fromgoing into heater controls. If sediment trapis not installed or is installed wrong, heatermay not run properly.IMPORTANT: Hold pressure regulator withwrench when connecting it to gas pipingand/or fittings.Tee JointReducerBushing to1/8" NPT1/8" NPTPlug TapTest GaugeConnection *Tee JointPipe NippleCapSediment TrapPressureRegulator3/8" NPTPipe NippleGroundUnion JointHeaterCabinet3" MinimumNote: Burnerbracket not shownfor clarityEquipmentShutoff Valve *From ExternalRegulator (11" W.C.to 14" W.C. Pressure)WARNING: This appliance re-quires a 3/8" NPT (National PipeThread) inlet connection to thepressure regulator.