2420 38TH ST ROYELL MANUFACTURING 2025-03-27

Heater Suspension Using Field-Supplied Threaded Rods The heater may be suspended from 3/8-inch threaded rods using either two- or four-point suspension. The recommended maximum rod length is 6 feet (1.8 meters).The length of the threaded rod extending into the heater MUST NOT exceed 1/2 inch(13 mm). Ensure that the threaded rods are locked to the heater as shown in Figure 8. x-3/8-INCH THREADED ROD ADD 3/8-INCH NUT AND WASHERTO LOCK ROD TO HEATER Figure 8. Heater Suspension Using Field-Supplied Threaded Rods Piping Connections Gas Supply Pressure The unit is equipped for a maximum gas supply pressure of 1/2 psi, 3.5 kPa, or 14 IN WC. NOTES: Supply pressure higher than 1/2 psi requires the installation of an additional service regulator external to the unit, PRESSURE TESTING SUPPLY PIPING • Test pressures above 1/2 psi—disconnect the heater and manual valve from the gas supply line to be tested. Cap or plug the supply line. • Test pressures below 1/2 psi—before testing,close the manual valve on the heater. Gas Supply Piping DANGER 0 • All components of a gas supply system must be leak tested prior to placing equipment in service. NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal injury, property damage, or death. • Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical constituents of the gas being supplied. • All piping must be in accordance with requirements outlined in the National Fuel Gas Code ANSI/Z223.1 (latest edition) or CSA-13149.1 and B149.2 (refer to Unit Location section). • Gas supply piping installation shall conform with good practice and with local codes. • Support gas piping with pipe hangers, metal strapping, or other suitable material. Do not rely on the heater to support the gas pipe. • The heater is orificed for operation with natural gas having a heating value of 1,050 (±50) BTU per cubic foot or with propane gas having a heating value of 2,500(±100) BTU per cubic foot. Sizing of gas supply lines depends 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 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 the gas at the installation does not meet this specification, consult the factory for proper oriflcing. • Variables for sizing gas supply lines are listed In Table 14.When sizing supply lines,consider possibilities of future expansion and increased requirements. Refer to National Fuel Gas Code for additional information on line sizing. 1-UBX-UBZ-UDX-UDZ(04-21)1034344-0 19