Heating Basics â Gas Valve Systems - Robertshaw Thermostats

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Ignition Systems Three Types of Ignition Systems • Standing pilot – Pilot is manually ignited and stays on constantly. When the thermostat calls for heat, and the pilot flame is making good contact with the thermocouple, the gas valve allows gas to flow to main burner until the call for heat is satisfied. Least expensive, least efficient. • Intermittent pilot (also known as “spark to pilot”) – Pilot is ignited by a spark generated by an ignition module and electrode. When enough heat is generated in the thermocouple, the gas valve allows gas to the main burner and is ignited by the pilot until the call for heat is satisfied. More expensive, more efficient. • Direct spark and Hot Surface Ignition (HSI) – When the thermostat calls for heat, the main burner is ignited by a direct spark or ceramic (glow bar) igniter. Eliminates the pilot, but requires flame sensor and more expensive ignition module. Most expensive, most efficient.
Acronyms GRD = Ground IGN = Ignition LP = Liquid Propane MV = Main Valve NO = Normally Open NC = Normally Closed PV = Pilot Valve V AC = Voltage Alternating Current V DC = Voltage Direct Current
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 and 20: Additional Gas Valve Characteristic
Page 21 and 22: Additional Gas Valve Characteristic
Page 23 and 24: Snap-Action And Snap-Throttle Hydra
Page 25: Ignition Control Systems • Standi
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