Heating Basics â Gas Valve Systems - Robertshaw Thermostats

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Combination Gas Valves Combination valves include three components • Regulation • Safety valve • Main valve actuated by thermostat or bulb
Additional Gas Valve Characteristics Robertshaw® Gas Valve Opening Characteristics LEGEND 450,000 OPENING CHARACTERISTICS 400,000 350,000 STANDARD OPEN BTU 300,000 250,000 200,000 150,000 100,000 Standard Open Slow Open Step Open instant full flow SLOW OPEN S7A = 0 - 5 sec. to full flow 50,000 0 0 1 5 10 15 20 25 30 35 40 S7B = 5 - 10 sec. to full flow S7C = 10 - 30 sec. to full flow Time (s) STEP OPEN SO1 = 30% of full flow SO2 = 40% of full flow SO3 = 50% of full flow SO4 = 60% of full flow
Page 1 and 2: Heating Basics - Gas Valve Systems
Page 3 and 4: Acronyms BTU = British Thermal Unit
Page 5 and 6: Fuel Characteristics of British The
Page 7 and 8: NFPA 54 National Fuel Gas Code •
Page 9 and 10: Central Heating Applications Factor
Page 11 and 12: Commercial Water Heating Applicatio
Page 13 and 14: Residential Water Heating Applicati
Page 15 and 16: Millivolt Actuated Gas Valve Wall T
Page 17 and 18: 24 Volt Actuated - Standing Pilot S
Page 19: Additional Gas Valve Characteristic
Page 23 and 24: Snap-Action And Snap-Throttle Hydra
Page 25 and 26: Ignition Control Systems • Standi
Page 27 and 28: Acronyms GRD = Ground IGN = Ignitio
Page 29 and 30: Gases Used In Applications • Liqu
Page 31 and 32: Feature List for Ignition Controls
Page 33 and 34: Intermittent Pilot Checkout Procedu
Page 35 and 36: Hot Surface Ignition (HSI) ROBERTSH
Page 37 and 38: Hot Surface Terminology • Pre-Pur
Page 39 and 40: Hot Surface Sequence of Operation
Page 41 and 42: Flame Rectification AC CURRENT Flam
Page 43 and 44: Hot Surface Igniters • Hot Surfac
Page 45 and 46: Pilot Basics
Page 47 and 48: Proper Pilot Flame Correct Fl
Page 49 and 50: Thermocouple Parts • The 1980 ser
Page 51 and 52: Thermopile Basics Hot Junctions Col
Page 53 and 54: Gas Valve Installation Tips Determi
Page 55 and 56: Troubleshooting Tips for Gas System
Page 57 and 58: Troubleshooting Tips Problem # 1: H
Page 59 and 60: Troubleshooting Tips Problem # 3: M
Page 61 and 62: Website Tools: www.Uni-Line.com Ent

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Heating Basics â Gas Valve Systems - Robertshaw Thermostats