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DRAFT 09.18.2013 42 Pipe Sizes...................................... 38 thru 1 threaded connections with NPT or ISO7-1 threads. Housing Material.......................... SR400 SR500 SR600 aluminum. Mounting...................................... Mount in an upright position only. NOTE All Maxitrol gas pressure regulators should be installed and operated in accordance with Maxitrol Safety Warning Instructions see SELMMRSR_MI_EN.FR.ES. Certifications................................ SR400 SR500 SR600 ANSI Z21.18CSA 6.3 Gas Appliance Pressure Regulators except suffix -2 models. Gas Types...................................... Suitable for natural manufactured mixed gases liquefied petroleum gases and LP gas-air mixtures. Maximum Inlet Pressure............... CSA Certified 12 psi 3.4 kPa Maxitrol Tested 1 psi 6.9 kPa Flow Rates..................................... up to 1000 CFH 28.32 m3 h Emergency Exposure Limits........... 2.5 psi 17.2 kPa Ambient Temperature Ranges........ -40 to 175F -40 to 79C Minimum Regulation..................... SR400 SR500 5 CFH SR600 60 CFH NOTE SR400-2 SR500-2 SR600-2 models are designed primarily for LP gas applications. NOTE All models may be powered by a 24 volt AC transformer. When the coil is energized the appliance is at low fire. When the coil is de-energized it is high fire. Continuous regulation is maintained to hold the electrically set outlet pressure constant. An ideal replacement for dual manifold systems the SR Series combines gas pressure regulating and flame staging in a single unit. Applications include direct-fired heaters with two speed fans hi-lo control for outdoor heaters LP natural gas switchover and industrial processing. SR400 SR SERIES 2 Stage Design Specifications 2015 Maxitrol Company. All Rights Reserved.