Bosch 250 SXO LP User Manual

Also see for 2400 EO NG: User manual Service bulletin Manual

Contents

6 720 607 44010Appliance details2.8 Gas piping & connectionsBefore connecting the gas supply, check the ratingplate on the right side of the heater to be sure that theheater is rated for the same gas to which it will beconnected.In the United States: The installation must conform withlocal codes or, in the absence of local codes, theNational Fuel Gas Code ANSI Z223.1/NFPA 54.In Canada: The Installation should conform with CGAB149 INSTALLATION CODES and/or local installationcodes.GAS LINE SIZINGThe gas supply piping should be sized according to theapplicable plumbing code for a maximum draw of175,000 BTUH. Measure the length of gas supply lineand use the tables in Fig. 12 or the gas linemanufactures sizing tables to determine the pipediameter necessary to accommodate the BTU demandof the unit. If there are more gas drawing appliances onthe line, size the gas line according to the total maximumamount of BTU draw for all appliances.Note: Under sizing the gas line may result in diminishedoutput and improper operation. See chapter 2.9 for theprocedure to confirm gas pressure.Fig. 11B Install a manual gas shut off valve, on the gas supplyline.B The use of a union when connecting gas pipe to thegas inlet connection is important, this will facilitateany necessary servicing and cleaning of the inlet gasparticle screen.B The minimum diameter required for any applianceconnector used is ¾”.B National Fuel Gas Code requires that a sedimenttrap (drip leg) be installed on gas appliances not soequipped. The drip leg must be accessible and notsubject to freezing conditions. Install in accordancewith the recommendations of the serving gassupplier.The water heater must not be piped with gas supplypressures in excess of 0.5 psig. If overpressure hasoccurred, such as through improper testing of the gaslines or malfunction of the supply system, the gas valvemust be checked for safe operation.When connections are made, check for gas leaks at alljoints. Apply some gas leak detection solution to all gasfittings. Bubbles are a sign of a leak. A CombustibleGas Detector may also be used to detect for leaks.Gas pipingInlet gas particle screenWarning: The heater must be isolatedfrom the gas supply piping systemduring any pressure testing of thatsystem at test pressures equal to ormore than 0.5 psig.Danger: If you have a leak, shut off thegas. Tighten appropriate fittings to stopleak. Turn the gas on and check againwith a gas leak detection solution.Never test for gas leaks using a matchor flame.