Desa CGN20 Owner's Operation And Installation Manual

Contents

8103568VENT-FREE NATURAL GAS HEATERSBLUE-FLAME CGN20, CGN20L AND RN30DFigure 11 - Installing Bottom MountingScrewsFigure 10 - Mounting Heater OntoMounting BracketINSTALLING TOWALLContinuedMountingBracket(attachedto wall)HorizontalSlotsStand-OutTabCONNECTING TOGAS SUPPLYNOTICE: A qualified service per-son must connect heater to gassupply. Follow all local codes.WARNING: Never connectheater to private (non-utility) gaswells. This gas is commonlyknown as wellhead gas.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.Installation 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 12).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"diameter or greater to allowproper gas volume to heater. Ifpipe is too small, undue loss ofpressure will occur.Typical Inlet Pipe Diameters20,000 Btu/Hr models 3/8" or greater30,000 Btu/Hr models 1/2" or greaterFigure 12 - 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 15.Tee JointReducerBushing to1/8" NPT1/8" NPTPlug TapPressureRegulatorTestGaugeConnection *SedimentTrapTee JointPipe NippleCapHeaterCabinet3/8" NPTPipe NippleNote: Burner bracketnot shown for clarityManual ShutoffValve *Typical InletPipe FromGas Meter(4" W.C. to 10.5"W.C.Pressure)Ground JointUnion3" MinimumPlacing Heater On MountingBracket1. Locate two horizontal slots on backpanel of heater.2. Place heater onto mounting bracket.Slide horizontal slots onto stand-outtabs on mounting bracket.Installing Bottom MountingScrews1. Locate two bottom mounting holes.These holes are near bottom on backpanel of heater (see Figure 11).2. Mark screw locations on wall.3. Remove heater from mounting bracket.4. If installing bottom mounting screwsinto hollow or solid wall, install wallanchors. Follow steps 1 through 4 un-der Attaching To Wall Anchor Method,page 7.If installing bottom mounting screwinto wall stud, drill holes at marked lo-cations using 9/64" drill bit.5. Replace heater onto mounting bracket.6. Place spacers between bottom mount-ing holes and wall anchor or drilledhole.7. Hold spacer in place with one hand.With other hand, insert mounting screwthrough bottom mounting hole andspacer. Place tip of screw in openingof wall anchor or drilled hole.8. Tighten both screws until heater isfirmly secured to wall. Do not overtighten.Note: Do not replace front panel at thistime. Replace front panel after makinggas connections and checking for leaks(see pages 8-9).