Desa Comfort Glow CGN20TA Owner's Operation And Installation Manual

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Desa Comfort Glow CGN20TA Owner's Operation And Installation Manual Manual pdf 10 page image

10104190Blue Flame Vent-Free Natural Gas HeaterCGN20TAIMPORTANT: Hold pressure regulatorwith wrench when connecting it to gas pip-ing and/or fittings.PressureRegulatorTee JointReducerBushing to1/8" NPT1/8" NPTPlug TapTestGaugeConnection*Tee JointPipe NippleCap3/8" NPTPipe NippleFigure 13 - Gas Connection* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptablealternative to test gauge connection. Purchase the optional A.G.A. design-certified manualshutoff valve from your dealer. See Accessories, page 19.HeaterCabinetSedimentTrapManualShutoffValve *3" MinimumTypical InletPipe from GasMeter (4" W.C.to 10.5" W.C.Pressure)Ground Joint UnionCONNECTING TOGAS SUPPLYNOTICE: A qualified service per-son must connect heater to gassupply. Follow all local codes.Typical Inlet Pipe Diameters20,000 Btu/Hr 3/8" or greaterInstallation must include a manual shutoffvalve, union, and plugged 1/8" NPT tap.Locate NPT tap within reach for test gaugehook up. NPT tap must be upstream fromheater (see Figure 13).Install sediment trap in supply line as shownin Figure 13. Locate sediment trap where itis within reach for cleaning. 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: Check gas line pressure be-fore connecting heater to gas line. Gas linepressure must be no greater than 14 inchesof water. If gas line pressure is higher,heater regulator damage could occur.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 largeenough diameter to allow propergas volume to heater. If pipe istoo small, undue loss of pres-sure will occur.CAUTION: Use pipe joint seal-ant that is resistant to liquid pe-troleum (LP) gas.WARNING: Never connectheater to private (non-utility) gaswells. This gas is commonlyknown as well-head gas.Apply pipe joint sealant lightly to malethreads. This will prevent excess sealantfrom going into pipe. Excess sealant in pipecould result in clogged heater valves.