Desa GN30 Safety Information And Installation Manual

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Desa GN30 Safety Information And Installation Manual Manual pdf 11 page image

107884For more information, visit www.desatech.comFor more information, visit www.desatech.com1111INSTALLATIONContinuedINSTALLATIONConnecting To Gas SupplyFor propane/LP gas, the installer must supply an external regulator.The external regulator will reduce incoming gas pressure. You mustreduce incoming gas pressure to between 11 and 14 inches of water.If you do not reduce incoming gas pressure, heater regulator damagecould occur. Install the external regulator with the vent pointingdown as shown in Figure 14. Pointing the vent down protects it fromfreezing rain or sleet.WARNING: A qualified service person must con-nect heater to gas supply. Follow all local codes.CAUTION: For propane/LP gas, never connectheater directly to the propane/LP supply. This heaterrequires an external regulator (not supplied). Installthe external regulator between the heater and pro-pane/LP supply.Typical Inlet Pipe Diameters20,000 Btu/Hr Models - 3/8" or greater30,000 Btu/Hr Models - 1/2" or greaterInstallation must include equipment shutoff valve, union, andplugged 1/8" NPT tap. Locate NPT tap within reach for test gaugehook up. NPT tap must be upstream from heater (see Figure 15).IMPORTANT: Install an equipment shutoff valve in an accessiblelocation. The equipment shutoff valve is for turning on or shuttingoff the gas to the appliance.Apply pipe joint sealant lightly to male NPT threads. This willprevent excess sealant from going into pipe. Excess sealant in pipecould result in clogged heater valves.CAUTION: Use only new, black iron or steel pipe.Internally-tinned copper tubing may be used in cer-tain areas. Check your local codes. Use pipe of largeenough diameter to allow proper gas volume to heater.If pipe is too small, undue loss of volume will occur.Install sediment trap in supply line as shown in Figure 15. Locatesediment trap where it is within reach for cleaning. Locate sedimenttrap where trapped matter is not likely to freeze. A sediment traptraps moisture and contaminants. This keeps them from going intoheater controls. If sediment trap is not installed or is installed wrong,heater may not run properly.IMPORTANT: Hold the pressure regulator with wrench whenconnecting it to gas piping and/or fittings. Do not over tighten pipeconnection to regulator. The regulator body could be damaged.WARNING: Use pipe joint sealant that is resistantto liquid petroleum (LP) gas.WARNING: This appliance requires a 3/8" NPT(National Pipe Thread) inlet connection to the pres-sure regulator.IMPORTANT: For natural gas, check gas line pressure beforeconnecting heater to gas line. Gas line pressure must be no greater than14 inches of water. If gas line pressure is higher, heater regulatordamage could occur.WARNING: For natural gas, never connect heaterto private (non-utility) gas wells. This gas is com-monly known as wellhead gas.CONNECTING TO GAS SUPPLYFigure 14 - External Regulator With Vent Pointing DownExternalRegulatorPropane/LPSupplyTankVentPointingDown* A CSA design-certified equipment shutoff valve with 1/8" NPTtap is an acceptable alternative to test gauge connection. Purchasethe optional CSA design-certified equipment shutoff valve fromyour dealer. See Accessories, page 27.Figure 15 - Gas ConnectionPressureRegulatorTee JointReducerBushing to1/8" NPT1/8" NPTPlug TapTestGaugeCon-nection*TeeJointPipeNippleCap3/8" NPTPipe Nipple HeaterCabinetSedimentTrapEquipmentShutoff Valve *3"MinimumNatural GasFrom Gas Meter(5" W.C. to 10.5" W.C.Pressure)Propane/LPFrom ExternalRegulator(11" W.C. to 14" W.C.Pressure)Ground Joint UnionNote: Burnerbracket notshown forclarity