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Gas Ignition Systems

Rooftoop

QuestionAnswer
Standing Pilot functions 1) Burns continuously. 2) Operates as a safety device
Four Types Gas Ignition System 1) Standing Pilot (SP) 2) Intermittent pilot (IP) 3) Direct Spark (DSI) 4) Hot surface Ignition (HIS)
Two type Standing Pilot Aerated pilot- the air is mixed with the gas before entering the pilot burner. Dust can collect at the primary air inlet. Non aerated- Uses only secondary air at the point where combustion occurs. Dust particles burn away.
Standing Pilot Flame Proving Device Three Types 1) Thermocouple or thermopile. 2) Bimetallic strip 3) Liquid filled remote bulb
Thermocouple Two dissimilar metals welded together. Has a hot and cold joint. When heated will generated a 15 mv to 30 mv at the cold junction. Energizes a coil at the gas valve which will keep the pilot lit as long as there is a flame present
Thermocouple Generated Generated current when heated
Bimetal Safety Closes contacts as long as pilot heats the bimetal
Liquid Filled Remote Bulb Heated by the pilot flame, closes contacts
Intermittent Pilot Spark from the ignition Module ignites the pilot which lit’s the main gas burner
Flame Rectification Pilot and Probe Flame sensor, Pilot Flame, and Pilot Hood-negative probe to the ground and sensing circuit
Flame Rectification Verifies a Pilot Flame Pilot flame is ignited, the hot ionized gas in the flame becomes a good conductor of electricity. The increased current flow to ground, it will turn off the spark
Measuring DC Amp of Flame Rectification A micrometer put in series Flame sensor terminal or system ground will measure Flame Rectification
Direct Spark (DSI) Spark Ignition to the main burner or ground strap
Hot Surface Ignition (HIS) Uses silicone carbide that resists current flow
Created by: toolegit
 

 



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