Installation Manual - Unical Lattner Condensing Hot Water Boilers

3.8 - GAS CONNECTIONDANGERThe gas connection must be carried out by aregistered engineer who will have to respectand comply to the regulations in force and tothe requirements indicated by the local gassupplier. An incorrect installation couldcause injury to persons, animals or damageto property. The manufacturer shall not beheld liable for any injury and/or damage.WARNINGLATTNER wall mounted boilers are built to runon Natural Gas or Propane Gas.The gas type the boiler is suitable for isindicated on the packaging label and on thedata plate boiler.First check the identification plate on the boilerfor the suitable gas type.DANGERDo not use the boiler for another type of gasthan indicated on the identification plate of theboiler. This will cause improper functioning andcan damage the boiler.Natural gas: refer to chapter 3.8.1Propane gas: refer to chapter 3.8.2The gas supply connection must comply with localregulations or, if such regulations do not exist,with the National Fuel Gas Code, ANSI Z223.1/NFPA 54.For Canada, the gas connection must comply withlocal regulations or, if such regulations do not exist,with the CAN/CSA-B149.1-05 - Natural Gas andPropane Installation CodeBefore installing the boiler it is recommended tothoroughly clean all the supply piping in order toremove any eventual residual grime which couldcompromise the boilers correct functioning.As a safety measure against gas leaks,LATTNER recommends installing a surveillanceand protective system made up of a gas leakagedetector combined with an on-off selenoid valveon the gas supply line.DANGERAlways check the safety of the gas pipe systemby means of a bubble test using leak-searchspray.The boiler and its individual shut off valve mustbe disconnected from the gas supply piping systemduring any pressure testing of that systemat test pressures in excess of 1/2 PSI (3.5kPa).The boiler must be isolated from the gas supplypiping system by closing its individual manualshutoff valve during any pressure testing of thegas supply piping system at test pressures equalto or less than 1/2 PSI (3.5 kPa).Instructions for the installer3.8.1 - GAS CONNECTION WITH NATURAL GASPipe sizing for natural gas- Contact gas supplier to size the gas supply line and meter.Gas pipingThe boiler gas pipe is equipped with external 3/4" M-NPTthread, onto which the tail piece of the gas shut off valve canbe connected. Use appropriate sealing.The connection to the boiler must include a suitable methodof disconnection and a gas control valve must be installedadjacent to the boiler for isolation purposes. The nominal inletworking gas pressure measured at the boiler should be 7"W.C. (18 mbar) for Natural gas (Gas A).Maximum pressure with no flow (lockup) or with the boilerrunning is 10.5 inches W.C. Minimum pressure with the gasflowing (verify during boiler startup) is 4.0 inches W.C.3.8.2 - GAS CONNECTION WITH PROPANE GASPipe sizing for propane gas- Contact gas supplier to size pipes, tanks, and 100% lockupgas pressure regulator.Propane Supply Pressure Requirements- Adjust propane supply regulator provided by the gas supplierfor 13 inches W.C. maximum pressure.- Pressure required at gas valve inlet pressure port:- Maximum 13 inches W.C. with no flow (lockup) or withboiler running.- Minimum 8 inches W.C. with gas flowing (verify duringboiler startup).Ensure that the high gas pressure regulator is installed atleast 6 to 10 feet upstream of the boiler.Gas piping- Use a gas shut off valve compatible with propane gases.- A sediment trap must be provide upstream of the gas controls.The boiler pipe is provided with external 3/4" M-NPT thread,onto which the tail piece of the gas shut off valve can bescrewed. Use appropriate sealing.The connection to the boiler must include a suitable methodof disconnection.The nominal inlet working gas pressure measured at the boilershould be 11" W.C. (27 mbar) for Propane gas (Gas E).A gas control valve must be installed adjacent to the boiler forisolation purposes. The nominal inlet working gas pressuremeasured at the boiler should be 11 inch W.C. (27 mbar) forPropane gas (Gas E).19