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ADD 3/8-INCI <br />NUT AND <br />WASHER TO <br />LOCK ROD <br />TO HEATER <br />Figure 8. Heater Suspension Using Field -Supplied Threaded Rods <br />Piping Connections <br />Gas Supply Pressure <br />The unit is equipped for a maximum gas supply pressure of 1/2 psi, 3.5 kPa, or 14 IN WC. <br />NOTES: <br />Supply pressure higher than 1/2 psi requires the installation of an additional service regulator <br />external to the unit. <br />PRESSURE TESTING SUPPLY PIPING <br />• Test pressures above 1/2 psi —disconnect the heater and manual valve from the gas supply line <br />to be tested. Cap or plug the supply line. <br />• Test pressures below 112 psi —before testing, close the manual valve on the heater. <br />Gas Supply Piping <br />• All components of a gas supply system must be leak tested prior to placing equipment in service. <br />NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal <br />injury, property damage, or death. <br />• Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or <br />any other chemical constituents of the gas being supplied. <br />• All piping must be in accordance with requirements outlined in the National Fuel Gas Code ANSI/Z223.1 (latest <br />edition) or the Natural Gas and Propane Installation Code CSA-6149.1 (refer to Installation Codes section). <br />• Gas supply piping installation shall conform with good practice and with local codes. <br />• Support gas piping with pipe hangers, metal strapping, or other suitable material. Do not rely on the heater to <br />support the gas pipe. <br />• The heater is orificed for operation with natural gas having a heating value of 1,050 (±50) BTU per cubic foot or <br />with propane gas having a heating value of 2,550 (-±-100) BTU per cubic foot. Sizing of gas supply lines depends <br />on piping capacity and is based on cubic feet per hour based on a 0.3 IN WC pressure drop, a 0.6 specific gravity <br />for natural gas at 1,050 BTU per cubic feet, and a 1.6 specific gravity for propane at 2,550 BTU per cubic feet. If <br />the gas at the installation does ncZ' meet this specification, consult the factory for proper orificing. <br />• Variables for sizing gas supply lines are listed in Table 15. When sizing supply lines, consider possibilities of future <br />expansion and increased requirements. Refer to National Fuel Gas Code for additional information on fine sizing. <br />UBX-UBZ-UDX-UDZ-IOM (12-22) 1034344-1 19 <br />