DUNGS FRG - Ratio Regulator & Zero Governor (US/CA)

[{"filename":"frg_datasheet_us_226363.pdf","text":"Ratio Regulator\n Zero Governor\n\n FRG/6 Series\n\n\n\n\n CSA Certified\n • ANSI Z21.18 / CSA 6.3\n • CSA Requirement # 5.01\n • Zero Governor and Gas/Air\n Regulator\n • File # 157406\n\n US and Canadian Models\n • FRG 705/6\n • FRG 707/6\n • FRG 710/6\n • FRG 712/6\n • FRG 715/6\n • FRG 720/6\n • FRG 725/6\n • FRG 730/6\n • 1/2 in. NPT - 3 in. NPT\n\n Commonwealth of Massachusetts\n Approved Product\n • Approval code G3-0106-191\n • Commerical / Industrial Gas\n Regulator\n\n Codes and Standards Description Application (General)\n This product is intended for instal- The FRG ratio regulator/zero governor The FRG is recommended for industrial\n lations covered by but not limited to has an adjustable setpoint spring and and commercial heating applications. It\n NFPA 86, ANSI Z83.4, ANSI Z83.18, nonadjustable counterspring. is suitable for dry natural gas, propane,\n ANSI Z21.13, UL 795, CSD-1, - Optional Low fire bypass for ½ in. butane, air and inert gases. Suitable for\n CSA B149.1, CSA B149.3 and NPT to 2 in. NPT models. Ideal for low up to 0.1 % by volume, dry H2S.\n CSA B149.6. flow or for high turndown applications.\n - Steady, precise and instantaneous Application (Ratio Regulator)\n regulation of the outlet pressure. Holds a constant gas/air ratio during\n\n\n\n\n FRG/6 Sales Brochure • Nr. 226363 • Edition 2025.05\n DUNGS is an ISO 9001\n manufacturing facility. - Connection for air impulse line. turndown by varying gas flow to the\n - Inlet and outlet ¼ in. NPT test ports burner in proportion to combustion air\n on each side. flow. Adjustable ratio for excess gas or\n - Factory installed vent limiter. Review air operation.\n applicable codes for vent line require-\n ments. Application (Zero Governor)\n Controls fuel by reducing incoming gas\n pressure to zero or adjustable to slightly\n above or below atmospheric pressure.\n\n\n1…8\n\fFRG/6 Spring-loaded ratio regulator/zero governor with adjustable setpoint spring and defined counterspring. Internal\nsensing of output pressure; air impluse line connection is standard.\n\nSpecifications\nPipe thread (NPT) 1/2\" 3/4\" 1\" 1 ¼\" 1 ½\" 2\" 2 ½\" 3\"\nMax. operating pressure 7 PSI (500 mbar) Factory Rating; 5 PSI (350mbar) CSA Certified\nMax. body pressure 15 PSI (1000 mbar)\nOptimal inlet pressure range Ratio regulator = 3 to 82 in. W.C. (7 to 200 mbar)\n Zero Governor = 3 to 20 in. W.C. (7 to 50 mbar) with 10:1 turndown\n Zero Governor = 3 to 82 in. W.C. (7 to 200 mbar) with 3:1 turndown\nOutput pressure range Ratio regulator output = 0 to 60 in. W.C. (0 mbar to 150 mbar)\n Zero Governor output= -2 to 1 in. W.C. (-5 mbar to 3 mbar)\nMaterials in contact with gas Housing: Aluminium\n Seals and diaphragms: NBR\nAmbient / Fluid Temperature -20 °F to +160 °F\nInstallation position Regulator dome vertically upright or horizontally.\nTest ports / Pilot gas connections ¼ in. NPT on both sides of the inlet section and ¼ in. NPT on both sides of the outlet\n section. Taps/connections only on one side when low fire bypass is used.\nLow fire Bypass (Optional) Field mountable low fire bypass: ½ in. NPT to 2 in. NPT on either side of\n housing.\nVent line connection / air impulse line • The vent line connection/air impulse line connection is G ¼“ for FRG‘s up\nconnection / vent limiter to 1“ NPT, and it is G ½“ for FRG‘s 1 ¼ to 3“ NPT. A G thread to NPT thread\n field mountable adapter is available.\n • For gas/air ratio applications at pressure ratio of approximately 1:1, use the\n existing connection as pressure connection for air impulse line / blower\n pressure, and at low fire, the air impulse line pressure shall be between 0.2\n to 1.0 in WC.\n • The FRG/6 also has a factory installed vent limiting device, which limits the\n escape of gas to less than 0.5 CFH @ 5 PSI in case atmospheric diaphragm\n ruptures. Venting required unless otherwise accepted by the authority having\n jurisdication.\nHysterisis +/- 10%\n\n\n\nPressure taps\nPulse and blower connection\n\n1 Breathing plug/vent line conection\n for zero governor applications or\n connection for an air impulse line\n for ratio regulator applications.\n\n2 Pressure connection in inlet section,\n both sides ¼ in. NPT.\n\n3 Pressure connection in outlet sec-\n tion, both sides ¼ in. NPT.\n\nLow fire bypass option can be mounted\non either side of valves (½\" - 2\").\n\n\n Low fire bypass\n option for\n FRG 705/6 - 720/6.\n P/N 225256\n\n\n 2…8\n\f Dimensions inch (mm)\n\n\n\n NPT Field mountable adapter\n\n\n\n\n f Replacement Spring Clearance\n for air impulse line\n G 1/4 to 1/4“ NPT Part # 231944\n G 1/2 to 1/2“ NPT Part # 231945\n\n\n\n\n Size Upstream Port 1/4\" NPT\n Downstream Port 1/4\" NPT\n\n\n\n\n Type Order No. Pressuremax. Size Dimensions [inch] Weight [lbs]\n [PSI] Dimensions [mm] [kg]\n a b c d e f\n FRG 705/6 226458 7 NPT 1/2 2.9 4.5 0.9 5.6 G 1/4 8.9 1.3\n 75 115 24 143 225 0.6\n FRG 707/6 226459 7 NPT 3/4 3.9 5.1 1.1 6.5 G 1/4 9.6 2.2\n 100 130 28 165 245 1.0\n FRG 710/6 226460 7 NPT 1 4.3 5.7 1.3 7.5 G 1/4 12.2 2.6\n 110 145 6 190 310 1.2\n FRG 712/6 226461 7 NPT 1 1/4 5.9 7.7 1.6 9.8 G 1/2 14.2 5.9\n 150 195 40 250 365 2.7\n FRG 715/6 226462 7 NPT 1 1/2 5.9 7.7 1.6 9.8 G 1/2 14.2 5.5\n 150…