CAC / BDP 7 kW NG Diagnostic Repair Manual
Also see for FOR BYPASS AND FAN POWERED HUMIDIFIERS: Owner's manualOwner's manualOwner's manual
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Contents
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Page 11GENERAL INFORMATION sEctioN 1.2iNstallatioN BasicsintroductionInformation in this section is provided so that theservice technician will have a basic knowledge ofinstallation requirements for home standby systems.Problems that arise are often related to poor or unau-thorized installation practices.A typical home standby electric system is shown inFigure 1 (next page). Installation of such a systemincludes the following:• Selecting a Location• Grounding the generator.• Providing a fuel supply.• Mounting the load center.• Connecting power source and load lines.• Connecting system control wiring.• Post installation tests and adjustments.SelectinG a locationInstall the generator set as close as possible to theelectrical load distribution panel(s) that will be pow-ered by the unit, ensuring that there is proper ventila-tion for cooling air and exhaust gases. This will reducewiring and conduit lengths. Wiring and conduit notonly add to the cost of the installation, but excessivelylong wiring runs can result in a voltage drop.Control system interconnections between the transferswitch and generator consist of N1 and N2, and leads23, 15B and 0. Control system interconnection leadsmust be run in a conduit that is separate from the ACpower leads. Recommended wire gauge size dependson the length of the wire:max. cable length recommended Wire size35 feet (10.67m) No. 16 AWG.60 feet (I8.29m) No. 14 AWG.90 feet (27.43m) No. 12 AWG.GroundinG the GeneratorThe National Electric Code requires that the frameand external electrically conductive parts of the gen-erator be property connected to an approved earthground. Local electrical codes may also require prop-er grounding of the unit. For that purpose, a ground-ing lug is attached to the unit. Grounding may beaccomplished by attaching a stranded copper wire ofthe proper size to the generator grounding lug and toan earth-driven copper or brass grounding-rod (elec-trode). Consult with a local electrician for groundingrequirements in your area.the Fuel SupplyUnits with air-cooled engines were operated, testedand adjusted at the factory using natural gas as afuel. These air-cooled engine units can be convertedto use LP (propane) gas by making a few adjustmentsfor best operation and power.LP (propane) gas is usually supplied as a liquid inpressure tanks. Both the air-cooled and the liquidcooled units require a “vapor withdrawal” type of fuelsupply system when LP (propane) gas is used. Thevapor withdrawal system utilizes the gaseous fuelvapors that form at the top of the supply tank.The pressure at which LP gas is delivered to thegenerator fuel solenoid valve may vary considerably,depending on ambient temperatures. In cold weather,supply pressures may drop to “zero”. In warm weath-er, extremely high gas pressures may be encountered.A primary regulator is required to maintain correct gassupply pressures.Current recommended gaseous fuel pressure at the inletside of the generator fuel solenoid valve is as follows:lP NGMinimum water column 10 inches 5 inchesMaximum water column 12 inches 7 inchesA primary regulator is required to ensure that properfuel supply pressures are maintained.* DaNGEr: lP aND Natural Gas arE BotHHiGHlY EXPlosiVE. GasEous fuEl liNEsmust BE ProPErlY PurGED aND tEstEDfor lEaKs BEforE tHis EQuiPmENt isPlacED iNto sErVicE aND PErioDicallYtHErEaftEr. ProcEDurEs usED iNGasEous fuEl lEaKaGE tEsts mustcomPlY strictlY WitH aPPlicaBlE fuElGas coDEs. Do Not usE flamE or aNYsourcE of HEat to tEst for Gas lEaKs.No Gas lEaKaGE is PErmittED. lP Gas isHEaViEr tHaN air aND tENDs to sEttlE iNloW arEas. Natural Gas is liGHtEr tHaNair aND tENDs to sEttlE iN HiGH PlacEs.EVEN tHE sliGHtEst sParK caN iGNitEtHEsE fuEls aND causE aN EXPlosioN.Use of a flexible length of hose between the genera-tor fuel line connection and rigid fuel lines is required.This will help prevent line breakage that might becaused by vibration or if the generator shifts or settles.The flexible fuel line must be approved for use withgaseous fuels.Flexible fuel line should be kept as straight as possi-ble between connections. The bend radius for flexiblefuel line is nine (9) inches. Exceeding the bend radiuscan cause the fittings to crack.the tranSFer SWitch / load centerA transfer switch is required by electrical code, to pre-vent electrical feedback between the utility and stand-by power sources, and to transfer electrical loads fromone power supply to another safely.TRANSFER SWITCHES:Instructions and information on transfer switches maybe found in Part 3 of this manual.Part 10G9266revA.indd 11 10/15/2008 11:26:19 AM |
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